Schelt Technology

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.

Above: Spectral response of SI series infrared radiometers. Spectralresponse (green line) is determined by the germanium filter andcorresponds closely to the atmospheric window of 8 to 14 μm,minimizing interference from atmospheric absorption/emission bands(blue line) below 8 μm and above 14 μm. Typical terrestrial surfaceshave temperatures that yield maximum radiation emission within theatmospheric window, as shown by the blackbody curve for a radiatorat 25 C (red line).

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensityof radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 μm).Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperaturewithout touching the surface (when using sensors that must be in contact with the surface, it can be difficult tomaintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infraredthermometers because temperature is the desired quantity, even though the sensors detect radiation.Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant waterstatus estimation, road surface temperature measurement for determination of icing conditions, and terrestrialsurface (soil, vegetation, water, snow) temperature measurement in energy balance studies.Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precisionthermistor (for detector reference temperature measurement), and signal processing circuitry mounted in ananodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers alsocome with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of theradiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designedfor continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detectoris related to the temperature difference between the two.