Apogee MI-210 Manual del usuario - Página 4
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INTRODUCTION
All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensity of
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 temperature without
touching the surface (when using sensors that must be in contact with the surface, it can be difficult to maintain thermal
equilibrium without altering surface temperature). Infrared radiometers are often called infrared thermometers 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 water status
estimation, road surface temperature measurement for determination of icing conditions, and terrestrial surface (soil,
vegetation, water, snow) temperature measurement in energy balance studies.
Apogee Instruments MI series infrared meters consist of a handheld meter and a dedicated infrared radiometer, which
includes a thermopile detector, germanium filter, precision thermistor (for detector reference temperature measurement),
and signal processing circuitry mounted in an anodized aluminum housing. All infrared meters also come 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 the radiometer closer to the target temperature.
The separate sensors are potted solid with no internal air space and are designed for continuous temperature measurement
of terrestrial surfaces in indoor and outdoor environments. The meters provide a real-time temperature reading on the LCD
display and come equipped with manual and automatic data logging features for making spot-check measurements or
monitoring temperature over time.