Apogee MI-220 Manuale d'uso - Pagina 4

Sfoglia online o scarica il pdf Manuale d'uso per Strumenti di misura Apogee MI-220. Apogee MI-220 16. Mi series infrared temperature meter

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.