Apogee SI-411 Gebruikershandleiding - Pagina 11

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Apogee SI-411 Gebruikershandleiding
Sensor Calibration
Apogee SI series infrared radiometers are calibrated in a temperature controlled chamber that houses a custom-
built blackbody cone (target) for the radiation source. During calibration, infrared radiometers (detectors) are held
in a fixture at the opening of the blackbody cone, but are thermally insulated from the cone. Detector and target
temperature are controlled independently. At each calibration set point, detectors are held at a constant
temperature while the blackbody cone is controlled at temperatures below (12 C), above (18 C), and equal to the
detector temperature. The range of detector temperatures is -15 C to 45 C (set points at 10 C increments). Data
are collected at each detector temperature set point, after detectors and target reach constant temperatures.
All Apogee SDI-12 infrared radiometer models (SI-400 series) have sensor-specific calibration coefficients
determined during the custom calibration process. Coefficients are programmed into the microcontroller at the
factory. Calibration data for each sensor are provided on a calibration certificate (example shown on following
page).
Calibration overview data are listed in box in upper left-hand corner, temperature errors are shown in graph, and
calibration date is listed below descriptions of calibration procedure and traceability.