SI-111 Precision Infrared Radiometer Revision: 7/13 C o p y r i g h t © 2 0 0 2 - 2 0 1 3 C a m p b e l l S c i e n t i f i c , I n c . , A p o g e e I n s t r u m e n t s , I n c .
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Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. General Description....................................................1 2. Specifications .............................................................1 3. Installation ...................................................................2 4. Wiring...........................................................................3 5. Example Programs .
SI-111 Precision Infrared Radiometer NOTE 1. Prior to November 2008, the SI-111 was named the IRR-P. Only the name changed. General Description The SI-111 is an infrared temperature sensor that provides a non-contact means of measuring the surface temperature of an object. It senses the infrared radiation being emitted by the target. The SI-111 can be widely used for measurements of leaf, canopy, and average surface temperature.
SI-111 Precision Infrared Radiometer 3. Installation The field of view for infrared sensors is calculated based on the geometry of the sensor and lens. However, optical and atmospheric scatter and unwanted reflections from outside the field of view may influence the measurement. Under typical conditions, 95 to 98 percent of the IR signal is from the field of view and 2 to 5 percent is from the area surrounding the field of view.
SI-111 Precision Infrared Radiometer 4. Wiring Target Temperature: Red Differential High Black Differential Low Clear Analog Ground Sensor Body Temperature: Green Single-Ended 5. Blue Analog Ground White Voltage Excitation Example Programs The example datalogger programs measure the SI-111’s thermistor to obtain the SI-111 sensor body temperature and measure the SI-111’s thermopile to obtain the target-to-sensor body temperature difference.
SI-111 Precision Infrared Radiometer 5.1 CR1000 Example Program This example CR1000 program measures the sensor every 5 seconds and outputs a sample once every 60 seconds. The actual measurement rate and output intervals need to be adjusted for the actual installation and application.
SI-111 Precision Infrared Radiometer 'Instruction to measure mV output of thermopile detector (red wire to 2H, black wire to 2L, clear ‘wire to ground) VoltDiff (TargmV,1,mV2_5,2,True ,0,_60Hz,1.0,0) 'Calculation of m (slope) and b (intercept) coefficients for target temperature calculation m = mC2 * SBTempC^2 + mC1 * SBTempC + mC0 b = bC2 * SBTempC^2 + bC1 * SBTempC + bC0 'Calculation of target temperature SBTempK = SBTempC + 273.15 TargTempK = ((SBTempK^4) + m * TargmV + b)^0.
SI-111 Precision Infrared Radiometer ;{CR10X} *Table 1 Program 01: 1 Execution Interval (seconds) ;Instruction string to measure the resistance of the thermistor and calculate the sensor body ;temperature. See the Instruction Manual for Campbell Scientific Model 109 Temperature Probe for ;details.
SI-111 Precision Infrared Radiometer 9: Z=X+F (P34) 1: 8 2: -273.15 3: 9 X Loc [ SB_Temp_K ] F Z Loc [ SB_Temp_C ] ;Instruction to measure the mV output of the thermopile. 10: Volt (Diff) (P2) 1: 1 Reps 2: 21 2.5 mV 60 Hz Rejection Range 3: 2 DIFF Channel 4: 11 Loc [ mV_tpile ] 5: 1.0 Mult 6: 0.0 Offset ;Calculation of m (slope) coefficient for target temperature calculation. Each sensor has unique ;C0, C1, and C2 values.
SI-111 Precision Infrared Radiometer ;Target temperature calculation based on m and b coefficients. 15: Z=F x 10^n (P30) 1: 0.4 F 2: 1 n, Exponent of 10 3: 14 Z Loc [ Exponent1 ] 16: Z=F x 10^n (P30) 1: 0.
SI-111 Precision Infrared Radiometer *Table 2 Program 02: 0.0 Execution Interval (seconds) *Table 3 Subroutines End Program 6. Maintenance A primary source of inaccurate measurements for any radiation sensor is blocking of the optical path to the detector. The window in the Apogee’s infrared sensor is inset and protected, but it can become partially blocked in three ways: 1. Spiders can make a nest in the entrance.
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