Opto-mechanical design and performance test of infrared channel field radiometer

Fig. 2. Schematic diagram of combined optical path

Fig. 3. Optical system of ICFR

Fig. 4. Diffuse spots of optical system of ICFR

Fig. 5. Schematic diagram of ICFR optical head structure

Fig. 6. Light barrel structure diagram of ICFR

Fig. 7. Radiance calibration curve of the ICFR four channels

Fig. 8. Schematic diagram of thermal shock resistance measuring device

Fig. 9. Temperature setting of Peltier

Fig. 10. Difference between ICRF measured blackbody temperature and set temperature under thermal shock

Fig. 11. Working environment temperature suitability test device of ICFR

Fig. 12. Result of ICFR measures the brightness temperature of the reference plate and Platinum resistance measures the physical temperature of the reference plate

Fig. 13. Field comparison experiment

Fig. 14. Comparison of the surface brightness temperature data obtained by the corresponding channels of ICFR and CE312

Table 1. Technical indicators of ICFR

Table 1. Technical indicators of ICFR

Parameters	Values
Wavelength/μm	8-14, 8.2-9.2, 10.3-11.3, 11.5-12.5
Field of view/(°)	10
Ambient temperature/℃	−20-50
Temperature resolution/K	0.01
Uncertainty of radiometric calibration/K	0.16

Table 2. Lens characteristics of ICFR
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Table 2. Lens characteristics of ICFR
Lens Focal length/mm Effective diameter/mm
Objective lens 25.4 5.6
Field lens 3.23 4.35

Table 3. Characteristics of ST60 TO-5

Table 3. Characteristics of ST60 TO-5

Parameters	Values
Active area size/mm	0.61×0.61
Number of junctions	80
Signal-to-noise ratio/Hz^1/2	4792
Responsivity/V·W⁻¹	105.9
Resistance/kΩ	105.9
Temperature coefficient of R/℃	0.11%
Noise voltage/nV·Hz^1/2	33.8
Noise equivalent powe/nW·Hz^1/2	0.52
Detectivity/cm⁻¹·Hz^1/2·W⁻¹	2.38×10⁸
Time constant/ms	18
Field of view/(°)	81
Germanium window with nonreflective coating/μm	8–14

Table 4. Performance parameters of CES100-06 blackbody

Table 4. Performance parameters of CES100-06 blackbody

Parameter	Value
Radiation area/mm²	250×250
Temperature range/℃	−50-100
Uniformity	±0.03% thereafter within central 80%
Temperature control accuracy/℃	±0.03, 0-100 ±0.05, −50-0
Emissivity	0.992±0.001
Controller size/mm	133.35×482.6×457.2
Voltage VAC	100-240±10% （50/60 Hz）

Table 5. Values of the parameters fitting the ICFR channels
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Table 5. Values of the parameters fitting the ICFR channels
Channel/μm a_i b_i n_i d_i
8-14 989.14228 1303.31397 0.98601 3.29853
8.2-9.2 2724.55731 1629.11314 0.99239 1.73586
10.3-11.3 781.95613 1307.12426 0.9978 1.02869
11.5-12.5 452.36975 1153.00413 0.99486 0.98921

Table 6. Combined uncertain of radiometric calibration