Sijia Huang, Yinlin Yuan, Wenchao Zhai, Xiaobing Zheng, Zhenggang Lei, Yu Lin. Performance evaluation of noise equivalent spectral radiance calibration system[J]. Infrared and Laser Engineering, 2022, 51(12): 20220509
- Infrared and Laser Engineering
- Vol. 51, Issue 12, 20220509 (2022)
Fig. 1. Flow chart of NESR calibration
Fig. 2. Diagram of an infrared remote sensor NESR calibration system
Fig. 3. Uncertainty of spectral radiance of standard blackbody
Fig. 4. Schematic diagram of calibration optical path
Fig. 5. (a) Fourier transform spectrometer output changing with the rotation angle of reflector when observing standard blackbody @T =303 K, λ= 10 μm; (b) Uncertainty u 2(λ ) due to angle repeatability of rotating mirror
Fig. 6. (a) Fourier transform spectrometer observation of output signal of infrared integrating sphere changing with the rotation angle of reflector, T =153 K, λ= 10 μm; (b) The uncertainty u 3(λ ) affected by angle repeatability of rotating mirror
Fig. 7. (a) Temperature curve of calibration period; (b) Uncertainty u 4(λ ) effected by the background radiation
Fig. 8. (a) Response curve of standard low temperature blackbody (300 K) measured by Fourier transform spectrometer; (b) Repeatability measurement results u 5(λ )
Fig. 9. (a) Output signal of primary integrating sphere tested by Fourier spectrometer; (b) Repeatability of primary integrating sphere u 6(λ )
Fig. 10. (a) Average of Fourier spectrometer output signal; (b) Instability u 8(λ )
Fig. 11. Relative radiance of primary integrating sphere during 30 min
Fig. 12. Surface uniformity measurement result of primary integrating sphere
Fig. 13. Relative spectral radiance of primary integrating sphere changed with measurement angle
Fig. 14. (a) Measurement result of L 1(λ ) and L 2(λ ) ; (b) SNR of Fourier spectrometer
Fig. 15. (a) Calibration result of NESR; (b) Uncertainty of NESR
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Table 1. Measuring instruments of spectral radiance calibration uncertainty
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Table 2. The uncertainty scale of NESR@10 μm calibration
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