Dr. Jinyuan Liu Profile

Dr. Jinyuan Liu

at National Institute of Metrology

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Proceedings Article | 18 December 2019 Paper

Analysis and suppression of stray radiation in infrared spectral radiation measurement

Shufang He, Yanfei Wang, Caihong Dai, Jinyuan Liu, Guojin Feng

Proceedings Volume 11337, 1133704 (2019) https://doi.org/10.1117/12.2540466

KEYWORDS: Infrared radiation, Optical simulations, FT-IR spectroscopy

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The absolute measurements of spectral radiance, irradiance and intensity in infrared wave range are very important for infrared target recognition, material emissivity measurement and so on. Recently, many researchers focus on how to accurately measure absolute infrared spectral radiation, in which one key point is how to suppress stray radiation. In this paper, an absolute infrared spectral radiance measurement system was built up. The system contained a fixed-point blackbody source, a variable temperature blackbody source, a radiant source to be measured, Fourier Transform Infrared Radiometer (FTIR), optical system, non-contact infrared thermometer and so on. Emissivities of the standard source and the radiant source to be measured are 0.999 and 0.995, respectively. According to Planck’s law, their absolute spectral radiance should be similar at the same radiation temperature. In experiment, temperatures of the standard blackbody and radiant source to be measured were set to 500°C, and the FTIR was used to measure spectral radiance. The results show spectral radiance of the standard source is 14.9% smaller than the radiant source to be measured at 10μm wavelength. A thermal infrared imager and optical simulation software were used to analyze the possible reasons. To solve the problems, a shielding plate and a field aperture was installed respectively at the entrance of the optical system and before the FTIR to suppress stray radiation. Moreover, sizes and positions of the shielding plate, optical system, and field aperture were analyzed by optical simulation software and mathematical calculation. After optimization, the experimental results show the difference of spectral distributions between the standard source and the radiant source to be measured is only 1.42% at 10 μm wavelength, suggesting stray radiation is effectively suppressed in the system.

Proceedings Article | 18 November 2019 Paper

System construction and uncertainty evaluation of absolute measurement of infrared spectral radiance

Shufang He, Yanfei Wang, Caihong Dai, Jinyuan Liu, Guojin Feng

Proceedings Volume 11189, 111891A (2019) https://doi.org/10.1117/12.2537206

KEYWORDS: Infrared radiation, FT-IR spectroscopy, Radiometry, Optical metrology

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The absolute measurement of infrared spectral radiance is very important for optical radiometry. In this paper, a system for absolute measurement of infrared spectral radiance is built up. The system consists of fixed-point blackbody sources, a variable temperature blackbody, a radiant source to be measured, Fourier Transform Infrared Radiometer (FTIR), relay optical system, non-contact infrared thermometer and so on. The emissivity of the variable temperature blackbody is 0.999; the temperature range is 50°C ~ 1050°C. The emissivity of the radiant source to be measured is larger than 0.995; the temperature range is 30°C ~ 550°C. The variable temperature blackbody source was calibrated and can be traced to the fixed-point blackbody source. In experiment, it was used as the standard radiant source. The spectral range of this system is 3 μm ~ 14 μm. A serial of experiments have been implemented to analyze the uncertainty of each component, including the repeatability, size-of-source effect, stability, uniformity and so on. To improve the system’s uncertainty, we have suppressed stray radiation and optimized optical system by installing a water-cooled aperture and a field stop at the entrance of the optical system and before the FTIR, respectively; optimizing the system based on optical simulation and replacing the reflective mirrors with one off-axis parabolic mirror. Next step, we will re-evaluate the uncertainty of the improved system.

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