US 12,253,417 B2
Multi-wavelength spectral thermometry based on mobile narrow-band window and optimization
Kuangyu Li, Jiangsu (CN); Han Guo, Jiangsu (CN); Huaichun Zhou, Jiangsu (CN); Bo Yu, Jiangsu (CN); Xianyong Peng, Jiangsu (CN); Zhuoran Jing, Jiangsu (CN); and Kun Yang, Jiangsu (CN)
Assigned to China University of Mining and Technology, Jiangsu (CN)
Appl. No. 18/563,877
Filed by China University of Mining and Technology, Jiangsu (CN)
PCT Filed Dec. 23, 2022, PCT No. PCT/CN2022/141254
§ 371(c)(1), (2) Date Nov. 23, 2023,
PCT Pub. No. WO2024/098523, PCT Pub. Date May 16, 2024.
Claims priority of application No. 202211646850.X (CN), filed on Dec. 21, 2022.
Prior Publication US 2024/0418574 A1, Dec. 19, 2024
Int. Cl. G01J 5/48 (2022.01); G01J 5/53 (2022.01)
CPC G01J 5/48 (2013.01) [G01J 5/53 (2022.01)] 4 Claims
OG exemplary drawing
 
1. A multi-wavelength spectral thermometry based on mobile narrow-band window and optimization, comprising the following steps:
(1) collecting a continuous spectrum signal of a thermal radiation object by a spectrometer;
(2) performing radiation calibration on the spectrometer by taking a black-body furnace as a standard radiation source, collecting a relative spectral radiation intensity of a radiation object to be measured at each wavelength, and calculating a corresponding original spectral radiation intensity;
(3) denoising, windowing and standardizing the original spectral radiation intensity;
(4) calculating a temperature and an emissivity of the thermal radiation object; and
(5) determining a concentration of the thermal radiation object according to the emissivity of the thermal radiation object,
wherein in step (1), the collected relative spectral radiation intensity Irel is expressed as:

OG Complex Work Unit Math
in the formula, ADC is an electrical signal collected by the spectrometer, τ is a set exposure time during collection, λi is a central wavelength of a spectrum signal that can be received by each signal channel of the spectrometer, and m is the number of signal channels,
wherein in step (2), the emissivity of the black-body furnace is taken as 1, and the spectrometer collects a relative spectral radiation intensity Ib, rel of the black-body furnace at different temperatures, expressed as:

OG Complex Work Unit Math
in the formula, Tb,j is a set value of the temperature of the black-body furnace, and n represents a set number of the temperatures; and
the spectral radiation intensity Ib of the black-body furnace at a set temperature Tb,j is calculated by the following formula:

OG Complex Work Unit Math
wherein c1 and c2 are constants,
wherein in step (2), a method for calculating the corresponding original spectral radiation intensity is to express a relationship between the spectral radiation intensity I(λi, Tb,j) and the relative spectral radiation intensity Irel(λi, Tb,j) by the following formula:

OG Complex Work Unit Math
in the formula, p is a polynomial order; for the same signal channel, the spectral radiation intensity Ib(λi, Tj) and the relative spectral radiation intensity Ib, rel(λi, Tj) of the black-body furnace at different temperatures are brought into the formula (4), replacing I(λi, Tb,j) and Irel(λi, Tb,j), respectively, and an undetermined coefficient α corresponding to the signal channel is obtained through least square fitting; and the collected relative spectral radiation intensity Irel(λi, Tb,j) of the thermal radiation object to be measured at each wavelength is brought into the formula 4 to calculate the corresponding original spectral radiation intensity Iraw(λi, Tb,j).