Acta Optica Sinica, Volume. 42, Issue 7, 0712004(2022)
Three-Dimensional Temperature Field Measurement Based on Multi-Step Phase Shift Method and Polarization Interference Optical Tomography Optical Path
The precision measurement of the temperature field is of great significance in many fields, such as machinery, aerospace, biomedicine, food and chemical engineering, electric power, energy, and environment. A three-dimensional temperature field measurement method based on multi-step phase shift method and polarization interference optical tomography optical path is proposed. First, the polarization interference optical tomography measurement system is designed by combining the Mach-Zehnder interference optical path structure and optical tomography technology, and the multi-step phase shift is realized by using the rotation of the polarization device to achieve high-precision signal detection. Then, the three-dimensional refractive index distribution of the measured medium is restored by the exponential filtering backprojection algorithm, and the three-dimensional temperature field distribution is obtained. Finally, the measurement formulae are derived and the experimental system is built. The error analysis shows that the system measurement uncertainty is about 0.8 ℃ under the existing experimental conditions. The measurement experiment and comparison results show that the measured temperature field is consistent with the actual situation, and the result is less than 2 ℃ compared with the calibration temperature of the platinum resistance thermometer.
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Qianghua Chen, Sheng Zhou, Jinhong Ding, Wenyuan Han, Xiangyue Kong, Huifu Luo. Three-Dimensional Temperature Field Measurement Based on Multi-Step Phase Shift Method and Polarization Interference Optical Tomography Optical Path[J]. Acta Optica Sinica, 2022, 42(7): 0712004
Category: Instrumentation, Measurement and Metrology
Received: Sep. 6, 2021
Accepted: Oct. 18, 2021
Published Online: Mar. 28, 2022
The Author Email: Chen Qianghua (chenqianghua@tsinghua.org.cn)