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Improved monochromatic pyrometry for synchronous measurement of full-field temperature and deformation

Science China(Technological Sciences) 2021年第9期64卷 2033-2046页

作者： ZHANG JinSong YUE MengKun WANG JinYang TANG YunLong JIANG JinSong GUI YeWei FENG Xue Key Laboratory of Applied Mechanics Department of Engineering MechanicsTsinghua UniversityBeijing 100084China Center for Advanced Mechanics and Materials Tsinghua UniversityBeijing 100084China School of Engineering and Technology China University of GeosciencesBeijing 100083China Chengdu Aircraft Design and Research Institute Chengdu 610041China China Aerodynamics Research and Development Center Mianyang 621000China

Measuring the temperature and deformation synchronously at elevated temperatures is technically challenging and has become a major concern in the evaluation of mechanical properties. In this study, a simple, easy-to-implement, yet effective monochromatic pyrometry is established for non-contact and full-field temperature measurements, which can significantly reduce the error caused by the camera’s channel crosstalk that commonly occurs in the existing improved two-color method. In addition, hightemperature digital image correlation, combined with band-pass filtering and monochromatic illumination, is applied for deformation measurement. Subsequently, an experimental system was set up to validate the accuracy of the proposed method,which consists of a CCD camera for image capturing, a blue bandpass filter for radiation suppression, blue light irradiation for light compensation, and an infrared pyrometer for temperature recording. The results of the thermal heating experiment on the C/SiC sample proved that the selection of camera channel R in monochromatic pyrometry can reduce the error by channel crosstalk,and the proposed method is applicable for synchronous measurement of temperature and deformation.

关键词： synchronous measurement monochromatic pyrometry high-temperature dic

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