Noncontact measurement of in-plane displacement under high ternperature conditions

The digital speckle correlation method was used to achieve fast and high-precision measurement of in-plane displacement under high temperature conditions. A plane array 532 nm laser used as the light source and an optical processing system which is composed of a 532 nm narrow band filter and an adjustable attenuator were a good solution to the imaging problem in this high-temperature case. An artificial speckle making method was described. In this method, high temperature ink resisting about 1000℃ was used as the speckle material, the artificial speckle under this situation was clear and good to image correlation calculation. An in-plane displacement detection system was built under high temperature conditions, micrometer moving displacement detection tests were carried out under different brightness values at room temperature, and thermal deformation field measurement tests of steel locally heated continuously to 1000℃ by blowtorch was also made. Test results show that the system can be used for the measurement of object displacement or deformation field at room temperature and high temperature conditions with the advantages of strong anti-jamming capability, high accuracy, and easy realizing.