Application No./Patent No.: 201610255636X Application date: April 21, 2016.
Inventor/Designer: Feng Aixin, Zhang Jinchao, Xue Wei, Zhao Ying, Yang Haihua, Cheng Hao, Miao Yinan.
The invention discloses a rail temperature stress calibration platform based on laser ultrasonic method, which comprises a rail fixing device, a rail tension and compression device, a laser ultrasonic laser device and a laser ultrasonic receiving device, wherein the rail tension and compression device comprises a rail locking mechanism, an oil cylinder and a reversing valve, wherein the front and rear ends of the rail are respectively fixed with an oil cylinder on the same side; Tension or pressure is applied to the rail through the rail tension and compression device to change the stress state of the rail. Ultrasound is excited on the rail surface by the laser ultrasound excitation device, and the laser ultrasound receiving device receives the ultrasound signal to calibrate the receiving time under different stresses. Pulsed laser is used to excite ultrasound, without coupling agent, which is non-contact, with low requirement on rail surface, fast detection speed, high efficiency and precision.
