Chinese Optics Letters, Vol. 2, Issue 7, 07396 (2004)
A modified moire interferometer for three-dimensional displacement measurement
Weining Wang1,*and Jianhai Sun2
- 1Department of Physics, Capital Normal University, Beijing 100037
- 2Institute of Electronics, Chinese Academy of Sciences, Beijing 100080
This paper presents a new optical interferometric system, MMI-T/G, composed of a modified four-beam moire interferometer and a Twyman/Green interferometer. The MMI-T/G system can measure three-dimensional displacement fringe patterns with a single loading on the specimen, and the in-plane and out-of-plane displacement fields can be measured independently and defined clearly. The optical setup has the advantages of structural novelty, flexibility, and high fringe contrast. Moreover, the in-plane displacement sensitivity is twice of that of the normal moire interferometer. The measuring techniques to obtain the fringe patterns and displacement fields using the MMI-T/G system are described. The experimental results of thermal displacement of an electronic device are shown.