New technique of photodisplacement imaging using one laser for both excitation and detection

Chen, L.; Yang, K. H.; Zhang, S. Y.
May 1987
Applied Physics Letters;5/11/1987, Vol. 50 Issue 19, p1349
Academic Journal
A new interferometry technique has been developed that uses only a single laser for both exciting and detecting photothermal displacement, which greatly simplifies the system and the optical alignment. The minimum detectable displacement 10-2 Ã…/(Hz)1/2 is obtained. To examine this setup, we have performed a simulated experiment. And also, we have succeeded in imaging the subsurface flaw in a copper block. The preliminary results demonstrate that this new method is very promising for nondestructive evaluation and other applications.


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