BY DETACHABLE DOUBLE-REFERENCE-BEAM
DOUBLE-HOLOGRAPHY

Li Guancheng  Yu Yanchun

(Department of Physics & Mathematical, Huaihai Institute of Technology, Lianyungang 222005)

Feng Ying

(Department of Physics & Mathematical, Northeast China Institute of Electric Power Engineering, Jilin 132000)

Liu Xiaoting

(Department of Physics, Nanjing University of Aeronautics & Astronautics, Nanjing 210016)

Cai Jing

(No.55 Research Institute, China Electronics Technology Group Corporation, Nanjing 210016)

Abstract: The method of measuring direction of mechanical deformation by detachable-double- reference-beam double- exposure holography is proposed.  In the optical system designed, a spread beam is divided in the two reference beams and one object beam with the help of the two planar mirrors, Thus the double-exposure interferogram of the measured object under constant deformation can be recorded, This kind of interferogram carries double informations on quantity and direction of deformation of measured objec, Problem on information of deformation direction is analyzed in theory. The method of using detachable-double-reference-beam double-exposure holography to measure deformation direction is described. Experimental results are given.

Key words: Detachable double-reference-beam  double-exposure-holography  Direction of mechanical distortion  Measure

CLC No: TH822  O348.11  TN249

Received 20041101, received in revised form 20050415