Displacement measurement is very important in the industrial manufacture and environmental test. For example, when a specimen is accelerated, the distortion will often be measured to evaluate the resistance to pressure. Therefore, displacement measurement may reflect the performances of the structure of the specimen, providing scientific basis for designer. In order to measure displacement more precisely and satisfy the test conditions more perfectly, a new mask intensity modulation type of displacement measuring system using fiber optic sensor is designed, avoiding using expensive optical system and reducing the complexity in debugging, as well as linearity being good and anti-electromagnetic interference capability being strong. It is composed of three parts, the fiber optic sensor whose structure is compact and reliable, the displacement measuring circuit and the computer. By the appropriative software, it can measure and display the displacement in real time. This paper briefly introduces its operating principles and circuit design, meanwhile it can be applied in the linear acceleration test.
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