本文旨在探討一種有關變形量的量測方式，將一片反射式的光柵薄膜緊密黏貼在待檢測的物體上，並使用雷射照射在光柵上，此時光柵會產生繞射光，當待檢測的物體有變形量時，光柵片也會隨之變形，而使得光柵的條紋密度發生變化。依據光柵繞射原理，得知繞射光的角度會隨光柵條紋密度改變，利用PSD可準確地得知繞射光變形前後的角度差，此由繞射光的角度差推算，即可量測待測物的變形量。
本量測系統之組成包括反射式光柵薄膜、雷射光源、PSD、PSD訊號放大器及其電源供應器、前鍍式反射鏡等。
利用此自行開發之變形量測器，分別進行彎曲試驗及拉伸試驗，實際對物體量測應變，取得實驗數據，並同時在相同條件下使用應變規法量測，以光柵式變形量測器量測之電壓輸出與應變規量測值作線性分析與比較，證明此量測器的可行性。

The subject of this thesis is to design and fabricate an optical deformation measurement device. A reflective grating film is bonded on the specimen to serve as a sensor, and a laser diode is used as the light source. As the laser beam strikes the grating the diffraction rays can be observed as well as the reflective ray. When the specimen is deformed, the grating film on the specimen is deformed accordingly, and, the frequency of the grating is altered. According to the principle of diffraction the direction angle of diffraction ray changes following the frequency changes of the grating. A PSD sensor is employed to detect the difference of the diffraction angle before and after the deformation. The deformation of specimen can be measured by calculating the change of the diffraction angle.
The measurement system consists of a reflective grating, a laser diode, a PSD, two first surface mirrors, a PSD signal processing circuit, and a power supply etc.
Deformations in a bending test and a tension test are measured by the proposed system to show the performance. The experimental data are recorded and compared with those measured by strain gages under the same condition. The results show a good linear correlation between these two techniques.

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