An automatic vernier scale method by CCD linear sensor

In this paper, we propose a new automatic dimension and displacement measuring method for high resolution by using the principle of vernier caliper. In this method, the main scale and the vernier scale are replaced with two different pitch CCD linear image sensors, respectively. The system detects number of the pixel at which the main scale coincides with the vernier scale and can measure in higher resolution than the original CCD pitch. Consequently, the proposed method is effective for precise dimension and displacement measurement