抄録
This paper describes a new type of surface encoder for planar position measurement, which consists of a sinusoidal grid (target sine-grid) and an optical sensor unit. The optical sensor employs a transparent sine-grid instead of a grid pattern film used in a conventional surface encoder. The transparent sine-grid is generated on a glass plate with the same amplitude and wavelength as the target sine-grid. Simulation results have shown that planar displacement between the two sine-grids can be obtained from the output of the sensor unit. Compared with conventional surface encoder, the new type surface encoder is expected to have higher S/N ratio. Experimental results are also presented.
