Abstract
In this paper, we propose a method for measuring distance independent of reflectance, shape and attitude by optical reflective sensors. This method uses two sensor layers: one layer has the sensor elements mounted in straight direction and the other has in tilt direction. The two sensor layer outputs have difference due to optical path length. By calculating the proportion of two sensor outputs, we can reject effect of reflectance, shape and attitude of object. We apply to multistage ring sensor for evaluate the availability of this method. Then, we examine distance measuring property of sensor for different object by experiments.
