抄録
In this article, we report novel measurement method designed by a couple of plane light sources made by IR-LED array and a photo interrupter. Light sources emit light by the same frequency and the different phase. And optical axis of the sources is set up as orthogonal. Then, the signal place is diffused with the space where phase is different in each position. And the signal which is received by photo interrupter is analyzed, the position is analyzed from the signal which is received by photo interrupter.
