レーザを用いたパーソナルコンピュータ制御微圧力計 : 第2報,光学系の配置

抄録

This paper describes an arrangement of optical devices in a computer-controlled liquid manometer which has been described in our previous paper. A configuration of a laser diode, two lenses, a glass tube manometer and a position-sensitive detector (PSD) is optimized based on optical principles. The spotlight directed at the bottom of the float located inside a glass tube manometer is focused nearly on the surface of the PSD, which is placed vertically to the optical axis of the lens. It was confirmed that the extent of movement of the image on the PSD increases almost linearly with increase in displacement of the float. When the float is placed at the zero position, the spotlight on the float is very small.