| 摘要 |
PURPOSE:To surely detect the state of parts to be detected by grouping optical fibers which are disposed at one end to the parts to be detected having the approximate quantity of the light to be detected, detecting the light in the respective group units and discriminating the state. CONSTITUTION:The optical fibers disposed to the parts to be detected having the approximate quantity of the light to be detected are grouped and the light rays emitted from the other end of the optical fibers 1, 2 are detected by a PD. The current flowing in the PD is converted to a voltage by an operational amplifier OP. The voltage is inputted to a state discriminating circuit 20, by which the voltage is subjected to A/D conversion and the bright and dark states of the respective parts are decided. |
