| 摘要 |
A detecting device of an infrared ray sensor detecting a sense line state connecting the flood light and a light receiving device more than two are provided to increase the convenience and reliability of repair restoration by displaying the abnormal of a sense line. A detecting device of an infrared ray sensor includes a plurality of light receiving sensors(21A ~ 21N), amplifiers(22A ~ 22N), voltage converters(23A ~ 23N), a controller(24) and indication lamps(25A ~ 25N). A plurality of light receiving sensors receives the infra-red signal radiated to the frequency band which is independent from the light-transmission sensor. The received signal separates frequency and extracts only the pure infra-red signal. The voltage converter converts the frequency of the amplified infra-red signal into voltage. The controller compares reference voltage set in the sense line and voltage applied from the voltage converter. |
