INVADER DETECTOR USING PHASE DIFFERENCE COUNTER TYPE OPTICAL SENSOR, ESPECIALLY INCLUDING AN OPTICAL DETECTOR AND A SIGNAL PROCESSOR

摘要

PURPOSE: An invader detector using a phase difference counter type optical sensor is provided to detect an invader from the outside by counting output waveforms of a phase difference counter type optical sensor during a predetermined period of time. CONSTITUTION: A light source(10) is used for generating continuously optical signals. A plurality of optical fibers(31,32) are installed in a predetermined interval from the light source to a bottom face(60). An optical fiber connector(20) is connected between the light source and each of the optical fibers in order to transmit the optical signals according to each of the optical fibers. An optical detector(40) is used for detecting optical signals having different phase differences according to each pressing level to the optical fibers. A signal processor(50) is electrically connected to the optical detector in order to compare corresponding absolute voltage levels of the optical signals with a reference voltage level and comparing the number of phase difference coefficients of the optical signals with a warning reference number and a danger reference number, respectively.