(57) Abstract Objective As decision level is configurated automatically, certaintyIt reports whether or not it can detect. Constitution As for micro-computer 1 1st and 2ndWhen configuration switch 9 and 10 is manipulated, detection puroguRam (main program) and gain configuration programRunning, level of the light absorbent signal which responds to the presence of the detected materialAs you store, according to those levels light absorbent gainLight absorbent gain of the variable circuit 8 is configurated. In addition, microphone locoAs for npiyuta 1, is stored level difference of the light absorbent signal which configurationWhen being smaller than the extra space value which the re te is, alarm output toranjiAs the alarm signal is output to star 20, alarm & display LED13 it lights up. On the one hand, when being larger than extra space value, the soIt exceeds disturbance light and the extra space value for noise in configuration state,Because it becomes securely detection possible due to ru thing, really suffering detectionIt is not necessary to do test making use of the thing.
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