High frequency type sensing device

Details High frequency type sensing device High frequency type sensing device

1995-11-30

2000-08-22

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

324204, G08B 2100

Patent

active

061079243

ABSTRACT:
A sensing device in which a high frequency signal is transmitted from an oscillator to a sensor through a transmission path, a reflection signal generated according to a variation of an impedance of the sensor sensing the presence or absence of an article is detected by a reflected wave sensor, and the presence or absence of the article is detected by the presence or absence of the reflection signal and a level of the signal, whereby the presence or absence of an article other than metal and the kind of the article can be detected regardless of whether a container holding the article is transparent or opaque.

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