Movement detector

Details Movement detector Movement detector

1978-06-28

1980-07-08

Stewart, David L.

Communications: electrical

Condition responsive indicating system

Specific condition

73304C, 116109, 361284, H04B 700, H04B 900

Patent

active

042120055

ABSTRACT:
The invention relates to a movement detector, more particularly a sensor comprising a container partially filled with a liquid into which three electrodes extend. An input alternating signal is applied to two of the electrodes and an output signal amplitude modulated in accordance with movement of the liquid in the container, is detected from another two of the electrodes by means of a sensing circuit which includes a demodulator for detecting the amplitude modulation and a circuit arrangement which provides a container movement signal in response to successive peaks in the demodulated signal which are in excess of a given threshold value being spaced apart in time from one another by a time dependent upon the peak magnitudes of the demodulated signal.

REFERENCES:
patent: 2768368 (1956-10-01), Crane
patent: 2771592 (1956-11-01), Edmonson
patent: 4122718 (1978-10-01), Gustafson
patent: 4133453 (1979-01-01), Ohbora

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