Movement detector
US4212005A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1978 |
| Grant date | Jul 8, 1980 |
| Priority date | — |
| Expiry date | Jun 28, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/1654
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.