Piezoelectric motion sensor
US5258743A · kind A · utility
14Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1993 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Jan 4, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/1472
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A piezoelectric resilient arm contacts a projected object and establishes a reference relative to sensitivity means and differential detector means including feedback coupled amplifier means which operates in cooperation with a balanced square wave generator means for producing a switched output upon detecting motion. An alarm signal is produced which has a duration related to the rate of change of movement of the piezoelectric resilient arm. Programmable delay means appropriately enables an annunciator and/or wireless communication link to a system controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.