Dual wheatstone bridge strain gage marine intrusion sensor
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United States of America Patent
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-
Nov 27, 1990
Grant Date -
N/A
app pub date -
Oct 10, 1989
filing date -
Oct 10, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Two wheatstone bridge circuits, each having detectors in the form of strain gages in the arms thereof, are connected to carry out detection of entry into the perimeter of the detection area such as the main deck of a boat. Each of the wheatstone bridge circuits has a strain gage mounted on the underside of the main deck or therein in a corresponding one of four areas of the perimeter being secured so that two strain gages of the system carry out intruder detection by imbalance of the corresponding bridges when an intruder enters an area. Each bridge circuit has an amplifier connected to receive the corresponding bridge circuit output and an AND logic circuit voltage output controls activating triggering of a monitor circuit when both bridge circuits are imbalanced. Each amplifier is adjustable so that individual bridge circuit sensitivity is possible to compensate for environmental and operating conditions on the main deck of a vessel or boat. The individual amplifiers can be tare adjusted to effect the equivalent or zeroizing the corresponding bridge if unbalanced without affecting the sensitivity of the corresponding bridge.
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