Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative
Patent
1985-11-18
1991-04-09
Snow, W.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonquantitative
324515, G01R 1914, G01R 3108
Patent
active
050067915
ABSTRACT:
A circuit is disclosed for detecting a conductive region in a body. The circuit includes a remote module (12) coupled to a driver and logic module (14). The remote module is mountable on a probe (16) and senses contact between a conductive detector electrode and the conductive region. The driver and logic module provides energy to the remote module and responds to the operation of the remote module by producing an output indicative of detection of the conductive region. In the preferred arrangement, current from a constant current source Q.sub.4 normally flows through a first transistor Q.sub.1, which is maintained in an "on" state by a charged capacitor C.sub.1. When the detector electrode contacts the conductive region, however, charge is bled from the capacitor, switching the first transistor to an "off" state and causing the current from the current source to be redirected to a switching transistor Q.sub.3. As a result, the switching transistor momentarily switches to an "on" state, causing a latch (18) to set a status signal at terminal S indicating detection of the conductive region.
REFERENCES:
patent: 2823425 (1959-02-01), Huggins
patent: 3413541 (1968-11-01), Swim et al.
patent: 4016490 (1977-04-01), Weckenmann et al.
patent: 4334188 (1982-06-01), Dudley
Snow W.
The Boeing Company
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