Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1980-11-17
1983-05-03
Tokar, Michael J.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
340620, 244151B, G01N 2702
Patent
active
043822312
ABSTRACT:
Apparatus for sensing the electrical conductivity of field including a pair of electrodes and a capacitive type conductivity sensing circuit which in response to the electrodes being exposed to fluid of predetermined minimum conductivity under conditions involving a predetermined minimum rate of change of conductivity applies a gating voltage to the control terminal of a semiconductor device switching it into conduction to define a current flow path through a load. The load can be an ignition capacitor for an electro explosive device which, in turn, can be employed in a release mechanism for uncoupling a parachute canopy from its load upon landing in water. A semiconductor switch defines a discharge path for the ignition capacitor through the electro explosive device. A timing network connected to the ignition capacitor and semiconductor device and including a current regulating device and capacitor causes the semiconductor device to switch into conduction to define the discharge path to detonate the electro explosive device a predetermined time after initiation of charging of the ignition capacitor independent of the rate of charging of the ignition capacitor.
REFERENCES:
patent: 3498131 (1970-03-01), Rickey
patent: 3910457 (1975-10-01), Sutliff
patent: 4024440 (1977-05-01), Miller
patent: 4137527 (1979-01-01), Tennenhouse
patent: 4227190 (1980-10-01), Kelley et al.
patent: 4253628 (1981-03-01), Marek
Conax Corporation
Tokar Michael J.
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