Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1976-03-10
1977-07-26
McGraw, Vincent P.
Optics: measuring and testing
Range or remote distance finding
With photodetection
328 7, G03B 2704
Patent
active
040379639
ABSTRACT:
A spark discharge test apparatus has a holder electrode conductively engageable with a workpiece, a counter electrode adapted to be spaced by a gap from the workpiece while it is in contact with the holder electrode, a power supply including a closable switch and connected across the electrode for passing a unipolar electrical pulse across the gap only when the switch is closed, and a circuit including a terminal connectable to the workpiece and connected so as to close the switch allowing operation of the power supply only on detection of a closed circuit between the terminal and the holder electrode. Thus, a unipolar electrical pulse can only be fired between the counter electrode and the workpiece when the workpiece is in good electrical contact with the holder electrode. This safety circuit comprises a low-voltage relay having one side connected to a low-voltage power supply and another side connected to the terminal. The other side of the low-voltage power supply and the holder electrode are connected to ground.
REFERENCES:
patent: 3791743 (1974-02-01), Cody et al.
patent: 3942892 (1976-03-01), Ambrose et al.
Berstermann Wilhelm
Grisar Ulrich
Klockner-Werke AG
McGraw Vincent P.
Striker Michael J.
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