Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1981-01-19
1983-09-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
350 9610, 356239, 1022758, G01N 2100, G02B 514, C06C 504
Patent
active
044031432
ABSTRACT:
A continuity checking system for detonating cord having four principle parts. The detonating cord has a fiber optic cord associated therewith to run from the blasting cap to a remote primer; a light return device is installed at the primer; a disposable testing head is installed at the end of the detonating cord adjacent the blasting cap; and a testing device is positioned a safe distance away from the disposable testing head. The testing head utilizes an LED with means for illuminating the end of the fiber optic cord, and a light sensitive device with means for sensing return light from the fiber optic cord. An electrical input signal, and an electrical output signal from the disposable testing head is communicated by electrical wires to the remote testing device. The remote testing device functions to test for a signal from the light sensitive device before supplying an input signal to the LED following which a time delay is initiated before the output signal from the light sensitive device is used to indicate continuity.
REFERENCES:
patent: 3724383 (1973-04-01), Gallaghan et al.
patent: 3981592 (1976-09-01), Williams
patent: 4000416 (1976-12-01), Goell
patent: 4070118 (1978-01-01), Maslowski
patent: 4223226 (1980-09-01), Quick et al.
Veno et al., "Optical Fiber Fault Location Method"; Applied Optics, vol. 15, No. 6, pp. 1385-1388, Jun. 1976.
Heckelman James D.
Walker Richard E.
Ziemke Robert A.
Hickey William P.
Nelms David C.
Research Energy of Ohio, Inc.
Westin Edward P.
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