Blasting accessory

Details Blasting accessory Blasting accessory

1991-08-07

1993-02-09

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

102200, 2503581, G01N 2135

Patent

active

051855283

ABSTRACT:
The invention provides a blasting accessory (5a, 5b, 5c) and related method which can be used to test whether a shock/signal tube (75a, 75b, 75c) has been fired and/or to distinguish one type of tube (75c) from another. This addresses a problem in the Prior Art, namely that it is difficult for a field operator to distinguish between live and fired tubing or different types of tubing. The accessory (5a, 5b, 5c) comprises an IR source (30a, 30b, 30c) spaced from and facing a Si photodetector (35a, 35b, 35c). An output of the detector (35a, 35b, 35c) is connected via discrimination circuitry. (40a, 40b, 40c) to either status indication means (40a, 40b) or proportional indication means (45c). In use, a shock/signal tube (75a, 75b, 75c) is located between the source (30 a, 30b, 30c) and detector (35a, 35b, 35c). The amount of radiation passing through the tube (75a, 75b, 75c) in its transverse direction provides an indication of whether the tube (75a, 75b, 75c) has been fired and/or what type of tube (75c) is under test.

REFERENCES:
patent: 4403143 (1983-09-01), Walker et al.

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