G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/84 (2006.01) G01N 21/35 (2006.01) G01V 8/12 (2006.01)
Patent
CA 2048737
N 35893 ABSTRACT OF THE DISCLOSURE BLASTING ACCESSORY 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 (30a, 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.
Imperial Chemical Industries Plc
Marks & Clerk
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