Well logging detector with decoupling optical interface

Details Well logging detector with decoupling optical interface Well logging detector with decoupling optical interface

1988-10-20

1990-02-13

Hannaher, Constantine

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

250361R, 250368, G01T 1202

Patent

active

049009370

ABSTRACT:
A well logging detector includes an elongated scintillation crystal having one end biased against and optically coupled to a transparent window portion of the detector housing. The biasing force on the crystal is provided by a compression spring located at and bearing against the other end of the crystal. The biasing force applied to the crystal by the spring is weak enough to allow the crystal to move away from and optically decouple from the window portion in response to shock forces on the detector. Subsequent to such shock induced decoupling, the biasing spring moves the crystal against the window portion to re-establish optical coupling therebetween. Such a biasing structure precludes excessive axial loading of the crystal by shock forces tending to move the crystal against the window as opposed to away from it. Such a shock resistant detector is especially well suited to measurement-while-drilling (MWD) applications.

REFERENCES:
patent: 2902603 (1959-09-01), Ferre
patent: 4004151 (1977-01-01), Novak
patent: 4158773 (1979-06-01), Novak
patent: 4360733 (1982-11-01), Novak et al.
patent: 4383175 (1983-05-01), Toepke
patent: 4764677 (1988-08-01), Spurney
patent: 4833320 (1989-05-01), Hurlbut

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