Detector assemblies and methods

Details Detector assemblies and methods Detector assemblies and methods

2005-04-26

2005-04-26

Patidar, Jay (Department: 2862)

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

C324S174000, C033S352000, C033S0010PT

Reexamination Certificate

active

06885188

ABSTRACT:
The rotational position of a shaft (10) with respect to a sleeve (12) is determined by using a sensor (14) rotating with the shaft (10) to detect an earth vector such as magnetic or gravitational field, using a coil (18) on the shaft in conjunction with a plurality of ferromagnetic elements (16) on the sleeve to monitor relative rotation, and calculating the rotational position from these parameters. Applicable to downhole use, particularly gamma ray measurements.

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patent: 6617980 (2003-09-01), Endo et al.
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patent: 1 552 864 (1979-09-01), None
patent: 2 135 060 (1984-08-01), None

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