The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 2007
Filed:
May. 13, 2003
Maxwell R. Hadley, Lyndhurst, GB;
Arthur H. Hartog, Southampton, GB;
Yuehua Chen, Reading, GB;
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
A method and apparatus for receiving measurements from an interferometer transducer () uses a broad band light beam (A), reflected from the transducer (), and compares it with the amplitudes of narrow band beams, derived from the reflected broad band light beam (A), by filters (A-D) on different frequencies. The narrow band light beams and the broad band light beam (A) are measured on photo detectors (A,B-E). Microprocessor () compares outputs of the photo detectors to interpret phase differences between signals () from the narrow band beams. A periodically operable shutter and a single photo detector () can also be used. Other embodiments modulate () the light source () to produce very short broad band pulses of light () which are reflected from the transducer ().