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:
May. 12, 1992
Filed:
Mar. 29, 1991
Applicant:
Inventor:
John D Smith, Houston, TX (US);
Assignee:
ABB Vetco Gray Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
25022721 ;
Abstract
An interferometer for measuring pressure using optic fibers has a temperature compensating device. The instrument has an optic fiber sensing leg and an optic fiber reference leg, both of which are clamped in tension. An elongated reference compensating member extends parallel to the reference leg. A similar sensing compensating member compensates parallel to the sensing leg. The compensating members will apply selected tension. The compensating members are expansible in response to temperature change. The lengths of the compensating members can be changed, as well.