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:
Jun. 05, 1990
Filed:
Aug. 26, 1988
Raymond W Huggins, Mercer Island, WA (US);
The Boeing Company, Seattle, WA (US);
Abstract
A sensor for determining the value of a measurand, such as the rotational position of a shaft (32). The sensor includes a wavelength sensitive beamsplitter (44), an encoder (30), and a wavelength sensitive modulator (48). A beamsplitter receives an optic input signal (60) having first (80) and second (82) wavelength bands, and forms the input signal into first (62) and second (64) beams corresponding to the wavelength bands. The encoder includes a track (36). The modulator preferentially modulates the intensity of light in the first wavelength band in comparison to light in the second wavelength band. The first beam is modulated by the encoder to form a modulated first beam (66), and the second beam is modulated by the modulator to form a modulated second beam (68). A differential embodiment is also provided in which the encoder comprises a pair of mechanically coupled tracks, one track modulating each beam.