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:
Mar. 23, 2010
Filed:
May. 16, 2007
Robert C. Hon, Playa del Rey, CA (US);
Thomas H. Pollack, Santa Monica, CA (US);
Michael H. Kieffer, Redondo Beach, CA (US);
Carl S. Kirkconnell, Huntington Beach, CA (US);
Robert C. Hon, Playa del Rey, CA (US);
Thomas H. Pollack, Santa Monica, CA (US);
Michael H. Kieffer, Redondo Beach, CA (US);
Carl S. Kirkconnell, Huntington Beach, CA (US);
Raytheon Company, Waltham, MA (US);
Abstract
A system and method for sensing position of an oscillating moving element. The inventive position sensor includes a first arrangement for sampling the position of the element at first positions thereof and providing samples in response thereto and a second arrangement for calculating other positions of the element using the sample of the first position. In the illustrative application, the first arrangement includes an LED and a photodiode and the moving element is a piston of a long-life cryogenic cooler. A processor receives samples from the photodiode and solves an equation of motion therefor. The equation of motion is P(t)=A·sin(ωt+θ)+B, where P(t)=the position of the element; A=position waveform amplitude; B=position waveform DC Offset; ω=angular frequency of operation; t=time; and θ=position waveform phase.