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:
Jul. 21, 2009
Filed:
Feb. 20, 2004
Joseph V. Mantese, Shelby Township, MI (US);
Norman W. Schubring, Troy, MI (US);
Adolph L. Micheli, Harrison Township, MI (US);
Carlos Paz DE Araujo, Colorado Springs, CO (US);
Larry Mcmillan, Colorado Springs, CO (US);
Jolanta Celinska, Colorado Springs, CO (US);
Joseph V. Mantese, Shelby Township, MI (US);
Norman W. Schubring, Troy, MI (US);
Adolph L. Micheli, Harrison Township, MI (US);
Carlos Paz De Araujo, Colorado Springs, CO (US);
Larry McMillan, Colorado Springs, CO (US);
Jolanta Celinska, Colorado Springs, CO (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A pyroelectric sensor for determines a charge output of a ferroelectric scene element of the sensor by measuring the hysteresis loop output of the scene element several times during a particular time frame for the same temperature. An external AC signal is applied to the ferroelectric scene element to cause the hysteresis loop output from the element to switch polarization. Charge integration circuitry is employed to measure the charge from the scene element. The ferroelectric of the scene element is made of strontium bismuth tantalate, or derivative thereof, disposed directly between top and bottom electrodes. The polarization of the reference element which is compared to and subtracted from the polarization of the scene element for each cycle. The polarization difference measured for each cycle over a set time period are summed by an integrating amplifier to produce a signal output voltage.