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:
Apr. 13, 1999
Filed:
Aug. 02, 1996
Applicant:
Inventors:
Francesco Pompei, Boston, MA (US);
Janus Ternullo, Belmont, MA (US);
Assignee:
Exergen Corporation, Watertown, MA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
2503381 ; 25033904 ;
Abstract
A thermally differentiable pattern such as hot melt adhesive is monitored in a production line system. An electrical output from a thermopile radiation sensor is applied to a detection circuit which processes the sensor electrical output to perform an inverse to the sensor transfer function and to perform a differentiation which provides a pulsed output at rising and falling edges of the sensor signal. Comparators provide respective output pulse signals representing the respective rising and falling edges. An adjustable amplifier in the circuit adjusts pulse threshold relative to sensed radiation.