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. 03, 2003
Filed:
Oct. 30, 1998
John Weiss, Mt. Sinai, NY (US);
Irwin Weitman, East Northport, NY (US);
Jack L. Aronowitz, Pompano Beach, FL (US);
Abstract
A modulated light source emits light to illuminate a target surface which possesses a certain color and shade of color. Light that is reflected from the target surface is detected by an optical detector. The output from the optical detector is processed and fed back to the optical detector to compensate for any shift caused by ambient light, temperature or other external factors, and is differentially amplified to generate an output signal indicative of the color and shade of the target surface. The output signal from the differential amplifier is then demodulated by a synchronous detector to produce a substantially steady DC voltage that is indicative of the color or shade of color at the target surface. Where the target surface color shade is indicative of a certain measurable quantity or quality (such as an analyte concentration), the steady DC voltage is converted using a look-up table or mathematical formula into a corresponding quantity or quality measurement. In performing this conversion, compensation is made for any variations in modulated light source intensity due to temperature change.