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. 04, 1991
Filed:
Mar. 05, 1990
Applicant:
Inventors:
William C Dunn, Mesa, AZ (US);
Stuart T Langley, Phoenix, AZ (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J / ; G01J / ;
U.S. Cl.
CPC ...
356328 ; 35016223 ; 35016224 ; 357 30 ;
Abstract
A monolithic diffraction spectrometer having a diffraction grating formed over a light sensing array is provided. The diffraction grating serves to diffract wavelengths of interest to an underlying photosensitive device while diffracting other wavelengths away from the photosensing element. By forming a diffraction grating with a variable pitch, or multiple diffraction gratings having various pitches, any number of specific light wavelengths can be detected with a high degree of precision. When a diffraction grating having a pitch which is in the order of the incident wavelength of light is used, improved sensitivity is achieved.