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:
Dec. 10, 2002
Filed:
Jul. 24, 2000
Applicant:
Inventors:
Lars Lading, Roskilde, DK;
Lars Lindvold, Kokkedal, DK;
Assignee:
Torsana A/S, Skodsborg, DK;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01B 9/02 ;
U.S. Cl.
CPC ...
G01B 9/02 ;
Abstract
A sensitive refractive index based detector comprises a first laser cavity ( ) and a second laser cavity ( ′) each for generating a respective laser light beam. Each laser cavity is defined in a planar waveguide. The surface of the waveguide of the first laser ( ) receives a sample to be detected. Light from the two lasers is mixed using a coupling grating ( ) and a beat frequency between the lasers dependent upon the refractive index of the substance is measured at a detector ( ). Extremely sensitive measurement of small quantities of substance are made possible.