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. 26, 2001
Filed:
Oct. 16, 1999
Ernst Georg Frisch, München, DE;
Walter Braumandl, Thurmansbang, DE;
Sensor Instruments GmbH, , DE;
Abstract
In a method for determining the length of a light guide light of two different wavelengths or wavelength ranges is passed through a light guide whose length is to be measured. The ratio of incident light intensity to exit light intensity for each one of the wavelengths or wavelength ranges of the light passing through the light guide is determined. The length of the light guide is calculated based on wavelength-dependent attenuation coefficients of the light guide and the ratios of incident light intensity to exit light intensity for each one of the wavelengths or wavelength ranges of the light. The device for determining the length of a specimen light guide has a light source emitting a light beam, a device for introducing the light beam emitted by the light source into a light window of the specimen light guide, a first measuring device for determining of ratio of incident light intensity of the light beam at the light window for two different wavelengths or two wavelength ranges, and a second measuring device for determining a ratio of exit light intensity for the two different wavelengths or the two different wavelength ranges of light exiting from the exit window of the specimen light guide.