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:
Jul. 15, 2008
Filed:
Jul. 20, 2005
Ken-yves Haffner, Baden, CH;
Andreas Kempe, Zurich, CH;
Thomas Roesgen, Kilchberg, CH;
Stefan Schlamp, Zurich, CH;
Ken-Yves Haffner, Baden, CH;
Andreas Kempe, Zurich, CH;
Thomas Roesgen, Kilchberg, CH;
Stefan Schlamp, Zurich, CH;
Alstom Technology Ltd, Baden, CH;
Abstract
It is disclosed a method and an apparatus of determining the distance (D) between a collimator lens () and an object. Low-coherence light is emitted from a light source () and directed the low-coherence light through a collimator lens () to the object. The reflected light from the collimator lens () and the object is directed to a beam splitter () and split into two beams. Within the reference arm the frequency of the beam is shifted by an acousto-optical modulator () to a certain frequency and within the delay arm the time delay of the beam is scanned by a variable delay line (). After combining both beams in a beam combiner (), the presence of a frequency component equal to the frequency shift of the acousto-optical modulator () is detected and the distance (D) between the collimator lens () and the object is calculated.