Optics: measuring and testing – Dimension – Width or diameter
Reexamination Certificate
2008-07-15
2008-07-15
Lauchman, Layla G. (Department: 2877)
Optics: measuring and testing
Dimension
Width or diameter
C356S497000, C356S479000
Reexamination Certificate
active
07400418
ABSTRACT:
It is disclosed a method and an apparatus of determining the distance (D) between a collimator lens (13) and an object. Low-coherence light is emitted from a light source (1) and directed the low-coherence light through a collimator lens (13) to the object. The reflected light from the collimator lens (13) and the object is directed to a beam splitter (4) and split into two beams. Within the reference arm the frequency of the beam is shifted by an acousto-optical modulator (5) to a certain frequency and within the delay arm the time delay of the beam is scanned by a variable delay line (7). After combining both beams in a beam combiner (8), the presence of a frequency component equal to the frequency shift of the acousto-optical modulator (5) is detected and the distance (D) between the collimator lens (13) and the object is calculated.
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Haffner Ken-Yves
Kempe Andreas
Roesgen Thomas
Schlamp Stefan
Alstom Technology Ltd
Buchanan & Ingersoll & Rooney PC
Lauchman Layla G.
Underwood Jarreas C
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