Title:
光学変位センサ
Document Type and Number:
Japanese Patent JP4339693
Kind Code:
B2
Abstract:
The present invention relates to a compact and inexpensive optical displacement sensor system for determination of displacement of an object, which does not require accurate control of the distance to the object. The object is illuminated by a coherent light source for formation of speckle variations, and a repetitive optical structure is utilized to divert light from the illuminated object onto at least three optical detector elements. The speckle variations move with movement of the object, and speckle variation movement is determined without a need for imaging the object onto the repetitive optical structure. Since the speckle variations are not imaged onto the repetitive optical structure, the distance and possible distance changes between the object and the repetitive optical structure substantially do not affect system performance.
Inventors:
Hanson, Steen
Rose, bizarre
Jacobsen, Michelle, Linde
Rose, bizarre
Jacobsen, Michelle, Linde
Application Number:
JP2003568353A
Publication Date:
October 07, 2009
Filing Date:
February 13, 2003
Export Citation:
Assignee:
DANMARKS TEKNISKE UNIVERSITET
International Classes:
G01B11/00; G01B1/00; G01B9/02; G01B11/16; G01H9/00; G02B27/10
Domestic Patent References:
| JP8178936A | ||||
| JP8005961A |
Foreign References:
| US5004345 |
Attorney, Agent or Firm:
Shintaro Nogawa
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