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Optical displacement sensor

A technology of optical displacement sensors and photodetectors, which is applied in the direction of instruments, optics, optical components, etc., and can solve problems such as the impossibility of realizing small single-element optical systems

Inactive Publication Date: 2007-05-02
DANMARKS TEKNISKE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Small single-element optical systems not possible with this approach

Method used

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Experimental program
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Embodiment 80

[0112] Fig. 12 shows another embodiment 80 of the present invention which operates similarly to a laser Doppler anemometer. Light 82 emitted from point source laser 84 is collimated by lens 86 and the collimated light illuminates array 12 of cylindrical lenses. Lenses 88 and 90 form a telescope which images the focused spot of cylindrical lens 12 into measurement volume 92 so as to form a set of straight and equally spaced fringe planes 94 in measurement volume 92 . It can be seen that the first area occupied by the stripes 94 maps to the same second area 96 of the laser source 84 .

[0113] FIG. 13 shows another embodiment 100 of the invention similar to the embodiment 80 shown in FIG. 12 . However, in this embodiment, a spherical lens array 12 replaces the cylindrical lens array in FIG. 12 . This results in equally spaced and straight cylindrical focal lines 94 .

[0114] Particles or solid surfaces that create streaks in the measurement volume can scatter light. A detec...

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Abstract

The present invention relates to a compact and inexpensive optical displacement sensor that does not require accurate control of the distance to the object. A repetitive optical structure is utilized for formation of a repetitive optical signal emitted by an illuminated moving object. The repetitive optical structure is illuminated by the light source for formation of a fringe pattern similar to Laser Doppler Anemometry, and / or, an object is illuminated by the light source and the repetitive optical structure diverts light from the illuminated object onto light sensors. A speckle pattern is formed on the object by the illumination. The speckle pattern moves with movement of the object, and speckle pattern movement is determined without a need for imaging the object onto the repetitive optical structure. Since the speckle pattern is not imaged onto the optical member, the distance and possible distance changes between the object and the optical member substantially do not affect system performance.

Description

technical field [0001] The present invention relates to small and inexpensive optical displacement sensors for determining object displacements, eg linear displacements, angular displacements, vibrations and the like. Background technique [0002] Providing small and inexpensive sensors for determining the motion of objects is a long-sought goal. [0003] In "Detection of movement with laser speckle patterns: statistical properties", Schnell et al., Vol.15, No.1, January 1998, J.Opt.Soc.Am., disclose a method for determining the surface of diffuse objects Sensors for internal motion. Objects are illuminated by coherent light, and the interaction of light with the object's surface creates a speckle pattern. Two interleaved differential comb photodetector arrays act as periodic filters for the speckle pattern empty spectrum. The detector produces a zero-biased periodic output signal versus displacement, which can measure any low-speed motion. Using quadrature signals gener...

Claims

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Application Information

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IPC IPC(8): G01B11/16G01B9/02G01B11/00G01B1/00G01H9/00G02B27/10
CPCG01B11/002G01P3/36
Inventor 斯蒂恩·汉森比加克·罗斯迈克尔·林德·佳克伯森
Owner DANMARKS TEKNISKE UNIV