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Dimension measurement sensor with deviation correction function

A technology for measuring sensors and dimensions, which is applied in the field of sensors to improve detection accuracy and reduce installation errors

Pending Publication Date: 2021-06-04
SHANGHAI LANBAO SENSING TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, in the actual installation process, the installation positions of the transmitting unit and the receiving unit of the size sensor may inevitably have a deflection angle

Method used

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  • Dimension measurement sensor with deviation correction function
  • Dimension measurement sensor with deviation correction function
  • Dimension measurement sensor with deviation correction function

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Experimental program
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Embodiment Construction

[0012] The measuring principle of the dimension measuring sensor is as follows: figure 1 As shown, the light shines from the left to the right of the figure, the circle in the middle represents the object to be measured, and the light shines on the CCD flat panel device on the right. Such as figure 2 As shown, ideally, the light is incident on the surface of the CCD, and the measured size is the actual size of the target. If the receiving photosensitive CCD element is tilted in the measurement direction, the shadow of the target object will be elongated, resulting in a larger measurement width. The specific calculation can refer to the following formula:

[0013] L'=L / cosa (1)

[0014] Where a is the deflection angle of the photosensitive element, L is the actual value, and L' is the measured value. This situation will lead to a deviation in the measurement data, the deviation is:

[0015]

[0016] At present, there is no good solution, generally by improving the alig...

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Abstract

The invention relates to a size measurement sensor with a deviation correction function. The size measurement sensor comprises a transmitting unit and a receiving unit, wherein the emitting unit is sequentially provided with a light source, an achromatic collimating lens and a diaphragm according to an emitting light path; the receiving unit is sequentially provided with a narrow-band optical filter, a photosensitive device and a linear array CCD which are respectively positioned at two ends of the narrow-band optical filter according to a receiving optical path, and a deviation rectifying indicator lamp which is also arranged on the receiving unit. The light emitted by the emitting unit enters the receiving unit, if the incident light of the receiving unit is not perpendicular to the surface of the linear array CCD of the receiving unit, and the incident light enters the photosensitive device, the deviation rectifying indicator light is triggered to be turned on to prompt that the receiving unit and the emitting unit have a deflection angle relation, and the deviation rectifying indicator light is turned off. The deflection angle can be corrected to 0 degree by adjusting the installation position of the size measuring sensor.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to a dimension measuring sensor with a deviation correcting function. Background technique [0002] Dimensional measurement sensors are sensors that detect and measure the width and position of objects, and are widely used in the field of industrial precision detection. The key of this technology is to collimate the point light source into a beam of parallel light, and the light beam illuminates the photosensitive element. When the object enters the range of the parallel beam, a proportional shadow will appear on the photosensitive element. By measuring the size of the shadow or the light received The size of the object can be obtained by the change of the quantity. Existing size measurement sensors need to use a parallel light source to irradiate the photosensitive element, and measure the width of the "shadow" of the measured object through statistics to further obtain the size o...

Claims

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Application Information

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IPC IPC(8): G01B11/00
CPCG01B11/00G01B21/042
Inventor 许永童谢勇马路明祁伟光田敏李红娟
Owner SHANGHAI LANBAO SENSING TECH
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