Grating displacement sensor and automatic detection equipment

Abstract

The invention provides a grating displacement sensor and automatic detection equipment. The grating displacement sensor comprises infrared light emitting diodes, a scale grating, an indication grating, an infrared photoelectric receiver and a processing module all arranged in a cavity; the infrared light emitting diodes emit an infrared point light source; the infrared photoelectric receiver is used for receiving a moire fringe optical signal which is obtained after that the infrared point light source passes the scale grating and the indication grating, and converting the moire fringe opticalsignal into an electric pulse signal; and the processing module converts the electric pulse signal into displacement, determines the moving distance of a measuring rod according to the displacement,and obtains the size of a detected part according to the moving distance of the measuring rod. According to the invention, additional lenses are not needed, the infrared light emitting diodes are uniformly arranged on an infrared emitting circuit board to obtain parallel light, high-quality moire fringes are obtained after that the parallel light passes the scale grating and the indication grating, the measuring precision of the grating displacement sensor is improved, the size of the same is reduced, and the grating displacement sensor and automatic detection equipment can applied to more occasions.

Description

technical field [0001] The invention relates to the technical field of measuring instruments, in particular to grating displacement sensors and automatic detection equipment. Background technique [0002] At present, visible divergent light is used as the light source of the grating displacement sensor. Since the visible divergent light is composite light, which includes a variety of light waves, the quality of the moiré fringes produced by the visible divergent light is not high. When the visible divergent light is used as the light source of the grating displacement sensor , the accuracy of the grating displacement sensor will be reduced. In addition, when visible diverging light is used as the light source of the grating displacement sensor, lenses need to be added in the optical path to generate parallel light, which increases the size of the grating displacement sensor, making it unusable in many occasions. Contents of the invention [0003] In view of this, the obje...

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Problems solved by technology

[0002] At present, visible divergent light is used as the light source of the grating displacement sensor. Since the visible divergent light is composite light, which includes a variety of light waves, the quality of the moiré fringes produced by the visible divergent light is not high. When the visible divergent light is used as the light source of the grating displacement sensor , the accuracy of the grating displacement sensor will be reduced

In addition, when visible divergent light is used as the light source of the grating displacement sensor, it is necessary to add a lens in the optical path to generate parallel light, which increases the size of the grating displacement sensor, making it unusable in many occasions.

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