SU1379618A1 - Device for checking surface roughness - Google Patents

Abstract

The invention relates to a measurement technique and can be used, in particular, to control the quality of a surface. The purpose of the invention is to simplify the design and improve the accuracy of control. The device contains a source of light 1, a colli- ming lens 2, the first and second coaxially arranged cylindrical reflectors 3 and 4, the axis of which coincides with the optical axis of the collimating liiza 2, and in the last of them the source 1 of light is installed. to

Description

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a semitransparent plate 5 located between the source of light 1 and the collimating lens 2 at an angle to the axis of the latter and fixed on the second cylindrical reflector 4, the reference photodetector 6 located on the axis, the point of intersection of which with the optical axis of the collimating lens 2 lies on the surface of the translucent plate 5 the source of the light source 1, a photodetector 7 for detecting specularly reflected radiation, located on an axis, the point of intersection of which with the optical axis of the collimating lens 2 lies on

the surface of the semitransparent plate 5 from the side of the collimating lens 2, the photodetector 8 for detecting diffusely reflected radiation, located on the optical axis of the collimating lens 2 behind the light source 1, the diffuser 9 to ensure uniform distribution on the photoreceiver 8, the signal processing unit (not shown) from photo detectors 6, 7, and 8. Photograph comparison detector 6 and photo detector 7 for detecting the reflected radiation are installed in the second cylindrical reflector D. 1 Il.

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The invention relates to a measurement technique and can be used, in particular, to control the quality of a surface.

The purpose of the invention is to simplify the design and increase the accuracy of control by installing a comparison photoreceiver and a photodetector for detecting specularly reflected radiation in the second cylindrical reflector (since there are no strict requirements on the accuracy of positioning and fabrication of elements of the device, the setting is only to install a light source into the focal region of the collimating lens), as well as by eliminating the effect on the control of the holes of the cylindrical reflectors.

The drawing shows a schematic diagram of a device for monitoring surface roughness.

The device contains a source of light 1, a collimating lens 2, first and second coaxially arranged cylindrical reflectors 3 and 4, the axis of which coincides in the optical axis of the collimating lens 2, and in the last of them the source 1 of light is installed, a translucent plate 5 located between 1 of the light and the collimating lens 2 at an angle to the axis of the latter and mounted on the second cylindrical reflector 4, the comparison photodetector 6, is located

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on the axis, the point of intersection of which with the optical axis of the collimating lens 2 lies on the surface of the semitransparent plate 5 from the side of the source 1 of the light plates

5 with the side of the collimating lens 2, the photodetector 8 for detecting diffusely reflected radiation, located on the optical axis of the collimating lens 2 behind the light source 1, the diffuser 9 for ensuring uniform flow distribution on the photoreceiver 8 and the unit (not shown) of signal processing from the photoreceivers 6- 8, with the comparison photoreceiver 6 and the photoreceiver 7 for detecting the specularly reflected radiation installed in the second cylindrical reflector 4.

The device works as follows.

The radiation sent by the light source 1 hits the semitransparent plate 5 and is split in two. The reflected beam hits the photodetector

6 comparison. The passed beam by the collimating lens 2 is projected onto the controlled surface 10. The light source 1 is located in the focal area of the collimating lens 2, therefore the illumination of the controlled surface 10 occurs by a parallel beam normal to it. The radiation reflected from the surface 10 is divided into two components: specular and diffuse. The specular component passes the collimating lens 2 and 1 after reflection from the translucent plate 5 is collected on the photodetector 7 to register the specularly reflected radiation. The diffuse component, having repeatedly reflected from the surface of the first and second cylindrical reflectors 3 and A, passes the scatterer 9 and hits the photodetector 8 for detecting diffusely reflected radiation. The signal processing unit from photodetectors 6-8 processes the signals received from them and outputs the result to a reading device (not shown).

Claims (1)

Invention Formula A device for controlling surface roughness, containing a successively installed light source and a collimating lens, two coaxially arranged cylindrical reflectors installed so 0 five 0 five 0 that their axis coincides with the optical axis of the collimating lens, a translucent plate located between the light source and the collimating lens at an angle to the axis of the latter and mounted on an internal cylindrical reflector in which the light source is installed, a photodetector for detecting diffusely reflected radiation located on the optical axis of the collimating lenses behind a light source, a comparison photodetector located on an axis, the point of intersection of which with the optical axis of the collimating lens lies on the floor surface a light plate from the side of the light source, a photodetector for detecting specularly reflected radiation, located on an axis, the point of intersection of which with the optical axis of the collimating lens lies on the surface of the translucent plate from the collimating lens, in order to simplify the design and improve the control accuracy, A comparison photoreceiver and a photodetector for detecting specularly reflected radiation are mounted in an internal cylindrical reflector.