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Device and method capable of detecting stripes of optical glass prefabricated member

A glass preform and optical glass technology, which is used in measuring devices, material analysis by optical means, scientific instruments, etc., can solve the problems of inability to detect aspheric pressed preforms, and achieves small occupied space, convenient operation and inspection. Efficient effect

Active Publication Date: 2015-10-14
CDGM GLASS LLC
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Problems solved by technology

Therefore, the ellipsoidal aspheric profiled preform cannot be detected by the traditional fringe detection method

Method used

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  • Device and method capable of detecting stripes of optical glass prefabricated member
  • Device and method capable of detecting stripes of optical glass prefabricated member
  • Device and method capable of detecting stripes of optical glass prefabricated member

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Embodiment Construction

[0026] Since the laser has the advantages of small beam divergence angle and good coherence, the laser is used as the light source to make the beam pass through the ellipsoidal aspheric preform to form an interference image. If there are fringes inside the preform, a fringe interference image will be formed at the focal point .

[0027] Considering the sensitive wavelength band of human eyes, the present invention preferably adopts a laser with a wavelength of 532nm, a power of 10mw, and a light exit aperture of 2mm.

[0028] Since the laser output aperture is 2mm, the diameter of the ellipsoidal aspheric preform is generally Φ5-15mm. If laser irradiation is used directly, the beam cannot completely cover the entire preform, and the fringes on the edge of the preform are difficult to observe. However, if the clear aperture of the laser is increased, since the laser beam hardly diverges, a long distance must be added between the laser light source and the preform, which does n...

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Abstract

The invention provides a stripe detection device and a stripe detection method capable of rapidly detecting the stripes of ellipsoidal aspheric pre-compressed prefabricated member. The device for detecting the stripes of the optical glass prefabricated member comprises a laser light source, a beam expanding system and a CCD image processing system in sequence according to a light path, wherein the CCD image processing system comprises a lens and a computer. According to the device, the strips at the inner part of the ellipsoidal aspheric pre-compressed prefabricated member are detected immediately through a stripe interference principle, and the relatively high detection precision can be achieved; the device structure is compact, the occupying space is small, the degree of automation is high, the resolution ratio effect is good, and the purpose of immediately rapidly detecting the stripes of the ellipsoidal aspheric pre-compressed prefabricated member can be achieved. According to the method, the glass does not need to be annealed and subjected to cold processing, a product can be detected immediately, the result can be obtained, site production process and parameters can be regulated timely, and the method can be implemented in an indoor limited space, the operation is convenient, and the detection efficiency is high.

Description

technical field [0001] The invention relates to a detection device for an optical glass preform, in particular to a stripe detection device and a detection method for an optical glass preform. Background technique [0002] The traditional optical glass stripe detection method is to first process the glass to be detected into a stripe sample, which is generally a cuboid with two parallel surfaces, grind and polish the two detection light-transmitting surfaces, and then use the projection method to detect. The device consists of three parts: light source, sample holder and screen. Since the glass stripes have a different refractive index than the matrix material, light passing through the sample is slightly refracted by the stripes. Therefore, where the stripe is in the glass, it becomes visible to the naked eye on the projection screen as a slightly darker area. This detection method requires that the glass sample must have two parallel planes, the sample length is usually ...

Claims

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Application Information

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IPC IPC(8): G01N21/84
Inventor 于天来王培新吴文进马志远
Owner CDGM GLASS LLC
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