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
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[0026] Because the laser has the advantages of small beam divergence and good coherence, the laser is used as the light source to make the beam pass through the ellipsoidal aspherical 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 the human eye, the present invention preferably uses a laser with a wavelength of 532 nm, a power of 10 mw, and a light exit aperture of 2 mm.
[0028] Since the laser exit aperture is 2mm, the diameter of the ellipsoidal aspherical preform is generally Φ5-15mm. If the laser is used directly, the beam cannot completely cover the entire preform, and it is difficult to observe the edge fringes of the preform. 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 source and the preform, which does not meet the needs of a...
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