CN-116045831-B - Lens gluing gap monitoring method and device, control terminal and storage medium

CN116045831BCN 116045831 BCN116045831 BCN 116045831BCN-116045831-B

Abstract

The invention relates to the field of gap measurement and discloses a lens bonding gap monitoring method, a device, a control terminal and a storage medium, wherein the method comprises the steps of injecting incident light into a lens to be bonded and receiving interference light formed by reflection of the upper surface and the lower surface of a bonding layer of the lens to be bonded; and acquiring the wavelength and the light intensity of the interference light, and calculating the distance between the bonding layers on the incidence point of the incident light according to the wavelength and the light intensity. The distance between the incident points is directly acquired through the reflected light, so that the whole measuring process is simple and rapid, high requirements on measuring instruments are not required, the measuring cost is reduced, the method can adapt to the testing requirements of various lenses, and the testing difficulty is simplified.

Inventors

LIU AIJIANG
HUANG JIXIN
ZHANG MENG

Assignees

深圳市杰普特光电股份有限公司

Dates

Publication Date: 20260512
Application Date: 20220909

Claims (8)

1. A method for monitoring a lens bonding gap, comprising: Incident light is injected into the lens to be glued, and interference light formed by reflection of the upper surface and the lower surface of the gluing layer of the lens to be glued is received; acquiring the wavelength and the light intensity of the interference light, and calculating the distance between the bonding layers on the incidence point of the incident light according to the wavelength and the light intensity; The interference light includes a first reflected light and a second reflected light; The first reflected light is light reflected by the incident light on the upper surface, the second reflected light is light reflected by the incident light, the incident light is transmitted through the upper surface and then reflected by the lower surface, and the interference light is formed by mutual interference of the first reflected light and the second reflected light; The periodic function expression of the light intensity and the wave vector is as follows: I(k)=I 1 2 + I 2 2 +2(I 1 2 *I 2 2 ) 1/2 cos(k*2h) Wherein I is the light intensity of the interference light, I 1 is the light intensity of the first reflected light, I 2 is the light intensity of the second reflected light, k is the wave vector, and h is the spacing of the bonding layers.
2. The method of claim 1, wherein the injecting incident light into the lens to be glued comprises: and through a change-over switch, the incident light vertically irradiates into different points on the upper surface of the bonding layer through different optical fibers.
3. The method of claim 1, wherein the calculating the pitch of the glue layer at the point of incidence of the incident light comprises: according to the light intensity and the wavelength, a periodic function which is satisfied by the light intensity and the wave vector is obtained; and carrying out Fourier transformation on the periodic function to obtain a frequency spectrum curve, and determining the spacing of the glue layers through the peak value of the frequency spectrum curve after transformation.
4. The method for monitoring a lens bonding gap according to claim 3, wherein the calculating the pitch of the bonding layer further comprises: If the data points in the periodic function are insufficient, adding the data points through interpolation operation before carrying out Fourier transformation.
5. The lens gluing gap monitoring device is characterized by comprising a light source, a spectrometer, an optical fiber and a collimator; the collimator is used for receiving the light emitted by the light source through the optical fiber and emitting the light into the lens to be glued after collimation; The spectrometer is used for receiving interference light reflected by the upper surface and the lower surface of the lens gluing layer to be glued; the spectrometer is also used for acquiring the wavelength and the light intensity of the interference light through the optical fiber, and calculating the distance between the bonding layers on the incidence point of the incident light according to the wavelength and the light intensity; The interference light includes a first reflected light and a second reflected light; The first reflected light is light reflected by the incident light on the upper surface, the second reflected light is light reflected by the incident light, the incident light is transmitted through the upper surface and then reflected by the lower surface, and the interference light is formed by mutual interference of the first reflected light and the second reflected light; The periodic function expression of the light intensity and the wave vector is as follows: I(k)=I 1 2 + I 2 2 +2(I 1 2 *I 2 2 ) 1/2 cos(k*2h) Wherein I is the light intensity of the interference light, I 1 is the light intensity of the first reflected light, I 2 is the light intensity of the second reflected light, k is the wave vector, and h is the spacing of the bonding layers.
6. The lens bonding gap monitoring device according to claim 5, further comprising a switch and an optical fiber connector, the optical fiber comprising two spectroscopic optical fibers; The light splitting optical fiber comprises a plurality of light splitting optical paths which are respectively connected with the collimator, wherein a first light splitting optical fiber is used for connecting the light source with the collimator through the change-over switch, and a second light splitting optical fiber is connected with the spectrometer through the optical fiber connector; The first light splitting optical fiber and the second light splitting optical fiber are Y-shaped light splitting optical fibers 1*N, and N is more than or equal to 2 and less than or equal to 9.
7. A control terminal comprising a processor and a memory, the memory storing a computer program which, when run on the processor, performs the lens bonding gap monitoring method of any one of claims 1 to 4.
8. A readable storage medium, characterized in that it stores a computer program which, when run on a processor, performs the lens gluing gap monitoring method of any one of claims 1 to 4.

Description

Lens gluing gap monitoring method and device, control terminal and storage medium Technical Field The present invention relates to the field of gap measurement, and in particular, to a method and apparatus for monitoring a lens bonding gap, a control terminal, and a storage medium. Background The lens is one of the most basic optical elements in an optical system. Today, domestic lenses and industrial lenses have extremely high performance pursuit, and imaging quality is used as the most important measure of lens performance, and the requirements are also higher and higher. However, the gap width between lenses directly affects the imaging quality, and slight assembly errors may cause a dramatic drop in the modulation transfer function for the entire lens assembly. Moreover, today's imaging systems have widely used aspherical mirrors to correct aberrations and improve imaging quality and simplify optical structures. However, aspherical mirrors further lead to irregular inter-mirror distance variations compared to spherical mirrors, which requires multipoint measurement techniques to achieve accurate assembly. Therefore, it is necessary to design a measuring method and device capable of measuring the lens gap width at a plurality of points at the same time with high accuracy. Disclosure of Invention In a first aspect, the present application provides a method for monitoring a lens bonding gap, comprising: Incident light is injected into the lens to be glued, and interference light formed by reflection of the upper surface and the lower surface of the gluing layer of the lens to be glued is received; And acquiring the wavelength and the light intensity of the interference light, and calculating the distance between the bonding layers on the incidence point of the incident light according to the wavelength and the light intensity. Further, the injecting the incident light into the lens to be glued further includes: and through a change-over switch, the incident light vertically irradiates into different points on the upper surface of the bonding layer through different optical fibers. Further, the interference light includes a first reflected light and a second reflected light; The first reflected light is light reflected by the incident light on the upper surface, the second reflected light is light reflected by the incident light, the incident light passes through the upper surface and then is reflected by the lower surface, and the interference light is formed by mutual interference of the first reflected light and the second reflected light. Further, the calculating the pitch of the glue layer at the incident point of the incident light includes: according to the light intensity and the wavelength, a periodic function which is satisfied by the light intensity and the wave vector is obtained; and carrying out Fourier transformation on the periodic function to obtain a frequency spectrum curve, and determining the spacing of the glue layers through the peak value of the frequency spectrum curve after transformation. Further, when calculating the spacing of the glue layers, the method further includes: If the data points in the periodic function are insufficient, adding the data points through interpolation operation before carrying out Fourier transformation. Further, the periodic function expression of the light intensity and the wave vector is as follows: I(k)＝I12+I22+2(I12*I22)1/2cos(k*2h) Wherein I is the light intensity of the interference light, I 1 is the light intensity of the first reflected light, I 2 is the light intensity of the second reflected light, k is the wave vector, and h is the spacing of the bonding layers. In a second aspect, the application also provides a lens gluing gap monitoring device, which comprises a light source, a spectrometer, an optical fiber and a collimator; the collimator is used for receiving the light emitted by the light source through the optical fiber and emitting the light into the lens to be glued after collimation; The spectrometer is used for receiving interference light reflected by the upper surface and the lower surface of the lens gluing layer to be glued; The spectrometer is also used for acquiring the wavelength and the light intensity of the interference light through the optical fiber, and calculating the distance between the bonding layers on the incidence point of the incident light according to the wavelength and the light intensity. Further, the fiber-optic cable also comprises a change-over switch and a fiber-optic connector, wherein the fiber-optic cable comprises two light-splitting fiber; The light splitting optical fiber comprises a plurality of light splitting optical paths which are respectively connected with the collimator, wherein a first light splitting optical fiber is used for connecting the light source with the collimator through the change-over switch, and a second light splitting optical fiber is connected with the spectrometer thro