A lens analysis method and device based on weak coherent light source interference

Abstract

The application belongs to the technical field of lens analysis, and particularly relates to a lens analysis method and device based on weak coherent light source interference, which comprises a red LED light source, a green LED light source, a blue LED light source, a blue-violet LED light source, a purple LED light source, a first collimating lens, a second collimating lens, a third collimating lens, a long-focus focusing lens, a green-transmitting red-reflection blue-trap filter, a blue-transmitting red-reflection dichroic mirror, a semi-transparent semi-reflective mirror, a precise movable lens, a Hartmann diaphragm, a plane array camera, a photoelectric detector, a photoelectric gate and a lens to be measured. The application adopts five-wavelength LED light sources, a time-sharing lighting mode, combines with the weak coherent light interference theory, scans the position with the strongest interference signal under different interfaces with a motor, realizes the analysis and measurement of the thickness, refractive index, Abbe number, optical path and blue light prevention of the measured lens, and has the advantages of simple system structure, high precision, low cost and high integration.

Description

Technical Field

[0001] The present invention belongs to the technical field of lens analysis, and in particular relates to a lens analysis method and device based on weak coherent light source interference. Background Art

[0002] The parameters of eyeglass lenses include refractive index, Abbe number, diopter and coating. Refractive index is a physical quantity that describes the change in speed of light when passing through different media. It directly affects the thickness and weight of the lens. Lenses with a high refractive index are thinner and more beautiful in appearance, but may sacrifice some visual quality. The Abbe number indicates the lens's ability to control dispersion. The higher the number, the smaller the dispersion and the better the visual quality. The Abbe number of the human eye is approximately 58, and lenses close to this number are more comfortable to wear. Refractive power includes spherical power (myopia or hyperopia), cylindrical power (astigmatism) and astigmatism axis. These parameters determine the lens' ability to correct vision. The coating is one or more layers of thin film on the surface of the lens, used to reduce reflections, improve clarity, and provide waterproof and anti-fouling functions. Different coatings can provide different visual effects and protective effects.

[0003] Currently, there are multiple methods for measuring the refractive index of lenses, broadly categorized into destructive and nondestructive testing. Destructive testing generally offers higher accuracy, with commonly used methods including the V-prism method, the minimum deviation angle method, and interferometry. Nondestructive testing is generally based on the principle of optical refraction. In recent years, there has been considerable research in China on thickness and refractive index measurement. Yan Xi et al. designed a glass thickness measurement system based on a two-path symmetrical laser transmission method to measure the thickness of glass plates, but this requires prior knowledge of the glass's refractive index. Kou Kuan et al. used terahertz time-domain spectroscopy to measure both thickness and refractive index. Zhang Jiazhen et al. proposed a method for measuring refractive index using current-tuned semiconductor lasers. Zhao Yuanyuan et al. proposed a method for simultaneously measuring glass thickness and refractive index based on spectral interferometry. Chen Kai et al. rotated a birefringent device inserted into a laser cavity, exploiting the frequency splitting effect to measure the birefringence parameters of the device at different angles. The refractive index / thickness parameters of the device were then calculated through fitting, but this approach was costly and impractical for practical application. Typical methods for truly comprehensive measurement of refractive index, Abbe number, lens thickness, and refractive power include "A Lens Refractive Index Measuring Device and Its Measurement Method, 202110479882.4" proposed by Liu Yibing and others from Ningbo Fario Optical Technology Development Co., Ltd., which uses different color LED light sources combined with dichroic beam splitting, moving Michelson moving mirror interference and scanning curvature radius to achieve measurement of refractive index, Abbe number, center thickness, and optical path, but the system structure is complex; "A Lens Multi-Parameter Comprehensive Measurement Method and Device Based on Michelson Interference, 202410526823.1" proposed by North University of China uses four-color LED light sources, combined with a four-in-one fiber optic combiner and Michelson interference to achieve multi-parameter measurement of lenses. The system structure is simple, but due to the coupling efficiency problem of the four-in-one fiber optic combiner, energy loss is serious, resulting in limited measurable lenses, especially colored glasses and polarized glasses are difficult to measure. Summary of the Invention

[0004] In response to the technical problems of the above-mentioned existing lens measurement systems, such as complexity, single measurement parameters, limited measurable lenses and high cost, the present invention provides a lens analysis method and device based on weak coherent light source interference. Lens analysis is performed based on the interference of five-wavelength LED weak coherent light sources, and real-time comprehensive multi-parameter measurements of lens refractive index, Abbe number, lens thickness, optical path, refractive power, and blue light protection are performed.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A lens analysis device based on weak coherent light source interference includes a red LED light source, a green LED light source, a blue LED light source, a blue-violet LED light source, a violet LED light source, a first quasi-true lens, a second collimating lens, a third collimating lens, a telephoto focusing lens, a green-transmitting, red-reflecting, and blue-reflecting trap filter, a blue-transmitting, red-reflecting dichroic mirror, a semi-transparent, semi-reflecting mirror, a precision movable lens, a Hartmann diaphragm, an area array camera, a photodetector, a photoelectric gate, and a lens to be tested. The second collimating lens is arranged in the optical path direction of the red LED light source, the first quasi-true lens is arranged in the optical path direction of the green LED light source, the third collimating lens is arranged in the optical path direction of the blue LED light source, the blue-transmitting, red-reflecting dichroic mirror is arranged in the optical paths of the second and third collimating lenses, a telephoto focusing lens is arranged in the optical path direction of the blue-transmitting, red-reflecting, and blue-reflecting trap filter, and the green-transmitting, red-reflecting, and blue-reflecting trap filter is arranged in the optical path direction of the first quasi-true lens.

[0007] A semi-transparent and semi-reflective mirror is arranged in the light path direction of the green-transmitting and red-reflecting blue trap filter, the semi-transparent and semi-reflective mirror is arranged in the light path direction of the blue-violet LED light source, the purple LED light source and the photodetector, a precision movable lens is arranged in the light path direction of the blue-violet LED light source and the purple LED light source transmitting the semi-transparent and semi-reflective mirror, a lens to be tested is arranged in the light path direction of the blue-violet LED light source and the purple LED light source reflecting the semi-transparent and semi-reflective mirror, a photoelectric gate is arranged between the semi-transparent and semi-reflective mirror and the precision movable lens, a Hartmann diaphragm is arranged in the light path direction of the lens to be tested, and an area array camera is arranged in the light path direction of the Hartmann diaphragm.

[0008] The Hartmann aperture includes a light shield, a first light hole and a second light hole. The second light holes are evenly distributed on the light shield, and the first light hole is arranged at the center of the light shield.

[0009] The central wavelength λ1 of the red LED light source ranges from 610nm to 670nm, the central wavelength λ2 of the green LED light source ranges from 500nm to 550nm, the central wavelength λ3 of the blue LED light source ranges from 450nm to 480nm, the central wavelength λ4 of the blue-violet LED light source ranges from 440nm to 460nm, and the central wavelength λ5 of the purple LED light source ranges from 410nm to 430nm. The spectral widths of the red LED light source, the green LED light source, the blue LED light source, the blue-violet LED light source and the purple LED light source are all less than 60nm.

[0010] The left surface of the precise movable lens is a smooth surface, and the right surface is a rough surface. The smooth surface of the precise movable lens faces the semi-transparent and semi-reflective mirror.

[0011] The diameter of the first light-through hole in the Hartmann diaphragm ranges from 0.5 mm to 1.0 mm, the diameter of the second light-through hole ranges from 0.2 mm to 0.5 mm, and the number of the second light-through holes is no less than 9*9.

[0012] An analysis method for a lens analysis device based on weak coherent light source interference comprises the following steps:

[0013] S1. After powering on, initialize without placing the lens to be tested:

[0014] S2, put the lens to be tested into the test chamber;

[0015] S3. Calculate the thickness, refractive index, Abbe number, optical path, and blue light protection of the lens to be tested.

[0016] The method for initialization in S1 is:

[0017] S1.1. Turn on the red LED light source, and the precision movable lens moves from right to left. When it passes the photoelectric gate, the calculation begins. When the photoelectric detector obtains the strongest interference signal of the red LED light source corresponding to the zero optical path difference of the upper and lower surfaces of the Hartmann diaphragm, the corresponding positions of the precision movable lens are x 10 and x1'0;

[0018] S1.2, bright blue LED light source, the precision movable lens wants to move from left to right, through the photoelectric detector photoelectric signal and photoelectric gate signal, obtain the blue LED light source zero optical path difference interference strongest signal position and the photoelectric gate position, based on the photoelectric gate trigger position reverse calculation, the corresponding precision movable lens position is x 30 and x' 30 ;

[0019] S1.3, bright blue-violet LED light source, the area array camera collects the light intensity I of the blue-violet LED light source on the area array camera 40 ;

[0020] S1.4, turn on the purple LED light source, and the area array camera collects the light intensity I of the purple LED light source on the area array camera 50 .

[0021] The method of placing the lens to be tested in S2 for testing is as follows:

[0022] S2.1. Turn on the green LED light source. The area array camera captures the spot distribution of the quasi-true green light after it passes through the Hartmann aperture 14 and is reflected on the area array camera 15.

[0023] S2.2. Turn on the red LED light source and move the precision movable lens from right to left. When it passes the photoelectric gate, start counting. When the photoelectric detector obtains the strongest interference signal of the zero optical path difference between the lower surface of the Hartmann diaphragm, the upper surface of the Hartmann diaphragm, and the reflection of the upper and lower surfaces of the lens to be tested, the position of the precision movable lens at this time is recorded as x. 11 、x 12 、x 13 and x 14 ;

[0024] S2.3, with a bright blue LED light source, the precision movable lens moves from left to right. Through the photoelectric signal of the photodetector and the photoelectric gate signal, different surfaces obtain the position of the strongest interference signal of the blue LED light source with zero optical path difference and the position passing through the photoelectric gate in turn. Based on this photoelectric gate trigger position, reverse calculation is performed to obtain the strongest interference signal of zero optical path difference of the upper surface of the Hartmann diaphragm, the lower surface of the Hartmann diaphragm, the reflection of the lower surface and the reflection of the upper surface of the lens to be tested, and the position of the precision movable lens at this time is recorded as x 31 、x 32 、x 33 and x 34 ;

[0025] S2.4, bright blue-violet LED light source, the area array camera collects the light intensity I of the blue-violet LED light source on the area array camera 41 ;

[0026] S2.5, turn on the purple LED light source, and the area array camera collects the light intensity I of the purple LED light source on the area array camera 51 .

[0027] The method for calculating the thickness, refractive index, Abbe number, optical length, and blue light protection of the lens to be tested in S3 is:

[0028] The optical path lengths of the tested lenses with different colors of red and blue LEDs and the changes in optical path lengths before and after placement are as follows:

[0029]

[0030] Where d is the center thickness of the lens to be tested, n1 is the refractive index of the lens to be tested at the center wavelength of red LED light source 1, and n3 is the refractive index of the lens to be tested at the center wavelength of blue LED light source 3. The center thickness d, refractive indices n1 and n3 of the lens to be tested are then:

[0031]

[0032] According to the regulations, the refractive index n of the lens to be tested is the refractive index corresponding to the wavelength of 546.07nm. Based on the above data, the formula for the refractive index n is: The formula for optical path L is: L=nd, and the formula for Abbe number v is: in Where a, b, c, e and k are fixed constant coefficients, which are related to the central wavelength of the red LED light source and the central wavelength of the blue LED light source 3;

[0033] Then the blue-violet light transmittance T4 and the violet light transmittance T5 of the lens to be tested are obtained as follows: and

[0034]

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention adopts a five-wavelength LED light source, a time-sharing lighting mode, and combines the theory of weak coherent light interference. The motor scans the position of the strongest interference signal under zero optical path difference on different interfaces to achieve analytical measurement of the thickness, refractive index, Abbe number, optical path, blue light protection, etc. of the measured lens. The entire system has a simple structure, high precision, low cost, and high integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0038] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons skilled in the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0039] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 Schematic diagram of the Hartmann diaphragm structure of the present invention.

[0041] Among them: 1 is a red LED light source, 2 is a green LED light source, 3 is a blue LED light source, 4 is a blue-violet LED light source, 5 is a violet LED light source, 6 is a first quasi-true lens, 7 is a second collimating lens, 8 is a third collimating lens, 9 is a telephoto focusing lens, 10 is a green-transmitting, red-reflecting, and blue-trap filter, 11 is a blue-transmitting, red-reflecting dichroic mirror, 12 is a semi-transparent, semi-reflecting mirror, 13 is a precision movable lens, 14 is a Hartmann aperture, 14-1 is a bracket shield, 14-2 is a first light hole, 14-3 is a second light hole, 15 is an area array camera, 16 is a photodetector, 17 is a photogate, and 18 is a lens to be tested. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all the embodiments. These descriptions are only to further illustrate the features and advantages of the present invention, rather than to limit the claims of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0043] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0046] A lens analysis device based on weak coherent light source interference, such as Figure 1As shown, it includes a red LED light source 1, a green LED light source 2, a blue LED light source 3, a blue-violet LED light source 4, a violet LED light source 5, a first collimating lens 6, a second collimating lens 7, a third collimating lens 8, a telephoto focusing lens 9, a green-transmitting, red-reflecting, and blue-trapping filter 10, a blue-transmitting, red-reflecting dichroic mirror 11, a semi-transparent and semi-reflective mirror 12, a precision movable lens 13, a Hartmann aperture 14, an area array camera 15, a photodetector 16, a photoelectric gate 17, and a lens to be tested 18. The second collimating lens 7 is arranged at the red LED light source. 1, a first quasi-true lens 6 is arranged in the optical path direction of the green LED light source 2, a third collimating lens 8 is arranged in the optical path direction of the blue LED light source 3, a blue-transmitting and red-reflecting dichroic mirror 11 is arranged in the optical path direction of the second collimating lens 7 and the third collimating lens 8, a telephoto focusing lens 9 is arranged in the optical path direction of the blue-transmitting and red-reflecting dichroic mirror 11, a green-transmitting and red-reflecting blue trap filter 10 is arranged in the optical path direction of the telephoto focusing lens 9, and the green-transmitting and red-reflecting blue trap filter 10 is arranged in the optical path direction of the first quasi-true lens 6. A semi-transparent and semi-reflective mirror 12 is arranged in the optical path direction of the green-transmitting and red-reflecting blue trap filter 10. The semi-transparent and semi-reflective mirror 12 is arranged in the optical path direction of the blue-violet LED light source 4, the purple LED light source 5 and the photodetector 16. A precision movable lens 13 is arranged in the optical path direction of the blue-violet LED light source 4 and the purple LED light source 5 transmitting the semi-transparent and semi-reflective mirror 12. A lens to be tested 18 is arranged in the optical path direction of the blue-violet LED light source 4 and the purple LED light source 5 reflecting the semi-transparent and semi-reflective mirror 12. A photoelectric gate 17 is arranged between the semi-transparent and semi-reflective mirror 12 and the precision movable lens 13. A Hartmann diaphragm 14 is arranged in the optical path direction of the lens to be tested 18. An area array camera 15 is arranged in the optical path direction of the Hartmann diaphragm 14.

[0047] Further, preferably, the center wavelength λ1 of the red LED light source 1 is in the range of 610nm-670nm, the center wavelength λ2 of the green LED light source 2 is in the range of 500nm-550nm, the center wavelength λ3 of the blue LED light source 3 is in the range of 450nm-480nm, the center wavelength λ4 of the blue-violet LED light source 4 is in the range of 440nm-460nm, and the center wavelength λ5 of the purple LED light source 5 is in the range of 410nm-430nm. The spectral widths of the red LED light source 1, the green LED light source 2, the blue LED light source 3, the blue-violet LED light source 4 and the purple LED light source 5 are all less than 60nm.

[0048] Further, if Figure 2 As shown, the Hartmann aperture 14 includes a light shield 14-1, a first light hole 14-2 and a second light hole 14-3. The second light holes 14-3 are evenly distributed on the light shield 14-1, and the first light hole 14-2 is set at the center of the light shield 14-1.

[0049] Furthermore, the quasi-true lens 6 converts the light of the green LED light source 2 into parallel light, the collimating lens 7 converts the light of the red LED light source 1 into parallel light, the collimating lens 8 converts the light of the blue LED light source 3 into parallel light, and the telephoto focusing lens 9 focuses the light of the red LED light source 1 and the blue LED light source 3 into the Hartmann aperture 9.

[0050] Furthermore, the left surface of the precision movable lens 13 is a smooth surface, and the right surface is a rough surface. The smooth surface of the precision movable lens 13 faces the semi-transparent and semi-reflective mirror 12. The precision movable lens 13 does not use total reflection in order to improve the contrast of the weak coherent interference signals of the upper and lower surfaces of the lens to be measured 18 and the upper and lower surfaces of the Hartmann aperture 14. The rough surface is to prevent the reflection of the surface from interfering with the measurement.

[0051] Further, preferably, the diameter of the first light holes 14 - 2 in the Hartmann aperture 14 is in the range of 0.5 mm to 1.0 mm, the diameter of the second light holes 14 - 3 is in the range of 0.2 mm to 0.5 mm, and the number of the second light holes 14 - 3 is not less than 9*9.

[0052] Furthermore, the green-transmitting, red-reflecting, and blue-repelling trap filter 10 ensures that the light from the green LED light source 2 has a high transmittance, and the light from the red LED light source 1 and the blue LED light source 3 has a high reflectance, and the blue-transmitting, red-reflecting dichroic mirror 11 ensures that the light from the red LED light source 1 has a high reflectance, and the light from the blue LED light source 3 has a high transmittance.

[0053] Furthermore, the precise movable mirror 13 moves from right to left or from left to right using the photoelectric gate 17 as a trigger as a reference position.

[0054] The specific measurement method is as follows:

[0055] 1. After the device is powered on, initialize it without placing the lens to be tested 18:

[0056] 1) When the red LED light source 1 is on, the precision movable lens 13 moves from right to left and passes the photoelectric gate 17, the calculation starts. When the photoelectric detector 16 obtains the strongest interference signal of the red LED light source 1 corresponding to the zero optical path difference of the upper and lower surfaces of the Hartmann diaphragm 14, the corresponding positions of the precision movable lens 13 are x 10 and x1'0.

[0057] 2) When the blue LED light source 3 is on, the precision movable lens 13 moves from left to right. The position of the strongest signal of the zero optical path difference interference of the blue LED light source 3 and the position of the photogate 17 are obtained in sequence through the photoelectric signal of the photodetector 16 and the signal of the photogate 17. The trigger position of the photogate 17 is reversely calculated, and the corresponding positions of the precision movable lens 13 are x and x respectively. 30 and x' 30.

[0058] 3) Turn on the blue-violet LED light source 4, and the area array camera 15 collects the light intensity I of the blue-violet LED light source 4 at the area array camera 15 40 .

[0059] 4) Turn on the purple LED light source 5, and the area array camera 15 collects the light intensity I of the purple LED light source 5 at the area array camera 15 50 .

[0060] 2. When the lens to be tested is placed:

[0061] 1) The green LED light source 2 is turned on, and the area array camera 15 collects the spot distribution of the quasi-true green light after passing through the Hartmann aperture 14 on the area array camera 15.

[0062] 2) When the red LED light source 1 is on, the precision movable lens 13 moves from right to left and passes through the photoelectric gate 13, the calculation begins. When the photoelectric detector 16 obtains the strongest interference signal of the zero optical path difference of the upper surface of the Hartmann diaphragm 14, the lower surface of the Hartmann diaphragm 14, the lower surface of the test lens 18, and the upper surface reflection, the position of the precision movable lens 13 at this time is recorded as x 11 、x 12 、x 13 and x 14 .

[0063] 3) Turn on the blue LED light source 3, and move the precision movable lens 13 from left to right. Through the photoelectric signal of the photodetector 16 and the signal of the photoelectric gate 17, different surfaces obtain the position of the strongest signal of the zero optical path difference interference of the blue LED light source 3 and the position passing through the photoelectric gate 17 in turn. Based on the trigger position of the photoelectric gate 17, reverse calculation is performed to obtain the strongest interference signal of the zero optical path difference reflected by the upper surface of the Hartmann aperture 14, the lower surface of the Hartmann aperture 14, and the lower and upper surfaces of the lens to be tested 18. The position of the precision movable lens 13 at this time is recorded as x 31 、x 32 、x 33 and x 34 .

[0064] 4) The blue-violet LED light source 4 is turned on, and the area array camera 15 collects the light intensity I of the blue-violet LED light source 4 at the area array camera 15 41 .

[0065] 5) Turn on the purple LED light source 5, and the area array camera 15 collects the light intensity I of the purple LED light source 5 at the area array camera 15 51 .

[0066] The diopter of the lens to be tested 18 can be obtained in a traditional way based on the image of the area array camera 15 after the Hartmann diaphragm 14 is placed before and after the lens.

[0067] According to the above data, the optical path of the red LED and blue LED test lens 18 with different colors and the optical path changes before and after placement are as follows:

[0068]

[0069] Where d is the center thickness of the lens 18 to be tested, n1 is the refractive index of the lens 18 to be tested at the center wavelength of the red LED light source 1, and n3 is the refractive index of the lens 18 to be tested at the center wavelength of the blue LED light source 3. The center thickness d, refractive indices n1 and n3 of the lens 18 to be tested are:

[0070]

[0071] According to the regulations, the refractive index n of the lens 18 to be tested is the refractive index corresponding to the wavelength of 546.07nm. Based on the above data, as an optimal formula, the refractive index n is: The formula for optical path L is: L=nd, and the formula for Abbe number v is: in Wherein, a, b, c, e and k are fixed constant coefficients, which are related to the central wavelength of the red LED light source 1 and the central wavelength of the blue LED light source 3 .

[0072] The blue-violet light transmittance T4 and the violet light transmittance T5 of the lens 18 to be tested are and

[0073] The above only describes in detail the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the scope of protection of the present invention.

Claims

1. A lens analysis device based on weak coherent light source interference, characterized by: It includes a red LED light source (1), a green LED light source (2), a blue LED light source (3), a blue-violet LED light source (4), a violet LED light source (5), a first quasi-true lens (6), a second collimating lens (7), a third collimating lens (8), a telephoto focusing lens (9), a green-transmitting, red-reflecting, and blue-reflecting trap filter (10), a blue-transmitting, red-reflecting dichroic mirror (11), a semi-transparent, semi-reflective mirror (12), a precision movable lens (13), a Hartmann aperture (14), a surface array camera (15), a photodetector (16), a photoelectric gate ( 17) and a lens to be tested (18), the second collimating lens (7) is arranged in the light path direction of the red light LED light source (1), the first collimating lens (6) is arranged in the light path direction of the green light LED light source (2), the third collimating lens (8) is arranged in the light path direction of the blue light LED light source (3), the blue-transmitting and red-reflecting dichroic mirror (11) is arranged in the light path direction of the second collimating lens (7) and the third collimating lens (8), and a telephoto focusing lens (9) is arranged in the light path direction of the blue-transmitting and red-reflecting dichroic mirror (11) A green-transmitting, red-reflecting, and blue-reflecting trap filter (10) is provided in the optical path direction of the telephoto focusing lens (9), and the green-transmitting, red-reflecting, and blue-reflecting trap filter (10) is provided in the optical path direction of the first quasi-true lens (6); a semi-transmitting, semi-reflecting mirror (12) is provided in the optical path direction of the green-transmitting, red-reflecting, and blue-reflecting trap filter (10), and the semi-transmitting, semi-reflecting mirror (12) is provided in the optical path direction of the blue-violet LED light source (4), the purple LED light source (5), and the photodetector (16), and the blue-violet LED light source (4) and the purple LED light source ( 5) A precision movable lens (13) is provided in the direction of the light path of the semi-transparent and semi-reflective mirror (12), a lens to be tested (18) is provided in the direction of the light path of the blue-violet LED light source (4) and the purple LED light source (5) reflecting the semi-transparent and semi-reflective mirror (12), a photoelectric gate (17) is provided between the semi-transparent and semi-reflective mirror (12) and the precision movable lens (13), a Hartmann diaphragm (14) is provided in the direction of the light path of the lens to be tested (18), and a surface array camera (15) is provided in the direction of the light path of the Hartmann diaphragm (14).

2. The lens analysis device based on weak coherent light source interference according to claim 1, characterized in that: The Hartmann aperture (14) comprises a light shield (14-1), a first light through hole (14-2) and a second light through hole (14-3), wherein the second light through holes (14-3) are evenly distributed on the light shield (14-1), and the first light through hole (14-2) is arranged at the center of the light shield (14-1).

3. The lens analysis device based on weak coherent light source interference according to claim 1, characterized in that: The central wavelength of the red LED light source (1) The central wavelength of the green LED light source (2) is in the range of 610nm-670nm. The central wavelength of the blue LED light source (3) is in the range of 500nm-550nm. The central wavelength of the blue-violet LED light source (4) is in the range of 450nm-480nm. The central wavelength of the purple LED light source (5) is in the range of 440nm-460nm. The range is 410nm-430nm, and the spectral widths of the red LED light source (1), the green LED light source (2), the blue LED light source (3), the blue-violet LED light source (4), and the violet LED light source (5) are all less than 60nm.

4. The lens analysis device based on weak coherent light source interference according to claim 1, characterized in that: The left surface of the precision movable lens (13) is a smooth surface, and the right surface is a rough surface. The smooth surface of the precision movable lens (13) faces the semi-transparent and semi-reflective mirror (12).

5. The lens analysis device based on weak coherent light source interference according to claim 2, characterized in that: The diameter range of the first light-through hole (14-2) in the Hartmann aperture (14) is 0.5 mm-1.0 mm, the diameter range of the second light-through hole (14-3) is 0.2 mm-0.5 mm, and the number of the second light-through holes (14-3) is not less than 9*9.

6. The analysis method of a lens analysis device based on weak coherent light source interference according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. After powering on the machine, without placing the lens to be tested (18), perform initialization: S2, inserting the lens to be tested (18) for testing; S3. Calculate and obtain the thickness, refractive index, Abbe number, optical path, and blue light protection of the lens to be tested (18).

7. The analysis method of the lens analysis device based on weak coherent light source interference according to claim 6, characterized in that: The method for initialization in S1 is: S1.1, when the red LED light source (1) is bright, the precision movable lens (13) moves from right to left and passes through the photoelectric gate (17), the calculation starts. When the photoelectric detector (16) obtains the strongest interference signal of the red LED light source (1) corresponding to the upper and lower surfaces of the Hartmann aperture (14) with zero optical path difference, the positions of the corresponding precision movable lens (13) are respectively and ; S1.2, bright blue LED light source (3), the precision movable lens (13) moves from left to right, and the photoelectric signal of the photodetector (16) and the photoelectric gate (17) signal are used to obtain the position of the strongest signal of the zero optical path difference interference of the blue LED light source (3) and the position of the photoelectric gate (17) in turn. The trigger position of the photoelectric gate (17) is used for reverse calculation, and the corresponding positions of the precision movable lens (13) are respectively and ; S1.3, bright blue-violet LED light source (4), the array camera (15) collects the light intensity of the blue-violet LED light source (4) on the array camera (15) ; S1.4, turn on the purple LED light source (5), and the array camera (15) collects the light intensity of the purple LED light source (5) on the array camera (15) .

8. The analysis method of a lens analysis device based on weak coherent light source interference according to claim 6, characterized in that: The method for placing the lens to be tested (18) in S2 for testing is as follows: S2.1, bright green LED light source (2), the array camera (15) collects the spot distribution of the quasi-true green light after passing through the Hartmann aperture (14) on the array camera (15); S2.2, when the red LED light source (1) is on, the precision movable lens (13) moves from right to left and passes through the photoelectric gate (17), the calculation starts. When the photoelectric detector (16) obtains the strongest interference signal of the zero optical path difference of the upper surface of the Hartmann diaphragm (14), the lower surface of the Hartmann diaphragm (14), the lower surface of the lens to be tested (18) and the upper surface reflection, the position of the precision movable lens (13) at this time is recorded as follows: 、 、 and ; S2.3, bright blue LED light source (3), the precision movable lens (13) moves from left to right, through the photoelectric signal of the photoelectric detector (16) and the photoelectric gate (17), different surfaces obtain the strongest signal position of the zero optical path difference interference of the blue LED light source (3) and the position passing through the photoelectric gate (17), and reversely calculate the trigger position of the photoelectric gate (17) to obtain the strongest signal of the zero optical path difference interference of the upper surface of the Hartmann diaphragm (14), the lower surface of the Hartmann diaphragm (14), the lower surface of the test lens (18) and the upper surface reflection, and record the position of the precision movable lens (13) at this time. 、 、 and ; S2.4, bright blue-violet LED light source (4), the array camera (15) collects the light intensity of the blue-violet LED light source (4) on the array camera (15) ; S2.5, turn on the purple LED light source (5), and the array camera (15) collects the light intensity of the purple LED light source (5) at the array camera (15) .

9. The analysis method of a lens analysis device based on weak coherent light source interference according to claim 6, characterized in that: The method for calculating the thickness, refractive index, Abbe number, optical path, and blue light protection of the lens to be tested (18) in S3 is: The optical path of the red LED and blue LED test lens (18) with different colors and the optical path changes before and after placement are as follows: Wherein, d is the center thickness of the lens to be tested (18), n1 is the refractive index of the lens to be tested (18) at the center wavelength of the red LED light source 1, and n3 is the refractive index of the lens to be tested (18) at the center wavelength of the blue LED light source 3. The center thickness d, refractive indices n1 and n3 of the lens to be tested (18) are obtained as follows: According to the regulations, the refractive index n of the lens to be tested (18) is the refractive index corresponding to the wavelength of 546.07nm. Based on the above data, the formula for the refractive index n is: , the formula for optical path L is: , the formula for the Abbe number v is: ,in ; Wherein a, b, c, e and k are fixed constant coefficients, which are related to the central wavelength of the red LED light source (1) and the central wavelength of the blue LED light source 3; Then the blue-violet light transmittance of the lens (18) to be tested is obtained and violet light transmittance They are and .

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