Lens analysis method and device based on weak coherent light source interference

Abstract

The invention 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. Comprising a red light LED light source, a green light LED light source, a blue light LED light source, a blue-violet light LED light source, a violet light LED light source, a first quasi-true lens, a second collimating lens, a third collimating lens, a long-focus focusing lens, a green-transmitting red-blue-reflecting trap optical filter, a blue-transmitting red-reflecting dichroscope, a semi-transmitting semi-reflecting mirror, a precise movable lens, a Hartmann diaphragm, an area-array camera, a photoelectric detector, a photoelectric door and a lens to be detected. According to the invention, LED light sources with five wavelengths are adopted, a time-sharing lightening mode is adopted, a weak coherent light interference theory is combined, positions with strongest interference signals under zero optical path difference of different interfaces are scanned through a motor, analysis and measurement of thickness, refractive index, Abbe number, optical path, blue light prevention and the like of a measured lens are realized, and the whole system is simple in structure, high in precision, low in cost and high in integration level.

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 film layer. 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 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 value, the smaller the dispersion and the better the visual quality. The Abbe number of the human eye is about 58, and lenses close to this value are more comfortable to wear. Diopter includes spherical power (myopia or hyperopia), cylindrical power (astigmatism) and astigmatism axis. These parameters determine the lens' ability to correct vision. The film layer is one or more layers of thin film on the surface of the lens, which is used to reduce reflections, improve clarity, and provide waterproof and anti-fouling functions. Different film layers can provide different visual effects and protective effects.

[0003] At present, there are many methods to measure the refractive index of lenses, mainly destructive and non-destructive testing. Destructive testing is generally more accurate, and the commonly used methods include V-prism method, minimum deviation angle method and interference method. Non-destructive testing is generally based on the principle of optical refraction. In recent years, there have been many studies on thickness and refractive index measurement in China. Yan Xi and others designed a glass thickness measurement system based on the laser two-way symmetrical transmission method to measure the thickness of glass plates, but the refractive index of the glass must be known in advance. Kou Kuan and others used terahertz time-domain spectroscopy to measure thickness and refractive index. Zhang Jiazhen and others proposed a method for measuring refractive index, which uses current-tuned semiconductor lasers. Zhao Yuanyuan and others proposed a method that can simultaneously measure glass thickness and refractive index based on spectral interferometry technology. Chen Kai and others rotated the birefringent device inserted into the laser cavity, used the frequency splitting effect to measure the birefringence parameters of the device at different angles, and obtained the refractive index / thickness parameters of the device by fitting calculation, but the cost is high and cannot be applied in practice. Typical methods for truly comprehensive measurement of refractive index, Abbe number, lens thickness, and refractive power include "A lens refractive index measurement 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 a four-color LED light source, combined with a four-in-one fiber optic combiner and Michelson interference, to achieve multi-parameter measurement of lenses. The system has a simple structure, 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 being complex, 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, which performs lens analysis based on five-wavelength LED weak coherent light source interference, and performs real-time comprehensive multi-parameter measurement of lens refractive index, Abbe number, lens thickness, optical path, refractive power, and blue light protection.

[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 comprises 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 aperture, an array camera, a photodetector, a photoelectric gate, and a lens to be tested, wherein the second collimating lens is arranged in the light path direction of the red LED light source, the first quasi-true lens is arranged in the light path direction of the green LED light source, the third collimating lens is arranged in the light path direction of the blue LED light source, the blue-transmitting, red-reflecting dichroic mirror is arranged in the light path direction of the second collimating lens and the third collimating lens, a telephoto focusing lens is arranged in the light path direction of the blue-transmitting, red-reflecting, and blue-reflecting trap filter is arranged in the light path direction of the telephoto focusing lens, and the green-transmitting, red-reflecting, and blue-reflecting trap filter is arranged in the light 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 trap filter, the semi-transparent and semi-reflective mirror is arranged in the light path directions of the blue-violet LED light source, the purple LED light source and the photodetector, a precise 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 precise 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 λ of the red LED light source 1 The range is 610nm-670nm, and the central wavelength of the green LED light source is λ 2 The range is 500nm-550nm, and the central wavelength of the blue LED light source is λ 3 The range is 450nm-480nm, and the central wavelength of the blue-violet LED light source is λ 4 The range is 440nm-460nm, and the central wavelength of the purple LED light source is λ 5 The range is 410nm-430nm, and the spectrum 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 violet LED light source are all less than 60nm.

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

[0011] The diameter of the first light-through hole in the Hartmann aperture 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 not less than 9*9.

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

[0013] S1. After powering on, do not put the lens to be tested in place and initialize:

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

[0015] S3. Calculate and obtain 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, the precision movable lens moves from right to left, and starts to calculate when it passes the photoelectric gate. 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 x 1 ' 0 ;

[0018] S1.2, bright blue LED light source, the precision movable lens wants to move from left to right, through the photoelectric signal of the photodetector and the photoelectric gate signal, the position of the strongest signal of the blue LED light source with zero optical path difference interference and the position of the photoelectric gate are obtained in turn, and the position of the photoelectric gate triggering position is calculated in reverse, and the corresponding positions of the precision movable lens are 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:

[0022] S2.1, turn on the green LED light source, and the area array camera collects the spot distribution of the quasi-true green light after passing through the Hartmann aperture 14 on the area array camera 15;

[0023] S2.2, turn on the red LED light source, the precision movable lens moves from right to left, and starts counting when it passes through the photoelectric gate. When the photoelectric detector obtains the strongest interference signal of the lower surface of the Hartmann diaphragm, the upper surface of the Hartmann diaphragm, the reflection of the upper surface and the reflection of the lower surface 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, bright blue LED light source, the precision movable lens moves from left to right, through the photoelectric signal of the photoelectric detector and the photoelectric gate signal, different surfaces obtain the position of the strongest signal of the zero optical path difference interference of the blue LED light source and the position of the photoelectric gate in turn, and reversely calculate based on the trigger position of the photoelectric gate to obtain the strongest signal of the zero optical path difference interference of the upper surface of the Hartmann diaphragm, the lower surface of the Hartmann diaphragm, the reflection of the lower surface and the upper surface of the lens to be tested, and record the position of the precision movable lens at this time 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 path, and blue light protection of the lens to be tested in S3 is:

[0028] The optical path lengths of the lenses to be tested with red and blue LEDs of different colors 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, n 1 is the refractive index of the lens to be tested at the central wavelength of the red LED light source 1, n 3 is the refractive index of the lens to be tested at the central wavelength of the blue LED light source 3, and then the central thickness d and refractive index n of the lens to be tested are obtained. 1 and n 3 for:

[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 Wherein 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 T of the lens to be tested is obtained 4 and violet light transmittance T 5 They are and

[0034]

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

[0036] The present invention adopts five wavelengths of LED light source, which is lit in a time-sharing manner, combined with the theory of weak coherent light interference, and realizes the analysis and measurement of the thickness, refractive index, Abbe number, optical path, blue light protection, etc. of the measured lens by motor scanning at the position of the strongest interference signal under zero optical path difference of different interfaces. The whole system has a simple structure, high precision, low cost and high integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0038] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

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

[0040] Figure 2 It is a schematic diagram of the Hartmann aperture 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 and red-reflecting blue trap filter, 11 is a blue-transmitting and red-reflecting dichroic mirror, 12 is a semi-transparent and semi-reflective mirror, 13 is a precision movable lens, 14 is a Hartmann aperture, 14-1 is a shading bracket, 14-2 is a first light hole, 14-3 is a second light hole, 15 is a planar array camera, 16 is a photoelectric detector, 17 is a photoelectric gate, 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 the present application, rather than 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 the present 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 specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples 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 understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to 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 array camera 15, a photodetector 16, a photogate 17, and a lens to be tested 18. The second collimating lens 7 is arranged at the red LED light source. 1, the first quasi-true 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, 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 and red-reflecting and blue trap filter 10 is arranged in the light path direction of the telephoto focusing lens 9, and the green-transmitting and red-reflecting and blue trap filter 10 is arranged in the light path direction of the first quasi-true lens 6. A semi-transparent and semi-reflective mirror 12 is arranged in the light 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 light 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 light 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 light 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 light path direction of the lens to be tested 18, and an area array camera 15 is arranged in the light path direction of the Hartmann diaphragm 14.

[0047] Further, preferably, the central wavelength λ of the red LED light source 1 is 1 The range is 610nm-670nm, the center wavelength of green LED light source 2 is λ 2 The range is 500nm-550nm, the blue LED light source has a central wavelength of 3 3 The range is 450nm-480nm, the blue-violet LED light source has a central wavelength of 4 4 The range is 440nm-460nm, the central wavelength of the purple LED light source is 5 5 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.

[0048] Further, if Figure 2As shown, the Hartmann aperture 14 includes a light shielding 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 shielding 14-1, and the first light hole 14-2 is arranged at the center of the light shielding 14-1.

[0049] Furthermore, the quasi-true lens 6 changes the light of the green LED light source 2 into parallel light, the collimating lens 7 changes the light of the red LED light source 1 into parallel light, the collimating lens 8 changes 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 weak coherent interference signals on the upper and lower surfaces of the lens 18 to be tested 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-1.0 mm, the diameter of the second light holes 14 - 3 is in the range of 0.2 mm-0.5 mm, and the number of the second light holes 14 - 3 is not less than 9*9.

[0052] Furthermore, the green-transmitting and red-reflecting blue 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 and 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 lens 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 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 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 x 10 and x 1 ' 0 .

[0057] 2) When the blue LED light source 3 is on, the precision movable lens 13 moves from left to right. Through the photoelectric signal of the photodetector 16 and the signal of the photoelectric gate 17, 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 are obtained in turn. Based on the trigger position of the photoelectric gate 17, the corresponding positions of the precision movable lens 13 are calculated in reverse. 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 starts. When the photoelectric detector 16 obtains the strongest interference signal of the zero optical path difference of the upper surface of the Hartmann aperture 14, the lower surface of the Hartmann aperture 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 x 11 、x 12 、x 13 and x 14 .

[0063] 3) When the blue LED light source 3 is on, the precision movable lens 13 moves 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 signal of the zero optical path difference interference of the upper surface of the Hartmann aperture 14, the lower surface of the Hartmann aperture 14, the lower surface of the lens to be tested 18, and the upper surface reflection. The positions of the precision movable lens 13 at this time are 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 18 to be tested can be obtained in a traditional manner 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, it can be known that the optical path lengths of the red light LED and blue light LED test lens 18 of different colors and the optical path length changes before and after placement are:

[0068]

[0069] Wherein, d is the center thickness of the lens 18 to be tested, n 1 is the refractive index of the lens 18 to be tested at the central wavelength of the red LED light source 1, n 3 is the refractive index of the lens 18 to be tested at the central wavelength of the blue LED light source 3, and then the central thickness d and refractive index n of the lens 18 to be tested can be obtained. 1 and n 3 for:

[0070]

[0071] According to the regulations, the refractive index n of the lens 18 to be tested is the refractive index corresponding to the light with a wavelength of 546.07 nm. Based on the above data, as a preferred 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 T of the lens 18 to be tested 4 and violet light transmittance T 5 They are and

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

Claims

1. A lens analysis device based on weak coherent light source interference, characterized in that: The invention comprises 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-transmitting, semi-reflecting mirror (12), a precision movable lens (13), a Hartmann aperture (14), an array camera (15), a photoelectric detector (16), a photoelectric gate (17), and a lens to be tested (18), wherein the second collimating lens (7) is arranged on the red LED light source ( 1), the first quasi-true 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), 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 and red-reflecting and blue trap filter (10) is arranged in the light path direction of the telephoto focusing lens (9), and the green-transmitting and red-reflecting and blue trap filter (10) is arranged in the light path direction of the first quasi-true lens (6).

2. The lens analysis device based on weak coherent light source interference according to claim 1, characterized in that: A semi-transparent and semi-reflective mirror (12) is arranged in the light path direction of the green-transmitting and red-reflecting trap filter (10); the semi-transparent and semi-reflective mirror (12) is arranged in the light 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 light 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 light 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 light path direction of the lens to be tested (18); and a surface array camera (15) is arranged in the light path direction of the Hartmann diaphragm (14).

3. The lens analysis device based on weak coherent light source interference according to claim 2, 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).

4. The lens analysis device based on weak coherent light source interference according to claim 1, characterized in that: The central wavelength λ1 of the red LED light source (1) is in the range of 610nm-670nm, the central wavelength λ2 of the green LED light source (2) is in the range of 500nm-550nm, the central wavelength λ3 of the blue LED light source (3) is in the range of 450nm-480nm, the central wavelength λ4 of the blue-violet LED light source (4) is in the range of 440nm-460nm, and the central 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.

5. 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).

6. The lens analysis device based on weak coherent light source interference according to claim 3, 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.

7. The analysis method of the lens analysis device based on weak coherent light source interference according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. After powering on, 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 (18) to be tested.

8. The analysis method of the lens analysis device based on weak coherent light source interference according to claim 7, characterized in that: The method for initialization in S1 is: S1.1, the red LED light source (1) is on, the precision movable lens (13) moves from right to left, and when it 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 x and 10 and x1'0; S1.2, bright blue LED light source (3), the precision movable lens (3) moves from left to right, through the photoelectric signal of the photodetector (16) and the signal of the photoelectric gate (17), 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) are obtained in turn, and the trigger position of the photoelectric gate (17) is reversely calculated, and the corresponding positions of the precision movable lens (13) are x 30 and x' 30 ; S1.3, bright blue-violet LED light source (4), the array camera (15) collects the light intensity I of the blue-violet LED light source (4) at the array camera (15) 40 ; S1.4, turn on the purple LED light source (5), and the array camera (15) collects the light intensity I of the purple LED light source (5) at the array camera (15) 50 .

9. The analysis method of the lens analysis device based on weak coherent light source interference according to claim 7, characterized in that: The method of placing the lens to be tested (18) in S2 for testing is as follows: S2.1, 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); 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 aperture (14), the lower surface of the Hartmann aperture (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 x 11 、x 12 、x 13 and x 14 ; 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 signal of the photoelectric gate (17), different surfaces obtain the position of the strongest signal of zero optical path difference interference of the blue LED light source (3) and the position passing through the photoelectric gate (17) in turn, and reversely calculate the trigger position of the photoelectric gate (17) to obtain the strongest signal of 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 reflection and the upper surface reflection of the lens to be tested (18), and record the position of the precision movable lens (13) at this time as x 31 、x 32 、x 33 and x 34 ; S2.4, bright blue-violet LED light source (4), the array camera (15) collects the light intensity I of the blue-violet LED light source (4) at the array camera (15) 41 ; S2.5, the purple LED light source (5) is turned on, 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 .

10. The analysis method of the lens analysis device based on weak coherent light source interference according to claim 7, characterized in that: The method for calculating the thickness, refractive index, Abbe number, optical path, and blue light protection of the lens (18) to be tested in S3 is: The optical path lengths of the red LED and blue LED test lenses (18) of different colors and the changes in optical path lengths before and after placement are as follows: Wherein, 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. Thus, the center thickness d, refractive index n1 and n3 of the lens (18) to be tested are: According to the regulations, the refractive index n of the lens (18) to be tested is the refractive index corresponding to the light with a wavelength of 546.07 nm. 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 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 T4 and the violet light transmittance T5 of the lens (18) to be tested are obtained as follows: and

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