Lens absorptivity measuring method and device

Abstract

The embodiment of the invention provides a method and a device for measuring the absorptivity of a lens. The method for measuring the absorptivity of the lens is applied to the device for measuring the absorptivity of the lens, the device for measuring the absorptivity of the lens comprises a beam splitter and an integrating sphere, and a measuring station for placing a to-be-measured lens is arranged in the integrating sphere; the lens absorptivity measurement method comprises the following steps: controlling measurement light to pass through the beam splitter and then be projected to the integrating sphere; under the condition that a to-be-measured lens is placed at the measuring station, the reflectivity R and TRS parameters of the to-be-measured lens are obtained; wherein the TRS parameters comprise transmittance, diffuse reflection rate and internal scattering rate; and according to the reflectivity R and the TRS parameter, acquiring the absorptivity of the to-be-measured lens. According to the lens absorptivity measurement method, the problem that when the lens absorptivity is low, due to the fact that the measurement precision is limited, the absorptivity is always a negative value is solved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical measurement technology. More specifically, the embodiments of the present application relate to a lens absorption rate measurement method and device. Background Art

[0002] In the field of performance testing of optical lenses such as waveguides, it is necessary to measure the absorptivity of optical lenses. At present, spectrophotometer equipment is usually used to measure the transmittance at the vertical moment and the reflectivity with a certain inclination angle in steps based on transmittance (T) + reflectivity (R) + absorptivity (A) = 1. According to the Fresnel reflection law, when the reflectivity of the lens is less than 10°, the reflectivity curve approximately tends to a constant value. The reflectivity at a small angle is measured instead of the reflectivity at the vertical moment. Although this solution has a good application scenario when evaluating products made of materials with high absorptivity, it can qualitatively judge and evaluate the absorptivity level of the lens. However, when the absorptivity of the optical lens is low, due to the limited accuracy of the measuring equipment, negative absorptivity often occurs. It can be seen that for lenses with weak absorption, the existing measurement methods no longer meet the needs. Summary of the invention

[0003] The purpose of this application is to provide a new technical solution for a lens absorption rate measurement method and device.

[0004] In a first aspect, an embodiment of the present application provides a method for measuring the absorption rate of a lens.

[0005] The lens absorptivity measuring method is characterized in that it is applied to a lens absorptivity measuring device, wherein the lens absorptivity measuring device comprises a beam splitter and an integrating sphere, wherein a measuring station for placing the lens to be measured is provided in the integrating sphere;

[0006] The lens absorption rate measurement method comprises:

[0007] Controlling the measuring light to pass through the beam splitter and then project onto the integrating sphere;

[0008] When the lens to be tested is placed in the measuring station, the reflectivity R and TRS parameters of the lens to be tested are obtained; wherein the TRS parameters include transmittance, diffuse reflectivity and internal scattering rate;

[0009] The absorptivity of the lens to be tested is obtained according to the reflectivity R and the TRS parameter.

[0010] Optionally, an optical window for the measuring light to enter is provided on the surface of the integrating sphere;

[0011] The lens absorption rate measurement method also includes:

[0012] Before the lens to be tested is placed on the testing station, the reflection loss rate a1 of the beam splitter and the reflected light energy R of the optical window are obtained. 02 ;and

[0013] According to the reflection loss rate a1 of the beam splitter and the reflected light energy R of the optical window 02 , obtain the calibration value R of the reflected light energy of the optical window 01 .

[0014] Optionally, the method for obtaining the reflectivity loss rate a1 of the beam splitter includes:

[0015] Get the total light intensity value I of the measured light 01 ;

[0016] Obtain the reflected light intensity value I of the measurement light reflected by the beam splitter 02 ;

[0017] According to the total light intensity value I 01 And the reflected light intensity value I 02 , calculate the reflectivity loss rate a1 of the beam splitter.

[0018] Optionally, the lens absorptivity measurement method further includes: obtaining the optical window transmission loss rate a2.

[0019] Optionally, the method for obtaining the reflectivity R of the lens to be tested includes:

[0020] When the lens to be tested is placed in the measuring station, the total reflected light energy R' is obtained. 02 ; Wherein, the total reflected light energy R' 02 The optical window includes the reflected light energy R 02 and the reflected light energy of the lens to be tested;

[0021] According to the reflection loss rate a1 of the beam splitter and the total reflected light energy R' 02 , calculate the calibration value R' of the total reflected light energy 01 ;

[0022] According to the calibration value R' of the reflected total light energy 01 , the calibration value R of the reflected light energy 01 and the optical window transmission loss rate a2, and obtain the reflected light energy R' of the lens to be tested 00 .

[0023] Optionally, the method for obtaining the optical window transmission loss rate a2 includes:

[0024] Obtain the transmission light intensity value I of the measurement light passing through the beam splitter 03 ;

[0025] Obtain the transmission light intensity value I of the measurement light passing through the optical window 04 ;

[0026] According to the transmitted light intensity value I 03 And the transmitted light intensity value I 04 , the optical window transmission loss rate a2 is calculated.

[0027] Optionally, the method for obtaining the reflectivity R of the lens to be tested further includes:

[0028] Obtain the optical window transmitted light energy I 04 ;

[0029] According to the reflected light energy R' of the lens to be tested 00 and the optical window transmitted light energy I 04 , obtain the reflectivity R of the lens to be tested.

[0030] Optionally, the method for obtaining the TRS parameters of the lens to be tested includes:

[0031] Obtain the total transmitted light energy I' of the lens to be tested 05 ; Wherein, the total transmitted light energy I ' 05 Including the transmitted light energy, diffuse reflected light energy and internal scattered light energy of the lens to be tested;

[0032] According to the total transmitted light energy I' of the lens to be tested 05 and the optical window transmitted light energy I 04 , obtain the TRS parameters of the lens to be tested.

[0033] Optionally, the beam splitter is arranged on a rotating stage;

[0034] The lens absorption rate measurement method also includes:

[0035] Control the rotation of the beam splitter to obtain the reflection loss rate a of any surface of the beam splitter A or a B , a1=a A =a B .

[0036] In a second aspect, an embodiment of the present application provides a lens absorption rate measuring device. The lens absorption rate measuring device comprises:

[0037] A light source module, used for emitting measurement light;

[0038] A beam splitter is arranged obliquely on the light output path of the light source module;

[0039] A first detector and a second detector are symmetrically arranged on both sides of the optical axis of the beam splitter; wherein the first detector is configured to be rotatable relative to the beam splitter;

[0040] An integrating sphere, wherein an optical window and a third detector are arranged on the integrating sphere, a measuring station is arranged inside the integrating sphere, and the measuring station is used to place the lens to be measured. When the lens to be measured is placed on the measuring station, the beam splitter, the optical window, the lens to be measured and the third detector are arranged in sequence along the same optical axis.

[0041] Optionally, the first detector can be switched between a first detection position and a second detection position; wherein the first detection position is located on the light path between the light output side of the light source module and the light input side of the beam splitter, and the second detection position is located on the reflected light path of the beam splitter;

[0042] When the first detector is located at the first detection position, it is used to obtain the total light intensity value I of the measurement light. 01 ;

[0043] When the first detector is located at the second detection position, it is used to obtain the reflected light intensity value I of the measuring light reflected by the beam splitter. 02 .

[0044] Optionally, the second detector is used to obtain the optical window reflected light energy R of the optical window. 02 .

[0045] Optionally, before the lens to be tested is placed on the measuring station, the third detector is used to obtain the optical window transmission light intensity value I 04 ;

[0046] When the lens to be tested is placed in the measuring station, the third detector is used to obtain the total transmitted light energy I' of the lens to be tested. 05 ; Wherein, the total transmitted light energy I ' 05 It is the sum of the transmitted light energy, diffuse reflected light energy and internal scattered light energy of the lens to be tested.

[0047] Optionally, the area of ​​the optical window is less than 5% of the surface area of ​​the integrating sphere;

[0048] An optical compensator is arranged on the integrating sphere.

[0049] The beneficial effects of this application are:

[0050] According to an embodiment of the present application, a lens absorptivity measurement method is provided, in which an integrating sphere can be used to detect light signals caused by diffuse reflection and internal scattering on the surface of the lens to be tested, so that the measured lens absorptivity result is more accurate, especially for lenses to be tested with weak absorptivity.

[0051] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0053] Figure 1 This is one of the structural schematic diagrams of the lens absorption rate measurement device provided in an embodiment of the present application;

[0054] Figure 2 The second structural schematic diagram of the lens absorption rate measurement device provided in the embodiment of the present application;

[0055] Figure 3 Schematic diagram of measuring the reflection loss rate of the two surfaces of the beam splitter provided in an embodiment of the present application.

[0056] Description of reference numerals:

[0057] 1. Light source module; 11. Light source; 12. Collimation assembly; 13. Aperture; 2. Beam splitter; 3. First detector; 4. Second detector; 5. Integrating sphere; 51. Optical window; 52. Third detector; 53. Measuring station; 54. Optical compensator; 01. Lens to be tested. DETAILED DESCRIPTION

[0058] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0059] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0060] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0061] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0062] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0063] The lens absorption rate measurement method and device provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0064] According to one embodiment of the present application, a lens absorptivity measurement method is provided, and the lens absorptivity measurement method can be applied to measure the absorption of light by an optical lens.

[0065] The lens absorptivity measurement method provided in the embodiment of the present application can be used, for example, to measure the absorptivity of light to a waveguide. Of course, the lens absorptivity measurement method provided in the embodiment of the present application includes but is not limited to measuring a waveguide, and can also be other types of optical lenses.

[0066] The lens absorption rate measurement method provided in the embodiment of the present application is applied to a lens absorption rate measurement device, see Figure 1 As shown, the lens absorption rate measuring device comprises a beam splitter 2 and an integrating sphere 5, wherein a measuring station 53 for placing the lens 01 to be measured is arranged in the integrating sphere 5. The lens absorption rate measuring method comprises the following steps S1 to S3.

[0067] Step S1, controlling the measuring light 01 to pass through the beam splitter 2 and then project to the integrating sphere 5;

[0068] Step S2, when the lens to be tested 01 is placed in the measuring station 53, the reflectivity R and TRS parameters of the lens to be tested 01 are obtained; wherein the TRS parameters include transmittance, diffuse reflectivity and internal scattering rate;

[0069] Step S3: Obtain the absorptivity of the lens to be tested according to the reflectivity R and TRS parameters of the lens to be tested.

[0070] According to the lens absorptivity measurement method provided in the above embodiment of the present application, the lens 01 to be tested is designed to be placed inside an integrating sphere 5 for measurement. The advantage of this design is that the light signal caused by diffuse reflection and internal scattering on the surface of the lens 01 to be tested can be detected by the integrating sphere 5, so that the measured lens absorptivity result is more accurate.

[0071] The lens absorptivity measurement method provided in the embodiment of the present application can particularly measure the absorptivity of lenses with weak absorptivity, and the measurement result has high accuracy.

[0072] According to the above step S1, the measuring light can be emitted by a light source module 1, for example. Figure 1 .

[0073] In one example, see Figure 1 As shown, the light source module 1 includes a light source 11, a collimating component 12 and an aperture 13 arranged in sequence along the same optical axis. The light source 11 can provide measurement light. The collimating component 12 can collimate the measurement light emitted by the light source 11 into parallel light. The aperture 13 can perform beam reduction processing on the measurement light.

[0074] That is to say, the measuring light emitted by the light source 11 is collimated and focused before being projected to the beam splitter 2 at the rear.

[0075] Of course, the structure of the light source module 1 includes but is not limited to the above examples. Specifically, the collimating assembly 12 and the aperture 13 in the above examples can be replaced by optical fibers, and in this case, a highly collimated light source is required.

[0076] In addition, in the lens absorptivity measurement method provided in the embodiment of the present application, the light source 11 can select multiple single-wavelength light sources for switching testing. In this case, the test results in an absorptivity result curve corresponding to a single wavelength or a small bandwidth.

[0077] According to the above step S2, see Figure 2 In the solution provided by the embodiment of the present application, the lens 01 to be tested is placed inside the integrating sphere 5 for measurement, so that the light signal caused by the diffuse reflection and internal scattering of the surface of the lens 01 to be tested can be detected. At this time, the transmitted light energy of the lens 01 to be tested obtained also includes the diffuse reflection light energy and the internal scattered light energy. For the lens to be tested with weak absorption rate, this makes the absorption rate measurement result more accurate, and can avoid the situation that the absorption rate of the lens of the weak absorption rate material is negative after measurement, which leads to inaccurate measurement results.

[0078] Specifically, in the above step S2 , the TRS parameter of the lens to be tested 01 obtained is the sum of the transmittance, diffuse reflectance and internal scattering rate of the lens to be tested 01 .

[0079] According to the above step S3, the reflectivity R and TRS parameters of the lens to be tested 01 obtained in step S2 are used to calculate the absorption rate Abs of the lens to be tested 01.

[0080] In one example, the absorption rate Abs of the lens to be tested 01 can be calculated using the following algorithm:

[0081] Abs = 100% -R-TRS;

[0082] Wherein, the R is the reflectivity of the lens to be tested 01, and the TRS is the sum of the transmittance, diffuse reflectivity and internal scattering rate of the lens to be tested 01. The R and the TRS can be calculated, and finally the absorption rate Abs of the lens to be tested 01 can be obtained.

[0083] The lens absorptivity measurement method provided in the embodiment of the present application has a good application scenario when measuring lenses made of materials with high absorptivity, and can accurately evaluate the absorptivity level of the lens to be measured. Moreover, when it is used for lenses with low absorptivity, it can avoid, to a certain extent, the situation where the absorptivity of lenses made of materials with weak absorptivity is negative after measurement (inaccurate measurement results). It can be seen that the lens absorptivity measurement method provided in the embodiment of the present application is applicable to lenses with any absorptivity and has a wide range of applications.

[0084] In some examples of this application, see Figure 1 and Figure 2 The surface of the integrating sphere 5 is provided with an optical window 51 for the measuring light to enter. The lens absorption rate measurement method further comprises the following steps:

[0085] Step 01: Before the lens to be tested 01 is placed in the testing station 53, the reflection loss rate a1 of the beam splitter and the reflected light energy R of the optical window are obtained. 02 , see Figure 1 ;and

[0086] Step 02: According to the reflection loss rate a1 of the beam splitter and the reflected light energy R of the optical window 02 , obtain the calibration value R of the reflected light energy of the optical window 01 .

[0087] According to step 01 and step 02 provided in the above example, background light signal collection can be performed before the lens 01 to be tested is placed on the measuring station 53 , that is, when the lens 01 to be tested is not placed on the measuring station 53 .

[0088] Specifically, see Figure 1 The optical window 51 has a certain reflectivity. The measuring light passing through the beam splitter 2 will produce a certain amount of reflection when projected to the optical window 51. This part of the reflected measuring light will be reflected again by the beam splitter 2 and then received by the second detector 4. The second detector 4 can be used to measure the energy R of the reflected light from the optical window. 02 .

[0089] However, the measuring light received by the second detector 4 needs to be reflected by the beam splitter 2, which requires consideration of the reflection loss of the beam splitter 2. Therefore, the energy R of the reflected light from the optical window directly measured by the second detector 4 is 02Calibration is required, and after calibration, the calibration value R of the reflected light energy of the optical window in the above example can be obtained. 01 .

[0090] In one example, the calibration value R of the optical window reflected light energy is 01 It can be obtained according to the following algorithm:

[0091] R 02＝ R 01 ×a1;

[0092] Among them, R 02 is the reflected light energy of the optical window measured by the second detector 4, and a1 is the reflection loss rate of the beam splitter.

[0093] The calibration value R of the optical window reflected light energy 01 , which can provide calculation parameters for the subsequent accurate calculation of the reflectivity R of the lens 01 to be tested.

[0094] In some examples of the present application, the method for obtaining the reflectivity loss rate a1 of the beam splitter includes the following steps 011 to 013:

[0095] Step 011: Obtain the total light intensity value I of the measurement light 01 ;

[0096] Step 012: Obtain the reflected light intensity value I of the measurement light reflected by the beam splitter 2 02 ;

[0097] Step 013: According to the total light intensity value I 01 And the reflected light intensity value I 02 , calculate the reflectivity loss rate a1 of the beam splitter.

[0098] Based on the above example, see Figure 1 The measuring light in step 011 may be emitted by the light source module 1. The measuring light is collimated and focused before reaching the first detector 3. The first detector 3 is located at Figure 1 Specifically, the first detector 3 is located on the optical path between the light-emitting side of the light source module 1 and the light-incoming side of the beam splitter 2. At this time, the first detector 3 records the total light intensity value I of the measurement light. 01 .

[0099] Rotate the first detector 3 to Figure 1 At the solid line frame shown in FIG. 1 , that is, on the reflected light path of the A surface of the first detector 3, the reflected light intensity values ​​I and I reflected by the beam splitter 2 can be obtained respectively. 02 and the transmitted light intensity value I 03 .

[0100] Wherein, according to the total light intensity value I 01 And the reflected light intensity value I 02 , the reflectivity loss rate a1 of the beam splitter can be calculated.

[0101] In one example, the reflectivity loss rate a1 of the beam splitter can be calculated according to the following algorithm:

[0102] a 1＝ I 02 / I 01 ;

[0103] Among them, I 01 is the total light intensity value of the measurement light emitted by the light source module 1, I 02 To measure the reflected light intensity value of the light reflected by the beam splitter 2.

[0104] After calculating the reflectivity loss rate a1 of the beam splitter, it can be substituted into R 02＝ R 01 ×a1, the calibration value R of the reflected light energy of the optical window can be obtained. 01 .

[0105] In some examples of the present application, the lens absorption rate measurement method also includes: obtaining the optical window transmission loss rate a2.

[0106] The lens absorption rate measurement method provided in the embodiment of the present application can be applied to Figure 1 The lens absorption rate measuring device shown in the figure. An integrating sphere 5 is used in the entire lens absorption rate measuring device, and the lens 01 to be measured is placed in the integrating sphere 5 for measurement.

[0107] Specifically, an optical window 51 is opened on the surface of the integrating sphere 5. The measuring light passing through the beam splitter 2 needs to pass through the optical window 51 before reaching the lens to be measured 01 placed in the integrating sphere 5. Since the optical window 51 has a certain transmission loss rate, the optical window transmission loss rate a2 also needs to be considered during the measurement of the lens to be measured 01.

[0108] Therefore, the solution of the present application is designed to obtain the optical window transmission loss rate a2, which is conducive to improving the accuracy of the measurement results.

[0109] In some examples of the present application, the method for obtaining the reflectivity R of the lens to be tested 01 includes the following steps: Figure 2 :

[0110] Step A1: When the lens to be tested 01 is placed in the measuring station 53, the total reflected light energy R' is obtained.02 ; Wherein, the total reflected light energy R' 02 The optical window includes the reflected light energy R 02 and the reflected light energy of the lens to be tested;

[0111] Step A2: according to the reflection loss rate a1 of the beam splitter and the total reflected light energy R' 02 , calculate the calibration value R' of the total reflected light energy 01 ;

[0112] Step A3: according to the calibration value R' of the total reflected light energy 01 , the calibration value R of the reflected light energy 01 and the optical window transmission loss rate a2, and obtain the reflected light energy R' of the lens to be tested 00 .

[0113] According to the above example, in step A1: when the lens to be tested 01 is placed on the measuring station 53 inside the integrating sphere 5, see Figure 2 The data measured by the second detector 4 includes not only the reflected light energy R 02 , in fact, it also has the reflected light energy of the lens to be tested, that is, the total reflected light energy R' 02 .

[0114] According to the above example, in step A2: considering the total reflected light energy R' 02 It needs to be reflected by the beam splitter 2, so it is also necessary to introduce the reflection loss rate a1 of the beam splitter to the total reflected light energy R' 02 Calibration is required to obtain accurate values.

[0115] In one example, the calibration value R' of the reflected total light energy 01 It can be obtained according to the following algorithm:

[0116] R' 02＝ R' 01 ×a1;

[0117] Among them, R' 02 is the total reflected light energy, which includes the reflected light energy R of the optical window 02 and the reflected light energy of the lens to be tested, a1 is the reflection loss rate of the beam splitter.

[0118] Wherein, the total reflected light energy R' 02 It can be measured by the second detector 4, see Figure 2 The reflection loss rate a1 of the beam splitter has been calculated previously.

[0119] The calibration value R' of the reflected total light energy01 , which can provide calculation parameters for the subsequent accurate calculation of the reflectivity R of the lens 01 to be tested.

[0120] According to the above example, in step A3: according to the calibration value R' of the reflected total light energy 01 , the calibration value R of the reflected light energy 01 and the optical window transmission loss rate a2, and obtain the reflected light energy R' of the lens to be tested 00 The specific implementation can be as follows:

[0121] R' 01＝ R 01 +R' 00 ×a2;

[0122] In the above formula: R' 01 is the calibration value of the total reflected light energy obtained in step A2 above, R 01 is the calibration value of the optical window reflected light energy obtained in the aforementioned step 02, and a2 is the optical window transmission loss rate.

[0123] In some examples of the present application, the method for obtaining the optical window transmission loss rate a2 includes the following steps:

[0124] Step B1, obtaining the transmission light intensity value I of the measurement light passing through the beam splitter 2 03 ;

[0125] Step B2: Obtain the transmission light intensity value I of the measurement light passing through the optical window 51 04 ;

[0126] Step B3: according to the transmitted light intensity value I 03 And the transmitted light intensity value I 04 , the optical window transmission loss rate a2 is calculated.

[0127] Based on the above example, see Figure 1 In the above step B1, the measurement light emitted by the light source module 1 is collimated and focused, and then passes through the beam splitter 2, and the transmission light intensity value I of the measurement light passing through the beam splitter 2 can be obtained. 03 Since the total light intensity value I of the measurement light has been measured by the first detector 3 before, 01 And the reflected light intensity value I 02 , so that the transmission light intensity value I of the measuring light passing through the beam splitter 2 can be obtained 03 .

[0128] In step B2 above, please continue to refer to Figure 1When the lens 01 to be tested is not placed on the measuring station 53 in the integrating sphere 5, the third detector 52 provided on the integrating sphere 5 can be used to measure the transmission light intensity value I of the measuring light passing through the optical window 51. 04 .

[0129] In the above step B3, according to the transmitted light intensity value I 03 And the transmitted light intensity value I 04 , the optical window transmission loss rate a2 is calculated.

[0130] In one example, the optical window transmission loss rate a2 can be calculated according to the following algorithm:

[0131] a 2＝ I 04 / I 03 ;

[0132] Among them, I 04 To measure the transmitted light intensity value of the light passing through the optical window 51, I 03 To measure the transmitted light intensity value of the light passing through the beam splitter 2.

[0133] In some examples of the present application, the method for obtaining the reflectivity R of the lens to be tested 01 further includes:

[0134] Obtain the optical window transmitted light energy I 04 ;

[0135] According to the reflected light energy R' of the lens to be tested 00 and the optical window transmitted light energy I 04 , obtain the reflectivity R of the lens 01 to be tested.

[0136] In one example, obtaining the reflectivity R of the lens to be tested 01 may be implemented according to the following algorithm:

[0137] R=(R' 00 / I 04 )×100%;

[0138] Among them, R' 00 is the reflected light energy of the lens to be tested, I 04 is the light energy transmitted by the optical window. That is to say, the reflectivity R of the lens 01 to be tested can be obtained when the reflected light energy and the incident light energy of the lens to be tested are obtained.

[0139] In some examples of the present application, the method for obtaining the TRS parameters of the lens to be tested 01 includes:

[0140] Obtain the total transmitted light energy I' of the lens to be tested 0105 ; Wherein, the total transmitted light energy I ' 05 Including the transmitted light energy, diffusely reflected light energy and internal scattered light energy of the lens 01 to be tested;

[0141] According to the total transmitted light energy I' of the lens 01 to be tested 05 and the optical window transmitted light energy I 04 , obtain the TRS parameters of the lens 01 to be tested.

[0142] According to the above example, the sum of the transmittance, surface diffuse reflection and internal scattering of the lens 01 to be tested is the TRS parameter. The TRS parameter is obtained by calculation according to the following algorithm:

[0143] TRS=(I' 05 / I 04 )×100%;

[0144] Among them, I' 05 is the total transmitted light energy of the lens 01 to be tested, I 04 The optical window transmits light energy.

[0145] When the lens 01 to be tested is placed in the measuring station 53 inside the integrating sphere 5, the total transmitted light energy I′ of the lens 01 to be tested is 05 It can be measured by the third detector 52 arranged on the integrating sphere 5 .

[0146] It should be noted that when the lens to be tested 01 is placed in the measuring station 53 in the integrating sphere 5, the beam splitter 2, the optical window 51, the lens to be tested 01 and the third detector 52 can be arranged in sequence along the same optical axis.

[0147] When the lens to be tested 01 is not placed in the measuring station 53 in the integrating sphere 5, the beam splitter 2, the optical window 51 and the third detector 52 can be arranged in sequence along the same optical axis.

[0148] In some examples of this application, see Figure 3 The beam splitter 2 may be arranged on a rotating platform. The lens absorption rate measurement method further comprises: controlling the beam splitter 2 to rotate, obtaining the reflection loss rate a of any surface of the beam splitter 2 A or a B , a1=a A =a B .

[0149] Specifically, the beam splitter 2 can be placed on an electrically controlled rotating stage, and the rotating stage can be controlled to accurately control the rotation angle of the beam splitter 2 to meet the detection of the reflection loss rate of the A surface and the B surface of the beam splitter 2, and control so that a1=a A =a B＝ I 02 / I 01 ; Among them, I 01 is the total light intensity value of the measured light emitted by light source module 1, I 02 To measure the reflected light intensity of the light reflected by the beam splitter 2.

[0150] According to another embodiment of the present application, a lens absorption rate measuring device is provided.

[0151] See also Figure 1 and Figure 2 , the lens absorption rate measuring device includes: a light source module 1, a beam splitter 2, a first detector 3, a second detector 4, and an integrating sphere 5. The light source module 1 is used to emit a measuring light. The beam splitter 2 is arranged obliquely on the light output path of the light source module. The first detector 3 and the second detector 4 are symmetrically arranged on both sides of the optical axis of the beam splitter 2; wherein the first detector 3 is configured to be able to rotate relative to the beam splitter 2. An optical window 51 and a third detector 52 are arranged on the integrating sphere 5, and a measuring station 53 is arranged in the integrating sphere 5, and the measuring station 53 is used to place the lens 01 to be measured. When the lens 01 to be measured is placed on the measuring station 53, the beam splitter 2, the optical window 51, the lens 01 to be measured and the third detector 52 are arranged in sequence along the same optical axis.

[0152] According to an embodiment of the present application, a lens absorptivity measuring device is provided, and the light signal caused by diffuse reflection and internal scattering on the surface of the lens 01 to be tested can be detected by the integrating sphere 5, so that the measured lens absorptivity result is more accurate, especially for the lens to be tested with a weak absorptivity.

[0153] In one example, see Figure 1 As shown, the light source module 1 includes a light source 11, a collimating component 12 and an aperture 13 arranged in sequence along the same optical axis. The light source 11 can provide measurement light. The collimating component 12 can collimate the measurement light emitted by the light source 11 into parallel light. The aperture 13 can perform beam reduction processing on the measurement light.

[0154] That is to say, the measuring light emitted by the light source 11 is collimated and focused before being projected to the beam splitter 2 at the rear.

[0155] Of course, the structure of the light source module 1 includes but is not limited to the above examples. Specifically, the collimating assembly 12 and the aperture 13 in the above examples can be replaced by optical fibers, and in this case, a highly collimated light source is required.

[0156] In addition, in the lens absorptivity measuring device provided in the embodiment of the present application, the light source 11 can select multiple single-wavelength light sources for switching testing. In this case, the test results in an absorptivity result curve corresponding to a single wavelength or a small bandwidth.

[0157] In some examples of this application, see Figure 1 , the first detector 3 can be switched between the first detection position and the second detection position; wherein the first detection position is located on the optical path between the light output side of the light source module 1 and the light input side of the beam splitter, and the second detection position is located on the reflected optical path of the beam splitter 2; when the first detector 3 is located at the first detection position, it is used to obtain the total light intensity value I of the measurement light 01 When the first detector 3 is located at the second detection position, it is used to obtain the reflected light intensity value I of the measurement light reflected by the beam splitter 2 02 .

[0158] The first detection position of the first detector 3 is located at Figure 1 In the dotted box shown in FIG. 1 , the second detection position of the first detector 3 is located at Figure 1 The solid line frame shown in FIG.

[0159] For example, the first detector 3 can be rotated relative to the beam splitter 2 under the action of a power device to switch between the first detection position and the second detection position.

[0160] The first detector 3 can be driven manually or electrically, and this application does not impose any limitation on this.

[0161] In some examples of this application, see Figure 1 The second detector 4 can be used to obtain the optical window reflected light energy R of the optical window. 02 .

[0162] See also Figure 1 The optical window 51 has a certain reflectivity, so that the measurement light passing through the beam splitter 2 will produce a certain amount of reflection when projected to the optical window 51, and this part of the reflected measurement light will be reflected again by the beam splitter 2 and received by the pre-set second detector 4. At this time, the second detector 4 can measure the reflected light energy R of the optical window 02 .

[0163] However, the measuring light received by the second detector 4 needs to be reflected by the beam splitter 2, which requires consideration of the reflection loss. 02 Calibration is required, and after calibration, the calibration value R of the reflected light energy of the optical window in the above example can be obtained. 01 .

[0164] In one example, the calibration value R of the optical window reflected light energy is 01 It can be obtained by the following algorithm: R 02＝ R 01 ×a1; where R 02 is the reflected light energy of the optical window measured by the second detector 4, and a1 is the reflection loss rate of the beam splitter.

[0165] The calibration value R of the optical window reflected light energy 01 , which can provide calculation parameters for the subsequent accurate calculation of the reflectivity R of the lens 01 to be tested.

[0166] In some examples of this application, see Figure 1 Before the lens to be tested 01 is placed on the measuring station 53, the third detector 52 is used to obtain the optical window transmission light intensity value I 04 See also Figure 2 When the lens to be tested 01 is placed in the measuring station 53, the third detector 52 is used to obtain the total transmitted light energy I' of the lens to be tested 01. 05 ; Wherein, the total transmitted light energy I ' 05 It is the sum of the transmitted light energy, diffusely reflected light energy and internal scattered light energy of the lens 01 to be tested.

[0167] In some examples of the present application, the area of ​​the optical window 51 is less than 5% of the surface area of ​​the integrating sphere 5 ; and an optical compensator 54 is disposed on the integrating sphere 5 .

[0168] In order to ensure the optical efficiency of the integrating sphere 5, the area of ​​the optical window 51 should be less than 5% of the surface area of ​​the integrating sphere 5. In addition, an optical compensator 54 is provided to compensate for the influence of the optical window 51 on the optical efficiency.

[0169] The specific implementation of the lens absorption rate measurement device of the embodiment of the present application can refer to the various embodiments of the lens absorption rate measurement method mentioned above, so it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0170] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0171] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A method for measuring lens absorption rate, characterized in that: Applicable to a lens absorptivity measuring device, the lens absorptivity measuring device comprises a beam splitter and an integrating sphere, wherein a measuring station for placing the lens to be measured is arranged in the integrating sphere; The lens absorption rate measurement method comprises: Controlling the measuring light to pass through the beam splitter and then project onto the integrating sphere; When the lens to be tested is placed in the measuring station, the reflectivity R and TRS parameters of the lens to be tested are obtained; wherein the TRS parameters include transmittance, diffuse reflectivity and internal scattering rate; The absorptivity of the lens to be tested is obtained according to the reflectivity R and the TRS parameter.

2. The lens absorption rate measurement method according to claim 1, characterized in that: An optical window for the measuring light to enter is arranged on the surface of the integrating sphere; The lens absorption rate measurement method also includes: Before the lens to be tested is placed on the testing station, the reflection loss rate a1 of the beam splitter and the reflected light energy R of the optical window are obtained. 02 ;and According to the reflection loss rate a1 of the beam splitter and the reflected light energy R of the optical window 02 , obtain the calibration value R of the reflected light energy of the optical window 01 .

3. The lens absorption rate measurement method according to claim 2, characterized in that: The method for obtaining the reflectivity loss rate a1 of the beam splitter comprises: Get the total light intensity value I of the measured light 01 ; Obtain the reflected light intensity value I of the measurement light reflected by the beam splitter 02 ; According to the total light intensity value I 01 And the reflected light intensity value I 02 , calculate the reflectivity loss rate a1 of the beam splitter.

4. The lens absorption rate measurement method according to claim 2, characterized in that: The lens absorption rate measurement method also includes: obtaining the optical window transmission loss rate a2.

5. The lens absorption rate measurement method according to claim 4, characterized in that: The method for obtaining the reflectivity R of the lens to be tested comprises: When the lens to be tested is placed in the measuring station, the total reflected light energy R' is obtained. 02 ; Wherein, the total reflected light energy R' 02 The optical window includes the reflected light energy R 02 and the reflected light energy of the lens to be tested; According to the reflection loss rate a1 of the beam splitter and the total reflected light energy R' 02 , calculate the calibration value R' of the total reflected light energy 01 ; According to the calibration value R' of the reflected total light energy 01 , the calibration value R of the reflected light energy 01 and the optical window transmission loss rate a2, and obtain the reflected light energy R' of the lens to be tested 00 .

6. The lens absorption rate measurement method according to claim 5, characterized in that: The method for obtaining the optical window transmission loss rate a2 includes: Obtain the transmission light intensity value I of the measurement light passing through the beam splitter 03 ; Obtain the transmission light intensity value I of the measurement light passing through the optical window 04 ; According to the transmitted light intensity value I 03 And the transmitted light intensity value I 04 , the optical window transmission loss rate a2 is calculated.

7. The lens absorption rate measurement method according to claim 5 or 6, characterized in that: The method for obtaining the reflectivity R of the lens to be tested further includes: Obtain the optical window transmitted light energy I 04 ; According to the reflected light energy R' of the lens to be tested 00 and the optical window transmitted light energy I 04 , obtain the reflectivity R of the lens to be tested.

8. The lens absorption rate measurement method according to claim 7, characterized in that: The method for obtaining the TRS parameters of the lens to be tested comprises: Obtain the total transmitted light energy I' of the lens to be tested 05 ; Wherein, the total transmitted light energy I ' 05 Including the transmitted light energy, diffuse reflected light energy and internal scattered light energy of the lens to be tested; According to the total transmitted light energy I' of the lens to be tested 05 and the optical window transmitted light energy I 04 , obtain the TRS parameters of the lens to be tested.

9. The lens absorption rate measurement method according to claim 3, characterized in that: The beam splitter is arranged on a rotating platform; The lens absorption rate measurement method also includes: Control the rotation of the beam splitter to obtain the reflection loss rate a of any surface of the beam splitter A or a B , a1=a A =a B .

10. A lens absorption rate measuring device, characterized in that: include: A light source module (1), used for emitting measurement light; A beam splitter (2) is arranged obliquely on the light output path of the light source module (1); A first detector (3) and a second detector (4) are symmetrically arranged on both sides of the optical axis of the beam splitter (2); wherein the first detector (3) is configured to be rotatable relative to the beam splitter (2); An integrating sphere (5), wherein an optical window (51) and a third detector (52) are arranged on the integrating sphere (5), and a measuring station (53) is arranged inside the integrating sphere (5), and the measuring station (53) is used to place the lens (01) to be measured; When the lens to be tested (01) is placed on the measuring station (53), the beam splitter (2), the optical window (51), the lens to be tested (01) and the third detector (52) are arranged in sequence along the same optical axis.

11. The absorption rate measuring device according to claim 10, characterized in that: The first detector (3) can be switched between a first detection position and a second detection position; wherein the first detection position is located on the light path between the light output side of the light source module (1) and the light input side of the beam splitter (2), and the second detection position is located on the reflected light path of the beam splitter (2); When the first detector (3) is located at the first detection position, it is used to obtain the total light intensity value I of the measurement light 01 ; When the first detector (3) is located at the second detection position, it is used to obtain the reflected light intensity value I of the measurement light reflected by the beam splitter (2). 02 .

12. The absorption rate measuring device according to claim 10, characterized in that: The second detector (4) is used to obtain the optical window reflected light energy R of the optical window (51). 02 .

13. The absorption rate measuring device according to claim 10, characterized in that: Before the lens to be tested (01) is placed on the measuring station (53), the third detector (52) is used to obtain the optical window transmission light intensity value I 04 ; When the lens to be tested (01) is placed at the measuring station (53), the third detector (52) is used to obtain the total transmitted light energy I' of the lens to be tested (01). 05 ; Wherein, the total transmitted light energy I ' 05 It is the sum of the transmitted light energy, diffusely reflected light energy and internal scattered light energy of the lens (01) to be tested.

14. The absorption rate measuring device according to claim 10, characterized in that: The area of ​​the optical window (51) is less than 5% of the surface area of ​​the integrating sphere (5); An optical compensator (54) is arranged on the integrating sphere (5).

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