A method for reducing test error of glass diffusion panel BSDF spectral data

Abstract

The present application belongs to the technical field of glass diffusion plate, and particularly relates to a method for reducing BSDF spectrum data test error of glass diffusion plate, which comprises the following steps: measuring the transmission and reflection of the diffusion plate sample by using a BSDF light source, comparing the transmission and reflection spectrum data tested by using an integrating sphere, and bringing the difference ratio of the two into the spectrum measurement to correct the spectrum measurement result and improve the accuracy of the transmission and reflection spectrum tested by using the integrating sphere; the method for reducing BSDF spectrum data test error of glass diffusion plate has the effects of reducing the BSDF spectrum measurement error of the diffusion plate and improving the authenticity of optical simulation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of glass diffusion plates, and particularly relates to a method for reducing BSDF spectrum data test error of a glass diffusion plate. BACKGROUND

[0002] BSDF is a bidirectional scattering distribution function. When the surface of an object has a small concave-convex unevenness, scattering occurs when incident light is irradiated. The scattering includes reflection and transmission, that is, BRDF and BTDF, that is, BSDF=BRDF+BTDF. BSDF can not only express the proportion and intensity of light reflection and transmission, but also present the distribution of light in each direction.

[0003] At present, when an integral system is used to measure the relationship between all reflection and transmission and wavelength, the following disadvantages exist in the equipment for testing the BSDF of an object. When the thickness of the measured object is relatively thick, light can be coupled out from the side of the object. This part of light cannot enter the integrating sphere of the testing instrument, which causes part of the scattered light not to be collected by the instrument, resulting in measurement error. In addition, when the surface of the measured object is close to an ideal scattering surface, when the sample far from the hole of the integrating sphere produces light diffusion, this part of diffusion is not collected by the integrating sphere, and is included in the proportion of transmission and reflection, resulting in a lower measured value. Correspondingly, the calculated object absorption increases, and the integral spectrum of the BSDF measurement is lower than the actual value, causing a large error.

[0004] Compared with a diffusion film sheet, a direct type diffusion plate product has a relatively thick thickness and a relatively large diffusion degree. When the BSDF spectrum of the diffusion plate is measured, the conventional test method can cause part of the scattered light not to be calculated into the scattered light. The BSDF data combined with the spectrum information with a large error is introduced into optical simulation software, and the simulation result deviates from the actual situation. SUMMARY

[0005] The purpose of the application is to provide a method for reducing the BSDF spectrum data test error of a glass diffusion plate, so as to solve the technical problem that the BSDF data combined with the spectrum information with a large error is introduced into optical simulation software, and the simulation result deviates from the actual situation, and to achieve the purpose of reducing error and reducing the integral error in the BSDF spectrum measurement of the diffusion plate.

[0006] In order to solve the above technical problem, the application provides a method for reducing the BSDF spectrum data test error of a glass diffusion plate, which comprises the following steps.

[0007] The BSDF measurement equipment is used to measure the transmission and reflection of the diffusion plate sample, the integrating sphere measurement device is used to test the transmission and reflection spectrum data of the diffusion plate sample, the two are compared, and the difference ratio is brought into the spectrum measurement to correct the spectrum measurement result and improve the accuracy of the integrating sphere test transmission and reflection spectrum.

[0008] The specific operation method comprises:

[0009] Step one: adjust the light source incidence angle of the BSDF measuring device and the light source incidence angle when the integrating sphere (1) measures the spectrum, so that the light source incidence angle of the BSDF measuring device and the light source incidence angle when the integrating sphere (1) measures the spectrum are consistent;

[0010] Step two: measure the transmission T1 and the reflection R1 of the diffusion plate by the BSDF measuring device respectively under the filtered spectrum light source at 550 nm;

[0011] Step three: measure the transmission T2 and the reflection R2 of the same diffusion plate by the integrating sphere respectively;

[0012] Step four: calculate the measurement difference ratio of both respectively by using the values obtained in step two and step three; the calculation method is: transmission difference ratio = T1 / T2; reflection difference ratio = R1 / R2;

[0013] Step five: bring the transmission and reflection difference ratios into the whole spectrum to obtain the correct spectrum curve.

[0014] The beneficial effects of the present application are:

[0015] 1. The transmission and reflection ratios of the measured sample BSDF are obtained, the accurate transmission and reflection of the single waveband light source are obtained, the transmission and reflection of the integrating sphere test are compared, the difference ratio of both is obtained, the difference ratio is brought into the whole spectrum test, the spectrum test result is corrected, and the correctness of the spectrum test curve is improved.

[0016] In order to make the above-mentioned purpose, characteristics and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0018] Fig. 1 is the structural schematic diagram of the integrating sphere of the method for reducing the BSDF spectrum data test error of the glass diffusion plate of the present application;

[0019] Fig. 2 is the data diagram of transmission of the method for reducing the BSDF spectrum data test error of the glass diffusion plate of the present application;

[0020] Fig. 3 This is a data diagram of the reflection of the present invention.

[0021] In the picture:

[0022] 1. Integral sphere;

[0023] 2. Sample;

[0024] 31. First opening; 32. Second opening;

[0025] 4. Reflected light source;

[0026] 5. Transmitted light source. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1:

[0029] like Figs. 1 to 3 As shown, a method for reducing the measurement error of BSDF spectral data of a glass diffuser plate includes: measuring the transmission and reflection of the diffuser plate sample using a BSDF measurement device, measuring the spectral data of the transmission and reflection of the diffuser plate sample using an integrating sphere measurement device, comparing the two, and incorporating the difference ratio into the spectral measurement to correct the spectral measurement results and improve the accuracy of the integrating sphere test of the transmission and reflection spectra.

[0030] The physical structure of the present invention includes: an integrating sphere 1, a transmission light source 5, and a reflection light source 4. A first opening 31 is provided on one side of the integrating sphere 1, and a second opening 32 is provided on the other side of the integrating sphere 1. The first opening 31 is aligned with the reflection light source 4, and the second opening 32 is aligned with the transmission light source 5. A sample 2 is placed at the second opening 32 of the integrating sphere 1.

[0031] When the integrating sphere 1 measures the reflectance spectrum, the reflectance light source 4 is turned on, the first opening 31 is turned on, the transmission light source 5 on the other side is turned off, the second opening 32 is turned on, and the sample 2 is placed at the second opening 32.

[0032] When the integrating sphere 1 measures the transmission spectrum, the sample 2 is positioned at the second opening 32, the reflected light source 4 and the first opening 31 are closed, and the transmitted light source 5 and the second opening 32 are open. Since the opening size is small, the light emitted from the first opening 31 and the second opening 32 is almost negligible and will not affect the test results.

[0033] When the sample 2 is a diffusion plate, since the diffusion plate has good diffusion effect and a certain thickness, when the direct light is irradiated on the surface of the sample 2, a part of the light will be emitted from the side of the sample 2 and cannot enter the inside of the integrating sphere 1, resulting in a large deviation of the test result.

[0034] The measuring device of the BSDF is matched with a mobile light source and a mobile detection receiver, the light source of the BRDF and the BTDR can be randomly adjusted between 0-60 degrees, and the mobile detection receiver can scan the light source to 0-180°, so that all the reflected and transmitted light can be detected.

[0035] But the light source of the BSDF measurement is a fixed wavelength light source, which cannot measure the spectrum at one time, but in the visible light range, the reflection and transmission ratio of the light in the same medium in different wave bands is not much different, based on this characteristic, a single wavelength light can be derived to the entire visible light band, and the specific operation method is as follows:

[0036] Step one: adjust the light source incidence angle of the BSDF measuring device and the light source incidence angle when the integrating sphere 1 measures the spectrum, so that the light source incidence angle of the BSDF measuring device and the light source incidence angle when the integrating sphere 1 measures the spectrum are consistent;

[0037] Step two: measure the transmission T1 and the reflection R1 of the diffusion plate by the BSDF measuring device through the spectrum light source filtered at 550nm;

[0038] Step three: measure the transmission T2 and the reflection R2 of the same diffusion plate by the integrating sphere 1 respectively;

[0039] Step four: use the values obtained in steps two and three to calculate the measurement difference ratio of the two respectively; the calculation method is: transmission difference ratio = T1 / T2; reflection difference ratio = R1 / R2;

[0040] Step five: bring the transmission and reflection difference ratio into the entire spectrum to obtain the correct spectrum curve.

[0041] Example 2:

[0042] As shown in Fig. 2 and Fig. 3 , the BSDF data of the 1.1mm thick glass diffusion plate is tested by the above method, the light source is selected as a 550nm single wavelength light source, the incidence angle is consistent with the hole angle of the integrating sphere 1, and the transmission and reflection are measured respectively.

[0043] The results are as follows:

[0044] T1=0.41, R1=0.53, 0.41+0.53=0.94

[0045] It can be seen that the proportion of the calculated scattered light to the incident light is 94%, and the absorption of the known glass diffusion plate product in the green light band is about 4-5%. The absorption, transmission and reflection are added to the total amount of incident light. In the example, the scattering proportion is 94%, and the calculated light absorption is 6%. This is only 1-2% different from the theoretical value of 4-5%, and the error range is small.

[0046] The transmission and reflection spectra in the visible light range are tested by the integrating sphere 1, and the average transmission T2=0.37 and the average reflection R2=0.48 are obtained. 0.37+0.48=0.85, the proportion of the calculated transmission and reflection light to the incident light is 85%, and the calculated light absorption is 15%. The absorption of the glass diffusion plate product in the visible light range is about 6-8%, and the error range is 7-9%, which is a larger error.

[0047] Fig. 2 And Fig. 3 In the above, the solid line is the corrected transmission and reflection spectrum curve, and the dotted line is the uncorrected transmission and reflection spectrum curve.

[0048] As described above: the transmission difference ratio and the reflection difference ratio are calculated by the measured values of the two, and the results are: the transmission difference ratio=1.11, and the reflection difference ratio=1.10. The correct spectrum test curve is obtained by bringing the proportion into the whole spectrum.

[0049] The various devices selected in the application are all general standard devices or components known to those skilled in the art, and their structures and principles can be known by those skilled in the art through technical manuals or through conventional experimental methods.

[0050] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0051] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0052] The above-described embodiments according to the present application are intended to be illustrative only. Changes can be made by those skilled in the art, without departing from the scope of the present application, which is defined by the following claims. The technical scope of the present application is not limited to the above-described embodiments. The technical scope of the present application must be determined based on the scope of the claims.

Claims

1. A method of reducing test error of glass BSDF spectral data, characterized in that, The application relates to a method for improving the accuracy of the spectral data of the transmission and reflection of a diffuser plate sample measured by an integrating sphere, and belongs to the technical field of optical measurement. The method comprises the following steps: Step 1: adjusting the light source incidence angle of the BSDF measuring device and the light source incidence angle of the integrating sphere (1) when measuring the spectrum, so that the light source incidence angle of the BSDF measuring device and the light source incidence angle of the integrating sphere (1) when measuring the spectrum are consistent; Step 2: filtering the spectral light source at 550 nm, and measuring the transmission T1 and the reflection R1 of the diffuser plate by the BSDF measuring device respectively; Step 3: measuring the transmission T2 and the reflection R2 of the same diffuser plate by the integrating sphere (1) respectively; Step 4: calculating the measurement difference ratios of the two respectively by using the values obtained in steps 2 and 3; the calculation method is: the transmission difference ratio is T1 / T2; and the reflection difference ratio is R1 / R2; Step 5: bringing the transmission and reflection difference ratios into the whole spectrum to obtain the correct spectral curve. ​

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