System and method for measuring reflectivity of optical device

Abstract

The invention relates to a system and a method for measuring the reflectivity of an optical device, and the system is used for measuring the reflectivity of the optical device to be measured. A light detector; a device for improving the uniform responsivity of a photodetector; wherein a light beam output by the light source device enters an optical device to be measured, reflected light enters the equipment for improving the uniform responsivity of the light detector, and the light detector is used for detecting luminosity information of input light which enters the equipment for improving the uniform responsivity of the light detector and is processed by the equipment for improving the uniform responsivity of the light detector.

Description

Technical Field

[0001] The present invention relates to the field of measurement technology, and in particular to a reflectivity measurement system and a measurement method for an optical device. Background Art

[0002] With the rapid development of the automotive industry, the reflectivity of the interior rearview mirror of a car has become an important quality indicator. The reflectivity of the rearview mirror lens not only affects the driving safety of the driver, but also affects the market competitiveness of the car. Therefore, automobile manufacturers and related institutions need a test system that can accurately test the reflectivity of the interior rearview mirror of the car. However, the current structural types of related test systems are single and cannot fully meet the flexible needs of various test scenarios in practice. Direct use of these systems may even cause inaccurate measurement results. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a reflectivity measurement system and method for an optical device, which can meet the flexible needs of various test scenarios and improve the accuracy of the measurement results.

[0004] On one hand, the present application provides a reflectivity measurement system for an optical device, which is used to measure the reflectivity of an optical device to be measured, comprising:

[0005] Light source device;

[0006] Light detector;

[0007] Devices for improving uniform responsivity of photodetectors;

[0008] The light beam output by the light source device is incident on the optical device to be measured, and the reflected light enters the device for improving the uniform responsiveness of the light detector. The light detector is used to detect the photometric information of the input light that enters the device for improving the uniform responsiveness of the light detector and is processed by the device for improving the uniform responsiveness of the light detector.

[0009] In a preferred embodiment, the device for improving the uniform responsivity of the photodetector comprises a diffuser.

[0010] In a preferred embodiment, the diffuser includes an inner cavity diffuser, a perspective diffuser or a reflective diffuse reflector.

[0011] In a preferred embodiment, the inner cavity diffuser is a light integrating sphere.

[0012] In a preferred embodiment, a calibration position is provided on the inner wall of the inner cavity diffuser for determining whether the input direction of the input light beam incident into the inner cavity diffuser meets a predetermined requirement.

[0013] In a preferred embodiment, the light source device includes a light source body and a beam shaping device for shaping the light beam emitted by the light source body.

[0014] In a preferred embodiment, the beam shaping device includes a collimator, a collimator lens group, or a collimator lens for shaping the light beam output by the light source body into a parallel light beam.

[0015] In a preferred embodiment, the photodetector includes a probe and a processing circuit, wherein the probe 31 is arranged at a specific position of the device 2 for improving the uniform responsiveness of the photodetector, and receives a light beam incident to the position through a light receiving surface of the probe, and the processing circuit is used to process the signal received by the probe and output the photometric information of the light beam received by the light receiving surface of the probe.

[0016] In a preferred embodiment, it also includes: a fixed adjustment bracket for adjusting the position and / or direction of the optical device to be measured, a fixed adjustment bracket for adjusting the position and / or direction of the light source device, and / or a fixed adjustment bracket for adjusting the position and / or direction of the device for improving the uniform responsiveness of the light detector.

[0017] On the other hand, the present application also provides a method for measuring the reflectivity of an optical device using the above-mentioned reflectivity measurement system of an optical device, comprising:

[0018] Determining, by means of a light detector, an output value corresponding to the luminosity of the light beam output by the light source device and an output value corresponding to the luminosity of the reflected light beam of the optical device to be measured;

[0019] Determining the reflectivity of the optical device to be measured according to an output value corresponding to the luminosity of the light beam output by the light source device and an output value corresponding to the luminosity of the reflected light beam of the optical device to be measured;

[0020] Among them, the output value corresponding to the luminosity of the reflected light beam of the optical device to be measured is: the light detector detects the luminosity information of the reflected light beam of the optical device to be measured after being processed by a device for improving the uniform responsiveness of the light detector, and outputs the output value corresponding to the luminosity of the reflected light beam of the optical device.

[0021] In a preferred embodiment, the light detector determines the output value corresponding to the luminosity of the output light beam of the light source device, including: the light detector determines the output value corresponding to the luminosity of the output light beam of the light source device by a direct calibration method, and / or determines the output value corresponding to the luminosity of the output light beam of the light source device by an indirect calibration method.

[0022] In a preferred embodiment, the light detector determines the output value corresponding to the luminosity of the light beam output by the light source device by direct calibration, including:

[0023] The device for improving the uniformity of the light detector directly receives the light beam output by the light source device, and detects the luminous intensity information of the light beam output by the light source device after being processed by the device for improving the uniformity of the light detector through the light detector, and outputs an output value corresponding to the luminosity of the light beam output by the light source device.

[0024] In a preferred embodiment, the light detector determines the output value corresponding to the luminosity of the light beam output by the light source device by an indirect calibration method, including:

[0025] After the light beam output by the light source device is incident on the standard optical device sample, the reflected light enters the device for improving the uniform responsiveness of the light detector. The light detector detects the photometric information of the reflected light beam of the standard optical device sample after being processed by the device for improving the uniform responsiveness of the light detector, and outputs an output value corresponding to the photometric information of the reflected light beam of the standard optical device sample. Then, the output value corresponding to the photometric information of the reflected light beam of the standard optical device sample is determined by the reflectivity of the standard optical device sample and the output value corresponding to the photometric information of the reflected light beam of the standard optical device sample.

[0026] In the technical solution proposed in the present application, the light beam output by the light source device can first be incident on the optical device to be measured, and the reflected light can then enter the device for improving the uniform responsiveness of the light detector. The relative positions and directions among the light source device, the optical device to be measured, and the device for improving the uniform responsiveness of the light detector can be adjusted so that the light beam propagation path and angle meet the preset requirements, and the light path transmission path is consistent with the pre-conceived one, thereby reducing the deviation between the light path and the expectation during actual measurement and improving the accuracy of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of a rearview mirror reflectivity measurement system in the prior art;

[0028] Figure 2 is a schematic diagram of a working state of an optical device reflectivity measurement system provided by an embodiment of the present application;

[0029] Figure 3 is a flow chart of a reflectivity measurement method of an optical device provided in one embodiment of the present application;

[0030] Figure 4 A schematic diagram of the system setting position for determining the photometric information of a light beam output by a light source device by a direct calibration method;

[0031] Figure 5 is a flow chart of a reflectivity measurement method of an optical device provided in another embodiment of the present application;

[0032] Figure 6 This is a flow chart of a reflectivity measurement method of an optical device provided in yet another embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] The inventors of this application Figure 1The structure of the rearview mirror reflectivity measurement system in the prior art shown and the accuracy of the measurement results were tested and analyzed, and it was found that in the prior art, the parallel light output by the light source and the collimator 01 directly enters the light integrating sphere 02, and the test rearview mirror is placed at the test mirror bracket 03. After the parallel light enters the light integrating sphere 02, it first enters the rearview mirror surface at the test mirror bracket 03, and the incident angle is within the range specified by the Chinese national standard GB 15084-2022, that is, 25°±5°. After the reflected light is diffusely reflected by the inner surface of the light integrating sphere 02, the light detector 04 detects the illumination information of at least part of the light, and displays the reflectivity of the test rearview mirror through the reflectivity pointer interface 041 of the indicator instrument 04. The indicator instrument 04 also has a zero adjustment button 042 and an adjustment calibration button 043. Since the light emitted by the light source 01 is incident on the rearview mirror and the reflection occurs inside the light integrating sphere 02, in order to meet the provisions of the relevant standards on the range of incident angles, the angle between the direction of the incident light entering the light integrating sphere 02 and the normal direction of the supporting plane of the trial mirror bracket 03 (that is, the direction of the line from the contact position between the trial mirror bracket 03 and the light integrating sphere 02 to the center of the light integrating sphere 02) must fall within the above-mentioned specified range of incident angles. Therefore, the position of the incident port of the light integrating sphere 02, the direction of the incident light, and the position of the trial mirror bracket 03 in the prior art measurement system are strictly correlated, and such a light integrating sphere must be customized. However, in practice, the specifications of the rearview mirrors to be measured vary, and there are often certain errors in the optical path construction of the measurement system. The optical path direction of the measurement system constructed by the customized light integrating sphere during the actual measurement process often deviates from the expected direction. For example, the deviation between the actual incident angle of the incident light at the position of the rearview mirror to be measured and the specified range will lead to inaccurate reflectivity test results. The failure of the incident light to first enter the rearview mirror position in the light integrating sphere will lead to a greater degree of error in the reflectivity test results. In summary, the light source of the measurement system in the prior art needs to be incident on the surface of the rearview mirror to be measured in the light integrating sphere. It is constrained by the range of the incident angle. The light integrating sphere here needs to be customized. Since the system customization cannot be adjusted, the deviation between the light path and the expected direction cannot be effectively corrected during the actual measurement, resulting in inaccurate test results.

[0035] Embodiment 1

[0036] Based on the above analysis of the causes of the problems in the prior art, a reflectivity measurement system for an optical device in the present application is proposed. Figure 2A schematic diagram of a working state of an optical device reflectivity measurement system provided by an embodiment of the present application is shown. The optical device here refers to a component unit of an optical system, and the reflectivity of the optical device needs to be measured. The optical device may specifically include imaging optical devices, non-imaging optical devices, and other optical devices. Imaging optical devices include reflective imaging optical devices, refractive imaging optical devices, diffractive imaging optical devices, and a device group formed by any combination of the above various imaging optical devices. Reflective imaging optical devices can be divided into plane reflective optical devices, concave reflective optical devices, convex reflective optical devices, etc. according to the main surface shape. Reflective imaging optical devices can include rearview mirrors, etc. according to the application field. It should be noted that the optical device may be a multi-layer structure, so there are multiple surfaces, at least one of which contributes to the reflected light of the entire optical device, so the reflectivity of the optical device reflects the contribution of the reflectivity of at least one surface in the device.

[0037] like Figure 2 As shown, the optical device reflectivity measurement system includes: a light source device 1, a device 2 for improving the uniform responsivity of a light detector, and a light detector 3. The light beam r1 output by the light source device 1 is incident on the optical device 5 to be measured, and the reflected light r2 enters the device 2 for improving the uniform responsivity of the light detector. Improving the uniform responsivity of the light detector 2 can enable the light detector 3 to provide uniform responsivity to different input lights to meet the needs of photometric detection. The light detector 3 detects the photometric information of the input light processed by the device 2 for improving the uniform responsivity of the light detector.

[0038] The device 2 for improving the uniform response of the light detector can be a diffuser, that is, an object that converts an incident light beam into a diffuse output. The diffuser can be an inner cavity diffuser, a perspective diffuser, or a reflective diffuse reflector. The inner cavity diffuser uses a diffuse surface to form an inner cavity of various shapes, for example, it can be a spherical inner cavity diffuser, a cylindrical inner cavity diffuser, etc. The spherical inner cavity diffuser can also be called a "light integrating sphere". Figure 2 In the illustrated embodiment, the device 2 for improving the uniform responsivity of the photodetector adopts a light integrating sphere as a specific implementation mode. The inner surface of the light integrating sphere may be coated with a diffuse reflective material, which preferably has almost no selectivity for at least part of the visible light spectrum.

[0039] When the device 2 for improving the uniform responsivity of the photodetector in the form of an inner cavity diffuser is used, the light receiving surface of the photodetector 3 can be located at a specific opening of the device 2 for improving the uniform responsivity of the photodetector. The photodetector 3 can specifically include a probe 31 and a processing circuit 32. The probe 31 is disposed at a specific opening of the device 2 for improving the uniform responsivity of the photodetector, and the probe 31 has a light receiving surface. The processing circuit 32 is used to process the signal received by the probe, thereby outputting the photometric information of the light beam received by the light receiving surface of the probe 31. The photometric information can specifically be illuminance information, and the unit can be lm (lumen).

[0040] According to the needs of the detection scene, the light source device 1 can be a light source device that emits a divergent beam, a focused beam or a parallel beam. The light source device 1 can include a light source body 101 and a beam shaping device 102 that shapes the beam emitted by the light source body 101. According to the requirements of the light source device 1 outputting the beam shape, the beam shaping device 102 shapes the beam output by the light source body 101 to obtain an output light with a desired beam shape. In a preferred embodiment, the beam shaping device 102 can be a beam shaping device that shapes the beam output by the light source body 101 into a parallel beam, which can further make the actual beam transmission path closer to the expected one, and further enhance the accuracy of the measurement result. In addition, the diameter of the parallel beam output by the beam shaping device 102 after shaping can meet the minimum requirements of the relevant standards. For example, the Chinese national standard GB15084-2022 stipulates that the diameter of the incident beam on the test surface should not be less than 13 mm, so the diameter of the parallel beam output by the beam shaping device 102 after shaping can be greater than this value, for example, it can reach more than 25 mm.

[0041] The beam shaping device 102 that shapes the light beam output by the light source body 101 into a parallel light beam can be a collimator, a collimating lens group, or a collimating lens. The light source body 101 can be a standard light source, such as the standard illuminant A specified by CIE (International Commission on Illumination). A halogen tungsten lamp with a color temperature of 2856K can be used as the standard illuminant A. The light source body 101 can be driven by a power supply. In order to enhance the stability of the light power output by the light source body 101, a voltage-stabilized power supply can be used as the power supply of the light source body 101 to ensure the stability of the driving voltage of the light source.

[0042] The light beam emitted by the light source body 101 can be transmitted to the light beam shaping device 102 through an open space, or can be transmitted to the light beam shaping device 102 through an optical fiber 103. Accordingly, the light beam shaping device 102 can be a fiber collimator.

[0043] In the embodiment of the present application, after the light beam r1 output by the light source device 1 is incident on the optical device 5 to be measured, the reflected light r2 enters the device 2 for improving the uniform response of the light detector. In a preferred embodiment, the angle between the incident light beam of the optical device 5 to be measured in the measurement system and the surface normal of the optical device 5 at the incident position (i.e., the incident angle of the incident light beam of the optical device 5) can meet the requirements of relevant measurement standards. For example, the incident angle of the incident light beam of the optical device 5 is within the range of 25°±5° specified in the Chinese national standard GB15084-2022. Figure 2 In the figure, the light beam r1 output by the light source device 1 directly enters the optical device 5 to be measured without passing through other devices. Therefore, the incident light beam of the optical device 5 is the light beam r1 output by the light source device 1. The angle between the surface normal of the optical device 5 at the incident position of the light beam r1 and the light beam r1 is the incident angle of the incident light beam of the optical device 5.

[0044] It should also be noted that when the incident light beam of the optical device 5 is a non-parallel light beam (for example, a divergent light beam with a divergence angle, or a convergent light beam with a convergence angle), the transmission direction of the incident light beam can be defined as the direction of the central axis of the incident light beam. Accordingly, the angle between the incident light beam of the optical device 5 and the surface normal of the optical device 5 at the incident position is defined as: at the intersection of the axis of the incident light beam of the optical device 5 and the incident position of the optical device 5, the angle between the axis of the incident light beam and the surface normal of the optical device 5 at the intersection.

[0045] When the incident light beam of the optical device 5 is a parallel light beam, the transmission direction of the incident light beam can be defined as the overall transmission direction of the incident light beam, and the overall transmission direction is the same as the axial direction of the incident light beam. Considering that the incident light beam has a certain irradiation area on the surface of the optical device 5, the incident position of the incident light beam on the optical device 5 is an area with a certain area.

[0046] On the premise that the incident light beam is a parallel light beam, when the surface shape of the optical device 5 in the incident position area is a plane, for example, the entire surface of the optical device 5 facing the incident light beam is a plane, or the optical device 5 is a plane at least in the incident position area of ​​the incident light beam, then the angle between the incident light beam of the optical device 5 and the surface normal of the optical device 5 at the incident position can be defined as: the angle between the surface normal of any light ray in the incident light beam at the incident position of the optical device 5 and the light ray.

[0047] On the premise that the incident light beam is a parallel light beam, when the surface shape of the optical device 5 in the incident position area is a non-planar surface (such as a convex surface, a concave surface, a spherical surface, an aspherical surface, or a free-form surface, etc.), the angle between the incident light beam of the optical device 5 and the surface normal of the optical device 5 at the incident position can be defined as: at the intersection of the axis of the incident light beam of the optical device 5 and the incident position of the optical device 5, the angle between the axis of the incident light beam and the surface normal of the optical device 5 at the intersection.

[0048] In order to meet the requirements of the incident angle of the incident light beam of the optical device 5, the relative positions of the light source device 1 and the optical device 5 can be adjusted. In practice, the positions of the light source device 1 and the optical device 5 can be used to preliminarily determine the incident angle of the light beam output by the light source device 1 when it is incident on the surface of the optical device 5. It is also possible to more accurately determine whether the incident angle meets the requirements by actually measuring the angle between the direction of the incident light beam incident on the surface of the optical device 5 and the surface normal of the optical device 5 at the incident position. Another alternative method for determining the incident angle is to determine the angle between the incident light beam and the reflected light beam of the optical device 5. According to the law of reflection, the incident angle is equal to the reflection angle. Therefore, the angle between the incident light beam and the reflected light beam is equal to twice the incident angle. Therefore, half of the angle between the incident light beam and the reflected light beam can be determined as the incident angle of the incident light beam of the optical device 5. The angle between the incident light beam and the reflected light beam (for example Figure 2 The angle between the middle light beam r1 and the light beam 2 can be measured according to the actual light path, and can also be calculated by the relative positions between the light source device 1, the optical device 5, and the device 2 for improving the uniform response of the light detector.

[0049] In order to ensure the improvement of measurement accuracy, it is necessary to adjust the relative position between the optical device 5 to be measured and the device 2 for improving the uniform responsivity of the light detector so that the reflected light beam (such as Figure 2 The light beam r2 in the optical device to be measured can be completely received by the device 2 for improving the uniform responsivity of the light detector. When the device 2 for improving the uniform responsivity of the light detector is an inner cavity diffuser (such as a light integrating sphere), the inner cavity diffuser can be provided with an input hole 21 for receiving input light, and the reflected light beam reflected by the optical device 5 to be measured should be able to be incident on the inside of the device 2 for improving the uniform responsivity of the light detector through the input hole 21.

[0050] Some detection scenarios have specific requirements for the direction of the input light incident into the device 2 for improving the uniform responsivity of the light detector. In this case, it is also necessary to adjust the position and direction of the device 2 for improving the uniform responsivity of the light detector so that the direction of the input light meets the requirements. For example, taking the device 2 for improving the uniform responsivity of the light detector as a light integrating sphere, if the input light beam incident into the light integrating sphere is required to be normal incidence, that is, the incident light passes through the input hole 21 and the geometric center of the light integrating sphere, in order to calibrate the incident light of the input light beam, the position where the inner wall of the light integrating sphere is directly opposite to the input hole 21 (that is, a line is drawn from the input hole 21 to the geometric center of the light integrating sphere and continues to extend, intersecting the inner wall of the light integrating sphere and the position opposite to the input hole 21) can be used as the calibration position, so that the input light beam of the light integrating sphere is directly incident on the calibration position, and a mark point can be set at the calibration position to observe whether the input light beam is directly incident on the calibration position by visual inspection or instrument. In practice, some devices 2 for improving the uniform responsivity of light detectors in the form of internal cavity diffusers are provided with a turntable at the calibration position that can switch between a "light trap" and a reflector. At this time, the light trap or the reflector can be used as a marking point without setting up a separate marking point. It should be noted that when using a light trap as a marking point, after completing the calibration of the input light beam angle, the light trap needs to be switched to a reflector to ensure the accuracy of subsequent measurements. The reflection characteristics of the reflector here are similar to the reflection characteristics of other areas of the inner cavity of the internal cavity diffuser, so both have certain diffusion characteristics.

[0051] In order to more conveniently and stably adjust the position and direction of the components in the above optical device reflectivity measurement system, preferably, a fixed adjustment bracket can be provided for at least one component. For example, a lifting bracket 8 can be provided for the light source device 1. In addition to supporting height adjustment, the lifting bracket 8 can also support angle rotation. Figure 2 In the embodiment, the lifting bracket 8 can specifically clamp or support the beam shaping device 102 in the light source device 1. When the light source body 101 and the beam shaping device 102 transmit the light beam through the flexible optical fiber 103, there is no special requirement for the position of the light source body 101. A lifting bracket 6 can be set for the optical device 5 to be measured. In addition to supporting height adjustment, the lifting bracket 6 can also support angle rotation. The lifting bracket 6 can specifically clamp or support the optical device 5 to be measured. In addition, in order to more conveniently fix and determine the reflectivity measurement system of the entire optical device and the position of the optical device 5 to be measured, at least one element can be set on the optical platform 4. The optical platform 4 not only has good flatness and shock absorption, but also has an array of mounting holes on the surface for fixing components. The distance, angle and other information between components can also be indirectly determined through the array of mounting holes.

[0052] The output value of the light detector 3 is a linear function of the illuminance on the light receiving surface area of ​​the light detector 3. The original output value can be a voltage signal, and the corresponding illuminance information can be calculated after conversion. The output end of the light detector 3 can be connected to an indicating instrument as recommended by the Chinese national standard GB15084-2022. Through pre-calibration, the indicating instrument can convert the output signal of the light detector 3 into the reflectivity of the optical device 5 to be measured. In another alternative implementation, the output end of the detector 3 is connected to a data processing device such as a computer 7, and the data processing device stores the output information of the detector 3, and performs further data processing to obtain the reflectivity of the optical device 5 to be measured. In addition, the measurement results can be output through an output device, such as through a screen display output of a display or through a printer print output.

[0053] In the above reflectivity measurement system, ambient light may enter the device 2 for improving the uniform responsivity of the light detector and mix into the output value of the light detector 3, thereby affecting the accuracy of the reflectivity measurement. In order to reduce the influence of the ambient light on the measurement result, in a preferred embodiment, the measurement system further includes a light shield 9 arranged outside the reflectivity measurement system. The light shield 9 shields at least a portion of the optical path of the light beam in the reflectivity measurement system propagating in the open space from the ambient light, for example, Figure 2 As shown, the light shield 9 shields the portion of the optical path from the beam shaping device 102 to the device 2 for improving the uniform responsivity of the light detector from the ambient light.

[0054] A method for measuring the reflectivity of an optical device to be measured using the above-mentioned reflectivity measurement system for an optical device is described in detail below.

[0055] Embodiment 2

[0056] Figure 3 FIG. 1 is a flow chart of a method for measuring reflectivity of an optical device provided in an embodiment of the present application. Figure 3 As shown, the method uses a direct calibration method to measure the reflectivity of an optical device, specifically including:

[0057] Step S301 : turning on the light source device 1 and preheating it for a specific time to improve the stability of the light output by the light source device 1 .

[0058] After the light source device 1 is powered on, it needs to be preheated for a period of time before the working state of the light source device 1 is stabilized. The preheating time can be set to about 30 minutes.

[0059] Step S302: Adjust the positions of the devices in the optical device reflectivity measurement system to Figure 4 The method shown in the figure uses a direct calibration method to determine the position of the photometric information of the light beam output by the light source device.

[0060] See also Figure 4 The light beam r3 output by the light source device 1 is not Figure 2 The reflection of the optical device 5 to be measured is directly incident on the device 2 for improving the uniform responsivity of the light detector. The photometric information measured by the light detector 3 reflects the photometric information of the original light beam output by the light source device 1, and can be used as the denominator of the formula used in the subsequent calculation of the reflectivity of the optical device 5. The method of determining the photometric information of the light beam output by the light source device 1 in this way is called a direct calibration method.

[0061] In this step, the relative positions of the light source device 1 and the device 2 for improving the uniform responsivity of the light detector need to be adjusted so that the light beam r3 output by the light source device 1 is completely received by the device 2 for improving the uniform responsivity of the light detector. When the device 2 for improving the uniform responsivity of the light detector is an inner cavity diffuser (such as a light integrating sphere), the light beam r3 output by the light source device 1 should be able to completely pass through the input hole 21 and enter the interior of the device 2 for improving the uniform responsivity of the light detector.

[0062] Step S303: Determine whether the output beam power of the light source device 1 is stable.

[0063] Whether the power of the light beam output by the light source device 1 is stable can be determined by measuring the power value of the light beam output by the light source device 1. For example, the power value of the light beam output by the light source device 1 can be measured at intervals of the same or different time periods. If the power value fluctuation range is within the threshold range, it is considered that the power of the light beam output by the light source device 1 is stable. Of course, the power value of the light beam output by the light source device 1 can also be measured continuously. If the curve of the power value changes tends to be horizontal and gentle, it is considered that the power of the light beam output by the light source device 1 is stable.

[0064] Since the position of the device 2 for improving the uniformity of the photodetector has been adjusted to the position of directly receiving the output light beam of the light source device 1 in step S302, the device 2 for improving the uniformity of the photodetector and the photodetector 3 can be used to detect whether the power of the output light beam of the light source device 1 is stable. Specifically, the photometric information detected by the photodetector 3 after being processed by the device 2 for improving the uniformity of the photodetector can be obtained, for example, at intervals of the same or different time periods, and the photometric values ​​detected by the photodetector 3 can be obtained. When the power value fluctuation range is within the threshold range, it is considered that the power of the output light beam of the light source device 1 has stabilized. Alternatively, the photometric values ​​output by the photodetector 3 can be continuously obtained. If the curve of the photometric values ​​tends to be horizontal and gentle, it is considered that the power of the output light beam of the light source device 1 has stabilized.

[0065] Step S304: Determine the output value corresponding to the luminosity of the light beam output by the light source device 1 by direct calibration.

[0066] Specifically, the device 2 for improving the uniform responsiveness of the light detector directly receives the light beam r3 output by the light source device 1, and the light detector 3 detects the luminous intensity information of the light beam output by the light source device 1 after being processed by the device 2 for improving the uniform responsiveness of the light detector, and outputs an output value corresponding to the luminosity of the light beam output by the light source device 1.

[0067] If there are specific requirements for the direction of the input light incident into the device 2 for improving the uniform responsivity of the light detector, it is also necessary to adjust the position and direction of the device 2 for improving the uniform responsivity of the light detector so that the direction of the input light meets the requirements. For example, taking the device 2 for improving the uniform responsivity of the light detector as a light integrating sphere, if the input light beam incident into the light integrating sphere is required to be normal incidence, that is, the incident light passes through the input hole 21 and the geometric center of the light integrating sphere, in order to calibrate the incident light of the input light beam, the position where the inner wall of the light integrating sphere is directly opposite to the input hole 21 (that is, a line is drawn from the input hole 21 to the geometric center of the light integrating sphere and continues to extend, intersecting the inner wall of the light integrating sphere and the position opposite to the input hole 21) can be used as the calibration position, so that the input light beam of the light integrating sphere is directly incident on the calibration position, and a mark point can be set at the calibration position to observe whether the input light beam is directly incident on the calibration position by visual inspection or instrument. In practice, some devices 2 for improving the uniform responsivity of light detectors in the form of internal cavity diffusers are provided with a turntable at the calibration position that can switch between a "light trap" and a reflector. At this time, the light trap or the reflector can be used as a marking point without setting up a separate marking point. It should be noted that when using a light trap as a marking point, after completing the calibration of the input light beam angle, the light trap needs to be switched to a reflector to ensure the accuracy of subsequent measurements. The reflection characteristics of the reflector here are similar to the reflection characteristics of other areas of the inner cavity of the internal cavity diffuser, so both have certain diffusion characteristics.

[0068] The output value of the photodetector 3 may specifically be a voltage value corresponding to the illuminance, and the illuminance may be the illuminance value received by the light receiving surface of the photodetector 3. It should be noted that the illuminance received by the light receiving surface of the photodetector 3 may only reflect a part of the luminous flux of the light beam r3 output by the light source device 1. For example, when the device 2 for improving the uniformity of the photodetector responsiveness is an inner cavity diffuser (such as a light integrating sphere), and the photodetector 3 receives the illuminance information at a specific position on the inner wall of the inner cavity diffuser (for example, the light receiving surface of the photodetector 3 is set at a specific position opening of the light integrating sphere), the voltage value output by the photodetector 3 directly corresponds to the illuminance information at the position. However, as long as the input angle of the input light entering the device 2 for improving the uniformity of the photodetector responsiveness is kept constant during the entire detection process, the luminance information of the input light entering the device 2 for improving the uniformity of the photodetector responsiveness can be indirectly reflected by the voltage value output by the photodetector 3, because the ratio of the illuminance at the position directly corresponding to the voltage value output by the photodetector 3 to the luminance of the input light entering the device 2 for improving the uniformity of the photodetector responsiveness is almost a fixed value. In order to further ensure that the light loss caused by the transmission path length remains almost unchanged during different measurement processes, the transmission distance of the output light beam of the light source device 1 from the light source device 1 to the device 2 for improving the uniform response of the light detector can be recorded, which can be recorded as L.

[0069] In order to improve the detection accuracy, in step S304, the output value corresponding to the luminosity of the output light beam of the light source device 1 can be measured multiple times, and the output values ​​measured multiple times can be averaged to obtain the final output value corresponding to the luminosity of the output light beam of the light source device 1, which can be recorded as U 光 .

[0070] exist Figure 4 In the process, the ambient light may enter the device 2 for improving the uniform responsivity of the light detector and mix into the output value of the light detector 3, thereby affecting the measurement of the output value corresponding to the luminosity of the light beam output by the light source device 1. Therefore, in order to reduce the influence of the ambient light on the measurement result, in a preferred embodiment, the measurement system further includes a light shield 9 arranged outside the reflectivity measurement system. The light shield 9 at least shields the part of the light path of the light beam in the reflectivity measurement system that propagates in the open space from the ambient light, for example Figure 4 As shown, the light shield 9 shields the portion of the optical path from the beam shaping device 102 to the device 2 for improving the uniform responsivity of the light detector from the ambient light.

[0071] Step S305: Adjust the positions of the devices in the optical device reflectivity measurement system to Figure 2 The operating position of the measuring optics reflectivity is shown.

[0072] By adjusting the positions of the relevant devices in step S305, the light beam output by the light source device 1 no longer directly enters the device 2 for improving the uniform responsivity of the light detector.

[0073] Step S306: After the light beam r1 output by the light source device 1 is incident on the optical device 5 to be measured, the reflected light r2 enters the device 2 for improving the uniform responsivity of the light detector.

[0074] By adjusting the relative positions of the optical device 5 to be measured, the light source device 1 and the device 2 for improving the uniform responsivity of the light detector, the angle between the incident light beam of the optical device 5 to be measured and the surface normal of the optical device 5 at the incident position meets the expected requirements, such as within the range of 25°±5° specified in the Chinese national standard GB15084-2022, and the reflected light beam (such as Figure 2 The light beam r2) can be completely received by the device 2 for improving the uniform responsivity of the light detector. In addition, in order to ensure that the ratio of the illuminance directly corresponding to the voltage value output by the subsequent light detector 3 to the luminance of the input light entering the device 2 for improving the uniform responsivity of the light detector is almost a fixed value, it is necessary to ensure that the input angle of the input light entering the device 2 for improving the uniform responsivity of the light detector remains unchanged and is the same as the input angle when the direct calibration method is working in step S304. Further, in order to ensure that the light loss caused by the length of the transmission path is almost the same in different measurement processes, it is necessary to ensure that the transmission distance between the light beam output by the light source device 1 in this step, the light source device, the optical device 5 to be measured, and the device 2 for improving the uniform responsivity of the light detector remains unchanged and is the same as the transmission distance L recorded when the direct calibration method is working in step S304.

[0075] If there are specific requirements for the direction of the input light incident into the device 2 for improving the uniform responsivity of the light detector, it is also necessary to adjust the position and direction of the device 2 for improving the uniform responsivity of the light detector so that the direction of the input light meets the requirements. For example, taking the device 2 for improving the uniform responsivity of the light detector as a light integrating sphere, if the input light beam incident into the light integrating sphere is required to be normal incidence, that is, the incident light passes through the input hole 21 and the geometric center of the light integrating sphere, in order to calibrate the incident light of the input light beam, the position where the inner wall of the light integrating sphere is directly opposite to the input hole 21 (that is, a line is drawn from the input hole 21 to the geometric center of the light integrating sphere and continues to extend, intersecting the inner wall of the light integrating sphere and the position opposite to the input hole 21) can be used as the calibration position, so that the input light beam of the light integrating sphere is directly incident on the calibration position, and a mark point can be set at the calibration position to observe whether the input light beam is directly incident on the calibration position by visual inspection or instrument. In practice, some devices 2 for improving the uniform responsivity of light detectors in the form of internal cavity diffusers are provided with a turntable at the calibration position that can switch between a "light trap" and a reflector. At this time, the light trap or the reflector can be used as a marking point without setting up a separate marking point. It should be noted that when using a light trap as a marking point, after completing the calibration of the input light beam angle, the light trap needs to be switched to a reflector to ensure the accuracy of subsequent measurements. The reflection characteristics of the reflector here are similar to the reflection characteristics of other areas of the inner cavity of the internal cavity diffuser, so both have certain diffusion characteristics.

[0076] Step S307 : the photodetector 3 detects the photometric information of the reflected light beam r2 of the optical device 5 to be measured after being processed by the device 2 for improving the uniformity of the photodetector, and outputs an output value corresponding to the photometric information of the reflected light beam r2 of the optical device 5 .

[0077] The output value of the light detector 3 is specifically a voltage value corresponding to the light intensity. In practice, in order to improve the detection accuracy, the light detector 3 can also be used to measure the photometric information of the reflected light beam r2 of the optical device 5 to be measured multiple times, and the output values ​​of the multiple measurements are averaged to obtain the final output value corresponding to the photometric information of the reflected light beam r2 of the optical device 5.

[0078] Step S308: The reflectivity of the optical device 5 to be measured is obtained by dividing the output value corresponding to the luminosity of the reflected light beam r2 detected by the light detector in step S307 by the output value corresponding to the luminosity of the output light beam of the light source device 1 detected by the light detector in step S304.

[0079] When the optical device 5 to be measured has a plurality of working states with different reflectivity, it is necessary to respectively perform steps S307 - S308 for at least one working state with reflectivity to obtain the reflectivity of the optical device 5 in each working state with reflectivity.

[0080] For example, when the optical device 5 to be measured is a rearview mirror with an anti-glare function, such as the "rearview mirror with dimming function" disclosed in the Chinese patent invention specification CN108303812B, the intensity of the reflected light of the rearview mirror can be automatically adjusted according to the ambient light intensity, and the reflectivity can be adjusted specifically by changing the driving voltage of the rearview mirror. Figure 2 The power driver 51 in the rearview mirror drives the rearview mirror to be in the two states of anti-glare function on and anti-glare function off, respectively, and the steps S307-S308 are respectively performed. In step S307, the output values ​​corresponding to the luminosity of the reflected light beam of the optical device 5 in the two states are obtained, respectively recorded as U 开 and U 关 . Correspondingly, in step S308, U 开 and U 关 Divided by the output value corresponding to the luminosity of the output light beam of the light source device 1, the reflectivity of the two states are:

[0081] R 开 =U 开 / U 光 , R 关 =U 关 / U 光 .

[0082] In order to improve the reliability of the reflectivity measurement method in this embodiment, in a preferred implementation, before step S306, the optical device 5 to be measured is replaced by a calibrated standard optical device sample and is placed at the original position of the optical device 5 to be measured. The reflectivity of the calibrated standard optical device sample has been pre-calibrated and is recorded as R 标 At this time, after the light beam output by the light source device 1 is incident on the standard optical device sample, the reflected light enters the device 2 for improving the uniformity of the light detector, and then the light detector 3 detects the photometric information of the reflected light beam of the standard optical device sample processed by the device 2 for improving the uniformity of the light detector, and outputs an output value corresponding to the photometric information of the reflected light beam of the standard optical device sample, which is recorded as U 标 Then through U 标 and the output value U corresponding to the luminosity of the light beam output by the light source device 1 measured in step S304 光 , and the actual reflectivity of the standard optical device sample is obtained by measuring:

[0083] R 标测 =U 标 / U 光 .

[0084] The measured reflectivity R 标测 With the pre-calibrated reflectivity R 标Compare and determine the detection error of the entire system. When the detection error of the entire system is greater than the threshold, the subsequent steps need to be suspended to check the source of the error; when the detection error of the entire system is less than the threshold, continue to execute the subsequent steps.

[0085] Embodiment 3

[0086] Figure 5 FIG. 1 is a flow chart showing a reflectivity measurement method of an optical device provided by another embodiment of the present application. Figure 5 As shown in the figure, the method uses an indirect calibration method to measure the reflectivity of optical devices, which specifically includes:

[0087] Step S501 : turning on the light source device 1 and preheating it for a specific period of time to improve the stability of the light output by the light source device 1 .

[0088] After the light source device 1 is powered on, it needs to be preheated for a period of time before the working state of the light source device 1 is stabilized. The preheating time can be set to about 30 minutes.

[0089] Step S502: Adjust the positions of the devices in the optical device reflectivity measurement system to Figure 2 The method is shown. Figure 2 In the embodiment, after the light beam r1 output by the light source device 1 is incident on the optical device 5 to be measured, the reflected light r2 enters the device 2 for improving the uniform responsivity of the light detector.

[0090] By adjusting the relative positions among the optical device 5 to be measured, the light source device 1 and the device 2 for improving the uniform responsivity of the light detector, the angle between the incident light beam of the optical device 5 to be measured and the surface normal at the incident position of the optical device 5 meets the expected requirements.

[0091] If there are specific requirements for the direction of the input light incident into the device 2 for improving the uniform responsivity of the light detector, it is also necessary to adjust the position and direction of the device 2 for improving the uniform responsivity of the light detector so that the direction of the input light meets the requirements. For example, taking the device 2 for improving the uniform responsivity of the light detector as a light integrating sphere, if the input light beam incident into the light integrating sphere is required to be normal incidence, that is, the incident light passes through the input hole 21 and the geometric center of the light integrating sphere, in order to calibrate the incident light of the input light beam, the position where the inner wall of the light integrating sphere is directly opposite to the input hole 21 (that is, a line is drawn from the input hole 21 to the geometric center of the light integrating sphere and continues to extend, intersecting the inner wall of the light integrating sphere and the position opposite to the input hole 21) can be used as the calibration position, so that the input light beam of the light integrating sphere is directly incident on the calibration position, and a mark point can be set at the calibration position to observe whether the input light beam is directly incident on the calibration position by visual inspection or instrument. In practice, some devices 2 for improving the uniform responsivity of light detectors in the form of internal cavity diffusers are provided with a turntable at the calibration position that can switch between a "light trap" and a reflector. At this time, the light trap or the reflector can be used as a marking point without setting up a separate marking point. It should be noted that when using a light trap as a marking point, after completing the calibration of the input light beam angle, the light trap needs to be switched to a reflector to ensure the accuracy of subsequent measurements. The reflection characteristics of the reflector here are similar to the reflection characteristics of other areas of the inner cavity of the internal cavity diffuser, so both have certain diffusion characteristics.

[0092] Step S503: Determine whether the output beam power of the light source device 1 is stable.

[0093] In this embodiment, no Figure 4 Therefore, it is not possible to directly detect the photometric information of the light beam output by the light source device 1 to determine whether its beam power is stable, but it can be determined indirectly. For example, it is possible to preliminarily detect whether the photometric information of the reflected light of the optical device 5 to be measured is stable, which indirectly reflects whether the output beam power of the light source device 1 is stable. The photometric information of the reflected light of the optical device 5 to be measured can be used to determine whether the output beam power of the light source device 1 is stable. Figure 2 In the state shown, the photodetector 3 is used to detect the luminosity information of the reflected light beam r2 of the optical device 5 to be measured after being processed by the device 2 for improving the uniform responsiveness of the photodetector, and output an output value corresponding to the luminosity of the reflected light beam r2 of the optical device 5.

[0094] Step S504: Determine the output value corresponding to the luminosity of the light beam output by the light source device 1 by an indirect calibration method.

[0095] The indirect calibration method here means that the calibrated standard optical device sample replaces the optical device 5 to be measured and is set at the original position of the optical device 5 to be measured. The reflectivity of the calibrated standard optical device sample has been pre-calibrated and is recorded as R 标 At this time, after the light beam output by the light source device 1 is incident on the standard optical device sample, the reflected light enters the device 2 for improving the uniformity of the light detector, and then the light detector 3 detects the photometric information of the reflected light beam of the standard optical device sample processed by the device 2 for improving the uniformity of the light detector, and outputs an output value corresponding to the photometric information of the reflected light beam of the standard optical device sample, which is recorded as U 标 Then through U 标 and the previously known reflectivity R of the standard optical device sample 标 , determine the output value corresponding to the luminosity of the output light beam of the light source device 1:

[0096] U 光1 =U 标 / R 标 .

[0097] Step S505: After the light beam r1 output by the light source device 1 is incident on the optical device 5 to be measured, the reflected light r2 enters the device 2 for improving the uniform responsivity of the light detector. The light detector 3 detects the photometric information of the reflected light beam r2 of the optical device 5 to be measured after being processed by the device 2 for improving the uniform responsivity of the light detector, and outputs an output value corresponding to the photometric information of the reflected light beam r2 of the optical device 5.

[0098] The output value of the photodetector 3 may specifically be a voltage value corresponding to the illuminance, and the illuminance may be the illuminance value received by the light receiving surface of the photodetector 3. It should be noted that the illuminance received by the light receiving surface of the photodetector 3 may only reflect a part of the luminous flux of the reflected light beam r2 of the optical device 5. For example, when the device 2 for improving the uniform responsiveness of the photodetector is an inner cavity diffuser (such as a light integrating sphere), and the photodetector 3 receives the illuminance information at a specific position of the inner wall of the inner cavity diffuser (for example, the light receiving surface of the photodetector 3 is set at a specific position opening of the light integrating sphere), the voltage value output by the photodetector 3 directly corresponds to the illuminance information at the position. However, as long as the input angle of the input light entering the device 2 for improving the uniform responsiveness of the photodetector remains unchanged during the entire detection process, the luminous information of the input light entering the device 2 for improving the uniform responsiveness of the photodetector can be indirectly reflected by the voltage value output by the photodetector 3.

[0099] Step S506: The reflectivity of the optical device 5 to be measured is obtained by dividing the output value corresponding to the luminosity of the reflected light beam r2 detected by the light detector in step S505 by the output value corresponding to the luminosity of the output light beam of the light source device 1 calculated in step S504.

[0100] When the optical device 5 to be measured has a plurality of working states with different reflectivity, it is necessary to respectively perform step S506 for at least one working state with reflectivity to obtain the reflectivity of the optical device 5 in each working state with reflectivity.

[0101] For example, when the optical device 5 of the device to be measured is a rearview mirror with an anti-glare function whose reflectivity can be adjusted by adjusting the driving voltage, the steps S505-S506 can be performed respectively when the rearview mirror is in two states: the anti-glare function is turned on and the anti-glare function is turned off. In step S505, the output values ​​corresponding to the luminosity of the reflected light beam of the optical device 5 in the two states are obtained, which are respectively recorded as U 开 and U 关 . And in S506, U 开 and U 关 Divided by the output value corresponding to the luminosity of the output light beam of the light source device 1 calculated in step S504, the reflectivity of the two states is obtained respectively:

[0102] R 开 =U 开 / U 光1 , R 关 =U 关 / U 光1 .

[0103] In order to improve the detection accuracy, when the optical device 5 to be measured has a plurality of working states with different reflectivities, the standard optical device samples used in step S504 can select a plurality of standard optical device samples with reflectivities close to the different working states of the optical device 5, and determine the output value corresponding to the luminosity of the output light beam of the light source device 1 for each standard optical device sample. When calculating the reflectivities of the different working states of the optical device 5 to be measured in step S506, the output values ​​corresponding to the luminosity of the output light beam of the light source device 1 determined in step S504 based on the standard optical device samples with reflectivities close to the optical device 5 are used respectively.

[0104] It should be noted that the execution order of the above step S505 and step S506 can be interchanged.

[0105] In addition, the output value U corresponding to the luminosity of the light beam output by the light source device 1 determined in step S504 is 光1It is just an intermediate calculation result, which is used in the denominator term used in calculating the reflectivity of the optical device 5 to be measured in step S506. Unless the user wants to view the intermediate calculation result, it is not necessary to explicitly calculate the output value U in step S504 in other scenarios. 光1 .

[0106] For example, step S504 can be replaced by step S504': the photodetector 3 detects the photometric information of the reflected light beam of the standard optical device sample after being processed by the device 2 for improving the uniform responsivity of the photodetector, and outputs an output value corresponding to the photometric information of the reflected light beam of the standard optical device sample, which is recorded as U 标 .

[0107] The corresponding step S506 can be replaced by step S506': using the output value U corresponding to the luminosity of the reflected light beam of the standard optical device sample detected in step S504' 标 , the reflectivity R of the standard optical device sample 标 , and the output value corresponding to the luminosity of the reflected light beam r2 detected in step S505, to obtain the reflectivity of the optical device 5 to be measured. Specifically, the output value corresponding to the luminosity of the reflected light beam of the optical device to be measured can be divided by the output value corresponding to the luminosity of the reflected light beam of the standard optical device sample, and then multiplied by the reflectivity of the standard optical device sample, to finally obtain the reflectivity of the optical device 5 to be measured. For example, when the optical device 5 to be measured is a rearview mirror with an anti-glare function whose reflectivity can be adjusted by adjusting the driving voltage, the steps S505-S506' can be performed respectively when the rearview mirror is in the two states of the anti-glare function on and the anti-glare function off, and the output values ​​corresponding to the luminosity of the reflected light beam of the optical device 5 in the two states in step S505 are obtained, which are respectively recorded as U 开 and U 关 , and in S506', use the formula R 开 =U 开 *R 标 / U 标 , and R 关 =U 关 *R 标 / U 标 The reflectivity of the two states is obtained respectively.

[0108] Embodiment 4

[0109] Figure 6 A flow chart of a reflectivity measurement method of an optical device provided by another embodiment of the present application is shown. Figure 6 As shown, the method uses a combination of direct calibration method and indirect calibration method to measure the reflectivity of optical devices, and the measurement results can be calibrated against each other, specifically including:

[0110] Step S601 : turning on the light source device 1 and preheating it for a specific time to improve the stability of the light output by the light source device 1 .

[0111] Step S602: Adjust the positions of the devices in the optical device reflectivity measurement system to Figure 4 The position of the photometric information of the light beam output by the light source device is determined by a direct calibration method.

[0112] Step S603: Determine whether the output beam power of the light source device 1 is stable.

[0113] Since the position of the device 2 for improving the uniform responsiveness of the light detector has been adjusted to a position to directly receive the light beam output by the light source device 1 in step S602, the device 2 for improving the uniform responsiveness of the light detector and the light detector 3 can be used to detect whether the power of the light beam output by the light source device 1 is stable.

[0114] Step S604: directly receiving the light beam r3 output by the light source device 1 through the device 2 for improving the uniformity of the light detector, and detecting the photometric information of the light beam output by the light source device 1 after being processed by the device 2 for improving the uniformity of the light detector through the light detector 3, and outputting an output value corresponding to the photometric information of the light beam output by the light source device 1, thereby obtaining an output value U corresponding to the photometric information of the light beam output by the light source device 1 determined by a direct calibration method. 光 .

[0115] The transmission distance of the output light beam of the light source device 1 from the light source device 1 to the device 2 for improving the uniform responsivity of the light detector can be recorded, which can be denoted as L.

[0116] In order to improve the detection accuracy, in step S604, the output value corresponding to the luminosity of the light beam output by the light source device 1 can be measured multiple times, and the output values ​​measured multiple times can be averaged to obtain the final output value corresponding to the luminosity of the light beam output by the light source device 1, which can be recorded as U 光 .

[0117] Step S605: Adjust the positions of the devices in the optical device reflectivity measurement system to Figure 2 The method shown.

[0118] By adjusting the positions of the relevant devices in step S605, the light beam output by the light source device 1 no longer directly enters the device 2 for improving the uniform responsivity of the light detector.

[0119] Step S606: Determine the output value U corresponding to the luminosity of the light beam output by the light source device 1 by indirect calibration. 光1 .

[0120] The calibrated standard optical device sample is used to replace the optical device 5 to be measured and is placed at the original position of the optical device 5 to be measured. The reflectivity of the calibrated standard optical device sample has been calibrated in advance and is recorded as R 标 At this time, after the light beam output by the light source device 1 is incident on the standard optical device sample, the reflected light enters the device 2 for improving the uniformity of the light detector, and then the light detector 3 detects the photometric information of the reflected light beam of the standard optical device sample processed by the device 2 for improving the uniformity of the light detector, and outputs an output value corresponding to the photometric information of the reflected light beam of the standard optical device sample, which is recorded as U 标 Then through U 标 and the previously known reflectivity R of the standard optical device sample 标 , determine the output value corresponding to the luminosity of the output light beam of the light source device 1 obtained by indirect calibration:

[0121] U 光1 =U 标 / R 标 .

[0122] Step S607: After the light beam r1 output by the light source device 1 is set to be incident on the optical device 5 to be measured, the reflected light r2 enters the device for improving the uniform responsivity of the light detector 2. The photodetector 3 detects the photometric information of the reflected light beam r2 of the optical device 5 to be measured after being processed by the device for improving the uniform responsivity of the light detector 2, and outputs an output value corresponding to the photometric information of the reflected light beam r2 of the optical device 5.

[0123] Step S608: The output value corresponding to the luminosity of the reflected light beam r2 detected by the light detector in step S607 is divided by the output value corresponding to the luminosity of the output light beam of the light source device 1 determined by the direct calibration method in step S604 and the indirect calibration method in step S606, respectively, to obtain the reflectivity of the optical device 5 to be measured determined by the direct calibration method and the indirect calibration method, respectively.

[0124] Step S609: Compare the reflectivity of the optical device 5 to be measured determined by the direct calibration method and the indirect calibration method to verify the detection error.

[0125] In summary, in the technical solution proposed in the present application, the light beam output by the light source device can first be incident on the optical device to be measured, and the reflected light then enters the device for improving the uniform responsiveness of the light detector. The relative positions and directions between the light source device, the optical device to be measured, and the device for improving the uniform responsiveness of the light detector can be adjusted so that the light beam propagation path and angle meet the pre-set requirements, and the light path transmission path is guaranteed to be consistent with the pre-conceived requirements, thereby reducing the deviation between the light path and the expectation during actual measurement, and improving the accuracy of the measurement results. At the same time, because the position of the components in the entire system is flexible and adjustable, the incident angle of the incident light beam of the optical device to be measured can be adjusted, and the incident angle of the input light entering the device for improving the uniform responsiveness of the light detector can be adjusted, so there is no need to use a customized light integrating sphere as in the prior art, and it can flexibly adapt to different test environment requirements.

[0126] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0127] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0128] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A reflectivity measurement system for an optical device, used to measure the reflectivity of an optical device to be measured, comprising: Light source device; Light detector; Devices for improving uniform responsivity of photodetectors; The light beam output by the light source device is incident on the optical device to be measured, and the reflected light enters the device for improving the uniform responsiveness of the light detector. The light detector is used to detect the photometric information of the input light that enters the device for improving the uniform responsiveness of the light detector and is processed by the device for improving the uniform responsiveness of the light detector.

2. The reflectivity measurement system of an optical device according to claim 1, characterized in that: The apparatus for improving uniform responsivity of a photodetector includes a diffuser.

3. The reflectivity measurement system of an optical device according to claim 2, characterized in that: The diffuser includes an inner cavity diffuser, a perspective diffuser or a reflective diffuse reflector.

4. The reflectivity measurement system of an optical device according to claim 3, characterized in that: The inner cavity diffuser is a light integrating sphere.

5. The reflectivity measurement system of an optical device according to claim 3, characterized in that: The inner wall of the inner cavity diffuser is provided with a calibration position for determining whether the input direction of the input light beam incident into the inner cavity diffuser meets a predetermined requirement.

6. The reflectivity measurement system of an optical device according to claim 1, characterized in that: The light source device comprises a light source body and a beam shaping device for shaping a light beam emitted by the light source body.

7. The reflectivity measurement system of an optical device according to claim 6, characterized in that: The beam shaping device includes a collimator, a collimator lens group, or a collimator lens for shaping the beam output by the light source body into a parallel beam.

8. The reflectivity measurement system of an optical device according to claim 1, characterized in that: The photodetector includes a probe and a processing circuit, wherein the probe 31 is arranged at a specific position of the device 2 for improving the uniform responsiveness of the photodetector, and receives a light beam incident to the position through a light receiving surface of the probe, and the processing circuit is used to process the signal received by the probe and output the photometric information of the light beam received by the light receiving surface of the probe.

9. The reflectivity measurement system of an optical device according to claim 1, characterized in that: Also includes: A fixed adjustment bracket for adjusting the position and / or orientation of an optical device to be measured, a fixed adjustment bracket for adjusting the position and / or orientation of a light source device, and / or a fixed adjustment bracket for adjusting the position and / or orientation of a device for improving the uniform responsiveness of a light detector.

10. A method for measuring the reflectivity of an optical device using the reflectivity measurement system of an optical device according to any one of claims 1 to 9, comprising: Determining, by means of a light detector, an output value corresponding to the luminosity of the light beam output by the light source device and an output value corresponding to the luminosity of the reflected light beam of the optical device to be measured; Determining the reflectivity of the optical device to be measured according to an output value corresponding to the luminosity of the light beam output by the light source device and an output value corresponding to the luminosity of the reflected light beam of the optical device to be measured; in, The output value corresponding to the luminosity of the reflected light beam of the optical device to be measured is: the light detector detects the luminosity information of the reflected light beam of the optical device to be measured after being processed by the device for improving the uniformity of the light detector, and outputs the output value corresponding to the luminosity of the reflected light beam of the optical device.

11. The method according to claim 10, characterized in that The light detector determines the output value corresponding to the luminosity of the light beam output by the light source device, including: the light detector determines the output value corresponding to the luminosity of the light beam output by the light source device by a direct calibration method, and / or determines the output value corresponding to the luminosity of the light beam output by the light source device by an indirect calibration method.

12. The method according to claim 11, characterized in that The light detector determines the output value corresponding to the luminosity of the light beam output by the light source device by direct calibration, including: The device for improving the uniformity of the light detector directly receives the light beam output by the light source device, and detects the luminous intensity information of the light beam output by the light source device after being processed by the device for improving the uniformity of the light detector through the light detector, and outputs an output value corresponding to the luminosity of the light beam output by the light source device.

13. The method according to claim 11, characterized in that The light detector determines the output value corresponding to the luminosity of the light beam output by the light source device by an indirect calibration method, including: After the light beam output by the light source device is incident on the standard optical device sample, the reflected light enters the device for improving the uniform responsiveness of the light detector. The light detector detects the photometric information of the reflected light beam of the standard optical device sample after being processed by the device for improving the uniform responsiveness of the light detector, and outputs an output value corresponding to the photometric information of the reflected light beam of the standard optical device sample. Then, the output value corresponding to the photometric information of the reflected light beam of the standard optical device sample is determined by the reflectivity of the standard optical device sample and the output value corresponding to the photometric information of the reflected light beam of the standard optical device sample.

Images