Radiation brightness measurement field angle calibration device of photobiological safety test system

Abstract

The utility model discloses a field angle calibration device for radiance measurement of a photo-biological safety test system, which comprises an integrating sphere light source, and a field angle standard size plate is detachably mounted on one side of a light outlet of the integrating sphere light source through a rotating component. According to the utility model, an existing integrating sphere standard light source structure is improved, and the turnable and light-permeable field angle standard size plate is innovatively designed; when the system is used for radiance calibration, the field angle standard size plate is rotated away, and the integrating sphere standard light source can be used independently. When the calibration device is used for radiance measurement field angle calibration, the field angle standard size plate is rotated to a corresponding position, and then the field angle standard size plate can be combined with the integrating sphere standard light source. Therefore, due to the arrangement of the turnable field angle standard size plate, the integration of the radiance and the measurement field angle calibration device is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of photobiological safety testing, in particular to a radiance measurement viewing angle calibration device for a photobiological safety testing system. Background Art

[0002] The photobiological safety test system is mainly used to test and evaluate the radiation hazards of light radiation (generally referring to the wavelength range of 200nm to 3000nm) to human eyes and skin. By testing the spectral irradiance and spectral radiance under specific conditions, various types of light radiation hazards are evaluated, mainly including photochemical ultraviolet hazards to skin and eyes, near-ultraviolet hazards to eyes, retinal blue light hazards, retinal thermal hazards, infrared radiation hazards to eyes and skin thermal hazards. Many products in the fields of lighting, display, medical health, etc., such as ultraviolet disinfection products, lighting fixtures, electronic display products, infrared health products, etc., need to be evaluated for photobiological safety. In particular, some products have high light radiation intensity and diverse forms, such as eye-wear, helmet-wear, skin-contact and other wearable products that are used close to people and have complex contact forms. Their photobiological safety should attract more attention. Therefore, the photobiological safety test system is needed in the product development, production, inspection and other stages to evaluate the light radiation hazards of the product and give corresponding usage recommendations.

[0003] At present, there are corresponding technical standards for photobiological safety testing at home and abroad. The International Council on Illumination (CIE), the International Electrotechnical Commission (IEC), etc. have requirements for measurement parameters, measurement wavelength range, radiance field angle, etc. for different types of exposure hazards, such as IEC / EN62471 and GB / T20145 Photobiological safety of lamps and lamp systems (see GB / T20145-2006 Photobiological safety of lamps and lamp systems; JJG211-2021 Verification Procedure for Luminance Meters JJF1975-2022 Calibration Specification for Spectroradiometers, etc.). However, up to now, there is no unified photobiological safety test system and its metrological technical specifications on the market, making it impossible to effectively trace the value of the photobiological safety test system. Some metrological technical institutions may only treat it as a spectrometer for routine calibration, but do not conduct targeted and comprehensive metrological calibration for each indicator of the photobiological safety test system. In particular, the tests for retinal thermal hazards and retinal blue light hazards in photobiological safety tests have requirements for the measurement field angle of the radiance probe, and the accuracy of measuring the field angle when calibrating the radiance is often overlooked. Radiance, also known as radiance, is a physical quantity that measures the strength of a surface light source, and describes the radiation flux per unit projection area and per unit solid angle. The measured field angle is the angle between the two lines formed by the edge of the sample's measurement field and the light receiving position of the test system during the radiance test. The lack of calibration specifications has led to differences in the calibration items and methods of the photobiological safety test system, which in turn affects the accuracy and rationality of the product's photobiological safety evaluation level, which is closely related to the safety of consumers using the product.

[0004] The radiance calibration of the photobiological safety test system can generally refer to the JJG211-2021 luminance meter calibration procedures, such as Figure 1 As shown, an integrating sphere standard light source / integrating sphere light source is used, the position of the radiance probe is adjusted so that the photometric axis of the probe is perpendicular to the light outlet surface of the standard light source, the center of the light outlet of the light source is located at the center of the radiance measurement field of view, and the focal length of the test system is adjusted so that the light outlet surface of the light source has a clear image.

[0005] For example, the invention patent with publication number CN108827460A discloses a radiance probe and an optical measurement system, which includes: a light input unit, including a transparent light-transmitting sheet, a lens and an optical fiber, for collecting light; an optical sensing unit, which performs spectroscopic processing on the light from the light input unit and converts light of each wavelength into a corresponding current signal; a current regulating unit, which is used to regulate the current signal; and a data acquisition unit, which integrates the regulated current signal and converts it into a voltage signal to convert it into light intensity values ​​of different wavelengths. Another example is the invention patent with publication number CN103776531A, which discloses a near-infrared weak pulse spectral radiance calibration device, which includes a light source component for calibrating a grating spectrometer, an optical fiber component containing an array optical fiber bundle, a computer equipped with a spectral radiance calibration data processing software package, and a grating spectrometer containing a flat-field concave grating and an area array EMCCD; the input end of the array optical fiber bundle is a single optical fiber, and the output end contains n optical fibers arranged in a line; the pulse light beam emitted by the measured pulse light source is dispersed by the flat-field concave grating after passing through the optical fiber component and the slit, and the dispersed light is focused on the photosensitive surface of the area array EMCCD to form n-line spectra, the computer collects the n-line spectra and obtains the spectral radiance value of the measured pulse light source that varies with wavelength according to the spectral radiance calculation formula, and displays a single or multiple spectral radiance curves on the computer screen.

[0006] The above-mentioned prior art device can only be used for calibrating radiance, but cannot calibrate the field angle of radiance measurement. The field angles of different optical instrument lenses will be different, such as the field angle of a telescope is generally 45-60 degrees, the field angle of an optical microscope is generally 45 degrees, and the field angle of a photographic lens is generally 65-84 degrees. The measurement of these field angles is generally that the optical instrument under test measures a specific target image, and the edge reading of the imaging is obtained through the human eye or an image acquisition module to obtain its maximum observation range and field angle. For wide-angle, fisheye and other large-field lenses (generally greater than 120°) used in cameras, a rotating table is used for measurement. The lens is fixed on the rotating table, and the distance between the test lens surface and the test chart is 500mm. The rotating table is rotated to read the angle values ​​when the vertical markings of the test chart appear on the leftmost and rightmost sides of the display interface. The difference between the two is the field angle.

[0007] Due to the different application fields of lenses, when calibrating the photobiological safety test system, the radiance probe cannot be tested as a single lens, but needs to be calibrated comprehensively as a whole system. The object measured by the test system is a luminous body, which needs to have a certain brightness. If it is just a single image or chart, the radiance probe cannot measure it. In addition, the radiance measurement field angle of the system is generally small (1mrad-110mrad), and the measurement field range is black in the imaging observation area. The edge indication cannot be clearly judged during the movement of the measured image, so the existing technology is not suitable for the calibration of the radiance probe measurement field angle of the photobiological safety test system.

[0008] In addition, in order to ensure the accuracy and consistency of the measured values ​​of the measuring instrument, the prior art mainly adopts the method of regularly calibrating the measuring instrument to achieve it. For example, an invention patent with a publication number of CN112840182A discloses a method for monitoring a spectroradiometer, and an invention patent with a publication number of CN107209059A discloses a method for calibrating a spectroradiometer. Both adopt the method of regularly calibrating the measuring instrument (such as a spectroradiometer). Although the synchronization of the spectroradiometer is achieved, in the case of a measurement object with the same radiation spectrum, the spectroradiometers working in parallel provide basically the same light measurement data (spectral intensity distribution, chromaticity parameters and photometric parameters), thereby ensuring the uniform quality of the product to a certain extent. However, in the actual occasion of photobiological safety testing, in addition to the application of the measuring instrument, it is also necessary to equip a light source, a radiance probe and other equipment to form an optical system. When the measurement personnel conduct the photobiological safety test, they all build the optical system based on their own experience, resulting in different measurement results of the same product under the operation of different measurement personnel. Utility Model Content

[0009] A brief overview of embodiments of the present invention is given below in order to provide a basic understanding of certain aspects of the present invention. It should be understood that the following overview is not an exhaustive overview of the present invention. It is not intended to identify key or important parts of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0010] In order to solve the technical problems mentioned in the above background technology, the idea of ​​the utility model is to provide a radiance measurement field angle calibration device for a photobiological safety testing system, which is used to assist in ultra-small measurement field angle and radiance calibration detection, thereby obtaining more scientific and comparable technical indicator data.

[0011] According to one aspect of the present application, a radiance measurement field angle calibration device for a photobiological safety test system is provided, which cooperates with a radiance probe to achieve calibration, the radiance probe includes an optical component for collecting light, and the field angle calibration device includes an integrating sphere light source, and a field angle standard size plate is detachably installed on one side of the light outlet of the integrating sphere light source through a rotating component; the optical axis of the radiance probe is perpendicular to the light outlet surface of the integrating sphere light source, and the light of the integrating sphere light source enters the radiance probe through the field angle standard size plate; the field angle standard size plate includes a glass substrate, and the glass substrate is engraved with grid lines as a first scale, and the geometric center of the glass substrate is also provided with scale lines as a second scale in the horizontal and vertical directions, and the first scale is greater than the value of the second scale. The field angle standard size plate is used to realize the calibration of the field angle of radiance measurement, the grid lines of the first scale can be used for focusing the radiance probe, and the minimum graduation value of the scale lines of the second scale is 0.1mm, which can be used to determine the measurement field range.

[0012] As a further solution, the rotating component includes a bracket fixedly mounted on one side of the light outlet, and a slot for mounting a standard size plate of the field angle is provided on the bracket through a rotating shaft, and the slot can be flipped up and down or left and right along the bracket. When only radiance calibration is performed, the slot can be rotated open, and the light outlet is directly aligned with the radiance probe; when measuring the field angle calibration, the standard size plate of the field angle is inserted into the slot, and then the slot is flipped to the position of the light outlet. After the standard size plate of the field angle is inserted into the slot, it can be rotated in the slot to adjust the angular position of the size plate and fixed inside the slot. The rotating component can also be implemented by other structures, as long as the standard size plate of the field angle can be flipped.

[0013] Furthermore, the whole of the standard size plate of the field angle is a centrally symmetrical figure, such as a circle, a rectangle, a rhombus, a square, or a parallelogram. Since the light outlet of the integrating sphere light source is generally circular, the whole of the standard size plate of the field angle is preferably a circular plate. Correspondingly, the slot is an arc slot, which can be flipped up and down or left and right along the bracket; a track is formed in the arc slot in the direction of its arc extension, and the circular plate can rotate in the track.

[0014] As a further solution, the rotation axis of the bracket and the position of the light outlet are fixed tightly or loosely by screws, so that the standard size plate bracket and the integrating sphere light source can be fixed together or separated.

[0015] As a further solution, for more convenient calibration, a support rod is further provided under the arc-shaped slot of the bracket, the upper part of the support rod is provided with an arc-shaped slot, and the lower part of the support rod is fixed on the optical track. As a specific implementation scheme, a screw hole is provided under the arc-shaped slot of the bracket, the upper part of the support rod is fixed to the screw hole by a screw, and the bottom of the support rod is fixed to the optical track of the optical biological safety test system by a screw, so that when the standard size plate is separated from the integrating sphere light source, the standard size plate can be moved separately to calibrate the field of view angle.

[0016] Furthermore, the light entrance of the integrating sphere light source is provided with an adjustable aperture.

[0017] Furthermore, the integrating sphere light source is located on a three-dimensional moving platform.

[0018] According to another aspect of the present application, a calibration method for the above-mentioned radiance measurement field angle calibration device of the photobiological safety testing system is provided, including a radiance calibration method and a field angle calibration method, wherein the field angle calibration method includes:

[0019] Step 1. Turn the card slot over and place it at the light outlet of the integrating sphere light source;

[0020] Step 2. Insert the standard size plate of field angle into the card slot, rotate the standard size plate of field angle to adjust the angle position and fix it;

[0021] Step 3. Turn on the control power of the integrating sphere light source, and the light will enter the radiance probe through the standard size plate of the field angle, and the image of the standard plate can be seen on the objective lens or display;

[0022] Step 4. Fix the distance between the field angle standard size plate and the radiance probe, and adjust the focal length of the radiance probe so that the field angle standard size plate has a clear image in the measurement field of view;

[0023] Step 5. Use a three-dimensional mobile platform to adjust the calibration device (photobiological safety test system radiance measurement field angle calibration device, referred to as the calibration device) up, down, left, and right positions so that the center point of the field angle standard size plate coincides with the center of the field of view range of the radiance probe;

[0024] Step 6. Set the measurement field of view of the radiance probe, present the corresponding measurement field of view (black) on the objective lens or display, rotate the field of view standard size plate so that the scale on the size plate can be located at the edge of the measurement field of view, read the scale value on the size plate corresponding to the edge of the measurement field of view, and then calculate the measurement field of view angle 1 through the trigonometric function relationship of the measurement distance.

[0025] Furthermore, the field of view angle calibration method further includes:

[0026] Step 7. Place the calibration device at the first position and the second position in sequence, readjust the focal length to make the image clear, repeat step 6 to read the scale value, and calculate the measurement field of view angle 2 and the measurement field of view angle 3 respectively;

[0027] Step 8. Take the average of the measurement field angle 1, the measurement field angle 2 and the measurement field angle 3 as the standard measurement field angle. In addition, by comparing with the set field angle, the measurement field angle indication error can be obtained, and the measurement field angle calibration of the radiance probe can be completed.

[0028] Furthermore, the radiance calibration method includes:

[0029] Step 1. Flip the card slot to the light outlet of the integrating sphere light source;

[0030] Step 2. Insert the standard size plate of field angle into the card slot and fix it;

[0031] Step 3. Turn on the control power of the integrating sphere light source, and the light will enter the radiance probe through the standard size plate of the field angle, and the image of the standard plate can be seen on the objective lens or display;

[0032] Step 4. Fix the distance between the field angle standard size plate and the radiance probe, and adjust the focal length of the radiance probe so that the field angle standard size plate has a clear image in the measurement field of view;

[0033] Step 5. Use the three-dimensional mobile platform to adjust the calibration device up, down, left, and right positions so that the center point of the field of view standard size plate coincides with the center of the field of view range of the radiance probe;

[0034] Step 6. Flip the card slot to the outside of the light outlet of the integrating sphere light source;

[0035] Step 7. Set the brightness of the integrating sphere light source, obtain the spectral radiance test value through the photobiological safety test system, integrate according to the calibration band range such as ultraviolet, blue light, infrared, and obtain the radiance test value of the corresponding band. Compare it with the radiance standard value of the integrating sphere light source to get the radiance indication error.

[0036] The utility model has the following advantages through the above scheme:

[0037] 1. Improve the existing integrating sphere standard light source structure, and innovatively design a flippable and light-transmissive field angle standard size plate; when used for radiance calibration, turn the field angle standard size plate away, and the integrating sphere standard light source can be used alone. When used for radiance measurement field angle calibration, turn the field angle standard size plate to the corresponding position, and it can be combined with the integrating sphere standard light source. Therefore, the setting of the flippable field angle standard size plate realizes the integration of the radiance and its measurement field angle calibration device.

[0038] 2. The standard size plate of field angle is light-transmissive and rotatable. The grid lines and scales on it can be used for coarse focusing of the calibrated equipment and calibration readings of ultra-small measurement field angles;

[0039] 3. The standard size plate of field of view angle can be directly fixed and measured at different distances. The measured field of view angles at different distances are obtained and then the average value is taken as the standard measured field of view angle, instead of repeatedly measuring multiple times at one distance and taking the average value;

[0040] 4. In addition, by setting the support rod, when the standard size plate of the field angle is separated from the integrating sphere light source, the standard size plate can be moved separately to calibrate the field angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention can be better understood by referring to the following description in conjunction with the accompanying drawings, wherein the same or similar reference numerals are used in all drawings to represent the same or similar components. The accompanying drawings together with the following detailed description are included in and form a part of this specification, and are used to further illustrate the preferred embodiments of the present invention and explain the principles and advantages of the present invention. In the accompanying drawings:

[0042] Figure 1 It is a schematic diagram of radiance calibration in the prior art;

[0043] Figure 2 It is a schematic diagram of a standard size plate of viewing angle of the utility model;

[0044] Figure 3 It is a side view of the calibration device of the utility model (integrating sphere light source and field angle standard size plate);

[0045] Figure 4 This is a front view of the outlet of the integrating sphere of the utility model (including the card slot);

[0046] Figure 5 This is a schematic diagram of the direction of inserting the standard size plate of the viewing angle into the card slot of the utility model;

[0047] Figure 6 It is a calibration diagram of the utility model;

[0048] In the figure, 1 is an integrating sphere light source, 2 is a radiance probe, 11 is a standard size plate (field angle standard size plate, may be referred to as standard size plate), 12 is a baffle, 13 is a light outlet, 14 is a light entrance, 15 is an adjustable grating, 16 is an arc slot, 17 is a rotating shaft, 18 is a fixing screw. DETAILED DESCRIPTION

[0049] Embodiments of the present invention will be described below with reference to the accompanying drawings. Elements and features described in one drawing or one embodiment of the present invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that for the purpose of clarity, the representation and description of components and processes that are not related to the present invention and are known to those of ordinary skill in the art are omitted in the drawings and descriptions.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0051] Therefore, the existing technology is not suitable for the calibration of the field angle measurement of the radiance probe of the photobiological safety test system. Therefore, the problem to be solved by the utility model is the calibration of the ultra-small measurement field angle (1mrad-110mrad) of the radiance probe of the photobiological safety test system, and it can be combined with the calibration of the radiance to achieve the calibration of two parameters with one set of equipment. The size plate used for field angle calibration must be luminous or translucent in itself, and needs to be used in combination with an external light source. The size plate needs to be rotatable to adapt to the problem that certain measurement field angle ranges cannot be fully displayed in the measurement software view, and the appropriate rotation angle can be adjusted according to the specific measurement range display. The external light source can use an integrating sphere light source, but the light source can adjust the brightness through an aperture to meet the measurement range of the radiance probe.

[0052] In order to achieve the calibration of the radiance measurement field angle, the first embodiment of the utility model includes a glass field angle standard size plate, such as Figure 2 As shown, it includes a glass substrate, on which grid lines as a first scale are engraved, and the geometric center of the glass substrate is also provided with scale lines as a second scale in the horizontal and vertical directions, and the first scale is larger than the value of the second scale. The grid lines with a larger scale can be used for focusing the radiance probe, and the scale lines with a smaller scale have a minimum division value of 0.1 mm, which can be used to determine the measurement field range.

[0053] like Figure 3As shown, by combining it with an integrating sphere light source, the integration of the radiance and its measurement field angle calibration device can be realized. When used alone, the integrating sphere light source 1 can be used for calibrating the radiance. When used in conjunction with the field angle standard size plate 11, it can be used for calibrating the field angle of radiance measurement. The light inlet 14 of the integrating sphere light source 1 has an adjustable aperture 15, which can adjust the brightness of the light source. The light from the integrating sphere light source 1 is a uniform surface light source, which enters the radiance probe 2 through the field angle standard size plate 11 and can be imaged on the display.

[0054] The front view of the integrating sphere at the light outlet is as follows: Figure 4 As shown, a bracket with an arc-shaped slot 16 is fixed on one side of the light outlet 13, and the arc-shaped slot 16 can be flipped back and forth along the rotation axis 17. When only radiance calibration is performed, the bracket can be rotated open, and the light outlet is directly aligned with the radiance probe; when measuring the field of view angle calibration, the bracket can be closed to the light outlet position, and the field of view angle standard size plate can be inserted into the arc-shaped slot. The schematic diagram of the direction of inserting the field of view angle standard size plate into the arc-shaped slot is shown in Figure 5 As shown, the viewing angle standard size plate can be inserted into the arc-shaped slot, and can be rotated in the arc-shaped slot to adjust the angle position of the viewing angle standard size plate, and fixed inside the arc-shaped slot. The entire device is located on a three-dimensional mobile platform.

[0055] The utility model designs a transparent glass field angle standard size plate, which is light-transmissive and rotatable. The grid lines and scales on it can be used for the coarse focus adjustment of the calibrated equipment and the calibration reading of the ultra-small measurement field angle, which can assist the standard test of the photobiological safety test, so that the measurement results of the same product have the same test results under the operation of different measurement personnel, thereby obtaining more scientific and comparable technical indicator data. In addition, the field angle standard size plate of the utility model is combined with an integrating sphere light source to realize the calibration of the ultra-small measurement field angle of the radiance probe, and can realize the calibration of two parameters (radiance and measurement field angle) with one set of equipment.

[0056] The second embodiment of the utility model provides a radiance measurement field angle calibration device for a photobiological safety testing system, which includes a radiance probe and an integrating sphere light source. The above-mentioned field angle standard size plate is detachably installed on one side of the light outlet of the integrating sphere light source through a rotating component.

[0057] In this embodiment, as a feasible implementation scheme, the rotation axis of the bracket and the position of the light outlet are fixed tightly or loosely by screws, so that the standard size plate bracket and the integrating sphere light source can be fixed together or separated.

[0058] As a feasible implementation scheme, for more convenient calibration, a support rod is further provided under the arc-shaped slot of the bracket, the upper part of the support rod is provided with an arc-shaped slot, and the lower part of the support rod is fixed on the optical track. Specifically, a screw hole is provided under the arc-shaped slot of the bracket, the upper part of the support rod is fixed to the screw hole by a screw, and the bottom of the support rod is fixed to the optical track of the optical biological safety test system by a screw, so that when the standard size plate is separated from the integrating sphere light source, the standard size plate can be moved separately to calibrate the field of view angle.

[0059] The third embodiment of the present invention provides a method for calibrating the viewing angle of a radiance measurement system for a photobiological safety test. The calibration method is applied to the calibration device of the second embodiment and comprises the following steps:

[0060] Step 1. Rotate the arc slot and place it at the light outlet of the integrating sphere light source;

[0061] Step 2. Insert the standard size plate of field angle into the card slot, adjust the angle position of the size plate and fix it;

[0062] Step 3. Turn on the integrating sphere light source control power supply and adjust the aperture so that enough light can pass through the field angle standard size plate into the radiance probe and form an image on the objective lens or display;

[0063] Step 4. Fix the distance between the field angle standard size plate and the radiance probe, and adjust the focal length of the radiance probe so that the field angle standard size plate has a clear image in the measurement field of view;

[0064] Step 5. Use the three-dimensional mobile platform to adjust the calibration device up, down, left, and right positions so that the center point of the field of view standard size plate coincides with the center of the field of view range of the radiance probe;

[0065] Step 6. Set the measurement field angle of the radiance probe, present the corresponding measurement field (black) on the objective lens or display, rotate the field angle standard size plate so that the scale on the size plate can be located at the edge of the measurement field, read the scale value on the size plate corresponding to the edge of the measurement field, and then calculate the measurement field angle 1 through the trigonometric function relationship of the measurement distance;

[0066] Step 7. Place the calibration device at 0.5m and 0.2m respectively, readjust the focal length to make the image clear, read the scale value according to step 5 and calculate the measurement field angles 2 and 3;

[0067] Step 8. Measure the viewing angles 1, 2 and 3 and take the average value as the standard viewing angle. Compare with the set viewing angle to get the error of the viewing angle indication, and complete the calibration of the radiance probe. The viewing angle standard size plate of the utility model can be directly fixed and measured at different distances, and the measured viewing angles at different distances are obtained and then the average value is taken as the standard viewing angle, instead of repeatedly measuring multiple times at one distance and taking the average value.

[0068] The radiance calibration method of the calibration device of this embodiment specifically includes the following steps:

[0069] Step 1. Flip the card slot to the light outlet of the integrating sphere light source;

[0070] Step 2. Insert the standard size plate of field angle into the card slot and fix it;

[0071] Step 3. Turn on the control power of the integrating sphere light source, and the light will enter the radiance probe through the standard size plate of the field angle, and the image of the standard plate can be seen on the objective lens or display;

[0072] Step 4. Fix the distance between the field angle standard size plate and the radiance probe, and adjust the focal length of the radiance probe so that the field angle standard size plate has a clear image in the measurement field of view;

[0073] Step 5. Use the three-dimensional mobile platform to adjust the calibration device up, down, left, and right positions so that the center point of the field of view standard size plate coincides with the center of the field of view range of the radiance probe;

[0074] Step 6. Flip the card slot to the outside of the light outlet of the integrating sphere light source;

[0075] Step 7. Set the brightness of the integrating sphere light source, obtain the spectral radiance test value through the photobiological safety test system, integrate according to the calibration band range such as ultraviolet, blue light, infrared, and obtain the radiance test value of the corresponding band. Compare it with the radiance standard value of the integrating sphere light source to get the radiance indication error.

[0076] In the prior art photobiological safety test system, the existing single measurement image or chart is generally used directly. Without light of sufficient brightness, the radiance probe cannot clearly image the measurement image. To solve this problem, for the calibration of the radiance probe of the photobiological safety test system, in order to meet the calibration of the ultra-small measurement field angle, the utility model designs the field angle standard size plate to be glass and light-transmissive, and is used in combination with an integrating sphere light source. The brightness of the integrating sphere light source can be adjusted so that the light passing through the field angle standard size plate can meet the measurement range of the radiance probe, so that a clear image can be formed on the test system objective or display.

[0077] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0078] Although the utility model has been disclosed above through the description of the specific embodiments of the utility model, it should be understood that all the above embodiments and examples are exemplary rather than restrictive. Those skilled in the art can design various modifications, improvements or equivalents of the utility model within the spirit and scope of the attached claims. These modifications, improvements or equivalents should also be considered to be included in the protection scope of the utility model.

Claims

1. A radiance measurement field angle calibration device for a photobiological safety test system, characterized in that: It cooperates with a radiance probe to achieve calibration. The radiance probe includes an optical component for collecting light. The field angle calibration device includes an integrating sphere light source. A field angle standard size plate is detachably installed on one side of the light outlet of the integrating sphere light source through a rotating component. The optical axis of the radiance probe is perpendicular to the light outlet surface of the integrating sphere light source. The light from the integrating sphere light source enters the radiance probe through the field angle standard size plate. The standard size plate of viewing angle is a centrally symmetrical figure; The viewing angle standard size plate comprises a glass substrate, on which grid lines as first scales are engraved, and the geometric center of the glass substrate is also provided with scale lines as second scales in horizontal and vertical directions, and the first scale is larger than the second scale in magnitude.

2. The radiance measurement field angle calibration device for a photobiological safety testing system according to claim 1, characterized in that: The rotating component comprises a bracket fixedly mounted on one side of the light outlet, and a slot for mounting a standard-size plate of a viewing angle is provided on the bracket through a rotating shaft, and the slot is flipped up and down or left and right along the bracket.

3. The radiance measurement field angle calibration device for a photobiological safety testing system according to claim 2, characterized in that: The viewing angle standard size plate is a circular plate as a whole.

4. The radiance measurement field angle calibration device for a photobiological safety testing system according to claim 3, characterized in that: The slot is an arc-shaped slot, which turns upside down or left-right along the bracket; a track is formed in the arc-shaped slot in the direction in which the arc extends, and the circular plate can rotate in the track.

5. The radiance measurement field angle calibration device for a photobiological safety testing system according to claim 4, characterized in that: The rotation axis of the bracket and the light outlet position are fixed by screws.

6. The radiance measurement field angle calibration device for a photobiological safety testing system according to claim 4, characterized in that: A support rod is also arranged under the arc-shaped slot of the bracket, the upper part of the support rod is provided with the arc-shaped slot, and the lower part of the support rod is fixed on the optical track.

7. The radiance measurement field angle calibration device for a photobiological safety testing system according to claim 1, characterized in that: The light entrance of the integrating sphere light source is provided with an adjustable aperture.

8. The radiance measurement field angle calibration device for a photobiological safety testing system according to claim 1, characterized in that: The integrating sphere light source is located on a three-dimensional moving platform.

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