Novel BRDF rapid measurement system

Abstract

The utility model relates to the technical field of BRDF rapid measuring systems, in particular to a novel BRDF rapid measuring system which comprises a base, an annular groove is formed in the base, a semicircular supporting frame is installed in the annular groove, and the axis of the semicircular supporting frame and the circle center of the base are arranged in an overlapped mode. According to the measuring system for rapidly measuring the BRDF distribution data on the surface of the material, the measuring system can be fixed through screws, the measuring angle can be manually changed, and the cost and complexity of the measuring system are greatly reduced while the measuring range and the measuring precision are guaranteed; the system can realize bidirectional reflectance distribution function measurement of a hemispherical space at one time, the measurement time is shorter, and in addition, the device is simple in measurement method, good in repeatability and applicable to measurement of various materials.

Description

TECHNICAL FIELD

[0001] The utility model relates to BRDF fast measuring system technical field especially relates to a novel BRDF fast measuring system. BACKGROUND

[0002] BRDF measuring device as a kind of optical analysis instrument, it has been widely used in target simulation, optical design, space remote sensing, material detection and other fields currently.Brightness refers to the luminous intensity on unit area, and the illuminance refers to the light flux received on unit area.The definition of BRDF is the ratio of the radiance scattered in the specified direction of surface and the irradiance of single incident on the surface.

[0003] The measurement method of BRDF has absolute measurement and relative measurement two kinds.Relative measurement method can reduce system error, and can also play a good inhibitory effect on stray light.Compared with absolute measurement, relative measurement has lower requirement to equipment precision, and can save measurement cost.However, the disadvantage of relative measurement method is also obvious, that is, it must rely on standard reference sample.The complete diffuse reflector has the spectral reflectance of 1 in the whole waveband.Because there is no reference standard with the spectral reflectance of 1 in the whole waveband, in practical application, the BRDF measuring device must be calibrated by using magnesium oxide, barium sulfate, polytetrafluoroethylene or other working standard white board with known absolute spectral reflectance factor after precision calibration, so as to directly measure the BRDF distribution data of the sample to be measured on the instrument.

[0004] The full-angle spectral image BRDF characteristic measuring device and method of three-dimensional body structure target with publication number CN118655083B, the device includes outer circular ring azimuth orbit, inner circular ring azimuth orbit, outer half circular arc zenith slide rail, inner half circular arc zenith slide rail, two zenith slides rotate horizontally and are both provided with zenith trolley, the outer side of the zenith trolley is provided with a light source, the inner side of the zenith trolley is provided with an imaging spectral detector, the upper end of the imaging spectral detector is provided with a light inlet hole, the lower end is provided with an incident light outlet hole and a reflected light inlet hole, a transmission reflection prism is arranged between the two light holes, and a limiting device, a lubricating device and a protection device are matched.When the light source and the imaging spectral detection system are at the same zenith angle and azimuth angle in the hemispherical space, the light emitted by the light source passes through the imaging spectral detector and reaches the detected object, while the collection of reflected light is not affected, and the universality, continuous lubrication and dustproof effect are ensured.

[0005] The disadvantages of the prior art are: 1. Time-consuming, although computer-controlled automatic scanning measurement can improve the measurement speed, but real-time online measurement cannot be realized; 2. The measurement process is easily affected by the change of light source output power and detector responsivity, and the repeatability is poor; 3. The structure is complex, the required cost is high and the limitation conditions are many; therefore, improvement is needed. UTILITY MODEL CONTENT

[0006] The utility model discloses a novel BRDF fast measuring system which is proposed to solve the problems existing in the prior art.

[0007] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0008] A novel BRDF fast measuring system, including base, be equipped with annular recess on the base, install semicircle support frame in the annular recess, the axle of semicircle support frame and the center of base overlap setting;

[0009] The center of base is installed with lifting platform, the upper end of semicircle support frame is equipped with arc slot, the arc slot is detachably connected with emission sliding block and incidence sliding block, and the probe is fixed on the emission sliding block and the incidence sliding block, the emission glass optical fiber is installed on the probe at the upper end of the emission sliding block, and the incidence glass optical fiber is installed on the probe at the upper end of the incidence sliding block.

[0010] Preferably, the lower end of the semicircle support frame is screw-connected with a positioning bolt on both sides, the positioning bolt is arranged through the semicircle support frame, and the lower end of the positioning bolt abuts against the bottom of the base.

[0011] Preferably, a plurality of threaded holes are equidistantly arranged on one side of the bottom of the arc slot, and the bottom of the arc slot is throughly arranged, and the probe extends to the through end of the bottom of the arc slot through the incidence sliding block.

[0012] Preferably, the probe comprises a probe assembly, a light source condensing lens and a fiber connection threaded hole, the fiber connection threaded hole is arranged at one end of the probe assembly connected with the incidence glass optical fiber, and the light source condensing lens is arranged in the arc slot.

[0013] Preferably, the incidence glass optical fiber and the emission glass optical fiber are provided with threads at one end connected with the corresponding probe.

[0014] The utility model discloses the beneficial effects are:

[0015] 1. Expand the measurement range: the novel device aims to cover a wider wavelength range to meet the needs of different materials and application scenarios; in addition to the commonly used angles that can be fixed by screws, the device can also adjust the measurement angle manually to achieve measurement in a larger angle range.

[0016] 2. Reduce cost and complexity: design a manual and low-cost BRDF measurement system to reduce the cost of BRDF measurement; simplify the device structure, reduce unnecessary components, reduce the complexity of the system, and improve reliability and stability.

[0017] 3. Improve the measurement accuracy and precision: using relative measurement method, and using standard whiteboard for comparison, reduce the error in the measurement process, improve the accuracy and precision of measurement;

[0018] 4. Enhance adaptability and flexibility: it can adapt to various measurement environment and condition, such as different light, temperature, etc. Its structure is more compact, smaller size, convenient to carry and transfer. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A structure diagram of a novel BRDF rapid measurement system is proposed for the utility model;

[0020] Figure 2 A structure diagram of a probe in a novel BRDF rapid measurement system is proposed for the utility model;

[0021] Figure 3 A structure diagram of an incident glass optical fiber in a novel BRDF rapid measurement system is proposed for the utility model;

[0022] In the figure: 1, the outgoing glass optical fiber, 2, the outgoing sliding block, 3, the lifting platform, 4, the incident glass optical fiber, 5, the probe, 51, the probe assembly, 52, the light source condenser lens, 53, the optical fiber connecting screw hole, 6, the incident sliding block, 7, the semicircular support frame, 8, the base, 9, the positioning bolt. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0024] Referring to Figures 1-3 A novel BRDF rapid measurement system, comprising a base 8, the base 8 is provided with an annular groove, the annular groove is mounted with a semicircular support frame 7, the axis of the semicircular support frame 7 and the center of the base 8 are overlapped.

[0025] The center of the base 8 is mounted with a lifting platform 3, the upper end of the semicircular support frame 7 is provided with an arc slot, the arc slot is detachably connected with an outgoing sliding block 2 and an incident sliding block 6, the outgoing sliding block 2 and the incident sliding block 6 are both fixed with a probe 5, the outgoing glass optical fiber 1 is mounted on the probe 5 at the upper end of the outgoing sliding block 2, and the incident glass optical fiber 4 is mounted on the probe 5 at the upper end of the incident sliding block 6.

[0026] The bottom of the semicircular support frame 7 is provided with an arc-shaped sliding block, which is in clearance fit with the circular sliding groove of the bottom plate. The semicircular support frame 7 can realize the change of the azimuth angle in the range of 0-360° on the bottom plate. The center of the arc-shaped sliding block is provided with a threaded hole with M3. A positioning bolt 9 can be screwed therein. The positioning bolt 9 can be used to fix the semicircular support frame 7 on the base 8. The semicircular part of the semicircular support frame 7 is provided with an arc-shaped groove with an angle of 0-180°, which is in clearance fit with the sliding block component. The sliding block component can realize the sliding in the range of 0-180° on the arc-shaped groove. The bottom of the arc-shaped groove is provided with a plurality of pairs of threaded holes with M2 on both sides. The sliding block component can be fixed on the semicircular support frame 7 by screws. The angle of one side is 25°, 45°, and 70°, which are the commonly used incident angles. The angle of the other side is 95°, 110°, 120°, 135°, 140°, and 155°, which are the commonly used exit angles.

[0027] The sliding block component is designed as an arc segment. The cross section of the sliding block component is a circular ring section with D68 and D58. The arc angle is 25°. The sliding block component can realize the sliding in the range of 0-180° on the arc-shaped groove. A threaded hole is arranged in the middle, which can be connected with the probe 5.

[0028] One end of the probe 5 is a light source condenser lens 52, which is used to enhance the irradiance of the light source on the sample. The other end is a fiber connection external threaded hole fiber connection threaded hole 53, which is used to connect the glass fiber component.

[0029] The base 8 is a counterweight aluminum alloy plate, which can be fixed on the optical platform by screws. The base 8 is not easy to move during the measurement. A through hole is arranged in the middle. The lifting platform 3 is arranged in the through hole. The semicircular support frame 7 sliding platform and the sliding groove are arranged around the through hole. The semicircular support frame 7 is in clearance fit with the semicircular support frame 7. The bottom of the circular sliding groove is provided with a threaded hole, which can be used to fix the semicircular support frame 7 by screws.

[0030] The lifting platform 3 can be used to adjust the measurement height of the sample. For liquid samples, the sample can be placed on the bottom plate for measurement after uniform coating and film preparation. For solid samples, the sample can be placed on the lifting platform 3 to adjust the height. The sample can be measured after reaching the appropriate position.

[0031] The light source is a JY-L200 halogen lamp, the power of which can be freely adjusted. The adjustment range is 0-100W.

[0032] The computer data processing system can measure, read and save the spectral response intensity of the sample and the white board in real time. The data is processed to obtain the BRDF distribution value of the material surface.

[0033] Reference Figure 1The lower end of the semicircular support frame 7 is screwed with positioning bolts 9 on both sides, the positioning bolts 9 are arranged through the semicircular support frame 7, and the lower end of the positioning bolts 9 abuts against the bottom in the base 8; by rotating the positioning bolts 9, the lower end of the positioning bolts 9 abuts against the bottom in the base 8, and the position of the semicircular support frame 7 can be effectively fixed.

[0034] Referring to Figures 1-2 A plurality of threaded holes are arranged at equal intervals on one side of the bottom in the arc-shaped groove, and the bottom in the arc-shaped groove is throughly arranged; the probe 5 penetrates into the incident sliding block 6 and extends to the through end of the bottom in the arc-shaped groove; the optical fiber connecting threaded hole 53 on the probe 5 can be used to enhance the irradiance of the light source on the sample.

[0035] Referring to Figures 2-3 The probe 5 comprises a probe assembly 51, a light source condenser lens 52 and an optical fiber connecting threaded hole 53; the optical fiber connecting threaded hole 53 is arranged at the end of the probe assembly 51 connected with the incident glass optical fiber 4; the incident glass optical fiber 4 and the exit glass optical fiber 1 are provided with threads at the end connected with the corresponding probe 5, so that the threads on the incident glass optical fiber 4 and the exit glass optical fiber 1 are screw-connected with the optical fiber connecting threaded hole 53 on the corresponding probe 5.

[0036] In the utility model, the semicircular support frame 7 can be fixed in the center of the base 8 by screws, or the azimuth angle can be changed in the range of 0-360°; the incident sliding block 6 and the probe 5 thereon, the exit sliding block 2 and the probe 5 thereon are matched with the semicircular support frame 7 in the arc-shaped groove gap, and the scanning can be realized in the range of 0-180°; the incident angle and the exit angle can be freely set and combined.

[0037] At the common incident angle and exit angle, the threaded holes are arranged, so that the incident sliding block 6 and the exit sliding block 2 can be more conveniently fixed on the semicircular support frame 7; one end of the probe 5 is the light source condenser lens 52 for enhancing the irradiance of the light source on the sample, and the other end is the optical fiber connecting threaded hole 53 for connecting the glass optical fiber.

[0038] The incident sliding block 6 and the probe 5 thereon are connected with the light source through the incident glass optical fiber 4, and the exit sliding block 2 and the probe 5 thereon are connected with the spectrometer through the exit glass optical fiber 1; after the incident angle and the exit angle are selected, the light source is turned on, the sample is placed, the spectrometer is connected with the computer, and after the device is connected, the real-time dynamic spectrum response graph can be seen in the computer data processing system.

[0039] The bottom of the semicircular support frame 7 is provided with an arc-shaped sliding block, which is in clearance fit with the circular sliding groove of the bottom plate. The semicircular support frame 7 can realize the change of the azimuth angle in the range of 0-360° on the bottom plate. The center of the arc-shaped sliding block is provided with a threaded hole with M3. A positioning bolt 9 can be screwed therein. The positioning bolt 9 can be used to fix the semicircular support frame 7 on the base 8. The semicircular part of the semicircular support frame 7 is provided with an arc-shaped groove with an angle of 0-180°, which is in clearance fit with the sliding block component. The sliding block component can realize the sliding in the range of 0-180° on the arc-shaped groove. The bottom of the arc-shaped groove is provided with a plurality of pairs of threaded holes with M2 on both sides. The sliding block component can be fixed on the semicircular support frame 7 by screws. The angle of one side is 25°, 45°, and 70°, which are commonly used incident angles. The angle of the other side is 95°, 110°, 120°, 135°, 140°, and 155°, which are commonly used exit angles.

[0040] The sliding block component is designed as an arc segment. The cross section thereof is a circular ring section with D68 and D58. The arc angle is 25°. The sliding block component can realize the sliding in the range of 0-180° on the arc-shaped groove. A threaded hole is arranged in the middle, which can be connected with the probe 5.

[0041] One end of the probe 5 is a light source condenser lens 52, which is used to enhance the irradiance of the light source on the sample. The other end is a fiber connection external threaded hole fiber connection threaded hole 53, which is used to connect the glass fiber component.

[0042] The base 8 is a counterweight aluminum alloy plate, which can be fixed on the optical platform by screws. It is not easy to move during the measurement. A through hole is arranged in the middle, in which the lifting platform 3 is arranged. The semicircular support frame 7 sliding platform and the sliding groove are arranged around the through hole. The semicircular support frame 7 is in clearance fit with the semicircular support frame 7. The bottom of the circular sliding groove has a threaded hole, which can be used to fix the semicircular support frame 7 by screws.

[0043] The lifting platform 3 can be used to adjust the measurement height of the sample. For liquid samples, after uniform film coating and sample preparation, the sample can be placed on the bottom plate for measurement. For solid samples, the height of the sample can be adjusted on the lifting platform 3. After reaching the appropriate position, the sample can be measured.

[0044] The light source is a halogen lamp, the power of which can be freely adjusted.

[0045] The computer data processing system can measure and read the spectral response intensity of the sample and the white plate in real time, process the data, and finally obtain the BRDF distribution value of the material surface.

[0046] The above BRDF rapid measurement system comprises the following steps:

[0047] Calibration method: the calibration method of the relative measurement of the BRDF measuring device is generally that a incident angle, an exit angle, the average number of times is set, the standard white board is placed in the measuring port of the instrument, the measurement is performed, the exposure time is changed so that the maximum value of the spectral response intensity of the white board is between 50000-60000J, the exit angle is changed by moving the exit probe 5, the spectral response intensity of the white board at different exit angles is unchanged, the measurement error caused by changes in optical elements, mechanical structure and electronics is corrected, and the measurement of the measured object is performed after the calibration is completed; here, the relative position of the standard white board and the instrument and the relative position of the measured object and the instrument are required to be the same to ensure the same measurement conditions.

[0048] Measurement steps:

[0049] Step 1: build the system, select an azimuth angle, fix the semicircular support frame 7 on the base 8, connect the slide block part, the probe 5 and the optical fiber part, randomly select an incident angle, fix it, then select an exit angle, connect the spectrometer, adjust the light source power to the maximum, and make sure that the light source focal point of the incident slide block 6 and the probe 5 thereon is located in the measured area of the surface of the standard white board; set the average number of times of the spectrometer, the exposure time, place the standard white board on the platform base or the telescopic platform, adjust to the appropriate height so that the sample surface is coincident with the plane of the base plate, perform the measurement, change the exposure time so that the maximum value of the spectral response intensity of the white board is between 50000-60000J, change the exit angle by moving the exit probe 5, observe the peak value of the spectral response intensity, and the spectral response intensity of the standard white board at different exit angles is basically unchanged, and the calibration measurement of the device is completed; Step 2: after the incident angle of the sample is determined, the incident slide block 6 and the probe 5 thereon are fixed, and the exit angle is determined and fixed, the exit slide block 2 and the probe 5 thereon are fixed, the standard white board is measured first, and it must be ensured that the measurement position is the same as that in the calibration, the peak value of the spectral response intensity is observed, and whether it is basically unchanged with the peak value in the calibration is observed, and the spectral response data is saved when it is basically unchanged, the measuring device is kept stationary, the incident angle and the exit angle are unchanged, the sample is replaced for measurement, and the spectral response data of the sample is saved; Step 3: change the incident angle or the exit angle, repeat the above measurement process, ensure that the standard white board and the sample are measured at the same position at each angle, which can reduce the measurement error, and the spectral response intensity of the standard white board and the spectral response intensity of the sample at different incident angles and exit angles are obtained; Step 4: the obtained data is processed in the computer processing system, and the BRDF distribution data of the sample at different incident angles and exit angles can be obtained.

[0050] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A novel BRDF fast measurement system comprising a base (8) characterised in that: The base (8) is provided with an annular groove, and a semicircular support frame (7) is mounted in the annular groove, with the axis of the semicircular support frame (7) and the center of the base (8) being arranged in overlap. A lifting platform (3) is mounted at the center of the base (8), an arc slot is formed at the upper end of the semicircular support frame (7), and an exit sliding block (2) and an entrance sliding block (6) are detachably connected in the arc slot; a probe (5) is fixed on the exit sliding block (2) and the entrance sliding block (6); an exit glass optical fiber (1) is mounted on the probe (5) at the upper end of the exit sliding block (2); and an entrance glass optical fiber (4) is mounted on the probe (5) at the upper end of the entrance sliding block (6).

2. The novel BRDF fast measurement system according to claim 1, characterized in that: Positioning bolts (9) are screwed at both sides of the lower end of the semicircular support frame (7), the positioning bolts (9) are arranged through the semicircular support frame (7), and the lower ends of the positioning bolts (9) abut against the bottom of the base (8).

3. The novel BRDF fast measurement system according to claim 1, characterized in that: A plurality of threaded holes are equidistantly formed at the bottom of the arc slot, and the bottom of the arc slot is throughly arranged; the probe (5) penetrates through the entrance sliding block (6) and extends to the through end of the bottom of the arc slot.

4. The novel BRDF fast measurement system according to claim 1, characterized in that: The probe (5) comprises a probe assembly (51), a light source condensing lens (52) and a fiber connection threaded hole (53); the fiber connection threaded hole (53) is arranged at the end of the probe assembly (51) connected with the entrance glass optical fiber (4); and the light source condensing lens (52) is arranged in the arc slot.

5. The novel BRDF fast measurement system according to claim 1, characterized in that: The entrance glass optical fiber (4) and the exit glass optical fiber (1) are provided with threads at the ends connected with the corresponding probes (5).

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