CN116136496A - BRDF measurement system based on parabolic reflector - Google Patents
BRDF measurement system based on parabolic reflector Download PDFInfo
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- CN116136496A CN116136496A CN202310350790.5A CN202310350790A CN116136496A CN 116136496 A CN116136496 A CN 116136496A CN 202310350790 A CN202310350790 A CN 202310350790A CN 116136496 A CN116136496 A CN 116136496A
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- 238000005259 measurement Methods 0.000 title claims abstract description 37
- 239000000463 material Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005315 distribution function Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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Abstract
The invention discloses a BRDF measuring system based on a parabolic reflector, which comprises a parabolic reflector, a plane reflector and a motion control unit, wherein the parabolic reflector comprises a first parabolic reflector and a second parabolic reflector, the plane reflector comprises a plane reflector which can move and be fixed in the vertical direction, the motion control unit comprises a linear guide rail, a circular guide rail and a motor, the first parabolic reflector is arranged on the circular guide rail, the second parabolic reflector is arranged on a bottom plate, the plane reflector which can move in the vertical direction is arranged on the linear guide rail, when the relative heights of the parabolic reflector and the plane reflector are changed, the positions of light spots on the parabolic reflector are different to change the zenith angle of a light beam, the circular guide rail changes the azimuth angle of incident light, and the motor changes the azimuth angle of reflected light; the invention has simple structure and can effectively realize BRDF measurement through the parabolic reflector.
Description
Technical Field
The invention belongs to the technical field of BRDF (bidirectional reflectance distribution function) measurement, and particularly relates to a BRDF measurement system based on a parabolic reflector.
Background
With rapid development of target recognition, computer graphics and precision optical systems, the optical scattering property of the material surface is attracting more and more attention in various fields. BRDF is the ratio of the brightness of reflected light in one direction to the brightness of incident light in the other direction on the surface of a material, and can better represent the optical scattering property of the surface of the material. The BRDF measurement is the scattering information of hemispherical space on the surface of the digital material, and mainly comprises angular resolution measurement, total integral measurement, imaging measurement and the like.
The prior art has wider application to the angular resolution type BRDF measurement, for example, a light source and a detector are fixed on a bracket, and the bracket is driven by a motor to respectively realize hemispherical space movement of the light source and the detector on the surface of a sample. The light source and the detector move to different space positions, so that incidence of light beams in different directions and detection of reflected light in different directions are realized. The prior angle resolution type BRDF measurement is mainly focused on visible light wave bands and single infrared wave bands, the light source and the detector are light and handy, and the movement in the hemispherical space of the sample surface can be realized by following a movement mechanism. However, for BRDF measurement in the continuous infrared band, the light source and the detector are large and cannot be mounted on a bracket, so that light beams cannot be incident in any direction and reflected light in any direction cannot be detected.
Disclosure of Invention
In view of this, the present invention provides a BRDF measurement system based on a parabolic mirror including a first parabolic mirror and a second parabolic mirror, the parabolic mirror including a plane mirror movable and fixed in a vertical direction, a plane mirror including a linear guide and a circular guide, and a motor, the first parabolic mirror being mounted on the circular guide, the second parabolic mirror being mounted on a base plate, the plane mirror movable in a vertical direction being mounted on the linear guide, the motor being fixed on the base plate to carry a sample, positions of spots on the parabolic mirror being different to change zenith angles of light beams when relative heights of the parabolic mirror and the plane mirror are changed, the circular guide changing azimuth angles of incident light, and the motor changing azimuth angles of reflected light; the invention is suitable for the situation that the light source and the detector cannot move in space at will, simplifies the control method of zenith angle and azimuth angle of the light beam, avoids complex corner structure, can continuously control the direction of the light beam, has simple structure, and can effectively realize BRDF measurement through the parabolic reflector.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a BRDF measuring system based on a parabolic reflector comprises a zenith angle control unit of a light beam formed by a plane reflector and the parabolic reflector, an azimuth angle control system of the light beam formed by a motor and a circular guide rail, wherein the zenith angle control unit comprises an incident light zenith angle control unit and a reflected light zenith angle control unit; the incident light zenith angle control unit comprises a first parabolic mirror, a second plane mirror and a third plane mirror, the reflected light zenith angle control unit comprises a second parabolic mirror, a first plane mirror, a fourth plane mirror and a fifth plane mirror, the first plane mirror is arranged on a first linear guide rail, the fifth plane mirror is arranged on a third linear guide rail, the second plane mirror is arranged on a second linear guide rail, the third plane mirror is arranged on a circular guide rail, and the fourth plane mirror is fixedly arranged on a bottom plate; the first parabolic reflector is arranged on the circular guide rail, and the second parabolic reflector is arranged on the bottom plate; when the relative heights of the first parabolic mirror, the second parabolic mirror and the first plane mirror and the second plane mirror are changed, the positions of the light spots on the first parabolic mirror and the second parabolic mirror are different so as to change the zenith angle of the light beam; the circular guide rail changes the azimuth angle of incident light, and the motor changes the azimuth angle of reflected light.
Further, the incident light zenith angle control unit further comprises a bracket; the focal point of the first parabolic reflector is positioned at the center of the surface of the sample, the first parabolic reflector is arranged on the bracket, the second plane reflector and the third plane reflector are 45 degrees with the horizontal plane and face each other, and the second plane reflector is positioned right above the third plane reflector; the first parabolic mirror, the second plane mirror and the third plane mirror are arranged on the circular guide rail at 180 degrees, and when the relative heights of the first parabolic mirror and the second plane mirror arranged on the second linear guide rail are changed, the positions of light spots on the first parabolic mirror are different, so that the zenith angle of incident light is changed.
Further, the focal point of the second parabolic mirror of the reflected light zenith angle control unit is located at the center of the surface of the sample, the fourth plane mirror and the fifth plane mirror are both 45 degrees with the horizontal plane and face each other, the centers of the first plane mirror and the fifth plane mirror are always located at the same height, the centers of the first plane mirror, the fourth plane mirror and the fifth plane mirror are located in the same plane, the first plane mirror and the second parabolic mirror are distributed in circular guide rails at two sides of the motor at 180 degrees, and the normal direction of the first plane mirror is changed according to the positions of the fourth plane mirror and the fifth plane mirror, so that a light beam from the second parabolic mirror irradiates on the fifth plane mirror after passing through the first plane mirror; when the relative heights of the second parabolic reflector and the first plane reflector and the fifth plane reflector which are arranged on the first linear guide rail and the third linear guide rail are changed, the reflected light of different positions on the second parabolic reflector is obtained, so that the zenith angle of the reflected light is changed.
Further, the bottom of the first parabolic mirror is higher than the top of the second parabolic mirror.
Further, the circular guide rail is fixedly arranged on the bottom plate.
Further, the motor is fixedly arranged on the bottom plate and positioned at the center of the circular guide rail, and the motor supports the sample to enable the sample to rotate around the axis.
Further, the first, second and third linear guide rails are all vertically installed.
Further, the moving range of the second plane reflector in the vertical direction covers the height of the first parabolic reflector, so that the incident light beam can reach any position of the first parabolic reflector.
Further, the moving range of the first plane reflector and the fifth plane reflector in the vertical direction covers the height of the second parabolic reflector, and reflected light beams at any positions of the second parabolic reflector are obtained.
Further, the width of the parabolic reflector is as narrow as possible, so that the space solid angle is reduced, and the space resolution and the measurement accuracy of BRDF measurement are improved;
further, the size of the first plane reflecting mirror is as small as possible, the space solid angle is reduced, and the space resolution and the measurement accuracy of BRDF measurement are improved.
The invention has the beneficial effects that:
the invention is suitable for the situation that the light source and the detector cannot move in space at will, simplifies the control method of zenith angle and azimuth angle of the light beam, avoids complex corner structure, can continuously control the direction of the light beam, has simple structure, and can effectively realize BRDF measurement through the parabolic reflector.
The incident light zenith angle and the reflected light zenith angle are controlled independently, the control of the incident light zenith angle and the reflected light zenith angle are combined with a motor and a circular guide rail to realize BRDF measurement of hemispherical space on the surface of a sample, and the control of each moving part is independent and independent of other degrees of freedom of movement, so that the control scheme of the incident light and the reflected light is simplified; the zenith angle of the light beam is changed through the relative height change of the parabolic mirror and the plane mirror, so that the movement range of the moving part is reduced, and the collision probability between the parts is reduced.
Drawings
FIG. 1 is an isometric view of the front of a BRDF measurement system based on a parabolic mirror of the present invention;
FIG. 2 is a rear isometric view of a BRDF measurement system according to the present invention, based on a parabolic mirror;
fig. 3 is a schematic structural diagram of a BRDF measurement system based on a parabolic mirror according to the present invention.
In the figure, a 1-first parabolic reflector, a 2-first linear guide, a 3-first planar reflector, a 4-second planar reflector, a 5-second linear guide, a 6-second parabolic reflector, a 7-third planar reflector, an 8-circular guide, a 9-bottom plate, a 10-motor, an 11-sample, a 12-fourth planar reflector, a 13-fifth planar reflector, a 14-third linear guide and a 15-bracket are shown.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, 2 and 3, the present embodiment provides a BRDF measurement system based on a parabolic mirror, which includes a first parabolic mirror 1, a first linear guide 2, a first planar mirror 3, a second planar mirror 4, a second linear guide 5, a second parabolic mirror 6, a third planar mirror 7, a circular guide 8, a bottom plate 9, a motor 10, a fourth planar mirror 12, a fifth planar mirror 13, a third linear guide 14 and a bracket 15. The incident light zenith angle control unit is composed of the first parabolic reflector 1, the second planar reflector 4, the third planar reflector 7, the second linear guide rail 5 and the bracket 15. The focus of the first parabolic reflector 1 is located at the center of the surface of the sample 11, the second parabolic reflector 4 is mounted on the second linear guide rail 5, the first parabolic reflector 1 is mounted on the support 15, the second parabolic reflector 4 and the third parabolic reflector 7 are 45 degrees with the horizontal plane and face each other, and the second parabolic reflector 4 is located right above the third parabolic reflector 7. The incident light zenith angle control unit is arranged on the circular guide rail 8, and the first parabolic reflector 1, the second plane reflector 4 and the third plane reflector 7 are arranged at 180 degrees. The horizontal light is irradiated on the mirror surface of the third plane mirror 7, reflected by the second plane mirror 4, irradiated on the mirror surface of the first parabolic mirror 1, and focused on the center of the sample 11. The second linear guide rail 5 drives the second plane reflecting mirror 4 to move in the vertical direction, and changes the position of the light spot on the first parabolic reflecting mirror 1 to change the included angle between the light beam and the normal line of the surface of the sample, namely, change the zenith angle of the incident light.
In this embodiment, the second parabolic mirror 6, the first planar mirror 3, the fourth planar mirror 12, the fifth planar mirror 13, the first linear guide rail 2, and the third linear guide rail 14 form a reflected light zenith angle control unit. The focal point of the second parabolic mirror 6 is located at the center of the surface of the sample 11, the first plane mirror 3 is installed on the first linear guide rail 2, the fifth plane mirror 13 is installed on the third linear guide rail 14, the fourth plane mirror 12 is fixedly installed on the bottom plate 9, the fourth plane mirror 12 and the fifth plane mirror 13 are both 45 degrees with the horizontal plane and face each other, the centers of the first plane mirror 3 and the fifth plane mirror 13 are always located at the same height, the centers of the first plane mirror 3, the fourth plane mirror 12 and the fifth plane mirror 13 are located in the same plane, the first plane mirror 3 and the second plane mirror 6 are distributed in the circular guide rails 8 on two sides of the motor 10 in a 180-degree mode, and the normal direction of the first plane mirror 3 can be changed according to the positions of the fourth plane mirror 12 and the fifth plane mirror 13, so that light beams from the second plane mirror 6 can irradiate on the fifth plane mirror 13 after passing through the first plane mirror 3. The reflected light on the surface of the sample 11 is reflected by the second parabolic mirror 6, and the light beams in a certain area on the second parabolic mirror 6, namely the light beams with different reflection zenith angles, can be selectively reflected by moving the height of the first plane mirror 3, and the light beams horizontally exit to the photosensitive surface of the detector after passing through the fifth plane mirror 13 and the fourth plane mirror 12.
In this embodiment, the circular guide rail 8 is fixedly mounted on the bottom plate 9, and the circular guide rail 8 drives the incident light zenith angle control unit to rotate around the center of the surface of the sample 11 together, so as to change the azimuth angle of the incident light beam.
In this embodiment, the motor 10 is fixedly mounted on the bottom plate 9 and is located at the center of the circular guide rail 8. The sample 11 is mounted on a tray of the motor 10, and the sample 11 rotates along with the rotating shaft of the motor 10 to change the azimuth angle of the reflected light. The motor 10 and the circular guide rail 8 form an azimuth control system of the light beam.
In this embodiment, the bottom of the first parabolic mirror 1 is higher than the top of the second parabolic mirror 6, so as to reduce the shielding of the light beam and expand the zenith angle range of the incident light.
In this embodiment, the moving range of the second plane mirror 4 in the vertical direction needs to cover the height of the first parabolic mirror 1, and the moving ranges of the first plane mirror 3 and the fifth plane mirror 13 in the vertical direction need to cover the height of the second parabolic mirror 6, so that the incident beam can reach any position of the first parabolic mirror 1, and the reflected beam at any position of the second parabolic mirror 6 can be obtained, thereby expanding the measuring range of BRDF.
In this embodiment, the widths of the first parabolic mirror 1 and the second parabolic mirror 6 are as narrow as possible, so as to obtain the reflected light in the smaller spatial solid angle, and improve the spatial resolution and the measurement accuracy of BRDF measurement.
In this embodiment, the size of the first plane mirror 3 should be as small as possible, so as to obtain the reflected light in a smaller spatial solid angle, thereby improving the spatial resolution and measurement accuracy of BRDF measurement.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (9)
1. BRDF measurement system based on parabolic reflector, its characterized in that: the azimuth angle control system of the light beam comprises a zenith angle control unit of the light beam formed by the plane reflecting mirror and the parabolic reflecting mirror, a motor and a circular guide rail, wherein the zenith angle control unit comprises an incident light zenith angle control unit and a reflected light zenith angle control unit; the incident light zenith angle control unit comprises a first parabolic mirror, a second plane mirror and a third plane mirror, the reflected light zenith angle control unit comprises a second parabolic mirror, a first plane mirror, a fourth plane mirror and a fifth plane mirror, the first plane mirror is arranged on a first linear guide rail, the fifth plane mirror is arranged on a third linear guide rail, the second plane mirror is arranged on a second linear guide rail, the third plane mirror is arranged on a circular guide rail, and the fourth plane mirror is fixedly arranged on a bottom plate; the first parabolic reflector is arranged on the circular guide rail, and the second parabolic reflector is arranged on the bottom plate; when the relative heights of the first parabolic mirror, the second parabolic mirror and the first plane mirror and the second plane mirror are changed, the positions of the light spots on the first parabolic mirror and the second parabolic mirror are different so as to change the zenith angle of the light beam; the circular guide rail changes the azimuth angle of incident light, and the motor changes the azimuth angle of reflected light.
2. A BRDF measurement system based on a parabolic mirror according to claim 1, wherein: the incident light zenith angle control unit further comprises a bracket; the focal point of the first parabolic reflector is positioned at the center of the surface of the sample, the first parabolic reflector is arranged on the bracket, the second plane reflector and the third plane reflector are 45 degrees with the horizontal plane and face each other, and the second plane reflector is positioned right above the third plane reflector; the first parabolic mirror, the second plane mirror and the third plane mirror are arranged on the circular guide rail at 180 degrees, and when the relative heights of the first parabolic mirror and the second plane mirror arranged on the second linear guide rail are changed, the positions of light spots on the first parabolic mirror are different, so that the zenith angle of incident light is changed.
3. A BRDF measurement system based on a parabolic mirror according to claim 1, wherein: the focal point of the second parabolic mirror of the reflected light zenith angle control unit is positioned at the center of the surface of the sample, the fourth plane mirror and the fifth plane mirror are 45 degrees with the horizontal plane and face each other, the centers of the first plane mirror and the fifth plane mirror are always positioned at the same height, the centers of the first plane mirror, the fourth plane mirror and the fifth plane mirror are positioned in the same plane, the first plane mirror and the second parabolic mirror are distributed in circular guide rails at two sides of the motor at 180 degrees, and the normal direction of the first plane mirror is changed according to the positions of the fourth plane mirror and the fifth plane mirror, so that light beams from the second parabolic mirror irradiate on the fifth plane mirror after passing through the first plane mirror; when the relative heights of the second parabolic reflector and the first plane reflector and the fifth plane reflector which are arranged on the first linear guide rail and the third linear guide rail are changed, the reflected light of different positions on the second parabolic reflector is obtained, so that the zenith angle of the reflected light is changed.
4. A BRDF measurement system based on a parabolic mirror according to claim 1, wherein: the bottom of the first parabolic mirror is higher than the top of the second parabolic mirror.
5. A BRDF measurement system based on a parabolic mirror according to claim 1, wherein: the circular guide rail is fixedly arranged on the bottom plate.
6. A BRDF measurement system based on a parabolic mirror according to claim 1, wherein: the motor is fixedly arranged on the bottom plate and positioned at the center of the circular guide rail, and the motor supports the sample to enable the sample to rotate around the axis.
7. A BRDF measurement system based on a parabolic mirror according to claim 1, wherein: the first, second and third linear guide rails are all vertically installed.
8. A BRDF measurement system based on a parabolic mirror according to claim 2, wherein: the moving range of the second plane reflector in the vertical direction covers the height of the first parabolic reflector, so that an incident light beam can reach any position of the first parabolic reflector.
9. A BRDF measurement system based on a parabolic mirror according to claim 3, wherein: and the moving range of the first plane reflector and the fifth plane reflector in the vertical direction covers the height of the second parabolic reflector, and reflected light beams at any position of the second parabolic reflector are obtained.
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| CN202310350790.5A CN116136496B (en) | 2023-04-04 | 2023-04-04 | BRDF measurement system based on parabolic reflector |
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| CN202310350790.5A CN116136496B (en) | 2023-04-04 | 2023-04-04 | BRDF measurement system based on parabolic reflector |
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