CN108489937A - A kind of solid material bidirectional reflectance distribution function measuring device - Google Patents

A kind of solid material bidirectional reflectance distribution function measuring device Download PDF

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Publication number
CN108489937A
CN108489937A CN201810275164.3A CN201810275164A CN108489937A CN 108489937 A CN108489937 A CN 108489937A CN 201810275164 A CN201810275164 A CN 201810275164A CN 108489937 A CN108489937 A CN 108489937A
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CN
China
Prior art keywords
optical fiber
distribution function
sample
solid
bidirectional reflectance
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Application number
CN201810275164.3A
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Chinese (zh)
Inventor
帅永
田思哲
郭延铭
谈和平
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哈尔滨工业大学
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Application filed by 哈尔滨工业大学 filed Critical 哈尔滨工业大学
Priority to CN201810275164.3A priority Critical patent/CN108489937A/en
Publication of CN108489937A publication Critical patent/CN108489937A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47Scattering, i.e. diffuse reflection
    • G01N21/4738Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47Scattering, i.e. diffuse reflection
    • G01N21/4738Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474Details of optical heads therefor, e.g. using optical fibres
    • G01N2021/4742Details of optical heads therefor, e.g. using optical fibres comprising optical fibres

Abstract

The present invention proposes a kind of solid material bidirectional reflectance distribution function measuring device, belongs to material Radiation biodosimetry technical field.Described device includes specimen holder, measured hole, optical fiber matching casing, bifurcated reflectance detection optical fiber beam, laser control platform, light power meter, optical fiber, holding screw, spherical case, lifting bolt and computer.The solid material bidirectional reflectance distribution function measuring device has the characteristics that simple in structure, easy to operate.

Description

A kind of solid material bidirectional reflectance distribution function measuring device
Technical field
The present invention relates to a kind of solid material bidirectional reflectance distribution function measuring devices, belong to material Radiation biodosimetry skill Art field.
Background technology
Bidirectional reflectance distribution function (BRDF) was proposed in 1970 by American scholar Nicodemus earliest, to describe The space reflection distribution character of various different surfaces, mainly by the roughness of material surface, the dielectric constant of material, incident light The factors such as the polarization characteristic of wavelength and incident light codetermine.Bidirectional reflectance distribution function is widely used in aerospace, distant Feel the numerous areas such as detection, Computer Image Processing, natural calamity and climatic study, in addition to this, bidirectional reflectance distribution function Measurement result can be used for obtaining the emissivity and absorptivity of some target materials.In Laser Active Detection, road traffic The fields such as safety are with greater need for the reflection characteristic-rear reflection characteristic reverse with incident light.Currently, common BRDF measuring devices All it is conceived to the volume reflection in other directions different from incident light direction, shorter mention retroreflection.It is rare it is several be directed to after All have the shortcomings that light path is complicated, it is difficult to adjust to the measuring device of reflection, is difficult to realize to the fast of the BRDF containing retroreflection Speed, easy measurement.
Invention content
The present invention is slow for the measuring device measurement corresponding speed for solving the currently BRDF containing retroreflection, complicated Problem provides a kind of measuring device of quick, the omnidirectional sample bidirectional reflectance distribution function of simplicity, the technical side taken Case is as follows:
A kind of solid material bidirectional reflectance distribution function measuring device, described device include specimen holder 1, measured hole 3, optical fiber Match casing 4, bifurcated reflectance detection optical fiber beam 5, laser control platform 6, light power meter 7, optical fiber 8, holding screw 9, enclosed globe shade Shell 10, lifting bolt 11 and computer 12;
The specimen holder 1 is installed on by lifting bolt 11 inside the spherical case 10;The specimen holder 1 is equipped with a left side Right symmetrical two holding screws 9;The measured hole 3 is uniformly distributed on the spherical case 10;The spherical shape case 10 Optical fiber matches casing 4 there are two being set on shell;One optical fiber matching casing 4 passes through bifurcated reflectance detection optical fiber beam 5 and institute It states laser control platform and light power meter 7 carries out signal transmission;Another described optical fiber matching casing 4 passes through optical fiber 8 and light work( Rate meter 7 carries out signal transmission;The signal output end of the light power meter 7 is connected with the signal input part of the computer 12.
Further, the sample of described device detection is set to the center of 1 upper surface of the specimen holder by holding screw 9 Position;The height and levelness of the specimen holder 1 make 2 upper surface of sample and spherical case 10 by the adjusting of the lifting bolt 11 Hemisphere bottom surface it is coplanar.
Further, 2 thickness of the print<30mm, diameter range 45mm-90mm.
Further, the measuring process of the solid material bidirectional reflectance distribution function measuring device is as follows:
Step 1: before measuring progress, connects light path and simultaneously optical fiber is fixed;Start laser control platform 6, setting Transmission power and temperature open the control of laser control platform temperature, temperature are controlled at 25 DEG C;
Step 2: on installation standard white plate to specimen holder, the standard white plate position is fixed using holding screw, and adjusts Whole specimen holder height and levelness keep standard white plate upper surface and the hemisphere bottom surface of spherical case coplanar;
Step 3: the position of branch detection optical fiber beam 5 or optical fiber 8 on spherical case 10 is changed with optical fiber matching casing 4, The reflection power of all directions of measurement standard blank is simultaneously denoted as PBlank
Step 4: standard white plate is changed to sample to be tested, repeat Step 2: Step 3: step 4, data measured are denoted as PSample
Step 5: the data P then obtained respectively according to step 3 and step 4BlankAnd pSample, by measuring blank power Value and the comparison of sample power calculate and measure the value of solid material bidirectional reflectance distribution function indirectly;
Further, in the model of the indirect survey calculation method of solid material bidirectional reflectance distribution function described in step 5, It using standard white plate as the standard of referring to, and is reflected and is regarded as more satisfactory diffuser, all directions bidirectional reflectance is distributed letter Numerical value isThe performance number reflected with equidirectional sample is compared with the performance number that blank reflects, you can The bidirectional reflectance distribution function value in the direction of sample is measured, specific computation model is as follows:
Wherein:F --- the value of solid material bidirectional reflectance distribution function;
PSample--- the reflected optical power of the sample measured;
PBlank--- the reflected optical power of the blank measured;
θi--- the zenith angle of incident ray;
--- the deflection of incident ray;
θr--- the zenith angle of reflection light;
--- the deflection of reflection light;
λ --- lambda1-wavelength;
The reflectivity of ρ --- standard white plate.
Further, 5 ° of zenith angular separation are pressed on the spherical case 9,60 ° of direction angular separation are evenly distributed with 103 circles The measured hole 3 of shape, the measured hole 3 match casing 4 by optical fiber respectively and are connected with bifurcated reflectance detection optical fiber beam 5 or optical fiber 8 It connects, realization measures 103 directions in hemispherical space.
Further, the bifurcated reflectance detection optical fiber beam 5 is made of seven optical fiber;Wherein, in seven optical fiber A piece optical fiber is incident optical, and the light that the incident optical coupling is emitted from laser control platform 6 is simultaneously emitted on sample;Separately Outer six roots of sensation optical fiber is one group, is centered around around incident optical, receives reflected light and be transferred to light power meter 7.
Further, the bifurcated reflectance detection optical fiber beam 5 is used to provide the component of incident light and the light to retroreflection Carry out approximate measure;The optical fiber 8 is used to receive the reflected light in other direction other than backward.
Advantageous effect of the present invention:
Device of the present invention utilizes enclosed globe shade hull shape at a dark room conditions, and provides measured hole for carry optical fiber. The light that laser is launched is irradiated to sample surfaces via spread fiber and reflects, and reflected light is connect by optical fiber or reflection probe It receives, propagate to light power meter progress reflection power measurement.The direction reflection power distribution of sample is reflected with standard white plate direction Power distribution is compared to obtain BRDF values.
Solid material bidirectional reflectance distribution function measuring device proposed by the present invention is simple in structure, easy to operate, does not need Complicated adjusting is carried out to light path, easy can rapidly measure the reflection distribution of the sample surfaces including retroreflection Characteristic.The reflection characteristic distribution that the present invention can quickly and efficiently treat survey sample surface measures, while having higher Scalability, can be at one compared with wide spectrum model by adjustment to reflection probe, optical fiber, laser and light power meter and matching It is measured in enclosing, meanwhile, the uncertainty of measurement is reduced to 6% or so.
Description of the drawings
Fig. 1 is the structural schematic diagram of measuring device of the present invention.
When Fig. 2 is diffusion 30 ° of incidence of blank, the measurement result figure of the power distribution of other measured all directions.
Fig. 3 is the measurement result figure for the power distribution for diffusing blank all directions retroreflection.
Specific implementation mode
With reference to specific embodiment, the present invention will be further described, but the present invention should not be limited by the examples.
Embodiment 1:
It is illustrated with reference to Fig. 1 the present embodiment, the present embodiment proposes a kind of solid material bidirectional reflectance distribution function measuring device, It include specimen holder 1, sample 2, measured hole 3, optical fiber matching casing 4, bifurcated reflectance detection optical fiber beam 5, laser control platform 6, Light power meter 7, optical fiber 8, holding screw 9, spherical case 10, lifting bolt 11, computer 12.The specimen holder 1 is by lifting spiral shell Bolt 11 is installed on inside the spherical case 10;The specimen holder 1 is equipped with symmetrical two holding screws 9;The survey Metering-orifice 3 be uniformly distributed on the spherical case 10;Optical fiber matches casing there are two being set on the shell of the spherical shape case 10 4;One optical fiber matching casing 4 passes through bifurcated reflectance detection optical fiber beam 5 and the laser control platform 6 and light power meter 7 Carry out signal transmission;Another described optical fiber matching casing 4 carries out signal transmission by optical fiber 8 and light power meter 7;The smooth work( The signal output end of rate meter 7 is connected with the signal input part of the computer 12.
Sample 2 is placed on specimen holder 1, and 1 center of specimen holder is fixed on by holding screw 9.Lifting bolt 11 can be adjusted The height and levelness of specimen holder 1, to keep 2 upper surface of sample and the hemisphere bottom surface of spherical case 10 coplanar.Wherein, the sample 2 thickness of piece<30mm, diameter range 45mm-90mm.
Bifurcated reflectance detection optical fiber beam 5 and optical fiber 8 match casing 4 by optical fiber, pass through survey uniformly distributed on spherical case 10 Metering-orifice 3 is positioned.
The laser of certain specific wavelength is generated from laser control platform 6, and ball is transferred to by bifurcated reflectance detection optical fiber beam 5 Face is propagated in air after outgoing, and after the reflection of 2 upper surface of sample, the reflection light in certain direction is received by optical fiber 8, and It is transmitted to the measurement of light power meter 7.
For being parallel to the retroreflection component of incident ray, it is branched out instead by the back reflected laser of 2 upper surface of sample The reception of detection optical fiber beam 5 is penetrated, and is transmitted to the measurement of light power meter 7.
5 ° of zenith angular separation are pressed on the spherical shape case 9,60 ° of direction angular separation are evenly distributed with 103 circular measurements Hole 3, the measured hole 3 match casing 4 by optical fiber respectively and are connected with bifurcated reflectance detection optical fiber beam 5 or optical fiber 8, realization pair 103 directions measure in hemispherical space.The bifurcated reflectance detection optical fiber beam 5 is made of seven optical fiber;Wherein, described seven An optical fiber in root optical fiber is incident optical, the light that the incident optical coupling is emitted from laser control platform 6 and transmitting Onto sample;In addition six roots of sensation optical fiber is one group, is centered around around incident optical, receives reflected light and be transferred to light power meter 7.Institute Bifurcated reflectance detection optical fiber beam 5 is stated for providing incident light and carrying out approximate measure to the component of the light of retroreflection;The light Reflected light of the fibre 8 for receiving a direction other than backward.
The operation principle of each building block in measuring device described in the present embodiment and effect:
The effect of the specimen holder 1 is that the plane of a placement is provided for sample to be tested, while can be according to waiting for test sample The size and thickness of product are adjusted with fixed to improve the precision of measurement.
The sample 2 is the solid material of bidirectional reflectance distribution function to be measured.
The measured hole 3 is the equally distributed eyelet on spherical case 10, and effect is to match casing 4 by optical fiber It is connected with bifurcated reflectance detection optical fiber beam 5 or optical fiber 8, is positioned.
Bifurcated reflectance detection optical fiber beam 5 or optical fiber 8 are fixed on measured hole by the effect of the optical fiber matching casing 4, It is convenient for measuring.
The principle of the bifurcated reflectance detection optical fiber beam 5 is the total reflection of light, and effect is by Laser emission to sample Surface and the laser components for receiving retroreflection are transferred to light power meter and measure.
Laser built in the laser control platform 6, and provide and the current control and temperature of laser are controlled.Laser The principle of device is Fabry-Perot cavity, and effect is to generate the laser of specific wavelength.
The principle of the light power meter 7 is photoelectric effect, and effect is to measure the watt level of reflected light.
The principle of the optical fiber 8 is the total reflection of light, and effect is to receive the reflected light of sample, is transferred to light power meter It measures.
The effect of the holding screw 9 is fixed sample to be tested.
The effect of the spherical case 10 is to generate a hemisphere darkroom, and 3 carry bifurcated reflectance of distribution measuring hole is visited It surveys fiber optic bundle 5 or optical fiber 8 is positioned and measured.
The effect of the lifting bolt 11 is to adjust the height and levelness of specimen holder 1, makes sample surface to be measured and ball 10 hemisphere bottom surface of shape case is coplanar
The effect of the computer 12 is control light power meter 7 and carries out data processing, and realize semi-automation operation.
The solid material bidirectional reflectance distribution function measuring device that the present embodiment proposes is simple in structure, easy to operate, is not required to Complicated adjusting is carried out to light path, easy can rapidly measure the reflection point of the sample surfaces including retroreflection Cloth characteristic.The reflection characteristic distribution that the present invention can quickly and efficiently treat survey sample surface measures, while having higher Scalability, can be at one compared with wide spectrum by adjustment to reflection probe, optical fiber, laser and light power meter and matching It is measured in range, meanwhile, the uncertainty of measurement is reduced to 6% or so.
Embodiment 2
The present embodiment proposes a kind of solid material bidirectional reflectance distribution function measuring device, the solid material bidirectional reflectance The measuring process of distribution function measuring device is as follows:
Step 1: before measuring progress, connects light path and simultaneously optical fiber is fixed;Start laser control platform 6, setting Transmission power and temperature open the control of laser control platform temperature, temperature are controlled at 25 DEG C;
Step 2: on installation standard white plate to specimen holder, the standard white plate position is fixed using holding screw, and adjusts Whole specimen holder height and levelness keep standard white plate upper surface and the hemisphere bottom surface of spherical case coplanar;
Step 3: the position of branch detection optical fiber beam 5 or optical fiber 8 on spherical case 10 is changed with optical fiber matching casing 4, The reflection power of all directions of measurement standard blank is simultaneously denoted as PBlank
Step 4: standard white plate is changed to sample to be tested, repeat Step 2: Step 3: step 4, data measured are denoted as PSample
Step 5: the data P then obtained respectively according to step 3 and step 4BlankAnd PSample, by measuring blank power Value and the comparison of sample power calculate and measure the value of solid material bidirectional reflectance distribution function indirectly
Wherein, in the model of the indirect survey calculation method of solid material bidirectional reflectance distribution function described in step 5, with mark Quasi- blank is used as the standard of referring to, and is reflected and be regarded as more satisfactory diffuser, all directions bidirectional reflectance distribution function value It isThe performance number reflected with equidirectional sample is compared with the performance number that blank reflects, you can is measured The bidirectional reflectance distribution function value in the direction of sample, specific computation model are as follows:
Wherein:F --- the value of solid material bidirectional reflectance distribution function;
PSample--- the reflected optical power of the sample measured;
PBlank--- the reflected optical power of the blank measured;
θi--- the zenith angle of incident ray;
--- the deflection of incident ray;
θr--- the zenith angle of reflection light;
--- the deflection of reflection light;
λ --- lambda1-wavelength;
The reflectivity of ρ --- standard white plate.
Although the present invention is disclosed as above with preferred embodiment, it is not limited to the present invention, any to be familiar with this The people of technology can do various changes and modification, therefore the protection of the present invention without departing from the spirit and scope of the present invention Range should be subject to what claims were defined.

Claims (8)

1. a kind of solid material bidirectional reflectance distribution function measuring device, which is characterized in that described device include specimen holder (1), Measured hole (3), optical fiber matching casing (4), bifurcated reflectance detection optical fiber beam (5), laser control platform (6), light power meter (7), Optical fiber (8), holding screw (9), spherical case (10), lifting bolt (11) and computer (12);
The specimen holder (1) is installed on spherical case (10) inside by lifting bolt (11);It is set on the specimen holder (1) There are symmetrical two holding screws (9);The measured hole (3) is uniformly distributed on the spherical case (10);The ball Optical fiber matching casing (4) there are two being set on the shell of shape case (10);One optical fiber matching casing (4) passes through bifurcated reflectance Detection optical fiber beam (5) carries out signal transmission with the laser control platform (6) and light power meter (7);Another described optical fiber Signal transmission is carried out by optical fiber (8) and light power meter (7) with casing (4);The signal output end of the light power meter (7) and institute The signal input part for stating computer (12) is connected.
2. solid material bidirectional reflectance distribution function measuring device according to claim 1, which is characterized in that described device is examined The sample of survey is set to the center of the specimen holder (1) upper surface by holding screw (9);The height of the specimen holder (1) Degree and levelness are adjusted by the lifting bolt (11) keeps sample (2) upper surface and the hemisphere bottom surface of spherical case (10) total Face.
3. solid material bidirectional reflectance distribution function measuring device according to claim 2, which is characterized in that the print (2) thickness<30mm, diameter range 45mm-90mm.
4. solid material bidirectional reflectance distribution function measuring device according to claim 1, which is characterized in that the solid material Expect that the measuring process of bidirectional reflectance distribution function measuring device is as follows:
Step 1: before measuring progress, connects light path and simultaneously optical fiber is fixed;Start laser control platform (6), setting hair Power and temperature are penetrated, the control of laser control platform temperature is opened, temperature is controlled at 25 DEG C;
Step 2: on installation standard white plate to specimen holder, the standard white plate position is fixed using holding screw, and adjust sample Product seat height degree and levelness keep standard white plate upper surface and the hemisphere bottom surface of spherical case coplanar;
Step 3: changing branch detection optical fiber beam (5) or optical fiber (8) on spherical case (10) with optical fiber matching casing (4) Position, the reflection power of all directions of measurement standard blank are simultaneously denoted as PBlank
Step 4: standard white plate is changed to sample to be tested, repeat Step 2: Step 3: step 4, data measured are denoted as PSample
Step 5: the data P then obtained respectively according to step 3 and step 4BlankAnd PSample, by the value for measuring blank power Comparison with sample power calculates the value for measuring solid material bidirectional reflectance distribution function indirectly.
5. the solid material bidirectional reflectance distribution function measuring device stated according to claim 4, which is characterized in that described in step 5 In the model of the indirect survey calculation method of solid material bidirectional reflectance distribution function, using standard white plate as the standard of referring to, and will Its reflection is regarded as more satisfactory diffuser, and all directions bidirectional reflectance distribution function value isIt is anti-with equidirectional sample The performance number penetrated is compared with the performance number that blank reflects, you can measures the bidirectional reflectance in the direction of sample Distribution function value, specific computation model are as follows:
Wherein:F --- the value of solid material bidirectional reflectance distribution function;
PSample--- the reflected optical power of the sample measured;
PBlank--- the reflected optical power of the blank measured;
θi--- the zenith angle of incident ray;
--- the deflection of incident ray;
θr--- the zenith angle of reflection light;
--- the deflection of reflection light;
λ --- lambda1-wavelength;
The reflectivity of ρ --- standard white plate.
6. solid material bidirectional reflectance distribution function measuring device according to claim 1, which is characterized in that the spherical shape 5 ° of zenith angular separation are pressed on case (9), 60 ° of direction angular separation are evenly distributed with 103 circular measured holes (3), the measurement Hole (3) matches casing (4) by optical fiber respectively and is connected with bifurcated reflectance detection optical fiber beam (5) or optical fiber (8), realizes to hemisphere 103 directions measure in space.
7. solid material bidirectional reflectance distribution function measuring device according to claim 1, which is characterized in that the branch Reflection detection optical fiber beam (5) is made of seven optical fiber;Wherein, an optical fiber in seven optical fiber is incident optical, described Incident optical coupling is from the middle light being emitted of laser control platform (6) and is emitted on sample;In addition six roots of sensation optical fiber is one group, is surrounded Around incident optical, receives reflected light and be transferred to light power meter (7).
8. solid material bidirectional reflectance distribution function measuring device according to claim 1, which is characterized in that the branch Reflection detection optical fiber beam (5) is for providing incident light and carrying out approximate measure to the component of the light of retroreflection;The optical fiber (8) Reflected light for receiving other direction other than backward.
CN201810275164.3A 2018-03-30 2018-03-30 A kind of solid material bidirectional reflectance distribution function measuring device CN108489937A (en)

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Cited By (1)

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