CN103196871A - Measurement turntable for bidirectional reflection distribution function of sample - Google Patents
Measurement turntable for bidirectional reflection distribution function of sample Download PDFInfo
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Abstract
The invention provides a measurement turntable for a bidirectional reflection distribution function (BRDF) of a sample, which belongs to the technical field of measuring of BRDFs. With measurement turntable provided by the invention, the problems of a great volume and high cost of a conventional BRDF measurement turntable are overcome. The measurement turntable comprises a laser, a detector, a field lens, a first plane mirror, a second plane mirror, a light source support, a horizontal rotary table, a detector mounting rack, a field lens mounting rack, a connecting rod, a sample, a sample holder, a pedestal, a first rotating shaft, two end plates and a second rotating shaft, wherein parallel light beams transmitted by the laser are incident to the second plane mirror after reflection by the first plane mirror, reflected light beams of the second plane mirror are incident to the upper surface of the sample, reflected light beams of the sample are incident to a light receiving surface of the detector after convergence by the field lens, and the detector is located at the focus of the field lens. The measurement turntable provided by the invention is applicable to measurement of the BRDF of the sample.
Description
Technical field
The present invention relates to sample bidirectional reflectance distribution function and measure turntable, belong to bidirectional reflectance distribution function field of measuring technique.
Background technology
Existing bidirectional reflectance distribution function BRDF measures turntable following two types:
First kind is:
BRDF measures sample transfixion on the turntable, light source and detector motion, and the measurement that can cover sample hemisphere space, there is following shortcoming in it:
(1) light source need be directly installed on the telecontrol equipment, and the light source of changing different wave length is difficult, needs the bigger motor of output torque to drive;
(2) device volume is generally very big, and higher to the requirement on machining accuracy of physical construction, cost significantly increases, and the device overall weight is big, is difficult for carrying.
Second kind is:
Light source keeps static on the BRDF measurement turntable, and sample and detector move respectively.The shortcoming that it exists is as follows:
(1) sample essential can luffing could the motion of equivalent substitute light source on the zenith angle direction, thus, the necessary secure fixation of sample is on specimen mount, because the existence of clamping force, may make tested sample internal stress occur, anisotropic situation appears in feasible material as script isotropics such as glass, influences measurement result;
(2) its size of the sample of different materials may be similar, is difficult for the general stationary installation of design, can introduce bigger angular error if fixing unreliable situation occurs;
(3) can only test solid sample.
Summary of the invention
The present invention is big in order to solve existing BRDF measurement turntable volume, and the problem that cost is high provides a kind of sample bidirectional reflectance distribution function to measure turntable.
Sample bidirectional reflectance distribution function of the present invention is measured turntable, it comprises laser instrument, it also comprises detector, field lens, first plane mirror, second plane mirror, light source bracket, horizontal revolving stage, detector erecting frame, field lens erecting frame, connecting rod, sample, sample holder, base, first rotating shaft, two end plates and second rotating shaft
Detector erecting frame and field lens erecting frame are arranged on the upper end of connecting rod from top to bottom, and connecting rod is connected with first rotating shaft is vertical by shaft coupling, and first rotating shaft is arranged between two end plates, and the bottom of two end plates is fixed on the horizontal revolving stage; Detector is fixedly arranged on the detector erecting frame, field lens is fixedly arranged on the field lens erecting frame;
First plane mirror and second plane mirror are separately positioned on the light source bracket, the bottom of light source bracket is fixed on the base, base is passed in second rotating shaft, the bottom of second rotating shaft connects the center of horizontal revolving stage, the top of second rotating shaft connects the center of sample holder, the sample of placing placed in the middle on the sample holder;
The parallel beam of laser instrument emission is incident to second plane mirror after the first plane reflection mirror reflection, the folded light beam of second plane mirror is incident to the upper surface of sample, be incident to the light receiving surface of detector after the folded light beam of sample converges by field lens, detector is positioned at the focal length place of field lens.
It also comprises first three-phase stepper motor,
The output shaft of first three-phase stepper motor links to each other with first rotating shaft by the thin slice shaft coupling, and first three-phase stepper motor is used for driving first rotating shaft rotation, thereby detector is moved in the zenith angle direction.
It also comprises follower gear, driving gear and two-phase stepping motor, and the diameter of follower gear is greater than the diameter of driving gear;
Follower gear is socketed in the outer round surface of horizontal revolving stage, follower gear matches with driving gear, driving gear is socketed on the output shaft of two-phase stepping motor, two-phase stepping motor is used for driving the driving gear rotation, rotate in the horizontal direction thereby drive horizontal revolving stage, realize the azimuthal change of detector.
It also comprises second three-phase stepper motor,
The output shaft of second three-phase stepper motor is connected with second rotating shaft, and second three-phase stepper motor drives second rotating shaft rotation, thereby the parallel beam of laser instrument emission is moved at azimuth direction.
The parallel beam of laser instrument emission is identical with the level height of first plane mirror;
It is circular-arc that light source bracket is, the center of circle of this light source bracket overlaps with the center of sample, by changing the angle between first plane mirror and its incident parallel beam, and then change the position of second plane mirror on light source bracket, thereby realize that the parallel beam of laser instrument emission is in the motion of zenith angle direction.
The zenith angle of the parallel beam of laser instrument emission is 0 °, 5 °, 10 °, 15 °, 30 °, 45 °, 60 ° and 75 °.
The position angle of the parallel beam of laser instrument emission is by the control of second three-phase stepper motor, and half step action step value is 0.6 °,
The zenith angle of detector is by the control of first three-phase stepper motor, and half step action step value is 0.6 °; The position angle of detector is controlled by two-phase stepping motor, and half step action step value is 0.6 °.
The focal length of field lens is 60mm.
The ratio of gear of driving gear and follower gear is 1: 4.5.
Advantage of the present invention: measurement turntable of the present invention is in test process, and sample can remain level, therefore can be used for the measurement of solid-state or liquid sample.It makes light source, and also the process mirror reflects is to the sample to be tested surface with directional light incident, and scattered light is that lens converge by field lens again before receiving.The light source zenith angle can change at 0 °, 5 °, 10 °, 15 °, 30 °, 45 °, 60 ° and 75 ° of representative values; The light source azimuth angle can be 0-360 ° of variation, and precision is 3 °; The detector zenith angle is near 0-90 ° of variation, and precision is 3 °, and the position angle is near 0-360 ° of variation, and precision is 3 °.
Measurement turntable physical construction of the present invention is simple, be of moderate size, price is relatively low, can guarantee that in measuring process sample is in horizontality, the horizontal laser light of light source for sending by laser instrument can reach the effect that changes optical source wavelength by changing various lasers.Incident light is directional light, can guarantee that the incident angle of sample diverse location equates.
Description of drawings
Fig. 1 is the structural representation that sample bidirectional reflectance distribution function of the present invention is measured turntable;
Fig. 2 is the structural representation of embodiment two;
Fig. 3 is the structural representation of embodiment three;
Fig. 4 is the structural representation of embodiment four;
Fig. 5 is the schematic diagram that two plane mirrors change the light source zenith angle, and described light source is the light beam of laser instrument emission;
Fig. 6 is the acquisition methods derivation principle figure that two plane mirrors are placed angle;
Fig. 7 is the realization synoptic diagram of light source zenith angle motion;
Fig. 8 is the driving interface circuit figure of single-chip microcomputer and first three-phase stepper motor, second three-phase stepper motor and two-phase stepping motor;
Fig. 9 is the driving circuit schematic diagram of two-phase stepping motor;
Figure 10 is two-phase stepping motor control signal sequential chart;
Figure 11 is the driving circuit schematic diagram of two three-phase stepper motors;
Figure 12 is the control signal sequential chart of two three-phase stepper motors.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, the described sample bidirectional reflectance of present embodiment distribution function is measured turntable, it comprises laser instrument 1, it also comprises detector 2, field lens 3, first plane mirror 4, second plane mirror 5, light source bracket 6, horizontal revolving stage 7, detector erecting frame 8, field lens erecting frame 9, connecting rod 10, sample 11, sample holder 12, base 13, first rotating shaft 14, two end plates 15 and second rotating shaft 16
The parallel beam of laser instrument 1 emission is incident to second plane mirror 5 after 4 reflections of first plane mirror, the folded light beam of second plane mirror 5 is incident to the upper surface of sample 11, be incident to the light receiving surface of detector 2 after the folded light beam of sample 11 converges by field lens 3, detector 2 is positioned at the focal length place of field lens 3.
Embodiment two: below in conjunction with Fig. 2 present embodiment is described, present embodiment is for to the further specifying of embodiment one, and present embodiment also comprises first three-phase stepper motor 17,
The output shaft of first three-phase stepper motor 17 links to each other with first rotating shaft 14 by the thin slice shaft coupling, and first three-phase stepper motor 17 is used for driving first rotating shaft, 14 rotations, thereby detector 2 is moved in the zenith angle direction.
For realizing the motion of detector 2 on the zenith angle direction, detector 2 is fixed in the detector erecting frame 8, detector erecting frame 8 is placed on the connecting rod 10 jointly with field lens erecting frame 9, connecting rod 10 links to each other with first rotating shaft 14 by the detector shaft coupling, and first three-phase stepper motor 17 also links to each other with first rotating shaft 14 by the thin slice shaft coupling.Just can drive first rotating shaft, 14 rotations by controlling 17 rotations of first three-phase stepper motor, thereby detector 2 is moved in the zenith angle direction, as shown in Figure 2.
First three-phase stepper motor, 17 synchronizing elongation are 1.2 °, adopt the control of half step when specifically controlling, and detector zenith angle minimum resolution is 0.6 ° like this.
Embodiment three: present embodiment is described below in conjunction with Fig. 3, present embodiment is further specifying embodiment one or two, present embodiment also comprises follower gear 18, driving gear 19 and two-phase stepping motor 20, and the diameter of follower gear 18 is greater than the diameter of driving gear 19;
The package unit of detector 2 zenith angles motion is placed on the horizontal revolving stage 7, because moment of inertia is bigger, so use gear-driven mode, at horizontal revolving stage 7 outer ring socket follower gears 18, follower gear 18 cooperates with driving gear 19 on being enclosed within two-phase stepping motor 20, when two-phase stepping motor 20 rotates, by gear drive horizontal revolving stage 7 is rotated in the horizontal direction, thereby realize detector 2 azimuthal changes.Horizontal revolving stage 7 can be placed on the turret base by thrust bearing, and the support of two-phase stepping motor 20 also can be connected on the turret base, by screw as shown in Figure 3.
Embodiment four: below in conjunction with Fig. 4 present embodiment is described, present embodiment is for to embodiment one, two or three further specify, and present embodiment also comprises second three-phase stepper motor 21,
The output shaft of second three-phase stepper motor 21 is connected with second rotating shaft 16, and second three-phase stepper motor 21 drives second rotating shaft, 16 rotations, thereby the parallel beam of laser instrument 1 emission is moved at azimuth direction.
In the present embodiment, laser instrument 1 sends horizontal laser light, makes laser never be incident to the upper surface of tested sample 11 with zenith angle by two plane mirrors.The position angle of light source drives sample 11 rotations by second three-phase stepper motor 21 and changes; The zenith angle of detector 2 is rotated by first three-phase stepper motor, 17 drivening rods 10 and is changed, and the position angle of detector 2 drives 8 rotations of detector erecting frame by two-phase stepping motor 20 and changes.Reflected light behind the final process sample 11 passes through a field lens before arriving detector 2, be that plano-convex lens converges, detector 2 places this field lens 3 focal position, and the distance between detector 2 and the field lens 3 is manual adjustments as required, and field lens 3 also can be changed as required.By rational control, in the time of can realizing being reference frame with the sample, light source and detector all cover the hemisphere space of sample, and its measuring position can be satisfied the needs of general measure fully.
Embodiment five: present embodiment is for to embodiment one, two, three or four further specify, and the parallel beam of described laser instrument 1 emission of present embodiment is identical with the level height of first plane mirror 4;
Embodiment six: present embodiment is for to embodiment one, two, three, four or five further specify, and the zenith angle of the parallel beam of described laser instrument 1 emission of present embodiment is 0 °, 5 °, 10 °, 15 °, 30 °, 45 °, 60 ° and 75 °.
Above-mentioned different angles need the position of manual second plane mirror 5 to realize.
Embodiment seven: present embodiment is for to embodiment four, five or six further specify, and the position angle of the parallel beam of described laser instrument 1 emission of present embodiment is by 21 controls of second three-phase stepper motor, and half step action step value is 0.6 °,
The zenith angle of detector 2 is by 17 controls of first three-phase stepper motor, and half step action step value is 0.6 °; The position angle of detector 2 is by two-phase stepping motor 20 controls, and half step action step value is 0.6 °.
In the present embodiment, the position angle of the parallel beam of laser instrument 1 emission, zenith angle and azimuthal working control step value of detector 2 are 3 °.
Embodiment eight: present embodiment is for to embodiment one, two, three, four, five, six or seven further specify, and the focal length of the described field lens 3 of present embodiment is 60mm.
Embodiment nine: below in conjunction with Fig. 1 to Figure 12 present embodiment is described, present embodiment is for to embodiment three, four, five, six, seven or eight further specify, and the ratio of gear of the described driving gear 19 of present embodiment and follower gear 18 is 1: 4.5.
Measurement turntable of the present invention can make incident light sweep all over whole circular arc by the angle that changes between first plane mirror 4 and the incident light, second plane mirror 5 that diverse location on circular arc is placed suitable angle just can allow incident illumination to the sample center, as shown in Figure 5.
Shown in Figure 6, establishing the incident light zenith angle is θ
i, then first plane mirror 4 can be tried to achieve according to set relations with horizontal sextant angle β with horizontal sextant angle α and second plane mirror 5, and concrete derivation is as shown in Figure 6.
Table 1
Among the present invention, because light source itself can not tangential movement, so carry out equivalence by changing the azimuthal method of sample, as can be known if the sample level has turned over θ, be equivalent to light source according to having turned over θ in the other direction, realize the change at light source azimuth angle thus.Sample holder 12 is connected in second rotating shaft 16, and second rotating shaft 16 can be passed through the low thrust bearings, and by a radial bearing and a self-aligning bearing location, bearing fixing is in bearing seat system simultaneously.The lower end of second rotating shaft 16 links to each other with second three-phase stepper motor 21 by the thin slice shaft coupling, controls 21 rotations of second three-phase stepper motor and just can drive second rotating shaft, 16 rotations, thereby light source equivalent level position angle is changed, as shown in Figure 4.
Motor-drive circuit:
Adopt motor-drive circuit to provide the driving signal for each motor, and control signal is responded, realize the control to motor, so that motor requires to rotate according to measuring, finish light source and detector in the motion in hemisphere space.
The rated current of two-phase stepping motor 20 is 2A, and the rated current of first three-phase stepper motor 17 is 4A, and the rated current of second three-phase stepper motor 21 is 5A.Owing to do not adopt subdivision driver to drive, and the duty of motor mainly is to carry out angle orientation rather than rotation continuously, so motor phase current in operational process is not always to equal rated current.Side circuit connects by the parallel way of L298 chip, realizes the output of the maximum 4A of electric current.
1) single-chip microcomputer and motor-drive circuit interface:
Single-chip microcomputer is realized pin multiplexing by 3 74LS273 chips, is respectively 3 L298 control signal is provided.Physical circuit such as Fig. 8 and shown in Figure 9.
Single-chip microcomputer P1.0-P1.7 mouth links to each other with the input end of 3 74LS273 chips, P0.0, P0.1, P0.2 latch end with the clock of 3 chips respectively and link to each other, when the P0.0 rising edge arrives, have only first 273 chip that the data on the data bus are read in like this and refresh output port, when P0.1 and P0.2 rising edge arrive, have only second and the 3rd 273 chips to export equally and refresh, realized the multiplexing of single-chip microcomputer pin thus.
2) two-phase stepping motor driving circuit:
Two-phase stepping motor 20 is the two-phase four-wire system stepper motor, directly drives by 1 L298, and physical circuit as shown in Figure 9.
Four input ends of L298 link to each other in order with low 4 of the output terminal of 74LS273 chip respectively, and output terminal OUT1 and OUT2 connect two-phase stepping motor 20A phase winding, and OUT3 and OUT4 connect two-phase stepping motor 20B phase winding.The Enable Pin of two bridge circuits all meets digital signal power supply+5V, and main circuit power connects+6V, and each output terminal connects two power diodes and is used for afterflow.
Concrete control sequential chart as shown in figure 10.
Realize A → AB → B → BA ' → A ' → A ' B ' → B ' → B ' A → A half step control function of totally 8 states thus, wherein A, A ' represent that respectively two-phase stepping motor 20A phase winding direction of current is positive and negative direction, and B, B ' are in like manner.Total tube voltage drop is about 3.5V during actual measurement L298 chip operation, so this moment, output voltage was 2.5V, because the two-phase induction motor phase resistance is 1.4 Ω, thus though which kind of state, phase current is about 1.8A during energising, can meet design requirement.
3) three-phase stepper motor driving circuit:
First three-phase stepper motor 17 and second three-phase stepper motor 21 are the three-phase three-wire system stepper motor, inner three phase windings are connected into triangle, drive by 3 L298 respectively, the output in parallel of two bridge circuits among each L298, actual each full-bridge has only half brachium pontis work, so just formed a three phase full bridge circuit, physical circuit as shown in figure 11.
The lowest order Q0 of 74LS273 chip output links to each other with EN B with the Enable Pin ENA of first L298 chip, inferior low level Q1 links to each other with IN4 with the input end IN1 of first L298 chip, in like manner, Q2, Q3 link to each other with input end with the Enable Pin of second L298 chip respectively, and Q4, Q5 link to each other with input end with the Enable Pin of the 3rd L298 chip respectively.Each L298 chip all is connected into output mode in parallel, is about to EN A and links to each other with EN B, and IN1 links to each other with IN4, IN2 links to each other with IN3, OUT1 links to each other with OUT4, and OUT2 links to each other with OUT3, and this moment, each L298 chip was equivalent to the triode bridge circuit that an output current can reach 4A.Each L298 chip only with a mouth output, has been equivalent to only use the half-bridge in each chip, and the output of three half-bridge circuits connects three exits of motor respectively by current-limiting resistance.Main circuit power connects+6V, and each output terminal connects two power diodes and is used for afterflow.
Concrete control sequential chart as shown in figure 12.
Realize A → AC ' → C ' → C ' B → B → BA ' → A ' → A ' C → C → CB ' → B ' → B ' A → A half step control function of totally 12 states thus, wherein A, A ' represent that respectively motor A phase winding direction of current is positive and negative direction, and B, B ', C, C ' are in like manner.Because the L298 output voltage is 2.5V, first three-phase stepper motor, 17 phase resistances are 0.5 Ω, and second three-phase stepper motor, 21 phase resistances are 0.6 Ω, so when the current-limiting resistance equal and opposite in direction, as long as first three-phase stepper motor 17 is overcurrent not, second three-phase stepper motor 21 can overcurrent yet.As calculated as can be known current-limiting resistance to get 0.25 Ω more reasonable, can meet design requirement.
Claims (9)
1. a sample bidirectional reflectance distribution function is measured turntable, it comprises laser instrument (1), it is characterized in that, it also comprises detector (2), field lens (3), first plane mirror (4), second plane mirror (5), light source bracket (6), horizontal revolving stage (7), detector erecting frame (8), field lens erecting frame (9), connecting rod (10), sample (11), sample holder (12), base (13), first rotating shaft (14), two end plates (15) and second rotating shaft (16)
Detector erecting frame (8) and field lens erecting frame (9) are arranged on the upper end of connecting rod (10) from top to bottom, connecting rod (10) is by shaft coupling and vertical connection of first rotating shaft (14), first rotating shaft (14) is arranged between two end plates (15), and the bottom of two end plates (15) is fixed on the horizontal revolving stage (7); Detector erecting frame (8) is gone up fixedly detector (2), and field lens erecting frame (9) is gone up fixedly field lens (3);
First plane mirror (4) and second plane mirror (5) are separately positioned on the light source bracket (6), the bottom of light source bracket (6) is fixed on the base (13), base (13) is passed in second rotating shaft (16), the bottom of second rotating shaft (16) connects the center of horizontal revolving stage (7), the top of second rotating shaft (16) connects the center of sample holder (12), and sample holder (12) is gone up the sample (11) of placing placed in the middle;
The parallel beam of laser instrument (1) emission is incident to second plane mirror (5) after first plane mirror (4) reflection, the folded light beam of second plane mirror (5) is incident to the upper surface of sample (11), be incident to the light receiving surface of detector (2) after the folded light beam of sample (11) converges by field lens (3), detector (2) is positioned at the focal length place of field lens (3).
2. sample bidirectional reflectance distribution function according to claim 1 is measured turntable, it is characterized in that it also comprises first three-phase stepper motor (17),
The output shaft of first three-phase stepper motor (17) links to each other with first rotating shaft (14) by the thin slice shaft coupling, and first three-phase stepper motor (17) is used for driving first rotating shaft (14) rotation, thereby detector (2) is moved in the zenith angle direction.
3. sample bidirectional reflectance distribution function according to claim 2 is measured turntable, it is characterized in that, it also comprises follower gear (18), driving gear (19) and two-phase stepping motor (20), and the diameter of follower gear (18) is greater than the diameter of driving gear (19);
Follower gear (18) is socketed in the outer round surface of horizontal revolving stage (7), follower gear (18) matches with driving gear (19), driving gear (19) is socketed on the output shaft of two-phase stepping motor (20), two-phase stepping motor (20) is used for driving driving gear (19) rotation, rotate in the horizontal direction thereby drive horizontal revolving stage (7), realize the azimuthal change of detector (2).
4. sample bidirectional reflectance distribution function according to claim 3 is measured turntable, it is characterized in that it also comprises second three-phase stepper motor (21),
The output shaft of second three-phase stepper motor (21) is connected with second rotating shaft (16), and second three-phase stepper motor (21) drives second rotating shaft (16) rotation, thereby the parallel beam of laser instrument (1) emission is moved at azimuth direction.
5. sample bidirectional reflectance distribution function according to claim 4 is measured turntable, it is characterized in that,
The parallel beam of laser instrument (1) emission is identical with the level height of first plane mirror (4);
Light source bracket (6) is circular-arc, the center of circle of this light source bracket (6) overlaps with the center of sample (11), by changing the angle between first plane mirror (4) and its incident parallel beam, and then change the position of second plane mirror (5) on light source bracket (6), thereby realize that the parallel beam of laser instrument (1) emission is in the motion of zenith angle direction.
6. sample bidirectional reflectance distribution function according to claim 5 is measured turntable, it is characterized in that,
The zenith angle of the parallel beam of laser instrument (1) emission is 0 °, 5 °, 10 °, 15 °, 30 °, 45 °, 60 ° and 75 °.
7. measure turntable according to claim 5 or 6 described sample bidirectional reflectance distribution functions, it is characterized in that,
The position angle of the parallel beam of laser instrument (1) emission is by second three-phase stepper motor (21) control, and half step action step value is 0.6 °,
The zenith angle of detector (2) is by first three-phase stepper motor (17) control, and half step action step value is 0.6 °; The position angle of detector (2) is by two-phase stepping motor (20) control, and half step action step value is 0.6 °.
8. sample bidirectional reflectance distribution function according to claim 7 is measured turntable, it is characterized in that the focal length of field lens (3) is 60mm.
9. sample bidirectional reflectance distribution function according to claim 8 is measured turntable, it is characterized in that the ratio of gear of driving gear (19) and follower gear (18) is 1: 4.5.
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| CN103868870A (en) * | 2014-03-31 | 2014-06-18 | 中国医学科学院生物医学工程研究所 | Blood composition analysis system and method combining absorption spectrum with reflection spectrum |
| CN104458655A (en) * | 2014-11-18 | 2015-03-25 | 北京环境特性研究所 | Device and method for measuring bidirectional scattering characteristics of material |
| CN104677859A (en) * | 2015-02-10 | 2015-06-03 | 华南理工大学 | BSDF (Bidirectional Scattering Distribution Function) measurement system and method for eliminating ambient light interference |
| CN106404676A (en) * | 2015-08-03 | 2017-02-15 | 南京理工大学 | Apparatus for measuring out-of-plane polarization bidirectional reflective function of rough surface |
| CN110702613A (en) * | 2019-10-31 | 2020-01-17 | 中国人民解放军63921部队 | Device and method for testing full-polarization bidirectional reflection distribution of sample |
| CN112730332A (en) * | 2020-12-21 | 2021-04-30 | 安徽建筑大学 | Spectrum polarization bidirectional reflection characteristic measuring device |
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| CN104677859A (en) * | 2015-02-10 | 2015-06-03 | 华南理工大学 | BSDF (Bidirectional Scattering Distribution Function) measurement system and method for eliminating ambient light interference |
| CN106404676A (en) * | 2015-08-03 | 2017-02-15 | 南京理工大学 | Apparatus for measuring out-of-plane polarization bidirectional reflective function of rough surface |
| CN110702613A (en) * | 2019-10-31 | 2020-01-17 | 中国人民解放军63921部队 | Device and method for testing full-polarization bidirectional reflection distribution of sample |
| CN110702613B (en) * | 2019-10-31 | 2020-11-24 | 中国人民解放军63921部队 | Device and method for testing full-polarization bidirectional reflection distribution of sample |
| CN112730332A (en) * | 2020-12-21 | 2021-04-30 | 安徽建筑大学 | Spectrum polarization bidirectional reflection characteristic measuring device |
| CN113176184A (en) * | 2021-04-16 | 2021-07-27 | 长春理工大学 | Simulation device for sea surface target pBRDF measurement and use method thereof |
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Application publication date: 20130710 |