CN100443881C - Field BRDF fixed point automatic measuring device - Google Patents
Field BRDF fixed point automatic measuring device Download PDFInfo
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- CN100443881C CN100443881C CNB2004100413157A CN200410041315A CN100443881C CN 100443881 C CN100443881 C CN 100443881C CN B2004100413157 A CNB2004100413157 A CN B2004100413157A CN 200410041315 A CN200410041315 A CN 200410041315A CN 100443881 C CN100443881 C CN 100443881C
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Abstract
The present invention relates to an automatic measuring device used for field BRDF fixed points, which comprises a measuring frame module, a control PC and a spectrum measuring instrument module, wherein the measuring frame module comprises a direction track arc which rotates corresponding to an annular chassis and is arranged on the annular chassis; the lower end of a zenith track arc is fixedly connected with the direction track arc, detector components are fixed on the zenith track arc at intervals, a detector of the detector components points to a measured target in the middle of the direction track arc, and the detector components are connected with the control PC and the spectrum measuring instrument module through signal transmission lines. The present invention is suitable for the rapid measurement of the BRDF characteristics of various natural targets and has the advantages of high precision of radiation measurement and convenient use.
Description
Technical field
The present invention relates to a kind of photoelectron fields of measurement, specifically is exactly a kind of open-air BRDF fixed point self-operated measuring unit, and this device relates to the measurement of the direction reflection characteristic that target image is obtained synchronously.
Background technology
Traditional observation to the target single direction can only obtain the characteristic of a direction of terrain object, lack enough information and infer the main material wave spectrum and the space structure of target simultaneously, and multi-angle to target observation by to the observation of a plurality of directions of fixed ground target, make the observation information of target is enriched, thereby be hopeful therefrom to extract the three-D space structure parameter of the terrain object more detailed and reliable than the observation of single direction, for quantification remote sensing provides new approach.
BRDF (Bidirectional Reflectance Distributional Function) is the bidirectional reflectance distribution function, claims two again to the sexual reflex distribution function, and it is defined as the spoke brightness of body surface reflection and the ratio of the irradiance that incides body surface, that is:
θ in the formula
i, φ
iZenith angle and the position angle of representing incident ray respectively, θ
r, φ
rZenith angle and the position angle of representing reflection ray respectively.The unit of BRDF is Sr
-1DL
r(θ
i, φ
iθ
r, φ
r) be (θ
i, φ
i) the incident irradiance dE of direction
iAt (θ
r, φ
r) the reflection spoke brightness that causes on the direction, in conjunction with Fig. 1.
BRDF has described body surface reflectivity in the unit solid angle on certain orientation, the reflection characteristic of target surface and incident angle and reflection angle are connected, and depending on and measure wavelength, the architectural characteristic of testee, optical characteristics, is the explication to target surface reflection geometrical property.BRDF not only can describe the direction reflection characteristic of target surface perfectly, remedy the deficiency of traditional single direction remote sensing, also help inverting ground albedo, aerosol optical depth, carry out terrain object identification, all multi-usages such as atmospheric correction, satellite image gamma correction.
Present domestic BRDF measurement is divided into two kinds of laboratory measurement and field surveies.
Laboratory measurement BRDF device:
The open-air BRDF measuring system of simulation that domestic comparison has laser bidirectional reflectance (LBRDF) measurement mechanism that the Anhui ray machine developed and Changchun ray machine to be developed by representational laboratory BRDF measurement mechanism.The former locatees accurately, the automaticity height, and sampled point is intensive, but can only measure physical dimension materials with smaller sample.The latter is mainly used to study open-air target BRDF characteristic under laboratory condition, the control of its geometrical orientation drives the circular arc detector carriage by rotating disk and rotates realization, settles one group of detector to realize the observation of different observation angles to target at interval every certain angle on the detector carriage.Light source is placed on the circular arc light source shelf, can move to change incident angle on light source shelf.This covering device can be realized the measurement of the BRDF from the small size vegetation to low tree crown, take measurement of an angle and almost can cover whole hemisphere (except that the hemisphere incident angle), but, promptly must be to cover the expansion light source of target complete view plane in interior parallel incident for having relatively high expectations of light source.
Field survey BRDF device:
Measure than laboratory BRDF, the measurement of open-air target BRDF is much more difficult, need the variable factor of consideration more, the zenith angle, the position angle that have not only comprised zenith angle, position angle and the surveying instrument of the radiation source that under laboratory condition, will consider, complexity factors such as time, weather condition have also been comprised.
Also from the document of publishing, do not search at present the domestic effective open-air BRDF measurement mechanism of design voluntarily.
Technology contents
The purpose of this invention is to provide a kind of novel open-air BRDF fixed point self-operated measuring unit that is used for, it goes for the BRDF characteristic of multiple natural target and measures fast, actinometry precision height, easy to use.
For achieving the above object, the present invention has adopted following technical scheme: a kind of open-air BRDF fixed point self-operated measuring unit, it comprises measurement bay module and control PC and optical spectrum instrumentation module, it is characterized in that: the measurement bay module comprises that annular chassis is provided with the orientation orbital arc that rotates with respect to annular chassis, the lower end of zenith orbital arc and orientation orbital arc are connected, the upper end of zenith orbital arc overhangs to the top, middle part, zone that the orientation orbital arc surrounds, detector assembly shape at interval is fixed on the zenith orbital arc, detector in the detector assembly points to orbital arc middle part, orientation measured target, and detector assembly links to each other with control PC and optical spectrum instrumentation module by signal transmssion line.
Along with the development of quantification remote sensing, more and more higher for the requirement of the precision of BRDF characteristic measuring device and the scope of application.China is for the development technology of BRDF laboratory measurement device comparative maturity, but still lack the field trial device of effectively measuring arbitrary objects surface BRDF characteristic, the open-air BRDF fixed point self-operated measuring unit that is used for disclosed in this invention, it goes for the BRDF characteristic of multiple natural target and measures fast, and device is equipped with laser aiming device and apparatus for synchronizing camera, actinometry precision height, easy to use, device can be according to different incident angles, view angle, different wave bands require to realize the reflection characteristic of testee in the hemisphere spatial dimension.Measurement mechanism adopts detector set to measure, and can carry out the albedo measurement of all directions to target at one time; Adopt PC control step motor action to drive orientation orbital arc and detector set rotation simultaneously, realize that with this observed azimuth changes.This design has guaranteed that this measurement mechanism is easy to use, the characteristics that angle-measurement accuracy is high and measuring period is short.Apparatus for synchronizing camera can be noted measured target state at that time again, enriches metrical information.
Summary of drawings
Fig. 1 is a BRDF definition synoptic diagram;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is the measurement bay structural representation among the present invention.
Embodiment
As Fig. 2, shown in 3, open-air BRDF fixed point self-operated measuring unit, it comprises measurement bay module and control PC and optical spectrum instrumentation module, the measurement bay module comprises that annular chassis 10 is provided with the orientation orbital arc 20 that rotates with respect to annular chassis 10, the lower end of zenith orbital arc 30 and orientation orbital arc 20 are connected, the upper end of zenith orbital arc 30 overhangs to the top, middle part, zone that orientation orbital arc 20 surrounds, detector assembly 40 shape at interval is fixed on the zenith orbital arc 30, detector 41 in the detector assembly 40 points to orientation orbital arc 20 middle part measured targets, and detector assembly 40 links to each other with control PC and optical spectrum instrumentation module by signal transmssion line.Described detector assembly 40 is meant on zenith orbital arc 30 installs one group of sensitive detection parts, and wherein each detector 41 in every group of sensitive detection parts is all drawn control line and linked to each other with control PC and optical spectrum instrumentation module.Described control PC and optical spectrum instrumentation module be to be equipped with notebook computer to constitute on the optical spectrum instrumentation that uses, thereby they have the double action of spectral measurement and control PC when reality is used.
The measurement bay module comprises the stepper motor 50 that is arranged between annular chassis 10 and the orientation orbital arc 20, rotational power is provided, stepper motor 50 can be arranged on the orientation orbital arc 20 during actual the use, annular chassis 10 and stepper motor 50 are by the gear train transferring power, and the detector assembly 40 that is arranged on the zenith orbital arc 30 also comprises laser aiming device 42 and apparatus for synchronizing camera 43.
Described orientation orbital arc 20 is the circular ground machine guide rails that are parallel to ground, be placed on the annular chassis 10, stepper motor 50 provides power drive orientation orbital arc 20 uniformly-spaced to rotate every 15 ° in 0 °～360 ° scopes of annular chassis 10, to realize the variation of observed azimuth.Draw control line on the stepper motor 50 and link to each other, so that 50 actions of PC control step motor with described control PC and optical spectrum instrumentation module.
On 0 °～80 ° scopes of zenith orbital arc 30, settle one group of detector every 5 °～15 °, described detector 41 1 ends are connected to optical spectrum instrumentation by optical fiber, the wave band of detector can be decided according to actual needs, also is provided with laser aiming device 42 and apparatus for synchronizing camera 43 on the wherein vertical detector assembly 40 to target observation.
Described zenith orbital arc 30 is 1/4 circular arc that launches in same plane, and its place cambered surface is vertical with plane, orientation orbital arc 20 place, and each detector assembly 40 all points to measured target.
Below in conjunction with accompanying drawing 2,3 principle of work of the present invention is described: the lining:
When complete machine was switched on, stepper motor rotated on annular chassis 10 at drive orientation orbital arc 20 under the control of PC, stops action when turning to the appointment orientation, uses laser aiming device 42 to see that whether aiming at measured target measures.If aim at, PC sends instruction, makes detector assembly 40 at 0 °～80 ° the scope reflectivity on 5 °～15 ° every bits of surveying testees, by the spectrometer measurement instrument reflectivity data of each point of detecting is collected.The apparatus for synchronizing camera 43 of PC control is simultaneously made a video recording, and notes the actual measurement target state of this moment.
Then PC sends instructions to stepper motor, Electric Machine Control orientation orbital arc 20 continues to forward to next orientation and measures in 0 °～360 ° scopes ... turn to last orientation always, the reflectivity of detector assembly 40 on the every bit of 0 °～80 ° scope measurement testee obtains 2 π angular region spectral distribution curves of a solar incident angle this moment.
Therefore, the present invention can be according to different incident angles, view angle, and different wave bands requires to realize the reflection characteristic of testee in the hemisphere spatial dimension.Measurement mechanism adopts detector set to measure, and can carry out the albedo measurement of all directions to target at one time; Adopt PC control step motor action to drive orientation orbital arc and detector set rotation simultaneously, realize that with this observed azimuth changes.
Claims (5)
1, a kind of open-air BRDF fixed point self-operated measuring unit, it comprises measurement bay module and control PC and optical spectrum instrumentation module, it is characterized in that: the measurement bay module comprises that annular chassis (10) is provided with the orientation orbital arc (20) that rotates with respect to annular chassis (10), the lower end of zenith orbital arc (30) and orientation orbital arc (20) are connected, the upper end of zenith orbital arc (30) overhangs to the top, middle part, zone that orientation orbital arc (20) surrounds, detector assembly (40) shape at interval is fixed on the zenith orbital arc (30), detector (41) in the detector assembly (40) points to orientation orbital arc (20) middle part measured target, and detector assembly (40) links to each other with control PC and optical spectrum instrumentation module by signal transmssion line.
2, open-air BRDF fixed point self-operated measuring unit according to claim 1, it is characterized in that: the measurement bay module comprises the stepper motor (50) that is arranged between annular chassis (10) and the orientation orbital arc (20), rotational power is provided, and the detector assembly (40) that is arranged on the zenith orbital arc (30) also comprises laser aiming device (42) and apparatus for synchronizing camera (43).
3, open-air BRDF fixed point self-operated measuring unit according to claim 1 and 2, it is characterized in that: described orientation orbital arc (20) is the circular ground machine guide rail that is parallel to ground, be placed on the annular chassis (10), stepper motor (50) provides 0 °～360 ° scopes of power drive orientation orbital arc (20) on annular chassis (10) uniformly-spaced to rotate every 15 °, draws control line on the stepper motor (50) and links to each other with described control PC and optical spectrum instrumentation module.
4, open-air BRDF fixed point self-operated measuring unit according to claim 1 and 2, it is characterized in that: on 0 °～80 ° scopes of zenith orbital arc (30), settle one group of detector every 5 °～15 °, described detector (41) one ends are connected to optical spectrum instrumentation by optical fiber, also are provided with laser aiming device (42) and apparatus for synchronizing camera (43) on the wherein vertical detector assembly (40) to target observation.
5, open-air BRDF fixed point self-operated measuring unit according to claim 4, it is characterized in that: described zenith orbital arc (30) is 1/4 circular arc that launches in same plane, its place cambered surface is vertical with orientation orbital arc (20) plane, place, and each detector assembly (40) all points to measured target.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100413157A CN100443881C (en) | 2004-07-08 | 2004-07-08 | Field BRDF fixed point automatic measuring device |
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| CNB2004100413157A CN100443881C (en) | 2004-07-08 | 2004-07-08 | Field BRDF fixed point automatic measuring device |
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| CN1719232A CN1719232A (en) | 2006-01-11 |
| CN100443881C true CN100443881C (en) | 2008-12-17 |
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| CNB2004100413157A Expired - Fee Related CN100443881C (en) | 2004-07-08 | 2004-07-08 | Field BRDF fixed point automatic measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115876A (en) * | 2013-01-25 | 2013-05-22 | 中国科学院合肥物质科学研究院 | Novel field bidirectional reflectance distribution function automatic measuring device |
| US10564096B2 (en) | 2015-09-14 | 2020-02-18 | University Of Florida Research Foundation, Incorporated | Method for measuring bi-directional reflectance distribution function (BRDF) and associated device |
Families Citing this family (9)
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|---|---|---|---|---|
| CN1928533B (en) * | 2006-09-22 | 2010-05-12 | 中国科学院安徽光学精密机械研究所 | Outdoor high optical spectrum BRDF automatic detection method |
| CN102435586B (en) * | 2011-09-16 | 2014-04-16 | 北京师范大学 | Method and system for generating earth surface albedo product |
| CN103606260B (en) * | 2013-11-20 | 2016-05-18 | 中国科学院安徽光学精密机械研究所 | Unmanned field spectrum irradiance meter system based on GPRS remote radio communication technology |
| CN104568772A (en) * | 2014-12-21 | 2015-04-29 | 华东交通大学 | Device and method for detecting content of glutamic acid of tomato leaves by multi-angle in-situ spectrum |
| CN105784592A (en) * | 2014-12-21 | 2016-07-20 | 华东交通大学 | Apparatus for multi-angle in situ spectrum detection of activity of peroxidase in tomato leaves, and method thereof |
| CN104568773A (en) * | 2014-12-21 | 2015-04-29 | 华东交通大学 | Device and method for detecting activity of superoxide dismutase of tomato leaves by in-situ spectrum |
| CN107589078A (en) * | 2017-09-04 | 2018-01-16 | 铜陵恒合光电科技有限公司 | A kind of field ground feature spectrometer that can measure BRDF spatial distributions |
| CN108226051A (en) * | 2018-01-15 | 2018-06-29 | 西京学院 | A kind of light polarization reflection characteristic simulator and its application method |
| CN110346303A (en) * | 2019-08-05 | 2019-10-18 | 东莞南玻太阳能玻璃有限公司 | A kind of glare proof glass glistening intensity measuring instrument |
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| EP0383244A1 (en) * | 1989-02-13 | 1990-08-22 | United Technologies Corporation | Fiber optic scatterometer |
| CN1197208A (en) * | 1996-12-23 | 1998-10-28 | 中国科学院长春光学精密机械研究所 | Measuring device to reflect diffuse reflector and light distribution transmitted through three dimensional space |
| US20020080357A1 (en) * | 2000-11-15 | 2002-06-27 | Dana Kristin J. | Apparatus and method for measuring spatially varying bidirectional reflectance distribution function |
| US20040036882A1 (en) * | 2002-07-17 | 2004-02-26 | Kenneth Perlin | BRDF analyzer |
| CN2713465Y (en) * | 2004-07-08 | 2005-07-27 | 中国科学院安徽光学精密机械研究所 | Fixed point automatic measurement device for field BRDF |
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2004
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Patent Citations (5)
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| EP0383244A1 (en) * | 1989-02-13 | 1990-08-22 | United Technologies Corporation | Fiber optic scatterometer |
| CN1197208A (en) * | 1996-12-23 | 1998-10-28 | 中国科学院长春光学精密机械研究所 | Measuring device to reflect diffuse reflector and light distribution transmitted through three dimensional space |
| US20020080357A1 (en) * | 2000-11-15 | 2002-06-27 | Dana Kristin J. | Apparatus and method for measuring spatially varying bidirectional reflectance distribution function |
| US20040036882A1 (en) * | 2002-07-17 | 2004-02-26 | Kenneth Perlin | BRDF analyzer |
| CN2713465Y (en) * | 2004-07-08 | 2005-07-27 | 中国科学院安徽光学精密机械研究所 | Fixed point automatic measurement device for field BRDF |
Non-Patent Citations (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115876A (en) * | 2013-01-25 | 2013-05-22 | 中国科学院合肥物质科学研究院 | Novel field bidirectional reflectance distribution function automatic measuring device |
| US10564096B2 (en) | 2015-09-14 | 2020-02-18 | University Of Florida Research Foundation, Incorporated | Method for measuring bi-directional reflectance distribution function (BRDF) and associated device |
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| Publication number | Publication date |
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| CN1719232A (en) | 2006-01-11 |
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