CN205656138U - Vegetation fluorescence chronogenesis measurement system - Google Patents
Vegetation fluorescence chronogenesis measurement system Download PDFInfo
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- CN205656138U CN205656138U CN201620489462.9U CN201620489462U CN205656138U CN 205656138 U CN205656138 U CN 205656138U CN 201620489462 U CN201620489462 U CN 201620489462U CN 205656138 U CN205656138 U CN 205656138U
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Abstract
The utility model discloses a vegetation fluorescence chronogenesis measurement system, automatic measurement system include host computer portion, spectrum appearance portion, provide the power supply of power and measure the support host computer portion and spectrum appearance portion, be provided with the rotating electrical machines on measuring the support, be provided with the glimmering light detector of spectrum on the rotary rod of connection rotating electrical machines, it still is provided with standard reference board to measure the support, host computer portion electricity is connected the data storage of control spectrum appearance portion of spectrum appearance portion, host computer portion electricity is connected rotating electrical machines control the rotating electrical machines carries out the rotation of horizontal plane, spectrum appearance portion is through the fiber connection the glimmering light detector of spectrum, the glimmering light detector of spectrum gathers spectral data.
Description
Technical field
This utility model belongs in agricultural technology field or earth remote sensing scientific domain based on remote sensing technique
The technology being observed the photosynthesis of vegetation, is specifically related to Vegetation canopy sunlight-induced leaf
The automatic measurement system of verdazulene fluorescence.
Background technology
Remote sensing of vegetation is the electromagnetic wave information inverting vegetation reflected by vegetation, radiate and scatter at present
Biophysical parameters and biochemical parameters, such as leaf area index, chlorophyll content etc., photosynthetic
Effect is the physiological process that vegetation is crucial, not only affects the circulation of the material such as carbon, water, and can
Quickly, the stress state of plant is directly reflected.But also lack effective detection vegetation light at present
Close the remote sensing of effect information.
Sunlight-induced chlorophyll fluorescence (Solar-Induced Fluorecence, SIF) and vegetation light
Cooperation is with in close relations, and fluorescence detection is the chlorophyll fluorescence signal obtaining sunlight-induced, is suitable for
Observation lossless to vegetation large area under natural environment, is therefore the most potential remote sensing of one,
Obtain increasingly extensive attention.
Periodical " Remote Sensing Principles of plant sunlight-induced chlorophyll fluorescence and progress " 2012 11
Month volume 27 o. 11th also summarizes the extraction algorithm of SIF, Remote Sensing Model, sensor and
The latest developments of the field application such as detection and efficiency of light energy utilization estimation are coerced in early days in vegetation.
Current research shows, utilizes the high spectrum resolution remote sensing technique can be at the concealed wire wave band of sun incident illumination
(such as oxygen absorption band) extracts the sunlight-induced chlorophyll fluorescence (solar-induced of vegetation
Fluorescence, SIF).This makes it possible to remote sensing technique based on SIF Development of Novel, right
The photosynthesis of vegetation is directly observed, thus serve global change research due, agricultural the yield by estimation with
The key areas such as disaster alarm, Carbon cycle and carbon transaction.SIF remote sensing is at the early-stage, in global range
Need to carry out substantial amounts of observation experiment.Measuring different from clutter reflections rate, the SIF of Vegetation canopy deposits
At obvious diurnal variation and season crack, generally require long-term observation.Additionally, SIF itself is the faintest,
Its Regulatory requirements observed is significantly higher than general clutter reflections rate measure, is therefore badly in need of automatically
Change measurement system, with continuous print, obtain data in high quality.There is presently no the commercialization of maturation
System can reach this requirement.
Utility model content
In order to overcome the above-mentioned deficiency of prior art, solve current business and experimentation urgently needs
The photosynthesis of vegetation is directly observed by remote sensing technique based on SIF, and this utility model provides
A kind of vegetation fluorescence time-ordered measurement system, based on the remote sensing principle sunlight-induced leaf to vegetation
Verdazulene fluorescence (solar-induced Fluorescence, SIF) detects, its Core Feature
Being as the criterion, it is bright synchronously to measure the apparent spoke into the descending spoke brightness and Vegetation canopy shining Vegetation canopy is up
Degree, the vegetation fluorescence time-ordered measurement system that this utility model provides uses non-imaged spectrogrph to carry out light
Spectrometry, is wherein entered the descending spoke brightness according to Vegetation canopy and is obtained by observation standard reference plate, plant
The apparent spoke brightness up by canopy is obtained by observation canopy, and uses SIF extraction algorithm logarithm
According to processing.
Concrete, this utility model provides following technical scheme:
Vegetation fluorescence time-ordered measurement system, including main frame portion, spectrometer section, to main frame portion and spectrum
Instrument portion provides power supply section and the measurement bracket of power supply, and described measurement bracket is provided with electric rotating machine,
Connecting and be provided with spectrum fluorescent probe on the swingle of electric rotating machine, described measurement bracket also sets up
There is the canonical reference plate that can reflect light；Described main frame portion electrically connects described spectrometer section and controls spectrogrph
The data storage in portion, described main frame portion electrically connects the described electric rotating machine described electric rotating machine of control and carries out
The rotation of horizontal plane；Described spectrometer section connects described spectrum fluorescent probe by optical fiber, described
Spectrum fluorescent probe gathers spectroscopic data；
Preferably, the described vinyl chloride sheet that canonical reference plate is Lycoperdon polymorphum Vitt, face coat is calcium oxide.
Preferably, measurement bracket includes base, elongated portion and cross bar, described base and described elongation
Portion is fixing to be connected, and described elongated portion is fixing with described cross bar to be connected.
Preferably, elongated portion adds gusseted bar with the junction of described cross bar.
Preferably, the base of measurement bracket uses axle center symmetric mode non-fully by pole or flat board
Constitute.
Preferably, base bottom is provided with fixed part, fixing connection base and ground.
Preferably, pole being provided with slide rail, fixing seat can be located in the enterprising line slip of slide rail.
Preferably, the elongated portion height of measurement bracket is 3.8m-4.5m, a length of 1.2m-1.8m of cross bar.
Preferably, elongated portion uses double-decker, and internal layer is the cylindric aluminium section bar of 4cm-6cm thickness
Making, outer layer is that the aluminium alloy of 0.5cm-1cm thickness is made, and outer layer and internal layer are carried out by long spiro nail
It coincide fixing.
Compared with prior art, the vegetation fluorescence time-ordered measurement system that this utility model provides, have
Following beneficial effect:
1) the vegetation fluorescence time-ordered measurement system that this utility model provides can detect at scene automatically,
By the detection of sunlight-induced chlorophyll fluorescence being obtained the chlorophyll fluorescence signal of sunlight-induced, natural
Observation lossless to vegetation large area under environment, thus serve global change research due, agricultural the yield by estimation with
The key areas such as disaster alarm, Carbon cycle and carbon transaction.
2) photosynthesis of vegetation can be entered by the vegetation fluorescence time-ordered measurement system that this utility model provides
Row is directly observed, and can meet the needs of business and research with continuous print, obtain data in high quality.
3) the vegetation fluorescence time-ordered measurement system that this utility model provides rotates to enter by motor
Realize being switched fast according in the descending spoke brightness of Vegetation canopy and up apparent spoke brightness measurement, subtract
The calculating error that few incident illumination stably brings, meanwhile, motor rotate have the highest repeatability and
Stability, improves the quality of data.
4) the vegetation fluorescence time-ordered measurement system that this utility model provides only uses an optical fiber and one
Spectrogrph, both can reduce the uncertainty that multiple light path is brought, and it also avoid light path switching and is led
The signal strength weakening caused；
5) this technical scheme is suitable for the field automatic Observation of long period, has the highest cost performance.
Accompanying drawing explanation
Fig. 1 is the ground incident irradiance degree of standard atmosphere；
Fig. 2 is fluorescence spectrum and reflectance spectrum exemplary plot；
Fig. 3 is the structural representation of this utility model vegetation fluorescence time-ordered measurement system；
Fig. 4 is the front view of the measurement bracket of this utility model vegetation fluorescence time-ordered measurement system；
Fig. 5 is the sectional view of the measurement bracket of this utility model vegetation fluorescence time-ordered measurement system；
Fig. 6 is the Vegetation canopy list group measurement procedure of this utility model vegetation fluorescence time-ordered measurement system
Schematic diagram；
Fig. 7 is the top view of the measurement bracket of this utility model vegetation fluorescence time-ordered measurement system.
Detailed description of the invention
For making the purpose of this utility model embodiment, technical scheme and advantage clearer, below will
In conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is entered
Row clearly and completely describes, it is clear that described embodiment is that this utility model part is implemented
Example rather than whole embodiments.Generally herein described in accompanying drawing and this utility model of illustrating
The assembly of embodiment can be arranged with various different configurations and design.Therefore, below to attached
The detailed description of the embodiment of the present utility model provided in figure is not intended to limit claimed basis
The scope of utility model, but it is merely representative of selected embodiment of the present utility model.Based on this practicality
Embodiment in novel, those of ordinary skill in the art are institute under not making creative work premise
The every other embodiment obtained, broadly falls into the scope of this utility model protection.
Vegetation fluorescence time-ordered measurement system of the present utility model is based on remote sensing principle day to vegetation
Photoinduction chlorophyll fluorescence (solar-induced Fluorescence, SIF) detects, distant
Sense detection principle is as follows:
Assume that the transmitting of fluorescence and the reflection on atural object surface are all lamberts, then vegetation is wave band λ's
Apparent spoke brightness L (λ) is made up of the reflection of incident illumination and fluorescence two parts of Plant emission:
L (λ)=r (λ) × E (λ)/π+F (λ) (1)
In formula (1): F (λ) is the fluorescent value of λ wave band, r (λ) is to discharge with fluorescence
Unrelated real reflectance (Actual reflectance), E (λ) is the irradiation inciding vegetation
Degree.Research proves that SIF penetrates lower the faintest at natural light, is only equivalent to vegetation and absorbs luminous energy
0.5%～2%, it is difficult to accurately measure.Due to the air absorption to solar spectrum, arrive earth's surface
The concealed wire having many waveband widths to be 0.1nm～10nm in solar spectrum, i.e. fraunhofer absorb dark
Line.
Fig. 1 is the ground incident irradiance degree of standard atmosphere, in HONGGUANG and near infrared band scope, exists
Article three, more significant concealed wire is i.e.: hydrogen absorbs the H α concealed wire formed at 656nm；In air, oxygen molecule is inhaled
It is received in the 760 and 687nm O2-A concealed wire being formed about and O2-B concealed wires.
Fig. 2 is fluorescence spectrum and reflectance spectrum exemplary plot, absorbs concealed wire wave band at fraunhofer, plants
The reflection light of quilt is the faintest, and fluorescence highlights, and the apparent reflectance showing as vegetation is anti-more than true
Penetrating rate, wherein farther out, O2-A and O2-B concealed wire is green at leaf at H α concealed wire distance chlorophyll fluorescence peak
In element fluorescence peak, but the depth and width of O2-A concealed wire are both greater than O2-B concealed wire, and therefore O2-A is dark
Line is considered optimal remote sensing fluorescence detection wave band.
The technical scheme that vegetation fluorescence time-ordered measurement system of the present utility model provides is namely based at present
Vegetation canopy SIF measuring principle, its Core Feature is as the criterion and synchronously measures into according to Vegetation canopy
Descending spoke brightness and the up apparent spoke brightness of Vegetation canopy, the vegetation fluorescence that this utility model provides
Time-ordered measurement system uses non-imaged spectrogrph to carry out spectral measurement, wherein enters according under Vegetation canopy
Row spoke brightness is obtained by observation standard reference plate, and the up apparent spoke brightness of Vegetation canopy is by seeing
Survey canopy obtains, and data acquisition between the two is rotated by motor and realizes switching.
Below in conjunction with the accompanying drawings this utility model is described in further detail, to make art technology
Personnel can implement according to this with reference to description word.
Embodiment 1
Fig. 3 is the structural representation of this utility model vegetation fluorescence time-ordered measurement system, including main frame portion
100, spectrometer section 200, main frame portion 100 and spectrometer section 200 are provided the power supply section 300 of power supply with
And measurement bracket 400, measurement bracket 400 is provided with electric rotating machine 101, connects electric rotating machine 101
Swingle on be provided with spectrum fluorescent probe 201, measurement bracket 400 is additionally provided with canonical reference
Plate 401, main frame portion 100 electrically connects spectrometer section 200 and electric rotating machine 101, controls electric rotating machine 101
Carrying out the rotation of horizontal plane and complete the storage of the data to spectrometer section 200, spectrometer section 200 passes through
Optical fiber connects spectrum fluorescent probe 201, and spectrum fluorescent probe 201 carries out vegetation to Vegetation canopy
The collection of spectroscopic data.
Wherein, canonical reference plate 401 is positioned at the lower section of swingle Plane of rotation, and concrete is arranged at light
Below the surfaces of revolution of spectrum fluorescent probe 201.
Fig. 4 is the master of the measurement bracket 400 of this utility model embodiment vegetation fluorescence time-ordered measurement system
View, measurement bracket 400 includes base 410, elongated portion 420 and cross bar 430, during measuring
Ensure the stability of measurement bracket 400 and keep not shaking for system under outdoor various interference
The accuracy of measurement data is extremely important, base 410 and the junction of elongated portion 420 in the present embodiment
Strict fixing be connected, especially in elongated portion 420 is used with elongated portion 420 and the junction of cross bar 430
Adding gusseted bar 440 with the junction of cross bar 430 makes cross bar 430 more stable, it is ensured that light
The positional stability of spectrum fluorescent probe 201.
In the present embodiment, the base 410 of measurement bracket 400 can be that the pole that quantity does not limits is constituted,
Can also be made up of the base plate of arbitrary shape, it is also possible to increase fixed part for 410 times at base and make further
Base 410 is fixed with supporters such as ground, and base 410 can be any can to make measurement in a word
The relative ground of support 400 keeps firm structure.
Further, base 410 uses axle center symmetric form non-fully, makes measurement bracket 400 phase
More firm for ground, especially ensure that and keep steady in the environment of there is wind in the external world when outdoor measurement
Gu；
In the present embodiment, elongated portion 420 height of measurement bracket 400 is 3.8m-4.5m, and cross bar 430 is long
Degree is 1.2m-1.8m.
In order to strengthen the steadiness of measurement bracket 400 further, the end that this utility model embodiment provides
The aluminium section bar that seat 410 and elongated portion 420 use density qualities relatively large is made, and cross bar 430 uses matter
The relatively small light type aluminium section bar of metric density is made.
Fig. 5 is the sectional view of the measurement bracket 400 of the automatic measurement system of this utility model embodiment,
Elongated portion 420 uses double-decker, internal layer 421 to be that the cylindric aluminium section bar of 4cm-6cm thickness is made,
Outer layer 422 is made up of the aluminium alloy of 0.5cm-1cm thickness, and outer layer 422 uniformly sets in same horizontal plane
It is equipped with screw slots 4221, long spiro nail 423, corresponding internal layer 421 circle can be set in screw slots 4221
Being provided with screw hole on tubular aluminium section bar, ectonexine structure carries out coincideing by long spiro nail 423 and fixes.
Fig. 6 is that the Vegetation canopy list group measurement procedure of this utility model embodiment automatic measurement system shows
It is intended to, the vegetation fluorescence method for automatic measurement that this utility model provides, is implemented by this utility model
When the vegetation fluorescence time-ordered measurement system of example carries out the measurement of one group of SIF, specifically include following steps:
Step S1: control electric rotating machine 101 rotating rotary rods by main frame portion 100, drives spectrum glimmering
Photo-detector 201 rotates, and makes spectrum fluorescent probe 201 alignment criteria reference plate 401；
Step S2: system optimization observation time of integration above canonical reference plate 401；
Step S3: spectrum fluorescent probe 201 records the spectroscopic data of canonical reference plate 401；
Step S4: control electric rotating machine 101 rotating rotary rods by main frame portion 100, drives spectrum
Fluorescent probe 201 rotates, and makes spectrum fluorescent probe 201 be directed at Vegetation canopy to be measured；
Step S5: system optimization observation time of integration above Vegetation canopy to be measured；
Step S6: spectrum fluorescent probe 201 records Vegetation canopy spectroscopic data.
More than i.e. automatic measurement system carries out the measuring process of one group of SIF, and default can be according to survey
Amount needs to carry out the measurement of many groups SIF of special time, and step makes by main frame portion 100 later
Control electric rotating machine 101 rotating rotary rods, drive spectrum fluorescent probe 201 to rotate, make spectrum
Fluorescent probe 201 realigns canonical reference plate 401 and starts the measurement of new one group of data, repeats
Above step S1-step S6.
In step S2 and step S5, i.e. spectrum fluorescent probe 201 stopped and exposed the observation time of integration
The time of light, system is automatic according to measuring the situations such as the ambient light photograph of situation at that time, temperature and humidity
Arranging, the time of integration, method of adjustment was: when outdoor light is strong, and the spectroscopic data collected is more than
During certain numerical value, reduce acquisition time；When outdoor insufficient light, the spectroscopic data collected is less than
During certain numerical value, increase acquisition time.
Meanwhile, the observation time of integration optimizing spectrogrph is the data in order to obtain high s/n ratio, makes
Measurement data is more accurate, casts aside external interference and obtains closer to real data.
Wherein, canonical reference plate 401 is the vinyl chloride sheet of Lycoperdon polymorphum Vitt, and face coat is calcium oxide, mark
The reflection coefficient of quasi-reference plate 401 can reach 18%, and the acting as of canonical reference plate 401 realizes light
Fully reflective, the numerical value recorded can be deducted from spectral background as reflecting background.
Main frame portion 100 is held what the SIF of Vegetation canopy to be measured measured repeatedly by software control realization
OK, thus realize the automatic measurement system of this utility model embodiment under being not required to manual operation in room
Carry out outward the Continuous Observation of SIF.
The automatic measurement system of this utility model embodiment obtains many by spectrum fluorescent probe 201
Group canonical reference plate 401 spectroscopic data and Vegetation canopy spectroscopic data to be measured, then carry according to SIF
Take algorithm and obtain the sunlight-induced chlorophyll fluorescence data of Vegetation canopy to be measured, the most conventional SIF
Extracting method is method based on spoke brightness measurement, and such method typically utilizes one in sun incidence
The wave band of light concealed wire and the apparent spoke brightness of one or more wave band outside concealed wire, based on certain
Assume to estimate SIF.
SIF extraction algorithm is divided into two big classes at present: method based on spoke brightness and side based on reflectance
Method:
1) method based on spoke brightness
Such method utilizes a wave band (λ in) in fraunhofer line and one (or multiple)
The apparent spoke brightness of the wave band (λ out) outside fraunhofer line, based on certain it is assumed that estimation
The most light activated fluorescence filling extent to " fraunhofer well ", obtains fluorescence information, permissible
Abstract it is formulated as:
F=f (L (λ in), L (λ out-1), L (λ out-2) ..., L (λ out-n)) (2)
In formula (2), L (λ in) is the apparent spoke brightness of wave band, L (λ out in fraunhofer line
-i) it is the apparent spoke brightness of the i-th ∈ [1, n] wave band outside fraunhofer line, calculate function f and set up
Inside and outside fraunhofer line on the reflectance of wave band and certain relevance assumption of fluorescence.
2) method based on reflectance
Based on reflectance obtain the algorithm of fluorescence information essentially by analysis of fluorescence to 650nm～
The impact of 800nm red edge regions reflectance obtains fluorescence information, and obtain is a reaction fluorescence intensity
Reflectance index rather than a clear and definite physical quantity.Fluorescence index based on reflectance is permissible
It is divided three classes: luminance factor value index number (Reflectance Ratios), reflectance first derivative refers to
Number (Derivatives) and filling index (infilling index).
What luminance factor value index number utilized is one is affected strong wave band (680nm or 740nm) by fluorescence
With a reflectance being affected weak wave band by fluorescence.Removed with anti-with the former ratio by the latter
The spectral information that rate of penetrating is relevant, to obtain fluorescence information, conventional index have r690/r600 and
R740/r800 etc..
Reflectance derivative index, as luminance factor value index number, is also a kind of method for normalizing.But
Reflectance derivative index uses reflectance first derivative rather than reflectance itself calculates.
Embodiment 2
The difference of the present embodiment 2 and embodiment 1 is to further define vegetation fluorescence time-ordered measurement system
The measurement bracket 400 of system.
In the present embodiment, the elongated portion height of measurement bracket 400 is 4.116m, a length of 1.5m of cross bar.
Figure is the top view of the measurement bracket of this utility model embodiment vegetation fluorescence time-ordered measurement system.
The base 410 of measurement bracket 400 uses axle center symmetric mode non-fully, four supports divide
Wei support 411, support 412, support 413 and support 414 not constitute, four supports are with elongated portion 420
It is fixedly connected centered by intersection point, and forms both sides with the line of symmetry A of the bearing of trend of cross bar 430
Symmetric shape；
Concrete, support 411 is equal with support 412 length and symmetrical according to line of symmetry A both sides, support
413 and support 414 length is equal and symmetrical according to line of symmetry A both sides, the length of support 411 more than
The length of frame 413, the length of support 412 is more than the length of support 414.
Embodiment 3
The difference of the present embodiment 3 and embodiment 1 is to further define vegetation fluorescence time-ordered measurement system
The measurement bracket 400 of system.
When the base 410 of measurement bracket 400 is made up of pole, pole is provided with slide rail, fixing
Seat can be located in the enterprising line slip of slide rail, thus according to different outdoor test environment adjustable frames
410 with the fixing point of the supporter such as ground, make vegetation fluorescence time-ordered measurement system be applicable to different
The place of observation condition.
Embodiment 4
The present embodiment 4 is to further define the survey of vegetation fluorescence volume system with the difference of embodiment 1
Amount support 400.
The elongated portion 420 of measurement bracket 400 uses double-decker, internal layer 421 to be by the circle of 5cm thickness
Tubular aluminium section bar is made, and outer layer 422 is made up of the aluminium alloy that 0.6cm is thick.
These are only this utility model preferred embodiment, be not used to limit to this utility model, all
Amendment, equivalent and the improvement etc. made within spirit of the present utility model and principle, are required to
Within being included in protection domain of the present utility model.
Claims (9)
1. vegetation fluorescence time-ordered measurement system, it is characterised in that include main frame portion (100), spectrum
Instrument portion (200), main frame portion (100) and spectrometer section (200) are provided the power supply section (300) of power supply
And measurement bracket (400), described measurement bracket (400) is provided with electric rotating machine (101),
Connect and be provided with spectrum fluorescent probe (201) on the swingle of electric rotating machine (101), described
Measurement bracket (400) is additionally provided with the canonical reference plate (401) reflecting light；Described
Main frame portion (100) electrically connects described spectrometer section (200) and controls the data of spectrometer section (200)
Storage, described main frame portion (100) electrically connects described electric rotating machine (101) and controls described electric rotating
Machine (101) carries out the rotation of horizontal plane；Described spectrometer section (200) connects described by optical fiber
Spectrum fluorescent probe (201), described spectrum fluorescent probe (201) gathers spectroscopic data.
Vegetation fluorescence time-ordered measurement system the most according to claim 1, it is characterised in that institute
The canonical reference plate (401) stated is the vinyl chloride sheet of Lycoperdon polymorphum Vitt, and face coat is calcium oxide.
Vegetation fluorescence time-ordered measurement system the most according to claim 1, it is characterised in that institute
The measurement bracket (400) stated includes base (410), elongated portion (420) and cross bar (430),
Described base (410) and described elongated portion (420) are fixing to be connected, described elongated portion (420) and
Described cross bar (430) is fixing to be connected.
Vegetation fluorescence time-ordered measurement system the most according to claim 3, it is characterised in that institute
The elongated portion (420) stated adds gusseted bar (440) with the junction of described cross bar (430).
Vegetation fluorescence time-ordered measurement system the most according to claim 3, it is characterised in that institute
The canonical reference plate (401) stated is arranged at below the surfaces of revolution of spectrum fluorescent probe (201).
Vegetation fluorescence time-ordered measurement system the most according to claim 3, it is characterised in that institute
Base (410) bottom stated is provided with fixed part, fixing connection base (410) and ground.
Vegetation fluorescence time-ordered measurement system the most according to claim 6, it is characterised in that institute
Being provided with slide rail on the base (410) stated, described fixing seat can be located in the enterprising line slip of slide rail.
Vegetation fluorescence time-ordered measurement system the most according to claim 3, it is characterised in that institute
Elongated portion (420) height of the measurement bracket (400) stated is 3.8m-4.5m, cross bar (430)
A length of 1.2m-1.8m.
Vegetation fluorescence time-ordered measurement system the most according to claim 3, it is characterised in that institute
The elongated portion (420) stated uses double-decker, and internal layer (421) is the cylindrical shape of 4cm-6cm thickness
Aluminium section bar is made, and outer layer (422) is that the aluminium alloy of 0.5cm-1cm thickness is made, outer layer (422)
Stake-fastening is carried out by long spiro nail (423) with internal layer (421).
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| CN201620489462.9U CN205656138U (en) | 2016-05-26 | 2016-05-26 | Vegetation fluorescence chronogenesis measurement system |
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| CN201620489462.9U CN205656138U (en) | 2016-05-26 | 2016-05-26 | Vegetation fluorescence chronogenesis measurement system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842220A (en) * | 2016-05-26 | 2016-08-10 | 伯格森(北京)科技有限公司 | Vegetation fluorescence time sequence measuring system and method |
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| CN105842220A (en) * | 2016-05-26 | 2016-08-10 | 伯格森(北京)科技有限公司 | Vegetation fluorescence time sequence measuring system and method |
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Granted publication date: 20161019 Termination date: 20200526 |