CN106989700B - A kind of plant canopy leaf area index TRAC measuring instrument based on smart phone - Google Patents
A kind of plant canopy leaf area index TRAC measuring instrument based on smart phone Download PDFInfo
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- CN106989700B CN106989700B CN201710167475.3A CN201710167475A CN106989700B CN 106989700 B CN106989700 B CN 106989700B CN 201710167475 A CN201710167475 A CN 201710167475A CN 106989700 B CN106989700 B CN 106989700B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/28—Measuring arrangements characterised by the use of optical techniques for measuring areas
- G01B11/285—Measuring arrangements characterised by the use of optical techniques for measuring areas using photoelectric detection means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72448—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions
- H04M1/72454—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions according to context-related or environment-related conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- General Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The present invention relates to a kind of plant canopy leaf area index TRAC measuring instrument based on smart phone, which is characterized in that including the TRAC measurement module being fixed on the same support frame and smart phone.The invention proposes a kind of methods realized based on smart phone and measured plant canopy leaf area index TRAC.This method passes through GPS, geographical location information, gyro data, real-time time, real-time weather and the functions such as stronger calculating and storage on introducing smart phone, the main error source for effectively inhibiting the inconsistent of line-transect deviation, travel speed and direction, inclination, the Weather information error of sampling collimation plane etc. that TRAC is caused to measure, improves the precision of traditional TRAC measurement method.The invention is low in cost, using simple, and can preferably adapt to the situation that forestry in China level is different, capital investment is insufficient, provides a kind of practicable inexpensive plant canopy leaf area index measurement scheme for vast agricultural practitioner.
Description
Technical field
The present invention relates to a kind of in such a way that smart phone is realized to leaf area index progress TRAC in plant canopy structure
Inexpensive observation and analysis equipment.
Background technique
Vegetation canopy is that vegetation carries out the most important part of photosynthesis, by the measurement to Vegetation canopy structural parameters,
Solar radiation interception rate, photosynthesis effect, the lower light spatial and temporal distributions of hat etc. can be assessed.Join in many canopy structures
In number, for indicating the leaf area index (Leaf Area Index, LAI) of leaf area total amount on Vegetation canopy unit area most
It is important.The measurement method of LAI can be divided into direct method and indirect method.Direct method canopy leaf area index measurement need to vegetation into
Row destructive sampling on a large scale, such as by the leaf in canopy adopt it is lower after carried out by leaf scanning survey area using leaf area instrument, by
Leaf area index is calculated in this.It is not only resulted in this way to Vegetation canopy structural damage, and manpower and material resources consumption is larger.And
It then can be to avoid the above problem using leaf area index indirect method.Though the hemisphere image LAI measuring technique based on flake camera shooting
Right accuracy and validity with higher, but its measurement over-borrowing, which helps slr camera to combine progress image with fish eye lens, adopts
Collection.This keeps its equipment cost higher, and needs more harsh horizontal collimation information and acquisition time, is unfavorable for hand-held for a long time
Moving operation.And although the handheld devices such as LAI-2000, AccuPAR enhance the portability of equipment, but its measurement result
It can only reflect local Canopy characteristic.The leaf area index in larger area forest zone is measured to it, it is necessary to repeatedly survey by multiple spot
Amount, larger workload.And TRAC (tracing radiation and architecture of canopies, TRAC) mode
The irradiation gap fortune for statistical analysis that canopy is formed is penetrated via to the solar radiation in user's travelling route in use
It calculates, obtains leaf area index.This method is of simple structure and low cost, is especially suitable for leaf area index in assessment larger range
It is evenly distributed situation.But there is also some problems in use for this method.Traveling when TRAC equipment is held due to user
Speed is often influenced to be difficult to keep consistent by barrier etc. with direction, and furthermore there are directions for selected line-transect in outdoor environment
Deviate, thereby resulted in the statistical error to irradiation gap size, this error affects the statistics calculated result of TRAC in turn.
Furthermore common leaf area index measuring device also needs to import data to computer progress accordingly after data acquisition in the market
Analysis, the spatial positional information of data also must ancillary equipment provide, this is also that the field assay of leaf area index is brought not
Just.
The industries such as China's agricultural and forestry have obtained biggish development in recent years.It can be effective to the assessment of leaf area index
The growth course of plant is controlled on ground, and then optimizes its growth parameter(s), to improve its economic benefit.But traditional leaf area refers to
Number measuring device is expensive, uses complexity.And the agricultural and forest management mode in China are mostly based on Sole Proprietorship.Agricultural
Industry practitioner is difficult to undertake equipment cost, the lower level of information technology of practitioner but also be difficult effectively to apply it,
To limit use of traditional leaf area index measuring device in the production of China's agriculture and forestry.
Smart phone is developed rapidly in recent years.Smart phone not only has stronger operational capability and storage energy
Power, and the sensors such as GPS, gyroscope integrated thereon also provide corresponding support energy for its use in a particular application
Power.External measurement module can be such as added on smart phone, then is expected to realize the measuring system based on smart phone.TRAC
Mode has many advantages, such as that algorithm is simple, the measurement scope of application is big, and measurement error mostlys come from by travel speed and direction not
Consistency.And if be modified using the GPS track data in smart phone to irradiation gap data, it is expected to improve measurement essence
Degree.Its GPS data and real-time time can also be convenient for determining traveling line-transect, and the gyroscope in mobile phone also contributes to reminding user
The orientation angles information of TRAC optic probe, thus convenient for users to keeping optic probe vertical.By means of on smart phone
Short-range communication function (such as bluetooth BT BLE), it can be achieved that communication between TRAC measurement module and intelligent movable equipment, make be
System volume and structure are optimized.The operational capability of smart phone and storage capacity also contribute to carrying out TRAC algorithm calculating and
The storage of measurement result.By combining smart phone and TRAC measurement method, it is expected to realization and meets measurement efficiency height, is easy to take
The TRAC measuring system for the conditions such as band, of simple structure and low cost, high reliablity, expansibility be strong.
Summary of the invention
The technical problem to be solved by the present invention is by TRAC plant canopy leaf area index measurement method and smart phone phase
In conjunction with to inhibit due to TRAC travel speed and the inconsistency in direction to be TRAC measurement result bring error.
In order to solve the above-mentioned technical problem, the technical solution of the present invention is to provide a kind of, and the plant based on smart phone is preced with
Layer leaf area index TRAC measuring instrument, which is characterized in that including the TRAC measurement module being fixed on the same support frame and intelligence
Mobile phone, in which:
Support frame, it is hand-held for user；
TRAC measurement module, including light-conductive optic fibre beam, photoelectric conversion section, microcontroller, wireless transmission section and power supply
Part, in which: more TIR type photonic crystal fibers carry out both ends sinter molding according to specific guide-lighting length, and are sintered end
It is polished into and moves towards vertical plane with its fibre core, form light-conductive optic fibre beam, two beam light-conductive optic fibre beams are separately fixed at support frame
The solar radiation for directly being transmitted to get off by canopy and the daylight by ground return time are collected by two beam light-conductive optic fibre beams in both ends respectively
Irradiation；Light-conductive optic fibre beam is connected with photoelectric conversion section, the solar radiation that will be transmitted by light-conductive optic fibre beam by photoelectric conversion section
Sampled signal is converted to electric signal；Microcontroller is measured for sampling to the electric signal that photoelectric conversion section exports
Data；Wireless transmission section, the measurement data for obtaining microcontroller are sent to smart phone；
Smart phone, for reading real-time weather information, only when Weather information be sunny meteorological condition, user start into
Row measurement, before starting measurement, user is set by smart phone: the initial position of sampling is with end position and according to intelligence
The horizontal collimation information setting collimated reference plane that the gyroscope of energy mobile phone provides, and smart phone passes through provided by GPS
Geographical location calculates solar radiation incident direction, is that user points out initial line-transect direction according to solar radiation incident direction；
In measurement process, user advances according to the initial line-transect direction, and the measurement number of TRAC measurement module is received by smart phone
According to, each time complete measurement data reception after read GPS data, as reference position information together with measurement data into
Row storage, meanwhile, smart phone according to gyroscope judge the irrelevance between System planes and collimated reference plane whether be more than
Pre-set threshold value generates alarm if being more than；After completing measurement, TRAC processing is carried out simultaneously to data by smart phone
Calculate leaf area index.
Preferably, the sampling rate of the microcontroller is 8 times per second；The smart phone is connect by bluetooth 8 times per second
Receive the measurement data of the TRAC measurement module.
Preferably, the wireless transmission section uses bluetooth module.
Preferably, support frame as described above uses T-type bracket, and the short side of T-type bracket is perpendicular to the ground, so that ground is directed toward in one end
Face, the other end point into the sky.
Preferably, the photoelectric conversion section select mode field area larger and with the matched photoelectric sensing of light-conductive optic fibre beam
Device, the spectral response range of the photoelectric sensor include photosynthesis wave-length coverage.
Preferably, the power pack uses lithium battery combination LDO mode.
Preferably, the part LDO transfer efficiency with higher and wider temperature working range, to adapt to open air
Mobile use environment.
The invention proposes a kind of methods realized based on smart phone and measured plant canopy leaf area index TRAC.This
Method passes through the GPS, geographical location information, gyro data, real-time time, the real-time weather and stronger that introduce on smart phone
The functions such as calculating and storage effectively inhibit line-transect to deviate, travel speed and the inconsistent, sampling collimation plane of direction are inclined
Tiltedly, the main error source that Weather information error etc. causes TRAC to measure, improves the precision of traditional TRAC measurement method.Furthermore exist
In the TRAC module design for matching mobile phone, realized by the way of photonic crystal fiber combination photoelectric sensor to illumination gap side
The more sharp keen acquisition of edge, and keep sampled data and transmission more convenient using wireless transmission method, and thus reduce system
Weight improves the usage experience of user.The invention is low in cost, using simple, and can preferably adapt to China's forestry hair
The horizontal situation different, capital investment is insufficient of exhibition provides a kind of practicable inexpensive plant hat for vast agricultural practitioner
Layer leaf area index measurement scheme.
Detailed description of the invention
Fig. 1 is a kind of plant canopy leaf area index TRAC gauge systems structure chart based on smart phone；
Fig. 2 is the structure chart of TRAC measurement module part in embodiment；
Fig. 3 is the functional structure chart of smart phone in embodiment.
Specific embodiment
In order to make the present invention more obvious and understandable, hereby with preferred embodiment, and attached drawing is cooperated to be described in detail below.
A kind of plant canopy leaf area index TRAC measuring instrument based on smart phone provided by the invention is measured by TRAC
Module and smart phone form.TRAC measurement module is responsible for acquiring the solar radiation irradiated on gap under canopy, and smart phone is negative
Duty obtains spatial positional information, provides the guidance of TRAC line-transect direction, provide gyrohorizon collimated reference, measure at result
Reason and storage.The two is placed in jointly on a support frame, hand-held for user.User sets acquisition route when use,
And advance according to the voice prompting of smart phone, system can be automatically completed leaf area index measurement and subsequent processing.
In conjunction with Fig. 1 and Fig. 2, TRAC measurement module 1 is by light-conductive optic fibre beam, photoelectric conversion section, microcontroller, bluetooth mould
Block, power pack composition.Previous TRAC measuring device is often used single optical sensor probe, but the problem of this framework
Edge in detection irradiation gap is not sharp keen enough, and lacks correction to probe error, and the weight of fiber-optic sensor probe also can
It brings inconvenience in use.In the present invention, irradiation is collected using multidimensional light-conductive optic fibre beam, lesser front end area makes spoke
It increases according to the edge detection efficiency in gap, lighter weight arm and wrist occurs but also user is less when holding
The shake and offset in portion.But traditional single mode optical fiber or multimode fibre core area is smaller, to the collecting effect of solar radiation
It is not good enough.And photonic crystal fiber can obtain biggish light fibre core by design, to improve irradiation collection effect.In the present invention
In, using full-internal reflection type (TIR) photonic crystal fiber.By 7 TIR type photonic crystal fibers 2 according to specific guide-lighting length into
Row both ends sinter molding, and be sintered end and be polished into and move towards vertical plane with its fibre core, form light-conductive optic fibre beam.Later will
Molding light-conductive optic fibre beam is mounted on the both ends of a T-type bracket according to the method described above.The T-type bracket short side is perpendicular to the ground,
Thus ground is directed toward in one end, one end points into the sky.The collection of two-way light-conductive optic fibre beam is directly transmitted the solar radiation got off by canopy
With the solar radiation returned by ground return.The both ends of light-conductive optic fibre beam should be sufficiently fixed using fixture 3, and intermediate portion is also answered
Avoid the bending that radius is too small.T-type mid-stent is smart phone Horizontal clamp 4, and rear end is portion of the handle 5.TIR type photon is brilliant
The LMA-25 large mode area pcf that body optical fiber 2 is produced using NKT company, mode field diameter are 20.9 microns, in use
Bunchy is sintered using structure identical with seven column optical fiber.T-type bracket uses aluminum alloy materials, and bond length 20cm is long
Edge lengths are 70cm.
The solar radiation sample conversion transmitted by light-conductive optic fibre beam is electric signal by photoelectric conversion section, should be use up in use
Mode field area may be selected larger and with the matched sensor of light-conductive optic fibre beam.Since the present invention is mainly directed towards inexpensive forestry
Application field, and the cost of tradition PAR sensor is usually higher, and TRAC mode is mainly obtained from solar radiation gap size
Leaf area index, so it includes the photoelectricity of photosynthesis wave-length coverage that photoelectric sensor, which selects its spectral response range, in systems
Sensor.Photoelectric conversion section is realized by FDS-100 type photoelectric sensor, it should be noted that in the inclined of FDS-100
End is set to need to use the noise filter being made of 1K Ω resistance and 0.1 μ F to inhibit power supply noise.
Microcontroller is the core control portions of TRAC measurement module, is responsible for passing through photoelectricity to 2 tunnel solar radiation signals
Signal after conversion is sampled, and sampling rate is set to 8 times per second.Microcontroller should select lower power consumption, high reliablity, modulus
Conversion efficiency gets well and is suitable for the model of outdoor environment work.It should can also support the agreements such as UART, I2C, set in order to external
Standby and debugging.TRAC measurement module is low using the PIC24FJ128GC006 type of Wei Xin company product QFN-64 encapsulation in an implementation
Power consumption microcontroller.The reliability and stability of the microcontroller is preferably, weathering characteristics are compared with strong, operating power consumption is lower and has higher
Functional integration, be suitable for monitoring etc. outdoors and integrated level and the higher occasion of stability requirement used.
Two-way operational amplifier built in PIC24FJ128GC006 is used to amplify in an implementation the daylight spoke that photoelectric sensor is exported
According to intensity data.Two-way 16 high-precision Δ ∑ ADC in PIC24FJ128GC006 are put for acquiring by operational amplifier
Big treated solar radiation intensity data.
The measurement data that bluetooth module is responsible for obtaining microcontroller in system provided by the invention is according to 8 hairs per second
Transmission rate is sent to smart phone.Bluetooth module is realized by the RN4020 low-power consumption bluetooth module that Wei Xin company produces.The module
Meet BTBLE standard, the port Tx and Rx of the UART of RN4020 is connected with the Rx of PIC24FJ128GC006 with the port Tx respectively.
System power supply of the invention use lithium battery combination LDO mode, LDO partially answer transfer efficiency with higher and compared with
Wide temperature working range, to adapt to the use environment of outdoor moving.The power supply of the present embodiment is from smart phone.Intelligence
The 5V voltage of mobile phone output is converted to the stable power-supplying voltage of 3.3V for low-power consumption microcontroller by TPS73033 type power supply chip
The components such as device and bluetooth module use.
In the present embodiment, PIC24FJ128GC006 receives the acquisition initiation command that smart phone is sent by RN4020
Afterwards, by two-way high-precision Δ ∑ ADC according to the solar radiation intensity value after the successive acquisition process of 8 frequencies per second, and
Intelligent movable equipment is constantly sent to by RN4020, until receiving that smart phone sends until ceasing and desisting order.
User in smart phone in the form of App software as system provides the monitoring service of TRAC canopy, and mobile phone makes
With the middle end-position for being arranged in T-type bracket.It needs to monitor sampling for canopy leaf area index in smart phone and provide
Corresponding position and routing information service.When user starts to be irradiated gap irradiation acquisition, elder generation is based in App software
The initial position and end position that the provided path setting service initialization of third party's map samples.Since the mode based on TRAC needs
Want user's direction of travel vertical with solar radiation incident direction (line-transect is vertical), so the TRAC before traveling in smart phone
Canopy monitors App and calculates solar radiation incident direction by geographical location provided by GPS, points out initially for user later
Line-transect direction, user advance according to the initial line-transect direction.And smart phone is utilized can also to obtain day by mobile network etc.
Destiny evidence.Since TRAC needs could obtain optimal measurement result under the conditions of fair weather, when TRAC canopy monitoring App passes through
The real-time weather information that api interface is read from other third party's weather App is the non-sunny meteorological condition such as cloudy, negative, then makes
It is issued and is prompted to user with icon.User, which clicks, later starts to carry out sampled measurements.In TRAC measurement, smart phone is logical
The data that bluetooth receives 8 times per second TRAC measurement modules are crossed, and read GPS data after completing data receiver each time,
It is stored in together with measurement data as reference position information in the SD card of smart phone.Gyroscope in smart phone is used for
Horizontal collimation information is provided for system.User sets collimated reference plane before starting test, walks later in hand system
During, smart phone each second carries out 16 samplings to gyro data, if it find that System planes deviate original collimation
Reference planes are more than pre-set threshold value, then are issued and alarmed by prompt tone, and show deviation angle on mobile phone screen.
After completing measurement, smart phone will also carry out TRAC processing to data and calculate leaf area index.Traditional blade face TRAC
Product index meter carries out statistical distribution by the irradiation gap to solar radiation at last and obtains final result.And in the present invention at this
In one calculating process, by importing the GPS data of each sampled point, later according to preset line-transect, using adopting every time
Travel distance between each sampling is done projection to line-transect and calculated by the angle between direction of travel and line-transect between sample, into
And obtain the projection illumination gap of practical correspondence line-transect.It is carried out needed for TRAC leaf area index eventually by projection illumination gap
Statistical distribution calculates, and obtains the plant canopy leaf area index result on corresponding line-transect path.
In an implementation, Baidu is called using Baidu map as the basis for positioning and obtaining travel track information, in use
The api of map exploitation, the example for creating BDLocation, i.e. BDLocation location=new BDLocation (),
Then location information is obtained by location.getAddstr () method.Before measurement starts, according to location information and intelligence
Temporal information in mobile phone is provided zenith angle on [060 °] section and is instructed with 10 ° of line-transects of observation at equal intervals for interval.User's choosing
It can start to measure after taking, record the current location information for corresponding to FDS-100 monitoring data each time in the measurements, and by
These location informations form travel track information.By comparing adjacent two o'clock location information and predetermined line-transect angle, for
Family provides direction of travel amendment guidance, and especially when deviation angle is greater than 15 °, smart phone issues drop drop sound and alerted.
In order to make System planes without departing from collimated reference plane, need to join using the gyroscope in smart phone as auxiliary
Examine information.
Obtain all sensor managers: sensorManager=by sensorManager first in an implementation
(sensorManager)getSystemService(SENSOR_SERVICE).Sensor is recycled to obtain gyro sensors
Device:
Sensor=sensorManager.getDefaultSensor (Sensor.TYPE_GYROSCOPE).
And define public void onSensorChanged (SensorEvent event) { } function definition sensing
The monitor function of device measures the parameter in three directions of gyroscope, and event.value [0] indicates the angular speed of x-axis direction,
Event.value [1] indicates that the angular speed in y-axis direction, event.value [2] indicate the angular speed in z-axis direction.When x, y, z is equal
When being 0, it can be determined that going out mobile phone is placement level.But since user's hand is limited, it is extremely difficult to abswolute level.So
Tolerance threshold value of the system in x, y, z direction is set as 10 °, if deviateing is more than the value, smart phone if passes through sending drop drop sound
It is alerted.
Smart phone also needs to provide weather reference information for user.Read method, that is, mobile phone access net of Weather information
Network obtains json data, is then parsed and be shown on interface to data.Free day is provided in many ways currently, having had
Gas interface, such as google, Sina, Baidu.Using the weather forecast interface of Chinese weather net in application, at this
There is different serial numbers in different cities in interface, such as 01 indicates Beijing, and 02 indicates Shanghai, and 03 indicates Tianjin.It is with Shanghai
, the interface IP address accessed in the design is http://www.weather.com.cn/data/list3/city02.xml,
By accessing the available more detailed address information of the interface.In java code, it is necessary first to example is created,
Parameters para=new Parameters (), according to city phonetic request json data, para.put (" city ",
" shanghai "), then by application API code key access interface information, i.e. ApiStoreSDK.execute (http: //
Apis.baidu.com/heweather/weather/free ", ApiStoreSDK.GET, para, new ApiCallBack
(){}.In the method, if request of data is successful, json data can successfully be obtained.In the json data of acquisition, benefit
Temperature today is obtained with jsonData.getSting (" temp1 "), jsonData.getString (" wind1 ") obtains current
Wind speed etc..
It is communicated between smart phone and TRAC measurement module by BT BLE, the day light detection number that TRAC module obtains
According to thus enter smart phone in.Pass through private BluetoothAdapter_bluetooth=Bluet in implementation first
OothAdapter.getDefaultAdapter () obtains local Bluetooth adapter, by _
Bluetooth.startDiscovery () method searches for bluetooth equipment, utilizes BluetoothDevicedevice=
Intent.getParcelableExtra (BluetoothDevice.EXTRA_DEVICE) obtains setting for search from intent
It is standby, using mobile terminal as client communication, need to create a socket connection, i.e. socket=device.createRfco
mmSocketToServiceRecord(UUID.formString(“a60f35f0-b93a-11de-8a39-
08002009c666 ")), communication is then attached by socket.connect ().
In implementation, drop drop sound alarm is realized by following steps.Sound initialization will be played in implementation first, will be passed through
SoundPool=new soundPool (10, AudioManager.STREAM_SYSTEM, 5), wherein first parameter indicates
The maximum number of play data stream simultaneously, second parameter indicate that data type, third parameter indicate sound quality.Music
=soundPool.load (context, R.raw.beep, 1) is put into the material that can issue drop drop sound in the function
It is second parameter in res/raw as resource file, third parameter is the priority of music.After initialization terminates, lead to
SoundPool.play (music, 1,1,0,0,1) method is crossed to complete the broadcasting of music.
Monitoring data are stored in SD card and are achieved by the steps of: adding user right in manifest first, it may be assumed that
<uses-permissionandroid:name=" android.permission.WRITE_EXTERNAL_
STORAGE”/>。
Then SD card is obtained by Environment.getExtemalStorageDirectory () .toString ()
Root, customized private void writeStr2SDCard (String str) method realizes and writes data into SD card
Function, specific implementation step is using FileOutputStream fos=newFileOutputStream
(getRootPath ()+" filename ")；fos.write(str.getBytes())；Two methods are realized.
Smart phone obtains the real-time time of current Android system by System.currentTimeMills () function.
Claims (7)
1. a kind of plant canopy leaf area index TRAC measuring instrument based on smart phone, which is characterized in that same including being fixed on
TRAC measurement module and smart phone on one support frame, in which:
Support frame, it is hand-held for user；
TRAC measurement module, including light-conductive optic fibre beam, photoelectric conversion section, microcontroller, wireless transmission section and power pack,
Wherein: more TIR type photonic crystal fibers carry out both ends sinter molding according to specific guide-lighting length, and are sintered end and be polished into
Vertical plane is moved towards with its fibre core, forms light-conductive optic fibre beam, two beam light-conductive optic fibre beams are separately fixed at the both ends of support frame, by
Two beam light-conductive optic fibre beams collect the solar radiation for directly being transmitted to get off by canopy and the solar radiation by ground return time respectively；It leads
Light fiber optic bundle is connected with photoelectric conversion section, the solar radiation sampled signal that will be transmitted by light-conductive optic fibre beam by photoelectric conversion section
Be converted to electric signal；Microcontroller obtains measurement data for sampling to the electric signal that photoelectric conversion section exports；Nothing
Line hop, the measurement data for obtaining microcontroller are sent to smart phone；
Smart phone, for reading real-time weather information, only when Weather information is sunny meteorological condition, user starts to survey
Amount, before starting measurement, user is set by smart phone: the initial position of sampling is with end position and according to intelligent hand
The horizontal collimation information setting collimated reference plane that the gyroscope of machine provides, and smart phone passes through geography provided by GPS
Position calculates solar radiation incident direction, is that user points out initial line-transect direction according to solar radiation incident direction；It is surveying
During amount, user advances according to the initial line-transect direction, the measurement data of TRAC measurement module is received by smart phone, often
GPS data is read after the primary reception for completing measurement data, is deposited together with measurement data as reference position information
Storage, meanwhile, smart phone judges whether the irrelevance between System planes and collimated reference plane is more than preparatory according to gyroscope
The threshold value set generates alarm if being more than；After completing measurement, TRAC processing is carried out to data by smart phone and is calculated
Leaf area index out.
2. a kind of plant canopy leaf area index TRAC measuring instrument based on smart phone as described in claim 1, feature
It is, the sampling rate of the microcontroller is 8 times per second；The smart phone receives the TRAC by bluetooth 8 times per second
The measurement data of measurement module.
3. a kind of plant canopy leaf area index TRAC measuring instrument based on smart phone as described in claim 1, feature
It is, the wireless transmission section uses bluetooth module.
4. a kind of plant canopy leaf area index TRAC measuring instrument based on smart phone as described in claim 1, feature
It is, support frame as described above uses T-type bracket, and the short side of T-type bracket is perpendicular to the ground, so that ground is directed toward in one end, the other end refers to
Heavenwards.
5. a kind of plant canopy leaf area index TRAC measuring instrument based on smart phone as described in claim 1, feature
Be, the photoelectric conversion section select mode field area larger and with the matched photoelectric sensor of light-conductive optic fibre beam, the photoelectric transfer
The spectral response range of sensor includes photosynthesis wave-length coverage.
6. a kind of plant canopy leaf area index TRAC measuring instrument based on smart phone as described in claim 1, feature
It is, the power pack uses lithium battery combination LDO mode.
7. a kind of plant canopy leaf area index TRAC measuring instrument based on smart phone as claimed in claim 6, feature
It is, the part the LDO transfer efficiency with higher and wider temperature working range, to adapt to the use of outdoor moving
Environment.
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| CN201710167475.3A CN106989700B (en) | 2017-03-20 | 2017-03-20 | A kind of plant canopy leaf area index TRAC measuring instrument based on smart phone |
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| CN201710167475.3A CN106989700B (en) | 2017-03-20 | 2017-03-20 | A kind of plant canopy leaf area index TRAC measuring instrument based on smart phone |
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