CN102564606A - System and method for monitoring average temperature of large-area wheat canopy - Google Patents

Abstract

The invention discloses a system and a method for monitoring the average temperature of a large-area wheat canopy, and relates to the technical field of online temperature monitoring. The system comprises an infrared detection module, a signal acquiring and processing module and a data processing module, wherein the infrared detection module is used for detecting an infrared radiation signal in a detection region in a preset area; the signal acquiring and processing module is connected with the infrared detection module and is used for serially reading out an electrical signal outputted by the infrared detection module, processing the electrical signal and outputting a digital temperature signal; and the data processing module is connected with the signal acquiring and processing module and is used for inverting the average temperature in a detection region according to the digital temperature signal. The system and the method disclosed by the invention are time-labor-saving and can be used for quickly and accurately monitoring the average temperature of the large-area wheat canopy.

Description

Large tracts of land wheat canopy medial temperature monitoring system and method

Technical field

The present invention relates to the on-line temperature monitoring technical field, relate in particular to a kind of large tracts of land wheat observation medial temperature monitoring system and method.

Background technology

Wheat proportion in the crops of China is very big always.The photosynthesis of research wheat helps improving the specific yield of wheat, and temperature is very huge to photosynthetic influence.Therefore, the temperature of wheat being carried out online timely monitoring, is that agricultural is increased economic efficiency, the necessary ways of production efficiency.

Yet still needleless all adopts the mode of measuring the wheat leaf blade temperature one by one that epidemic situation is judged and early warning to effective monitoring method of wheat leaf blade temperature at present at present.Classic method needs to clamp blade with clip before the thermometric degree, one by one the temperature of wheat is measured, and this measuring method is not only time-consuming takes a lot of work, and blade is also had damage, is difficult for the bulk zone wheat is measured.Though can realize the thermometric purpose of wheat, following defective is arranged:

(1) time-consuming, measuring 100 wheat leaf blade temperature needs half an hour, and it is difficult to use in the wheet-producing area of bulk zone, needs every day the special messenger to measure the labor time;

(2) effort, operating process are comparatively complicated, and operating personnel's skill level is had certain requirement;

(3) the each measurement all has damage in various degree to wheat, faces the contradiction of measuring between quantity and the damage wheat.

Summary of the invention

The technical matters that (one) will solve

The technical matters that the present invention will solve is: a kind of time saving and energy saving, large tracts of land wheat canopy medial temperature monitoring system and the method that can monitor fast and accurately large tracts of land wheat canopy medial temperature are provided.

(2) technical scheme

For addressing the above problem, the invention provides a kind of large tracts of land wheat canopy medial temperature monitoring system, this system comprises: infrared detection module is used to survey the infrared radiation signal in the search coverage of preset area; Signals collecting and processing module link to each other with said infrared detection module, are used for the electric signal of the said infrared detection module output of series read-out, and it is handled, the output digital temperature signal; Data processing module links to each other with processing module with said signals collecting, is used for according to said digital temperature signal the medial temperature in the said search coverage of inverting.

Preferably, said infrared detection module further comprises: infrared eye, place the predeterminated position in the said search coverage, and be used to survey the interior infrared radiation signal of search coverage of preset area; Camera lens is arranged at said infrared eye front end, is used to adjust the field angle of said infrared eye.

Preferably, said infrared eye is substrate with the polycrystalline silicon material.

Preferably, said signals collecting and processing module further comprise: signal gathering unit, link to each other with said infrared detection module, and be used for the electric signal of the said infrared detection module output of series read-out; Signal processing unit links to each other with said signal gathering unit, is used for the electric signal that said signal gathering unit collects is amplified and Filtering Processing, and the signal after amplification and the Filtering Processing is carried out analog to digital conversion one by one, the output digital temperature signal.

Preferably; This device also comprises: control module; Said control module and said signals collecting and processing module and said data processing module all link to each other; Be used for sending sense command, and receive the interior temperature data of said search coverage that said data processing module inverting obtains to said signals collecting and processing module.

The present invention also provides a kind of large tracts of land wheat canopy medial temperature monitoring method, and the method comprising the steps of:

S1. infrared detection module is placed the predeterminated position in the search coverage;

S2. the electric signal of said infrared detection module output is read in serial, and it is handled and export digital temperature signal;

S3. adopt the method for real-time calibration, the black matrix that said search coverage is inner is measured and calibrated, and according to the emissivity of said digital temperature signal and wheat leaf blade, the medial temperature in the said search coverage of inverting.

Preferably, step S2 further comprises:

The electric signal of the said infrared detection module output of S2.1 series read-out;

S2.2 amplifies and Filtering Processing said electric signal, and the signal after amplification and the Filtering Processing is carried out analog to digital conversion one by one, the output digital temperature signal.

Preferably, step S3 further comprises:

S3.1 adopts the real-time calibration mode, and the black matrix that said search coverage is inner is measured and demarcated;

S3.2 obtains the apparent temperature of wheat in the said search coverage according to the emissivity of said digital temperature signal and wheat leaf blade;

S3.3 carries out the radiance correction according to the calibration result of step S3.1 to the said apparent temperature that step S3.2 obtains, and obtains the true temperature of wheat in the said search coverage, generates the medial temperature in the search coverage.

Preferably, among the step S3, the inner black matrix of said search coverage is demarcated and is calculated the apparent temperature of wheat leaf blade according to following formula:

V＝RaεσT ⁴＝KT ⁴

Wherein, V is said digital temperature signal, and T is the absolute temperature of wheat leaf blade, and R is the sensitivity of infrared eye, and a is and the constant of atmospheric attenuation distance dependent, and ε is the emissivity of wheat leaf blade, and timing signal ε gets 1, and σ is Si Difen-Boltzmann constant.

(3) beneficial effect

System and method of the present invention can be monitored wheat zone leveling temperature conditions at certain distance (like 1.5m) with the noncontact mode; Not only can obtain the temperature of wheat leaf blade fast, and can any damage not arranged wheat; Remedied the deficiency of original temp measuring method, thereby the target that realizes the zones of different scope has been monitored.

Description of drawings

Fig. 1 is the large tracts of land wheat canopy medial temperature monitoring system structured flowchart of embodiment 1;

Fig. 2 is the large tracts of land wheat canopy medial temperature monitoring system structural representation of embodiment 2;

Fig. 3 is the large tracts of land wheat canopy medial temperature monitoring method process flow diagram according to one embodiment of the present invention.

Embodiment

Large tracts of land wheat canopy medial temperature monitoring system and method that the present invention proposes specify as follows in conjunction with accompanying drawing and embodiment.

System and method of the present invention is used for the on-line temperature monitoring of large stretch of wheat field.Through system and method for the present invention, can obtain the temperature conditions of regional wheat leaf blade through the noncontact mode, can realize continuous, online temperature monitoring.Its ultimate principle is a blackbody radiation law.All objects that are higher than absolute zero of occurring in nature are not stopping outside emittance; The size of the outside emittance of object and close the getting in touch of ten minutes arranged by the distribution of wavelength and its surface temperature; The temperature of object is high more, and the infrared radiation ability of being sent is strong more.The spectral radiant exitance of black matrix is definite by planck formula, that is:

$M_{\mathrm{\&lambda;}}=\frac{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA0000123063280000013.png"\; state="\{\{state\}\}">C</figure-callout>}}_1}{{\mathrm{\&lambda;}}^5}\&CenterDot;\frac{1}{e^{C_2/\mathrm{\&lambda;}}-1}---\left(1\right)$

Can derive the radiator temperature and detect the relational expression between the voltage by planck formula:

V＝RaεσT ⁴＝KT ⁴ (2)

Wherein, V is detected voltage signal, and K=Ra ε σ is confirmed by experiment; T is the absolute temperature of Measuring Object, and R is a detector sensitivity, and a is the constant with the atmospheric attenuation distance dependent; ε is an emissivity, and timing signal ε gets 1, and σ is Si Difen-Boltzmann constant.

Therefore, can confirm the temperature of testee through detecting voltage, following formula shows that detector output signal and target temperature are nonlinear relationship, and V is directly proportional with the biquadratic of T, so will carry out linearization process.Obtain the apparent temperature of object after the linearization process, need carry out radiance and be modified to true temperature.

Embodiment 1

As shown in Figure 1, the large tracts of land wheat canopy medial temperature monitoring system of present embodiment comprises: infrared detection module, signals collecting and processing module, data processing module and control module.

Wherein:

Infrared detection module is used to survey the infrared radiation signal in the search coverage of preset area.It further comprises: infrared eye places the predeterminated position in the search coverage; Camera lens is arranged at the infrared eye front end, thereby is used to adjust the field angle change investigative range of infrared eye.In order to obtain the temperature conditions of wheat leaf blade in the search coverage, therefore need to obtain the infrared signal radiation characteristic, preferably, it is substrate that the infrared eye of this embodiment adopts polycrystalline silicon material, works at normal temperatures, response wave band is 8 μ m-14 μ m.

Because the signal of infrared eye output is a simulating signal, and comparatively faint, usually at the μ V order of magnitude; Therefore signals collecting links to each other with infrared detection module with processing module; Be used for serial (in proper order) and read the electric signal of infrared detection module output, and it is handled, the output digital temperature signal.This module comprises: signal gathering unit, link to each other with infrared detection module, and be used for the electric signal that infrared eye output is read in serial (in proper order); Signal processing unit; Link to each other with signal gathering unit; Be used for the electric signal that signal gathering unit collects is amplified and Filtering Processing, the signal after amplification and the Filtering Processing is carried out analog to digital conversion one by one, output can be by the digital temperature signal of the scope of analog to digital converter acceptance.

Data processing module links to each other with processing module with signals collecting; Adopt the real-time calibration mode; Black matrix in the said detector investigative range is measured and is demarcated, and according to the emissivity of this digital temperature signal and wheat leaf blade, the medial temperature in the inverting search coverage.

Signals collecting and processing module and data processing module all link to each other with control module through interface, and control module is used for sending sense command to signals collecting and processing module, and receive the interior temperature data of search coverage that the data processing module inverting obtains.

Embodiment 2

As shown in Figure 2; The large tracts of land wheat canopy medial temperature monitoring system of present embodiment is arranged on high 1.5m place, certain farmland; This system comprises: shell 6, camera lens 1, infrared eye 2, signals collecting and processing module and data processing module 3 and support 4, camera lens 1, infrared eye 2, signals collecting and processing module and data processing module 3 all place shell 6.

Wherein, support 4 links to each other with system shell 6, for total system provides support.Control module is long-range upper PC, and signals collecting is communicated by letter through the upper PC of interface 5 and this with processing module and data processing module 3.Apart from wheat 1.5m place infrared eye 2 is being installed, establishing field angle is 26.6 ° of * 2=53.2 °, and the structure according to this field angle is regulated camera lens 1 incides in the camera lens 1 IR of investigative range, and effectively investigative range is about 1.77m ²Solidify with the polycrystalline silicon material camera lens 1 back is the infrared eye 2 of base material.At detector 2 rear end signalization collections and processing module and data processing module 3; Signal series read-out with infrared eye 2 outputs; And amplify, processing such as filtering, analog to digital conversion, again according to the medial temperature of handling in back digital temperature signal and this search coverage of respective algorithms inverting.Signals collecting and processing module and data processing module 3 send to upper PC through serial line interface 5 with corresponding data in real time and receive the various command that upper PC sends.If wheat leaf table emissivity is set to 0.85 in the present embodiment, be finally inversed by medial temperature with this emissivity.In the measuring process processing is measured and demarcated to the black matrix of detector inside, thus the noise of deduction system own.

The present invention also provides a kind of large tracts of land wheat canopy medial temperature monitoring method, and as shown in Figure 3, the method comprising the steps of:

S1. infrared detection module is placed the predeterminated position in the search coverage;

S2. the electric signal of infrared detection module output is read in serial, and it is handled and export digital temperature signal;

S3. adopt the method for real-time calibration, the black matrix of search coverage inside is measured and calibrated, and according to the emissivity of digital temperature signal and wheat leaf blade, the medial temperature in the inverting search coverage.

Step S2 further comprises:

The electric signal of S2.1 series read-out infrared detection module output;

S2.2 amplifies and Filtering Processing electric signal, and the signal after amplification and the Filtering Processing is carried out analog to digital conversion one by one, the output digital temperature signal.

Step S3 further comprises:

S3.1 adopts the real-time calibration mode, and the black matrix of search coverage inside is measured and demarcated;

S3.2 obtains the apparent temperature of wheat in the search coverage according to the emissivity of this digital temperature signal and wheat leaf blade;

S3.3 carries out the radiance correction according to the calibration result of step S3.1 to the apparent temperature that step S3.2 obtains, and obtains the true temperature of wheat in the search coverage, generates the search coverage temperature.

Among the step S3, the black matrix of search coverage inside is demarcated and is calculated the apparent temperature of wheat leaf blade according to formula (2).

Above embodiment only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.

Claims (9)

1. large tracts of land wheat canopy medial temperature monitoring system is characterized in that this system comprises:

Infrared detection module is used to survey the infrared radiation signal in the search coverage of preset area;

Signals collecting and processing module link to each other with said infrared detection module, are used for the electric signal of the said infrared detection module output of series read-out, and it is handled, the output digital temperature signal;

Data processing module links to each other with processing module with said signals collecting, is used for according to said digital temperature signal the medial temperature in the said search coverage of inverting.

2. the system of claim 1 is characterized in that, said infrared detection module further comprises:

Infrared eye places the predeterminated position in the said search coverage, is used to survey the interior infrared radiation signal of search coverage of preset area;

Camera lens is arranged at said infrared eye front end, is used to adjust the field angle of said infrared eye.

3. system as claimed in claim 2 is characterized in that, said infrared eye is substrate with the polycrystalline silicon material.

4. the system of claim 1 is characterized in that, said signals collecting and processing module further comprise:

Signal gathering unit links to each other with said infrared detection module, is used for the electric signal of the said infrared detection module output of series read-out;

Signal processing unit links to each other with said signal gathering unit, is used for the electric signal that said signal gathering unit collects is amplified and Filtering Processing, and the signal after amplification and the Filtering Processing is carried out analog to digital conversion one by one, the output digital temperature signal.

5. the system of claim 1 is characterized in that, this device also comprises:

Control module; Said control module and said signals collecting and processing module and said data processing module all link to each other; Be used for sending sense command, and receive the interior temperature data of said search coverage that said data processing module inverting obtains to said signals collecting and processing module.

6. large tracts of land wheat canopy medial temperature monitoring method is characterized in that the method comprising the steps of:

S1. infrared detection module is placed the predeterminated position in the search coverage;

S2. the electric signal of said infrared detection module output is read in serial, and it is handled and export digital temperature signal;

S3. adopt the method for real-time calibration, the black matrix that said search coverage is inner is measured and calibrated, and according to the emissivity of said digital temperature signal and wheat leaf blade, the medial temperature in the said search coverage of inverting.

7. method as claimed in claim 6 is characterized in that step S2 further comprises:

The electric signal of the said infrared detection module output of S2.1 series read-out;

S2.2 amplifies and Filtering Processing said electric signal, and the signal after amplification and the Filtering Processing is carried out analog to digital conversion one by one, the output digital temperature signal.

8. method as claimed in claim 6 is characterized in that step S3 further comprises:

S3.1 adopts the real-time calibration mode, and the black matrix that said search coverage is inner is measured and demarcated;

S3.2 obtains the apparent temperature of wheat in the said search coverage according to the emissivity of said digital temperature signal and wheat leaf blade;

S3.3 carries out the radiance correction according to the calibration result of step S3.1 to the said apparent temperature that step S3.2 obtains, and obtains the true temperature of wheat in the said search coverage, generates the medial temperature in the search coverage.

9. method as claimed in claim 8 is characterized in that, among the step S3, the inner black matrix of said search coverage is demarcated and calculated the apparent temperature of wheat leaf blade according to following formula:

V＝RaεσT ⁴＝KT ⁴

Wherein, V is said digital temperature signal, and T is the absolute temperature of wheat leaf blade, and R is the sensitivity of infrared eye, and a is and the constant of atmospheric attenuation distance dependent, and ε is the emissivity of wheat leaf blade, and timing signal ε gets 1, and σ is Si Difen-Boltzmann constant.

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