CN201607535U - Pest detecting system based on pest charge measurement - Google Patents

Abstract

The utility model relates to a pest detecting system based on pest charge measurement, which includes a non-contact pest charge sensor, a digital signal processor, a main control and data display and transmission unit, a data receiving and storing unit and a power unit. The system acquires pest charge, processes pest charge signals through the digital signal processing system, conducts mode matching and comparative analysis through the extraction of pest characteristic signals, obtains the position information of pests through the change of signal strength, and realizes the detecting position and precise and efficient killing of pests. With the utility model, the pest detecting system can carry out the electric field measurement on plant roots, and other areas, analyze and process data, judge whether pests exist inside the plant roots or not, determine the position of the pests, and also perform an important role in pest quarantine inspection at the entry and exit port.

Description

Insect detecting system based on insect charge measurement

(1) technical field

The present invention relates to a kind of insect detecting system based on insect charge measurement, this system can realize the detection of insect is located and accurately efficiently slaughtered by Measurement and analysis and statistics to the insect charged characteristic.

(2) background technology

There is not insect detecting system at present both at home and abroad based on insect charge measurement.

Mainly be to come insect is surveyed at present, but all be, do not reach the level of practicability in conceptual phase by the audio frequency or the principle of near infrared spectrum.

(3) summary of the invention

The present invention is based on contactless insect charge measurement and comes insect charge is gathered, and by digital information processing system the insect charge signal is handled then, obtains the positional information of insect.Can utilize the present invention to cross electric field measurement is carried out in zones such as plant roots and stems, data are analyzed and handled, thereby judge whether under cover insect of its inside, and determine its position, when the harmful insect quarantine and examination of entry and exit port, also can bring into play considerable effect.

Native system is made up of noncontact insect charge sensor, digital signal processing unit, master control and data presentation transmission unit, Data Receiving and storage unit, power supply unit.

Noncontact insect charge sensor, by shell, motor unit, the electric field measurement unit, sensor control unit is formed.The situation little at the insect carried charge, that electric field is weak, the dynamic principle of induction of using electric field realizes the measurement to insect charge, and the quasi-electrostatic field measurement mechanism that has adopted a kind of " open and close one's eyes " circulating sampling is as sensor, and the dynamic principle of induction of described electric field is as follows:

The electric field that can distribute around electrified body is placed a metallic conductor in electric field E, conductive surface will produce induced charge, and induced charge density is:

σ＝εKE

ε is airborne specific inductive capacity (specific inductive capacity in the near vacuum) in the formula, and K is because conductor is put into the electric field distortion coefficient that causes.If the area of metallic conductor is S, then the induced charge amount is:

q＝σS＝εKES

If sensor conductor electric capacity over the ground is c, then the induced voltage u of Chan Shenging is:

$u=\frac{q}{c}=\frac{\mathrm{\ϵKES}}{c}$

This metallic conductor just has electric current by a resistance eutral grounding and flows through, and when electric field change, the variation of electric field is just known in the variation of measuring this electric current.But in electrostatic field, electric field is constant substantially or change very slow, measure this electric field, must make the electric charge that produces dynamic change in the conductor that is in the electrostatic field, can adopt certain mode that metallic conductor is shielded for this reason and deshield, thereby produce the dynamic electric current relevant, thereby measure electric field, the dynamic principle of induction of electric field that Here it is with electric field.

Wherein:

Described shell is a barrel-like structure, plays the effect of the electromagnetic screen of mechanical protection.Inner moving plate, stator, shielded partitions one, servomotor, servomotor control power lead shielded-plate tube, power lead and data line shielded-plate tube, metering circuit, shielded partitions two, signal wire shielded-plate tube, ground connection hairspring, moving plate rotation axis, the sensor control unit of placing; And native system has screen layer between each unit, carries out signal by shielded cable and connects.Enclosure connects digital signal processing unit, master control and data presentation transmission unit and power supply unit.

Described motor unit, by moving plate, servomotor, the ground connection hairspring is formed.Moving plate is circular, is with fan-shaped opening, and the not opening portion between the fan-shaped opening is the fan-shaped of same angle, and promptly moving plate is to be evenly distributed on the circumference separately by the fan-shaped opening of identical size and the fan-shaped not opening portion that is all equal angular.Moving plate swings under the drive of servomotor, and pendulum angle is the angle of a fan-shaped opening.Servomotor can rotate to an angle rapidly according to steering order.

Described electric field measurement unit, by stator, metering circuit is formed.Stator is the copper clad plate structure, and the deposited copper on its surface partly is that the metallic conductor as induced charge comes usefulness, and it is corresponding with the fan-shaped opening of moving plate to apply the copper partial shape.Described metering circuit keeps system, high impedance following stage by hardware signal, and fixed gain and controllable gain amplifier stage, filtering stage, buffering output stage, voltage signal differential transfer are partly formed.

Described sensor control unit, the synchronous working of control servomotor and metering circuit is sampled to the signal of electric field measurement unit, the corresponding conversion of electric field intensity and the quantity of electric charge and to the data transmission of digital signal processing unit.

Described moving plate is fixed on the moving plate rotation axis, and the opening that the moving plate rotation axis passes on stator and the shielded partitions one is connected on the servomotor, is connected with the ground connection hairspring on the top of servomotor.Servomotor is fixed on above the shielded partitions two, and is connected with sensor control unit by servomotor control power lead shielded-plate tube.Stator is fixed on above the shielded partitions one by high insulating bodies, and by the signal wire shielded-plate tube signal is passed to metering circuit, and metering circuit and sensor control unit are placed in the annular seal space of shell and shielded partitions two formations jointly.Power lead and the digital signal processing unit of data line shielded-plate tube and outside, master control and the connection of data presentation transmission unit of metering circuit and sensor control unit by passing shell.

Digital signal processing unit, it is the major part of this invention, by the charge signal that measures is carried out wavelet analysis, the characteristic signal that extracts insect carries out pattern match and compare of analysis, and obtains the positional information of insect by the mutation analysis to signal amplitude power and characteristic frequency.

This device has been used wavelet analysis to the insect charge Signal Processing:

The insect charge signal is being carried out in the processing procedure, if certain function ψ (t) meets the following conditions:

$C_{\mathrm{\&Psi;}}={\&Integral;}_{-\&infin;}^{+\&infin;}\frac{{\left|\mathrm{\&psi;}\left(\mathrm{\&omega;}\right)\right|}^2}{\left|\mathrm{\&omega;}\right|}\mathrm{d\&omega;}<\&infin;$

Then small echo is defined as follows:

$W_f(a,b)=<f,{\mathrm{\&Psi;}}_{a,b}>=\frac{1}{\sqrt{a}}{\&Integral;}_{-\&infin;}^{+\&infin;}f\left(t\right)\mathrm{\&Psi;}\left(\frac{t-b}{a}\right)\mathrm{dt}$

By top definition as seen, continuous wavelet ${\mathrm{\&Psi;}}_{a,b}=\frac{1}{\sqrt{a}}\mathrm{\&Psi;}\left(\frac{t-b}{a}\right)$ Effect and the function g in the Gabor conversion (t-τ) e ^{-j ω t}Similar, parameter b and parameter τ play phorogenesis.That essence is different is parameter a and parameter ω, and the latter's variation does not change the size and shape of the g (t) of " window ", and the former variation not only changes the spectrum structure of continuous wavelet, and can change the size and shape of its window.This is because by the fundamental relation formula (1) of Fourier transform as seen, along with reducing of a, ψ _a, the frequency spectrum of b (t) just moves to high frequency direction, and ψ _a, the width of b (t) is then more and more littler.This has just satisfied the high corresponding window of signal frequency should be little, thereby the also high requirement of its resolution on time domain.From the angle of filtering, obvious ψ _a, b (t) is a bandpass filter, when a gets different values, can obtain one group of bandpass filter and bandpass filter group.Pass through wavelet transformation, signal decomposition can be become different frequency ranges, in low frequency part higher frequency resolution and lower temporal resolution are arranged, have higher temporal resolution and lower frequency resolution at HFS, relatively be fit to the insect charge signal of the many noises of low frequency is handled.

Behind the feature charge signal that extracts insect by wavelet analysis, analyze by power and frequency shift (FS) this characteristic signal, can calculate the position of insect, thereby obtain the positional information of insect.

Master control and data presentation transmission unit carry out interface control to the data of noncontact insect charge sensor and digital signal processing unit, and carry out wireless data transmission; Data display unit shows on display screen the intact data of digital signal processing unit processes.

Data Receiving and storage unit receive the data of wireless transmission, and store in database.

Power supply unit provides the power supply of each required Voltage rails of system, and protects positive current and ripple and harmonic parameters and satisfy system's needs, for preferred circuit constitutes.

The innovative point of this invention:

1 based on charge measurement to the insect detection mode.

The non-contact measurement principle of 2 pairs of insect charges.

The swing type design of 3 non-contact insect charge sensors.

The wavelet analysis of 4 pairs of insect charge signals and location Calculation.

(4) description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is a system chart of the present invention.

Fig. 2 is a system construction drawing of the present invention.

Fig. 3 is signal chains figure of the present invention.

1. noncontact insect charge sensors among Fig. 1,2. digital signal processing unit, 3. master control and data presentation transmission unit, 4. emitting antenna, 5. receiving antenna, 6. Data Receiving and storage unit, 7. power supply unit.

2. digital signal processing units among Fig. 2,3. master control and data presentation transmission unit, 7. power supply unit, 8. stator, 9. shielded partitions one, 10. servomotor, 11. servomotor control power lead shielded-plate tube, 12. sensor control unit, 13. power leads and data line shielded-plate tube, 14. metering circuit, 15. shielded partitions, two, 16. signal wire shielded-plate tubes, 17. ground connection hairspring, 18. the moving plate rotation axis, 19. shells, 20. moving plates.

2. digital signal processing units among Fig. 3,3. master control and data presentation transmission unit, 4. emitting antenna, 12. sensor control unit, 21. hardware signal holding circuits, 22. high impedance following stage, 23. fixed gain and controllable gain amplifier stage, 24. filtering stages, 25. buffering output stages, 26. the voltage signal differential transfer, 27. control signal passages.

(5) embodiment

Based on the insect detecting system of insect charge measurement as shown in Figure 1, form by noncontact insect charge sensor 1, digital signal processing unit 2, master control and data presentation transmission unit 3, Data Receiving and storage unit 6, power supply unit 7.Connect by shielded cable between described noncontact insect charge sensor 1, digital signal processing unit 2, master control and data presentation transmission unit 3, emitting antenna 4, the power supply unit 7.Between emitting antenna 4 and receiving antenna 5 is wireless data transmission, is that shielded cable is connected between receiving antenna 5 and Data Receiving and the storage unit 6.

Moving plate 20 is fixed on the moving plate rotation axis 18 in the noncontact insect charge sensor 1, and the opening that moving plate rotation axis 18 passes on stator 8 and the shielded partitions 9 is connected on the servomotor 10, is connected with ground connection hairspring 17 on the top of servomotor 10.Servomotor 10 is fixed on above the shielded partitions 2 15, and is connected with sensor control unit 12 by servomotor control power lead shielded-plate tube 11.Stator 8 is fixed on above the shielded partitions 1 by high insulating bodies, and by signal wire shielded-plate tube 16 signal is passed to metering circuit 14, and metering circuit 14 is placed in the annular seal space of shell 19 and dividing plate 2 15 formations jointly with sensor control unit 12.Metering circuit 14 and sensor control unit 12 by passing shell 19 power lead and the master control and the data presentation transmission unit 3 of data line shielded-plate tube 13 and outside be connected.

Noncontact insect charge sensor 1 can be modulated to AC signal to the charge signal of insect by mechanical copped wave and carry out non-contacting measurement, and improve measurement sensitivity and signal to noise ratio (S/N ratio) by particular design.

Its signal chains as shown in Figure 3, the signal that noncontact insect charge sensor 1 receives is through the ac modulation charge signal of mechanical copped wave, send hardware signal holding circuit 21 to, pass to high impedance following stage 22 then, through the buffering back signal is passed to fixed gain and controllable gain amplifier stage 23, amplification gains, its control signal is from sensor control unit 6, then voltage signal after filtering stage 24 filtering, through buffering output stage 25 and voltage signal differential transfer 26, to sensor control unit 12, pass to digital signal processing unit 2 then, after 2 pairs of signals of digital signal processing unit are handled and are analyzed, the result is passed to master control and data presentation transmission unit 3, show by it then, and through emitting antenna 4 data wireless is sent to Data Receiving and storage unit 6 that receiving antenna 5 is housed and carry out complete data backup and storage.

This working sensor pattern: the measurement of electric field divided for four steps carried out, and circulated according to four kinds of states of " opening eyes "-" open and close transition "-" closing one's eyes "-" close and open transition " and finished one-shot measurement.

When being in " opening eyes " state, deposited copper on the stator 8 partly is exposed under the external electrical field, partly induce corresponding charge at deposited copper, stator 8 and metering circuit 14 are connected, the hardware signal of metering circuit 14 parts keeps system 22 to obtain induced charge, and disconnection stator 8 is connected with metering circuit 14, with stator 8 ground connection, the state of " opening eyes " finishes, and changes " open and close transition " state over to.

At " open and close transition " state, this moment, moving plate 20 turned over the angle of a fan-shaped opening under servomotor 10 drives, and retaining is on the stator 8 of correspondence the time, the external electrical field conductively-closed, and stator 8 can't induced charge, enters " closing one's eyes " state.

When " closing one's eyes " state, whole measuring system is in the state of electromagnetic screen, 14 pairs of signals that are kept at hardware signal holding circuit 21 of metering circuit, carry out the conversion of input and output impedance by high impedance following stage 22, carry out the amplification of signal by fixed gain and controllable gain amplifier stage 23 then, wave scale 24 carries out filtering after filtration again, and signal is driven by buffering output stage 25 then, spreads out of sensor control unit 12 through overvoltage signal differential transfer part 26 and further handles.After recording electric field, change " close and open transition " state over to.

When " close and open transition " state, the disconnection that is connected on stator 8 and ground, moving plate 20 reverse swings, the deposited copper part of stator 8 is exposed under the electric field again, and induced charge is got back to " opening eyes " state then again.So far measurement circulation is finished, and can change the next circulation of measuring over to.

Under this mode of operation, moving plate 20 is the circuit grounds that utilize ground connection hairspring 17 to finish, ground connection hairspring 17 is similar with the hairspring in the clock and watch, when its elastic deformation scope internal strain, life-span is extremely long, and ground connection being belong to metallic circuit ground connection, and is very reliable, can avoid the life-span of brush ground connection short, the rough shortcoming of ground connection.

Digital signal processing unit 2, it is a formant of this invention, be by the charge signal that measures is carried out wavelet analysis, the characteristic signal that extracts insect carries out pattern match and compare of analysis, and by mutation analysis to signal amplitude power and characteristic frequency, through separating one group of form, obtain the positional information of insect at the differential equation group of the Charge Source position model of insect charge feature foundation.Concrete details have following some:

(1) in signal Processing, signal is decomposed into profile information and detailed information by low pass and Hi-pass filter respectively, the multiple dimensioned characteristic of promptly utilizing the orthogonal wavelet basis function is launched signal and is compared under different scale, with the feature of the insect charge signal of determining different scale.In this process, can obtain large scale information, i.e. low-frequency information by low-pass filter---the signal profile information can obtain small scale information by Hi-pass filter, i.e. the signal high-frequency information---noise and sudden change information.

(2) utilize wavelet decomposition reconstruct method filtering baseline wander, the principal ingredient of baseline wander is gradual trend component in the insect charge signal, in wavelet decomposition, can directly be revealed under certain bigger yardstick, as long as in restructuring procedure, the component under this yardstick is directly put 0, but just filtering baseline wander.This method also can be removed the DC component of introducing in measuring simultaneously in the lump, and for the form of signal and change insensitive.

(3) passing threshold method filtering power frequency is disturbed in the processing procedure, and it is a kind of interference that is made of 50Hz and harmonic wave thereof that power frequency is disturbed.This method is based on the bigger coefficient of amplitude and produces this basic assumption by important information and come filtering, that is: its amplitude of wavelet coefficient of producing of signal is bigger, but number is less, and the wavelet coefficient amplitude that is produced by noise is less.Its filtering algorithm is as follows:

(a) calculate the orthogonal wavelet transformation that contains noise signal and select suitable small echo and wavelet decomposition number of plies j, signals and associated noises is carried out wavelet decomposition to the j layer, obtain corresponding coefficient of wavelet decomposition.

(b) wavelet coefficient that decomposition is obtained carries out threshold process.

Master control and data presentation transmission unit 3 carry out interface control to the data of noncontact insect charge sensor 1 and digital signal processing unit 2, and carry out wireless data transmission, and the data that digital signal processing unit 2 is handled show on display screen.

Emitting antenna 4 carries out wireless transmit to data.

Receiving antenna 5 carries out wireless receiving to data.

Data Receiving and storage unit 6 receive the data of wireless transmission, and store in database.

Power supply unit 7 provides the power supply of each required Voltage rails of system, and protects positive current and ripple and harmonic parameters and satisfy system's needs, for preferred circuit constitutes.

Claims (5)

1. insect detecting system based on insect charge measurement is characterized in that native system is made up of noncontact insect charge sensor, digital signal processing unit, master control and data presentation transmission unit, Data Receiving and storage unit, power supply unit; Noncontact insect charge sensor connects master control and data presentation transmission unit by shielded cable, and master control and data presentation transmission unit connect digital signal processing unit and power supply unit by shielded cable; Master control and data presentation transmission unit connect Data Receiving and storage unit by the wireless data transmission mode.

2. the insect detecting system based on insect charge measurement according to claim 1 is characterized in that described noncontact insect charge sensor by shell, motor unit, and the electric field measurement unit, sensor control unit is formed; Between each unit screen layer is arranged, carry out signal by shielded cable and connect.

3. the insect detecting system based on insect charge measurement according to claim 2 is characterized in that described motor unit, by moving plate, and servomotor, the ground connection hairspring is formed; Moving plate swings under the drive of servomotor, and pendulum angle is the angle of a fan-shaped opening; Servomotor can rotate to an angle rapidly according to steering order.

4. the insect detecting system based on insect charge measurement according to claim 2 is characterized in that described electric field measurement unit, and by stator, metering circuit is formed; Described stator is the copper clad plate structure, and the deposited copper on its surface partly is that the metallic conductor as induced charge comes usefulness, and it is corresponding with the fan-shaped opening of moving plate to apply the copper partial shape; Described metering circuit keeps system, high impedance following stage by hardware signal, and fixed gain and controllable gain amplifier stage, filtering stage, buffering output stage, voltage signal differential transfer are partly formed.

5. according to claim 2 or 3 or 4 described insect detecting systems based on insect charge measurement, it is characterized in that described shell is a barrel-like structure, inner moving plate, stator, shielded partitions one, servomotor, servomotor control power lead shielded-plate tube, power lead and data line shielded-plate tube, metering circuit, shielded partitions two, signal wire shielded-plate tube, ground connection hairspring, moving plate rotation axis, the sensor control unit of placing; Moving plate is circular, is with fan-shaped opening, and the not opening portion between the fan-shaped opening is the fan-shaped of same angle, and promptly moving plate is to be evenly distributed on the circumference separately by the fan-shaped opening of identical size and the fan-shaped not opening portion that is all equal angular; Described moving plate is fixed on the moving plate rotation axis, and the opening that the moving plate rotation axis passes on stator and the shielded partitions one is connected on the servomotor, is connected with the ground connection hairspring on the top of servomotor; Servomotor is fixed on above the shielded partitions two, and is connected with sensor control unit by servomotor control power lead shielded-plate tube; Stator is fixed on above the shielded partitions one by high insulating bodies, and by the signal wire shielded-plate tube signal is passed to metering circuit, and metering circuit and sensor control unit are placed in the annular seal space of shell and shielded partitions two formations jointly; Metering circuit is connected with digital signal processing unit, master control and the data presentation transmission unit of outside by power lead and the data line shielded-plate tube that passes shell with sensor control unit.

Images