CN105606532B - Pest counts and category identification device - Google Patents
Pest counts and category identification device Download PDFInfo
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- CN105606532B CN105606532B CN201510984840.0A CN201510984840A CN105606532B CN 105606532 B CN105606532 B CN 105606532B CN 201510984840 A CN201510984840 A CN 201510984840A CN 105606532 B CN105606532 B CN 105606532B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The present invention disclose a kind of pest count with category identification device, can be improved the accuracy of number of pest and pest species measurement.Device includes: optical sensing probe and electronics module;Optical sensing probe includes collection funnel, cylinder, collection device, first photodiode array, second photodiode array, first infrared light supply, second infrared light supply, collection funnel is connected to cylinder, and it is placed on cylinder, collection device is located under cylinder, first infrared light supply and the first photodiode array, and second infrared light supply and the second photodiode array formed it is double to penetrating symmetrical structure, the signal that electronics module exports the first photodiode array and the second photodiode array is handled, it obtains successively through collection funnel, cylinder falls into the quantity of the pest in collection device, and the digital quantity of characterization pest size, and the type of pest is determined according to digital quantity.
Description
Technical field
The present invention relates to infrared electronic technology and insect communities to monitor field, and in particular to a kind of pest counts to be known with type
Other device.
Background technique
The powerful fertility of pest can be such that it is spread in larger range and region, can all cause farming every year
The huge loss of object.To ensure agricultural output, often pesticide abuse, not only brings serious pollution to environment and ecology
With harm, and the insecticide remained in agricultural product also results in food-safety problem.After adult insect community reaches peak value,
Worm's ovum will be given birth to and breed a large amount of newborn larvaes, this stage is the unique rank that can control pest by spraying insecticide
Section.Therefore, to timely and appropriate discovery spraying insecticide, insect pest is efficiently controlled, key is accurate measurements insect community scale, obtains
The time of insect-taking evil outburst and scale.
Ocular estimate either traditionally and the manual count method based on adhesive trap, still used Remote Spectra,
, all there are some problems in the worm monitoring system of the modern technologies such as radar, machine vision, could not become pest group in given area
Fall the most frequently used most efficient method of estimation.Estimate that the most frequently used most efficient method of insect community is still knot in given area at present
Close the infrared surface light beam sensing technology of trapping trap.This method using pest phototaxis or property telergone to Field Pests into
Row trapping passes through when passing through infrared surface light beam and photodiode to the structure penetrated into the pest for traping trap and detects pest
The variable quantity of luminous energy on photodiode caused by infrared surface light beam is blocked, realizes that pest number counts automatically.Based on infrared skill
In the worm monitoring system of art, no matter pest counting precision or pest species identification accuracy all with photodiode glazing
Energy variable quantity is closely related.Therefore, to accurately realizing that pest counts and category identification using infrared electronic technology, it is necessary to accurate
Acquisition pest luminous energy variable quantity on photodiode is caused by the different phase of infrared surface light beam, and to causing luminous energy to become
The factor of change amount is analyzed.External scientific research personnel uses this technology, has been realized in stored grain pests and orchard pears are small
The real-time dynamic monitoring of heart-eating worm group.Even the case where luring hormone and electric shock trap without using property, obtained using this technology
Pest wing vibration frequency is taken, incorporating signal processing techniques realize the automatic counting for flying into pest and category identification.Although state
Inside and outside scientific research personnel forms many insect communities using infrared electronic technology and monitors system, also plays many beneficial effects
Fruit, but all lack the theory analysis that pest changes over time by luminous energy on photodiode under infrared surface light beam different phase.
Due to lacking theory analysis, when researcher selects infrared area source, the biggish light emitting diode of multiselect light-emitting surface or sharp
Optical diode causes the inhomogeneities of infrared surface beam cross section intensity in induction region as light source.Therefore, induction region not
When falling with position, even identical pest individual due to the inhomogeneities of infrared surface beam cross section intensity, results in pest number
The measurement error of amount and category identification.
Summary of the invention
The object of the present invention is to provide a kind of countings of pest and category identification device, can be improved number of pest and evil
The accuracy of worm type measurement.
It (is applied after insect is killed for this purpose, the present invention proposes that a kind of pest counts with category identification device
Occasion), comprising:
Optical sensing probe and electronics module;Wherein,
The optical sensing probe includes collection funnel, cylinder, collection device, the first photodiode array, the second light
Electric diode array, the first infrared light supply, the second infrared light supply, the collection funnel are connected to the cylinder, and are placed in described
On cylinder, the collection device is located under the cylinder, to ensure that pest successively falls into the receipts through the collection funnel, cylinder
In acquisition means,
First infrared light supply and the first photodiode array and second infrared light supply and the second photoelectricity two
Pole pipe array forms double to symmetrical structure is penetrated, and the infrared surface light beam that first infrared light supply and the second infrared light supply issue is located at
Between the cylinder and collection device, the edge of the upper light-emitting surface of first infrared light supply and the second infrared light supply with it is described
The outer ring of the lower end surface of cylinder is tangent, and the first photodiode array only receives the infrared surface light that first infrared light supply issues
Beam, the second photodiode array only receive the infrared surface light beam that second infrared light supply issues, the infrared surface light beam
Thickness is less than the length of pest,
The electronics module connects first photodiode array and the second photodiode array, to described the
One photodiode array and the signal of the second photodiode array output are handled, and obtain successively leaking through the collection
Bucket, cylinder fall into the quantity of the pest in the collection device, and the digital quantity of characterization pest size, and according to described
Digital quantity determines the type of the pest.
Pest described in the embodiment of the present invention, which counts, passes through acquisition using double to sensing arrangement is penetrated with category identification device
Change of light energy only related with pest size factor itself caused by voltage output, be calculated number of pest and characterization pest
The digital quantity of size, thus realize that the pest species identification based on size is counted with automatic, compared to the prior art,
The present invention, which selects, can issue infrared light supply of the thickness less than the infrared surface light beam of the length of pest, can be avoided measurement pest number
The influence of amount and external influence factors when size becomes pest by luminous energy on photodiode array when infrared surface light beam
Change amount is only related with pest size factor itself, thus the number of pest and pest species that measure are more acurrate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of pest of the present invention counting and one embodiment of category identification device;
Fig. 2 is the schematic diagram that pest of the present invention falls by different phase when infrared surface light beam;
Fig. 3 is the schematic diagram of the optical sensing probe in Fig. 1;
Fig. 4 is the first photodiode array, the second photodiode array, the first infrared light supply and second in Fig. 1
Structural schematic diagram of the infrared light supply relative to cylinder position.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical solution in the embodiment of the present invention is explicitly described, it is clear that described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Shown in as shown in Figure 1, Figure 3 and Figure 4, the present embodiment discloses a kind of pest and counts and category identification device, comprising:
Optical sensing probe 4 and electronics module;Wherein,
The optical sensing probe 4 include collection funnel 5, cylinder 6, collection device 7, the first photodiode array 10,
Second photodiode array 11, the first infrared light supply 8, the second infrared light supply 9, the collection funnel 5 connect with the cylinder 6
It is logical, and be placed on the cylinder 6, the collection device 7 is located under the cylinder 6, to ensure that pest is successively leaked through the collection
Bucket 5, cylinder 6 are fallen into the collection device 7, and the diameter of collection funnel 5 and cylinder 6 can be according to luring the structure of worm trap to carry out
It reasonably selects,
First infrared light supply 8 and the first photodiode array 10 and second infrared light supply 9 and the second light
Electric diode array 11 forms double to penetrating symmetrical structure, the infrared surface that first infrared light supply 8 and the second infrared light supply 9 issue
Light beam between the cylinder 6 and collection device 7, the upper light-emitting surface of first infrared light supply 8 and the second infrared light supply 9
Edge is tangent with the outer ring of the lower end surface of the cylinder 6 (can eliminate irradiation blind spot of the pest by cylinder when), the first light
Electric diode array 10 only receives the infrared surface light beam that first infrared light supply 8 issues, and the second photodiode array 11 is only
The infrared surface light beam that second infrared light supply 9 issues is received, the thickness of the infrared surface light beam is less than the length of pest,
The electronics module connects first photodiode array 10 and the second photodiode array 11, to institute
The signal for stating the first photodiode array 10 and the output of the second photodiode array 11 is handled, and is obtained successively through described
Collection funnel 5, cylinder 6 fall into the quantity of the pest in the collection device 7, and the digital quantity of characterization pest size,
And the type of the pest is determined according to the digital quantity.
Referring to Fig. 4, the second infrared light supply 9, the first infrared light supply 8 and the first photodiode array 10, the second photoelectricity two
The location information of pole pipe array 11 is as follows:
Wherein, 8 light-emitting surface angle 14 of 9 light-emitting surface angle 15 of the second infrared light supply and the first infrared light supply, the second infrared light
Source 9 and the first infrared light supply 8 16 are in the light-emitting surface for guaranteeing the second infrared light supply 9 and the first infrared light supply 8 at a distance from cylinder 6
It is determined under the premise of the outer ring 18 of edge and the lower end surface of cylinder 6 is tangent, the first photodiode array 10 and the second light
Electric diode array 11 17 is to guarantee the first photodiode array 10 and the second photodiode array at a distance from cylinder 6
11 only receive to determine under the premise of to the infrared surface light beam for penetrating structure.
Referring to Fig. 1 and Fig. 3, electronics module include signal conditioning module 19, correlation detector 20, analog-digital converter 21,
Microprocessor 1, signal generator 2 and light source driving 3, complete infrared light supply driving, signal condition, coherent detection, AD conversion and
Acquisition calculates the functions such as output, and the connection relationship between each structure is as shown in fig. 1: the first photoelectricity of optical sensing probe 4
The output end of 11 connection signal conditioning module 19 of diode array 10 and the second photodiode array, signal conditioning module 19 connects
The first input end of correlation detector 20 is connect, the output end of correlation detector 20 connects analog-digital converter 21, analog-digital converter 21
Connect microprocessor 1, the second input terminal of the first output end connection correlation detector 20 of signal generator 2, signal generator 2
Second output terminal connection light source driving 3, light source driving 3 connection optical sensing probes 4 the first infrared light supply 8 and second it is infrared
Light source 9.
Assuming that pest size is greater than infrared surface beam thickness, pest falls during passing through infrared surface light beam, photodiode
The variation of upper light energy can be divided into 3 stages, and as shown in Figure 2: (1) pest initially enters completely into infrared surface light beam rank
Section;(2) pest is completely into initially moving off the infrared surface light beam stage;(3) pest initially moves off leaves infrared surface light completely
The beam stage.Assuming that infrared surface beam thickness and length are respectively W1 and L1, pest width and length are respectively W and L, pest width
W is less than infrared surface beam length L, and cone-shaped collection mouth pest whereabouts initial velocity is 0, height of the cone-shaped collection mouth to infrared surface light beam
Degree is H, and the light energy I amount of changing with time during can obtaining three phases on photodiode is analyzed by freely falling body
Δ I, as shown in formula (1), (2), (3).
Formula (1), (2), (3) show that light energy variable quantity is not only related with pest width W and length L itself factor, and
And it is related with cone-shaped collection mouth to infrared surface light beam distance H and infrared surface beam thickness W1 external factor, it is thus impossible to generally
Fallen using pest during photodiode glazing energy variation amount measure the size of pest figure.It is being based on infrared technique
In the existing literature for carrying out pest counting and size detection, due to lacking the light energy in pest dropping process on photodiode
The theory analysis of variable quantity, infrared light supply mostly use point light source, and infrared surface beam thickness W1 is very big, or even than pest ruler to be measured
It is very little much larger, do not consider external factor, general uses system output voltage caused by photodiode glazing energy variation
Characterization pest size is inaccurate.Formula (1), (3) show that the time interval in 1,3 stages is decided by the thickness of infrared surface light beam
W1, formula (2) shows that the time interval in 2 stages is decided by the difference of pest length L Yu infrared surface beam thickness W1, if infrared
Face beam thickness W1 can control very little, and more much smaller than pest length L to be measured, then the time interval in 1,3 stages is compared
With the time interval in 2 stages, so that it may ignore, i.e., light energy on 2 stage photodiodes is used only in pest dropping process
Variable quantity characterizes the size of pest.If showing, infrared surface beam thickness W1 is fixed as compared with fractional value, light energy variation formula (2)
Amount is only related with pest width W, and light energy variation causes system output voltage to change in 2 phases-time intervals, is become using voltage
Change amount accumulated value can not only realize that pest counts automatically, and be able to use voltage variety accumulated value characterization pest size.
The AC signal that light source driving 3 is generated using signal generator 2, drives the infrared light supply in optical sensing probe 4,
Photodiode array in optical sensing probe 4 outputs signals to signal conditioning module 19, what signal conditioning module 19 exported
Signal carries out coherent detection by the alternating signal that correlation detector 20 and signal generator 2 generate, and extracts useful signal, related
The signal that detector 20 exports is converted by AD converter (analog-digital converter) 21, and the acquisition of microprocessor 1 calculates AD conversion
The digital quantity of the conversion output of device 21, the digital quantity and pest number of characterization pest size are exported by calculating, and realization is based on
The pest species identification of body size is counted with automatic.
Pest described in the embodiment of the present invention, which counts, passes through acquisition using double to sensing arrangement is penetrated with category identification device
Change of light energy only related with pest size factor itself caused by voltage output, be calculated number of pest and characterization pest
The digital quantity of size, thus realize that the pest species identification based on size is counted with automatic, compared to the prior art,
The present invention, which selects, can issue infrared light supply of the thickness less than the infrared surface light beam of the length of pest, can be avoided measurement pest number
The influence of amount and external influence factors when size becomes pest by luminous energy on photodiode array when infrared surface light beam
Change amount is only related with pest size factor itself, thus the number of pest and pest species that measure are more acurrate.
Optionally, it is counted in another embodiment with category identification device in pest of the present invention, the electronics module, packet
It includes:
Signal conditioning module, analog-digital converter and microprocessor;Wherein,
The signal conditioning module connects first photodiode array and the second photodiode array, for pair
First photodiode array and the signal of the second photodiode array output are improved,
The analog-digital converter connects the signal conditioning module, the signal for being exported to the signal conditioning module into
Row analog-to-digital conversion,
The microprocessor connects the analog-digital converter, at the signal for exporting to the analog-digital converter
Reason, obtains the quantity and digital quantity, and the type of the pest is determined according to the digital quantity.
Optionally, it is counted in another embodiment with category identification device in pest of the present invention, the electronics module, also
Include:
Correlation detector and signal generator;Wherein,
The first input end of the correlation detector connects the output end of the signal generator, and the second input terminal connects institute
The output end of signal conditioning module is stated, output end connects the input terminal of the analog-digital converter, the correlation detector, for obtaining
The reference signal of the signal generator output and the signal of signal conditioning module output are taken, the reference signal pair is utilized
The signal of the signal conditioning module output carries out coherent detection, and obtained signal is exported to the analog-digital converter, institute
The frequency for stating reference signal is identical as the frequency for the signal that the signal conditioning module exports, the phase of the reference signal and institute
The phase for stating the signal of signal conditioning module output is identical.
The pest based on infrared technique count automatically and category identification measuring device in, in addition to complete pest fall during
The analysis that light energy changes over time on photodiode, the precision and stability of device are also more crucial.Combining image point
Analysis technology or field studies occasion, device is often exposed under lighting source or external environmental light, if device cannot be eliminated
External environmental light influences, then can directly result in misdescription and the erroneous judgement of device.Consider external environmental light change frequency, is put using locking phase
Big technology carries out coherent detection to the alternating signal of specific frequency, utilizes the ginseng for having identical frequency and phase relation with measured signal
Signal is examined as benchmark, only to measured signal itself and those with reference signal have response with the noise component(s) of phase with frequency,
It can be avoided the influence of external environmental light by this technology, significantly improve device signal-to-noise ratio.In view of pest falling speed
Comparatively fast, smaller pest causes the variable quantity of device output voltage more small when and falling, to device sample frequency and resolution ratio
Also it requires, therefore selects high-speed, high precision analog and digital signal converter when device design, improve point of device output voltage
Resolution.
Optionally, it is counted in another embodiment with category identification device in pest of the present invention, the electronics module, also
Include:
Light source driver module;Wherein,
The light source driver module connects the signal generator, the first infrared light supply and the second infrared light supply, for obtaining
The AC signal for taking the signal generator output, it is infrared according to AC signal driving first infrared light supply and second
Light source luminescent.
Optionally, it is counted in another embodiment with category identification device in pest of the present invention, the infrared surface light beam
Thickness is less than 2mm.
Optionally, it is counted in another embodiment with category identification device in pest of the present invention, first infrared light supply
Forming double infrared surface beam orthogonal irradiating structures in a plane with the second infrared light supply, (structure can eliminate pest whereabouts
The influence of random orientation).
Basic principle of the invention is by establishing pest by infrared surface light beam different phase photodiode array
The mathematical model that luminous energy changes with time, show that different phase pest blocks luminous energy caused by infrared surface light beam and becomes at any time
Change amount is not only related with pest factor itself, also related with external factor.Analysis is the result shows that pass through the red of selection suitable thickness
Outside light beam can eliminate the Change of light energy amount factor unrelated with pest factor itself, can be more smart in conjunction with phase lock amplifying technology
The Change of light energy amount that can characterize pest body size itself really is obtained, realizes that pest accurate counting and high-precision are based on polypide
The pest species of size identify.
As illustrated in fig. 2, it is assumed that the width and length of pest are respectively W and L, the thickness and length of infrared surface light beam are respectively
W1 and L1, and W1 is less than L.Pest passes through 3 stages of infrared surface light beam are as follows: (1) pest initially enters completely into red
The outside light beam stage;(2) pest is completely into starting the infrared surface light beam stage of fading out;(3) pest starts to fade out to completely light
The infrared surface light beam stage out;By establish in 3 stages pest by luminous energy on photodiode array when infrared surface light beam with
The mathematical model of the variable quantity of time discusses the influence factor of this principle of analysis and utilization measurement pest body size.
In view of pest whereabouts random orientation and the uniform characteristic of infrared surface beam cross section, it is that binding analysis obtains as a result,
The uniform infrared surface light beam for selecting suitable thickness avoids the shadow that the external influence factors of pest body size are measured in this principle
It rings, luminous energy variable quantity is only related with pest size factor itself on photodiode array when pest passes through infrared surface light beam, adopts
With double to sensing arrangement and phase lock amplifying technology is penetrated, pass through the light only related with pest size factor itself of acquisition process completion
Energy variable quantity is calculated number of pest and characterizes the digital quantity of pest size, to realize the evil based on body size
Worm category identification and automatic counting.
In the embodiment of the present invention, customized lenses can be selected to form uniform infrared surface light beam, eliminate the different positions in pest whereabouts
Set the influence of infrared surface beam cross section inhomogeneities.
Optionally, it is counted in another embodiment with category identification device in pest of the present invention, the collection funnel is cone
Shape collection funnel.
Optionally, it is counted in another embodiment with category identification device in pest of the present invention, the collection device is circle
Cylinder.
Optionally, it is counted in another embodiment with category identification device in pest of the present invention, first infrared light supply
It is the uniform planar light source that thickness is less than 2mm, the thickness in the gap between the cylinder and collection device with the second infrared light supply
Between 2mm and 5mm, the length of first photodiode array and the second photodiode array is not less than the cylinder
Internal diameter, the width of first photodiode array and the second photodiode array is not less than first infrared light supply
With the thickness of the second infrared light supply.
Device provided by the invention establishes pest in the worm monitoring system based on infrared technique and passes through infrared surface light beam
When photodiode glazing can the amount of changing over time mathematical model, and analysis has been carried out to impact factor therein and has been discussed, benefit
Suitable infrared surface beam thickness is selected with obtaining a result, the selection of guidance instrument scheme and component is based on pest to provide
Figure distinguishes the device counted, and associativity trapping obtains trap, can not only realize the pest species identification based on body size, and
And the type erroneous judgement of same class pest can be eliminated.Device provided by the invention can be lured in conjunction with the property telergone of big Tanaka arrangement
Trap is caught, counting and size identification are carried out to the pest for falling into device into trap and is sorted out, can be Agriculture field pests management system
System provides real-time insect community information, so that the decision of timely and appropriate discovery spraying insecticide is made, it is effective to control crop field pest and disease damage,
Reduce environmental pollution and food-safety problem caused by pesticide abuse.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations are made in the case where bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (8)
1. a kind of pest counts and category identification device characterized by comprising
Optical sensing probe and electronics module;Wherein,
The optical sensing probe includes collection funnel, cylinder, collection device, the first photodiode array, the second photoelectricity two
Pole pipe array, the first infrared light supply, the second infrared light supply, the collection funnel are connected to the cylinder, and are placed in the cylinder
On, the collection device is located under the cylinder, is filled with ensuring that pest successively falls into the collection through the collection funnel, cylinder
In setting,
First infrared light supply and the first photodiode array and second infrared light supply and the second photodiode
Array forms double to symmetrical structure is penetrated, and the infrared surface light beam that first infrared light supply and the second infrared light supply issue is located at described
Between cylinder and collection device, the edge of the upper light-emitting surface of first infrared light supply and the second infrared light supply with the cylinder
Lower end surface outer ring it is tangent, the first photodiode array only receives the infrared surface light beam that first infrared light supply issues,
Second photodiode array only receives the infrared surface light beam that second infrared light supply issues, the thickness of the infrared surface light beam
Less than the length of pest,
The electronics module connects first photodiode array and the second photodiode array, to first light
Electric diode array and the signal of the second photodiode array output are handled, and are obtained successively through the collection funnel, circle
Cylinder falls into the quantity of the pest in the collection device, and the digital quantity of characterization pest size, and according to the number
Amount determines the type of the pest.
2. pest according to claim 1 counts and category identification device, which is characterized in that the electronics module, packet
It includes:
Signal conditioning module, analog-digital converter and microprocessor;Wherein,
The signal conditioning module connects first photodiode array and the second photodiode array, for described
First photodiode array and the signal of the second photodiode array output are improved,
The analog-digital converter connects the signal conditioning module, and the signal for exporting to the signal conditioning module carries out mould
Number conversion,
The microprocessor connects the analog-digital converter, and the signal for exporting to the analog-digital converter is handled, obtained
To the quantity and digital quantity, and determine according to the digital quantity type of the pest.
3. pest according to claim 2 counts and category identification device, which is characterized in that the electronics module, also
Include:
Correlation detector and signal generator;Wherein,
The first input end of the correlation detector connects the output end of the signal generator, and the second input terminal connects the letter
The output end of number conditioning module, output end connect the input terminal of the analog-digital converter, the correlation detector, for obtaining
The reference signal of signal generator output and the signal of signal conditioning module output are stated, using the reference signal to described
The signal of signal conditioning module output carries out coherent detection, and obtained signal is exported to the analog-digital converter, the ginseng
The frequency for examining signal is identical as the frequency for the signal that the signal conditioning module exports, the phase of the reference signal and the letter
The phase of the signal of number conditioning module output is identical.
4. pest according to claim 3 counts and category identification device, which is characterized in that the electronics module, also
Include:
Light source driver module;Wherein,
The light source driver module connects the signal generator, the first infrared light supply and the second infrared light supply, for obtaining
The AC signal for stating signal generator output drives first infrared light supply and the second infrared light supply according to the AC signal
It shines.
5. pest according to claim 1 counts and category identification device, which is characterized in that first infrared light supply and
Second infrared light supply forms double infrared surface beam orthogonal irradiating structures in a plane.
6. pest according to claim 1 counts and category identification device, which is characterized in that the collection funnel is taper
Collection funnel.
7. pest according to claim 1 counts and category identification device, which is characterized in that the collection device is circle
Cylinder.
8. pest according to claim 1 counts and category identification device, which is characterized in that the cylinder and collection device
Between gap thickness between 2mm and 5mm, the length of first photodiode array and the second photodiode array
Degree is not less than the internal diameter of the cylinder, and the width of first photodiode array and the second photodiode array is not less than
The thickness of first infrared light supply and the second infrared light supply.
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