CN105372215A - Pesticide residue quantity detecting device and method - Google Patents
Pesticide residue quantity detecting device and method Download PDFInfo
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- CN105372215A CN105372215A CN201410443153.3A CN201410443153A CN105372215A CN 105372215 A CN105372215 A CN 105372215A CN 201410443153 A CN201410443153 A CN 201410443153A CN 105372215 A CN105372215 A CN 105372215A
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Abstract
The invention provides a pesticide residue quantity detecting device and method. The pesticide residue quantity detecting device comprises a handheld portion and a measuring portion which are connected into a whole; the measuring portion comprises a shell, a photoelectric detector, a microprocessor and at least two LED lamps or laser sources; a first opening is formed in the end of the shell, a spherical containing cavity communicated with the first opening is formed in the shell, and a second opening is formed in the cavity wall, opposite to the first opening, of the containing cavity; the photoelectric detector is arranged in the spherical containing cavity; the microprocessor is used for receiving and processing signals from the photoelectric detector; the LED lamps or laser sources are arranged on the inner wall of the containing cavity, light emitted by the LED lamps or laser sources sequentially penetrates through the second opening and the first opening and then irradiates a detected object to enable fluorescence excited by the detected object to be received by the photoelectric detector and transmitted to the microprocessor to be processed. The detecting device is very convenient to operate; in addition, a sample does not need to be prepared, destroy cannot be caused to the detected agricultural product, the detecting cycle is short, and the pesticide residue quantity in the detected object can be immediately detected only by enabling the detecting device to be close to the detected object and then pressing a switch.
Description
Technical field
The present invention relates to evaluation of pesticides technical field, more particularly, relate to a kind of pesticide residue determination device and method.
Background technology
Food security is the significant problem involved the interests of the state and the people, and the residues of pesticides especially in agricultural product have caused the extensive concern of the whole society.For the vegetable melon and fruit that growth period is short, because disease and pest is many, excessive use agricultural chemicals, the residues of pesticides phenomenon that exceeds standard is caused day by day to increase the weight of, a large amount of residues of pesticides can produce human body and directly poison, the accumulation causing acute poisoning or cause agricultural chemicals in human body and enrichment, thus cause various disease, directly affect health.
Existing crops pesticide residue determination mainly adopts the methods such as gas chromatography, liquid chromatography, gas chromatography-mass spectrography, although measuring accuracy is very high, is used for laboratory and uses, test period is very long, and need to carry out test sample preparation, belong to destructive testing, not fast.But also needing tester to have certain professional technique, the layman be therefore all unsuitable in market, supermarket, the market of farm produce and family uses.
Summary of the invention
The technical problem to be solved in the present invention is, above-mentioned Pesticides Testing equipment for prior art is complicated, need to prepare sample, tested agricultural product are had to destruction, test period is long, require high defect to tester, provide a kind of can the pesticide residue determination device and method of Fast Measurement fruit-vegetable pesticide residues.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of pesticide residue determination device, and comprise the Handheld Division and measurement section that are connected, described measurement section comprises:
Shell, described outer casing end is provided with the first opening, is provided with a spherical container cavity in described shell, and the wall position, chamber that described container cavity is relative with described first opening is provided with the second opening, and described container cavity is communicated with described first opening by the second opening;
Be arranged on the photodetector in described spherical container cavity;
Receive and process the microprocessor from described photo detector signal;
Be arranged at least two LED on described container cavity inwall or lasing light emitter, the light that described LED or lasing light emitter send is sent to described microprocessor processes through being radiated at the fluorescence that measured object makes described measured object excite after the second opening and the first opening by photoelectric detector successively.
In pesticide residue determination device of the present invention, described LED is narrow wave band ultraviolet LED lamp, and the centre wavelength of described LED or lasing light emitter lamp is between 260nm-360nm.
In pesticide residue determination device of the present invention, the LED that centered by described at least two LED or lasing light emitter (25), wavelength is different or lasing light emitter.
In pesticide residue determination device of the present invention, each described LED or lasing light emitter to be installed in the middle part of described container cavity and at grade respectively, and the light beam that each described LED or lasing light emitter send is relative with described second opening.
In pesticide residue determination device of the present invention, described shell is provided with display screen away from one end of described first opening, described display screen is arranged on the side of described photodetector away from described LED or lasing light emitter, and described display screen is electrically connected with described microprocessor and testing result for showing described measured object.
In pesticide residue determination device of the present invention, be embedded with window in described second opening, described window is made up of fused quartz.
In pesticide residue determination device of the present invention, described photodetector is provided with gradual filter near described LED light-sensitive surface, described gradual filter be 300nm-600nm through wavelength.
In pesticide residue determination device of the present invention, described gradual filter is provided with the post lens for optically focused near the side of described LED.
In pesticide residue determination device of the present invention, described microprocessor is electrically connected with each described LED or lasing light emitter and photodetector respectively.
Present invention also offers a kind of pesticide residue determination method, use pesticide residue determination device described above, comprise the following steps:
Prestore the spectroscopic data of common fruits and vegetables and agricultural chemicals in microprocessor;
Hand-held described pesticide residue determination device, makes its first opening near measured object;
The light that described LED or lasing light emitter send is radiated on described measured object through after the second opening and the first opening successively;
The fluorescence transfer that agricultural chemicals residual on described measured object excites is on photodetector;
Described photodetector changes the light signal of described measured object into electric signal, and sends microprocessor to and process;
By the display of the result of described microprocessor on a display screen;
When detecting on measured object that residual agricultural chemicals exceeds national Specification, warning horn gives the alarm sound.
Implement pesticide residue determination device and method of the present invention, there is following beneficial effect: user's this pick-up unit hand-holdable detects measured object, easy to operate; And without the need to preparing sample, can not damaging tested agricultural product, test period is short, only by this pick-up unit near measured object, then need press switch, just immediately can measure the residues of pesticides in measured object, the whole testing process cycle is short; This pick-up unit is to tester without professional requirement, and the user being applicable to all age group uses, and is applicable to each places such as market, supermarket, the market of farm produce, easy to use; And owing to have employed the principle of fluorescence spectral measuring, can on-the-spot noncontact measured object and obtain measurement result in real time, just with the quick detection of pesticide residue.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of the pick-up unit that present pre-ferred embodiments provides;
Fig. 2 is the structured flowchart of the pick-up unit in Fig. 1.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
As depicted in figs. 1 and 2, the pesticide residue determination device that present pre-ferred embodiments provides, comprise the Handheld Division 1 and measurement section 2 that are connected, this pick-up unit is held for making user in Handheld Division 1, and measurement section 2 is for detecting the residual quantity of agricultural chemicals on measured object near measured object.Wherein, described measured object is the vegetable melon and fruits such as apple, banana, Chinese cabbage, this pick-up unit is applicable to the places such as market, supermarket, the market of farm produce, people can be helped promptly to understand the number of the pesticide residue contained in agricultural product, whether meet national regulation.
The pesticide residue determination device of the present embodiment also comprises the switch 3 of control survey portion 2 closure or openness, and this switch 3 is arranged on the side of Handheld Division 1 near measurement section 2, and be fixed on the outside surface of Handheld Division 1, when needing the persticide residue measuring gourd, fruit and vegetable, user holds this Handheld Division 1 and makes measurement section 2 near agricultural product such as gourd, fruit and vegetables, then presses switch 3 and makes measurement section 2 pairs of agricultural product carry out the detection of persticide residue.
Handheld Division 1 is roughly square, the battery 11 that in-built promising measurement section 2 is powered in Handheld Division 1, and battery 11 is electrically connected with switch 3, and is powered for measurement section 2 by the closure or openness control battery 11 of switch 3.Particularly, battery 11 can be rechargeable battery or dry cell, to facilitate charging or to change.
Measurement section 2 for close measured object, and detects pesticide concentration residual in this measured object.Measurement section 2 comprises shell 21, container cavity 22, photodetector 23, microprocessor 24, LED 25, gradual filter 26, post lens 27, display screen 28 and window 29, container cavity 22, photodetector 23, microprocessor 24, LED 25, gradual filter 26, post lens 27, display screen 28 and window 29 are all housed in described shell 21, and LED 25, photodetector 23 and display screen 28 are electrically connected with microprocessor 24 respectively.Herein, LED 25, also can adopt lasing light emitter (lower same).
Shell 21 is roughly square, one end of shell 21 is provided with the first opening 211, this first opening 211 for close measured object, and is radiated on this measured object after light transmission first opening 211 that the LED 25 in shell 21 is sent, thus excites agricultural chemicals residual on measured object to produce fluorescence.
Container cavity 22 is spherical, and this spherical container cavity 22 communicates with the first opening 211 and is arranged on the side near the first opening 211, and the chamber wall of container cavity 22 is made up of metal material, and it is inner to be fixed on shell 21.Be appreciated that the chamber wall of container cavity 22 also can be made of plastics, do not limit at this.
The inwall of container cavity 22 is provided with at least two LED 25, and the container cavity 22 chamber wall relative with the first opening 211 is provided with the second opening 221, second opening 221 communicates with the first opening 211 and position is relative, then the light that LED 25 sends is radiated on described measured object through after the second opening 221 and the first opening 211 successively.In the present embodiment, the second opening 221 is the circular open of diameter 8mm-12mm, appears as far as possible, obtain maximum optical energy utilization efficiency with the light making LED 25 send.Preferably, in the second opening 221, be embedded with described window 29, namely the second opening 221 is sealed up by window 29, to make container cavity 22 and external isolation, plays the effect of other parts such as LED 25 grade in protection container cavity 22.Window 29 can be made up by material that is luminous through LED and fluorescence of fused quartz or other, after the light transmission window 29 that namely LED 25 sends, then is radiated on measured object through the first opening 211.
LED 25 is narrow wave band ultraviolet LED lamp, and the centre wavelength of LED 25 is between 260nm-360nm, and full width at half maximum is about 10nm, and different wavelength has different fluorescence excitation efficiency to residues of pesticides materials different on measured object.In the present embodiment, LED 25 is at least two, the centre wavelength of each LED 25 is different, and each LED 25 to be installed in the middle part of container cavity 22 and at grade respectively, thus LED 25 to be arranged on the internal chamber wall of container cavity 22 with radial direction and to surround a circle, make the utilizing emitted light of the LED 25 in container cavity 22 even, and guarantee can be irradiated to measured object from the utilizing emitted light of container cavity 22.The top of each LED 25 is towards the second opening 221 place, and the light beam that each LED 25 is sent is relative with the second opening 221, and the light beam sent to make LED 25 appears from the second opening 221 to greatest extent, thus improves the utilization ratio of luminous energy.In the present embodiment, LED 25 is 5, and the centre wavelength of these 5 LED 25 is respectively 260nm, 280nm, 300nm, 325nm and 355nm, and each LED 25 is all connected with microprocessor 24, and controls its closed and disconnected by microprocessor 24.Due on different measured object the pesticide variety that remains different, therefore different measured object is also different to the absorption of light source, and when after Closing Switch 3, these 5 LED 25 not all are opened, but open according to certain sequencing and be radiated on measured object.Particularly, after switch 3 is closed, all LED 25 are not opened, and photodetector 23 gathers spectrum spectrum as a setting; Then open the LED 25 of 260nm, gather spectroscopic data; Then close 260nmLED lamp 25, turn on 280nm lamp 25, gather spectroscopic data; Close 280nmLED lamp 25 again, turn on 300nmLED lamp 25, gather spectroscopic data; Then close 300nmLED lamp 25, turn on 325nmLED lamp 25, gather spectroscopic data; Close 325nmLED lamp 25 again, turn on 355nmLED lamp 25, gather spectroscopic data, complete the irradiation to a measured object and measurement.When measuring another different measured object, this process of circulation primary, completes one-shot measurement again.Certainly, in other embodiments, can according in measured object the difference of agricultural chemicals that remains, select the LED 25 of other wavelength, and the quantity of LED 25 is not limited to 5.In the present embodiment, owing to first have collected background spectrum data, and the impact of background spectrum (also i.e. the spectrum that sends of measured object itself) can be eliminated, make the measure spectrum of the agricultural chemicals on the measured object that records more accurate, improve the degree of accuracy of surveyed remains of pesticide.
Adopt LED 25 as light source, LED light source inherently has the effect of converging beam, and good stability, power consumption are lower.And each LED 25 is installed in spherical container cavity 22 inside equably, there is good even light effect, make measured object illumination more abundant, increase the reflected light of measured object and excite the fluorescence of generation, improving the measuring accuracy of microprocessor 24.
Photodetector 23 is arranged in spherical container cavity 22, photodetector 23 is fixed on the end of container cavity 22 away from the second opening 221 particularly, and photodetector 23 and the second opening 221 are oppositely arranged and point-blank, the light sent to make LED 25 is radiated at after on measured object through the second opening 221, the incident light of agricultural chemicals reflection residual on measured object is irradiated on this photodetector 23 with the fluorescence excited, and then the light signal that photodetector 23 is received is converted into electric signal.In the present embodiment, photodetector 23 is linear array detector, as line array CCD, linear array PDA or linear array CMOS etc., this photodetector 23 array has good spectral response between the ultraviolet-visible spectrum of 300-600nm, can to receive on measured object the residual incident light of agricultural chemicals reflection and the fluorescence of generation and be translated into electric signal.In other embodiments, photodetector 23 also can be arranged on outside spherical container cavity 22.
Gradual filter 26 is arranged on photodetector 23 on the light-sensitive surface of LED 25, and the light transmitting wavelength of this gradual filter 26 is 300-600nm, and this gradual filter 26 is consistent with the arrayed direction of photodetector 23 through wavelength gradual change direction.In the present embodiment, photodetector 23 adopts line array CCD, and model is TCD1304AP, and the length of photosensitive region is 30mm, gradual filter 26 is that plated film is formed on quartz glass, quartz glass is of a size of long 40mm, wide 8mm and thick 1mm, material is fused silica glass JGS1, this gradual filter 26 combinationally uses with photodetector 23, gradual filter 26 is sticked with glue on photodetector 23 surface, when receiving agricultural chemicals residual on the measured object incident light reflected and the fluorescence excited, due to the filter action of gradual filter 26, picture dots different on photodetector 23 can only receive the light of specific wavelength, and wavelength correspond to gradual filter 26 correspondence through wavelength, single exposure just can obtain spectrum, gradual filter is without the need to mechanical scanning or time scan.
Post lens 27 are arranged on the side of gradual filter 26 near LED 25, and fit tightly with gradual filter 26.And the generatrix direction of post lens 27 is consistent with the length direction of photodetector 23 array, play the effect of converging light, the incident light making agricultural chemicals reflection residual on measured object and the fluorescence excited converge on photodetector 23, increase the response sensitivity of photodetector 23.The material of post lens 27 be fused quartz or other can by the material of 300-600nm spectral range.Namely be radiated on described measured object after the light that LED 25 sends passes the second opening 221 and the first opening 211 successively, the incident light of agricultural chemicals reflection residual on measured object is irradiated on photodetector 23 through after post lens 27 and gradual filter 26 with the fluorescence excited successively, the light signal received is converted into electric signal by photodetector 23, then this electric signal is sent to microprocessor 24, after microprocessor 24 to receive on measured object the signal that residual agricultural chemicals sends, and carry out the residual quantity that computing obtains agricultural chemicals on measured object.
Microprocessor 24 is for receiving and processing the signal from photodetector 23, and microprocessor 24 is electrically connected with switch 3, LED 25 and photodetector 23 respectively, when after Closing Switch 3, battery 11 provides power supply that microprocessor 24 is started working for microprocessor 24, and then controls LED 25 and photodetector 23 synchronous working.Microprocessor 24 has control, calculates and memory function, and controlling functions realizes the synchronous working of LED 25 and photodetector 23, and after Closing Switch 3, microprocessor 24 records the wavelength of LED 25 light source and the data of photoelectric detector 23 collection simultaneously; Computing function realizes the calculating to photodetector 23 image data, thus obtains testing result; Memory function realizes the storage of known normal data and the storage of image data and measurement result, because often kind of agricultural chemicals can produce different fluorescence spectrums to different excitation wavelengths, and then have different fluorescence intensities, the known fluorescence data building database of ultraviolet wavelength and generation that excites is stored in microprocessor 24, thus can compares to the fluorescence spectrum of the agricultural chemicals that measured object remains.In the present embodiment, microprocessor 24 is electrically connected with each LED 25, and the model of microprocessor 24 is STM32F103.
Display screen 28 is electrically connected with microprocessor 24, and the testing result of measured object is detected for showing microprocessor 24, person easy to use directly reads testing result, and the residual quantity display by agricultural chemicals on the measured object that microprocessor 24 detects supplies user's reference on the display 28.Display screen 28 is arranged on shell 21 one end away from the first opening 211, and display screen 28 is arranged on the side of photodetector 23 away from LED 25.Particularly, display screen 28 is arranged on shell 21, and is arranged on the side of microprocessor 24 away from photodetector 23, to show the measurement result of microprocessor 24, and display screen 28 is fixed, rotatable or reversible, person easy to use directly reads testing result.Preferably, display screen 28 is LCDs.In the present embodiment, display testing result (i.e. the residual quantity of agricultural chemicals) is on the display 28 not the residual quantity representing concentration accurately, but a relative value relative to the national trace standard of pesticide.Different agricultural chemicals is due to its toxicity difference, not identical to the extent of injury of human body yet, therefore country is also different to the permission residue criterion of different agricultural chemicals, such as specify that the residual quantity of agricultural chemicals phosphorus ammonium must not higher than 0.1mg/Kg according to " People's Republic of China's agricultural chemicals management rules ", the residual quantity of pirimiphos-methyl must not higher than 5mg/Kg.On display screen 28, display is the relative value of the residual quantity of agricultural chemicals and the persticide residue of national Specification on measured object, namely microprocessor 24 calculates the difference of the persticide residue of agricultural chemicals residual on the measured object that detects and national Specification, microprocessor 24 to calculate on measured object according to this difference the percentage composition that residual agricultural chemicals exceedes national Specification further, and what namely show on the display 28 is the ratio of this difference and national Specification.And when the persticide residue of the persticide residue on measured object lower than national Specification, without any display on display bottle 28, illustrate that the persticide residue on this measured object meets national regulation, this measured object can relievedly use.In another embodiment, measurement section 2 also comprises an alarm (not shown), this alarm is connected with microprocessor 24, when detecting on measured object that residual agricultural chemicals can give the alarm when exceeding national Specification sound, exceeds standard to remind agricultural chemicals residual on this measured object of user.In order to estimate the number of agricultural chemicals superscale, the alarm sound of alarm can be set to batch (-type), and the time interval that persticide residue exceeds national Specification larger alarm sound is short, residual quantity exceed national Specification less time alarm sound time interval long, thus user can do a judgement roughly according to the residual quantity of alarm sound to agricultural chemicals.
In another embodiment, shell 21 is provided with data transmission interface 212, and this data transmission interface 212 is arranged on the below of display screen 28, to carry out exchanges data by data transmission interface 212 and external unit.
The measuring principle of this pesticide residue determination device is: current widely used agricultural chemicals is the agricultural chemicals such as carbamate, carbaryl, methacrifos mainly, and these agricultural chemicals can produce fluorescence spectrum under ultraviolet light or visible spectrum excite, the present invention adopts fluorescent spectrometry to detect the residual agricultural chemicals of measured object.During detection, press switch 3, and be placed on by measured object near the first opening 211 place, first microprocessor 24 gathers the data spectrum as a setting that LED 25 light source is not opened, then the LED 25 of different wave length is opened successively, the light source that LED 25 produces is successively through being radiated on measured object after the second opening 221 and the first opening 211, the fluorescence of the incident light spectrum that agricultural chemicals residual on measured object is launched and generation is irradiated on photodetector 23, and be transformed to after electric signal through photodetector 23 and pass to microprocessor 24, meanwhile this measure spectrum recorded by microprocessor 24, then this measure spectrum subtracting background spectrum to be on measured object adding of the residual incident light spectrum of agricultural chemicals reflection and the fluorescence spectrum of generation and, and then microprocessor 24 by self memory function comparison and calculate persticide residue, finally the display of this persticide residue is read for user on the display 28, the reference value that there is which kind of agricultural chemicals and persticide residue can be learnt in measured object.And when microprocessor 24 to detect in measured object that residual agricultural chemicals exceeds standard, alarm can give the alarm sound, to remind user that this persticide residue exceeds standard.
The pesticide residue determination device of the application, volume is little, lightweight, user's this pick-up unit hand-holdable is measured measured object, easy to operate; And without the need to preparing sample, can not damaging tested agricultural product, test period is short, only by this pick-up unit near measured object, need then press switch 3, just immediately can measure the persticide residue in measured object, the whole measuring process cycle is short; This pick-up unit is to tester without professional requirement, and the user being applicable to all age group uses, and is applicable to each places such as market, supermarket, the market of farm produce, easy to use; And owing to have employed the principle of fluorescence spectral measuring, can on-the-spot noncontact measured object and obtain measurement result in real time, and with the quick detection of persticide residue.
Another aspect of the present invention, additionally provide a kind of method detecting persticide residue, the method utilizes above-mentioned pesticide residue determination device to complete, this pesticide residue determination device comprises Handheld Division 1, measurement section 2 and switch 3, Handheld Division 1 is built with battery 11, measurement section 2 comprises shell 21, container cavity 22, photodetector 23, microprocessor 24, LED 25, gradual filter 26, post lens 27, display screen 28, window 29 and warning horn, particularly the annexation of Handheld Division 1 and measurement section 2 and respective inner structure described in detail in above-mentioned detection device embodiment, do not repeat them here.
The method detecting persticide residue comprises the following steps:
Prestore the spectroscopic data of common fruits and vegetables and agricultural chemicals in described microprocessor 24.Because the method that present invention employs Spectral matching carries out residue detection, therefore need before checkout equipment dispatches from the factory, in microprocessor 24, prestore the spectroscopic data of common fruits and vegetables and agricultural chemicals, and detected fruits and vegetables must be the fruits and vegetables types stored in pick-up unit.Be appreciated that after pick-up unit dispatches from the factory, also can carry out database upgrade to microprocessor 24, will the spectroscopic data of fruits and vegetables and the agricultural chemicals measured be needed to copy in microprocessor 24.
Hand-held above-mentioned pesticide residue determination device, makes its first opening 211 near measured object, and herein, measured object can be vegetables (green vegetables) or fruit (watermelon), and is the fruits and vegetables prestored in microprocessor 24;
Switch on power or make pick-up unit remain on duty, now two LED 25 send the light of its specific wavelength separately, and this two light beam, successively through after the second opening 221 and the first opening 211, is radiated near on the measured object of the first opening 211;
On the measured object of such as vegetables, if there is remains of pesticide on top layer, its fluorescent reflection be excited is passed on photodetector 23;
Photodetector 23 changes the light signal that measured object reflects into electric signal, and sends microprocessor 24 to and process;
Microprocessor 24 runs certain program, and to the result of the signal from photodetector 23, display on the display 28;
When detecting on measured object that residual agricultural chemicals exceeds national Specification, warning horn gives the alarm sound.
The method of this measurement persticide residue, the first hand-held pesticide residue determination device of user, and make the first opening 211 of described pesticide residue determination device near measured object, so that the optical energy irradiation making light source send is on measured object; Then Closing Switch 3, battery 11 is connected, and microprocessor 24 is started working, and controls LED 25 and photodetector 23 synchronous working; The light that LED 25 sends is successively through being radiated on measured object after the second opening 221 and the first opening 211, and the fluorescence transfer that agricultural chemicals residual on measured object excites is on photodetector 23.After the light signal of measured object is converted into electric signal by final photodetector 23, send microprocessor 24 to process, microprocessor 24 records the wavelength of LED 25 and the data of photodetector 23 collection simultaneously, microprocessor 24 is by self memory function comparison and the persticide residue calculated in measured object, and the persticide residue calculated is shown on the display 28, when detecting on measured object that residual agricultural chemicals exceeds national Specification, warning horn gives the alarm sound.Particularly, first, LED 15 is not opened, photodetector 23 gathers spectrum spectrum as a setting, this background spectrum is the spectroscopic data that fruits and vegetables itself send, it does not comprise the spectroscopic data of agricultural chemicals, then LED 25 is sequentially opened, gather a spectroscopic data (this spectroscopic data is the spectroscopic data sum that fruits and vegetables itself and agricultural chemicals send) again, and utilize this spectroscopic data subtracting background spectroscopic data, thus obtain the fluorescence data of pesticide residue, and the fluorescence spectrum this calculated compares with the agricultural chemicals spectroscopic data prestored and mates, concrete comprises spectral wavelength characteristic matching (identifying agricultural chemicals type) and spectral intensity coupling (detectable concentration), finally detect title and the roughly content of residues of pesticides, determine whether to exceed standard.
The method of measurement persticide residue of the present invention is simple, convenient, and user only needs this pick-up unit hand-held, and by pick-up unit near measured object, and then click switch 3 and can record persticide residue in measured object, the whole measuring process cycle is short; To tester without professional requirement, the user being applicable to all age group uses, and is applicable to each places such as market, supermarket, the market of farm produce, easy to use; The fruits and vegetables spectra database prestored eliminates the impact of fruits and vegetables self spectrum, improves the purity of fluorescence spectrum, ensures the accuracy that pesticide residue judges.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (10)
1. a pesticide residue determination device, comprise the Handheld Division (1) and measurement section (2) that are connected, it is characterized in that, described measurement section (2) comprising:
Shell (21), described shell (21) end is provided with the first opening (211), a spherical container cavity (22) is provided with in described shell (21), the wall position, chamber that described container cavity (22) is relative with described first opening (211) is provided with the second opening (221), and described container cavity (22) is communicated with described first opening (211) by the second opening (221);
Be arranged on the photodetector (23) in described spherical container cavity (22);
Receive and process the microprocessor (24) from described photodetector (23) signal;
Be arranged at least two LED on described container cavity (22) inwall or lasing light emitter (25), the light that described LED or lasing light emitter (25) send to be received by photodetector (23) through being radiated at the fluorescence that measured object makes described measured object excite after the second opening (221) and the first opening (211) and sending described microprocessor (24) process to successively.
2. pesticide residue determination device according to claim 1, is characterized in that, described LED (25) is narrow wave band ultraviolet LED lamp, and the centre wavelength of described LED (25) is between 260nm-360nm.
3. pesticide residue determination device according to claim 2, is characterized in that, the LED that centered by described at least two LED (25), wavelength is different or lasing light emitter.
4. pesticide residue determination device according to claim 2, it is characterized in that, each described LED or lasing light emitter (25) are installed in described container cavity (22) middle part also at grade respectively, and the light beam that each described LED or lasing light emitter (25) send is relative with described second opening (221).
5. pesticide residue determination device according to claim 1, it is characterized in that, described shell (21) is provided with display screen (28) away from one end of described first opening (211), described display screen (28) is arranged on the side of described photodetector (23) away from described LED (25), and described display screen (28) is electrically connected with described microprocessor (24) and testing result for showing described measured object.
6. according to the pesticide residue determination device in claim 1-5 described in any one, it is characterized in that, be embedded with window (29) in described second opening (221), described window (29) is made up of fused quartz.
7. according to the pesticide residue determination device in claim 1-5 described in any one, it is characterized in that, described photodetector (23) is provided with gradual filter (26) near described LED or lasing light emitter (25) light-sensitive surface, described gradual filter (26) be 300nm-600nm through wavelength.
8. pesticide residue determination device according to claim 7, is characterized in that, the side of the close described LED of described gradual filter (26) or lasing light emitter (25) is provided with the post lens (27) for optically focused.
9. pesticide residue determination device according to claim 7, is characterized in that, described microprocessor (24) is electrically connected with each described LED or lasing light emitter (25) and photodetector (23) respectively.
10. a pesticide residue determination method, uses pesticide residue determination device described in claim 1, it is characterized in that, comprise the following steps:
Prestore the spectroscopic data of common fruits and vegetables and agricultural chemicals in microprocessor (24);
Hand-held described pesticide residue determination device, makes its first opening (211) near measured object;
The light that described LED or lasing light emitter (25) send is successively through being radiated on described measured object after the second opening (221) and the first opening (211);
The fluorescence transfer that agricultural chemicals residual on described measured object excites is on photodetector (23);
Described photodetector (23) changes the light signal of described measured object into electric signal, and sends microprocessor (24) to and process;
The result of described microprocessor (24) is presented on display screen (28);
When detecting on measured object that residual agricultural chemicals exceeds national Specification, warning horn gives the alarm sound.
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| CN201410443153.3A CN105372215A (en) | 2014-09-02 | 2014-09-02 | Pesticide residue quantity detecting device and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770084A (en) * | 2016-11-23 | 2017-05-31 | 百奥森（江苏）食品安全科技有限公司 | A kind of vegetable pesticide residue detection means |
| CN107290285A (en) * | 2016-04-01 | 2017-10-24 | 王方明 | Spectrum fast detecting pesticide residue device and detection method |
| CN107703081A (en) * | 2017-11-10 | 2018-02-16 | 三锋集团有限公司 | A kind of lossless fast determining method of fruit and vegetable surfaces residues of pesticides |
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