CN105891416A - Ultrasonic assisting high-sensitivity detection system for pollutants in fluid and working method of ultrasonic assisting high-sensitivity detection system - Google Patents
Ultrasonic assisting high-sensitivity detection system for pollutants in fluid and working method of ultrasonic assisting high-sensitivity detection system Download PDFInfo
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- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 65
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 65
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 239000012530 fluid Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000005855 radiation Effects 0.000 claims abstract description 54
- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 230000010365 information processing Effects 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000003287 optical effect Effects 0.000 claims description 36
- 230000035945 sensitivity Effects 0.000 claims description 26
- 239000011859 microparticle Substances 0.000 claims description 15
- 230000000694 effects Effects 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims 1
- 239000010419 fine particle Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 3
- 239000000809 air pollutant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000026683 transduction Effects 0.000 description 2
- 238000010361 transduction Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000012491 analyte Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000003403 water pollutant Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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Abstract
The invention discloses an ultrasonic assisting high-sensitivity detection system for pollutants in fluid and a working method of the ultrasonic assisting high-sensitivity detection system. The ultrasonic assisting high-sensitivity detection system comprises an ultrasonic transducer. The ultrasonic transducer is provided with electrodes, an acoustic radiation plate is fixedly arranged on the surface of the ultrasonic transducer, a reflection plate is arranged below the acoustic radiation plate, a radiation layer is formed between the acoustic radiation plate and the reflection plate, and a sensor is arranged at the radiation layer and connected with a computer through a signal processing conversion device. A laser irradiation device and a transmission light receiving device are symmetrically arranged on the left side and the right side outside the radiation layer, and a scattered light receiving device is arranged in the front of the radiation layer or on the back of the radiation layer. The laser irradiation device, the transmission light receiving device and the scattered light receiving device are connected with a control and information processing system. The system utilizes acoustic flow, acoustic radiation pressure and acoustic vibration produced by resonance of the ultrasonic transducer and can not damage components of the pollutants, the detection precision of the sensor and a laser fine particle detection device can be improved exponentially, cost is greatly reduced, and the detection precision is greatly improved.
Description
Technical field
The present invention relates to a kind of ultrasonic wave added pollutant from fluid high sensitivity detecting system and method for work thereof, particularly relate to a kind of based on super
Pollutant principle is assembled in the ultrasonic vibration of sonic transducer and the acoustics stream of generation and acoustic radiation force thereof, belongs to applications of ultrasound field.
Background technology
Along with industrial and agricultural development and motor vehicles increase, air pollutes the most serious with water.Air and water pollutant kind are complicated, contain
Heavy metal, bacterium, respirable dust, agricultural chemicals and antibiotic etc..The quickest, the economic various pollutant component of detection becomes an environment
A difficult problem in improvement, in the urgent need to a kind of high efficiency, low cost, easily realization and free of contamination detection method.
At present, mature pollutant monitoring sensor has semiconductor, electrochemistry, optics etc., and wherein the semiconductor transducer life-span is long, valency
Lattice are cheap, but uniformity is poor, low precision.Electrochemical sensor precision is general, and the life-span is short.Optical pickocff precision is high, but expensive.
Generally, the sensor price that precision is the highest is the highest, and is to be doubled and redoubled.
Therefore, a kind of new performance of sensor that do not changes own but can improve the technology of whole system sensitivity and promotes for detection technique, reduces
Testing cost has extremely important meaning.
Summary of the invention
The technical problem to be solved is to provide a kind of ultrasonic wave added pollutant from fluid high sensitivity detecting system, and this system utilizes super
Acoustic wave transducer resonance and produce acoustics stream and acoustic radiation pressure, pollutant component will not be destroyed, sensor can be significantly improved and laser is micro-
Fine grained detection device accuracy of detection, is greatly reduced the cost improving accuracy of detection.
Present invention also offers the method for work of this ultrasonic wave added pollutant from fluid high sensitivity detecting system.
A kind of ultrasonic wave added pollutant from fluid high sensitivity detecting system of the present invention, including ultrasonic transducer, acoustic radiation plate, reflection
Plate, sensor, signal transacting conversion equipment, computer, laser receiver, laser radiation device and control and information processing system；
Described ultrasonic transducer is provided with the electrode that can apply driving voltage, is fixed with for increasing vibrator scope at surface of ultrasonic transducer
Acoustic radiation plate, the lower section of acoustic radiation plate is provided with the reflecting plate for reflecting sound wave, forms radiating layer between acoustic radiation plate and reflecting plate,
Being provided with the sensor for detecting pollutant at radiating layer, sensor is connected with computer by signal transacting conversion equipment；At radiating layer
Being arranged with laser radiation device and transmission optical pickup apparatus at the outer left and right sides, the front or behind at radiating layer is provided with scattered light and receives dress
Put；Laser radiation device, transmission optical pickup apparatus and scattering optical pickup apparatus are all connected with control and information processing system, by controlling
And information processing system receives signal, calculating processes and preserves data.
Improving further, described ultrasonic transducer is sandwich or SMD structure, and vibrator position is in the middle position of acoustic radiation plate or non-
Middle position.
Improving further, described acoustic radiation plate is circular, rectangle or dome shape.
Improve further, described radiating layer height be 0～10 λ, λ be the wavelength of work sound field.
Improve further, be arranged in parallel or angled setting between described acoustic radiation plate and reflecting plate.
Improving further, it is different and change, sensing station distribution that the kind of described sensor detects pollutant kind as required with quantity
In congregational rate strength.
Improving further, described sensor is single or multiple, detects multiple pollutant simultaneously.
The method of work of a kind of ultrasonic wave added pollutant from fluid high sensitivity detecting system, comprises the following steps:
1) by ultrasonic transducer support fixed placement in detected fluid environment；
2) electrode being applied excitation, ultrasonic transducer can produce and encourage same frequency to vibrate, and transmits this vibration by acoustic radiation plate, in radiation
Producing sound field in Ceng, the pollutant in radiating layer is subject to the acoustics stream effect produced by sound field move and assemble in FX；
3) when detecting actual pollutant levels, acoustics flowing or acoustic vibration effect strong position detection pollutant are placed a sensor at,
Then, signal transacting conversion equipment gathers the induced signal in sensor and converts a signal into the identified signal of computer, passes to calculate
Machine, finally, computer is according to correspondence position pollutant monitoring concentration in ultrasonic field and actual pollutant levels ratio formula ρ=ρ0/k
Calculating actual pollutant levels and show result, in formula, ρ is actual concentrations, ρ0For detectable concentration, k is detectable concentration and actual concentrations
Ratio；Coefficient k correction with determine, be the gaseous sample of n for pollutant levels, such as the output voltage of sensor that sensitivity is S
For V, then k=SV/n, given exciting condition, k value is constant；
4) when detecting microparticle concentration, laser beam emitting device is placed in it and launches laser and may pass through the radiating layer side of sound field pitch plane
Position, arranges transmission optical pickup apparatus in the side that laser beam emitting device is corresponding, and the front or behind at radiating layer is provided with scattered light and receives dress
Putting, then, control and information processing system control laser beam emitting device sends laser and passes sound field pitch plane, laser runs into sound field pitch plane
On microparticle after scatter, transmission light and scattered light propagate to respectively transmission optical pickup apparatus and scattering optical pickup apparatus, transmission light connects
Receiving apparatus and scattering optical pickup apparatus receive data re-transmission after transmission light and scattered light respectively to controlling and information processing system, control and
Information processing system carries out processing data, calculates microparticle concentration according to scattered light or transmitted intensity and goniometer and is distributed with particle diameter, then root
Calculating actual microparticle concentration according to reduction formula, computing formula is ibid.
The operation principle of the present invention is:
First, applying driving voltage on described ultrasonic transducer, ultrasonic transducer produces resonance, drives the resonance of acoustic radiation plate, in acoustically radiating
Penetrate formation ultrasonic field between plate and reflecting plate, utilize the vibration in ultrasonic field and acoustics stream, drive pollutant from fluid particle to examine to sensor
Survey region clustering, strengthen detection output signal, thus improve system sensitivity, then draw air through signal transacting and computer conversion process
Middle actual pollutant levels；Then, ultrasonic transducer applying driving voltage, ultrasonic transducer produces resonance, drives the resonance of acoustic radiation plate,
Between acoustic radiation plate and reflecting plate, form ultrasonic field, utilize acoustic radiation force to make subparticle collect around at sound field pitch plane, swash during detection
Light passes sound field pitch plane near zone, strengthens detection output signal, thus strengthens laser fine grain testing apparatus sensitivity.
The beneficial effects of the present invention is:
Ultrasonic wave added pollutant from fluid high sensitivity detecting system of the present invention is being changed without sensor and is not improving laser detector spirit
Under conditions of sensitivity, the acoustics stream, acoustic radiation force and the acoustics vibratory drive pollutant that utilize ultrasonic transducer vibration to produce gather to FX
Collection, improves system accuracy of detection；The acoustic radiation force that this system is produced by ultrasonic transducer resonance makes subparticle near sound field pitch plane
Assemble, strengthen laser fine grain testing apparatus detection region subparticle concentration, improve laser fine grain testing apparatus sensitivity；This is
System utilizes acoustics stream, acoustic radiation pressure and the acoustic vibration that ultrasonic transducer resonance produces, and will not destroy pollutant from fluid composition；The present invention
Apparatus structure the most easily realizes, noiselessness, Miniaturizable, good reliability.
Accompanying drawing explanation
Fig. 1 is the operating diagram of the embodiment of the present invention 1；
Fig. 2 is the operating diagram of the embodiment of the present invention 2.
Wherein: 1. ultrasonic transducer 2. electrode 3. acoustic radiation plate 4. radiating layer 5. reflecting plate 6. sensor 7. chromacoder 8. calculates
Machine 9. laser beam emitting device 10. transmission optical pickup apparatus 11. controls and information processing system 12. sound field pitch plane 13. scattered light receives dress
Put
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings:
As shown in Figure 1-2, a kind of ultrasonic wave added air pollutants high sensitivity detecting system, concrete structure is as follows, including ultrasonic transducer 1,
Acoustic radiation plate 3, reflecting plate 5, sensor 6, signal transacting conversion equipment 7, computer 8, laser radiation device 9, transmission light-receiving fill
Put 10, control and information processing system 11 and scattering optical pickup apparatus 13；Described ultrasonic transducer 1 is provided with and can apply excitation electricity
The electrode 2 of pressure, is fixed with the acoustic radiation plate for amplifying vibrator at surface of ultrasonic transducer, and the lower section of acoustic radiation plate is provided with for reflecting
The reflecting plate 5 of sound wave, forms radiating layer 4 between acoustic radiation plate 3 and reflecting plate 5, is provided with the biography for detecting pollutant at radiating layer
Sensor 6, sensor 6 is connected with computer 8 by signal transacting conversion equipment 7；It is arranged with sharp at radiating layer 4 the right and left
Light radiological unit 9 and transmission optical pickup apparatus 10；Front or behind at radiating layer also is provided with scattering optical pickup apparatus 13；Laser radiation fills
Put 9, transmission optical pickup apparatus 10 and scattering optical pickup apparatus 13 all with control and information processing system 11 is connected, by control and believe
Breath processing system receives signal, and calculating processes and preserves data；Wherein, control and information processing system is to laser signal reception, calculates
The summary of the total system process, preserved.
The method of work of a kind of ultrasonic wave added pollutant from fluid high sensitivity detecting system, comprises the following steps:
1) by ultrasonic transducer by support fixed placement in fluid environment；
2) electrode being applied excitation, ultrasonic transducer can produce and encourage same frequency to vibrate, and is amplified by acoustic radiation plate and transmits this vibration,
Producing sound field in radiating layer, the pollutant in radiating layer is subject to the acoustics stream effect produced by sound field move and assemble in FX；
3) when detecting actual pollutant levels, acoustics flowing or acoustic vibration effect strong position detection pollutant are placed a sensor at,
Then, signal transacting conversion equipment gathers the induced signal in sensor and converts a signal into the identified signal of computer, passes to calculate
Machine, finally, computer is according to correspondence position pollutant monitoring concentration in ultrasonic field and actual pollutant levels ratio formula ρ=ρ0/k
Calculating actual pollutant levels and show result, in formula, ρ is actual concentrations, ρ0For detectable concentration, k is detectable concentration and actual concentrations
Ratio；Coefficient k correction with determine, be the gaseous sample of n for pollutant levels, such as the output voltage of sensor that sensitivity is S
For V, then k=SV/n, given exciting condition, k value is constant；
4) when detecting microparticle concentration, laser beam emitting device is placed in it and launches laser and may pass through the radiating layer side of sound field pitch plane
Position, arranges transmission optical pickup apparatus in the side that laser beam emitting device is corresponding, and the front or behind at radiating layer is provided with scattered light and receives dress
Putting, then, control and information processing system control laser beam emitting device sends laser and passes sound field pitch plane, laser runs into sound field pitch plane
On microparticle after scatter, transmission light and scattered light propagate to respectively transmission optical pickup apparatus and scattering optical pickup apparatus, transmission light connects
Receiving apparatus and scattering optical pickup apparatus receive data re-transmission after transmission light and scattered light respectively to controlling and information processing system, control and
Information processing system carries out processing data, calculates microparticle concentration according to scattered light intensity and goniometer, calculates further according to reduction formula
Actual microparticle concentration, computing formula is ibid.
Embodiment 1:
With reference to Fig. 1, by ultrasonic transducer 1 use support fixed placement in air ambient, when electrode 2 is applied excitation, ultrasonic transduction
Device 1 can produce and encourage same frequency to vibrate, and is amplified by acoustic radiation plate 3 and transmits this vibration, producing sound field, radiation in radiating layer 4
Pollutant in Ceng is moved by by acoustics stream and the acoustics effect of vibration of sound field and generation thereof, assembles in FX, and sensor 6 is put
Putting and detect pollutant at acoustics stream and acoustics vibrating effect strong position, then, signal transacting conversion equipment 7 gathers the sense in sensor 6
Induction signal also converts a signal into the identified signal of computer, passes to computer 8, and finally, computer 8 is according to position corresponding in ultrasonic field
Put pollutant monitoring concentration and actual pollutant levels ratio public affairs ρ=ρ0/ k formula calculates actual pollutant levels and shows result；
In ratio formula, ρ is actual concentrations, ρ0For detectable concentration, k is detectable concentration and actual concentrations ratio, and k is that detectable concentration is dense with reality
Degree ratio；In coefficient k is corrected and determined, being the gaseous sample of n for pollutant levels, the output such as the sensor that sensitivity is S is electric
Pressure is V, then k=SV/n, and given driving frequency, amplitude and radiating layer size, k value is constant；Such as, when excited frequency 56kHz,
Sensor and transducer distance 6mm, during sensor correspondence transducer middle position, k value is 6, records certain pollutant load in air and is
0.48mg/m3, its actual content 0.48/6=0.08mg/m3。
Embodiment 2:
With reference to Fig. 2, by ultrasonic transducer 1 use support fixed placement in air ambient, when electrode 2 is applied excitation, ultrasonic transduction
Device 1 can produce and encourage same frequency to vibrate, and is amplified by acoustic radiation plate 3 and transmits this vibration, produces sound field and formed in radiating layer 4
Sound field pitch plane 12, in radiating layer 4, subparticle collects around at sound field pitch plane 12 under acoustic radiation force effect, then by Laser emission
Device 9 is placed in it and launches the position that laser may pass through radiating layer 4 side of sound field pitch plane 12, in the side of laser beam emitting device 9 correspondence
Arranging transmission optical pickup apparatus 10, the front or behind at radiating layer arranges scattering optical pickup apparatus 13, then, controls and information processing system
System 11 control laser beam emitting device 9 sends laser and passes sound field pitch plane 12, and laser occurs after running into the microparticle on sound field pitch plane 12
Scattering, produces scattered light, and the laser through radiating layer forms transmission light, the subparticle that pitch plane collects around, and can weaken transmission light
Intensity, transmission light and scattered light propagate to transmission optical pickup apparatus 10 and scattering optical pickup apparatus 13, transmission optical pickup apparatus 10 He respectively
Data re-transmission is extremely controlled and information processing system 11 after receiving transmission light and scattered light respectively by scattering optical pickup apparatus 13, controls and believes
Breath processing system 11 carries out processing data, calculates microparticle concentration according to scattered light or transmitted intensity, calculates further according to reduction formula
Going out actual microparticle concentration, ibid, when excited frequency 43kHz, when radiant panel and reflecting plate distance 5mm, laser passes computing formula
Pitch plane, k value is 8, and recording air PM10 content is 14 μ g/m3Time, its actual content is 14/8=1.75 μ g/m3。
When transducer drive frequency, voltage, structure and acoustic radiation Board position, quantity, alteration of form, the acoustics produced in radiating layer
Stream can change with acoustic radiation force, and the pollutant kind of gathering, quantity and position can occur respective change, now change sensor type,
Change sensor and laser fine grain testing apparatus putting position can measure different pollutant parameter；Above method is useful for different rings
Border, different pollutant kind use；Native system can be used for a small amount of pollutant monitoring such as laboratory it can also be used to the large space such as open air, factory
Air pollution analyte detection, native system can also be used for detecting liquid and neutralizes the pollutant levels in other gases.
The above is only the preferred embodiment of the present invention, it is noted that for those skilled in the art, not
On the premise of departing from the principle of the invention, it is also possible to making some improvement, these improvement also should be regarded as protection scope of the present invention.
Claims (8)
1. a ultrasonic wave added pollutant from fluid high sensitivity detecting system, it is characterised in that: include ultrasonic transducer, acoustic radiation plate, reflecting plate, sensor, signal transacting conversion equipment, computer, laser radiation device, transmission optical pickup apparatus, scattering optical pickup apparatus and control and information processing system；Described ultrasonic transducer is provided with the electrode that can apply driving voltage, it is fixed with the acoustic radiation plate for increasing vibrator scope at surface of ultrasonic transducer, the lower section of acoustic radiation plate is provided with the reflecting plate for reflecting sound wave, radiating layer is formed between acoustic radiation plate and reflecting plate, being provided with the sensor for detecting pollutant at radiating layer, sensor is connected with computer by signal transacting conversion equipment；Being arranged with laser radiation device and transmission optical pickup apparatus at the outer left and right sides of radiating layer, the front or behind at radiating layer is provided with scattering optical pickup apparatus；Laser radiation device, transmission optical pickup apparatus and scattering optical pickup apparatus are all connected with control and information processing system, and by controlling and information processing system reception signal, calculating processes and preserves data.
Ultrasonic wave added pollutant from fluid high sensitivity detecting system the most according to claim 1, it is characterised in that: described ultrasonic transducer is sandwich or SMD structure.
Ultrasonic wave added pollutant from fluid high sensitivity detecting system the most according to claim 1, it is characterised in that: described acoustic radiation plate is circular, rectangle or dome shape.
Ultrasonic wave added pollutant from fluid high sensitivity detecting system the most according to claim 1, it is characterised in that: described radiating layer height be 0～10 λ, λ be the wavelength of work sound field.
Ultrasonic wave added pollutant from fluid high sensitivity detecting system the most according to claim 1, it is characterised in that: it be arranged in parallel or angled setting between described acoustic radiation plate and reflecting plate.
Ultrasonic wave added pollutant from fluid high sensitivity detecting system the most according to claim 1, it is characterized in that: it is different and change that the kind of described sensor detects pollutant kind as required with quantity, and sensing station is distributed in congregational rate strength or acoustics stream effect strength.
Ultrasonic wave added pollutant from fluid high sensitivity detecting system the most according to claim 1, it is characterised in that: described sensor is single or multiple.
8. the method for work of the ultrasonic wave added pollutant from fluid high sensitivity detecting system as described in claim 1-7, it is characterised in that: comprise the following steps:
1) by ultrasonic transducer by support fixed placement in fluid environment；
2) electrode is applied excitation, ultrasonic transducer can produce and encourage same frequency to vibrate, transmitting this vibration by acoustic radiation plate, produce sound field in radiating layer, the pollutant in radiating layer is subject to the acoustics stream effect produced by sound field move and assemble in FX；
3) when detecting actual pollutant levels, place a sensor at acoustics flowing or acoustic vibration effect strong position detection pollutant, then, signal transacting conversion equipment gathers the induced signal in sensor and converts a signal into the identified signal of computer, pass to computer, finally, computer pollutes ρ=ρ according to correspondence position pollutant monitoring concentration in ultrasonic field with actual0/ k substrate concentration ratio formula calculates actual pollutant levels and shows result, and in formula, ρ is actual concentrations, ρ0For detectable concentration, k is detectable concentration and actual concentrations ratio；In coefficient k correction and determining, being the gaseous sample of n for pollutant levels, if the output voltage of the sensor that sensitivity is S is V, then k=SV/n, given exciting condition, k value is constant；
null4) when detecting microparticle concentration，Laser beam emitting device is placed in it and launches the position that laser may pass through the radiating layer side of sound field pitch plane，In the side that laser beam emitting device is corresponding, transmission optical pickup apparatus is set，Front or behind at radiating layer is provided with scattering optical pickup apparatus，Then，Control and information processing system controls laser beam emitting device and sends laser through sound field pitch plane，Laser scatters after running into the microparticle on sound field pitch plane，Transmission light and scattered light propagate to transmission optical pickup apparatus and scattering optical pickup apparatus respectively，Data re-transmission is extremely controlled and information processing system after receiving transmission light and scattered light respectively by transmission optical pickup apparatus and scattering optical pickup apparatus，Control and information processing system carries out processing data，Microparticle concentration is calculated according to scattered light intensity and goniometer，Actual microparticle concentration is calculated further according to reduction formula，Computing formula is ibid.
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Cited By (7)
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| CN107315070A (en) * | 2017-07-05 | 2017-11-03 | 南京航空航天大学 | A kind of structure of ultrasonic wave added type MOS gas sensors |
| CN108096985A (en) * | 2017-12-14 | 2018-06-01 | 南京航空航天大学 | A kind of ultrasonic wave added gas concentration unit and its method of work |
| CN108693246A (en) * | 2018-07-10 | 2018-10-23 | 南京航空航天大学 | A kind of structure of ultrasound bulk acoustic wave gas sensing device |
| CN110726678A (en) * | 2019-11-28 | 2020-01-24 | 浙江农林大学 | Turbidity detection device of city river water |
| CN110865120A (en) * | 2019-11-28 | 2020-03-06 | 浙江农林大学 | City river ecological intelligent monitoring master station |
| CN112639438A (en) * | 2018-06-21 | 2021-04-09 | 通快光电器件有限公司 | Laser sensor module indicating readiness for use |
| CN114535091A (en) * | 2021-12-15 | 2022-05-27 | 中国科学院深圳先进技术研究院 | Particle sorting method based on sound artificial structure |
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| CN108096985A (en) * | 2017-12-14 | 2018-06-01 | 南京航空航天大学 | A kind of ultrasonic wave added gas concentration unit and its method of work |
| CN112639438A (en) * | 2018-06-21 | 2021-04-09 | 通快光电器件有限公司 | Laser sensor module indicating readiness for use |
| CN108693246A (en) * | 2018-07-10 | 2018-10-23 | 南京航空航天大学 | A kind of structure of ultrasound bulk acoustic wave gas sensing device |
| CN108693246B (en) * | 2018-07-10 | 2024-03-29 | 南京航空航天大学 | Structure of ultrasonic bulk acoustic wave gas sensing device |
| CN110726678A (en) * | 2019-11-28 | 2020-01-24 | 浙江农林大学 | Turbidity detection device of city river water |
| CN110865120A (en) * | 2019-11-28 | 2020-03-06 | 浙江农林大学 | City river ecological intelligent monitoring master station |
| CN114535091A (en) * | 2021-12-15 | 2022-05-27 | 中国科学院深圳先进技术研究院 | Particle sorting method based on sound artificial structure |
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