CN102507401A - Simulated telemetry system and method for infrared extinction and particle size of bio-aerosol - Google Patents
Simulated telemetry system and method for infrared extinction and particle size of bio-aerosol Download PDFInfo
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- CN102507401A CN102507401A CN2011103490884A CN201110349088A CN102507401A CN 102507401 A CN102507401 A CN 102507401A CN 2011103490884 A CN2011103490884 A CN 2011103490884A CN 201110349088 A CN201110349088 A CN 201110349088A CN 102507401 A CN102507401 A CN 102507401A
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Abstract
The invention discloses a simulated telemetry system and a simulated telemetry method for infrared extinction and particle size of bio-aerosol. According to the system, an aerosol generator fills sample powder in a sample cell, the sample powder is fully dispersed by a fan to form a bio-aerosol cloud, the size distribution of particles is measured by a spectrometer, black body radiation generated by a large surface source black body radiation source positioned at a light inlet of the sample cell is used for simulating ground feature long wave radiation, and the light is attenuated by the sample cell, and is received by a medium field receiving telescope and a Fourier conversion infrared spectrometer which are positioned at the light outlet of the sample cell, so that the bio-aerosol cloud is subjected to infrared extinction measurement and telemetry simulation under typical ground feature backgrounds. The simulated telemetry system has a simple structure, is used for telemetry simulation of the spectrum extinction and size distribution of the aerosol under the laboratory conditions, and verifies a bio-aerosol infrared telemetry technology; and the invention is easy to operate, reliable and stable, and can simultaneously measure multiple components and multiple optical parameters.
Description
Technical field
The present invention relates to environment measuring technology and analysis and optical field, specifically refer to the emulation telemetry system and the method for infrared delustring of a kind of bioaerosol and particle diameter.
Background technology
Bioaerosol typically refers to particle diameter between 100nm～100 μ m, is suspended in to have active biological substance in the gas, comprises virus, bacterium, fungi, pollen and accessory substance thereof etc.In existing analytical approach, the measurement of bioaerosol is had relatively high expectations to sampling process.Traditional physics sampling of aerosol process is difficult to keep the biologically active of bioaerosol; Factors such as dehydration, UV radiation, temperature variation also make the sampling analysis of the bioaerosol more existing bioaerosol sample modes at present that have difficulties; Need through processes such as bump, collision, filtrations; Exist reappearance relatively poor, can only collect a small amount of life active compound, the overlapping defectives such as counting error that cause of bacterium colony.Therefore, in fact the metering system of traditional sampling is difficult to be applied to the real time on-line monitoring of bioaerosol.
Along with being showing improvement or progress day by day of optical technology, Fourier transform infrared spectroscopy (FTIR) telemetry has become a kind of good noncontact method for real-time measurement, in the gas remote measurement, has brought into play enormous function at present.It has highly sensitive and high-resolution characteristics, unique advantage such as can carry out that real-time polycomponent is surveyed simultaneously, and it all is widely used at aspects such as environment, chemistry, materials, in recent years in the application facet of the qualitative, quantitative monitoring of atmospheric pollution.All there is characteristic spectrum in most of bioaerosol at infrared band; Use infrared technique remote measurement bioaerosol cloud cluster; The loss of activity problem that not only can avoid sampling process to bring in theory; And can increase substantially analysis speed, making becomes possibility to the real time on-line monitoring of bioaerosol cloud cluster and the emergent remote measurement of burst Pollution accident.But; Because the bioaerosol cloud cluster is bigger in the single scattering albedo of infrared band; The signal that telemetry system receives not only comprises the absorption delustring on the measuring route, also comprises sky and the terrestrial radiation contribution of scatters on measuring route, can directly cause telemetry system to receive the signal background baseline fluctuation; And the common concentration of bioaerosol cloud cluster is lower, and its absorption cross section is less relatively.Receive the restriction of measuring condition; Can't realize the infrared delustring of bioaerosol and the synchro measure of particle size parameters under the field condition; Be difficult to obtain aerocolloidal optical characteristics comprehensively; Therefore bring difficulty for setting up its special-purpose method of telemetering, thereby limited the application of current method of infrared spectrophotometry remote measurement bioaerosol.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art; A kind of system and method for bioaerosol emulation remote measurement is provided; This invention has realized under the atural object far infrared surface feature background radiation of emulation; Bioaerosol is carried out the synchronous real-time measurement of non-destruction, polycomponent, many optical parameters, under the controlled condition of experiment condition, improved the completeness of measurement data.
Technical scheme of the present invention is following:
The emulation telemetry system of infrared delustring of a kind of bioaerosol and particle diameter; Comprise aerosol generator, sample cell, particle diameter spectrometer, big extend blackbody radiation source, receiving telescope and FTIS; It is characterized in that: the outlet of said aerosol generator links to each other with the injection port of sample cell through tracheae; The outlet of said sample cell links to each other with the particle diameter spectrometer through tracheae, is provided with fan in the described sample cell, and the bioaerosol sample that sprays from the outlet of aerosol generator gets into sample cell through tracheae; Under the purging effect of said fan; The bioaerosol sample spreads in sample cell, and gets into the particle diameter spectrometer through the outlet and the tracheae of sample cell, analyzes and measure the size distribution and the population concentration of bioaerosol sample;
The two ends of said sample cell are respectively equipped with into, light hole; The going into of described big extend blackbody radiation source, sample cell, light hole, receiving telescope and FTIS are positioned on the same light path; Said FTIS and particle diameter spectrometer insert computing machine altogether; Described big extend blackbody radiation source sends infrared radiating light, in the sample cell incidence hole gets into sample cell, and passes the bioaerosol sample in the sample cell; Again through the outgoing of sample cell light hole; After receiving by receiving telescope then, get into described FTIS, gather, analyze by the computer control FTIS at last and storage infrared spectral radiant data.
The emulation method of telemetering of infrared delustring of a kind of bioaerosol and particle diameter; It is characterized in that: it specifically may further comprise the steps: the bioaerosol sample is from the outlet ejection of aerosol generator; And charge in the sample cell through the injection port of tracheae through sample cell, under the purging of the gentle breeze that fan produces, the bioaerosol sample spreads in sample cell; And diffuse out through the outlet of sample cell; Get into the particle diameter spectrometer through tracheae, the particle diameter spectrometer carries out the quick real-time analysis, obtains the size distribution and the population change in concentration situation of bioaerosol sample; Simultaneously; From the infrared radiating light of big extend blackbody radiation source outgoing, in the sample cell incidence hole gets into sample cell, and pass the bioaerosol sample in the sample cell; Again through the outgoing of sample cell light hole; After being received by receiving telescope then, surveyed by FTIS, the infrared spectral radiant data that last computing machine measures according to FTIS and the size distribution and the population concentration of bioaerosol sample are carried out qualitative and quantitative analysis.
The emulation telemetry system of infrared delustring of described a kind of bioaerosol and particle diameter is characterized in that: described sample cell adopts transparent acrylic or organic glass material.
The emulation telemetry system of infrared delustring of described a kind of bioaerosol and particle diameter is characterized in that: the injection port of said sample cell is positioned at the middle part of sample cell sidewall, and the inboard 5cm of the height distance sample cell bottom surface of sample cell injection port.
The emulation telemetry system of infrared delustring of described a kind of bioaerosol and particle diameter; It is characterized in that: it is gasoloid that described aerosol generator is used for the bioaerosol sample diffusion; And the powder particle of reuniting is scatter, thereby form aerosol particle through the shearing force that forms at jet hole.
Described a kind of emulation telemetry system of measuring delustring of bioaerosol infrared spectrum and size distribution; It is characterized in that: high emissivity (> 98% is adopted on the surface of said big extend blackbody radiation source) material; The blackbody temperature of big extend blackbody radiation source work and is adjustable between-5 ℃ ~ 45 ℃.
The emulation telemetry system of infrared delustring of described a kind of bioaerosol and particle diameter; It is characterized in that: described particle diameter spectrometer is used for when gasoloid is taking place, carrying out the Real-time and Dynamic sampling; When analyzing distribution of gasoloid particle diameter and population concentration; From the population change in concentration trend that its sampling obtains, whether the spread condition of bioaerosol sample particle thing reaches steady state (SS) in the judgement sample pond.
The emulation method of telemetering of infrared delustring of described a kind of bioaerosol and particle diameter is characterized in that: what said Fourier transform infrared spectroscopy measured is total extinction spectra that infrared radiation obtains after bioaerosol absorption of sample and scattering process.
The emulation method of telemetering of infrared delustring of described a kind of bioaerosol and particle diameter is characterized in that: computing machine is carrying out quantitatively and in the process of qualitative analysis, is accomplishing the sampling and the measurement of distribution of gasoloid particle diameter and population concentration simultaneously.
Can realize on the infrared telemetry theoretical method bioaerosol composition of greater particle size is carried out the non-destruction passive measurement of polycomponent; But receive the restriction of measurement means; Owing to can't realize the infrared delustring of gasoloid and the synchro measure of particle size parameters under the field condition; Be difficult to obtain aerocolloidal optical characteristics comprehensively, therefore brought difficulty, thereby limited the application of current method of infrared spectrophotometry remote measurement bioaerosol for setting up its special-purpose method of telemetering.And the invention provides a kind of convenient valid approach, the experiment porch and the emulation mode that facilitate for the aerocolloidal infrared telemetry technology of biology.This system architecture is simple, and is easy to operate, the loss of activity problem that not only can avoid sampling process to bring, and can increase substantially analysis speed.These apparatus and method are through realizing synchronous and real-time measurement the to the many reference amounts of bioaerosol optical characteristics; Be used for the checking and the test of telemetry system and algorithm; Further widened existing infrared telemetry The Application of Technology field, the real-time monitoring of polluting for newtypes such as bioaerosols and the emergent remote measurement of unexpected incidents are laid a good foundation.
Beneficial effect of the present invention:
1, the present invention utilizes optical means directly to measure many reference amounts information such as the extinction spectra of bioaerosol, size distribution and number concentration, measuring method simple and fast;
2, the present invention's Non-Destructive Testing simultaneously mixed biologic gasoloid;
3, the present invention uses blackbody radiation emulation 800-1200cm
-1Atural object radiation spectrum characteristic, convenient and swift, reduced the implementation cost of outfield experiments, improved conventional efficient.
Description of drawings
Fig. 1 is a structure principle chart of the present invention.
Embodiment
Referring to Fig. 1; A kind of emulation telemetry system of measuring delustring of bioaerosol infrared spectrum and size distribution; Comprise aerosol generator 3, sample cell 6, particle diameter spectrometer 4, big extend blackbody radiation source 5, receiving telescope 2 and FTIS 1, the outlet of aerosol generator 3 links to each other for 8 mouthfuls with the sample introduction of sample cell 6 through tracheae, and the outlet 9 of sample cell 6 links to each other with particle diameter spectrometer 4 through tracheae; Be provided with fan 7 in the sample cell 6; Get into sample cell 6 from the bioaerosol sample of the outlet of aerosol generator 3 ejection through tracheae, under the purging effect of fan 7, the bioaerosol sample spreads in sample cell 6; And get into particle diameter spectrometer 4 through outlet of sample cell 69 and tracheae, analyze and measure the size distribution and the population concentration of bioaerosol sample;
The two ends of sample cell 6 are respectively equipped with into, light hole; The going into of big extend blackbody radiation source 5, sample cell 6, light hole, receiving telescope 2 and Fourier transform infrared spectroscopy 1 appearance are positioned on the same light path; FTIS 1 inserts computing machine altogether with particle diameter spectrometer 4; Big extend blackbody radiation source 5 sends infrared radiating light, in sample cell 6 incidence holes get into sample cell 6, and passes the bioaerosol sample in the sample cell 6; Again through sample cell 6 light hole outgoing; After receiving by receiving telescope 2 then, get into FTIS 1, gather, analyze by computer control FTIS 1 at last and storage infrared spectral radiant data.
A kind of emulation method of telemetering of measuring delustring of bioaerosol infrared spectrum and size distribution; Specifically may further comprise the steps: the bioaerosol sample is from the outlet ejection of aerosol generator; And charge in the sample cell through the injection port of tracheae through sample cell, under the purging of the gentle breeze that fan produces, the bioaerosol sample spreads in sample cell; And diffuse out through the outlet of sample cell; Get into the particle diameter spectrometer through tracheae, the particle diameter spectrometer carries out the quick real-time analysis, obtains the size distribution and the population change in concentration situation of bioaerosol sample; Simultaneously; From the infrared radiating light of big extend blackbody radiation source outgoing, in the sample cell incidence hole gets into sample cell, and pass the bioaerosol sample in the sample cell; Again through the outgoing of sample cell light hole; After being received by receiving telescope then, surveyed by FTIS, the infrared spectral radiant data that last computing machine measures according to FTIS and the size distribution and the population concentration of bioaerosol sample are carried out qualitative and quantitative analysis.
Sample cell 6 adopts transparent acrylic or organic glass material.
The injection port 8 of sample cell 6 is positioned at the middle part of sample cell 6 sidewalls, and the inboard 5cm in the height distance sample cell bottom surface of sample cell 6 injection ports 8.
It is gasoloid that aerosol generator 3 is used for the bioaerosol sample diffusion, and through the shearing force that forms at jet hole the powder particle of reuniting is scatter, thereby forms aerosol particle.
High emissivity (> 98% is adopted on the surface of big extend blackbody radiation source 5) material, the blackbody temperature of big extend blackbody radiation source 5 work and is adjustable between-5 ℃ ~ 45 ℃.
Particle diameter spectrometer 4 is used for when gasoloid is taking place, carrying out the Real-time and Dynamic sampling; When analyzing distribution of gasoloid particle diameter and population concentration; From the population change in concentration trend that its sampling obtains, whether the spread condition of bioaerosol sample particle thing reaches steady state (SS) in the judgement sample pond 6.
What Fourier transform infrared spectroscopy 1 measured is total extinction spectra that infrared radiation obtains after bioaerosol absorption of sample and scattering process.
Computing machine is carrying out quantitatively and in the process of qualitative analysis, is accomplishing the sampling and the measurement of distribution of gasoloid particle diameter and population concentration simultaneously.
In the present invention, the volume of sample cell 6 is 8L, and therefore choosing the vacuum pump extracting gases time is 2 minutes, and flow velocity is 32L/min, balance 1 minute, and it is stable to guarantee repeatedly to reflect pool gas, and measuring number of times is 16 times, and the measure spectrum time is 3 minutes.The field angle of receiving telescope 2 is 28mrad, and the aperture is 57mm.But big extend blackbody radiation source 5 steady operations are under various environment temperatures, and area is 300*300mm.The interface of aerosol generator 3 is according to the experiment needs, the polydispersed aerosol generator of can plugging into.The analyst coverage of particle diameter spectrometer 4 is 0.5-20 μ m.
The present invention is based on FTIS high precision, multiband, do not destroy advantages such as sample; In conjunction with size distribution and number apparatus for measuring concentration; Design a kind of bioaerosol infrared telemetry emulation test system and method, be specifically designed to the work such as optical characteristic measurement, telemetry simulation experiment and proof of algorithm of bioaerosol.The present invention helps expanding existing infrared telemetry The Application of Technology field, and the real-time monitoring of polluting for bioaerosol and the emergent remote measurement of unexpected incidents provide test macro and method.
Claims (9)
1. the emulation telemetry system of infrared delustring of bioaerosol and particle diameter; Comprise aerosol generator, sample cell, particle diameter spectrometer, big extend blackbody radiation source, receiving telescope and FTIS; It is characterized in that: the outlet of said aerosol generator links to each other with the injection port of sample cell through tracheae; The outlet of said sample cell links to each other with the particle diameter spectrometer through tracheae, is provided with fan in the described sample cell, and the bioaerosol sample that sprays from the outlet of aerosol generator gets into sample cell through tracheae; Under the purging effect of said fan; The bioaerosol sample spreads in sample cell, and gets into the particle diameter spectrometer through the outlet and the tracheae of sample cell, analyzes and measure the size distribution and the population concentration of bioaerosol sample;
The two ends of said sample cell are respectively equipped with into, light hole; The going into of described big extend blackbody radiation source, sample cell, light hole, receiving telescope and FTIS are positioned on the same light path; Said FTIS and particle diameter spectrometer insert computing machine altogether; Described big extend blackbody radiation source sends infrared radiating light, in the sample cell incidence hole gets into sample cell, and passes the bioaerosol sample in the sample cell; Again through the outgoing of sample cell light hole; After receiving by receiving telescope then, get into described FTIS, gather, analyze by the computer control FTIS at last and storage infrared spectral radiant data.
2. the emulation method of telemetering of infrared delustring of bioaerosol and particle diameter; It is characterized in that: it specifically may further comprise the steps: the bioaerosol sample is from the outlet ejection of aerosol generator; And charge in the sample cell through the injection port of tracheae through sample cell, under the purging of the gentle breeze that fan produces, the bioaerosol sample spreads in sample cell; And diffuse out through the outlet of sample cell; Get into the particle diameter spectrometer through tracheae, the particle diameter spectrometer carries out the quick real-time analysis, obtains the size distribution and the population change in concentration situation of bioaerosol sample; Simultaneously; From the infrared radiating light of big extend blackbody radiation source outgoing, in the sample cell incidence hole gets into sample cell, and pass the bioaerosol sample in the sample cell; Again through the outgoing of sample cell light hole; After being received by receiving telescope then, surveyed by FTIS, the infrared spectral radiant data that last computing machine measures according to FTIS and the size distribution and the population concentration of bioaerosol sample are carried out qualitative and quantitative analysis.
3. the emulation telemetry system of infrared delustring of a kind of bioaerosol according to claim 1 and particle diameter is characterized in that: described sample cell adopts transparent acrylic or organic glass material.
4. the emulation telemetry system of infrared delustring of a kind of bioaerosol according to claim 1 and particle diameter is characterized in that: the injection port of said sample cell is positioned at the middle part of sample cell sidewall, and the inboard 5cm in the height distance sample cell bottom surface of sample cell injection port.
5. the emulation telemetry system of infrared delustring of a kind of bioaerosol according to claim 1 and particle diameter; It is characterized in that: it is gasoloid that described aerosol generator is used for the bioaerosol sample diffusion; And the powder particle of reuniting is scatter, thereby form aerosol particle through the shearing force that forms at jet hole.
6. the emulation telemetry system of infrared delustring of a kind of bioaerosol according to claim 1 and particle diameter; It is characterized in that: high emissivity (> 98% is adopted on the surface of said big extend blackbody radiation source) material; The blackbody temperature of big extend blackbody radiation source work and is adjustable between-5 ℃ ~ 45 ℃.
7. the emulation telemetry system of infrared delustring of a kind of bioaerosol according to claim 1 and particle diameter; It is characterized in that: described particle diameter spectrometer is used for when gasoloid is taking place, carrying out the Real-time and Dynamic sampling; When analyzing distribution of gasoloid particle diameter and population concentration; From the population change in concentration trend that its sampling obtains, whether the spread condition of bioaerosol sample particle thing reaches steady state (SS) in the judgement sample pond.
8. the emulation method of telemetering of infrared delustring of a kind of bioaerosol according to claim 2 and particle diameter is characterized in that: what said Fourier transform infrared spectroscopy measured is total extinction spectra that infrared radiation obtains after bioaerosol absorption of sample and scattering process.
9. the emulation method of telemetering of infrared delustring of a kind of bioaerosol according to claim 2 and particle diameter is characterized in that: computing machine is carrying out quantitatively and in the process of qualitative analysis, is accomplishing the sampling and the measurement of distribution of gasoloid particle diameter and population concentration simultaneously.
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Cited By (4)
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| CN102967577A (en) * | 2012-10-18 | 2013-03-13 | 中国人民解放军电子工程学院 | Biological aerosol transmitance testing arrangement based on Fourier transform infrared spectrometer |
| CN108254331A (en) * | 2018-04-24 | 2018-07-06 | 中国科学院合肥物质科学研究院 | A kind of new infrared spectrometer |
| CN110118711A (en) * | 2019-06-11 | 2019-08-13 | 江苏钛科圈物联网科技有限公司 | Room air bacteria containing amount real-time detection and analysis method, system based on Internet of Things |
| CN114460027A (en) * | 2021-12-30 | 2022-05-10 | 中船重工安谱（湖北）仪器有限公司 | System and method for detecting area of trace substance by FTIR spectrometer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967577A (en) * | 2012-10-18 | 2013-03-13 | 中国人民解放军电子工程学院 | Biological aerosol transmitance testing arrangement based on Fourier transform infrared spectrometer |
| CN102967577B (en) * | 2012-10-18 | 2015-04-22 | 中国人民解放军电子工程学院 | Biological aerosol transmitance testing arrangement based on Fourier transform infrared spectrometer |
| CN108254331A (en) * | 2018-04-24 | 2018-07-06 | 中国科学院合肥物质科学研究院 | A kind of new infrared spectrometer |
| CN110118711A (en) * | 2019-06-11 | 2019-08-13 | 江苏钛科圈物联网科技有限公司 | Room air bacteria containing amount real-time detection and analysis method, system based on Internet of Things |
| CN110118711B (en) * | 2019-06-11 | 2019-12-31 | 江苏钛科圈物联网科技有限公司 | Indoor air bacteria content real-time detection and analysis method and system based on Internet of things |
| CN114460027A (en) * | 2021-12-30 | 2022-05-10 | 中船重工安谱（湖北）仪器有限公司 | System and method for detecting area of trace substance by FTIR spectrometer |
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Application publication date: 20120620 |