CN104181228B - Method capable of accelerating response of trace gas integrated detector - Google Patents
Method capable of accelerating response of trace gas integrated detector Download PDFInfo
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- CN104181228B CN104181228B CN201410476582.0A CN201410476582A CN104181228B CN 104181228 B CN104181228 B CN 104181228B CN 201410476582 A CN201410476582 A CN 201410476582A CN 104181228 B CN104181228 B CN 104181228B
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Abstract
The invention discloses a method capable of accelerating the response of a trace gas integrated detector. A gas circuit device comprises a main gas circuit formed by sequentially connecting an enrichment device connected with a gas inlet, a gas sensor and a first gas pump; a first branch gas circuit is connected with the output end of the enrichment device by a three-way valve; a second branch gas circuit turns around the enrichment device by a three-way valve or a three-way joint, and the gas sensor is directly connected with the gas inlet; when enrichment and real-time detection are implemented at the same time, the three-way valves are controlled to be switched on, part of the gas is discharged by the first branch gas circuit after being enriched by the enrichment device through the gas inlet, and the other part of the gas is directly pumped into the gas sensor through the branch gas circuits from the gas inlet so as to be detected; when detection is carried out after enrichment, the first branch gas circuit and the second branch gas circuit are switched off by controlling the three-way valves, the enrichment device is heated, and the enriched gas is introduced into the gas sensor so as to be detected; after the detection, the enrichment device is stopped being heated and is cooled to the initial temperature, so that the rapid response to the trace gas can be further realized.
Description
Technical field
The present invention relates to gas sensor/detector technology field, more particularly, to a kind of quickening integrated detection of trace gas
The method of device response.
Background technology
When detecting to the trace gas in complex environment, there is such a technical barrier：Due to detection
Gas concentration is very low, the detection threshold needed for sensitivity difficult to reach of existing sensor, therefore increases in the front end of sensor
Enriching apparatus become an effective way solving transducer sensitivity deficiency.Enricher and high-sensitive gas sensor are constituted
Most basic trace gas integrated detector.
For Trace gas detection, generally require to be enriched with for a long time to gather enough gas molecules, and in subsequent solution
These adsorbed gases of quick release in adsorption process, to obtain the gas concentration higher than sensor detection threshold.Obviously, gas to be measured
The concentration of body is lower, needs the time of enrichment longer.But, long-time enrichment undoubtedly weakens the real-time of sensor detected gas
Property.When being detected especially for the high-risk gas such as poisonous, inflammable and explosive, can be to the higher concentration fatal risk having occurred
Gas postpones response（Report to the police）, lead to integrated detector to lose important real-time response characteristic.In short, existing technology exists
Such a contradiction：The gas detecting of low concentration needs in the integrated enricher in the front end of sensor, but after integrated enricher again
The response time for high concentrations of gas for the sensor can greatly be extended.
Therefore, there is the slow technical problem of gas integrated detector response speed in prior art.
Content of the invention
The embodiment of the present invention is passed through to provide a kind of method accelerating the response of trace gas integrated detector, solves existing skill
There is the slow technical problem of gas integrated detector response speed in art, and then achieve and can quickly trace gas be rung
The technique effect answered.
Embodiments provide a kind of inclusion be connected to the enricher of air inlet, gas sensor, the first air pump according to
Secondary connection forms main gas circuit, also includes：
First gas circuit is connected to by enricher outfan by three-way valve；
Second gas circuit is bypassed directly by gas sensor and air inlet by enricher by three-way valve or threeway adaptor
It is connected；
Wherein, when enrichment and examinations work simultaneously, control and open three-way valve, a gas part is passed through by air inlet
After enricher enrichment, tail gas is discharged by first gas circuit, and gas another part is passed directly into gas by air inlet by the second gas circuit
Body sensor is detected；
When being detected after enrichment, close first gas circuit by controlling three-way valve, close second gas circuit, heating is rich
Storage, is passed through gas sensor to the gas after enrichment and detects；
After the completion of detection, stop heating and being allowed to cool to initial temperature to enricher.
Further, at air inlet, enricher air inlet and second gas circuit air inlet are connected respectively by threeway adaptor
Mouthful.
Further, connect the second air pump in first gas circuit outfan.
Further, first gas circuit outfan is connected to detector outfan by threeway adaptor.
Further, described gas sensor is specially a sensor unit device or a sensor array.
Further, described enricher is specially tubular type enricher or the minitype gathering device making using MEMS technology.
Further, stop valve is provided with second gas circuit, controls the open and close of second gas circuit.
The one or more technical schemes providing in the embodiment of the present invention, at least have the following technical effect that or advantage：
Due to employing the method accelerating the response of trace gas integrated detector, based on a kind of gas path device, including connection
It is in turn connected to form main gas circuit in the enricher of air inlet, gas sensor, the first air pump, also include：By three-way valve by
One gas circuit is connected to enricher outfan；By three-way valve by second gas circuit bypass enricher directly by gas sensor with
Air inlet is connected；When enrichment and real-time detection work simultaneously, control and open three-way valve, a gas part passes through richness by air inlet
After storage enrichment, tail gas is discharged by first gas circuit, and gas another part is passed directly into gas by air inlet by a gas circuit and passes
Sensor is detected；When being detected after enrichment, closed by controlling three-way valve, heat enricher, to the gas after enrichment
Detected, after the completion of detection, stop heating and being allowed to cool to initial temperature to enricher, solve in prior art
There is the slow technical problem of gas integrated detector response speed, and then achieve and can quickly trace gas be responded
Technique effect.
Brief description
Fig. 1 by the embodiment of the present invention by the structural representation of double pump, the constituted gas circuit of double three-way valve；
Fig. 2 by the embodiment of the present invention by the structural representation of double pump, single constituted gas circuit of three-way valve；
Fig. 3 by the embodiment of the present invention by the structural representation of single pump, single constituted gas circuit of three-way valve.
Specific embodiment
The embodiment of the present invention is passed through to provide a kind of method accelerating the response of trace gas integrated detector, solves existing skill
There is the slow technical problem of gas integrated detector response speed in art, and then achieve and can quickly trace gas be rung
The technique effect answered.
Below in conjunction with the accompanying drawings and embodiment is made to the gas circuit of integrated gas sensors system of the present invention and job step
Further description：
As shown in figure 1, embodiment one, the gas detector gas circuit based on double pump, double three-way valve.
In the gas path device of this quickening trace gas integrated detector response, using 2 air pumps, 2 three-way valve, 1 three
Enricher and sensor are coupled together by logical adaptor, for the detection of toxic gas simulant DMMP.Enricher is that MEMS is rich
Storage, gas sensor is surface acoustic wave (SAW) sensor array of Unit 4.
Wherein, threeway adaptor, enricher, three-way valve 1, three-way valve 2, SAW sensor array, the first air pump 1 are gone here and there successively
Connection, forms main gas circuit；Separate first gas circuit 1 to be connected with the second air pump 2 at three-way valve 1, formed and be enriched with special gas circuit；Air inlet
Three-way interface at mouthful is separated second gas circuit 2 and is connected with rear end three-way valve 2, has bypassed enricher, forms real-time gas detection
Path.
During original state, all of part is all in closed mode.After starting working, the job step of this integrated detector
As follows：
A) first gas circuit 1 connected by three-way valve 1, opens the second air pump 2, the mixed gas containing DMMP are pumped into enrichment
Device is enriched with, and three-way valve 2 connects second gas circuit 2 and gas sensor simultaneously, opens the first air pump 1, by containing DMMP's
Mixed gas pump into gas sensor and are detected.In this stage, gas sensor may detect 0.08mg/m3Concentrations above
DMMP, for 1mg/m3DMMP, response time is about 20s.
B) enrichment closed air pump 2 after 2 minutes, MEMS enricher is heated 3 seconds, is rapidly heated to about 200 DEG C.Heating
While completing, two three-way valve turn on main gas circuit, and the high concentration mixed gas of enricher desorption are pumped into biography by the first air pump 1
Sensor is detected.In this stage, gas sensor can detect that 0.007mg/m3DMMP.From starting to sample gas sensing
The time that device provides signal is about 3-4 minute.
C), after detection terminates, return to a step, carry out the circulation of a to b.
This gas circuit employs 2 air pumps.Wherein second air pump 2 adopts the atmospheric pump that pumping speed is 600sccm, the second air pump 1
Using the little air pump for 200sccm for the pumping speed, and air inlet, enricher and air pump 2 are connected using the extra heavy pipe of internal diameter 1mm, and remaining
The partial tubule being connected by internal diameter 0.5mm.Enricher and gas sensor so can also be taken into account to gas flow simultaneously
Different demands.
DMMP is the simulant of the G such as sarin system never poison, and the above results show, this integrated sensor can not only be at 4 points
As little as 0.01mg/m is detected in clock3Poison, and work as 1mg/m3When the poison of concentrations above occurs, can in 30s at once
Report to the police.
As shown in Fig. 2 the gas detector gas circuit based on double pump, single three-way valve for the embodiment two
Compared with embodiment one, the difference of the gas path device of this quickening trace gas integrated detector response is to implement
Three-way valve 2 in example one has been substituted for threeway adaptor, and increased a stop valve in the centre of second gas circuit 2.Pass through
On-off function to second gas circuit 2 is realized in the opening and closing of stop valve, remaining gas circuit structure and workflow with embodiment one
Identical.
As shown in figure 3, the gas detector gas circuit based on single pump, single three-way valve for the embodiment three
In the gas path device of this quickening trace gas integrated detector response, employ tubular type enricher and FPD detector
MEMS enricher in alternate embodiment one, two and SAW sensor array, for detecting the sulfur series foul smell gas gas such as methyl sulfide.With
Embodiment two is compared, and the difference of this integrated gas detector is to eliminate the first air pump 2, and bypasses gas with one section of trachea and pass
Sensor is connected with the second air pump 1 of rear end.
During original state, all of part is all in closed mode.After starting working, the job step of this integrated detector
As follows：
A) open the first air pump 1, and remain working condition.First gas circuit 1 connected by three-way valve, and organic sulfur is treated
Survey gas pumps into tubular type enricher and is enriched with, and opens stop valve simultaneously, under test gas is pumped into FPD detector and is detected.
B) after enrichment 5-10 minute, gas sensor connected by three-way valve, simultaneously closes off stop valve, and heated Tube enrichment
Device about 8 seconds, is rapidly heated to about 180 DEG C, and the high concentrations of gas of desorption enters gas sensor and detected.
C), after detection terminates, return to a step, carry out the circulation of a to b.
By above-mentioned three kinds of embodiments such that it is able to quickly trace gas are carried out with the technique effect of quick response.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So, claims are intended to be construed to including excellent
Select embodiment and fall into being had altered and changing of the scope of the invention.
Obviously, those skilled in the art can carry out the various changes and modification essence without deviating from the present invention to the present invention
God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprise these changes and modification.
Claims (7)
1. a kind of method accelerating the response of trace gas integrated detector, based on a kind of gas path device, including being connected to air inlet
Enricher, gas sensor, the first air pump be in turn connected to form main gas circuit, first gas circuit is connected to by richness by three-way valve
Storage outfan；Second gas circuit is bypassed directly by gas sensor and air inlet by enricher by three-way valve or threeway adaptor
Mouth is connected；It is characterized in that, the job step of this gas path device is：
1. when enrichment and real-time detection work simultaneously, control and open three-way valve, a gas part passes through enricher by air inlet
After enrichment, tail gas is discharged by first gas circuit, and gas another part is passed directly into gas by air inlet by second gas circuit and passes
Sensor is detected；
2. when being detected after enrichment, close first gas circuit by controlling three-way valve, close second gas circuit, heating enrichment
Device, is passed through gas sensor to the gas after enrichment and detects；
3., after the completion of detection, stop heating and being allowed to cool to initial temperature to enricher.
2. the method accelerating the response of trace gas integrated detector according to claim 1 is it is characterised in that in air inlet
Place connects enricher air inlet and second gas circuit air inlet respectively by threeway adaptor.
3. the method accelerating the response of trace gas integrated detector according to claim 1 is it is characterised in that at first
Gas circuit outfan connects the second air pump.
4. the method accelerating the response of trace gas integrated detector according to claim 1 is it is characterised in that by first
Gas circuit outfan is connected to detector outfan by threeway adaptor.
5. the method accelerating the response of trace gas integrated detector according to claim arbitrary in claim 1-4, its feature
It is, described gas sensor is specially a sensor unit device or a sensor array.
6. the method accelerating the response of trace gas integrated detector according to claim arbitrary in claim 1-4, its feature
It is, described enricher is specially tubular type enricher or the minitype gathering device making using MEMS technology.
7. the method accelerating the response of trace gas integrated detector according to claim 1 is it is characterised in that at second
Stop valve is provided with gas circuit, controls the open and close of second gas circuit.
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| CN201410476582.0A CN104181228B (en) | 2014-09-18 | 2014-09-18 | Method capable of accelerating response of trace gas integrated detector |
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| CN201410476582.0A CN104181228B (en) | 2014-09-18 | 2014-09-18 | Method capable of accelerating response of trace gas integrated detector |
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| CN104181228B true CN104181228B (en) | 2017-02-22 |
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| JP7085001B2 (en) * | 2018-08-08 | 2022-06-15 | パナソニックホールディングス株式会社 | Detection method of detector, control system, detection system, and program |
| CN109342131B (en) * | 2018-11-16 | 2021-07-06 | 北京雪迪龙科技股份有限公司 | Low-concentration mercury detection system and detection method |
| CN110926884A (en) * | 2019-11-15 | 2020-03-27 | 山东创策电气科技有限公司 | Rapid gas circulation detection system and detection method thereof |
| CN110849680A (en) * | 2019-12-17 | 2020-02-28 | 北京市劳动保护科学研究所 | Gas enrichment device |
| CN111060589A (en) * | 2020-01-10 | 2020-04-24 | 湖北锐意自控系统有限公司 | System and method for measuring concentration of anesthetic gas |
| CN112881609A (en) * | 2021-01-19 | 2021-06-01 | 武汉微纳传感技术有限公司 | Miniature multichannel trace gas concentration analyzer |
| CN113328683A (en) * | 2021-06-15 | 2021-08-31 | 李彬 | Solar photovoltaic power generation device convenient to installation |
| CN114383903B (en) * | 2021-12-24 | 2023-05-09 | 同方威视技术股份有限公司 | Trace gas sampling device and detection system |
| CN114487036A (en) * | 2022-01-10 | 2022-05-13 | 海宁微纳芯传感技术有限公司 | MEMS gas sensor with gas enrichment function and working method thereof |
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