CN102374880A - Gas flowmeter, ion migration-based portable detection equipment, and method for measuring gas flow - Google Patents
Gas flowmeter, ion migration-based portable detection equipment, and method for measuring gas flow Download PDFInfo
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- CN102374880A CN102374880A CN 201010254204 CN201010254204A CN102374880A CN 102374880 A CN102374880 A CN 102374880A CN 201010254204 CN201010254204 CN 201010254204 CN 201010254204 A CN201010254204 A CN 201010254204A CN 102374880 A CN102374880 A CN 102374880A
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Abstract
The invention discloses a gas flowmeter. The gas flowmeter comprises a structure body, a vibration reed, a sound sensor and a processing unit, wherein a gas flow channel through which gas passes is formed inside the structure body; the natural frequency of the vibration reed is constant, and the vibration reed is fixed in the airflow channel so as vibrate along with the passing gas flow; the sound sensor is arranged on the outer wall of the structure body close to the vibration reed, and is used for sensing sound vibration amplitude generated by the vibration; the processing unit is used for acquiring a corresponding flow of the gas flow on the basis of the sound vibration amplitude from the sound sensor. The invention also relates to ion migration-based portable detection equipment. The detection equipment comprises a portable ion migration spectrometer and the gas flowmeter, wherein the portable ion migration spectrometer comprises a carrier gas pipeline for supplying carrier gas; and the carrier gas is used for carrying detection samples into the portable ion migration spectrometer. The invention also provides a method for measuring the gas flow.
Description
Technical field
The present invention relates to the gas flow measurement field, relate in particular to a kind of gas meter, a kind of portable checkout equipment and a kind of gas flow measurement method of using this gas meter based on the ion migration.
Background technology
The ion migrating technology is a kind of quick, sensitive, portable on-the-spot detection technique.This technology has begun to be applied to military and safety check mechanism, can detect gas, explosive, drugs etc.
, need reliable and stable air-flow and bring test sample into checkout equipment inside (this air-flow is called carrier gas), and then analyze and detect when the operate as normal based on this type checkout equipment of ion migration as carrier.Therefore, the checkout equipment key that can normally detect is stable air-flow.
In the process that reality is used, often cause gas circuit to be stopped up because some impurity are brought in carrier gas into, or since in the use carrier gas corrosion of tracheae is caused tracheae gas leakage, make checkout equipment can not reach the testing goal of expection.
At present, in portable checkout equipment, there is the restriction of the factors such as characteristic (carrier gas contains the organic gas composition usually), maximum gas flow of space, gas based on ion migration.And the general volume of existing flow sensor is bigger, and can not measure organic gas.
Above restriction causes at present and in the portable checkout equipment based on the ion migration carrier gas air flow rate is not monitored in real time, or simply insert suspended body flowmeter rely on the user artificial judge confirm whether flow normal.Increase the uncertain factor in the checkout equipment use like this, perhaps increased user's workload.
Summary of the invention
Consider that the problems referred to above propose the present invention.
According to an aspect of the present invention, proposed a kind of gas meter, having comprised: structure, the inside of structure forms the gas channel that supplied gas flows through; Starting of oscillation reed, the constant and said starting of oscillation reed of the natural frequency of said starting of oscillation reed are fixed in the gas channel to pass through to produce vibration along with air-flow; Sound transducer, said sound transducer is arranged on the outer wall of structure in the position of closing on the starting of oscillation reed, and said sound transducer sensing is by the sound amplitude of said vibration generation; And processing unit, said processing unit is based on the corresponding flow that obtains air-flow from the said sound amplitude of sound transducer.
Advantageously, said processing unit gives the alarm when gas flow excess flow scope.
Advantageously, said starting of oscillation reed is processed by corrosion-resistant material.
Advantageously, roughly the flow direction with air-flow is vertical for the bearing of trend of the starting of oscillation of said starting of oscillation reed part.
Advantageously; Be provided with orifice plate in the flow channel of said structure; Said orifice plate arranges perpendicular to the flow direction of air-flow, and air-flow only flows through being arranged on an opening on the orifice plate, the starting of oscillation part of said starting of oscillation reed and the said opening said opening of extend through of turning up the soil at interval.
Advantageously; Said processing unit comprises AD converter and microprocessor; Said AD converter will send data to microprocessor after will carrying out the AD conversion from the signal of sound transducer, and said microprocessor is handled to obtain the corresponding flow of gas the data that transmit.Advantageously, said microprocessor carries out at least one in interpolation, level and smooth, the noise reduction process to the data that transmit.
In accordance with a further aspect of the present invention; A kind of portable checkout equipment based on the ion migration is provided; This checkout equipment comprises portable ionic migration spectrometer and above-mentioned gas meter; Wherein: said portable ionic migration spectrometer comprises the carrier gas channel that carrier gas is provided, and said carrier gas is used for test sample is brought in the portable ionic migration spectrometer; And said structure is a pipeline section of said carrier gas channel, and said gas is carrier gas.
According to another aspect of the invention; A kind of gas flow measurement method is provided; Said method comprising the steps of: at the gas passage set inside starting of oscillation reed that supplied gas flows through, the constant and said starting of oscillation reed of the natural frequency of said starting of oscillation reed is along with air-flow passes through to produce vibration; The position of on the outer wall of gas passage, closing on the starting of oscillation reed is provided with sound transducer, the sound amplitude that said sound transducer sensing is produced by said vibration; With based on the corresponding flow that obtains air-flow from the sound amplitude of said sound transducer.
Further, above-mentionedly comprise: will carry out the AD conversion from the signal of sound transducer based on the step that obtains the corresponding flow of air-flow from the signal of said sound transducer; Carry out the corresponding flow that at least one back in interpolation, level and smooth, the noise reduction process obtains air-flow with the data that AD conversion back is obtained.
Description of drawings
Through describing embodiments of the invention in detail with reference to accompanying drawing, it is clearer that the present invention will become, wherein:
Fig. 1 is the structural representation of gas meter according to an embodiment of the invention;
Fig. 2 is the schematic perspective view of gas meter according to an embodiment of the invention; With
Fig. 3 is the schematic three dimensional views after the structure of the gas meter among Fig. 2 is cut open.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.In instructions, same or analogous drawing reference numeral is indicated same or analogous parts.Following explanation to embodiment of the present invention is intended to present general inventive concept of the present invention is made an explanation with reference to accompanying drawing, and is not to be understood that to a kind of restriction of the present invention.
Shown in accompanying drawing 1-Fig. 3, the invention discloses a kind of gas meter 100, this gas meter 100 comprises: structure 1, the inside of structure 1 forms the gas channel 2 that supplied gas flows through; Starting of oscillation reed 3, the constant and starting of oscillation reed 3 of the natural frequency of starting of oscillation reed 3 are fixed in the gas channel 2 to pass through to produce vibration along with air-flow; Sound transducer 4, sound transducer 4 is arranged on the outer wall of structure 1 in the position of closing on starting of oscillation reed 3, and sound transducer 4 sensings are by the sound amplitude of said vibration generation; With processing unit 5, processing unit 5 is based on the corresponding flow that obtains air-flow from the said sound amplitude of sound transducer 4.
Because the natural frequency of starting of oscillation reed 3 is constant, when the air communication of different flow is crossed starting of oscillation reed 3, because the amplitude of starting of oscillation reed 3 is different; The sound amplitude that corresponds on the natural frequency is also different, and there is corresponding relation in the size of sound amplitude and gas flow, promptly; The flow of the gas through starting of oscillation reed 3 is big; Then corresponding sound amplitude is big, and the flow of the gas through starting of oscillation reed 3 is little, and then corresponding sound amplitude is little.
If the maximal value and the minimum value of the gas flow that permission is passed through are respectively L
MaxAnd L
Min, then the corresponding minimum and maximum sound amplitude corresponding to the natural frequency of starting of oscillation reed 3 is respectively A
MaxAnd A
MinBecause the natural frequency of starting of oscillation reed 3 is constant, can identify the sound amplitude A of starting of oscillation reed 3 on natural frequency through the frequency amplitude recognizer
c, certainly, based on this sound amplitude A
cAlso just confirmed corresponding gas flow L
cIf A
cBe in A
MinAnd A
MaxBetween, or L
cBe in L
MaxAnd L
MinBetween, show that then gas flow is in normal working flow, otherwise send alerting signal.
In addition, because in the present invention, sound transducer 4 is arranged on the outer wall of structure 1 in the position of closing on starting of oscillation reed 3, so, can avoid of the influence of mordant organic gas for surveying instruments such as sound transducers.More advantageously, starting of oscillation reed 3 can be processed by corrosion-resistant material.
For the flow of detected gas more effectively, the bearing of trend of the starting of oscillation part 6 of the starting of oscillation reed 3 roughly flow direction with air-flow is vertical.
Shown in Fig. 2 and Fig. 3; Be provided with orifice plate 7 in the flow channel 2 of structure 1; Orifice plate 7 arranges perpendicular to the flow direction of air-flow, and air-flow only flows through being arranged on an opening 8 on the orifice plate, the starting of oscillation part 6 of starting of oscillation reed 3 and the opening 8 extend through opening 8 of turning up the soil at interval.Like this, even under the low discharge situation, also can produce necessary amplitude to starting of oscillation part 6.Under the situation that is provided with orifice plate 7, starting of oscillation reed 3 preferably one is fixed on the orifice plate 7.
As shown in fig. 1; Processing unit 5 comprises AD converter 9 and microprocessor 10; AD converter 9 will send data to microprocessor 10 after will carrying out the AD conversion from the signal of sound transducer 4, and the data of 10 pairs of transmission of microprocessor are handled to obtain the corresponding flow of gas.
Advantageously, microprocessor carries out at least one in interpolation, level and smooth, the noise reduction process to the data that transmit.For example, existing under the situation of neighbourhood noise, can adopt noise reduction process.
The invention still further relates to a kind of portable checkout equipment based on the ion migration; This checkout equipment comprises: portable ionic migration spectrometer; Said portable ionic migration spectrometer comprises the carrier gas channel that carrier gas is provided, and said carrier gas is used for test sample is brought in the portable ionic migration spectrometer; With aforementioned gas meter 100, wherein structure 1 is a pipeline section of said carrier gas channel, and said gas is carrier gas.
Use the portable checkout equipment based on the ion migration of above-mentioned gas flowmeter 100; Whether the air flow rate that can monitor carrier gas in real time is in range of normal value; Neighbourhood noise and electromagnetism can be got rid of in the checkout equipment course of work to the interference of flow measurement, and the influence of organic gas can be avoided measuring equipment.In other words, above-mentioned gas flowmeter 100 is applied to the portable checkout equipment based on the ion migration, can guarantees that instrument is in normal duty.For example, gas meter 100 can be monitored carrier gas flux and whether is in the operate as normal value, when carrier gas flux is too high or too low for a certain reason, can produce alerting signal and remind the user to take measures, thereby guarantee the normal operation of instrument.
The invention still further relates to a kind of gas flow measurement method, may further comprise the steps: at the gas passage set inside starting of oscillation reed that supplied gas flows through, the constant and starting of oscillation reed of the natural frequency of starting of oscillation reed is along with air-flow passes through to produce vibration; The position of on the outer wall of gas passage, closing on the starting of oscillation reed is provided with sound transducer, the sound amplitude that the sound transducer sensing is produced by said vibration; With based on the corresponding flow that obtains air-flow from the signal of said sound transducer.Advantageously, can comprise based on the step that obtains the corresponding flow of air-flow from the sound amplitude of said sound transducer: will carry out the AD conversion from the signal of sound transducer; The data that AD conversion back is obtained are carried out the corresponding flow that at least one back in interpolation, level and smooth, the noise reduction process obtains air-flow.
The present invention has been described with reference to example embodiment.But, obvious, those skilled in the art can obviously draw modification and the change that plurality of optional is selected under the instruction of foregoing description.Thereby the present invention comprises the spirit that falls into accompanying claims and all selectable modification and the changes within the scope.
Claims (10)
1. gas meter comprises:
Structure, the inside of structure forms the gas channel that supplied gas flows through;
Starting of oscillation reed, the constant and said starting of oscillation reed of the natural frequency of said starting of oscillation reed are fixed in the gas channel to pass through to produce vibration along with air-flow;
Sound transducer, said sound transducer is arranged on the outer wall of structure in the position of closing on the starting of oscillation reed, and said sound transducer sensing is by the sound amplitude of said vibration generation; With
Processing unit, said processing unit is based on the corresponding flow that obtains air-flow from the said sound amplitude of sound transducer.
2. gas meter according to claim 1, wherein:
Said processing unit gives the alarm when gas flow excess flow scope.
3. gas meter according to claim 1, wherein:
Said starting of oscillation reed is processed by corrosion-resistant material.
4. according to each described gas meter among the claim 1-3, wherein:
Roughly the flow direction with air-flow is vertical for the bearing of trend of the starting of oscillation part of said starting of oscillation reed.
5. gas meter according to claim 4, wherein:
Be provided with orifice plate in the flow channel of said structure; Said orifice plate is arranged perpendicular to the flow direction of air-flow; And air-flow only flows through being arranged on an opening on the orifice plate, the starting of oscillation part of said starting of oscillation reed and the said opening said opening of extend through of turning up the soil at interval.
6. according to each described gas meter among the claim 1-3, wherein:
Said processing unit comprises AD converter and microprocessor, and said AD converter will send data to microprocessor after will carrying out the AD conversion from the signal of sound transducer, and said microprocessor is handled to obtain the corresponding flow of gas the data that transmit.
7. gas meter according to claim 6, wherein:
Said microprocessor carries out at least one in interpolation, level and smooth, the noise reduction process to the data that transmit.
8. portable checkout equipment based on ion migration comprises:
Portable ionic migration spectrometer, said portable ionic migration spectrometer comprises the carrier gas channel that carrier gas is provided, said carrier gas is used for test sample is brought in the portable ionic migration spectrometer; With
According to each described gas meter among the claim 1-7, wherein said structure is a pipeline section of said carrier gas channel, and said gas is carrier gas.
9. gas flow measurement method may further comprise the steps:
At the gas passage set inside starting of oscillation reed that supplied gas flows through, the constant and said starting of oscillation reed of the natural frequency of said starting of oscillation reed is along with air-flow passes through to produce vibration;
The position of on the outer wall of gas passage, closing on the starting of oscillation reed is provided with sound transducer, the sound amplitude that said sound transducer sensing is produced by said vibration; With
Based on the corresponding flow that obtains air-flow from the sound amplitude of said sound transducer.
10. method according to claim 9, wherein:
The step that obtains the corresponding flow of air-flow based on the signal from said sound transducer comprises:
To carry out the AD conversion from the signal of sound transducer;
The data that AD conversion back is obtained are carried out the corresponding flow that at least one back in interpolation, level and smooth, the noise reduction process obtains air-flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010254204 CN102374880B (en) | 2010-08-13 | 2010-08-13 | Gas flowmeter, ion migration-based portable detection equipment, and method for measuring gas flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010254204 CN102374880B (en) | 2010-08-13 | 2010-08-13 | Gas flowmeter, ion migration-based portable detection equipment, and method for measuring gas flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102374880A true CN102374880A (en) | 2012-03-14 |
| CN102374880B CN102374880B (en) | 2013-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010254204 Active CN102374880B (en) | 2010-08-13 | 2010-08-13 | Gas flowmeter, ion migration-based portable detection equipment, and method for measuring gas flow |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017155985A1 (en) * | 2016-03-07 | 2017-09-14 | Gilbarco Inc. | Fuel dispenser having acoustic waves coriolis flow meter |
| US10703622B2 (en) | 2017-01-20 | 2020-07-07 | Gillbarco Inc. | Fuel dispenser with a fuel analyzer |
| CN113739864A (en) * | 2021-09-08 | 2021-12-03 | 北京声智科技有限公司 | Gas flow detection method and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4584883A (en) * | 1981-11-10 | 1986-04-29 | Fuji Electric Company, Ltd. | Karman vortex flowmeter |
| US20020083979A1 (en) * | 2000-12-28 | 2002-07-04 | Isao Suzuki | Mass flowmeter |
| CN101598584A (en) * | 2004-09-29 | 2009-12-09 | 松下电器产业株式会社 | Flow measurement device |
| CN201844851U (en) * | 2010-08-13 | 2011-05-25 | 同方威视技术股份有限公司 | Gas flowmeter and portable testing equipment based on ion migration |
-
2010
- 2010-08-13 CN CN 201010254204 patent/CN102374880B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4584883A (en) * | 1981-11-10 | 1986-04-29 | Fuji Electric Company, Ltd. | Karman vortex flowmeter |
| US20020083979A1 (en) * | 2000-12-28 | 2002-07-04 | Isao Suzuki | Mass flowmeter |
| CN101598584A (en) * | 2004-09-29 | 2009-12-09 | 松下电器产业株式会社 | Flow measurement device |
| CN201844851U (en) * | 2010-08-13 | 2011-05-25 | 同方威视技术股份有限公司 | Gas flowmeter and portable testing equipment based on ion migration |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017155985A1 (en) * | 2016-03-07 | 2017-09-14 | Gilbarco Inc. | Fuel dispenser having acoustic waves coriolis flow meter |
| US10173885B2 (en) | 2016-03-07 | 2019-01-08 | Gilbarco Inc. | Fuel dispenser having acoustic waves coriolis flow meter |
| US10703622B2 (en) | 2017-01-20 | 2020-07-07 | Gillbarco Inc. | Fuel dispenser with a fuel analyzer |
| CN113739864A (en) * | 2021-09-08 | 2021-12-03 | 北京声智科技有限公司 | Gas flow detection method and electronic equipment |
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| Publication number | Publication date |
|---|---|
| CN102374880B (en) | 2013-01-02 |
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