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CN102374880A - Gas flow meter, portable detection device based on ion migration, gas flow measurement method - Google Patents

Gas flow meter, portable detection device based on ion migration, gas flow measurement method Download PDF

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Publication number
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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gas
airflow
flow
vibrating reed
sound
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CN102374880B (en
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焦鹏
张阳天
王耀昕
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Nuctech Co Ltd
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Nuctech Co Ltd
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Abstract

The invention discloses a gas flowmeter, comprising: a structure body, wherein an airflow channel for flowing gas 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 to generate vibration along with the passing of the airflow; a sound sensor provided on an outer wall of the structure body at a position close to the vibration-causing reed, and sensing a sound amplitude generated by the vibration; and a processing unit that obtains a corresponding flow rate of the airflow based on the sound amplitude from the sound sensor. The invention also relates to a portable detection device based on ion mobility, the detection device comprising: a portable ion mobility spectrometer comprising a carrier gas conduit for providing a carrier gas for bringing a test sample into the portable ion mobility spectrometer; and the above gas flowmeter. The invention also provides a gas flow measuring method.

Description

Gas meter, based on portable checkout equipment, the gas flow measurement method of ion migration
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)

1.一种气体流量计，包括：1. A gas flowmeter, comprising: 结构体，结构体的内部形成供气体流过的气流通道；A structure, the inside of which forms an airflow channel for gas to flow through; 起振簧片，所述起振簧片的固有频率恒定并且所述起振簧片固定在气流通道内以随着气流的通过而产生振动；A vibrating reed, the natural frequency of the vibrating reed is constant and the vibrating reed is fixed in the airflow passage to vibrate along with the passage of the airflow; 声音传感器，所述声音传感器在临近起振簧片的位置设置在结构体的外壁上，且所述声音传感器感测由所述振动产生的声音振幅；和an acoustic sensor disposed on the outer wall of the structure at a position adjacent to the vibrating reed, and the acoustic sensor senses the amplitude of the sound produced by the vibration; and 处理单元，所述处理单元基于来自声音传感器的所述声音振幅获得气流的对应流量。A processing unit that obtains a corresponding flow rate of the airflow based on the amplitude of the sound from the sound sensor. 2.根据权利要求1所述的气体流量计，其中：2. The gas flow meter of claim 1, wherein: 所述处理单元在气体流量超出流量范围时发出警报。The processing unit sends out an alarm when the gas flow exceeds the flow range. 3.根据权利要求1所述的气体流量计，其中：3. The gas flow meter of claim 1, wherein: 所述起振簧片由耐腐蚀的材料制成。The vibrating reed is made of corrosion-resistant material. 4.根据权利要求1-3中任一项所述的气体流量计，其中：4. A gas flow meter according to any one of claims 1-3, wherein: 所述起振簧片的起振部分的延伸方向大致与气流的流动方向垂直。The extension direction of the vibrating part of the vibrating reed is substantially perpendicular to the flow direction of the airflow. 5.根据权利要求4所述的气体流量计，其中：5. The gas flow meter of claim 4, wherein: 所述结构体的流动通道内设置有孔板，所述孔板垂直于气流的流动方向布置，且气流仅流动通过设置在孔板上的一个开口，所述起振簧片的起振部分与所述开口间隔开地延伸过所述开口。An orifice is arranged in the flow channel of the structure, and the orifice is arranged perpendicular to the flow direction of the airflow, and the airflow only flows through one opening provided on the orifice, and the vibrating part of the vibrating reed is connected to the The openings extend spaced therethrough. 6.根据权利要求1-3中任一项所述的气体流量计，其中：6. The gas flow meter according to any one of claims 1-3, wherein: 所述处理单元包括AD转换器和微处理器，所述AD转换器将来自声音传感器的信号进行AD转换后，将数据传送给微处理器，所述微处理器对传送的数据进行处理以获得气体的对应流量。The processing unit includes an AD converter and a microprocessor, the AD converter performs AD conversion on the signal from the sound sensor, and transmits the data to the microprocessor, and the microprocessor processes the transmitted data to obtain The corresponding flow rate of the gas. 7.根据权利要求6所述的气体流量计，其中：7. The gas flow meter of claim 6, wherein: 所述微处理器对传送的数据进行插值、平滑、降噪处理中的至少一个。The microprocessor performs at least one of interpolation, smoothing, and noise reduction on the transmitted data. 8.一种基于离子迁移的便携式检测设备，包括：8. A portable detection device based on ion mobility, comprising: 便携式离子迁移谱仪，所述便携式离子迁移谱仪包括提供载气的载气管道，所述载气用于将检测样品带入到便携式离子迁移谱仪内；和A portable ion mobility spectrometer, said portable ion mobility spectrometer comprising a carrier gas pipeline providing a carrier gas for bringing a test sample into the portable ion mobility spectrometer; and 根据权利要求1-7中任一项所述的气体流量计，其中所述结构体为所述载气管道的一个管段，所述气体为载气。The gas flow meter according to any one of claims 1-7, wherein the structure is a section of the carrier gas pipeline, and the gas is carrier gas. 9.一种气体流量测量方法，包括以下步骤：9. A gas flow measurement method, comprising the following steps: 在供气体流过的气体通道内部设置起振簧片，所述起振簧片的固有频率恒定并且所述起振簧片随着气流的通过而产生振动；A vibrating reed is arranged inside the gas passage for the gas to flow through, the natural frequency of the vibrating reed is constant and the vibrating reed vibrates as the air flow passes through; 在气体通道的外壁上临近起振簧片的位置设置声音传感器，所述声音传感器感测由所述振动产生的声音振幅；和An acoustic sensor is provided on the outer wall of the gas passage adjacent to the vibrating reed, and the acoustic sensor senses the amplitude of the sound produced by the vibration; and 基于来自所述声音传感器的声音振幅获得气流的对应流量。The corresponding flow rate of the airflow is obtained based on the amplitude of the sound from the sound sensor. 10.根据权利要求9所述的方法，其中：10. The method of claim 9, wherein: 基于来自所述声音传感器的信号获得气流的对应流量的步骤包括：The step of obtaining a corresponding flow rate of the airflow based on the signal from the acoustic sensor comprises: 将来自声音传感器的信号进行AD转换；Perform AD conversion on the signal from the sound sensor; 对AD转换后获得的数据进行插值、平滑、降噪处理中的至少一个后获得气流的对应流量。At least one of interpolation, smoothing, and noise reduction processing is performed on the data obtained after AD conversion to obtain the corresponding flow rate of the airflow.
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Cited By (5)

* Cited by examiner, † Cited by third party
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
CN113790844A (en) * 2021-10-10 2021-12-14 爱德森（厦门）电子有限公司 Reed type wind power and wind direction detection sensor device and detection method thereof
CN118464321A (en) * 2024-07-15 2024-08-09 江苏柯汇医疗科技有限公司 Sampling forceps runner stability detection system with flushing function and working method thereof

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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 flow meters, portable detection devices based on ion mobility

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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 flow meters, portable detection devices based on ion mobility

Cited By (8)

* Cited by examiner, † Cited by third party
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
CN113790844A (en) * 2021-10-10 2021-12-14 爱德森（厦门）电子有限公司 Reed type wind power and wind direction detection sensor device and detection method thereof
CN113790844B (en) * 2021-10-10 2024-09-17 爱德森（厦门）电子有限公司 Reed type wind power and wind direction detection sensor device and detection method thereof
CN118464321A (en) * 2024-07-15 2024-08-09 江苏柯汇医疗科技有限公司 Sampling forceps runner stability detection system with flushing function and working method thereof
CN118464321B (en) * 2024-07-15 2024-09-17 江苏柯汇医疗科技有限公司 Sampling forceps runner stability detection system with flushing function and working method thereof

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