CN113203793B - Voice coil element-based gas-liquid two-phase detection device and method - Google Patents
Voice coil element-based gas-liquid two-phase detection device and method Download PDFInfo
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- CN113203793B CN113203793B CN202110475749.1A CN202110475749A CN113203793B CN 113203793 B CN113203793 B CN 113203793B CN 202110475749 A CN202110475749 A CN 202110475749A CN 113203793 B CN113203793 B CN 113203793B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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- G01N2291/021—Gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention belongs to the technical field of detection, and discloses a gas-liquid two-phase detection device based on a voice coil element, which comprises an alternating current excitation source, the voice coil element, a sampling element and a demodulation circuit; the voice coil element and the sampling element are connected in series between two power supply pins of the alternating current excitation source, and the sampling element is connected in parallel with the demodulation circuit; the voltage signal of the sampling element is sent to the demodulation circuit, the voice coil element is a sensitive element for electromagnetic gas and liquid medium detection, and the voice coil element is arranged in a medium to be detected. The voice coil element is used as a sensitive element for gas-liquid detection, and has the advantage of strong environmental adaptability; according to the physical characteristics of the detected object, such as density, viscosity and the like, the method has the advantages of wide applicable objects, sensitive detection and high reliability.
Description
Technical Field
The invention belongs to the technical field of detection, relates to a gas-liquid two-phase detection device and method, and in particular relates to a gas-liquid two-phase detection device and method based on a voice coil element.
Background
The gas-liquid phase detection technology is widely applied to the fields of aviation, petroleum, chemical industry, energy sources and the like, and is an indispensable detection technology. The existing gas-liquid phase detection method mainly comprises mechanical detection, equivalent conductivity detection, photoelectric refraction detection, acoustic wave detection, electromagnetic (light) wave detection and the like, and each detection method has different characteristics and application ranges.
However, many of the current methods rely on the electrical and optical characteristics of the detection object, so there is a certain limit to the detection object.
Disclosure of Invention
The purpose of the invention is that: the gas-liquid two-phase detection device and the method based on the voice coil element are independent of the characteristics of electricity, light and the like of a detection object, and have the advantages of being high in sensitivity, reliability, applicability and the like.
The technical scheme of the invention is as follows:
a gas-liquid two-phase detection device based on a voice coil element comprises an alternating current excitation source, the voice coil element, a sampling element and a demodulation circuit; the voice coil element and the sampling element are connected in series between two power supply pins of the alternating current excitation source, and the sampling element is connected in parallel with the demodulation circuit; the voltage signal of the sampling element is sent to the demodulation circuit, the voice coil element is a sensitive element for electromagnetic gas and liquid medium detection, and the voice coil element is arranged in a medium to be detected.
Further, the voice coil element is of a horn-like structure, and the horn portion is immersed in a medium to be detected.
Further, the voice coil element comprises a permanent magnet, a vibrating diaphragm, a voice coil and U-shaped iron, wherein the U-shaped iron is of a bowl-shaped structure with a cross section approximately in a U shape, the permanent magnet is arranged at the bottom of a bowl of the U-shaped iron, a vibrating diaphragm is arranged at a bowl cover of the U-shaped iron, the voice coil is arranged at the inner side of the vibrating diaphragm and extends downwards between the permanent magnet and the bowl side wall of the U-shaped iron, and a magnetic conduction plate is arranged above the permanent magnet; the U iron of the voice coil element is arranged on the supporting structure, and the vibrating diaphragm of the voice coil element is arranged in a medium to be detected.
Further, a protective net is arranged above the vibrating diaphragm.
Further, a sound discharging hole is arranged below the U-shaped iron.
A gas-liquid two-phase detection method based on a voice coil element, which uses the gas-liquid two-phase detection device based on the voice coil element, comprises the following steps:
step one, an alternating current excitation source generates excitation voltage of a fixed frequency sine or square wave close to the minimum impedance frequency of a voice coil element in a gas phase, the voltage is applied to a voice coil electrode of the voice coil element, and the voice coil element is driven to generate mechanical vibration with the same frequency as the excitation voltage of the alternating current excitation source;
step two, the voice coil element is placed in a medium to be detected;
and thirdly, sending the voltages at two ends of the voice coil element to a demodulation circuit, and identifying the current medium around the voice coil element by the demodulation circuit according to the characteristic parameters of the sampled voltage, thereby realizing the detection of the gas-liquid two-phase medium.
Further, the identification method for realizing the detection of the gas-liquid two-phase medium comprises the following steps: the impedance of the voice coil element in the gas phase is minimum, so that the amplitude of the sampling voltage at two ends of the sampling element is maximum; when the voice coil element is placed in the liquid, the impedance value of the voice coil element is increased, so that the amplitude of the sampling voltage at two ends of the sampling element is reduced;
and taking a certain value among the characteristic values of the voice coil element in the gas and the liquid as a judging threshold value k, comparing the detected or conditioned characteristic value with the judging threshold value k, and judging whether the medium is gas or liquid according to the comparison result.
Further, the characteristic value is the voltage or frequency of the voice coil element in the gas and the liquid respectively, or the voltage amplitude or frequency is conditioned to obtain the value.
The invention has the advantages that:
the invention adopts the voice coil element as a sensitive element for gas-liquid detection, and the voice coil element consists of a voice coil, a permanent magnet, a magnetizer, a vibrating diaphragm, a protective net and the like, and has the advantage of strong environmental adaptability; according to the physical characteristics of the detected object, such as density, viscosity and the like, the method has the advantages of wide applicable objects, sensitive detection and high reliability.
Drawings
FIG. 1 is a schematic diagram of a gas-liquid two-phase detection method based on a voice coil element according to the present invention;
FIG. 2 is a schematic structural view of a voice coil element according to the present invention;
the device comprises a 1-alternating current excitation source, a 2-voice coil element, a 3-sampling element, a 4-demodulation circuit, a 2-1-permanent magnet, a 2-vibrating diaphragm, a 2-3-voice coil, a 2-4-U iron, a 2-5-magnetic conduction plate, a 2-6-sound discharging hole, a 2-7-protective net, a 2-8-front protective net hole, a 5-container, a 6-front cavity and a 7-rear cavity.
Detailed Description
This section is an embodiment of the present invention for explaining and explaining the technical solution of the present invention.
A gas-liquid two-phase detection device based on a voice coil element comprises an alternating current excitation source 1, a voice coil element 2, a sampling element 3 and a demodulation circuit 4; the voice coil element 2 and the sampling element 3 are connected in series between two power supply pins of the alternating current excitation source 1, and the sampling element 3 is connected in parallel with the demodulation circuit 4; the voltage signal of the sampling element 3 is sent to the demodulation circuit 4, the voice coil element 2 is a sensitive element for electromagnetic gas and liquid medium detection, and the voice coil element 2 is arranged in a medium to be detected. The voice coil element is adopted, so that the electro-optical characteristic of the element is not depended, and the use environment of gas-liquid detection is ensured.
The voice coil element 2 is of a horn-like structure, and the horn portion is immersed in a medium to be detected. The voice coil element 2 of the horn-like structure is a conventional model of a voice coil-like structure, but in gas-liquid detection, the horn-like diffusion structure element is arranged in a gas/liquid medium, so that the contact area between the detection part of the voice coil element 2 and the gas/liquid medium can be remarkably increased, and the detection sensitivity is improved.
The voice coil element 2 comprises a permanent magnet 2-1, a vibrating diaphragm 2-2, a voice coil 2-3 and a U-shaped iron 2-4,U iron 2-4, wherein the cross section of the voice coil 2-3 and the U-shaped iron 2-4 is of a bowl-shaped structure with a roughly U-shaped cross section, the permanent magnet 2-1 is arranged at the bowl bottom of the U-shaped iron 2-4, the vibrating diaphragm 2-2 is covered on the bowl cover of the U-shaped iron 2-4, the voice coil 2-3 is arranged at the inner side of the vibrating diaphragm 2-2 and extends downwards between the permanent magnet 2-1 and the bowl side wall of the U-shaped iron 2-4, and a magnetic conduction plate 2-5 is arranged above the permanent magnet 2-1; the U-iron 2-4 of the voice coil element 2 is mounted on a support structure, and the diaphragm 2-2 of the voice coil element 2 is disposed in a medium to be inspected. The design of the structure is completed based on the horn-shaped structure, when the gas/liquid medium is detected, the permanent magnet 2-1, the vibrating diaphragm 2-2, the voice coil 2-3 and other parts are immersed into the gas/liquid medium, and the vibrating diaphragm 2-2 and other parts can also be immersed into the gas/liquid medium, so that the energizing vibration state of the voice coil element can be influenced in the gas/liquid medium, the energizing connection part of the voice coil element is not influenced, and the service life of the voice coil element is prolonged.
The upper part of the vibrating diaphragm 2-2 is also provided with a protective net 2-7, and the lower part of the U-shaped iron 2-4 is provided with a sound leakage hole 2-6. The protective net 2-7 is a protective net arranged on the U-shaped iron 2-4, and isolates the vibrating diaphragm 2-2 from the outside, thereby protecting the vibrating diaphragm 2-2. The protection net 2-7 and the vibrating diaphragm 2-2 form a front cavity 6, the vibrating diaphragm 2-2 and the upper side of the U-shaped iron 2-4 form a rear cavity 7, in order to ensure that the air/liquid medium can enter the vicinity of the vibrating diaphragm 2-2, the protection net 2-7 is necessarily a net with through holes, and in order to enable the audio frequency vibration to smoothly diffuse so as to detect the air/liquid medium, the sound leakage holes 2-6 are arranged below the U-shaped iron 2-4, and the mechanical vibration is ensured not to be transmitted only towards the front cavity.
A gas-liquid two-phase detection method based on a voice coil element, which uses the gas-liquid two-phase detection device based on the voice coil element, comprises the following steps:
step one, an alternating current excitation source generates excitation voltage of a fixed frequency sine or square wave close to the minimum impedance frequency of a voice coil element in a gas phase, the voltage is applied to a voice coil electrode of the voice coil element, and the voice coil element is driven to generate mechanical vibration with the same frequency as the excitation voltage of the alternating current excitation source;
step two, the voice coil element is placed in a medium to be detected;
and thirdly, sending the voltages at two ends of the voice coil element to a demodulation circuit, and identifying the current medium around the voice coil element by the demodulation circuit according to the characteristic parameters of the sampled voltage, thereby realizing the detection of the gas-liquid two-phase medium.
The identification method for realizing the detection of the gas-liquid two-phase medium comprises the following steps: the impedance of the voice coil element in the gas phase is minimum, so that the amplitude of the sampling voltage at two ends of the sampling element is maximum; when the voice coil element is placed in the liquid, the impedance value of the voice coil element is increased, so that the amplitude of the sampling voltage at two ends of the sampling element is reduced;
and taking a certain value among the characteristic values of the voice coil element in the gas and the liquid as a judging threshold value k, comparing the detected or conditioned characteristic value with the judging threshold value k, and judging whether the medium is gas or liquid according to the comparison result.
The characteristic value is the voltage or frequency of the voice coil element in the gas and the liquid respectively, or the voltage amplitude or frequency is regulated to obtain the value.
Claims (5)
1. The gas-liquid two-phase detection device based on the voice coil element is characterized by comprising an alternating current excitation source (1), the voice coil element (2), a sampling element (3) and a demodulation circuit (4); the voice coil element (2) and the sampling element (3) are connected in series between two power supply pins of the alternating current excitation source (1), and the sampling element (3) is connected in parallel with the demodulation circuit (4); the voltage signal of the sampling element (3) is sent to the demodulation circuit (4), the voice coil element (2) is a sensitive element for detecting electromagnetic gas and liquid media, and the voice coil element (2) is arranged in the media to be detected;
the voice coil element (2) is of a horn-shaped structure, and the horn part is immersed in a medium to be detected;
the voice coil element (2) comprises a permanent magnet (2-1), a vibrating diaphragm (2-2), a voice coil (2-3) and U-shaped iron (2-4), wherein the U-shaped iron (2-4) is of a bowl-shaped structure with a cross section approximately in a U shape, the permanent magnet (2-1) is arranged at the bottom of a bowl of the U-shaped iron (2-4), the vibrating diaphragm (2-2) is covered on a bowl cover of the U-shaped iron (2-4), the voice coil (2-3) is arranged at the inner side of the vibrating diaphragm (2-2) and extends downwards between the permanent magnet (2-1) and the bowl side wall of the U-shaped iron (2-4), and a magnetic conduction plate (2-5) is arranged above the permanent magnet (2-1); the U-shaped iron (2-4) of the voice coil element (2) is arranged on the supporting structure, and the vibrating diaphragm (2-2) of the voice coil element (2) is arranged in a medium to be detected.
2. The voice coil element-based gas-liquid two-phase detection device according to claim 1, wherein a protective net (2-7) is further arranged above the diaphragm (2-2).
3. The voice coil element-based gas-liquid two-phase detection device according to claim 2, wherein a sound release hole (2-6) is formed below the U-shaped iron (2-4).
4. A gas-liquid two-phase detection method based on a voice coil element, characterized in that the gas-liquid two-phase detection device based on the voice coil element according to claim 1 is used, comprising the following steps:
step one, an alternating current excitation source generates excitation voltage of a fixed frequency sine or square wave close to the minimum impedance frequency of a voice coil element in a gas phase, the voltage is applied to a voice coil electrode of the voice coil element, and the voice coil element is driven to generate mechanical vibration with the same frequency as the excitation voltage of the alternating current excitation source;
step two, the voice coil element is placed in a medium to be detected;
step three, the voltage at two ends of the voice coil element is sent to a demodulation circuit, and the demodulation circuit identifies the current medium around the voice coil element according to the characteristic parameters of the sampled voltage, so that the detection of the gas-liquid two-phase medium is realized;
the identification method for realizing the detection of the gas-liquid two-phase medium comprises the following steps: the impedance of the voice coil element in the gas phase is minimum, so that the amplitude of the sampling voltage at two ends of the sampling element is maximum; when the voice coil element is placed in the liquid, the impedance value of the voice coil element is increased, so that the amplitude of the sampling voltage at two ends of the sampling element is reduced;
and taking a certain value among the characteristic values of the voice coil element in the gas and the liquid as a judging threshold value k, comparing the detected or conditioned characteristic value with the judging threshold value k, and judging whether the medium is gas or liquid according to the comparison result.
5. The method of claim 4, wherein the characteristic value is a voltage or a frequency of the voice coil element in the gas and the liquid, respectively, or a voltage amplitude or a frequency is adjusted to obtain the value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110475749.1A CN113203793B (en) | 2021-04-29 | 2021-04-29 | Voice coil element-based gas-liquid two-phase detection device and method |
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| CN202110475749.1A CN113203793B (en) | 2021-04-29 | 2021-04-29 | Voice coil element-based gas-liquid two-phase detection device and method |
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| CN113203793B true CN113203793B (en) | 2023-07-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1414382A (en) * | 2002-08-30 | 2003-04-30 | 天津大学 | Detector of gas liquid two phase flow split-phase content based on resistance chromatographic imaging and method |
| CN102109451B (en) * | 2011-01-23 | 2012-06-27 | 浙江大学 | Non-contact conductive gas/liquid two-phase flow pattern identifying device and method |
| CN102928476B (en) * | 2012-11-14 | 2014-11-12 | 中国兵器工业计算机应用技术研究所 | Measuring sensor for gas content in water flow and detecting treatment method for gas content in water flow |
| CN103235036B (en) * | 2013-04-12 | 2015-12-23 | 厦门艾帝尔电子科技有限公司 | Based on pick-up unit and the method for the differentiation inside and outside wall defect of electromagnetic detection signal |
| CN205510389U (en) * | 2016-03-04 | 2016-08-24 | 歌尔声学股份有限公司 | Loudspeaker |
| CN105865962B (en) * | 2016-03-15 | 2019-02-01 | 浙江大学 | A kind of wireless QCM-D vapor detection system and method for electromagnetic excitation |
| CN112050869A (en) * | 2020-08-20 | 2020-12-08 | 长江武汉航道工程局 | Continuous alternating magnetic field measuring device and method thereof |
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