CN102889968A - Acoustical method and device for detecting low-concentration sulfur hexafluoride gas - Google Patents
Acoustical method and device for detecting low-concentration sulfur hexafluoride gas Download PDFInfo
- Publication number
- CN102889968A CN102889968A CN2012103862379A CN201210386237A CN102889968A CN 102889968 A CN102889968 A CN 102889968A CN 2012103862379 A CN2012103862379 A CN 2012103862379A CN 201210386237 A CN201210386237 A CN 201210386237A CN 102889968 A CN102889968 A CN 102889968A
- Authority
- CN
- China
- Prior art keywords
- sulfur hexafluoride
- wave
- detection
- sound wave
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 63
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 59
- 238000004891 communication Methods 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims description 18
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 230000003750 conditioning effect Effects 0.000 claims description 6
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 5
- 230000000994 depressogenic effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 46
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 230000000172 allergic effect Effects 0.000 description 1
- 208000010668 atopic eczema Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000003822 preparative gas chromatography Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses an acoustical method and a device for detecting low-concentration sulfur hexafluoride gas. The method comprises the following steps of: utilizing a relation between velocity of ultrasonic wave transmitting in gas and gas molar mass, measuring travel time when the acoustic wave passes through a detection channel with fixed length by a method of amplitude modulation and envelope detection applied to communication, calculating the travel time in air without mixed sulfur hexafluoride under a current environmental condition at the same time, and representing sulfur hexafluoride concentration by use of time difference of ultrasonic wave detection propagation delay and reference propagation delay. The method has a good detection effect and high precision, and problems of insufficient detection precision of the travel time and a cross cycle in a conventional low-concentration sulfur hexafluoride acoustic velocity detection technology are solved, and precise detection of low-concentration sulfur hexafluoride concentration in a single channel manner is realized.
Description
Technical field
The present invention relates to acoustic method and device thereof that a kind of low concentration sulfur hexafluoride gas detects, be applied in middle pressure, high pressure and the extra high voltage circuit breaker of electric system, the leakage of sulfur hexafluoride gas-insulating and arc-extinguishing medium is detected online.
Background technology
Sulfur hexafluoride (SF
6) be to have remarkable electrical insulating property and the gas of arc quenching characteristic.The sulfur hexafluoride of described low concentration refers to the sulfur hexafluoride of concentration in 0 ~ 3000ppm scope.In power industry, SF
6Be widely used in electricity and lead equipment chain, such as power switch, enclosed capacitor group, transformer etc.In service, SF
6The leakage of gas is inevitable, when high-current on-off is arranged, because strong arc discharge can produce the subfluoride of some sulfur-bearings in leak scene.These substance reaction abilities are stronger, can further react with electrode material, hydrone again when water and oxygen are arranged, and produce poisonous or hypertoxic gas thereby decompose.The bad reactions such as flu, allergic, n and V, fatigue can appear being similar in the main insulting respiratory system of these toxic gases after the poisoning, when inhalation dose is large, more serious consequence can occur.In addition because SF
6Specific gravity of gas is larger than air, leaks easily to assemble, and easily causes low sheaf space anoxic, causes the field personnel to suffocate.Therefore, accurately detect SF in the air
6Gas concentration is the guarantee of device security reliability service, and its security also receives global concern.For SF
6The device context environment is to the threat of human health, country has formulated relevant criterion--" The guide for processing and measuring SF6 gas in power apparatus " (GB/T 8905-1996), and wherein talk about among the 7.3.3: indoors the ground floor of equipment installation site is answered oxygen measuring apparatus and the concentration of sulfur hexafluoride instrument of mounting strap warning device ... the concentration of sulfur hexafluoride instrument sends warning when sulfur hexafluoride content reaches 1000 μ L/L in air ... as find to ventilate, take a breath when defective.
On physical property, SF
6Be a kind of colourless, tasteless, nontoxic nonflammable gas under the normality, proportion is about 5 times of air.On chemical property, its chemical composition stability has fabulous thermal stability.Therefore detect SF
6Gas concentration is difficult to picture and detects O
2Perhaps CO
2Equally adopt chemical sensor.People are the method for research application other measure gas concentrations once also, as: vapor-phase chromatography, coefficient of heat conductivity method, electron drift method, spectroscopic methodology, negative corona discharge method etc.But these methods all need expensive instrument and equipment, and require the operator to have quite high operant level, obviously all are not suitable for.The existing sulfur hexafluoride detection system that is used for the high-voltage transforming scene is many based on three kinds of principles, a kind of principle that is based on high-voltage corona discharge, when containing the sulfur hexafluoride gas of variable concentrations in the air, the electric current of high-voltage corona discharge just changes to some extent, determines the size of the concentration of the sulfur hexafluoride that leaks in the air by the size of measuring this discharge current.This type of equipment volume is little, is convenient to make up network, but its high-voltage corona discharge sensor life-time is shorter, and work that can not be steady in a long-term, and be difficult to the stability that reaches higher, its staking-out work is difficulty relatively also.Second method is to utilize SF
6Gas has the feature of strong absorption to infrared ray, come qualitative or detect quantitatively SF
6Leakage situation, the accuracy of detection of this kind equipment is high at present, but cost is very high.So market is starved of a kind of simple and easy economy, high real-time, stablizes the detection that measuring equipment small and exquisite, the high life carries out the on-the-spot concentration of sulfur hexafluoride of high pressure.The third method is exactly that the sonic detection technology detects SF
6Concentration, the method that generally adopts the method for sound speed detection or propagation delay to detect, it has utilized such principle: when the molecular weight of two kinds of gases that consist of binary mixture differed larger, sound propagation velocity changed with the difference of two kinds of gas compositions.The method that also has a kind of acoustics is to be beneficial to the acoustic attenuation method that gas of different nature detects the attenuation degree difference of the sound wave of different frequency.
But also there are some problems in the acoustic detection method of present employed concentration of sulfur hexafluoride.Application number be " 200810025458.7 " Patent Application Publication a kind of " ultrasonic wave detecting system and the method for centralized cycle formula sulfur hexafluoride gas concentration ", what the method adopted at Design and implementation is binary channels time difference measurement method, in other words, that measurement by phase differential realizes, but there is fuzzy problem of cycle in this measuring method, therefore, the method is difficult to be in harmonious proportion the contradiction between accuracy of detection and the sensing range.In addition, utilize the attenuation of ultrasound method of the detection concentration of sulfur hexafluoride that gas with various develops the different principle of hyperacoustic degree of absorption, better to the detection effect of high concentration sulfur hexafluoride, but not good enough to the detection effect of low concentration.
Summary of the invention
The objective of the invention is: provide a kind of detection effective, and acoustic method and device thereof that the low concentration sulfur hexafluoride gas that precision is high detects, there is the contradiction that is difficult to be in harmonious proportion between accuracy of detection and the sensing range to solve in existing sound velocity method or the propagation delay method, overcomes the deficiency of prior art.
In order to achieve the above object, first technical scheme of the present invention is: the acoustic method that a kind of low concentration sulfur hexafluoride gas detects, and its innovative point is: the step of described detection is:
Step a, send pulse modulated wave by the microcomputer unit, and begin timing by timer;
Step b, described pulse modulated wave drive the transmitting terminal of soic wave transmitting energy converter and send sound wave by after the power amplification of driver element, and described soic wave transmitting energy converter is contained in length and is
Sense channel one end;
The sound wave that step c, described soic wave transmitting energy converter send by length is
Sense channel after, the sound wave receiving transducer that is equipped with by the sense channel other end receives, and described sound wave receiving transducer is converted to electric signal with the sound wave that receives;
After steps d, the electric signal process signal condition unit conditioning by the output of sound wave receiving transducer, be produced as the hopping edge of expression sound wave due in;
Step e, stop timing by the hopping edge triggering timing device of expression sound wave due in, the timing starting point among the integrating step a is calculated the sonic detection propagation delay of the air that is mixed with sulfur hexafluoride in the sense channel by the microcomputer unit
Step f, gather the Current Temperatures data by temperature sensor module, and the length of sense channel, being calculated under this temperature by the microcomputer unit, pressure is the airborne velocity of sound that 1 normal atmosphere is depressed, and utilizes at last the sonic detection propagation delay
With the reference propagation delay
Poor
Characterize sulfur hexafluoride gas concentration.
In above-mentioned first technical scheme, the pulse modulated wave that described microcomputer unit sends comprises carrier wave and modulating wave, the carrier frequency of described carrier wave is identical with the centre frequency of soic wave transmitting energy converter and sound wave receiving transducer, and the frequency of modulated wave of described modulating wave is controlled at the 1/(10 of the carrier frequency of carrier wave ~ 40) scope in; The pulse modulated wave that described microcomputer unit sends is the individual pulse modulating wave, or set of pulses modulating wave.
In above-mentioned first technical scheme, after filtering, amplification, detection and the voltage ratio conditioning of electric signal through the signal condition unit of described sound wave receiving transducer output, be produced as the hopping edge of expression sound wave due in.
In above-mentioned first technical scheme, described timer is the timer that is embedded in the microcomputer unit, or the timer of the individual devices that is electrically connected with the microcomputer unit.
In above-mentioned first technical scheme, among the step f in the length of Current Temperatures data and sense channel 8
And the reference propagation delay that calculates
, be to be calculated by following formula:
In order to achieve the above object, second technical scheme of the present invention is: a kind of acoustic apparatus that detects the low concentration sulfur hexafluoride gas comprises microcomputer unit, driver element, acoustic wave transducer, signal condition unit, temperature sensor module, communications interface unit and the accommodating sense channel that is mixed with the detection gas of sulfur hexafluoride of embedded timer; Described acoustic wave transducer comprises soic wave transmitting energy converter and sound wave receiving transducer, and soic wave transmitting energy converter and sound wave receiving transducer are contained in respectively the two ends of sense channel; The output terminal of described microcomputer unit is electrically connected with the soic wave transmitting energy converter that is contained in sense channel one end by driver element, and the sound wave receiving transducer that is contained in the sense channel other end is electrically connected with the input end of microcomputer unit by the signal condition unit; Described temperature sensor module is connected with communications interface unit with the microcomputer unit communication and is connected.
In second above-mentioned technical scheme, described signal condition unit comprises filtering circuit, amplifying circuit, peak detection circuit and voltage comparator circuit; Described filtering circuit, amplifying circuit, peak detection circuit and voltage comparator circuit are electrically connected successively, and filtering circuit is electrically connected with the sound wave receiving transducer, and voltage comparator circuit is electrically connected with the input end of microcomputer unit.
In second above-mentioned technical scheme, described peak detection circuit comprises detecting circuit and the first filtering circuit that is electrically connected successively, and described detecting circuit is electrically connected with amplifying circuit, and the first filtering circuit is electrically connected with voltage comparator circuit.
In second above-mentioned technical scheme, described communications interface unit is wireless communication interface circuit.
In second above-mentioned technical scheme, described communications interface unit is the wired communication interface circuit.
The good effect that the present invention has is: the relation when the present invention has utilized ultrasound wave to propagate in gas between the velocity of sound and the gas molal weight, and adopt amplitude modulation(PAM) in being applied to communicate by letter and the method for envelope detection, measure sound wave in travel-time or the velocity of sound of the sense channel that passes through regular length, and then the method for definite gas componant has solved travel-time accuracy of detection deficiency and cycle fuzzy problem in the existing sound velocity method Gas Thickness Detecting Technology, realized the employing single-channel mode to gas concentration, especially for the accurate detection of the concentration of sulfur hexafluoride of low concentration.The double-channel detector of single channel detector of the present invention in the prior art, more succinct on the structure, power consumption is lower, is easier to miniaturization, and the present invention can develop into wireless sensor node in the future.
Description of drawings
Fig. 1 is the structural principle schematic diagram of the acoustic apparatus of detection low concentration sulfur hexafluoride gas of the present invention;
Fig. 2 is the electrical block diagram of signal condition unit among Fig. 1;
Fig. 3 is the circuit theory diagrams of Fig. 1;
Fig. 4 is the algorithm flow chart of the computation structure of the acoustic method that detects of low concentration sulfur hexafluoride gas of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Embodiment 1
Shown in Fig. 1,2,4, the acoustic method that a kind of low concentration sulfur hexafluoride gas detects, the step of described detection is:
Step a, send pulse modulated wave by microcomputer unit 1, and begin timing by timer;
Step b, described pulse modulated wave drive the transmitting terminal of soic wave transmitting energy converter 3 and send sound wave by after the power amplification of driver element 2, and described soic wave transmitting energy converter 3 is contained in length and is
Sense channel 8 one ends;
The sound wave that step c, described soic wave transmitting energy converter 3 send by length is
Sense channel 8 after, the sound wave receiving transducer 4 that is equipped with by sense channel 8 other ends receives, and described sound wave receiving transducer 4 is converted to electric signal with the sound wave that receives;
After steps d, electric signal process signal condition unit 5 conditionings by 4 outputs of sound wave receiving transducer, be produced as the hopping edge of expression sound wave due in;
Step e, stop timing by the hopping edge triggering timing device of expression sound wave due in, the timing starting point among the integrating step a is calculated the sonic detection propagation delay of the air that is mixed with sulfur hexafluoride in the sense channel 8 by microcomputer unit 1
Step f, gather the Current Temperatures data by temperature sensor module 6, and the length of sense channel 8, being calculated under this temperature by microcomputer unit 1, pressure is the airborne velocity of sound that 1 normal atmosphere is depressed, and utilizes at last the sonic detection propagation delay
With the reference propagation delay
Poor
Characterize sulfur hexafluoride gas concentration.
In actual applications, sound wave is with reference to propagation delay
Computing formula be:
Therefore, sulfur hexafluoride gas concentration
Be expressed as the sonic detection propagation delay
With the reference propagation delay
Poor:
In general, our reference gas is air, because the molal weight of sulfur hexafluoride is higher 4 times than air, and other parameter is all at the same order of magnitude, and therefore, the velocity of sound of tested gas obviously reduces along with the increase of concentration of sulfur hexafluoride.
Described with reference to propagation delay
Design conditions and detect propagation delay
Temperature, pressure, sense channel identical length with.
Drive preferably effect in order to ensure reaching, the pulse modulated wave that described microcomputer unit 1 sends comprises carrier wave and modulating wave, the carrier frequency of described carrier wave is identical with the centre frequency of soic wave transmitting energy converter 3 and sound wave receiving transducer 4, and the frequency of modulated wave of described modulating wave is controlled at the 1/(10 of the carrier frequency of carrier wave ~ 40) scope in; The pulse modulated wave that described microcomputer unit 1 sends is the individual pulse modulating wave, or set of pulses modulating wave.
As shown in Figure 2, in order to guarantee to get exactly the due in that receives sound wave, after filtering, amplification, detection and the voltage ratio conditioning of electric signal through signal condition unit 5 of described sound wave receiving transducer 4 outputs, be produced as the hopping edge of expression sound wave due in.
Timer of the present invention is the timer that is embedded in the microcomputer unit 1, or the timer of the individual devices that is electrically connected with microcomputer unit 1.The present invention preferentially selects the timer that is embedded in the microcomputer unit 1, and that is because can reduce wiring, convenient operation, minimizing error, also can reduce production costs.
Embodiment 2
As shown in Figure 1, 2, 3, a kind of acoustic apparatus that detects the low concentration sulfur hexafluoride gas comprises microcomputer unit 1, driver element 2, acoustic wave transducer, signal condition unit 5, temperature sensor module 6, communications interface unit 7 and the accommodating sense channel 8 that is mixed with the detection gas of sulfur hexafluoride of embedded timer; Described acoustic wave transducer comprises soic wave transmitting energy converter 3 and sound wave receiving transducer 4, and soic wave transmitting energy converter 3 and sound wave receiving transducer 4 are contained in respectively the two ends of sense channel 8; The output terminal of described microcomputer unit 1 is electrically connected with the soic wave transmitting energy converter 3 that is contained in sense channel 8 one ends by driver element 2, and the sound wave receiving transducer 4 that is contained in sense channel 8 other ends is electrically connected with the input end of microcomputer unit 1 by signal condition unit 5; Described temperature sensor module 6 and communications interface unit 7 communicate to connect with microcomputer unit 1 respectively.
As shown in Figure 3, in order to guarantee to get exactly the due in that receives sound wave, described signal condition unit 5 comprises filtering circuit 5-1, amplifying circuit 5-2, peak detection circuit 5-3 and voltage comparator circuit 5-4; Described filtering circuit 5-1, amplifying circuit 5-2, peak detection circuit 5-3 and voltage comparator circuit 5-4 are electrically connected successively, and filtering circuit 5-1 is electrically connected with sound wave receiving transducer 4, and voltage comparator circuit 5-4 is electrically connected with the input end of microcomputer unit 1.
As shown in Figure 3, in order further to improve signal integrity, reduce disturbance, and then raising measuring accuracy, described peak detection circuit 5-3 comprises detecting circuit 5-3-1 and the first filtering circuit 5-3-2 that is electrically connected successively, described detecting circuit 5-3-1 is electrically connected with amplifying circuit 5-2, and the first filtering circuit 5-3-2 is electrically connected with voltage comparator circuit 5-4.
For so that the variation that measurement data of the present invention is communicated by letter with host computer, described communications interface unit 7 is wireless communication interface circuit, or the wired communication interface circuit.Described communications interface unit 7 and host computer communication connection, the data that then will measure, calculate externally transmit.Carry out timing controlled because described microcomputer unit 1 is direct driver element 2 to sound wave, therefore, the present invention can realize the purposes such as Timing measurement gas concentration.
When the acoustic apparatus of detection low concentration sulfur hexafluoride gas of the present invention uses, be mounted in might occur equipment that sulfur hexafluoride leaks under, in case SF
6Behind the Leakage Gas, the through hole that can be provided with by sense channel 8 enters in the sense channel 8.
As shown in Figure 4, the measuring method based on the acoustic apparatus of above-mentioned described detection low concentration sulfur hexafluoride gas is:
(1), produce and send set of pulses modulating wave after driver element 2 power amplifications by microcomputer unit 1, drive soic wave transmitting energy converter 3 emission sound waves and pass sense channel 8, open simultaneously embedded timer and begin timing;
(2), sound wave receiving transducer 4 is converted to electric signal with the sound wave that receives, and 5 carries out conversion through the signal condition unit, last microcomputer unit 1 stops timing during signal at once after receiving conversion, calculate the detection propagation delay by microcomputer unit 1
(3), gather current environment temperature according to temperature sensor module 6, then by microcomputer unit 1 computing reference propagation delay
(4), by calculating the poor of two propagation delays, the sign concentration of sulfur hexafluoride.
It is ATMEGA16_TQFP44 that model is preferentially selected in microcomputer of the present invention unit 1, and soic wave transmitting energy converter 3 and sound wave receiving transducer 4 are preferentially selected by the precious company of Taiwan light and produced, and model is the acoustic wave transducer of TC40-16T/R.Certainly, the present invention also can select microcomputer unit and the acoustic wave transducer of other model.
Input, the output terminal of unit of the present invention are marked with label, and the pin label that unit need to connect is consistent.
The present invention is by measuring the detection propagation delay
(in length be
Sense channel 8 be mixed with the air of sulfur hexafluoride gas), by calculating with reference to propagation delay
(in length be
Sense channel 8 reference gas (air) is arranged), can characterize the concentration of sulfur hexafluoride with both difference.Because the time-delay of electric signal is far smaller than the Acoustic Wave Propagation time-delay, therefore, pulse modulated wave is travel-time of 3 from microcomputer unit 1 to soic wave transmitting energy converter, and sound wave receiving transducer 4 to microcomputer unit 1 receives feedback time again, can ignore, can not affect the present invention to the concentration detection of sulfur hexafluoride gas.
The above only is preferred implementation of the present invention; be noted that for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
The acoustic method detection method that low concentration sulfur hexafluoride gas of the present invention detects is simple, effective, and precision is high, and the acoustic apparatus that its low concentration sulfur hexafluoride gas detects is not only simple in structure, and cost is low.The invention solves in existing sound velocity method or the propagation delay method and have accuracy of detection and the conflicting problem of sensing range.
Claims (10)
1. the acoustic method that detects of a low concentration sulfur hexafluoride gas, it is characterized in that: the step of described detection is:
Step a, send pulse modulated wave by microcomputer unit (1), and begin timing by timer;
Step b, described pulse modulated wave drive the transmitting terminal of soic wave transmitting energy converter (3) and send sound wave by after the power amplification of driver element (2), and described soic wave transmitting energy converter (3) is contained in length and is
Sense channel (8) one ends;
The sound wave that step c, described soic wave transmitting energy converter (3) send by length is
Sense channel (8) after, the sound wave receiving transducer (4) that is equipped with by sense channel (8) other end receives, and described sound wave receiving transducer (4) is converted to electric signal with the sound wave that receives;
After steps d, electric signal process signal condition unit (5) conditioning by sound wave receiving transducer (4) output, be produced as the hopping edge of expression sound wave due in;
Step e, stop timing by the hopping edge triggering timing device of expression sound wave due in, the timing starting point among the integrating step a is calculated the sonic detection propagation delay that is mixed with the air of sulfur hexafluoride in the sense channel (8) by microcomputer unit (1)
Step f, gather the Current Temperatures data by temperature sensor module (6), and the length of sense channel (8), calculated under this temperature by microcomputer unit (1), pressure is the airborne velocity of sound that 1 normal atmosphere is depressed, and utilizes at last the sonic detection propagation delay
With the reference propagation delay
Poor
Characterize sulfur hexafluoride gas concentration.
2. the acoustic method that detects of low concentration sulfur hexafluoride gas according to claim 1, it is characterized in that: the pulse modulated wave that described microcomputer unit (1) sends comprises carrier wave and modulating wave, the carrier frequency of described carrier wave is identical with the centre frequency of soic wave transmitting energy converter (3) and sound wave receiving transducer (4), and the frequency of modulated wave of described modulating wave is controlled at the 1/(10 of the carrier frequency of carrier wave ~ 40) scope in; The pulse modulated wave that described microcomputer unit (1) sends is the individual pulse modulating wave, or set of pulses modulating wave.
3. the acoustic method that detects of low concentration sulfur hexafluoride gas according to claim 1, it is characterized in that: after filtering, amplification, detection and the voltage ratio conditioning of electric signal through signal condition unit (5) of described sound wave receiving transducer (4) output, be produced as the hopping edge of expression sound wave due in.
4. the acoustic method that detects of low concentration sulfur hexafluoride gas according to claim 1, it is characterized in that: described timer is the timer that is embedded in the microcomputer unit (1), or the timer of the individual devices that is electrically connected with microcomputer unit (1).
5. the acoustic method that detects of low concentration sulfur hexafluoride gas according to claim 1 is characterized in that: among the step f in the length of Current Temperatures data and sense channel (8)
And the reference propagation delay that calculates
, be to be calculated by following formula:
6. an acoustic apparatus that detects the low concentration sulfur hexafluoride gas is characterized in that: the microcomputer unit (1), driver element (2), acoustic wave transducer, signal condition unit (5), temperature sensor module (6), communications interface unit (7) and the accommodating sense channel (8) that is mixed with the detection gas of sulfur hexafluoride that comprise embedded timer; Described acoustic wave transducer comprises soic wave transmitting energy converter (3) and sound wave receiving transducer (4), and soic wave transmitting energy converter (3) and sound wave receiving transducer (4) are contained in respectively the two ends of sense channel (8); The output terminal of described microcomputer unit (1) is electrically connected with the soic wave transmitting energy converter that is contained in sense channel (8) one ends (3) by driver element (2), and the sound wave receiving transducer (4) that is contained in sense channel (8) other end is electrically connected with the input end of microcomputer unit (1) by signal condition unit (5); Described temperature sensor module (6) and communications interface unit (7) communicate to connect with microcomputer unit (1) respectively.
7. the acoustic apparatus of detection low concentration sulfur hexafluoride gas according to claim 6, it is characterized in that: described signal condition unit (5) comprises filtering circuit (5-1), amplifying circuit (5-2), peak detection circuit (5-3) and voltage comparator circuit (5-4); Described filtering circuit (5-1), amplifying circuit (5-2), peak detection circuit (5-3) and voltage comparator circuit (5-4) are electrically connected successively, and filtering circuit (5-1) is electrically connected with sound wave receiving transducer (4), and voltage comparator circuit (5-4) is electrically connected with the input end of microcomputer unit (1).
8. the acoustic apparatus of detection low concentration sulfur hexafluoride gas according to claim 7, it is characterized in that: described peak detection circuit (5-3) comprises detecting circuit (5-3-1) and the first filtering circuit (5-3-2) that is electrically connected successively, described detecting circuit (5-3-1) is electrically connected with amplifying circuit (5-2), and the first filtering circuit (5-3-2) is electrically connected with voltage comparator circuit (5-4).
9. the acoustic apparatus of detection low concentration sulfur hexafluoride gas according to claim 7, it is characterized in that: described communications interface unit (7) is wireless communication interface circuit.
10. the acoustic apparatus of detection low concentration sulfur hexafluoride gas according to claim 7, it is characterized in that: described communications interface unit (7) is the wired communication interface circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210386237.9A CN102889968B (en) | 2012-10-12 | 2012-10-12 | Acoustical method for detecting low-concentration sulfur hexafluoride gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210386237.9A CN102889968B (en) | 2012-10-12 | 2012-10-12 | Acoustical method for detecting low-concentration sulfur hexafluoride gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102889968A true CN102889968A (en) | 2013-01-23 |
| CN102889968B CN102889968B (en) | 2015-05-13 |
Family
ID=47533546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210386237.9A Active CN102889968B (en) | 2012-10-12 | 2012-10-12 | Acoustical method for detecting low-concentration sulfur hexafluoride gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102889968B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954401A (en) * | 2014-04-09 | 2014-07-30 | 国家电网公司 | SF6 gas leakage locating insulation tape used for GIS |
| CN103994813A (en) * | 2014-04-28 | 2014-08-20 | 中国计量学院 | Small-diameter gas velocity measurement test device and test method thereof |
| CN105403369A (en) * | 2015-12-16 | 2016-03-16 | 深圳供电局有限公司 | Method and system for airtightness detection of GIS |
| CN106052970A (en) * | 2016-07-27 | 2016-10-26 | 广西电网有限责任公司电力科学研究院 | Gas leakage detection system |
| CN106248148A (en) * | 2016-09-22 | 2016-12-21 | 深圳市润普科技有限公司 | Supersonic gas body sensor |
| CN107328528A (en) * | 2016-04-29 | 2017-11-07 | 国家电网公司 | A kind of ultrasonic wave air tightness detection system and method based on multisensor |
| CN107941428A (en) * | 2017-11-15 | 2018-04-20 | 哈尔滨工程大学 | One kind immersion tank body air-tightness automatic ultrasonic detecting system and detection method |
| CN109974939A (en) * | 2017-08-23 | 2019-07-05 | 福建中电合创电力科技有限公司 | A kind of method and system of the comprehensive detection SF6 leakage of detection |
| CN112394106A (en) * | 2020-11-02 | 2021-02-23 | 珠海华瑞诚科技有限公司 | Distribution room system and SF6 gas concentration detection method |
| CN113295344A (en) * | 2021-04-28 | 2021-08-24 | 成都秦川物联网科技股份有限公司 | Method for detecting gas leakage by ultrasonic wave |
| WO2022121771A1 (en) * | 2020-12-08 | 2022-06-16 | 重庆海尔制冷电器有限公司 | Method and device for inspecting reservoir |
| CN116754641A (en) * | 2023-08-23 | 2023-09-15 | 湖北工业大学 | Hydrogen concentration detection device and method |
| CN117147067A (en) * | 2023-10-12 | 2023-12-01 | 国网湖北省电力有限公司超高压公司 | Electric equipment hidden danger detection method and system based on SF6 gas analysis |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2779398Y (en) * | 2005-02-28 | 2006-05-10 | 河海大学常州校区 | Transmitter for measuring gas concentration of sulfur hexafluoride |
| CN101021562A (en) * | 2006-11-20 | 2007-08-22 | 重庆大学 | Method for ultrasonic distance measuring under low signal-to-noise ratio and range finder thereof |
| CN101271084A (en) * | 2008-04-29 | 2008-09-24 | 河海大学常州校区 | Ultrasonic wave detecting system and method for centralized circulation type sulfur hexafluoride gas concentration |
| WO2009028591A1 (en) * | 2007-08-30 | 2009-03-05 | Nec Corporation | Ultrasonic wave propagation time measuring system |
| CN102183798A (en) * | 2011-01-30 | 2011-09-14 | 中国海洋石油总公司 | Measurement and control system of in-ocean towed multi-linear array acoustic positioning device |
| CN102590337A (en) * | 2012-02-02 | 2012-07-18 | 河海大学常州校区 | Acoustical method and device for detecting concentration of trace sulfur hexafluoride |
-
2012
- 2012-10-12 CN CN201210386237.9A patent/CN102889968B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2779398Y (en) * | 2005-02-28 | 2006-05-10 | 河海大学常州校区 | Transmitter for measuring gas concentration of sulfur hexafluoride |
| CN101021562A (en) * | 2006-11-20 | 2007-08-22 | 重庆大学 | Method for ultrasonic distance measuring under low signal-to-noise ratio and range finder thereof |
| WO2009028591A1 (en) * | 2007-08-30 | 2009-03-05 | Nec Corporation | Ultrasonic wave propagation time measuring system |
| US20100228523A1 (en) * | 2007-08-30 | 2010-09-09 | Nec Corporation | Ultrasonic wave propagation time measuring system |
| CN101271084A (en) * | 2008-04-29 | 2008-09-24 | 河海大学常州校区 | Ultrasonic wave detecting system and method for centralized circulation type sulfur hexafluoride gas concentration |
| CN102183798A (en) * | 2011-01-30 | 2011-09-14 | 中国海洋石油总公司 | Measurement and control system of in-ocean towed multi-linear array acoustic positioning device |
| CN102590337A (en) * | 2012-02-02 | 2012-07-18 | 河海大学常州校区 | Acoustical method and device for detecting concentration of trace sulfur hexafluoride |
Non-Patent Citations (4)
| Title |
|---|
| 张晓花 等: ""超声宽量程微量气体浓度检测的仿真研究"", 《声学技术》, vol. 27, no. 1, 29 February 2008 (2008-02-29) * |
| 朱昌平: ""流体中低浓度异质物含量的超声检测原理与应用研究"", 《中国博士学位论文全文数据库·工程科技Ⅰ辑》, no. 6, 15 June 2011 (2011-06-15) * |
| 路锦正 等: ""超声波测距仪的设计"", 《传感器技术》, vol. 21, no. 8, 31 August 2002 (2002-08-31) * |
| 韩春艳: "《大学物理实验》", 31 August 2008, article ""空气中声速的测定"" * |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954401A (en) * | 2014-04-09 | 2014-07-30 | 国家电网公司 | SF6 gas leakage locating insulation tape used for GIS |
| CN103994813A (en) * | 2014-04-28 | 2014-08-20 | 中国计量学院 | Small-diameter gas velocity measurement test device and test method thereof |
| CN105403369A (en) * | 2015-12-16 | 2016-03-16 | 深圳供电局有限公司 | Method and system for airtightness detection of GIS |
| CN107328528B (en) * | 2016-04-29 | 2023-11-07 | 国家电网公司 | Ultrasonic air tightness detection system and method based on multiple sensors |
| CN107328528A (en) * | 2016-04-29 | 2017-11-07 | 国家电网公司 | A kind of ultrasonic wave air tightness detection system and method based on multisensor |
| CN106052970A (en) * | 2016-07-27 | 2016-10-26 | 广西电网有限责任公司电力科学研究院 | Gas leakage detection system |
| CN106248148B (en) * | 2016-09-22 | 2019-10-22 | 深圳市润普科技有限公司 | Supersonic gas body sensor |
| CN106248148A (en) * | 2016-09-22 | 2016-12-21 | 深圳市润普科技有限公司 | Supersonic gas body sensor |
| CN109974939A (en) * | 2017-08-23 | 2019-07-05 | 福建中电合创电力科技有限公司 | A kind of method and system of the comprehensive detection SF6 leakage of detection |
| CN109974939B (en) * | 2017-08-23 | 2020-11-10 | 福建中电合创电力科技有限公司 | Method and system for comprehensively detecting SF6 leakage |
| CN107941428A (en) * | 2017-11-15 | 2018-04-20 | 哈尔滨工程大学 | One kind immersion tank body air-tightness automatic ultrasonic detecting system and detection method |
| CN112394106A (en) * | 2020-11-02 | 2021-02-23 | 珠海华瑞诚科技有限公司 | Distribution room system and SF6 gas concentration detection method |
| WO2022121771A1 (en) * | 2020-12-08 | 2022-06-16 | 重庆海尔制冷电器有限公司 | Method and device for inspecting reservoir |
| CN113295344A (en) * | 2021-04-28 | 2021-08-24 | 成都秦川物联网科技股份有限公司 | Method for detecting gas leakage by ultrasonic wave |
| CN116754641A (en) * | 2023-08-23 | 2023-09-15 | 湖北工业大学 | Hydrogen concentration detection device and method |
| CN116754641B (en) * | 2023-08-23 | 2023-11-14 | 湖北工业大学 | Hydrogen concentration detection device and method |
| CN117147067A (en) * | 2023-10-12 | 2023-12-01 | 国网湖北省电力有限公司超高压公司 | Electric equipment hidden danger detection method and system based on SF6 gas analysis |
| CN117147067B (en) * | 2023-10-12 | 2024-05-28 | 国网湖北省电力有限公司超高压公司 | Electric equipment hidden danger detection method and system based on SF6 gas analysis |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102889968B (en) | 2015-05-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102889968B (en) | Acoustical method for detecting low-concentration sulfur hexafluoride gas | |
| CN103913714B (en) | Calibration system of partial discharge supersonic detector | |
| CN201828554U (en) | Comprehensive evaluation device for sulfur hexafluoride electrical equipment | |
| CN201853104U (en) | Gas insulation combined electrical apparatus monitoring system | |
| CN203606277U (en) | Device for intelligently detecting ozone content of partial discharge of high-tension switch cabinet | |
| CN113030248B (en) | Hydrogen measurement system and method based on ultrasonic double-frequency phase difference | |
| CN100334444C (en) | Transmitter for measuring sulfur hexafluoride gas concentration and its measuring method | |
| CN102590337B (en) | Acoustical method and device for detecting concentration of trace sulfur hexafluoride | |
| WO2004053474A3 (en) | Gas detector for indicating failure of equipment or for monitoring ambient air | |
| CN202916229U (en) | Sulfur hexafluoride density micro-water monitoring device | |
| CN104535456A (en) | Novel sulfur hexafluoride gas density micro-water transmitter | |
| CN204346980U (en) | A kind of detector for SF6 gas concentration on-line monitoring | |
| CN109187738A (en) | A kind of sulfur hexafluoride gas detection device based on ultrasonic wave principle | |
| Karamchandani et al. | Pervasive monitoring of carbon monoxide and methane using air quality prediction | |
| CN105424904A (en) | Gunpowder gas ingredient testing system | |
| CN208888183U (en) | A kind of sulfur hexafluoride gas detection device based on ultrasonic wave principle | |
| CN106841533A (en) | Sulfur hexafluoride gas mass-synchrometer | |
| CN105044204B (en) | A kind of sulfur hexafluoride gas concentration detecting system and method based on ultrasound examination | |
| CN204461493U (en) | A kind of SF 6gas monitoring apparatus | |
| CN107064293A (en) | SF6 detectors and detection method, compensation method and method of work | |
| CN104833390A (en) | SF6 gas monitoring device | |
| CN2685880Y (en) | Sulfur hexafluoride gas on-line monitoring apparatus in high-voltage electrical equipment | |
| CN102778505A (en) | Wireless network-based acoustic method and device for detecting concentration of trace sulfur hexafluoride | |
| CN108562701A (en) | A kind of bromomethane density calculating method and detecting system | |
| CN204165859U (en) | The micro-water transmitter of a kind of novel sulfur hexafluoride gas density |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160901 Address after: 213000 West Lake Road, Wujin hi tech Industrial Development Zone, Jiangsu, China, No. 8, No. Patentee after: JIANGSU JOTRY ELECTRICAL TECHNOLOGY CO.,LTD. Address before: 213022 Jiangsu, North District, Changzhou Jin Ling North Road, No. 200 Patentee before: CHANGZHOU CAMPUS OF HOHAI University |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Acoustical method and device for detecting low-concentration sulfur hexafluoride gas Effective date of registration: 20171124 Granted publication date: 20150513 Pledgee: Bank of China Limited by Share Ltd. Changzhou Wujin branch Pledgor: JIANGSU JOTRY ELECTRICAL TECHNOLOGY CO.,LTD. Registration number: 2017320000052 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20181128 Granted publication date: 20150513 Pledgee: Bank of China Limited by Share Ltd. Changzhou Wujin branch Pledgor: JIANGSU JOTRY ELECTRICAL TECHNOLOGY CO.,LTD. Registration number: 2017320000052 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Acoustical method and device for detecting low-concentration sulfur hexafluoride gas Effective date of registration: 20181129 Granted publication date: 20150513 Pledgee: Bank of China Limited by Share Ltd. Changzhou Wujin branch Pledgor: JIANGSU JOTRY ELECTRICAL TECHNOLOGY CO.,LTD. Registration number: 2018320000335 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20191129 Granted publication date: 20150513 Pledgee: Bank of China Limited by Share Ltd. Changzhou Wujin branch Pledgor: JIANGSU JOTRY ELECTRICAL TECHNOLOGY CO.,LTD. Registration number: 2018320000335 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Acoustical method and device for detecting low-concentration sulfur hexafluoride gas Effective date of registration: 20191202 Granted publication date: 20150513 Pledgee: Bank of China Limited by Share Ltd. Changzhou Wujin branch Pledgor: JIANGSU JOTRY ELECTRICAL TECHNOLOGY CO.,LTD. Registration number: Y2019320000320 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220112 Granted publication date: 20150513 Pledgee: Bank of China Limited by Share Ltd. Changzhou Wujin branch Pledgor: JIANGSU JOTRY ELECTRICAL TECHNOLOGY CO.,LTD. Registration number: Y2019320000320 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |