CN106706858A - Gas concentration automatic detection system and detection method thereof - Google Patents
Gas concentration automatic detection system and detection method thereof Download PDFInfo
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- CN106706858A CN106706858A CN201710030084.7A CN201710030084A CN106706858A CN 106706858 A CN106706858 A CN 106706858A CN 201710030084 A CN201710030084 A CN 201710030084A CN 106706858 A CN106706858 A CN 106706858A
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- 238000001514 detection method Methods 0.000 title claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 44
- 238000004891 communication Methods 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 238000004364 calculation method Methods 0.000 claims abstract description 3
- 230000009467 reduction Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 7
- 229910003445 palladium oxide Inorganic materials 0.000 claims description 7
- JQPTYAILLJKUCY-UHFFFAOYSA-N palladium(ii) oxide Chemical compound [O-2].[Pd+2] JQPTYAILLJKUCY-UHFFFAOYSA-N 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 abstract 1
- 239000003054 catalyst Substances 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000009841 combustion method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
- G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0057—Warfare agents or explosives
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
- G01N33/0063—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display using a threshold to release an alarm or displaying means
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
The invention discloses a gas concentration automatic detection system which comprises a gas sampling module, a heating detection module, a control module and a communication module, wherein the gas sampling module is used for sampling gas in the detection environment; the heating detection module is used for carrying out heating detection on the gas sample and acquiring the temperature of a measuring element; the control module is used for calculating the gas concentration by calculating the temperature of the measuring element; and the communication module is used for outputting an alarm signal according to the calculation result of the control module. The invention also discloses a detection method of the gas concentration automatic detection system. The system can improve the defects in the prior art, and enhances the gas detection precision by a combustion process.
Description
Technical field
The present invention relates to gas management technical field, especially a kind of gas density automatic checkout system and its detection side
Method.
Background technology
In the roadway of colliery, gas density reaches 5~16% and will explode, and causes explosion of coal mines accident, national safety supervision
Gas explosion is the main source of coal mining accident in the accident that general bureau announces.Gas management is broadly divided into combustion-type and infrared spectrum
Two kinds of formula, the spectroscopic methodology detection gas degree of accuracy is high, but instrument and equipment volume is larger, relatively costly, confined condition in practical application
It is more.Although combustion-type detects gas equipment simple structure, accuracy of detection is poor.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of gas density automatic checkout system and its detection method, can
The deficiencies in the prior art are solved, the accuracy that combustion method detects gas is improve.
In order to solve the above technical problems, the technical solution used in the present invention is as follows.
A kind of gas density automatic checkout system, including,
Gas sampling module, for being sampled to the gas in detection environment；
Heating detection module, for carrying out heating detection to gas sample, gathers the temperature of measuring cell；
Control module, by the calculating to measuring cell temperature, calculates gas density；
Communication module, the result of calculation according to control module carries out the output of alarm signal.
Preferably, the heating detection module includes heating chamber, two heating plates are provided with heating chamber, heated
Chamber roof is provided with air inlet, and heating chamber bottom is provided with gas outlet, and air inlet bottom is provided with annular catch, annular gear
Piece inner side is provided with guide vane, and guide vane is 16 ° with the axis angle of annular catch, and pair is provided with the outside of guide vane
Blade, back blades is located at below annular catch, and the inner side of guide vane sets jagged, and the windward side of breach is provided with beveling
Face, is evenly arranged with several through holes on annular catch；Heater plate surface is provided with toothed region, and heating plate is internally provided with heating
Silk, toothed region top surface is provided with oven wire mesh blanket, and toothed region bottom is provided with temperature sensor.
Preferably, the heating plate is internally provided with cavity, cavity bottom is provided with heat-insulating bracket, and heater strip is arranged on
On heat-insulating bracket, heat-conducting metal bar is provided between heater strip and the top of cavity, heat-conducting metal bar sets with the contact surface of cavity
Guiding gutter is equipped with, guiding gutter lower section is provided with fin, and the bottom surface of cavity is provided with reflecting layer.
Preferably, the receiver module, for receiving the control signal that control module sends；
Modulation module, the control signal for that will receive carries out treatment and is loaded into carrier wave；
Noise reduction module, for being filtered to the interference in transmission signal；
Demodulation module, for original signal will to be recovered in modulated signal.
Preferably, the input of the noise reduction module is connected by first resistor, the first electric capacity and the second electric capacity connected
The normal phase input end of the first amplifier is connected to, by the 3rd capacity earth between first resistor and the first electric capacity, first resistor and the
The base stage of triode is connected between one electric capacity by second resistance, the colelctor electrode of triode is connected to the first electric capacity and the second electricity
Between appearance, the emitter stage of triode is connected to the output end of the first amplifier, the output end connection of the first amplifier by 3rd resistor
To the output end of noise reduction module, the normal phase input end of the first amplifier is by the 4th resistance eutral grounding, and the positive input of the first amplifier is logical
The output end that the 5th resistance is connected to the first amplifier is crossed, the inverting input of the first amplifier is by the 6th resistance eutral grounding, the first fortune
The inverting input put is connected to the output end of the first amplifier by the 7th resistance.
A kind of detection method of above-mentioned gas density automatic checkout system, comprises the following steps：
A, palladium oxide is coated on measuring cell, using gas sampling module to injecting measurement gas sample in heating detection module
This, heats to measuring cell；
The temperature data that B, control module receive the same time is arranged according to different test positions, forms three dimensional temperature point
Butut；
C, effective temperature point is drawn using three dimensional temperature distribution map；The T/L of effective temperature point is maximum, and T is effective temperature point
Temperature, L is the distance between effective temperature point and other temperature spots sum；
D, temperature time curve is formed sequentially in time using each effective temperature point, by the measurement unit for being coated with palladium oxide
Temperature change on part, calculates the gas density in sample gas.
The beneficial effect brought using above-mentioned technical proposal is：The present invention is by setting control module to detection data
Be analyzed treatment, be then transmitted by communication module, improve for methane Concentration Measurement precision and be transmitted across
The interference rejection capability of journey.The structure of heating chamber can improve dispersed homogeneous degree of the gas in heating chamber, heating plate table
The tooth-shape structure in face can effective guard catalyst, the heat transmission that its internal heating arrangement can provide high evenness leads to
Road, so that intensification uniformity when improving catalyst with gas generation catalytic reaction.Data communication uses the mode of carrier communication,
The noise of transmission data can be reduced, the efficiency of transmission of transmission channel is improved.Noise reduction module can be using it for noise frequency
Feedback inhibition, play a part of noise reduction.Control module by measuring cell palladium oxide occur catalytic reaction when each
Point for measuring temperature, is then calculated by the optimization for temperature, obtains an accurate gas density result.
Brief description of the drawings
Fig. 1 is a structure chart for specific embodiment of the invention.
Fig. 2 is the structure chart of heating chamber in a specific embodiment of the invention.
Fig. 3 is the structure chart of heating chamber air outlet in a specific embodiment of the invention.
Fig. 4 is the structure chart of heating plate in a specific embodiment of the invention.
Fig. 5 is the structure chart of noise reduction module in a specific embodiment of the invention.
Specific embodiment
The standardized element used in the present invention can commercially, and shaped piece is according to specification and accompanying drawing
Record can carry out customized, and the specific connected mode of each part is using ripe in the prior art bolt, rivet, weldering
The conventional meanses such as connect, paste, will not be described in detail herein.
Reference picture 1-5, one specific embodiment of the present invention includes gas sampling module 1, in detection environment
Gas is sampled；Heating detection module 2, for carrying out heating detection to gas sample, gathers the temperature of measuring cell；Control
Module 3, by the calculating to measuring cell temperature, calculates gas density；Communication module 4, the calculating knot according to control module 3
Fruit carries out the output of alarm signal.Heating detection module 2 includes being provided with two heating in heating chamber 201, heating chamber 201
Plate 202, the top of heating chamber 201 is provided with air inlet 204, and the bottom of heating chamber 201 is provided with gas outlet 205, air inlet 204
Bottom is provided with annular catch 219, and the inner side of annular catch 219 is provided with guide vane 206, guide vane 206 and annular catch
219 axis angle is 16 °, and the outside of guide vane 206 is provided with back blades 207, and back blades 207 is located at annular catch 219
Below, the inner side of guide vane 206 sets jagged 208, and the windward side of breach 208 is provided with scarf 209, annular catch
Several through holes 203 are evenly arranged with 219；The surface of heating plate 202 is provided with toothed region 210, and heating plate 202 is internally provided with
Heater strip 211, the top surface of toothed region 210 is provided with oven wire mesh blanket 212, and the bottom of toothed region 210 is provided with temperature sensor 213.
Heating plate 202 is internally provided with cavity 214, and the bottom of cavity 214 is provided with heat-insulating bracket 215, and heater strip 211 is arranged on heat-insulated branch
On frame 215, heat-conducting metal bar 215, heat-conducting metal bar 215 and cavity are provided between the top of heater strip 211 and cavity 214
214 contact surface is provided with guiding gutter 216, and the lower section of guiding gutter 216 is provided with fin 217, and the bottom surface of cavity 214 is provided with reflection
Layer 218.Communication module 4 includes, receiver module 41, for receiving the control signal that control module 3 sends；Modulation module 42, uses
Treatment is carried out in the control signal that will be received to be loaded on carrier wave；Noise reduction module 43, for entering to the interference in transmission signal
Row filtering；Demodulation module 44, for original signal will to be recovered in modulated signal.
The input IN of the noise reduction module 43 is connected by the first resistor R1, the first electric capacity C1 that connect and the second electric capacity C2
The normal phase input end of the first amplifier A1 is connected to, is grounded by the 3rd electric capacity C3 between first resistor R1 and the first electric capacity C1, first
The base stage of triode Q is connected between resistance R1 and the first electric capacity C1 by second resistance R2, the colelctor electrode of triode Q is connected to
Between first electric capacity C1 and the second electric capacity C2, the emitter stage of triode Q is connected to the defeated of the first amplifier A1 by 3rd resistor R3
Go out and hold OUT, the output end of the first amplifier A1 is connected to the output end of noise reduction module 43, and the normal phase input end of the first amplifier A1 passes through
4th resistance R4 is grounded, and the positive input of the first amplifier A1 is connected to the output end of the first amplifier A1 by the 5th resistance R5, the
The inverting input of one amplifier A1 is grounded by the 6th resistance R6, and the inverting input of the first amplifier A1 is connected by the 7th resistance R7
It is connected to the output end of the first amplifier A1.
The normal phase input end of the second amplifier A2 is connected between first resistor R1 and the first electric capacity C1 by the 8th resistance R8,
The normal phase input end of the second amplifier A2 is grounded by the 4th electric capacity C4, and the inverting input of the second amplifier A2 passes through the 9th resistance R9
The output end of the second amplifier A2 is connected to, the inverting input of the second amplifier A2 is connected to the first amplifier by the tenth resistance R10
The output end of A1, the output end of the second amplifier A2 is connected to the inverting input of the first amplifier A1.
Wherein, first resistor R1 is that 5.5k Ω, second resistance R2 are that 12 k Ω, 3rd resistor R3 are 3.5 k Ω, the 4th electricity
Resistance R4 is that 10 k Ω, the 5th resistance R5 are that 5.5 k Ω, the 6th resistance R6 are that 8.5 k Ω, the 7th resistance R7 are 15 k Ω, the 8th
Resistance R8 is that 6.5 k Ω, the 9th resistance R9 are that 1.5 k Ω, the tenth resistance R10 are 7 k Ω.First electric capacity C1 is 320 μ F, second
Electric capacity C2 is that 500 μ F, the 3rd electric capacity C3 are that 450 μ F, the 4th electric capacity C4 are 660 μ F.
A kind of detection method of above-mentioned gas density automatic checkout system, comprises the following steps：
A, palladium oxide is coated on measuring cell, using gas sampling module 1 to injecting measurement gas sample in heating detection module 2
This, heats to measuring cell；
The temperature data that B, control module 3 receive the same time is arranged according to different test positions, forms three dimensional temperature
Distribution map；
C, effective temperature point is drawn using three dimensional temperature distribution map；The T/L of effective temperature point is maximum, and T is effective temperature point
Temperature, L is the distance between effective temperature point and other temperature spots sum；
D, temperature time curve is formed sequentially in time using each effective temperature point, by the measurement unit for being coated with palladium oxide
Temperature change on part, calculates the gas density in sample gas.
Control module 3 is smoothed to temperature time curve, and the highest number of times of the curvilinear equation after treatment is no more than 5
It is secondary.Several curved sections are chosen on curve after treatment, the selection standard of curved section is：On curved section between the tangent line of each point
Angle be respectively less than 10 °, and the duration that curved section is crossed over is no more than 10s.
Temperature value is weighted averagely using curved section, obtains temperature averages, temperature in use average value is dense to gas
Degree is calculated.The computational methods of the weighted value of temperature are：
W=k/c*[(Tmax-T)-(T-Tmin)]2
Wherein, W is weighted value, and k is proportionality coefficient, and c is sampled point curvature, and T is sampled point temperature, TmaxIt is the maximum temperature of curved section
Angle value, TminIt is curved section minimum temperature value.
The present invention can effectively improve the precision that combustion method detects gas density.
General principle of the invention and principal character and advantages of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not limited to the above embodiments, simply explanation described in above-described embodiment and specification this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appending claims and its
Equivalent thereof.
Claims (6)
1. a kind of gas density automatic checkout system, it is characterised in that：Including,
Gas sampling module（1）, for being sampled to the gas in detection environment；
Heating detection module（2）, for carrying out heating detection to gas sample, gather the temperature of measuring cell；
Control module（3）, by the calculating to measuring cell temperature, calculate gas density；
Communication module（4）, according to control module（3）Result of calculation carry out the output of alarm signal.
2. gas density automatic checkout system according to claim 1, it is characterised in that：The heating detection module（2）
Including heating chamber（201）, heating chamber（201）Inside it is provided with two heating plates（202）, heating chamber（201）Top is set
There is air inlet（204）, heating chamber（201）Bottom is provided with gas outlet（205）, air inlet（204）Bottom is provided with annular gear
Piece（219）, annular catch（219）Inner side is provided with guide vane（206）, guide vane（206）With annular catch（219）Axle
Wire clamp angle is 16 °, guide vane（206）Outside be provided with back blades（207）, back blades（207）Positioned at annular catch（219）
Below, guide vane（206）Inner side set it is jagged（208）, breach（208）Windward side be provided with scarf（209）,
Annular catch（219）On be evenly arranged with several through holes（203）；Heating plate（202）Surface is provided with toothed region（210）, plus
Hot plate（202）It is internally provided with heater strip（211）, toothed region（210）Top surface is provided with oven wire mesh blanket（212）, toothed region
（210）Bottom is provided with temperature sensor（213）.
3. gas density automatic checkout system according to claim 2, it is characterised in that：The heating plate（202）It is internal
It is provided with cavity（214）, cavity（214）Bottom is provided with heat-insulating bracket（215）, heater strip（211）Installed in heat-insulating bracket
（215）On, heater strip（211）With cavity（214）Top between be provided with heat-conducting metal bar（220）, heat-conducting metal bar（220）
With cavity（214）Contact surface be provided with guiding gutter（216）, guiding gutter（216）Lower section is provided with fin（217）, cavity（214）
Bottom surface be provided with reflecting layer（218）.
4. according to the gas density automatic checkout system described in claim 1, it is characterised in that：The communication module（4）Including,
Receiver module（41）, for receiving control module（3）The control signal for sending；
Modulation module（42）, the control signal for that will receive carries out treatment and is loaded into carrier wave；
Noise reduction module（43）, for being filtered to the interference in transmission signal；
Demodulation module（44）, for original signal will to be recovered in modulated signal.
5. according to the gas density automatic checkout system described in claim 4, it is characterised in that：The noise reduction module（43）Input
End（IN）By the first resistor connected（R1）, the first electric capacity（C1）With the second electric capacity（C2）It is connected to the first amplifier（A1）Just
Phase input, first resistor（R1）With the first electric capacity（C1）Between pass through the 3rd electric capacity（C3）Ground connection, first resistor（R1）With
One electric capacity（C1）Between pass through second resistance（R2）It is connected to triode（Q）Base stage, triode（Q）Colelctor electrode be connected to
One electric capacity（C1）With the second electric capacity（C2）Between, triode（Q）Emitter stage pass through 3rd resistor（R3）It is connected to the first amplifier
（A1）Output end, the first amplifier（A1）Output end be connected to noise reduction module（43）Output end（OUT）, the first amplifier（A1）
Normal phase input end pass through the 4th resistance（R4）Ground connection, the first amplifier（A1）Positive input pass through the 5th resistance（R5）It is connected to
First amplifier（A1）Output end, the first amplifier（A1）Inverting input pass through the 6th resistance（R6）Ground connection, the first amplifier
（A1）Inverting input pass through the 7th resistance（R7）It is connected to the first amplifier（A1）Output end.
6. the detection method of the gas density automatic checkout system described in a kind of claim 1-5 any one, it is characterised in that
Comprise the following steps：
A, palladium oxide is coated on measuring cell, use gas sampling module（1）To heating detection module（2）Interior injection measurement gas
Body sample, heats to measuring cell；
B, control module（3）The temperature data that the same time is received is arranged according to different test positions, forms three-dimensional temperature
Degree distribution map；
C, effective temperature point is drawn using three dimensional temperature distribution map；The T/L of effective temperature point is maximum, and T is effective temperature point
Temperature, L is the distance between effective temperature point and other temperature spots sum；
D, temperature time curve is formed sequentially in time using each effective temperature point, by the measurement unit for being coated with palladium oxide
Temperature change on part, calculates the gas density in sample gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710030084.7A CN106706858B (en) | 2017-01-17 | 2017-01-17 | A kind of gas density automatic checkout system and its detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710030084.7A CN106706858B (en) | 2017-01-17 | 2017-01-17 | A kind of gas density automatic checkout system and its detection method |
Publications (2)
| Publication Number | Publication Date |
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| CN106706858A true CN106706858A (en) | 2017-05-24 |
| CN106706858B CN106706858B (en) | 2019-10-25 |
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| CN201710030084.7A Expired - Fee Related CN106706858B (en) | 2017-01-17 | 2017-01-17 | A kind of gas density automatic checkout system and its detection method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1588030A (en) * | 2004-07-09 | 2005-03-02 | 大连理工大学 | Portable gas detection analyzer with temperature and humidity compensation function |
| US20060219552A1 (en) * | 2005-04-04 | 2006-10-05 | Takashi Sasaki | Gas sensor |
| CN101660781A (en) * | 2008-08-29 | 2010-03-03 | 乐金电子(天津)电器有限公司 | Microwave oven |
| CN103184886A (en) * | 2011-12-30 | 2013-07-03 | 国家纳米技术与工程研究院 | Measuring component of MEMS (Micro-electromechanical Systems) technology-based gas alarm and preparation method of measuring component |
| CN104240449A (en) * | 2014-09-18 | 2014-12-24 | 天津市浦海新技术有限公司 | Detection alarm |
| CN105699430A (en) * | 2016-03-28 | 2016-06-22 | 南通理工学院 | Multifunctional gas concentration detector |
-
2017
- 2017-01-17 CN CN201710030084.7A patent/CN106706858B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1588030A (en) * | 2004-07-09 | 2005-03-02 | 大连理工大学 | Portable gas detection analyzer with temperature and humidity compensation function |
| US20060219552A1 (en) * | 2005-04-04 | 2006-10-05 | Takashi Sasaki | Gas sensor |
| CN101660781A (en) * | 2008-08-29 | 2010-03-03 | 乐金电子(天津)电器有限公司 | Microwave oven |
| CN103184886A (en) * | 2011-12-30 | 2013-07-03 | 国家纳米技术与工程研究院 | Measuring component of MEMS (Micro-electromechanical Systems) technology-based gas alarm and preparation method of measuring component |
| CN104240449A (en) * | 2014-09-18 | 2014-12-24 | 天津市浦海新技术有限公司 | Detection alarm |
| CN105699430A (en) * | 2016-03-28 | 2016-06-22 | 南通理工学院 | Multifunctional gas concentration detector |
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| Publication number | Publication date |
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| CN106706858B (en) | 2019-10-25 |
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