CN201075083Y - Sulfur hexafluoride gas concentration detecting instrument - Google Patents
Sulfur hexafluoride gas concentration detecting instrument Download PDFInfo
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- CN201075083Y CN201075083Y CNU2007201733503U CN200720173350U CN201075083Y CN 201075083 Y CN201075083 Y CN 201075083Y CN U2007201733503 U CNU2007201733503 U CN U2007201733503U CN 200720173350 U CN200720173350 U CN 200720173350U CN 201075083 Y CN201075083 Y CN 201075083Y
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- sulfur hexafluoride
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Abstract
The utility model discloses a sulfur hexafluoride gas consistency detector, comprising a shell and a detection circuit inside the shell. The shell is provided with a gas diffusion inlet. The detection circuit comprises an infrared sulphur hexafluoride sensor, a prepositive amplifying unit, a bandpass filter unit, a light source driving unit and a singlechip. Two I/O terminals of the singlechip are connected with the light source signal input terminal of the light source driving unit; the light source signal output terminal of the light source driving unit is connected with the signal input terminal of the infrared sulfux hexafluoride sensor; the signal output terminal of the infrared sulfux hexafluoride sensor is connected with a signal input terminal of the prepositive amplifying unit; the signal output terminal of the prepositive amplifying unit is connected with the signal input terminal of the bandpass filter unit; the signal output terminal of the bandpass filter unit is connected with the other two I/O terminals of the singlechip. The utility model has the advantages of small volume, hand-held, high sensitiveness, low power loss, easy batch production, low cost, convenient and reliable application with the measurement range of 100% vol.
Description
Technical field
The utility model relates to a kind of sulfur hexafluoride gas concentration pick-up unit, specifically, relates to a kind of infrared sulfur hexafluoride gas concentration detector of hand-held wide-range.
Background technology
Generally, known sulfur hexafluoride (SF
6) maximum range of gas concentration detector is less, only is several thousand ppm.As, Chinese utility model patent " sulfur hexafluoride gas leak locator " (patent No.: ZL 96222357.3) discloses a kind of sulfur hexafluoride gas leak locator.This leak locator comprises sensor, power circuit, oscillatory circuit, signal Processing amplifying circuit and signal display circuit, described sensor comprises cavity, quartz glass plate is divided into light source chamber and sampling chamber two parts with this cavity, light-source chamber is indoor to be provided with ultraviolet mercury lamp, the indoor gauze screen that is provided with of sampling cavity, the accelerating electrode net, the surface is coated with the sheet metal of gold layer, the top of two correspondences up and down at the sampling chamber is provided with air intake opening and exhausr port, air intake opening dedusting before pipe is connected with successively assembly that dries, the detected gas suction nozzle, exhausr port dedusting after pipe is connected with successively assembly that dries, pulsation cushion chamber and air pump, air pump is provided with exhausr port, sheet metal is provided with extension line, accelerating electrode is provided with extension line on the net, and this extension line is connected with the signal Processing amplifying circuit.This leak locator is widely used in and detects the electric equipment leakage situation that is filled with sulfur hexafluoride gas, but the range of this instrument is less.
Yet the sulfur hexafluoride gas concentration that some special occasions need detect is very high, analyzes as sulfur hexafluoride gas production unit, colliery cranny development, under these occasions, needs to use the sulfur hexafluoride gas concentration detector of wide range.But the volume of present wide range sulfur hexafluoride gas concentration detecting instrument is all huger, is unsuitable for hand-held the measurement.
The utility model content
The purpose of this utility model is to provide a kind of sulfur hexafluoride gas concentration detector, and the detection range of this detector is big, and volume is little, hand-holdable use.
To achieve these goals, the utility model is by the following technical solutions:
A kind of sulfur hexafluoride gas concentration detector, it comprises the testing circuit in shell and the shell, shell is provided with the gaseous diffusion inlet, it is characterized in that: described testing circuit comprises infrared sulfur hexafluoride sensor, pre-amplifier unit, the bandpass filtering unit, light source driving units and single-chip microcomputer, wherein: the light signal input end of two described light source driving units of I/O termination of described single-chip microcomputer, the signal input part of the described infrared sulfur hexafluoride sensor of light signal output termination of described light source driving units, the signal output part of described infrared sulfur hexafluoride sensor connects the signal input part of described pre-amplifier unit, the signal output part of described pre-amplifier unit connects the signal input part of described bandpass filtering unit, and the signal output part of described bandpass filtering unit connects two I/O ends in addition of described single-chip microcomputer.
Described infrared sulfur hexafluoride sensor comprises two infrarede emitting diodes, infrared eye, air chamber, catoptron, metal filter screen, air chamber is a tubular, the bottom of this air chamber becomes concave spherical surface, the middle part of this air chamber is the face of cylinder, top ports place at air chamber is connected with metal filter screen, be provided with catoptron at the metal filter screen rear portion, it is parabolic that the inside surface of this catoptron is, infrarede emitting diode and infrared eye are positioned at same plane, air chamber bottom and are that rotational symmetry is placed with the air chamber center line, infrared eye is by cylindrical case, infrared sensor, every tabula rasa, optical filter and saturating window are formed, be located at the infrared eye centerline of cylindrical case every tabula rasa, two infrared sensors are symmetrically distributed in every the tabula rasa both sides, and place the bottom of cylindrical case, respectively as probe unit and reference unit, the front end of the cylindrical case of infrared eye is provided with the saturating window of sealing, paste the characteristic wave bands of sulfur hexafluoride gas and two transmission filters of non-characteristic wave bands wavelength respectively on saturating window inside surface detector center line both sides, outer end, bottom at air chamber is provided with the pin welding substrate, connects the modulation of source signal input part that to have two infrarede emitting diodes on the pin welding substrate, the power end of two infrared sensors and signal output part;
Described light source driving units is provided with two groups, every group comprises a high speed photo coupling and a constant voltage driving chip, in every group, one input end of high speed photo coupling and an I/O of described single-chip microcomputer end join, one output terminal of high speed photo coupling and the input end of constant voltage driving chip join, and a signal input part of the output terminal of constant voltage driving chip and described infrared sulfur hexafluoride sensor joins;
Described pre-amplifier unit is two amplifiers, and the in-phase input end of each amplifier joins through a signal output part of electric capacity and described infrared sulfur hexafluoride sensor;
Described bandpass filtering unit is two amplifiers, the output terminal of the amplifier of the in-phase input end of each amplifier in electric capacity and described pre-amplifier unit joins, and two I/O ends in addition of the output terminal of these two amplifiers of described bandpass filtering unit and described single-chip microcomputer join.
During use, press shift knob, power supply power supply is placed on the place of sulfur hexafluoride gas to be measured with detector, and sulfur hexafluoride gas enters in the housing from the gaseous diffusion inlet.Single-chip microcomputer sends alternately modulation signal to two infrarede emitting diodes, and the light that infrarede emitting diode sends is received by the infrared sensor of reference unit and probe unit through catoptron, thereby two infrared sensors output voltage signal in the single-chip microcomputer.Single-chip microcomputer calculates the ratio of reference signal and detectable signal by plug-in, thus the gas concentration of drawing, and the concentration value that draws is stored in the storage chip, and demonstrate by 4 figure place sign indicating number displays.If the sulfur hexafluoride gas concentration that records surpasses setting value, then send the warning that exceeds standard, alarm lamp lights, and hummer sounds.
The utility model has the advantages that:
1, infrared sulfur hexafluoride sensor has adopted the detection principle of non-isolated reflection air chamber and two light source Lazers sensing unit, has solved the disadvantage of existing infrared double detector gas sensor detecting element mismatch, has reduced volume.And when reducing volume, make detection accuracy improve one more than the order of magnitude.
2, because the testing circuit volume is little, low in energy consumption, highly sensitive, thus the utlity model has little, hand-holdable, highly sensitive, the easy batch process of volume, advantage that cost is low, and it measures range and can reach 100%vol, and easy to use and reliable.
Description of drawings
Fig. 1 is the schematic perspective view of the utility model detector;
Fig. 2 is the light path synoptic diagram of infrared sulfur hexafluoride sensor;
Fig. 3 is the main TV structure synoptic diagram of infrared sulfur hexafluoride sensor;
Fig. 4 is that air chamber is looked on the right side of Fig. 3 and infrared eye partly cuts open structural representation;
Fig. 5 is that infrared eye partly cuts open the structure for amplifying synoptic diagram;
Fig. 6 is the infrared eye left side TV structure synoptic diagram of Fig. 5;
Fig. 7 is that the A-A of Fig. 3 is to structural representation;
Fig. 8 is the pre-amplifier unit in the testing circuit and the circuit theory diagrams of bandpass filtering unit;
Fig. 9 is the circuit theory diagrams of the light source driving units in the testing circuit;
Figure 10 is the single-chip microcomputer in the testing circuit and the circuit theory diagrams of storage unit;
Figure 11 is the circuit theory diagrams of the alarm unit in the testing circuit;
Figure 12 is the circuit theory diagrams of the display unit in the testing circuit.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
To shown in Figure 12, the utility model sulfur hexafluoride gas concentration detector comprises the testing circuit in shell 1 and the shell 1 as Fig. 1, and shell 1 is provided with gaseous diffusion inlet 2.Testing circuit comprises infrared sulfur hexafluoride sensor, pre-amplifier unit, bandpass filtering unit, light source driving units and single-chip microcomputer U10.Two I/O end P07/XT1 of single-chip microcomputer U10, P10/XT2 respectively with the light signal input end T0 of light source driving units, T1 joins, the light signal output terminal lamp1 of light source driving units, lamp2 joins with a signal input part 23 of infrared sulfur hexafluoride sensor respectively, two signal output parts 15 of infrared sulfur hexafluoride sensor respectively with the signal input part ACT of pre-amplifier unit, REF joins, the signal output part ACTOUT of pre-amplifier unit, REFOUT respectively with the signal input part ACTIN of bandpass filtering unit, REFIN joins, the signal output part ACT0 of bandpass filtering unit, REF0 respectively with in addition two I/O end P02 of single-chip microcomputer U10, P01 joins.
To shown in Figure 7, infrared sulfur hexafluoride sensor comprises two infrarede emitting diodes 8,9, infrared eye 10, air chamber 11, catoptron 12, metal filter screen 13 as Fig. 3.Air chamber 11 is a tubular, the bottom of this air chamber 11 becomes concave spherical surface 22, the middle part of this air chamber 11 is the face of cylinder, top ports place at air chamber 11 is connected with metal filter screen 13, be provided with catoptron 12 at metal filter screen 13 rear portions, it is parabolic that the inside surface of this catoptron 12 is, and infrarede emitting diode 8,9 and infrared eye 10 are positioned at same plane, air chamber 11 bottoms, and be the rotational symmetry placement with air chamber 11 center lines. Infrarede emitting diode 8,9 places the focus place at 11 ends of concave spherical surface air chamber as far as possible, and effect is that infrared light reflection with scattering is to catoptron 12.Infrared eye 10 is by cylindrical case 20, infrared sensor 16, every tabula rasa 17, optical filter 18 and saturating window 19 are formed, be located at infrared eye 10 centerline of cylindrical case 20 every tabula rasa 17, two infrared sensors 16 are symmetrically distributed in every tabula rasa 17 both sides, and place the bottom of cylindrical case 20, respectively as probe unit and reference unit, the front end of the cylindrical case 20 of infrared eye 10 is provided with the saturating window 19 of sealing, pastes the characteristic wave bands of sulfur hexafluoride gas and two transmission filters 18 of non-characteristic wave bands wavelength respectively on saturating window 19 inside surface detector center line both sides.Outer end, bottom at air chamber 11 is provided with pin welding substrate 14, connects the modulation of source signal input part 23 that to have two infrarede emitting diodes 8,9, the power end 21 and the signal output part 15 of two infrared sensors 16 on pin welding substrate 14.
As Fig. 8, shown in Figure 10, pre-amplifier unit is two amplifier U2A and U2B, the in-phase input end of each amplifier joins through a signal output part of electric capacity and infrared sulfur hexafluoride sensor, the in-phase input end that is amplifier U2A joins via a capacitor C 2 and a signal output part 15, it is as the signal input part ACT of pre-amplifier unit, the in-phase input end of amplifier U2B joins via capacitor C 5 and another signal output part 15, and it is as the signal input part REF of pre-amplifier unit.The bandpass filtering unit is two amplifier U3A and U3B, and the output terminal of the amplifier of the in-phase input end of each amplifier in electric capacity and pre-amplifier unit joins.The output terminals A CTOUT of amplifier U2A joins via the in-phase input end of capacitor C 27 with amplifier U3A, and the output terminal REFOUT of amplifier U2B joins via the in-phase input end of capacitor C 29 with amplifier U3B.Two amplifier U3A of bandpass filtering unit and output terminals A CT0, the REF0 of U3B join with I/O end P02, the P01 of single-chip microcomputer U10 respectively.Single-chip microcomputer U10 selects the single-chip microcomputer of C8051F531 model for use.
As shown in Figure 9, light source driving units is provided with two groups, and every group comprises a high speed photo coupling TLP113 and a constant voltage driving chip I RF9410.In every group, one input end of high speed photo coupling and the I/O of single-chip microcomputer U10 end join, be that the input end T0 (being pin 1) of high speed photo coupling U4 and the I/O end P07/XT1 of single-chip microcomputer U10 join, the input end T1 of high speed photo coupling U5 (being pin 1) and the I/O end P10/XT2 of single-chip microcomputer U10 join.The output terminal of high speed photo coupling U4 and U5 (being pin 4) joins with the input end (being pin 1～4) of constant voltage driving chip U6, U7 respectively, and the output terminal lamp2 (being pin 5～8) of the output terminal lamp1 of constant voltage driving chip U6 (being pin 5～8) and constant voltage driving chip U7 joins with a signal input part 23 of infrared sulfur hexafluoride sensor respectively.
As shown in figure 10, testing circuit also comprises storage unit, detects data to be used for storage.This storage unit is a storage chip U12 (selecting AT24C02 model chip for use), and two input end SCL, the SDA of this storage chip U12 meet I/O end P16, the P17 of single-chip microcomputer U10 respectively.
As shown in figure 11, testing circuit also comprises alarm unit, and this alarm unit is divided into light alarm unit harmony alarm unit.The light alarm unit is composed in series by a triode Q1 and an alarm lamp Lamp (being 4 among Fig. 1), and the base stage of triode Q1 is joined with the I/O end P14 of single-chip microcomputer U10 as the input end S0 of alarm unit.The acoustic alarm unit is composed in series by a triode Q2 and a hummer BELL (being 3 among Fig. 1), and the base stage of triode Q2 is joined with the I/O end P15 of single-chip microcomputer U10 as the input end S1 of alarm unit.Alarm lamp Lamp and hummer BELL are arranged on the shell 1.
As shown in figure 12, testing circuit also comprises display unit, and this display unit is made up of a charactron display driver U8 and one 4 figure place sign indicating number display U9.Three input end DIN, the LOAD of charactron display driver U8 and CLK meet I/O end P11, P12, the P13 of single-chip microcomputer U10 respectively.Output terminal DIG0～3 of charactron display driver U8 and SEGA～G join with input end dig1～4, the A～G of nixie display U9 respectively.Nixie display U9 (being 5 among Fig. 1) is arranged on the shell 1, is used to show the concentration of sulfur hexafluoride value that records.
As Fig. 1 and shown in Figure 10, also be provided with reset button 6 (being the K1 among Figure 10) and shift knob 7 (being the K2 among Figure 10) on the shell 1.Reset button 6 is used for resetting of single-chip microcomputer U10.
In addition, according to actual needs, the utility model also can be provided with the RS232 serial interface circuit, to be used to realize the real-time communication of detector and computing machine.
Below, specifically set forth principle of work of the present utility model:
Major parameter among Fig. 2 is: the light intensity of two infrarede emitting diode LED1, LED2 (being 8 among Fig. 3,9) is respectively I
r, I
m, the responsiveness of two infrared sensors is respectively R
r, R
m, the projection of tested sulfur hexafluoride gas is than being τ
a, and the transmittance of air chamber is τ
0The optical filter that is attached to reference unit 1 is the arrowband transmission filter of centre wavelength away from tested sulfur hexafluoride gas characteristic absorption peak, and the optical filter that is attached on the probe unit 2 is the arrowband transmission filter of the corresponding tested sulfur hexafluoride gas characteristic absorption peak of centre wavelength.
The transmittance of supposing gas is τ
aThe transmittance of air chamber is τ
0, when infrarede emitting diode LED1 sent pulsed light, the output voltage of reference unit infrared sensor 16 and probe unit infrared sensor 16 was respectively:
V
rr＝I
rR
r (1)
V
rm＝I
rR
mτ
aτ
0 (2)
When driving infrarede emitting diode LED2 sent pulsed light, the output voltage of reference unit infrared sensor 16 and probe unit infrared sensor 16 was respectively:
V
mr＝I
mR
r (3)
V
mm＝I
mR
mτ
aτ
0 (4)
As from the foregoing, infrared sensor will produce one with responsiveness and emissive porwer irrelevant and and τ
a 2τ
0 2The signal that is directly proportional.
The voltage signal that reference unit infrared sensor 16 and probe unit infrared sensor 16 obtain is imported (by P02 and P01 input) in the single-chip microcomputer U10 from signal output part 15 via the filtering of the amplification of pre-amplifier unit, bandpass filtering unit, by the inner A/D converter conversion of single-chip microcomputer, after the related software analysis and judgement, draw the factor K relevant with gas concentration value by following formula (5):
By formula (5) as can be known, survey gas concentration, can effectively eliminate infrarede emitting diode luminous power (I with the mode of two infrared sensors, two light sources
r, I
m) unsettled influence and infrared sensor responsiveness (R
r, R
m) unsettled influence.After having eliminated I, R influence, signal only with the transmittance τ of tested sulfur hexafluoride gas
aTransmittance τ with air chamber
0(because attenuation that optical device and dust cause) is relevant, can reduce drift like this and eliminate the influence of dust and steam, reduces source of error, the raising measuring accuracy.Light path design becomes reflective advantage to be: infrared energy passes tested gas for twice, has guaranteed suitable optical path distance in smaller size smaller, has also improved accuracy of detection.Because reference path and to measure light path be to work under same environment, the potential difference (PD) ratio of getting both compares, and has just avoided changing the drift that causes because of environmental change and sensitive element responsiveness.
After the factor K that is drawn by formula (5) calculated gas concentration value, single-chip microcomputer U10 was stored in concentration value among the storage chip AT24C02 of storage unit by I/O port P16, P17, and 4 figure place sign indicating number display U9 display density numerical value by display unit.If the sulfur hexafluoride gas concentration that records surpasses setting value, then single-chip microcomputer U10 sends the alarm command that sulfur hexafluoride gas exceeds standard, and makes alarm lamp Lamp luminous, and hummer BELL sounds.
The utility model has the advantages that:
1, it is former that infrared sulfur hexafluoride sensor has adopted the detection of non-isolated reflection air chamber and two light source sensitive elements Reason has solved the disadvantage that has infrared double detector gas sensor detecting element mismatch now, has reduced volume. And When reducing volume, make detection accuracy improve one more than the order of magnitude.
2, since the testing circuit volume little, low in energy consumption, highly sensitive, so the utlity model has volume little, can Hand-held, highly sensitive, easy batch production, the advantage that adult is low, and it measures range and can reach 100%vol, makes With convenient and reliable.
Claims (6)
1. sulfur hexafluoride gas concentration detector, it comprises the testing circuit in shell and the shell, shell is provided with the gaseous diffusion inlet, it is characterized in that: described testing circuit comprises infrared sulfur hexafluoride sensor, pre-amplifier unit, bandpass filtering unit, light source driving units and single-chip microcomputer, wherein:
The light signal input end of two described light source driving units of I/O termination of described single-chip microcomputer, the signal input part of the described infrared sulfur hexafluoride sensor of light signal output termination of described light source driving units, the signal output part of described infrared sulfur hexafluoride sensor connects the signal input part of described pre-amplifier unit, the signal output part of described pre-amplifier unit connects the signal input part of described bandpass filtering unit, and the signal output part of described bandpass filtering unit connects two I/O ends in addition of described single-chip microcomputer.
2. sulfur hexafluoride gas concentration detector according to claim 1 is characterized in that:
Described infrared sulfur hexafluoride sensor comprises two infrarede emitting diodes, infrared eye, air chamber, catoptron, metal filter screen, air chamber is a tubular, the bottom of this air chamber becomes concave spherical surface, the middle part of this air chamber is the face of cylinder, top ports place at air chamber is connected with metal filter screen, be provided with catoptron at the metal filter screen rear portion, it is parabolic that the inside surface of this catoptron is, infrarede emitting diode and infrared eye are positioned at same plane, air chamber bottom and are that rotational symmetry is placed with the air chamber center line, infrared eye is by cylindrical case, infrared sensor, every tabula rasa, optical filter and saturating window are formed, be located at the infrared eye centerline of cylindrical case every tabula rasa, two infrared sensors are symmetrically distributed in every the tabula rasa both sides, and place the bottom of cylindrical case, respectively as probe unit and reference unit, the front end of the cylindrical case of infrared eye is provided with the saturating window of sealing, paste the characteristic wave bands of sulfur hexafluoride gas and two transmission filters of non-characteristic wave bands wavelength respectively on saturating window inside surface detector center line both sides, outer end, bottom at air chamber is provided with the pin welding substrate, connects the modulation of source signal input part that to have two infrarede emitting diodes on the pin welding substrate, the power end of two infrared sensors and signal output part;
Described light source driving units is provided with two groups, every group comprises a high speed photo coupling and a constant voltage driving chip, in every group, one input end of high speed photo coupling and an I/O of described single-chip microcomputer end join, one output terminal of high speed photo coupling and the input end of constant voltage driving chip join, and a signal input part of the output terminal of constant voltage driving chip and described infrared sulfur hexafluoride sensor joins;
Described pre-amplifier unit is two amplifiers, and the in-phase input end of each amplifier joins through a signal output part of electric capacity and described infrared sulfur hexafluoride sensor;
Described bandpass filtering unit is two amplifiers, the output terminal of the amplifier of the in-phase input end of each amplifier in electric capacity and described pre-amplifier unit joins, and two I/O ends in addition of the output terminal of these two amplifiers of described bandpass filtering unit and described single-chip microcomputer join.
3. sulfur hexafluoride gas concentration detector according to claim 1 and 2, it is characterized in that: described detector also comprises storage unit, this storage unit is a storage chip AT24C02, two other I/O end of two described single-chip microcomputers of input termination of this storage chip.
4. sulfur hexafluoride gas concentration detector according to claim 1 and 2, it is characterized in that: described detector also comprises alarm unit, this alarm unit is divided into light alarm unit harmony alarm unit, the light alarm unit is composed in series by a triode and an alarm lamp, the acoustic alarm unit is composed in series by a triode and a hummer, the base stage of two triodes is two input ends of alarm unit, two other I/O end of these two the described single-chip microcomputers of input termination, this alarm lamp and hummer are arranged on the described shell.
5. sulfur hexafluoride gas concentration detector according to claim 1 and 2, it is characterized in that: described detector also comprises display unit, this display unit is made up of a charactron display driver and a nixie display, other three I/O end of three described single-chip microcomputers of input termination of this charactron display driver, the input end of the output termination nixie display of this charactron display driver, this nixie display is arranged on the described shell.
6. sulfur hexafluoride gas concentration detector according to claim 1 is characterized in that: also be provided with shift knob and reset button on the described shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201733503U CN201075083Y (en) | 2007-09-25 | 2007-09-25 | Sulfur hexafluoride gas concentration detecting instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201733503U CN201075083Y (en) | 2007-09-25 | 2007-09-25 | Sulfur hexafluoride gas concentration detecting instrument |
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| Publication Number | Publication Date |
|---|---|
| CN201075083Y true CN201075083Y (en) | 2008-06-18 |
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|---|---|---|---|
| CNU2007201733503U Expired - Fee Related CN201075083Y (en) | 2007-09-25 | 2007-09-25 | Sulfur hexafluoride gas concentration detecting instrument |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074094A (en) * | 2011-01-14 | 2011-05-25 | 北华航天工业学院 | Security early-warning prompting system for bridges |
| CN102446412A (en) * | 2011-10-14 | 2012-05-09 | 合肥海尔空调器有限公司 | Remote controller with gas detection function and method for gas detection by using same |
| CN102661834A (en) * | 2011-12-30 | 2012-09-12 | 昆山和智电气设备有限公司 | High sensitive multipath SF6 on-line leak detector and detection method thereof |
| CN103353471A (en) * | 2013-07-29 | 2013-10-16 | 张伟 | Device for measuring air pollution |
| CN110687066A (en) * | 2019-09-17 | 2020-01-14 | 中国科学院上海微系统与信息技术研究所 | Infrared gas sensor |
-
2007
- 2007-09-25 CN CNU2007201733503U patent/CN201075083Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074094A (en) * | 2011-01-14 | 2011-05-25 | 北华航天工业学院 | Security early-warning prompting system for bridges |
| CN102446412A (en) * | 2011-10-14 | 2012-05-09 | 合肥海尔空调器有限公司 | Remote controller with gas detection function and method for gas detection by using same |
| CN102661834A (en) * | 2011-12-30 | 2012-09-12 | 昆山和智电气设备有限公司 | High sensitive multipath SF6 on-line leak detector and detection method thereof |
| CN102661834B (en) * | 2011-12-30 | 2015-09-09 | 昆山和智电气设备有限公司 | The online leak locator of high sensitive multipath SF6 and detection method thereof |
| CN103353471A (en) * | 2013-07-29 | 2013-10-16 | 张伟 | Device for measuring air pollution |
| CN110687066A (en) * | 2019-09-17 | 2020-01-14 | 中国科学院上海微系统与信息技术研究所 | Infrared gas sensor |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080618 Termination date: 20130925 |