CN202599822U - Gas detector - Google Patents
Gas detector Download PDFInfo
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- CN202599822U CN202599822U CN 201220057241 CN201220057241U CN202599822U CN 202599822 U CN202599822 U CN 202599822U CN 201220057241 CN201220057241 CN 201220057241 CN 201220057241 U CN201220057241 U CN 201220057241U CN 202599822 U CN202599822 U CN 202599822U
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Abstract
The utility model provides a gas detector, which comprises a sample gas chamber and a first detection circuit board for detecting gas concentration. An inlet and an outlet for gas to be detected are arranged on the sample gas chamber. The gas detector additionally comprises a laser, a detector, a first wiring terminal and a second wiring terminal, wherein the laser and the detector are respectively arranged at the two ends of the sample gas chamber and the detector is used for receiving a laser beam which is transmitted by the laser; the input end of the first wiring terminal is connected with the laser through a laser connecting wire and the output end of the first wiring terminal is connected with the first detection circuit board; and the input end of the second wiring terminal is connected with the detector through a detector connecting wire and the output end of the second wiring terminal is connected with the first detection circuit board. Since the laser spectrum width of the laser beam which is transmitted by the laser in the gas detector is smaller than 0.0001nm and is far below the spectrum width of an absorption spectrum line of the gas to be detected, the goal of avoiding the interference of other gases in the background during gas detection is realized and the detection accuracy is further improved.
Description
Technical field
The utility model relates to concentration, the temperature of gas, the detection technique field of pressure and other parameters, more particularly, relates to a kind of gas detecting instrument.
Background technology
At present, the gas detecting instrument of domestic employing adopts traditional catalytic combustion-type technological, and it mainly is applicable to the detection of inflammable gas, and the catalytic combustion type gas detector is to utilize the resistance variations after the refractory metal platinum filament heats to measure combustable gas concentration.When inflammable gas gets into detector, cause oxidation reaction (flameless burning) on the platinum filament surface, the heat of its generation raises the temperature of platinum filament, and the resistivity of platinum filament just changes.The size of the resistance variations through measuring platinum filament just can obtain the concentration of inflammable gas.
But, when utilizing this catalytic combustion type gas detector detected gas, require must contain in the environment enough combustion-supporting oxygen; If oxygen level is low excessively; Can cause the deviation of reading, its measuring accuracy is low, and in inert gas or other oxygenless gas environment, can't use.Simultaneously, this gas detecting instrument also has poor work stability, and reading is prone to drift, lacks, needs frequent deadly defects such as calibration serviceable life.In addition, when tested gas halide, sulphur, phosphorus or arsenic, can cause the permanent or temporary poisoning of gas detecting instrument, and then cause its thorough damage.
In order to overcome the above-mentioned shortcoming of catalytic combustion-type technology; Some companies have developed based on infrared ray absorbing type Flammable Gas Detector; The infrared-gas detector is a kind of based on the characteristic of gas with various molecule to the absorption of infrared spectrum selectivity, utilizes gas concentration and the relation (being lambert-Bill Lambert-Beer law) that absorbs infra-red intensity to come the gas sensing device of measure gas concentrations.Compare with the catalytic combustion type gas detector, it does not need the combustion-supporting of oxygen, but have be widely used, long service life, highly sensitive, good stability, be fit to that gas is many, the low on-line analysis of maintenance cost or the like series of advantages.But,, except the absorption line of tested gas, also have the absorption line of a lot of other background gas in its spectrum width scope because the light source bands of a spectrum that the infrared spectrum absorption techniques is adopted are very wide.The light that light source sends is also absorbed by the absorption line of some background gas except being absorbed by many absorption lines of gas to be measured.Therefore, this infrared-gas detector is vulnerable to the interference of other gas in the background when detected gas, for example under the big abominable industrial environment of water capacity, and water vapor in the tested gas and CO
2Concentration can have a strong impact on the accuracy of measurement of infrared gas detector, thereby has reduced the accuracy of measuring.
In sum, how a kind of gas detecting instrument being provided, not receiving the interference of other gas in the background in the process that is implemented in its detected gas, and then improving the accuracy of measuring, is the technical matters that present those skilled in the art need to be resolved hurrily.
The utility model content
In view of this, the purpose of the utility model is to provide a kind of gas detecting instrument, not receiving the interference of other gas in the background in the process that is implemented in its detected gas, and then improves the accuracy of measuring.
In order to achieve the above object, the utility model provides following technical scheme:
A kind of gas detecting instrument comprises the first testing circuit plate of kind air chamber and detected gas concentration, and said appearance air chamber is provided with the import and the outlet of gas to be measured, and this gas detecting instrument also comprises:
Be separately positioned on the laser instrument and the detector that receives the laser beam that said laser instrument sends at the two ends of said appearance air chamber;
First connection terminal that input end links to each other with said laser instrument through the laser instrument line, the output terminal of this first connection terminal links to each other with the said first testing circuit plate;
Second connection terminal that input end links to each other with said detector through the detector line, the output terminal of this second connection terminal links to each other with the said first testing circuit plate.
Preferably, in the above-mentioned gas detector, the inflow point of said appearance air chamber also is provided with screen pack.
Preferably, in the above-mentioned gas detector, said appearance air chamber is a rectangular housing, is provided with said import on three sides of this rectangular housing.
Preferably, in the above-mentioned gas detector, said appearance air chamber is a cylindrical housings, is provided with said import on the circumferencial direction of this cylindrical housings.
Preferably, in the above-mentioned gas detector, also be provided with the sensor that can detect the temperature and pressure of said gas to be measured on the said appearance air chamber; With
The 3rd connection terminal that input end links to each other with the output terminal of said sensor, and the output terminal of said the 3rd connection terminal is connected with the second testing circuit plate.
Preferably, in the above-mentioned gas detector, the outlet of said gas to be measured is the pore that is arranged on the said appearance air chamber, and said sensor is arranged on the top of said pore and the position that is connected with said pore.
Preferably, in the above-mentioned gas detector, the said second testing circuit plate is arranged on the roof of said appearance air chamber through screw, and said the 3rd connection terminal and said sensor are separately positioned on the end face and bottom surface of the said second testing circuit plate.
In the gas detecting instrument that the utility model provides; The first testing circuit plate that comprises kind air chamber and detected gas concentration; Said appearance air chamber is provided with the import and the outlet of gas to be measured, and this gas detecting instrument also comprises: the laser instrument and the detector that receives the laser beam that said laser instrument sends that are separately positioned on the two ends of said appearance air chamber; First connection terminal that input end links to each other with said laser instrument through the laser instrument line, the output terminal of this first connection terminal links to each other with the said first testing circuit plate; Second connection terminal that input end links to each other with said detector through the detector line, the output terminal of this second connection terminal links to each other with the said first testing circuit plate.
The gas detecting instrument that the utility model provides is based on the development of laser spectrum principle of absorption, and the process of its detected gas is following:
At first, the import of gas to be measured from said appearance air chamber fed in it, discharge from its outlet then; When it passes said kind of air chamber; Said laser instrument sends beam of laser, through gas to be measured, is received by said detector then; In this process, tested gas can carry out selectivity to the light of specific wavelength in the laser spectrum and absorb; This laser absorption principle comes from classical Lambert-Beer's law, and promptly tested component has absorbability to the light of specific wavelength, and absorption intensity is directly proportional with concentration of component; The signal of following said laser instrument and detector is transferred to the input end of said first connection terminal and said second connection terminal respectively through said laser instrument line and said detector line; Signal after said then first connection terminal and said second connection terminal will be handled passes to the said first testing circuit plate respectively through output terminal separately; Can calculate the light intensity of the specific wavelength of tested gas composition absorption through the data of the said first testing circuit plate, thereby calculate the concentration of gas composition.
Because the light source bands of a spectrum that the infrared spectrum absorption techniques that traditional gas detecting instrument is used is adopted are very wide, except the absorption line of tested gas, also has the absorption line of a lot of other background gas in its spectrum width scope.Therefore, the light that light source sends is also absorbed by the absorption line of some background gas except being absorbed by many absorption lines of gas to be measured, thereby has caused the inaccuracy of measuring.
And the spectrum width of the semiconductor laser that uses in the laser absorption spectrum technology that the gas detecting instrument that the utility model provides is used is less than 0.0001nm, much smaller than the spectrum width of an absorption line of tested gas.When selecting this absorption line, just guarantee near selected absorption line frequency the absorption line of background gas component in the no measurement environment, disturb thereby avoided these background gas components that the intersection of tested gas is absorbed, improved the accuracy of measurement.
In sum, the gas detecting instrument that the utility model provides has realized in the process of its detected gas, not receiving the interference of other gas in the background, and then has improved the accuracy of measuring.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the partial schematic sectional view of the part-structure of the gas detecting instrument that provides of the utility model embodiment one;
Fig. 2 is the perspective view of the parts 6 among Fig. 1;
Fig. 3 is the partial schematic sectional view of the part-structure of the gas detecting instrument that provides of the utility model embodiment two;
Fig. 4 is the part-structure schematic perspective view of the gas detecting instrument that provides of the utility model embodiment two.
Embodiment
The interference that the utility model embodiment provides a kind of gas detecting instrument to realize in the process of its detected gas, not receiving other gas in the background, and then improved the accuracy of measuring.
For the purpose, technical scheme and the advantage that make the utility model embodiment clearer; To combine the accompanying drawing among the utility model embodiment below; Technical scheme among the utility model embodiment is carried out clear, intactly description; Obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment one:
Please refer to accompanying drawing 1-2, Fig. 1 is the partial schematic sectional view of the part-structure of the gas detecting instrument that provides of the utility model embodiment one; Fig. 2 is the perspective view of the parts 6 among Fig. 1; Wherein, the direction of arrow among Fig. 2 is the direction of tested gas flow.
In the gas detecting instrument that the utility model embodiment one provides; The first testing circuit plate that comprises kind air chamber 6 and detected gas concentration; Appearance air chamber 6 is provided with the import and the outlet of gas to be measured, and this gas detecting instrument also comprises: the laser instrument 7 and the detector 4 that receives the laser beam that laser instrument 7 sends that are separately positioned on the two ends of kind air chamber 6; First connection terminal 1 that input end links to each other with laser instrument 7 through laser instrument line I, the output terminal of this first connection terminal 1 links to each other with the first testing circuit plate; Second connection terminal 2 that input end links to each other with detector 4 through detector line II, the output terminal of this second connection terminal 2 links to each other with the first testing circuit plate.
The gas detecting instrument that present embodiment provides is based on the development of laser spectrum principle of absorption, and the process of its detected gas is following:
At first, the import of gas to be measured from appearance air chamber 6 fed in it, discharge from its outlet then; When it passes kind air chamber 6; Laser instrument 7 sends beam of laser, through gas to be measured, is received by detector 4 then; In this process, tested gas can carry out selectivity to the light of specific wavelength in the laser spectrum and absorb; This laser absorption principle comes from classical Lambert-Beer's law, and promptly tested component has absorbability to the light of specific wavelength, and absorption intensity is directly proportional with concentration of component; Then the signal of laser instrument 7 and detector 4 is transferred to the input end of first connection terminal 1 and second connection terminal 2 respectively through laser instrument line I and detector line II; Signal after first connection terminal 1 and second connection terminal 2 will be handled then passes to the first testing circuit plate through output terminal separately; Can calculate the light intensity of the specific wavelength of tested gas composition absorption through the data of the first testing circuit plate, thereby calculate the concentration of gas composition.
Because the light source bands of a spectrum that the infrared spectrum absorption techniques that traditional gas detecting instrument is used is adopted are very wide, except the absorption line of tested gas, also has the absorption line of a lot of other background gas in its spectrum width scope.Therefore, the light that light source sends is also absorbed by the absorption line of some background gas except being absorbed by many absorption lines of gas to be measured, thereby has caused the inaccuracy of measuring.
And the spectrum width of the semiconductor laser that uses in the laser absorption spectrum technology that the gas detecting instrument that present embodiment provides is used is less than 0.0001nm, much smaller than the spectrum width of an absorption line of tested gas.When selecting this absorption line, just guarantee near selected absorption line frequency the absorption line of background gas component in the no measurement environment, disturb thereby avoided these background gas components that the intersection of tested gas is absorbed, improved the accuracy of measurement.
In sum, the gas detecting instrument that present embodiment provides has realized in the process of its detected gas, not receiving the interference of other gas in the background, and then has improved the accuracy of measuring.Moreover because laser has outstanding compensation ability, some disturb for example temperature and dust, are easy to be removed, and the accuracy of measuring further is provided.Simultaneously, the gas detecting instrument that present embodiment provides need not consumptive material, n.s. waste, no chemical contamination; Advantage with environmental protection and energy saving, and analysis speed fast (second level), simple to operate, can reach real-time detection; And can be used in the various environment and comprise bad working environment, operating cost is low, almost Maintenance free; Need not periodic calibrating, also can carry out remote monitoring and complete saving historical data.
When to the gas in the bad working environment; When for example the methane gas in the colliery detects; Owing to possibly contain impurity such as dust in the tested methane; So screen pack 5 need be set in the inflow point of appearance air chamber 6,, reduce the influence of impurity to testing result to play effect to tested gas filtration.
Concrete; In the gas detecting instrument that the foregoing description provides; In order to reduce first connection terminal 1 and the shared volumetric spaces of second connection terminal 2, both also can use same connection terminal, only adopt the distinct interface of this connection terminal to realize its different functions requirement.
In the present embodiment, appearance air chamber 6 can be rectangular housing, is provided with import on three sides of this rectangular housing at this moment; Appearance air chamber 6 also can be cylindrical housings; Be provided with import on the circumferencial direction of this cylindrical housings at this moment; Certainly appearance air chamber 6 is not limited to above-mentioned two kinds of shapes; Its entrance location is not done qualification yet, as long as can realize being positioned at the laser instrument 7 at kind air chamber 6 two ends and the function that detector 4 can transmit and receive laser.
Embodiment two:
Please refer to accompanying drawing 3-4, Fig. 3 is the part-structure synoptic diagram of the gas detecting instrument that provides of the utility model embodiment two; Fig. 4 is the part-structure schematic perspective view of the gas detecting instrument that provides of the utility model embodiment two.
In order in the process that detects tested gas concentration, to detect the temperature and pressure of tested gas simultaneously; In the gas detecting instrument that the utility model embodiment two provides; On the basis of the gas detecting instrument that the utility model embodiment one provides, also be provided with the sensor 8 of the temperature and pressure that can detect gas to be measured on the above-mentioned appearance air chamber 6; With, the 3rd connection terminal 3 that input end links to each other with the output terminal of sensor 8, and the output terminal of the 3rd connection terminal 3 is connected with the second testing circuit plate 9.
When being connected with tested gas in the appearance air chamber 6, sensor 8 with detected temperature signal and pressure signal all through the 3rd connection terminal 3 pass to the second testing circuit plate 9 again, host CPU this moment (central processing unit) can output temperature value and force value.
Concrete, in the gas detecting instrument that present embodiment provides, the outlet of gas to be measured is the pore 61 that is arranged on kind air chamber 6, and sensor 8 is arranged on the top of pore 61 and the position that is connected with pore 61., sensor 8 can also be arranged on other positions certainly, but must must satisfy under the prerequisite of the temperature and pressure that can detect tested gas.
Preferably, in the gas detecting instrument that present embodiment provides, the second testing circuit plate 9 is arranged on the roof of kind air chamber 6 through screw, and the 3rd connection terminal 3 is separately positioned on the end face and bottom surface of the second testing circuit plate 9 with sensor 8.Saved taking up room of this gas detecting instrument.
The above only is the preferred implementation of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection domain of the utility model.
Claims (7)
1. gas detecting instrument comprises the first testing circuit plate of a kind air chamber (6) and detected gas concentration, and said appearance air chamber (6) is provided with the import and the outlet of gas to be measured, it is characterized in that this gas detecting instrument also comprises:
Be separately positioned on the detector (4) of the laser beam that laser instrument (7) and the said laser instrument of reception (7) at the two ends of said appearance air chamber (6) send;
First connection terminal (1) that input end links to each other with said laser instrument (7) through laser instrument line (I), the output terminal of this first connection terminal (1) links to each other with the said first testing circuit plate;
Second connection terminal (2) that input end links to each other with said detector (4) through detector line (II), the output terminal of this second connection terminal (2) links to each other with the said first testing circuit plate.
2. gas detecting instrument according to claim 1 is characterized in that, the inflow point of said appearance air chamber (6) also is provided with screen pack (5).
3. gas detecting instrument according to claim 2 is characterized in that, said appearance air chamber (6) is a rectangular housing, is provided with said import on three sides of this rectangular housing.
4. gas detecting instrument according to claim 2 is characterized in that, said appearance air chamber (6) is a cylindrical housings, is provided with said import on the circumferencial direction of this cylindrical housings.
5. gas detecting instrument according to claim 1 is characterized in that, also is provided with the sensor (8) that can detect the temperature and pressure of said gas to be measured on the said appearance air chamber (6); With
The 3rd connection terminal (3) that input end links to each other with the output terminal of said sensor (8), and the output terminal of said the 3rd connection terminal (3) is connected with the second testing circuit plate (9).
6. gas detecting instrument according to claim 5; It is characterized in that; The outlet of said gas to be measured is the pore (61) that is arranged on the said appearance air chamber (6), and said sensor (8) is arranged on the top of said pore (61) and the position that is connected with said pore (61).
7. gas detecting instrument according to claim 6; It is characterized in that; The said second testing circuit plate (9) is arranged on the roof of said appearance air chamber (6) through screw, and said the 3rd connection terminal (3) and said sensor (8) are separately positioned on the end face and bottom surface of the said second testing circuit plate (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220057241 CN202599822U (en) | 2012-02-20 | 2012-02-20 | Gas detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220057241 CN202599822U (en) | 2012-02-20 | 2012-02-20 | Gas detector |
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| Publication Number | Publication Date |
|---|---|
| CN202599822U true CN202599822U (en) | 2012-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220057241 Expired - Lifetime CN202599822U (en) | 2012-02-20 | 2012-02-20 | Gas detector |
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|---|---|
| CN (1) | CN202599822U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109187343A (en) * | 2018-08-31 | 2019-01-11 | 中煤科工集团重庆研究院有限公司 | Laser methane probe for gas drainage pipeline |
| CN109211786A (en) * | 2018-08-31 | 2019-01-15 | 中煤科工集团重庆研究院有限公司 | Correlation type spectrum gas absorption cell |
| CN111855610A (en) * | 2020-06-30 | 2020-10-30 | 武汉六九传感科技有限公司 | Two-dimensional gas detection device and three-dimensional gas detection device |
| CN112577924A (en) * | 2020-12-04 | 2021-03-30 | 华能国际电力股份有限公司德州电厂 | Carbon monoxide, hydrogen sulfide and oxygen monitoring system of power generation boiler |
-
2012
- 2012-02-20 CN CN 201220057241 patent/CN202599822U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109187343A (en) * | 2018-08-31 | 2019-01-11 | 中煤科工集团重庆研究院有限公司 | Laser methane probe for gas drainage pipeline |
| CN109211786A (en) * | 2018-08-31 | 2019-01-15 | 中煤科工集团重庆研究院有限公司 | Correlation type spectrum gas absorption cell |
| CN111855610A (en) * | 2020-06-30 | 2020-10-30 | 武汉六九传感科技有限公司 | Two-dimensional gas detection device and three-dimensional gas detection device |
| CN112577924A (en) * | 2020-12-04 | 2021-03-30 | 华能国际电力股份有限公司德州电厂 | Carbon monoxide, hydrogen sulfide and oxygen monitoring system of power generation boiler |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |