CN102928383A - Device for measuring gas concentration through optical interference method - Google Patents
Device for measuring gas concentration through optical interference method Download PDFInfo
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- CN102928383A CN102928383A CN2012104354877A CN201210435487A CN102928383A CN 102928383 A CN102928383 A CN 102928383A CN 2012104354877 A CN2012104354877 A CN 2012104354877A CN 201210435487 A CN201210435487 A CN 201210435487A CN 102928383 A CN102928383 A CN 102928383A
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- photoelectric sensor
- beam expander
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Abstract
The invention provides a device for measuring gas concentration through an optical interference method. The device comprises an optical source, a cleft-tip-shaped gas chamber, a photoelectric sensor, a display device and a prompt device which are all arranged in a closed casing. The optical source comprises an optical source generator and a parallel optical beam expander which is arranged on an outgoing optical path of the optical source generator. The cleft-tip-shaped gas chamber is arranged in front of the parallel optical beam expander, and the photoelectric sensor is arranged at the gathering position of reflected light of the cleft-tip-shaped gas chamber and connected with the display device and the prompt device through signal lines. By means of the device, different interference fringes are generated due to optical path difference caused by different refractive indexes of an optical wave in gases with different concentration. The concentration of the gas is determined through the detection of the interference fringes. The device for measuring the gas concentration through the optical interference method has the advantages of being high in accuracy, wide in measurement range, easy to correct, simple, firm and durable.
Description
Technical field:
The invention belongs to optical measuring technique, be specifically related to a kind of optical gas surveying instrument.
Background technology:
Light wave can produce equal inclination fringe by different modes, and it is mainly used in the measurement of tiny length and refractive index.The demand of the measurement of gas concentration in commercial production and laboratory is very extensive, especially for the measurement of harmful gas.For example, the coal mine production safety detection system of China need to detect the toxic gas in the colliery.Product great majority up to now also all design for large coal mine, and self remain some problem demanding prompt solutions, as: equipment manufacturing cost is high, systems bulky, operation and maintenance cost is high, the sensor measurement poor stability, adjustment is frequent, serviceable life is short, and the device measuring precision is limited, must rely on the professional and safeguard.
Summary of the invention:
For above-mentioned deficiency, the applicant utilizes the splitter principle of interference, designs a kind of device that is applied to measurement gas (for example methane gas) concentration, and prior art equipment is complicated in order to overcome, unstable, the inconvenient problem with use of measurement.
Technical scheme of the present invention is as follows:
A kind of device of optical interferometry measure gas concentrations, comprise light source, splitter shape gas compartment, photoelectric sensor, display device and suggestion device, they all are contained in the sealing shell, prevent the impact of ambient light, the light that light source sends can not enter photoelectric sensor from undesirable direction affects measurement result.
Described light source comprises pointolite generator and parallel light beam expander, described parallel light beam expander is arranged on the emitting light path of pointolite generator, splitter shape gas compartment is set in parallel light beam expander the place ahead, the reflected light place of converging at splitter shape gas compartment arranges photoelectric sensor, and photoelectric sensor connects display and suggestion device by signal wire.
Described splitter shape gas compartment is one to form a triangular cavity by tilted-putted parallel plate and level crossing, and this cavity is used for filling gas to be measured.
The present invention utilizes light wave refractive index in the gas of variable concentrations different and the optical path difference that produces causes different interference fringes, by detecting interference fringe, realization is to the mensuration of gas concentration, and its advantage is that accuracy is high, and measurement range is wide, equipment is simple, sturdy and durable, proofreaies and correct easily.Carry gas concentration digital display system and many grades suggestion device, operation is directly perceived quick.
Description of drawings
Fig. 1 is the theory diagram of this device;
Fig. 2 is the structural representation of device.
Embodiment:
Describe this device in detail below in conjunction with accompanying drawing:
Whole device as depicted in figs. 1 and 2, this device comprises light source, splitter shape gas compartment 2, photoelectric sensor 3, display device 4 and suggestion device 6, each elementary cell integral body is fixed in the shell 9.Shell is airtight, prevents the impact of ambient light.
Described light source comprises pointolite generator 1 and parallel light beam expander 6, and parallel light beam expander 6 is arranged on the emitting light path of pointolite generator 1.
Splitter shape gas compartment 2 is arranged on parallel light beam expander 6 the place aheads, it is actual to be a cavity of propping between a dip-parallel glass plate 7 and the level crossing 8, and this cavity is used for filling gas to be measured, can be directly and test environment UNICOM, also gas to be measured can be packed into, then sealing.
The reflected light that photoelectric sensor 3 is arranged on splitter shape gas compartment converges the place, is used for the induction interference fringe, and the continually varying simulating signal is converted into stable digital signal.
The principle of this device: light source is launched the parallel beam with certain angle, behind the directional light process splitter shape gas compartment 2, so because there is optical path difference interference fringe to occur, arrive photoelectric sensor 3.Photoelectric sensor 3 is responded to interference fringes and signal is converted into stable digital signal.Light-emitting diode display 4 is collected digital signal, relies on the data analysis of existing database to calculate the concentration of gas to be measured afterwards, and delivers to the LED screen display out.If there are concrete needs when gas concentration arrives variable concentrations, automatically to provide corresponding prompting by apparatus for warning opening 5.
Use-pattern: if adopt this device to measure the concentration of specific gas in the specific environment, (for example, need to detect gas gas concentration in the coal mine) only need this device is placed coal mine atmosphere, the splitter shape gas compartment of device for opening, allow it be connected with extraneous air, Deng gas in gas compartment, spread stable after, open light source, parallel beam is directive splitter shape gas compartment 2 at a certain angle, reflection had both occured in 7 places at parallel plate, refraction has also occured, the direct directive photoelectric sensor 3 of light of reflection, refract light will pass through first gas to be measured, again by level crossing 8 propagation by reflection photoelectric sensors 3, through gas to be measured the time, because the gas of variable concentrations causes forming interference fringe through finally being entered the light beam of sensor and the different optical path difference of light appearance that directly enters sensor through reflection by parallel plate 7 refractions again after level crossing 8 reflections.Photoelectric sensor 3 reads and records these stripeds and variation thereof, again this striped variation is converted into stable digital signal and delivers to many grades suggestion device 5, many grades suggestion device 5 is compared this signal with predefined prompting threshold values, to determine mode and the state of prompting.
Claims (2)
1. the device of an optical interferometry measure gas concentrations, it is characterized in that: it comprises light source, splitter shape gas compartment (2), photoelectric sensor (3), display (4) and suggestion device (5), they all are contained in the sealing shell (9); Described light source comprises pointolite generator (1) and parallel light beam expander (6), described parallel light beam expander (6) is arranged on the emitting light path of pointolite generator (1), in parallel light beam expander (6) the place ahead splitter shape gas compartment (2) is set, at the reflected light place of converging of splitter shape gas compartment photoelectric sensor (3) is set, photoelectric sensor (3) connects display (4) and suggestion device (5) by signal wire.
2. the device of optical interferometry measure gas concentrations according to claim 1, it is characterized in that: described splitter shape gas compartment (2) is a triangular cavity that is formed by the level crossing (8) of tilted-putted parallel plate (7) and horizontal positioned, and this cavity is used for filling gas to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104354877A CN102928383A (en) | 2012-11-05 | 2012-11-05 | Device for measuring gas concentration through optical interference method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104354877A CN102928383A (en) | 2012-11-05 | 2012-11-05 | Device for measuring gas concentration through optical interference method |
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| Publication Number | Publication Date |
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| CN102928383A true CN102928383A (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012104354877A Pending CN102928383A (en) | 2012-11-05 | 2012-11-05 | Device for measuring gas concentration through optical interference method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411888A (en) * | 2013-08-27 | 2013-11-27 | 南京信息工程大学 | Gas concentration measuring method and measuring device |
| CN110749549A (en) * | 2019-11-22 | 2020-02-04 | 山东大学 | Device and method for monitoring components and concentration of malodorous gas |
| CN111504949A (en) * | 2020-05-11 | 2020-08-07 | 西南大学 | Fluid identification device based on interference method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3130636A1 (en) * | 1981-07-29 | 1983-02-17 | Siemens AG, 1000 Berlin und 8000 München | Optical method for monitoring the density of a fluid and device for carrying out the method |
| JP2000046737A (en) * | 1998-07-29 | 2000-02-18 | Taiheiyo Tanko Kk | Apparatus and method for measurement of concentration of gas |
| CN102305775A (en) * | 2011-08-31 | 2012-01-04 | 西安科技大学 | Optical measurement method for gas concentration of coal mines |
-
2012
- 2012-11-05 CN CN2012104354877A patent/CN102928383A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3130636A1 (en) * | 1981-07-29 | 1983-02-17 | Siemens AG, 1000 Berlin und 8000 München | Optical method for monitoring the density of a fluid and device for carrying out the method |
| JP2000046737A (en) * | 1998-07-29 | 2000-02-18 | Taiheiyo Tanko Kk | Apparatus and method for measurement of concentration of gas |
| CN102305775A (en) * | 2011-08-31 | 2012-01-04 | 西安科技大学 | Optical measurement method for gas concentration of coal mines |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411888A (en) * | 2013-08-27 | 2013-11-27 | 南京信息工程大学 | Gas concentration measuring method and measuring device |
| CN103411888B (en) * | 2013-08-27 | 2016-01-20 | 南京信息工程大学 | A kind of gas concentration measuring method and measurement mechanism |
| CN110749549A (en) * | 2019-11-22 | 2020-02-04 | 山东大学 | Device and method for monitoring components and concentration of malodorous gas |
| CN111504949A (en) * | 2020-05-11 | 2020-08-07 | 西南大学 | Fluid identification device based on interference method |
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Application publication date: 20130213 |