CN207147963U - A kind of device of detection gas concentration - Google Patents
A kind of device of detection gas concentration Download PDFInfo
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- CN207147963U CN207147963U CN201721070505.0U CN201721070505U CN207147963U CN 207147963 U CN207147963 U CN 207147963U CN 201721070505 U CN201721070505 U CN 201721070505U CN 207147963 U CN207147963 U CN 207147963U
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- light
- gas concentration
- air chamber
- spectroscope
- film
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Abstract
The utility model proposes a kind of device of detection gas concentration, including optical transmitting set, spectroscope, air chamber, right-angle prism and photoelectric detector, the optical transmitting set transmitting incident light is in 45 ° of irradiation spectroscopes, the spectroscope light entrance face is arranged at intervals with part reflective semitransparent film, another side is provided with the film that is all-trans, and the air chamber is divided into two reference air chambers of both sides and middle sample gas air chamber through two pieces of dividing plates；The top half of one right-angle side of the right-angle prism or the latter half are provided with refractive index and are more than the dielectric reflection film or metallic reflective coating of itself, and the remainder of right-angle side is provided with refractive index and is less than the reflectance coating of right-angle prism in itself.Compared with the existing gas concentration detection apparatus based on optical absorption, the device has the characteristics of test limit is low, high resolution, can effective detection low content gas concentration value.
Description
Technical field
The utility model belongs to gas concentration detection field, more particularly to one kind is based on optical absorption and interferometry gas
The device of bulk concentration.
Background technology
In current contamination source and air in specific gas detection, the instrument detected based on optical absorption principle is substantially
It is all based on Lambert-Beer's law.Its principle is that part light energy is by sample by detecting the light of specific wavelength after sample gas
Specific components in gas are absorbed, and the primary power of the light that light source sends is detected as reference light first with photoelectric detector,
Then detect that the outgoing light energy after sample aspiration, and reference light can calculate sample gas to spy after calculating is compared
The absorbance of standing wave length.The absorbing wavelength of gas with various is different, according to Lambert-Beer's law, in absorbance size and sample gas with
The concentration of harmful gas component corresponding to wavelength is directly proportional, therefore the absorbance change for calculating by meter specific wavelength can be with
Calculate corresponding harmful gas concentration.
With the enhancing of people's environmental consciousness, and the deep cognition to pernicious gas harm, the detection of gas concentration will
Also more and more higher is sought, detection device need to accurately detect the concentration value of lower loading gas.However, when to be measured in sample gas
When gas concentration is relatively low, gas absorbance very little, therefore absorbed light energy accounting very little, i.e., tested gas concentration information light
Signal energy accounting is small, and the sensitivity of spectrometer, dynamic range and signal to noise ratio are limited, so that the luminous energy that tested gas absorbs
Noise size on numerical quantity close to spectrometer in itself, the signal to noise ratio of photosignal is very low caused by tested gas, so can
The gas concentration detection limit for height of realization, and concentration resolution is low, it is difficult to meet what current environmental monitoring proposed to pollutant concentration
The requirement of more low detection limits and higher resolution.
Utility model content
The utility model is directed to above-mentioned technical problem, proposes that one kind is based on light absorbs principle, and combine the gas of interferometric method
Bulk concentration detection means, the device can greatly improve the resolution of detecting instrument under the situation using existing photoelectric detector
Rate and detection limit performance, the concentration of effective detection low content gas.
In order to achieve the above object, the technical solution adopted in the utility model is：
A kind of device of detection gas concentration, including optical transmitting set, spectroscope, air chamber, right-angle prism and photoelectric detector,
The optical transmitting set transmitting incident light is in 45 ° of irradiation spectroscopes, and the spectroscope light entrance face is arranged at intervals with part reflective semitransparent film,
Another side is provided with the film that is all-trans, and the air chamber is divided into two reference air chambers of both sides and middle sample gas gas through two pieces of dividing plates
Room；The top half of one right-angle side of the right-angle prism or the latter half are provided with refractive index and are more than the medium of itself
Reflectance coating or metallic reflective coating, the remainder of right-angle side are provided with refractive index and are less than the reflectance coating of right-angle prism in itself.
Preferably, the spectroscope another side is provided with the film that is all-trans.
Preferably, the light of the optical transmitting set transmitting is infrared light, visible ray or ultraviolet light.
Preferably, the photoelectric detector is spectrometer, the luminous intensity of different wave length is detected.
Preferably, it is provided with plus lens at the photoelectric detector.
Compared with prior art, it is the advantages of the utility model with good effect：
1st, the device of detection gas concentration described in the utility model sends out detection gas concentration compared to existing absorbance
Method, the energy accounting of gas concentration information in the optical signal that photoelectric detector receives is substantially increased, using identical
In the case of photoelectric sensor, it can increase substantially more than 1 order of magnitude of resolution ratio and detection limit performance of detection gas, from
And obtain lower detection limit and Geng Gao resolution ratio.
2nd, compared to existing low concentration detection method fluorescence method or the chromatography of ions, the utility model real-time is good,
Can quick detection specific gas concentration, and structure is relatively simple, can realize portable type measuring.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
In upper each figure：1st, optical transmitting set；2nd, spectroscope；3rd, part reflective semitransparent film；4th, be all-trans film；5th, high-reflectivity metal reflects
Layer；6th, reference air chamber；9th, sample gas air chamber；12nd, photoelectric detector；14th, right-angle prism.
Embodiment
In order to be better understood from the utility model, illustrate with reference to the accompanying drawings and examples.
Embodiment 1：A kind of method based on optical absorption and interferometry gas concentration, comprises the following steps：
1st, it is in 45 ° of light splitting for being radiated at the plane of incidence and being provided with part reflective semitransparent film by the incident light a that continuous spectrum light source is launched
On mirror；
2nd, incident light a is divided into the equal reflected light r and transmitted light t of energy through part reflective semitransparent film.From wave theory, enter
Penetrate light in optically thinner medium to advance, when running into optically denser medium interface, half-wave loss is produced in reflection process.Due to half-reflection and half-transmission
The refractive index of film is more than air refraction, and incident light a reflects through air into part reflective semitransparent film in incidence point, therefore reflects
Light r produces half-wave loss.
3rd, reflected light r and transmitted light t irradiates the reference gas being contained in identical air chamber and sample gas gas respectively, after air chamber
Total reflective mirror is provided with, reference gas are used to gas of the light source without absorption, such as high pure nitrogen.
4th, reflected light r and transmitted light t again passes by air chamber after total reflective mirror reflects respectively, is radiated on spectroscope, and r is through dividing
Transmitted light r ' after light microscopic, same light beam is combined into reflected light ts ' of the t after spectroscope.Because the refractive index of part reflective semitransparent film is small
In the refractive index of spectroscope body, therefore reflected light ts ' of the t after spectroscope does not have half-wave loss, and reflected light path and transmission
Path optics condition is identical, therefore r ' is mutually opposite with t ' position.
5th, absorbed because the gas in sample gas air chamber 9 has to the light of certain wavelength, therefore t ' beam intensity ratio r ' weakens, r '
With remainder light intensity after t ' interference cancellations, the remaining light intensity at zero order fringe is detected using spectrometer or photoelectric sensor, i.e.,
The part luminous energy that corresponding gas absorbs, the absorbance change of specific wavelength can be calculated so as to calculate corresponding under test gas
Concentration.
The method of detection gas concentration described in the present embodiment using spectroscope will be divided into light beam of light source two beam position phases and
Half-wave loss be present so as to which position is mutually opposite in light intensity identical coherent light, wherein light beam.Two-beam passes through optical condition identical
Reflect back into spectroscope through speculum after 2 air chambers, the two beams coherent light mutually opposite with the position in path is obtained after being divided again.If
It is absorbance same gas that 2 air chambers are interior, then two beam coherent light cancellations, and light energy is 0 at spectrometer.If an air chamber built with
Extinction gas, based on optical absorption principle, specific wavelength part light energy is absorbed by the specific components in sample gas.Then in this light beam
The energy dropoff of specific wavelength, then after two-beam interference cancellation, there will be part light remaining, remaining light intensity is detected through spectrometer,
And gas concentration can be calculated according to Lambert-Beer's law.With the existing gas concentration detection apparatus based on optical absorption
Compare, the detection limit is low, high resolution, can effective detection low content gas concentration value.
Embodiment 2：As shown in figure 1, a kind of device of detection gas concentration, including optical transmitting set 1, spectroscope 2, air chamber,
Right-angle prism 14 and photoelectric detector 12.The spectroscope 2 is set horizontal by 45 ° of angles, and the transmitting of optical transmitting set 1 connects
The incident light a horizontal irradiations of continuous spectrum are on spectroscope 2.Spectroscope 2 is arranged at intervals with two pieces of part reflective semitransparent films at the plane of incidence
3, the another side of spectroscope 2 is provided with the film 4 that is all-trans.The air chamber is divided into two Hes of reference air chamber 6 of both sides through two pieces of dividing plates
Middle sample gas air chamber 9, air chamber one end is connected with right-angle prism 14.Incident light a by part reflective semitransparent film be divided into reflected light r and thoroughly
Penetrate light t.Reflected light r is radiated at the right-angle side the latter half of right-angle prism 14 after reference air chamber 6, is provided with the film 4 that is all-trans at this,
The reflectance coating refractive index is less than the refractive index of right-angle prism 14, therefore does not have half-wave loss.Reflected after reflection through another right-angle side
To another reference air chamber 6, the light beam is referred to as r1, and through being radiated on spectroscope 2 after this, wherein transmitted light is after the film 4 that is all-trans reflects
It is aimed downwardly on spectroscope 2, light generation transmission in part is downwards out, and the light beam is referred to as r2.Transmitted light t is after sample gas air chamber 9
The top half of the right-angle side of right-angle prism 14 is radiated at, the part is provided with the high reflection that refractive index is more than the matrix of right-angle prism 14
Rate metallic reflector or high index of refraction total reflection film 5, transmitted light t are reflected to and half-wave loss occur.Through another after this
Right-angle side reflection is radiated on spectroscopical part reflective semitransparent film after sample gas air chamber 9, and wherein reflected light is downwards out, and the light beam claims
For t2.R2 and t2 be with light source coherent light, because two parts light path light path is identical, and half-wave loss wherein occurs all the way so
Therefore position is mutually on the contrary, produce interference cancellation.The light energy after cancellation is detected by spectrometer, by can be calculated sample gas air chamber
Specific gas concentration in 9.
The device of detection gas concentration described in the present embodiment, the unique design through spectroscope 2 and air chamber, the light of two light paths
Line is parallel, and apparatus structure is compact.And air chamber integration, it is ensured that two optical path lengths are consistent, without adjusting reference air chamber 6 and sample gas
The optical path length of air chamber 9, it is easier to process.
Also there is the gas concentration detection apparatus using interferometric method observation moving interference fringes in the prior art, it depends on and treated
It is different from the refractive index of sample gas gas to survey gas, but when under test gas concentration is relatively low, variations in refractive index is very small, interference
Move of stripe is difficult to monitor.When monitoring light concentration gas, the making required precision to optics is very high, and little deviation is
Striped is caused to be difficult to be formed or shift.And when under test gas is not one-component, gas with various influences refractive index,
So as to use.If in sample gas containing more than one absorb gas, absorb gas absworption peak do not have it is overlapping in the case of, adopt
Absorption caused by which kind of gas can be received so as to analyze by the light intensity of spectrometer analysis different wave length with the present apparatus, can be same
When detect multiple gases concentration.
It is described above, only it is preferred embodiment of the present utility model, is not that other forms are made to the utility model
Limitation, any person skilled in the art is changed or is modified as possibly also with the technology contents of the disclosure above equivalent
The equivalent embodiment of change is applied to other fields, but every without departing from the content of the technical scheme of the utility model, according to this reality
Any simple modification, equivalent variations and the remodeling made with new technical spirit to above example, it is new to still fall within this practicality
The protection domain of type technical scheme.
Claims (5)
- A kind of 1. device of detection gas concentration, it is characterised in that：Including optical transmitting set, spectroscope, air chamber, right-angle prism and light Photodetector, the optical transmitting set transmitting incident light is in 45 ° of irradiation spectroscopes, and the spectroscope light entrance face is arranged at intervals with half Anti- pellicle, another side are provided with the film that is all-trans, and the air chamber is divided into two reference air chambers and the centre of both sides through two pieces of dividing plates Sample gas air chamber；The top half of one right-angle side of the right-angle prism or the latter half are provided with refractive index and are more than it The dielectric reflection film or metallic reflective coating of body, the remainder of right-angle side are provided with refractive index and are less than the reflection of right-angle prism in itself Film.
- 2. the device of detection gas concentration according to claim 1, it is characterised in that：The spectroscope another side is provided with Be all-trans film.
- 3. the device of detection gas concentration according to claim 2, it is characterised in that：The light of optical transmitting set transmitting is Infrared light, visible ray or ultraviolet light.
- 4. the device of detection gas concentration according to claim 3, it is characterised in that：The photoelectric detector is spectrum Instrument, detect the luminous intensity of different wave length.
- 5. the device of detection gas concentration according to claim 4, it is characterised in that：It is provided with the photoelectric detector Plus lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721070505.0U CN207147963U (en) | 2017-08-25 | 2017-08-25 | A kind of device of detection gas concentration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721070505.0U CN207147963U (en) | 2017-08-25 | 2017-08-25 | A kind of device of detection gas concentration |
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| CN207147963U true CN207147963U (en) | 2018-03-27 |
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| CN201721070505.0U Expired - Fee Related CN207147963U (en) | 2017-08-25 | 2017-08-25 | A kind of device of detection gas concentration |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107345904A (en) * | 2017-08-25 | 2017-11-14 | 青岛众瑞智能仪器有限公司 | Method and device based on optical absorption and interferometry gas concentration |
| CN111751312A (en) * | 2020-08-18 | 2020-10-09 | 杭州谱析光晶半导体科技有限公司 | Indoor air quality monitoring system and method based on light field reconstruction device |
-
2017
- 2017-08-25 CN CN201721070505.0U patent/CN207147963U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107345904A (en) * | 2017-08-25 | 2017-11-14 | 青岛众瑞智能仪器有限公司 | Method and device based on optical absorption and interferometry gas concentration |
| CN107345904B (en) * | 2017-08-25 | 2023-10-03 | 青岛众瑞智能仪器股份有限公司 | Method and device for detecting gas concentration based on optical absorption and interferometry |
| CN111751312A (en) * | 2020-08-18 | 2020-10-09 | 杭州谱析光晶半导体科技有限公司 | Indoor air quality monitoring system and method based on light field reconstruction device |
| CN111751312B (en) * | 2020-08-18 | 2023-08-08 | 杭州谱析光晶半导体科技有限公司 | Indoor air quality monitoring system and method based on light field reconstruction device |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
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| CP03 | Change of name, title or address |
Address after: 266000 No. 1 Xueyue Road, Chengyang District, Qingdao City, Shandong Province Patentee after: Qingdao Zhongrui Intelligent Instrument Co.,Ltd. Address before: No.3, Xiandong Road, Xiazhuang street, Chengyang District, Qingdao City, Shandong Province 266109 Patentee before: QINGDAO ZHONGRUI INTELLIGENT INSTRUMENT Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180327 |