CN205786277U - The laser gas detection platform of multiple reflections long light path high temp samples room - Google Patents
The laser gas detection platform of multiple reflections long light path high temp samples room Download PDFInfo
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- CN205786277U CN205786277U CN201620369365.6U CN201620369365U CN205786277U CN 205786277 U CN205786277 U CN 205786277U CN 201620369365 U CN201620369365 U CN 201620369365U CN 205786277 U CN205786277 U CN 205786277U
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Abstract
This utility model relates to the laser gas detection platform of a kind of multiple reflections long light path high temp samples room.Including: platform base 22, sample room housing 11, optical path adjustment device 1, laser beam emitting device 2, reception device mounting seat 21, laser receiver 20, conjugation laser-bounce device；Have gas access 9 above the side of sample room housing 11, above the opposite side of sample room housing 11, have gas outlet 13, sample room housing 11 be respectively arranged at two ends with incidence window 7 and exit window 15；Laser beam emitting device 2 is arranged on optical path adjustment device 1, and laser receiver 20 is arranged in reception device mounting seat 21；Conjugation laser-bounce device includes the first concave mirror 3 and the second concave mirror 19.This gas detection platform, certainty of measurement is high, owing to the hot spot of laser is less, uses multiple reflections that the sample gas light path that detection light passes through is increased to 10 30 times；Volume is little, and multiple reflections formula structure makes long light path sample air chamber contraction in length；Low cost, simplifies the mechanical-optical setup of complexity, reduces the structural member cost of measurement system.
Description
Technical field
This utility model relates to a kind of laser gas detection platform, particularly to a kind of thermal zone multiple reflections sample room
Laser gas detection platform.
Background technology
Along with society and expanding economy, Air resource is more and more closer with the relation of people.On the one hand, atmospheric pollution is
One of interesting issue, in the urgent need to various harmful poisonous, the inflammable and explosive gas produced in industry, transportation
It is monitored；On the other hand, utilizing various gas when, such as exploitation and the use of natural gas, coal gas, liquefied gas etc.,
Or the gas system used in aerospace industry, the detection to various gas concentrations is indispensable.
In the case of unsaturated weak absorbing, semiconductor laser can use Beer-through the light intensity attenuation of tested gas
Lambert relation is stated:
lv= I0T(v)= I0exp[-S(T)g(v-v0) PXL] (1).
In formula: I0And IνRepresent respectively when frequency is the one-wavelength laser incidence of ν and through light path L, gas pressure P and volume
Concentration is the light intensity after the gas of X.Line shape function g (ν-ν 0) characterizes the shape of this absorption line, it and gas temperature, pressure
Relevant.S (T) represents the intensity of gas absorption spectrum line, is the function of gas temperature.S (T) parameter of conventional gas can be at molecule light
Modal data storehouse HITRAN inquires about.
From Beer-Lambert relation, when other parameters are constant, gas concentration is inversely proportional to light path.Therefore when tested
When gas content is the lowest, detection can be realized by longer optical path.By measuring the gas decay to laser intensity, according to formula
(1) and S (T) and g (ν-ν 0) and temperature, the quantitative relationship of pressure and other parameters, it is possible to obtain the concentration information of tested gas.
In the detection of air trace gas, it is generally required to combine with long light path repeatedly absorption techniques, it is used for improving under instrument detection
Restrict water supply flat.
Longer optical path typically uses reflecting mirror that light is carried out multiple reflections and realizes, and reflecting mirror is once arranged on gas
Behind indoor, its position and angle are difficult to regulation, thus are relatively inaccessible to preferable light path.And traditional return gas compartment exists into
This height, the not shortcoming such as easy cleaning after reflecting mirror is contaminated.
Summary of the invention
The problem that this utility model exists for prior art, it is provided that a kind of employing Herriott multiple reflections formula air chamber
To ensure long light path, certainty of measurement is high, and volume is little, the laser gas inspection of the miniaturization band multiple reflections high temp samples room of low cost
Survey platform.
The purpose of this utility model is achieved through the following technical solutions.
The gas detection platform of multiple reflections long light path high temp samples room, including
Platform base；
Sample room housing, described sample room housing is arranged on described platform base, the sidewall of the side of sample room housing
Being provided above gas access, the sidewall of the opposite side of sample room housing is provided above gas outlet, the two of sample room housing
End is respectively equipped with incidence window and exit window；The left upper part of described sample room housing is provided with the first light hole；Described sample
The right-hand member bottom of room housing is provided with the second light hole；
Optical path adjustment device, described optical path adjustment device is arranged on described platform base, a left side for described sample room housing
Outside end；
Receiving device mounting seat, described reception device mounting seat is arranged on described platform base, described sample room housing
Right-hand member outside；
Laser beam emitting device, described laser beam emitting device is arranged on the optical path adjustment device outside the first light hole, swashs
Light emitting devices is the initiating terminal launching light；
Laser receiver, described laser receiver is arranged in the reception device mounting seat outside the second light hole,
Laser receiver is the end launching light；
Conjugation laser-bounce device, described conjugation laser-bounce device is used being total to of Herriott Cell principle by two panels
Yoke concave mirror is constituted, including the first concave mirror and the second concave mirror, described first concave mirror, second recessed
Face reflecting mirror is separately fixed at the two ends of sample room housing；Described first concave mirror is arranged on the second concave mirror and installs
On seat, described second concave mirror is arranged in the second concave mirror mounting seat；
Described first concave mirror is arranged on before incidence window, and described second concave mirror is arranged on exit window
After Kou；
The transmitting light of laser beam emitting device is after the inner chamber that incidence window is injected into sample room housing, through exit window
Mouthful, it being mapped to the second concave mirror, be reflected, light is conjugated the first concave mirror, the second concave mirror in two panels and enters
Penetrate between window, exit window through multiple reflections, be finally mapped on laser receiver by the outlet of the second concave mirror.
Further, described sample room housing is additionally provided with heating apparatus, attemperating unit, pressure sensor device.
Further, described incidence window and exit window be the deviation angle be the wedge-shaped mirrors of the coating anti-reflection film of 2 ° ~ 10 °
Sheet, wedge-shaped lens is used for sealing tested gas, it also avoid plane window simultaneously and produces bigger light path noise.
Further, described laser beam emitting device is made up of semiconductor laser and laser alignment mirror.
Further, described laser receiver is made up of photodetector.
Further, between described first concave mirror and incidence window, be provided with heat insulation A, the second concave mirror and
Heat insulation B it is provided with between exit window；The mounting means of heat insulation is that plug-in type is installed, and the effect of heat insulation: the most heat insulation is 2. anti-
Only ambient atmos flowing produces impact to light path；Heat insulation uses plug-type mounting means to avoid heat distortion and produces light path
Raw impact.
Further, the both sides of described sample room housing are respectively equipped with window, it is simple to observe and adjust light path and cleaning window,
Opening window when adjusting light path or cleaning window, light path has adjusted or has cleaned after window completes, sealed window.
Further, described optical path adjustment device includes translating mounting seat, adjustable adaptor, and translation mounting seat provides XY to adjust
Joint, adjustable adaptor provides pitching and yaw adjustment.
Further, described heating apparatus is heating rod, and described heating rod is fixed on described sample by heating rod pressing plate
On the housing of room, described attemperating unit heat conductive silica gel is fixed on the housing of described sample room.
Further, described incidence window is arranged in the first wedge mirror mounting seat；Described exit window is arranged on the second wedge
In mirror mounting seat.
The gas detection platform of multiple reflections long light path high temp samples room by adjusting sample room shell length and can lead to
Cross adjustment optical path adjustment device to adjust order of reflection, it is thus achieved that different actual light paths.
A kind of gas detecting using Herriott multiple reflections long light path high temp samples room described in the utility model is put down
Platform operation principle is: laser beam emitting device is adjusted to the wavelength corresponding with tested gas optical maser wavelength, is entered by collimating lens
Enter multiple reflections sample room, after the multiple reflections of conjugation reflective concave surface mirror, after collimating lens, enter photodetector；
Photodetector and pressure sensor device send signal collection and analysis circuit analysis and process to receiving signal, finally calculate
Go out the concentration of tested gas.
The beneficial effects of the utility model are: provide a kind of employing Herriott multiple reflections long light path high temp samples
The gas detection platform of room, certainty of measurement is high, owing to the hot spot of laser is less, have employed multiple reflections formula sample room, can be by
The light path of the sample gas that detection light passes through increases 10-30 times, thus accomplishes the measurement of higher precision；Volume is little, have employed repeatedly
Reflective structure, original long light path sample air chamber needed was greatly shortened, simultaneously because the hot spot of laser less thereby ensure that
The volume of multiple reflections formula sample room, ensures that response speed；Low cost, after the mechanical-optical setup simplifying complexity significantly
The structural member cost of the measurement system that reduces of degree.
Accompanying drawing explanation
Fig. 1 is the structural representation sectional view of the gas detection platform of multiple reflections long light path high temp samples room.
Fig. 2 is the light path schematic diagram of the gas detection platform of multiple reflections long light path high temp samples room.
Fig. 3 is the structural representation top view of the gas detection platform of multiple reflections long light path high temp samples room.
Fig. 4 is the structural representation axonometric chart of the gas detection platform of multiple reflections long light path high temp samples room.
Fig. 5 (a) is that incidence end simulates hot spot design sketch, and (b) is that reflection end simulates hot spot design sketch.
In figure: 1-optical path adjustment device；2-laser beam emitting device；3-the first concave mirror；4-the first concave mirror
Mounting seat；5-heat insulation A；6-the first wedge mirror mounting seat；7-incidence window；8-first seals O；9-gas access；10-
Heating rod pressing plate；11-sample room housing；12-pressure transducer；13-gas outlet；14-second seals O；15-exit window
Mouthful；16-the second wedge mirror mounting seat；17-heat insulation B；18-the second concave mirror mounting seat；19-the second concave mirror；20-
Laser receiver；21-receives device mounting seat；22-platform base；23-the first light hole；24-the second light hole；25-adds
Hot pin；26-attemperating unit；27-window.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, the most ad initio
Represent same or similar element to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment examining accompanying drawing description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In description of the present utility model, it is to be understood that term " " center ", " on ", D score, "front", "rear",
The orientation of the instruction such as "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " or position relationship are for based on accompanying drawing institute
The orientation shown or position relationship, be for only for ease of and describe the present invention and simplify description rather than instruction or the dress of hint indication
Put or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this utility model
Restriction.
In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", should be interpreted broadly " being connected ", " connection ", for example, it may be fix connection, it is also possible to be to removably connect, or integratedly
Connect；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be the connection of two element internals.For
For those of ordinary skill in the art, above-mentioned term concrete meaning in this utility model can be understood with concrete condition.
As Figure 1-4, the gas detection platform of multiple reflections long light path high temp samples room, including:
Platform base 22；
Sample room housing 11, described sample room housing 11 is arranged on described platform base 22, the one of sample room housing 11
The sidewall of side is provided above gas access 9, and the sidewall of the opposite side of sample room housing 11 is provided above gas outlet 13, sample
Product room housing 11 be respectively arranged at two ends with incidence window 7 and exit window 15；The left upper part of described sample room housing 11 is provided with
First light hole 23；The right-hand member bottom of described sample room housing 11 is provided with the second light hole 24；
Optical path adjustment device 1, described optical path adjustment device 1 is arranged on described platform base 22, described sample room housing
Outside the left end of 11；
Receiving device mounting seat 21, described reception device mounting seat 21 is arranged on described platform base 22, described sample
Outside the right-hand member of room housing 11；
Laser beam emitting device 2, described laser beam emitting device 2 is arranged on the optical path adjustment device 1 outside the first light hole 23
On, laser beam emitting device 2 is the initiating terminal launching light；
Laser receiver 20, described laser receiver 20 is arranged on the reception device outside the second light hole 24 and installs
On seat 21, swash
Optical pickup apparatus 20 is the end launching light；
Conjugation laser-bounce device, described conjugation laser-bounce device is used being total to of Herriott Cell principle by two panels
Yoke concave mirror is constituted, including the first concave mirror 3 and the second concave mirror 19, and described first concave mirror 3, the
Two concave mirrors 19 are separately fixed at the two ends of sample room housing 11；Described first concave mirror 3 is arranged on the first concave surface
In reflecting mirror mounting seat 4, described second concave mirror 19 is arranged in the second concave mirror mounting seat 18；
Described first concave mirror 3 is arranged on before incidence window 7, and described second concave mirror 19 is arranged on out
Penetrate after window 15.
The transmitting light of laser beam emitting device 2 is after the inner chamber that incidence window 7 is injected into sample room housing 11, through going out
Penetrating window 15, be mapped to the second concave mirror 19, be reflected, it is anti-that light is conjugated first concave mirror the 3, second concave surface in two panels
Penetrate between mirror 19 and incidence window 7, exit window 15 through multiple reflections, finally be mapped to swash by the outlet of the second concave mirror 19
On optical pickup apparatus 20.
Heating apparatus, attemperating unit 26, pressure sensor device 12 it is additionally provided with on described sample room housing 11；Described dress of heating
Putting is heating rod 25, and described heating rod 25 is fixed on described sample room housing 11 by heating rod pressing plate 10.
The wedge-shaped lens that described incidence window 7 and exit window 15 are coating anti-reflection film that the deviation angle is 2 ° ~ 10 °.
Described laser beam emitting device 2 is made up of semiconductor laser and laser alignment mirror；Laser receiver 20 is by photoelectricity
Detector is constituted.
Heat insulation A5, the second concave mirror 19 and outgoing it is provided with between described first concave mirror 3 and incidence window 7
Heat insulation B17 it is provided with between window 15；Heat insulation A5, the mounting means of heat insulation B17 are that plug-in type is installed.
The both sides of described sample room housing 11 are respectively equipped with window 27.
Described optical path adjustment device 1 includes translating mounting seat, adjustable adaptor.
Described incidence window 7 is arranged in the first wedge mirror mounting seat 6, the quilt in extruding the first sealing O 8 annular seal space body
Detected gas；Described exit window 15 is arranged in the second wedge mirror mounting seat 16, in extruding the second sealing O 14 annular seal space body
Detected gas.
Embodiment 1: we are injected by laser beam emitting device 2 and survey NH3Corresponding wavelength is the laser instrument of 1512nm, and unlatching adds
Temperature unit simulation site environment, uses optical path adjustment device 1 to adjust light path, and the transmitting light of laser beam emitting device 2 is through incidence
After window 7 is injected into the inner chamber of sample room housing 11, through exit window 15, it is mapped to the second concave mirror 19, is reflected, light
Line is conjugated between first concave mirror the 3, second concave mirror 19 and incidence window 7, exit window 15 through repeatedly in two panels
Reflection, is finally mapped on laser receiver 20 by the outlet of the second concave mirror 19.
Be illustrated in figure 5 simulation hot spot design sketch, detected gas be passed through from gas access 9 sample room housing 11 again from
Gas outlet 13 discharges.
Certainly, we can use the laser instrument of different wave length to detect corresponding different types of gas, laser wavelength
Corresponding tested gas is recommended to see table 1.
Table 1:
Embodiment 2: unlike embodiment 1, owing to the absorption signal intensity of tested gas is bigger or required
Accuracy of detection is relatively low, it is not necessary to longer light path, thus directly uses one section of sample room housing 11 meeting application Len req
As detection sample room, now, need not in sample room housing 11 arrange conjugation laser-bounce device；And laser beam emitting device 2
The laser straight launched accesses and injects sample room housing 11, then by after sample room housing 11 other end outgoing through collimation post-concentration extremely
On laser receiver 20.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment of the present utility model or example.In this manual, the schematic table to above-mentioned term
State and be not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or feature can be
Any one or more embodiments or example combine in an appropriate manner.
Embodiment the most of the present utility model, it will be understood by those skilled in the art that:
In the case of without departing from principle of the present utility model and objective, these embodiments can be carried out multiple change, revise, replace
And modification, scope of the present utility model is limited by claim and equivalent thereof.
Claims (10)
1. the laser gas detection platform of multiple reflections long light path high temp samples room, it is characterised in that: include
Platform base (22)；
Sample room housing (11), described sample room housing (11) is arranged on described platform base (22), sample room housing (11)
The sidewall of side be provided above gas access (9), the sidewall of the opposite side of sample room housing (11) is provided above gas
Outlet (13), sample room housing (11) be respectively arranged at two ends with incidence window (7) and exit window (15)；Described sample room housing
(11) left upper part is provided with the first light hole (23)；The right-hand member bottom of described sample room housing (11) is provided with the second light hole
(24)；
Optical path adjustment device (1), described optical path adjustment device (1) is arranged on described platform base (22), described sample room shell
Outside the left end of body (11)；
Receiving device mounting seat (21), described reception device mounting seat (21) is arranged on described platform base (22), described sample
Outside the right-hand member of product room housing (11)；
Laser beam emitting device (2), described laser beam emitting device (2) is arranged on the optical path adjustment device in the first light hole (23) outside
(1), on, laser beam emitting device (2) is the initiating terminal launching light；
Laser receiver (20), described laser receiver (20) is arranged on the reception device peace in the second light hole (24) outside
On dress seat (21), laser receiver (20) is the end launching light；
Conjugation laser-bounce device, described conjugation laser-bounce device is recessed by the conjugation of two panels employing Herriott Cell principle
Face reflecting mirror is constituted, including the first concave mirror (3) and the second concave mirror (19), described first concave mirror (3),
Second concave mirror (19) is separately fixed at the two ends of sample room housing (11)；Described first concave mirror (3) is arranged on
In first concave mirror mounting seat (4), described second concave mirror (19) installs the second concave mirror mounting seat (18)
On；
Described first concave mirror (3) is arranged on before incidence window (7), and described second concave mirror (19) is arranged on
After exit window (15)；
The transmitting light of laser beam emitting device (2), after the inner chamber that incidence window (7) is injected into sample room housing (11), passes through
Exit window (15), is mapped to the second concave mirror (19), is reflected, light two panels be conjugated the first concave mirror (3),
Through multiple reflections between two concave mirrors (19) and incidence window (7), exit window (15), finally by the second concave mirror
(19) outlet is mapped on laser receiver (20).
The laser gas detection platform of multiple reflections long light path high temp samples room the most according to claim 1, its feature exists
In: it is additionally provided with heating apparatus, attemperating unit (26), pressure sensor device (12) on described sample room housing (11).
The laser gas detection platform of multiple reflections long light path high temp samples room the most according to claim 1, its feature exists
In: incidence window (7) and exit window (15) be the deviation angle be the wedge-shaped lens of the coating anti-reflection film of 2 ° ~ 10 °.
The laser gas detection platform of multiple reflections long light path high temp samples room the most according to claim 1, its feature exists
In: laser beam emitting device (2) is made up of semiconductor laser and laser collimator lens.
The laser gas detection platform of multiple reflections long light path high temp samples room the most according to claim 1, its feature exists
In: laser receiver (20) is made up of photodetector.
The laser gas detection platform of multiple reflections long light path high temp samples room the most according to claim 1, its feature exists
In: be provided with heat insulation A(5 between the first concave mirror (3) and incidence window (7)), the second concave mirror (19) and outgoing
Window is provided with heat insulation B(17 between (15))；Heat insulation A(5), heat insulation B(17) mounting means be plug-in type install.
The laser gas detection platform of multiple reflections long light path high temp samples room the most according to claim 1, its feature exists
In: the both sides of described sample room housing (11) are respectively equipped with window (27).
The laser gas detection platform of multiple reflections long light path high temp samples room the most according to claim 1, its feature exists
In: described optical path adjustment device (1) includes translating mounting seat, adjustable adaptor.
The laser gas detection platform of multiple reflections long light path high temp samples room the most according to claim 2, its feature exists
In: described heating apparatus is heating rod (25), and described heating rod (25) is fixed on described sample room by heating rod pressing plate (10)
On housing (11), described attemperating unit (26) heat conductive silica gel is fixed on described sample room housing (11).
The laser gas detection platform of multiple reflections long light path high temp samples room the most according to claim 3, its feature exists
In: described incidence window (7) is arranged on the first wedge mirror mounting seat (6)；Described exit window (15) is arranged on the second wedge mirror and installs
On seat (16).
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758803A (en) * | 2016-04-28 | 2016-07-13 | 中钢集团武汉安全环保研究院有限公司 | Laser gas detection platform with multiple-reflection long-optical-path high-temperature sample chamber |
| CN111537454A (en) * | 2020-04-27 | 2020-08-14 | 深圳网联光仪科技有限公司 | Comprehensive detection method based on multiple reflection and attenuated total reflection |
| CN111896475A (en) * | 2020-07-29 | 2020-11-06 | 东北大学秦皇岛分校 | Light path range-extending type photoacoustic cell for photoacoustic spectrum trace gas detection |
| CN112362235A (en) * | 2020-12-04 | 2021-02-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Light path adjustable components of a whole that can function independently adds hot type gas pressure calibrating device |
| CN115508308A (en) * | 2022-10-10 | 2022-12-23 | 黄海造船有限公司 | Anti-interference high-precision ammonia gas leakage detection device |
-
2016
- 2016-04-28 CN CN201620369365.6U patent/CN205786277U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758803A (en) * | 2016-04-28 | 2016-07-13 | 中钢集团武汉安全环保研究院有限公司 | Laser gas detection platform with multiple-reflection long-optical-path high-temperature sample chamber |
| CN111537454A (en) * | 2020-04-27 | 2020-08-14 | 深圳网联光仪科技有限公司 | Comprehensive detection method based on multiple reflection and attenuated total reflection |
| CN111537454B (en) * | 2020-04-27 | 2023-08-04 | 深圳网联光仪科技有限公司 | Comprehensive detection method based on multiple reflection and attenuated total reflection |
| CN111896475A (en) * | 2020-07-29 | 2020-11-06 | 东北大学秦皇岛分校 | Light path range-extending type photoacoustic cell for photoacoustic spectrum trace gas detection |
| CN112362235A (en) * | 2020-12-04 | 2021-02-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Light path adjustable components of a whole that can function independently adds hot type gas pressure calibrating device |
| CN112362235B (en) * | 2020-12-04 | 2022-03-25 | 中国航空工业集团公司北京长城计量测试技术研究所 | Light path adjustable components of a whole that can function independently adds hot type gas pressure calibrating device |
| CN115508308A (en) * | 2022-10-10 | 2022-12-23 | 黄海造船有限公司 | Anti-interference high-precision ammonia gas leakage detection device |
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