CN206479449U - Optical gas absorbance pond and optical gas sensor - Google Patents
Optical gas absorbance pond and optical gas sensor Download PDFInfo
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- CN206479449U CN206479449U CN201720103106.3U CN201720103106U CN206479449U CN 206479449 U CN206479449 U CN 206479449U CN 201720103106 U CN201720103106 U CN 201720103106U CN 206479449 U CN206479449 U CN 206479449U
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Abstract
The utility model provides a kind of optical gas absorbance pond and optical gas sensor, is related to gas detection and analytical equipment technical field.The optical gas absorbance pond includes being supported housing, and for the inner chamber for connecting housing and extraneous support stick；The optical gas sensor includes laser beam emitting device, above-mentioned optical gas absorbance pond and the signal processing apparatus for data processing.Gas to be detected is from the air inlet passage of support stick one end along it circumferentially around air inlet, so as to improve the gas displacement speed in air absorbing cavity and gas displacement fully without dead angle, the technical problem that optical sensor responses speed is slow, detection efficiency is low is solved present in prior art.
Description
Technical field
The utility model be related to gas detection with analytical equipment technical field, more particularly to a kind of optical gas absorbance pond and
Optical gas sensor.
Background technology
In recent years, continue haze event occurred frequently and promote great attention of the country to environmental protection, accordingly, country enhances
To the multiple industry production processes in automobile, electric power, chemical industry, metallurgy, weaving, pharmacy, especially colliery and oil etc. in industrial production
The monitoring of middle discharge gas, wherein, the detection and analysis to discharge gas is most important.
At present, to the detection and analysis of gas mainly using t unable filter (TDLAS or
TDLS), the electric current different to laser input and temperature obtain the laser of different wave length, to after gas to be detected absorption
Laser carries out spectrum analysis, and obtaining every physical parameter of gas to be detected, (gaseous species, gas concentration, gas temperature are gentle
Body pressure etc.).It is mainly used in environmental monitoring, industrial stokehold, biology and medical research, combustion process diagnostic analysis, hair
The spectral detection in the fields such as motivation conversion efficiency, motor-vehicle tail-gas and Atmospheric Trace dusty gas.
The structure of gas absorption cell is directly connected in effective light path of the light in gas to be detected, gas absorption cell
Gas displacement speed determines the detection efficiency of gas sensor.The gas absorption cell air inlet side of existing optical gas sensor
To single, the gas displacement speed of gas to be detected is smaller in gas absorption cell, causes that the response speed of gas sensor is slow, inspection
Survey efficiency low.
Utility model content
The purpose of this utility model is to provide a kind of optical gas absorbance pond and optical gas sensor, existing to solve
The gas absorption cell airintake direction of optical gas sensor present in technology is single, gas to be detected in optical gas absorbance pond
Gas displacement speed it is smaller, cause the technical problem that the response speed of optical gas sensor is slow, detection efficiency is low.
The optical gas absorbance pond that the utility model is provided, including housing and support stick, the housing provided with intake section and
Offered on outlet portion, the intake section and offer venthole in air admission hole, the outlet portion；The support stick is plugged in described
The inner chamber of housing, described support stick one end is air inlet inserted terminal, and the other end is outlet inserted terminal；The air inlet inserted terminal is along its axle
To inlet channel is offered, the inlet channel is connected with the air admission hole, and the outlet inserted terminal is offered out along its axial direction
Gas passage, the outlet passageway is connected with the venthole；The support stick close to the position of its air inlet inserted terminal offer into
Gas passage, outlet passage, air inlet passage and the outlet ventilation are offered close to the position of its outlet inserted terminal
Hole is multiple, and respectively along the circumferentially distributed of the support stick, the air inlet passage connect the inlet channel with it is described
The inner chamber of housing, the outlet passage connects the inner chamber of the outlet passageway and the housing.
Further, circumference of multiple air inlet passages along the support stick is uniformly distributed；Multiple outlets lead to
Circumference of the stomata along the support stick is uniformly distributed.
Further, the air inlet inserted terminal of the support stick is equipped with incidence reflection mirror, and the incidence reflection mirror is provided with
Incidence window piece；The outlet inserted terminal is equipped with outgoing speculum, and the outgoing speculum is provided with exit window piece, described
The minute surface of incidence reflection mirror and the outgoing speculum is oppositely arranged；It is close between the incidence reflection mirror and the outgoing speculum
Envelope is connected with sleeve, and three is collectively forming air absorbing cavity.
Further, the inner surface of the intake section of the housing along its it is axially extending have an air inlet locating piece, the air inlet is determined
Position block offers air inlet inserting groove along its axial direction, and the air inlet inserting groove is connected with the air admission hole；The outlet portion of the housing
Inner surface along its it is axially extending have outlet locating piece, the outlet locating piece offers outlet inserting groove along its axial direction, described
Outlet inserting groove is connected with the venthole；The air inlet inserted terminal of the support stick is plugged in the air inlet inserting groove, described
The outlet inserted terminal of support stick is plugged in the outlet inserting groove；The incidence reflection mirror sealing shroud is positioned located at the air inlet
In the outer peripheral sidewall of block, the outgoing speculum sealing shroud is in the outer peripheral sidewall of the outlet locating piece.
Further, sealing ring is provided between the incidence reflection mirror and the sleeve；The outgoing speculum with it is described
Sealing ring is provided between sleeve.
Further, from up to down vertically outward-dipping 8 ° of the incidence window piece and the exit window piece
Inclination angle.
Further, the incidence window piece and the exit window piece select CaF2Structural member.
Further, sealing is provided with observation window on the sleeve, offers peep hole on the housing, the peep hole with
The observation window is corresponding.
Further, the TEMP for measuring gas temperature in the air absorbing cavity is installed with the housing
Device.
The utility model optical gas absorbance pond has the beneficial effect that：
The optical gas absorbance pond that the utility model is provided, including for being passed through the air admission hole of gas to be detected and for arranging
Except the venthole of gas or gas to be detected in housing；Wherein, support stick is used to support whole device, and for connecting to be detected
Gas and air absorbing cavity.Optical absorption pond mainly utilize Lambert-Beer's law, i.e., gas to be detected to pass through one
(i.e. laser exists the concentration and absorber thickness of the absorption of the directional light progress light intensity of standing wave length, its absorbance and gas to be detected
Effective light path in the gas to be detected) it is directly proportional.
In the optical gas absorbance pond, support stick is arranged on the inner chamber of housing, and gas to be detected enters from support stick one end
It was passed through, is discharged from the outlet passage of the other end, gas displacement speed circumferentially around one week along support stick in gas passage
Comparatively fast, and to the gas displacement in the inner chamber of housing fully without dead angle, so as to improve the detection efficiency of optical gas sensor.
Another purpose of the present utility model is to provide a kind of optical gas sensor, including laser beam emitting device and upper
State optical gas absorbance pond, the laser emitting mouthful and the incidence window piece in the optical gas absorbance pond of the laser beam emitting device
Connection；The exit window piece in the optical gas absorbance pond is connected with signal processing apparatus, and the optical gas sensor has upper
All technique effects in optical gas absorbance pond are stated, are repeated no more here.
The utility model optical gas sensor has the beneficial effect that：
The optical gas sensor that the utility model is provided, wherein, the operation principle in optical gas absorbance pond is above
It is described in detail, repeats no more here.Laser beam emitting device injects laser, warp to the incidence window piece in optical gas absorbance pond
The laser entering signal processing unit projected behind optical gas absorbance pond is crossed, the related concentrations for obtaining gas to be detected through processing are believed
Breath, so as to realize the Concentration Testing to gas to be detected.It is corresponding with optical gas absorbance pond, the sound of the optical gas sensor
Answer that speed is fast, detection efficiency is high.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that, describe below
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the main structure diagram in the optical gas absorbance pond that the utility model embodiment one is provided；
Fig. 2 is the B-B cross-sectional structure schematic diagrames in optical gas absorbance pond in Fig. 1；
Fig. 3 is the A-A cross-sectional structure schematic diagrames in optical gas absorbance pond in Fig. 1；
Fig. 4 is the dimensional structure diagram in the optical gas absorbance pond that the utility model embodiment one is provided.
Icon：1- housings；2- support sticks；3- incidence reflection mirrors；4- outgoing speculums；5- sleeves；6- gases are inhaled
Receive chamber；7- observation windows；11- intake sections；12- outlets portion；111- air admission holes；112- air inlet locating pieces；113- air inlets are inserted
Access slot；121- ventholes；122- outlet locating pieces；123- outlet inserting grooves；21- air inlet inserted terminals；22- outlet grafting
End；211- inlet channels；212- air inlet passages；221- outlet passageways；222- outlet passages.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is a part of embodiment of the utility model, rather than whole embodiments.Based on the embodiment in the utility model, sheet
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.
, it is necessary to explanation in description of the present utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular
Directly ", the orientation or position relationship of the instruction such as " level ", " interior ", " outer " are, based on orientation shown in the drawings or position relationship, to be only
Described for the ease of description the utility model and simplifying, rather than to indicate or imply that signified device or element must have specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.In addition, term " the
One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or implying relative importance.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
Embodiment one
The present embodiment provides a kind of optical gas absorbance pond, as Figure 1-Figure 4, including housing 1 and support stick 2, housing
1 is provided with intake section 11 and outlet portion 12, offers on intake section 11 and offers venthole 121 in air admission hole 111, outlet portion 12；
Support stick 2 is plugged in the inner chamber of housing 1, and the one end of support stick 2 is air inlet inserted terminal 21, and the other end is outlet inserted terminal 22；Air inlet
Inserted terminal 21 offers inlet channel 211 along its axial direction, and inlet channel 211 is connected with air admission hole 111, outlet inserted terminal 22 along its
Outlet passageway 221 axially is offered, outlet passageway 221 is connected with venthole 121；Support stick 2 is close to its air inlet inserted terminal 21
Position offers air inlet passage 212, and outlet passage 222, air inlet ventilation are offered close to the position of its outlet inserted terminal 22
Hole 212 and outlet passage 222 are multiple, and respectively along the circumferentially distributed of support stick 2, the connection air inlet of air inlet passage 212
The inner chamber of passage 211 and housing 1, the inner chamber of the connection outlet passageway 221 of outlet passage 222 and housing 1.
The optical gas absorbance pond that the present embodiment is provided, including for being passed through the air admission hole 111 of gas to be detected and being used for
The venthole 121 of gas or gas to be detected in housing 1 is excluded, wherein, support stick 2 is used to support whole device, and for connecting
Lead to gas to be detected and air absorbing cavity 6.Optical absorption pond mainly utilize Lambert-Beer's law, i.e., gas to be detected to through
The directional light of certain wavelength therein carries out the absorption of light intensity, its absorbance and the concentration and absorber thickness of gas to be detected
(i.e. effective light path of the laser in the gas to be detected) is directly proportional.
The optical gas absorbance pond mainly includes gas circuit and light path：Wherein, gas circuit flow direction is as follows, to the air admission hole of housing 1
111 are passed through gas to be detected, and gas to be detected is ventilated by the inlet channel 211 of the air inlet inserted terminal 21 of support stick 2 from air inlet
Hole 212 enters original gas in air absorbing cavity 6, air absorbing cavity 6 and is extruded going out from the outlet inserted terminal 22 of support stick 2
Gas passage 222 enters, and sequentially passes through eluting gas absorbing cavity 6 after outlet passageway 221 and venthole 121；Light path flow direction is as follows,
Laser can be by setting window to inject in the inner chamber of housing 1 on housing 1, or the exit portal of laser is located in housing 1
Directly launch in chamber, the window set from housing 1 projects or receives laser signal by other reception devices.Support stick 2 is set
Put in the inner chamber of housing 1, gas to be detected is from the air inlet passage 212 of the one end of support stick 2 along support stick 2 circumferentially around one
Week is passed through, and is discharged from the outlet passage 222 of the other end, and gas displacement speed is very fast, and to the gas in the inner chamber of housing 1
Body displacement is fully without dead angle, so as to improve the detection efficiency of optical gas sensor.
In addition, the diameter of air inlet inserted terminal 21 and outlet inserted terminal 22 can be set smaller than it positioned at shell by support stick 2
The diameter in the stage casing of the inner chamber of body 1, not only beneficial to the grafting of the two ends of support stick 2 and housing 1, its stage casing is relatively large in diameter, and takes body
Product is larger, accordingly, and the volume that the inner chamber of housing 1 accommodates gas to be detected reduces, so as to further increase optical gas absorbance
The gas displacement speed in pond, improves the speed of response and detection efficiency of optical gas sensor.
Specifically, in the present embodiment, as shown in Figures 2 and 3, multiple air inlet passages 212 are uniform along the circumference of support stick 2
Distribution；Circumference of multiple outlet passages 222 along support stick 2 is uniformly distributed.Gas to be detected enters shell from air inlet passage 212
, can be uniform around outlet along circumferential 360 ° of support stick 2 when in the inner chamber of body 1, gas enters more rapid in the inner chamber of housing 1,
And each corner of the inner chamber of housing 1 can obtain the displacement of gas to be detected, without dead angle, so as to improve the gas of the inner chamber of housing 1
The accuracy of detection of body replacement rate and optical gas sensor.
In the present embodiment, as shown in Fig. 2 the air inlet inserted terminal 21 of support stick 2 is equipped with incidence reflection mirror 3, incidence reflection
Mirror 3 is provided with incidence window piece；Outlet inserted terminal 22 is equipped with outgoing speculum 4, and outgoing speculum 4 is provided with exit window
Piece, the minute surface of incidence reflection mirror 3 and outgoing speculum 4 is oppositely arranged；The company of sealing between incidence reflection mirror 3 and outgoing speculum 4
Sleeve 5 is connected to, three is collectively forming air absorbing cavity 6.
Add after incidence reflection mirror 3 and outgoing speculum 4, the gas circuit in the optical gas absorbance pond is constant, and light path is as follows：Swash
Light is injected at a certain angle from the incidence window piece on incidence reflection mirror 3, and laser is then in incidence reflection mirror 3 and outgoing speculum
Multiple reflections between 4, are finally projected from the exit window piece on outgoing speculum 4.Incidence reflection mirror 3, sleeve 5 and outgoing reflection
Mirror 4 collectively constitutes the air absorbing cavity 6 for accommodating gas to be detected, and laser is located at the gas by effective light path that gas to be detected absorbs
In body absorbing cavity 6, laser multiple reflections between incidence reflection mirror 3 and outgoing speculum 4 are ensuring laser in gas to be detected
In on the basis of effective light path for passing through, substantially reduce the volume of air absorbing cavity 6, and then reduce optical gas absorbance pond
Volume, so as to improve the gas displacement speed in accommodating chamber, accordingly improve optical gas sensor response speed and
Detection efficiency.In addition, setting air inlet passage 212 around the mode and light path of outlet in the inner ring of air absorbing cavity 6 on support stick 2
It is corresponding around one week, the speed of response and detection efficiency of optical gas sensor are further increased, detection time is generally less than
5s。
The concentration of gas to be detected is influenceed in order to reduce the inner surface of air absorbing cavity 6, specifically, can be in incidence reflection
Gold-plated processing is done on the mirror surface of mirror 3 and outgoing speculum 4, sleeve 5 can select Teflon sleeve, two gold-plated speculums
The inwall of face and Teflon sleeve is collectively forming the inner surface of air absorbing cavity 6, when gas to be detected is corrosive gas, gas
The probability very little that the inner surface of body absorbing cavity 6 reacts with corrosive gas, the concentration on gas to be detected influences very little, from
And improve the accuracy of detection of system.
Furthermore it is also possible to detachable fixation will be set to even between sleeve 5 and incidence reflection mirror 3, outgoing speculum 4
Connect, i.e. the spacing between incidence reflection mirror 3 and outgoing speculum 4 can be adjusted, so as to change laser in air absorbing cavity 6
Effective light path.Specifically, the position of incidence reflection mirror 3 is constant, by changing the sleeve 5 of different length and accordingly changing
The position of speculum 4 is penetrated, so as to realize the regulation to laser effective light path in air absorbing cavity 6.
In the present embodiment, as shown in Figures 2 and 3, the inner surface of the intake section 11 of housing 1 axially extending has air inlet to determine along its
Position block 112, air inlet locating piece 112 offers air inlet inserting groove 113 along its axial direction, and air inlet inserting groove 113 connects with air admission hole 111
It is logical；The inner surface in the outlet portion 12 of housing 1 along its it is axially extending have outlet locating piece 122, outlet locating piece 122 is opened along its axial direction
Provided with outlet inserting groove 123, outlet inserting groove 123 is connected with venthole 121；The air inlet inserted terminal 21 of support stick 2 be plugged in into
In gas inserting groove 113, the outlet inserted terminal 22 of support stick 2 is plugged in outlet inserting groove 123；The sealing of incidence reflection mirror 3 is arranged
In in the outer peripheral sidewall of air inlet locating piece 112, the sealing shroud of outgoing speculum 4 is in the outer peripheral sidewall of outlet locating piece 122.
Reflection of the laser between incidence reflection mirror 3 and outgoing speculum 4 is to incidence reflection mirror 3 and outgoing speculum 4
Angle sets required precision very high, and air inlet of the air inlet locating piece 112 simultaneously to incidence reflection mirror 3 and support stick 2 here is inserted
Connect the progress position of end 21 to fix, outlet locating piece 122 is simultaneously carried out the outlet inserting groove 123 of outgoing speculum 4 and support stick 2
Position is fixed, after the intake section 11 of housing 1 and the fixation of the position of outlet portion 12, i.e. air inlet locating piece 112 and outlet locating piece 122
Position fix, accordingly, the position of the position of support stick 2, the position of incidence reflection mirror 3 and outgoing speculum 4 is fixed,
So as to strengthen the stability in optical gas absorbance pond, it is ensured that effective light path of laser, the measurement essence of optical gas sensor is improved
Degree.Specifically, air inlet locating piece 112 and outlet locating piece 122 can be arranged on the axis of air absorbing cavity 6, so,
Support stick 2 also is located on the axis of air absorbing cavity 6, the displacement of axial symmetry, more conducively gas in whole air absorbing cavity 6.
In the present embodiment, sealing ring is provided between incidence reflection mirror 3 and sleeve 5；Set between outgoing speculum 4 and sleeve 5
There is sealing ring.Sealing ring further strengthens the sealing effectiveness between sleeve 5 and incidence reflection mirror 3, outgoing speculum 4, it is ensured that gas
The sealing of body absorbing cavity 6, reduces and even avoids detection error caused by gas leak to be detected.
Specifically, in the present embodiment, incidence window piece and the exit window piece are vertically outside from up to down
Tilt 8 ° of inclinations angle.Laser can produce noise in communication process due to the difference of amplitude, phase or frequency, laser noise meeting
Accuracy of detection on optical gas sensor produces influence, show that incidence window piece is vertically set from up to down through experiment
When being set to outward-dipping 8 ° of inclination angle, laser generation noise is less, and Detection results are more excellent.In addition, in order to reduce laser noise
Influence to testing result, the coating film treatment and housing 1 that can also improve incidence reflection mirror 3 and the minute surface of outgoing speculum 4 is sent out
Black processing etc..
In the present embodiment, incidence window piece and exit window piece can select CaF2Structural member.CaF2What material was made enters
Penetrating diaphragm and exit window piece has low absorption coefficient, high damage threshold, smaller on the influence of the light intensity of laser, so as to improve and be
The accuracy of detection united to gas to be detected.In addition, can necessarily journey from the less incidence window piece of thickness and exit window piece
Degree reduces the optical noise of laser, improves accuracy of detection of the system to gas to be detected.In addition, incidence window piece and exit window
Piece can also be made from materials such as ZnSe (tin zinc), KBr (KBr), sapphires.
In the present embodiment, it as shown in Figure 2 and Figure 4, can also seal provided with observation window 7, be opened up on housing 1 on sleeve 5
There is peep hole, peep hole is corresponding with observation window 7.The setting of observation window 7 can facilitate operating personnel's early stage to pass through to laser light
The observation on road completes the debugging to incidence reflection mirror 3 and outgoing speculum 4, also allows for observation of the later stage to laser optical path.Tool
Body, observation window 7 can select windowpane or other transparency windows, can break fluid sealant between observation window 7 and sleeve 5, it is ensured that
The sealing of observation window 7.In addition, when gas to be detected is corrosive gas, sleeve 5 can select Teflon sleeve, can be with
Peep hole is also opened up on Teflon sleeve, after being debugged by peep hole to system, the Teflon of corrosion resistance is used
Rubber slab carries out encapsulation process to peep hole；When gas non-corrosiveness to be detected or smaller corrosivity, such as：O2, NO, CO and NO2
Deng gas, sleeve 5 can also directly select glass sleeve, be formed between glass sleeve and incidence reflection mirror 3 and outgoing speculum 4
Sealed absorbing cavity 6, now, glass sleeve can be used for observation, it is no longer necessary to open up observation window 7, wherein, for corrosion resistant
The glass sleeve that corrosion glass material, such as sapphire are made, can be used for the sealing and observation of corrosivity gas to be detected.
In the present embodiment, the temperature sensor for measuring gas temperature in air absorbing cavity 6 is installed with housing 1.It is logical
Excess temperature sensor measures the accurate temperature of gas to be detected in air absorbing cavity 6, the temperature can be used for into follow-up number
Proofreaded according to the temperature of processing, so as to obtain the related precise results of gas to be detected, improve the accuracy of detection of system, specifically,
Temperature sensor can select PT100 temperature sensors.Further, it is also possible to be installed with housing 1 for measuring gas absorption
The pressure sensor of gas pressure in chamber 6, pressure compensation is carried out with the pressure in handling follow-up data, can be also used for understanding
Gas pressure situation in air absorbing cavity 6.
In the present embodiment, air admission hole 111 is symmetrical arranged with venthole 121 on housing 1.Air admission hole 111 and venthole 121
It is symmetrical arranged, gas to be detected is consistent with the speed for excluding air absorbing cavity 6 etc. into air absorbing cavity 6, so that it is guaranteed that to be checked
The smooth circulation of gas is surveyed, the gas displacement speed in air absorbing cavity 6 is improved, and then improve the detection efficiency of system.
Embodiment two
The present embodiment provides a kind of optical gas sensor, including laser beam emitting device and the optics gas described in embodiment one
Body absorption cell, the laser emitting mouthful of laser beam emitting device is connected with the incidence window piece in optical gas absorbance pond；Optical gas is inhaled
The exit window piece of receives pond is connected with signal processing apparatus, and the optical gas sensor has the institute in above-mentioned optical gas absorbance pond
There is technique effect, repeat no more here.
The optical gas sensor that the present embodiment is provided, wherein, the operation principle in optical gas absorbance pond has been done above
It is described in detail, here repeats no more.Laser beam emitting device injects laser to the incidence window piece in optical gas absorbance pond, passes through
The laser entering signal processing unit projected behind optical gas absorbance pond, the related concentrations for obtaining gas to be detected through processing are believed
Breath, so as to realize the Concentration Testing to gas to be detected.It is corresponding with optical gas absorbance pond, the sound of the optical gas sensor
Answer that speed is fast, detection efficiency is high.
Specifically, laser beam emitting device can include generating laser and optical fiber collimator, signal processing apparatus can be wrapped
Include the detector being sequentially connected electrically, preamplifier, lock-in amplifier, A/D converter and microprocessor, wherein generating laser
For outwards launching the laser matched with gas to be detected, laser enters in light collimator, and optical fiber collimator is to receiving
Laser collimated, optics gas absorption cell is then injected by laser emitting mouthful, laser is treated in optical gas absorbance pond
After detecting that gas absorbs, projected from exit window piece and enter detector, the optical signal received is transformed into by detector to be carried
The electric signal of gas concentration information, and the electric signal is passed into follow-up preamplifier, preamplifier enters to the electric signal
Row I/V is changed and voltage amplification, then goes out the second harmonic being directly proportional to gas concentration by the harmonic detecting of lock-in amplifier
Signal, corresponding data signal is converted to finally by A/D converter, and microprocessor is handled the data signal, most
The concentration information of gas to be detected is obtained eventually, completes the detection to gas to be detected.
Finally it should be noted that：Various embodiments above is only limited to illustrate the technical solution of the utility model, rather than to it
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, or to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (10)
1. a kind of optical gas absorbance pond, it is characterised in that including housing (1) and support stick (2), the housing (1) be provided with into
Offer and offered on air admission hole (111), the outlet portion (12) on gas portion (11) and outlet portion (12), the intake section (11)
Venthole (121)；The support stick (2) is plugged in the inner chamber of the housing (1), and described support stick (2) one end is air inlet grafting
Hold (21), the other end is outlet inserted terminal (22)；The air inlet inserted terminal (21) offers inlet channel (211) along its axial direction,
The inlet channel (211) connects with the air admission hole (111), and the outlet inserted terminal (22) offers outlet along its axial direction and led to
Road (221), the outlet passageway (221) connects with the venthole (121)；
The support stick (2) offers air inlet passage (212) close to the position of its air inlet inserted terminal (21), is inserted close to its outlet
The position for connecing end (22) offers outlet passage (222), the air inlet passage (212) and the outlet passage (222)
It is multiple, and respectively along the circumferentially distributed of the support stick (2), the air inlet passage (212) connects the inlet channel
(211) with the inner chamber of the housing (1), the outlet passage (222) connects the outlet passageway (221) and the housing
(1) inner chamber.
2. optical gas absorbance pond according to claim 1, it is characterised in that multiple air inlet passage (212) edges
The circumference of the support stick (2) is uniformly distributed；Multiple outlet passages (222) are uniform along the circumference of the support stick (2)
Distribution.
3. optical gas absorbance pond according to claim 1 or 2, it is characterised in that the air inlet grafting of the support stick (2)
End (21) is equipped with incidence reflection mirror (3), and the incidence reflection mirror (3) is provided with incidence window piece；The outlet inserted terminal
(22) be equipped with outgoing speculum (4), the outgoing speculum (4) is provided with exit window piece, the incidence reflection mirror (3) with
The minute surface of the outgoing speculum (4) is oppositely arranged；Sealed between the incidence reflection mirror (3) and the outgoing speculum (4)
Sleeve (5) is connected with, three is collectively forming air absorbing cavity (6).
4. optical gas absorbance pond according to claim 3, it is characterised in that the intake section (11) of the housing (1)
Inner surface along its it is axially extending have air inlet locating piece (112), the air inlet locating piece (112) offers air inlet grafting along its axial direction
Groove (113), the air inlet inserting groove (113) connects with the air admission hole (111)；
The inner surface in the outlet portion (12) of the housing (1) along its it is axially extending have an outlet locating piece (122), the outlet positioning
Block (122) offers outlet inserting groove (123) along its axial direction, and the outlet inserting groove (123) connects with the venthole (121)
It is logical；
The air inlet inserted terminal (21) of the support stick (2) is plugged in the air inlet inserting groove (113), the support stick (2)
Outlet inserted terminal (22) is plugged in the outlet inserting groove (123)；Incidence reflection mirror (3) sealing shroud is located at the air inlet
In the outer peripheral sidewall of locating piece (112), outgoing speculum (4) sealing shroud is located at the periphery of the outlet locating piece (122)
On the wall of side.
5. optical gas absorbance pond according to claim 4, it is characterised in that the incidence reflection mirror (3) and the set
Sealing ring is provided between cylinder (5)；Sealing ring is provided between the outgoing speculum (4) and the sleeve (5).
6. optical gas absorbance pond according to claim 5, it is characterised in that the incidence window piece and the exit window
Mouthful piece vertically outward-dipping 8 ° of inclinations angle from up to down.
7. optical gas absorbance pond according to claim 6, it is characterised in that the incidence window piece and the exit window
Mouth piece selects CaF2Structural member.
8. optical gas absorbance pond according to claim 7, it is characterised in that sealing is provided with observation on the sleeve (5)
Peep hole is offered on window (7), the housing (1), the peep hole is corresponding with the observation window (7).
9. optical gas absorbance pond according to claim 8, it is characterised in that be installed with the housing (1) for surveying
Measure the temperature sensor of the air absorbing cavity (6) interior gas temperature.
10. a kind of optical gas sensor, it is characterised in that including any one of laser beam emitting device and claim 3-9 institute
The optical gas absorbance pond stated, the laser emitting mouthful and the incidence window in the optical gas absorbance pond of the laser beam emitting device
Piece is connected；The exit window piece in the optical gas absorbance pond is connected with signal processing apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720103106.3U CN206479449U (en) | 2017-01-23 | 2017-01-23 | Optical gas absorbance pond and optical gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720103106.3U CN206479449U (en) | 2017-01-23 | 2017-01-23 | Optical gas absorbance pond and optical gas sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206479449U true CN206479449U (en) | 2017-09-08 |
Family
ID=59753822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201720103106.3U Active CN206479449U (en) | 2017-01-23 | 2017-01-23 | Optical gas absorbance pond and optical gas sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303376A (en) * | 2017-12-15 | 2018-07-20 | 复旦大学 | The multi-chamber series connection gas sample cell of built-in reflective mirror |
| CN109001154A (en) * | 2018-06-13 | 2018-12-14 | 贾良权 | The efficient measuring system of seed vitality based on laser absorption spectroscopy |
| TWI668427B (en) * | 2018-05-09 | 2019-08-11 | 南臺學校財團法人南臺科技大學 | Optical detection device for gas trace concentration |
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2017
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303376A (en) * | 2017-12-15 | 2018-07-20 | 复旦大学 | The multi-chamber series connection gas sample cell of built-in reflective mirror |
| TWI668427B (en) * | 2018-05-09 | 2019-08-11 | 南臺學校財團法人南臺科技大學 | Optical detection device for gas trace concentration |
| CN109001154A (en) * | 2018-06-13 | 2018-12-14 | 贾良权 | The efficient measuring system of seed vitality based on laser absorption spectroscopy |
| CN109001154B (en) * | 2018-06-13 | 2021-04-09 | 湖州师范学院 | Efficient seed vigor measuring system based on laser absorption spectrum technology |
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