CN109781651A - A kind of gas detection cell and infrared gas alarm - Google Patents
A kind of gas detection cell and infrared gas alarm Download PDFInfo
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- CN109781651A CN109781651A CN201910161246.XA CN201910161246A CN109781651A CN 109781651 A CN109781651 A CN 109781651A CN 201910161246 A CN201910161246 A CN 201910161246A CN 109781651 A CN109781651 A CN 109781651A
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- 238000001514 detection method Methods 0.000 title claims abstract description 69
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 18
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 8
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- 235000019441 ethanol Nutrition 0.000 description 5
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- 238000012937 correction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007717 exclusion Effects 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
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Abstract
The present invention relates to a kind of gas detection cell and infrared gas alarms, wherein, gas detection cell includes: the end of probe (12) for exporting the source ends of infrared light (11), for receiving the infrared light of the source ends (11) sending and detecting；The source ends (11) include: for exporting the light source of the infrared light (111), for converging the first reflector (112) of the infrared light；The end of probe (12) includes: with the multi channel detector (121) for detecting the infrared light, for converging the infrared light received and being transmitted to the second reflector (122) of the multi channel detector (121)；First reflector (112) and second reflector (122) are respectively hollow cylindrical body.The present invention uses open type design, at low cost without configuring gas chamber and pump desorption system, high reliablity and precision height.
Description
Technical field
The present invention relates to a kind of gas sensor technical field more particularly to a kind of gas detection cell and infrared gas reports
Alert device.
Background technique
In recent years, domestic gas user constantly rises, and demand and attention rate of the people to fuel gas alarm also increase, still
Resident gradually reduces the satisfaction of fuel gas alarm, mainly the reason is as follows that: 1, the most alarm in current market is using electrification
Learn, semiconductor and principle of catalyst combustion, product sensitivity, precision, in terms of Shortcomings, especially wrong report,
The rate of misrepresenting deliberately has perplexed resident, gas company and Fire Department；2, infrared gas sensor have precision it is high, selectivity good, sensitivity
The advantages that height, the service life is long, but since current production is vulnerable to environmental pollution, prover time is longer, it is expensive, and measure gas
Body is single, big for the identification difficulty of the gas of complex component.
Summary of the invention
The purpose of the present invention is to provide a kind of gas detection cell and infrared gas alarms, and it is low to solve detection accuracy
Problem.
For achieving the above object, the present invention provides a kind of gas detection cell, comprising: for exporting the light of infrared light
Source, for receiving the infrared light and the end of probe detected that the source ends issue；The source ends include: described for exporting
The light source of infrared light, for converging the first reflector of the infrared light；
The end of probe include: with the multi channel detector for detecting the infrared light, for converge receive it is described red
Outer light and the second reflector for being transmitted to the multi channel detector；
First reflector and second reflector are respectively hollow cylindrical body.
According to an aspect of the present invention, the source ends further include: first window piece, the light source and first window
Mouth piece is separately positioned on the opposite both ends of first reflector, and the light source, first reflector and first window
The link position of mouth piece seals against each other setting；
The end of probe further include: the second diaphragm, the multi channel detector and second diaphragm are respectively set
At the opposite both ends of second reflector, and the company of multi channel detector, second reflector and second diaphragm
It connects position and seals against each other setting.
According to an aspect of the present invention, the multi channel detector is provided with the optical filter of at least two wave bands；Wherein,
The optical filter of at least one wave band is used for reference path, remaining described optical filter is used for the light path of object gas.
According to an aspect of the present invention, the optical filter is no temperature drift optical filter.
According to an aspect of the present invention, side and second diaphragm of the first window piece far from the light source
Side far from the multi channel detector is plated respectively is formed with protective film.
According to an aspect of the present invention, the wave band of the infrared light of the light source output covers medium-wave infrared and long wave
It is infrared.
According to an aspect of the present invention, first reflector and second reflector are inner wall using paraboloidal
Hollow tube-shape body.
For achieving the above object, the present invention provides a kind of infrared gas alarm, comprising: gas detection cell, with
The control unit of gas detection cell electrical connection, and for supporting the gas detection cell and described control unit
Shell；
Described control unit is fixed at the case inside, and the gas detection cell is fixedly supported upon the shell
Outside.
According to an aspect of the present invention, the source ends in the gas detection cell and end of probe it is opposite interval setting
In the outside of the shell.
According to an aspect of the present invention, described control unit include: power conversion module, pulse mode conversion module,
Amplification circuit module, signal processing module and sound and light alarm module altogether；
The power conversion module is electrically connected with the pulse mode conversion module and the amplification circuit module altogether respectively；
The pulse mode conversion module is electrically connected with the source ends；
The amplification circuit module altogether is electrically connected with the end of probe, and the end of probe is electrically connected with the signal processing module
It connects, the signal processing module and sound and light alarm module electrical connection.
According to an aspect of the present invention, the pulse mode conversion module receives the straight of the power conversion module output
Galvanic electricity signal is simultaneously converted to the square wave electrical signal to work for the source ends, and the source ends is driven to issue continuous square wave formula light
Signal
According to an aspect of the present invention, described control unit further include: the temperature and humidity for detecting temperature and humidity passes
Sensor；
The Temperature Humidity Sensor is electrically connected to each other with the signal processing module.
According to an aspect of the present invention, further includes: be provided with the protective cover of pierced pattern；
The side that the shell installs the gas detection cell is arranged in the protective cover.
A kind of scheme according to the present invention, the present invention use open type design, without configuring gas chamber and pump desorption system, cost
It is low, high reliablity.
A kind of scheme according to the present invention, the optical signal that source ends and end of probe can be effectively improved by the way that reflector is arranged pass
Defeated efficiency, to make up due to the bring energy loss under open environment, so that gas detection cell of the invention does not need
Traditional gas chamber, which is arranged, can be realized detection to gas, not only ensure that detection accuracy, but also simplify gas detection cell
Structure, reduce costs.
A kind of scheme according to the present invention, by using multi-channel type detector is used, to effectively solve due to target
Gas is located at the overlap of spectral lines bring signal interference problem of medium-wave infrared and long wave infrared region, to further increase device
Anti-interference ability, improve detection accuracy.Especially for there are detection accuracy when various ingredients in object gas can
It is effectively ensured.For example, there are also when the ingredients such as methane, acetic acid, ethyl alcohol in object gas, by using multi-channel type detector
Methane can not only be effectively extracted, interference gas such as acetic acid, the Spectral Characteristic absorption signal of ethyl alcohol can also be actually in device layer
Face is realized to methane, and the measurement comprising hydroxyl, carboxyl substance, to realize the exclusion influenced on interference gas, and is realized
To the measurement of methane actual concentrations in interference gas atmosphere, correct pre-warning signal is issued, efficiently solves existing apparatus presence
Wrong report problem.
A kind of scheme according to the present invention is sealed one end of diaphragm and reflector, by the way that diaphragm is arranged to make
Reflector and diaphragm constitute the space of a sealing, make the light source sealed and multi channel detector not with the gas in external environment
Body contact, so as to avoid the interference and pollution of external environment, not only ensure that device energy steady operation, ensure that of the invention
Detection accuracy, and the service life of device has been effectively ensured.It is thereby achieved that source ends and end of probe of the invention are directly answered
For the high stability in open environment, long life requirement.
A kind of scheme according to the present invention is coated with protective film on diaphragm, when diaphragm stains under serious conditions, Yong Huke
It voluntarily wipes, without being damaged, and then effectively reduces the operation and maintenance cost of source ends and end of probe.
A kind of scheme according to the present invention can have by configuring single channel or multichannel reference path on multi channel detector
Effect solves light source due to room temperature, curent change bring radiation of light source energy deviation, by will test optical path signal and reference light
Road signal compares, to be effectively reduced due to the disturbing factors bring wrong report risk such as diaphragm pollution, further increases
Detection accuracy of the invention.
A kind of scheme according to the present invention, optical filter can be effectively eliminated using no temperature drift optical filter due to temperature variation band
The influence of the optical filter band logical offset come, so it is accurately advantageous to the stabilization of guarantee end of probe output signal, it further enhances
Detection accuracy of the invention.
A kind of scheme according to the present invention, in infrared gas alarm of the invention by using total amplifying circuit and multi-pass
Road detector is electrically connected to each other, and after being compared in multi channel detector using light path signal and reference path signal
It generates and determines as a result, reducing or avoiding in turn influence when occurring situations such as circuit aging to testing result.Therefore, pass through
Using total amplifying circuit and multichannel integrated detector technologies, the factors bring signal intensity shadow such as circuit aging can be effectively solved
It rings.
A kind of scheme according to the present invention can carry out the temperature of use environment, humidity by setting Temperature Humidity Sensor
Monitoring is realized by the built-in algorithm of control unit and carries out real time correction to the detection data that end of probe exports, exclude temperature and humidity
Influence to units test result, keeps monitoring accuracy of the invention more preferable at the case where further decreasing wrong report.
A kind of scheme according to the present invention, the apparatus structure is simple, it is easy to assembly, it can be achieved that device extensive mass
Production.
Detailed description of the invention
Fig. 1 schematically shows a kind of structure chart of the gas detection cell of embodiment according to the present invention；
Fig. 2 schematically shows a kind of structure chart of the infrared gas alarm of embodiment according to the present invention；
Fig. 3 schematically shows a kind of structural exploded view of the infrared gas alarm of embodiment according to the present invention；
Fig. 4 schematically shows a kind of structure chart of embodiment control unit according to the present invention.
Specific embodiment
It, below will be to embodiment in order to illustrate more clearly of embodiment of the present invention or technical solution in the prior art
Needed in attached drawing be briefly described.It should be evident that the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skills without creative efforts, can also be according to these
Attached drawing obtains other attached drawings.
When being described for embodiments of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower", " preceding ",
" rear ", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", orientation or positional relationship expressed by "outside" are based on phase
Orientation or positional relationship shown in the drawings is closed, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore above-mentioned term cannot
It is interpreted as limitation of the present invention.
The present invention is described in detail with reference to the accompanying drawings and detailed description, embodiment cannot go to live in the household of one's in-laws on getting married one by one herein
It states, but therefore embodiments of the present invention are not defined in following implementation.
As shown in Figure 1, a kind of embodiment according to the present invention, a kind of gas detection cell of the invention, comprising: light source
End 11 and end of probe 12.In the present embodiment, source ends 11 and end of probe 12 are oppositely arranged, and source ends 11 and detection
End 12 has interval between each other.In the present embodiment, source ends 11 issue infrared light, and infrared light is by source ends 11 and visits
Enter end of probe 12 after surveying the spacing distance between end 12, end of probe 12 detects the infrared light received.In this implementation
In mode, gas detection cell of the invention is directly placed in open environment to be measured, around source ends 11 and end of probe 12
Then it is filled with gas.It is red when the infrared light that source ends 11 issue passes through the spacing distance between source ends 11 and end of probe 12
Gas in outer light and environment to be measured interacts, and characteristic absorption is formed in characteristic wave bands, to form carrying characteristic absorption
Infrared signal.End of probe 12 is detected after receiving infrared signal and exports detection signal.It is according to the present invention another
A kind of embodiment can also change infrared light by structures such as setting prisms between source ends 11 and the interval of end of probe 12
Transmission direction can guarantee that the detected end 12 of infrared light that source ends 11 export receives, it is not limited to by 11 He of source ends
End of probe 12 is oppositely arranged.
As shown in Figure 1, a kind of embodiment according to the present invention, source ends 11 include: light source 111 and the first reflector
112.In the present embodiment, the infrared light that source ends 11 export is all as produced by light source 111.Light source 111 exports infrared
The wave band of light covers medium-wave infrared and LONG WAVE INFRARED.In the present embodiment, the wave band for the infrared light that light source 111 exports is 2-14
Micron.
In the present embodiment, the first reflector 112 is hollow cylindrical body.Light source 111 and the first reflector 112 are coaxial
One end that the first reflector 112 is set.In the present embodiment, the first reflector 112 is that inner wall uses in paraboloidal
Empty tube shape body.By the reflex of 112 inner surface of the first reflector (i.e. inner wall surface), the infrared light that light source 111 is issued
Directional light is converged and become, and then source ends 11 is enable to export parallel infrared light.By the way that the first reflector 112 is arranged
The delivery efficiency of source ends 11 can be effectively improved, to make up due to the bring energy loss under open environment, so that this hair
Bright gas detection cell, which does not need to be arranged traditional gas chamber, can be realized detection to gas, not only ensure that detection accuracy,
And the structure of gas detection cell is simplified, it reduces costs.
As shown in Figure 1, a kind of embodiment according to the present invention, end of probe 12 includes: multi channel detector 121 and second
Reflector 122.In the present embodiment, the second reflector 122 is hollow cylindrical body.In the present embodiment, the second reflection
Cover 122 uses paraboloidal hollow tube-shape body for inner wall.The setting coaxial with the second reflector 122 of multi channel detector 121 exists
One end of second reflector 122.The infrared light that source ends 11 issue is into behind the interval crossed between source ends 11 and end of probe 12
Into the second reflector 122.It is converged under the reflex of the second reflector 122 and is transmitted to multi channel detector 121.
By using multi-channel type detector is used, to effectively solve to be located at medium-wave infrared and long wave infrared region due to object gas
Overlap of spectral lines bring signal interference problem improve detection accuracy to further increase the anti-interference ability of device.Especially
It is for there are detection accuracy when various ingredients to be effectively ensured in object gas.For example, in object gas also
When there are the ingredients such as methane, acetic acid, ethyl alcohol, methane, interference gas can not only be effectively extracted by using multi-channel type detector
Such as acetic acid, the Spectral Characteristic absorption signal of ethyl alcohol can also be realized to methane, and include hydroxyl, carboxyl object actually in device level
The measurement of matter to realize the exclusion influenced on interference gas, and is realized in interference gas atmosphere to methane actual concentrations
Measurement, issue correct pre-warning signal, efficiently solve the problems, such as wrong report existing for existing apparatus.In addition, anti-by setting second
The receiving efficiency of end of probe 12 can be effectively improved by penetrating cover 122, to make up due to the bring energy loss under open environment, be made
Gas detection cell of the invention does not need to be arranged traditional gas chamber detection to gas can be realized, not only ensure that detection
Precision, and the structure of gas detection cell is simplified, it reduces costs.
As shown in Figure 1, a kind of embodiment according to the present invention, source ends 11 further include: first window piece 113.At this
In embodiment, light source 111 and first window piece 113 are separately positioned on the opposite both ends of the first reflector 112, and light source 111,
The link position of first reflector 112 and first window piece 113 seals against each other setting.In the present embodiment, light source 111 and
One diaphragm 113 can be sealed respectively with 112 connection of the first reflector by bonding mode.By the way that the first window is arranged
Mouth piece 113, one end of first window piece 113 and the first reflector 112 is sealed, to make the first reflector 112 and the first window
Mouth piece 113 constitutes the space of a sealing, and when light source 111 is mounted on the other end of the first reflector 112, light source 111 is by first
The sealing space isolation that reflector 112 and first window piece 113 are constituted, contacts light source 111 with the gas in external environment,
Interference and pollution so as to avoid external environment to light source 111 not only ensure that light source 111 can be stablized and issue infrared light, protect
Detection accuracy of the invention has been demonstrate,proved, and the service life of light source 111 has been effectively ensured.It is thereby achieved that light source of the invention
End 11 directly applies to high stability in open environment, long life requirement.
In the present embodiment, first window piece 113 is formed with protective film far from the side plating of light source 111.In this embodiment party
In formula, protective film is the plated film (such as: DLC film) of resistance to wiping, and when first window piece 113 stains under serious conditions, user can be voluntarily
Wiping, without being damaged, and then effectively reduces the operation and maintenance cost of source ends 11.
As shown in Figure 1, a kind of embodiment according to the present invention, end of probe 12 further include: the second diaphragm 123.At this
In embodiment, multi channel detector 121 and the second diaphragm 123 are separately positioned on the opposite both ends of the second reflector 122, and
The link position of multi channel detector 121, the second reflector 122 and the second diaphragm 123 seals against each other setting.In this embodiment party
In formula, multi channel detector 121 and the second diaphragm 123 can pass through bonding side with 122 connection of the second reflector respectively
Formula is sealed.By the way that the second diaphragm 123 is arranged, one end of the second diaphragm 123 and the second reflector 122 is sealed, from
And the second reflector 122 and the second diaphragm 123 is made to constitute the space of a sealing, multi channel detector 121 is mounted on second
When the other end of reflector 122, the sealing that multi channel detector 121 is constituted by the second reflector 122 and the second diaphragm 123 is empty
Between be isolated, contact multi channel detector 121 with the gas in external environment, so as to avoid external environment to multichannel visit
The interference and pollution for surveying device 121 not only ensure that multi channel detector 121 can be stablized and receive infrared light, ensure that of the invention
Detection accuracy, and the service life of multi channel detector 121 has been effectively ensured.It is thereby achieved that end of probe 12 of the invention
Directly apply to high stability in open environment, long life requirement.
In the present embodiment, the second diaphragm 123 is formed with protective film far from the side plating of multi channel detector 121.?
In present embodiment, protective film is the plated film (such as: DLC film) of resistance to wiping, under the second diaphragm 123 contamination serious conditions, is used
Family can voluntarily wipe, and without being damaged, and then effectively reduce the operation and maintenance cost of end of probe 12.
As shown in Figure 1, a kind of embodiment according to the present invention, multi channel detector 121 are provided at least two wave bands
Optical filter 1211.In the present embodiment, the optical filter 1211 of 121 at least one wave band of multi channel detector is as reference
Optical path uses, remaining optical filter 1211 is used as the light path of object gas.To have, there are four the multichannels in channel to visit
It is illustrated for survey device 121, in the present embodiment, there are four sense channels for the tool of multi channel detector 121, and then have four
The optical filter 1211 of different-waveband is planted, the reference path comprising a wave band filters in the optical filter 1211 of four kinds of wave bands
Piece, the light path optical filter of three wave bands.The wave band of optical filter for light path respectively corresponds different gases to be checked
Characteristic absorption peak, such as methane, ethyl alcohol, acetic acid.Certainly, multi channel detector 121 may be arranged as two channels, triple channel,
Five-channel etc., wherein the quantity of set optical filter is identical as port number, and the wave band of each optical filter 1211 is (i.e. one different
Wave band corresponds to an optical filter).In addition, the optical filter for reference path can also be two, three etc., when for reference light
When the optical filter on road is multiple, respectively for the wave band of the optical filter for reference path also difference, (i.e. a wave band is one corresponding
Optical filter), details are not described herein.By configuring single channel or multichannel reference path on multi channel detector 121, can effectively solve
Light source is due to room temperature, curent change bring radiation of light source energy deviation, by will test optical path signal and reference path signal
It compares, to be effectively reduced due to the disturbing factors bring wrong report risk such as diaphragm pollution, further improves this hair
Bright detection accuracy.
In the present embodiment, optical filter 1211 is no temperature drift optical filter.By this set, can effectively eliminate due to temperature
The influence of degree variation bring optical filter band logical offset, so it is accurately advantageous to the stabilization of guarantee 12 output signal of end of probe, into
One step enhances detection accuracy of the invention.
In conjunction with shown in Fig. 1, Fig. 2 and Fig. 3, a kind of embodiment according to the present invention, a kind of infrared gas report of the invention
Alert device, comprising: gas detection cell 1, control unit 2 and shell 3.In the present embodiment, control unit 2 and gas detection list
Member 1 is electrically connected to each other.Shell 3 is for supporting gas detection cell 1 and control unit 2.In the present embodiment, control unit 2
It is fixed at 3 inside of shell, gas detection cell 1 is fixedly supported upon 3 outside of shell.
In conjunction with shown in Fig. 1, Fig. 2 and Fig. 3, a kind of embodiment according to the present invention, the source ends in gas detection cell 1
11 and the opposite outside for being arranged at intervals on shell 3 of end of probe 12.In the present embodiment, it is provided in gas detection cell 1
Fixed structure 13.Fixed structure 13 includes positioning region 131 and interconnecting piece 132.Positioning region 131 and interconnecting piece 132 are connected with each other and exist
In present embodiment, interconnecting piece 132 is connected with the lower end of positioning region 131, by connector 133 can be realized fixed structure with
The interconnection of shell 3.In the present embodiment, positioning region 131 includes two locating plates being oppositely arranged, by locating plate with
Being stably connected with to source ends 11 or end of probe 12 of fixed structure 13 can be realized in the connection of source ends 11 or end of probe 12.At this
In embodiment, the groove of installation gas detection cell 1 is provided on the side of shell 3, fixed structure 13 is mutually interconnected with groove
Connecing can will be on the lateral surface of the fixed shell 3 of source ends 11 and end of probe 12.
In conjunction with shown in Fig. 3 and Fig. 4, a kind of embodiment according to the present invention, control unit 2 includes: power conversion module
21, pulse mode conversion module 22, altogether amplification circuit module 23, signal processing module 24 and sound and light alarm module 25.In this reality
It applies in mode, power conversion module 21 is electrically connected with pulse mode conversion module 22 and total amplification circuit module 23 respectively.Pulse
Mode conversion module 22 is electrically connected with source ends 11.Amplification circuit module 23 is electrically connected with end of probe 12 altogether, end of probe 12 and letter
Number processing module 24 is electrically connected, and signal processing module 24 and sound and light alarm module 25 are electrically connected.By above-mentioned setting, in the present invention
Infrared gas alarm be electrically connected to each other by using total amplifying circuit and multi channel detector 121, and multi-channel detection
It generates and is determined as a result, reducing or avoiding in turn after being compared in device 121 using light path signal and reference path signal
To the influence of testing result when occurring situations such as circuit aging.Therefore, it is visited by using total amplifying circuit and multichannel are integrated
Device technology is surveyed, can effectively solve the factors bring signal intensity such as circuit aging influences.
In the present embodiment, pulse mode conversion module 22 receives the DC signal of the output of power conversion module 21 simultaneously
The square wave electrical signal to work for source ends 11 is converted to, and source ends 11 is driven to issue continuous square wave formula optical signal (i.e. source ends
The light intensity of 11 infrared lights issued is the variation of square wave formula).
A kind of embodiment according to the present invention, control unit 2 further include: the temperature and humidity for detecting temperature and humidity passes
Sensor.In the present embodiment, Temperature Humidity Sensor is electrically connected to each other with signal processing module 24.By the way that temperature and humidity sensing is arranged
Device can be monitored the temperature of use environment, humidity, by the built-in algorithm of control unit 2, realize and export to end of probe 12
Detection data the case where carrying out real time correction, excluding influence of the temperature and humidity to units test result, further decrease wrong report, make
Monitoring accuracy of the invention is more preferable.
In conjunction with shown in Fig. 2 and Fig. 3, a kind of embodiment according to the present invention, shell 3 includes upper cover 31 and lower cover 32.?
In present embodiment, control unit 2 is integrated on a circuit board, is consolidated control unit 2 by the fastening of upper cover 31 and lower cover 32
It is scheduled in shell 3.
In conjunction with shown in Fig. 2 and Fig. 3, a kind of embodiment according to the present invention, infrared gas alarm of the invention is also wrapped
Include protective cover 4.In the present embodiment, protective cover 4 is provided with pierced pattern.The setting of protective cover 4 installs gas inspection in shell 3
The side of unit 1 is surveyed, i.e., what protective cover 4 and upper cover 31 mutually fastened is enclosed in inside for gas detection cell 1, and gas is avoided to examine
It surveys unit 1 to be collided, ensure that the installation accuracy and detection accuracy of gas detection cell 1.
In conjunction with attached drawing of the invention, workflow of the invention is illustrated.
S1. power conversion module 21 converts input voltage into the DC voltage for internal work, and DC voltage passes through company
It connects road and is divided into two-way transmission, a-road-through extra pulse mould group conversion module 22 is converted to the square wave letter used for source ends 11
Number, another way is that the multi channel detector 121 of end of probe 12 is powered by total amplification circuit module 23；
S2. light source 111 is driven by pulse mode conversion module 22, issues continuous square wave formula optical signal, via the first reflection
112 convergence of cover forms directional light and by first window piece 113, infrared light directly with the object gas phase interaction in external environment
With in characteristic wave bands formation characteristic absorption；
S3. the infrared signal of characteristic absorption is carried by the second diaphragm 123, through the second reflector 122, and is filtered
Piece 1211 imports multi channel detector 121.The light path and reference path of multi channel detector 121, obtain corresponding respectively
Characteristic absorption peak simultaneously exports electric signal；
S4. the signal processing module 24 of control unit 2 receives the electric signal that multi channel detector 121 exports, and carries out internal
Logical operation exports " normal ", the logical values such as Alarm, eventually by sound and light alarm module, exports " normal ", Alarm letter
Number.
Above content is only the example of concrete scheme of the invention, for the equipment and structure of wherein not detailed description, is answered
When being interpreted as that the existing common apparatus in this field and universal method is taken to be practiced.
The foregoing is merely a schemes of the invention, are not intended to restrict the invention, for the technology of this field
For personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (13)
1. a kind of gas detection cell, comprising: for exporting the source ends (11) of infrared light, for receiving the source ends (11)
The infrared light of sending and the end of probe (12) detected；It is characterized in that, the source ends (11) include: described infrared for exporting
The light source (111) of light, for converging the first reflector (112) of the infrared light；
The end of probe (12) includes: to use the multi channel detector (121) for detecting the infrared light, for converging the institute received
It states infrared light and is transmitted to the second reflector (122) of the multi channel detector (121)；
First reflector (112) and second reflector (122) are respectively hollow cylindrical body.
2. gas detection cell according to claim 1, which is characterized in that the source ends (11) further include: the first window
It is opposite that mouth piece (113), the light source (111) and the first window piece (113) are separately positioned on first reflector (112)
Both ends, and the link position of the light source (111), first reflector (112) and the first window piece (113) is mutual
Sealed set；
The end of probe (12) further include: the second diaphragm (123), the multi channel detector (121) and second window
Piece (123) is separately positioned on the opposite both ends of second reflector (122), and multi channel detector (121), described second are instead
The link position for penetrating cover (122) and second diaphragm (123) seals against each other setting.
3. gas detection cell according to claim 1 or 2, which is characterized in that multi channel detector (121) setting
There is the optical filter (1211) of at least two wave bands；Wherein, the optical filter (1211) of at least one wave band is used for reference light
Road, remaining described optical filter (1211) are used for the light path of object gas.
4. gas detection cell according to claim 3, which is characterized in that the optical filter (1211) is the optical filtering of no temperature drift
Piece.
5. gas detection cell according to claim 4, which is characterized in that the first window piece (113) is far from described
The side of light source (111) and second diaphragm (123) plate respectively far from the side of the multi channel detector (121) to be formed with
Protective film.
6. gas detection cell according to claim 5, which is characterized in that the light source (111) exports described infrared
The wave band of light covers medium-wave infrared and LONG WAVE INFRARED.
7. gas detection cell according to claim 1 or 2, which is characterized in that first reflector (112) and described
Second reflector (122) is that inner wall uses paraboloidal hollow tube-shape body.
8. a kind of infrared gas alarm using the described in any item gas detection cells of claim 1 to 7, feature exist
In, comprising: gas detection cell (1), the control unit (2) being electrically connected with the gas detection cell (1), and for supporting
The shell (3) of the gas detection cell (1) and described control unit (2)；
Described control unit (2) is fixed on the inside of the shell (3), and the gas detection cell (1) is fixedly supported upon institute
It states on the outside of shell (3).
9. infrared gas alarm according to claim 8, which is characterized in that the light in the gas detection cell (1)
Source (11) and the opposite outside for being arranged at intervals on the shell (3) of end of probe (12).
10. infrared gas alarm according to claim 9, which is characterized in that described control unit (2) includes: power supply
Conversion module (21), pulse mode conversion module (22), altogether amplification circuit module (23), signal processing module (24) and acousto-optic report
Alert module (25)；
The power conversion module (21) respectively with the pulse mode conversion module (22) and it is described altogether amplification circuit module
(23) it is electrically connected；
The pulse mode conversion module (22) is electrically connected with the source ends (11)；
Amplification circuit module (23) altogether are electrically connected with the end of probe (12), the end of probe (12) and the signal processing
Module (24) electrical connection, the signal processing module (24) and the sound and light alarm module (25) electrical connection.
11. infrared gas alarm according to claim 10, which is characterized in that the pulse mode conversion module (22)
It receives the DC signal of the power conversion module (21) output and is converted to the square wave electricity for the source ends (11) work
Signal, and the source ends (11) is driven to issue continuous square wave formula optical signal.
12. infrared gas alarm described in 0 or 11 according to claim 1, which is characterized in that described control unit (2) is also wrapped
It includes: for detecting the Temperature Humidity Sensor of temperature and humidity；
The Temperature Humidity Sensor is electrically connected to each other with the signal processing module (24).
13. infrared gas alarm according to claim 12, which is characterized in that further include: it is provided with pierced pattern
Protective cover (4)；
The side of the gas detection cell (1) is installed in protective cover (4) setting in the shell.
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| CN201910161246.XA CN109781651A (en) | 2019-03-04 | 2019-03-04 | A kind of gas detection cell and infrared gas alarm |
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