CN110057778A - A kind of gas concentration detection apparatus and method - Google Patents
A kind of gas concentration detection apparatus and method Download PDFInfo
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- CN110057778A CN110057778A CN201910190374.7A CN201910190374A CN110057778A CN 110057778 A CN110057778 A CN 110057778A CN 201910190374 A CN201910190374 A CN 201910190374A CN 110057778 A CN110057778 A CN 110057778A
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- 238000001514 detection method Methods 0.000 title claims abstract description 33
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- 238000009795 derivation Methods 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 230000003321 amplification Effects 0.000 claims abstract description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 5
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 4
- 238000013500 data storage Methods 0.000 claims abstract description 4
- 108010076504 Protein Sorting Signals Proteins 0.000 claims description 24
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- 238000005516 engineering process Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 53
- 238000010586 diagram Methods 0.000 description 3
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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Abstract
The invention discloses a kind of gas concentration detection apparatus and methods, main control unit, light emitting unit, gas chamber unit, light receiving unit including circuiting sequentially connection；The main control unit includes controller, data storage and DA/AD converter；The light emitting unit includes the laser for the specific wavelength being adapted with detected gas absorption spectrum and the driving circuit of the laser；The gas chamber unit includes total reflection mirror and diffuse reflector；The light receiving unit includes the amplifying circuit of optical detector and the small voltage for exporting optical detector amplification.The present invention uses the average value of the multiple sawtooth voltage signals received and makees the second harmonic data obtained after digital filtering and secondary derivation, as the basic data for resolving gas concentration value, the slight wavelength fluctuation that laser can be overcome to be generated by external environment influence, and overcome the Light Difference of various lasers central wavelength as caused by production technology, guarantee precision and stability that gas concentration resolves.
Description
Technical field
The present invention relates to the technical field of gas concentration inspection more particularly to a kind of gas concentration detection apparatus and methods.
Background technique
In the essential industries such as petroleum, chemical industry, metallurgy field, gas concentration detection is production process control automation system
Important component；In mining, combustion gas and Gas Industry, gas concentration detects the leak detection for being widely used in pipeline；
With deepening continuously to environmental protective measure, air quality monitors the technology and dress that also widespread need gas concentration detects
It sets.
The realization of Gas Thickness Detecting Technology has the various ways such as biology, chemistry, optical detection, wherein spectrum analysis field
Tunable diode laser absorption spectroscopy (TDLAS) technology, using semiconductor laser with tunable narrow linewidth and wavelength with
The characteristic that Injection Current changes, realization measure the single or several of molecule apart from close very indistinguishable Absorption Line.It should
Technology is applied to the characteristic that gas concentration detection has response rate height, high sensitivity, real-time good, is current widely applied one
Kind technology.
It is currently based on the gas concentration detection apparatus of TDLAS technology, to the consistency and stability requirement of laser wavelength
Height, the extraneous factors such as environment temperature, air pressure are affected to accuracy in detection and precision, while in mine, underpass etc.
It is difficult with the place of mains-supplied, detection device can only be powered using battery, and reducing power consumption also becomes the technology for needing to solve
Problem.
Summary of the invention
In view of this, can overcome the main purpose of the present invention is to provide a kind of gas concentration detection apparatus and method
The variation of the extraneous factors such as laser wavelength unstability and environment temperature, air pressure is influenced caused by accuracy in detection and precision,
And can be run on low-power consumption mode can only use battery powered use condition.
In order to achieve the above objectives, the present invention provides a kind of gas concentration detection apparatus, the master including circuiting sequentially connection
Control unit, light emitting unit, gas chamber unit, light receiving unit；
The main control unit includes controller, data storage and DA/AD converter；
The light emitting unit includes the laser for the specific wavelength being adapted with detected gas absorption spectrum and is somebody's turn to do
The driving circuit of laser；
The gas chamber unit includes total reflection mirror and diffuse reflector；
The light receiving unit includes the amplification electricity of optical detector and the small voltage for exporting optical detector amplification
Road.
It as an improvement of the above technical solution, in one embodiment of the invention, further include connecting with the main control unit
The temperature and air pressure detecting unit connect, for providing temperature and pressure information to the main control unit.
Optionally, delay a period of time after the controller powers on, to the laser works, stable, tested gas is equal
It is even to be distributed in gas chamber unit and then the driving laser works and resolve gas concentration.
Optionally, the main control unit passes through the light emitting unit with intermittent duty by sawtooth signal sequence
The driving circuit of laser be applied to the laser of light emitting unit.
Further, controller is entered sleep mould after emitting a sawtooth signal sequence by the main control unit
Formula is simultaneously kept for a period of time, is again introduced into normal mode later and is emitted sawtooth signal sequence next time.
By upper, the power consumption under battery condition of power supply can be effectively reduced.
Preferably, the sawtooth signal sequence is made of preceding M short cycle sawtooth wave and rear N number of long period sawtooth wave；
The preceding M short cycle sawtooth wave stablizes the laser status of service intermittent for preheating laser；
N number of long period sawtooth signal voltage generates electric current after the conversion of the driving circuit of the laser after described, covers
The gamut of lid laser running current generates the starting point of electric current since the threshold current of laser, centainly to walk
The long Near The Upper Limit for being gradually increased to laser running current.
Optionally, the main control unit receives the light receiving unit after emitting a sawtooth signal sequence
M short cycle sawtooth voltage signal abandon, using the average value of rear N number of long period sawtooth voltage signal, using sliding
The average method of window does digital filtering, and second harmonic is taken out in secondary derivation to data later again, as resolving gas concentration value
Basic data.
Further, the gas chamber unit further includes the emergent light and the optical detector for that will guarantee the laser
Mechanical structured member of the incident light in same level and same vertical direction；
The emergent light of the laser is incident on the total reflection mirror with 45 degree of angles, and the emergent light of the total reflection mirror is with 45
It is incident on the diffuse reflector in degree angle.
By upper, enabling laser and the optical detector compactly placement-and-routing on PCB, whole the space occupied is smaller,
So as to realize the gas detection apparatus of miniaturization.
The present invention also provides a kind of gas concentration detection methods, comprising the following steps:
S10, main control unit controller power on after delay a period of time, the laser works to light emitting unit are steady
Fixed, tested gas is uniformly distributed in gas chamber unit and then the driving laser works and resolves gas concentration；
S20, main control unit, by sawtooth signal sequence, pass through the drive of the laser of light emitting unit with intermittent duty
Dynamic circuit is applied to the laser of light emitting unit；
Controller is entered sleep pattern and keeps one by S30, main control unit after emitting a sawtooth signal sequence
The section time is again introduced into normal mode later and emits sawtooth signal sequence next time；
S40, M short cycle sawtooth voltage signal for receiving light receiving unit abandon, and use rear N number of long period sawtooth
The average value of wave voltage signal does digital filtering using the average method of sliding window, and data later again take out by secondary derivation
Second harmonic, as the basic data for resolving gas concentration value.
By upper, using the multiple sawtooth voltage signals received average value and make after digital filtering and secondary derivation
The second harmonic data arrived can overcome laser to be produced by external environment influence as the basic data for resolving gas concentration value
Raw slight wavelength fluctuation, and overcome the Light Difference of various lasers central wavelength as caused by production technology, guarantee
The precision and stability that gas concentration resolves.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, the attached drawing to embodiment is simply situated between below
It continues.
Fig. 1 is the functional block diagram of gas concentration detection apparatus of the invention；
Fig. 2 is the sawtooth wave sequence diagram that main control unit of the invention generates；
Fig. 3 is the structural schematic diagram of gas chamber unit of the invention.
Specific embodiment
The embodiment of the invention will now be described in detail with reference to the accompanying drawings, and as part of this specification passes through
Embodiment illustrates the principle of the present invention, and other aspects of the present invention, feature and its advantage will become by the detailed description
It is very clear.In the attached drawing of institute's reference, the same or similar component is indicated using identical drawing reference numeral in different figures.
As shown in Figure 1-3, the present invention provides a kind of gas concentration detection apparatus, including sequentially connected main control unit
10, light emitting unit 20, gas chamber unit 30, light receiving unit 40 reconnect back main control unit 10, form closed loop.
The gas concentration detection apparatus further includes the temperature and air pressure detecting unit 50 for being connected to main control unit 10, is used for
Temperature and pressure information are provided to main control unit.
Wherein, the main control unit 10 includes that the peripheries such as controller (CPU), data storage and DA/AD converter are set
It is standby；The light emitting unit 20 includes the laser 21 for the specific wavelength being adapted with detected gas absorption spectrum, and should
The driving circuit of laser；The gas chamber unit 30 includes total reflection mirror 31, diffuse reflector 32 and the fixed total reflection mirror 31
With the mechanical structured member of diffuse reflector 32；The light receiving unit 40 include optical detector 41, and by optical detector output it is micro-
The amplifying circuit of small voltage amplification.
Controller (CPU) in main control unit of the invention postpones a period of time after power-up, steady to laser works
Fixed, tested gas is uniformly distributed in gas chamber unit and then driving laser works and resolves gas concentration, to guarantee that device exists
The operation is stable after powering on, and resolve the accuracy of concentration data.Main control unit 10 is with intermittent duty by sawtooth signal
Sequence is applied to the laser 21 of light emitting unit 20 by the laser driving circuit of light emitting unit 20.Main control unit 10
After emitting a sawtooth signal sequence, controller (CPU) is entered into sleep pattern and is kept for a period of time, later again
Into normal mode and emits sawtooth signal sequence next time and make its role is to reduce the power consumption under battery condition of power supply
This gas concentration detection apparatus can be suitable for the occasion of the unsuitable alternating current work such as mine, sewer pipe.
As shown in Fig. 2, sawtooth signal sequence of the invention is by preceding M short cycle sawtooth wave and rear N number of long period sawtooth
Wave is constituted, and preceding M short cycle sawtooth wave stablizes the laser status of service intermittent, rear N number of long week for preheating laser
Phase sawtooth signal voltage generates electric current after laser driving circuit is converted, and can cover the complete of laser running current
Range generates the starting point of electric current since the threshold current of laser, is gradually increased to the normal work of laser with a fixed step size
The Near The Upper Limit for making electric current plays the role of finely tuning laser center wavelength, so that laser be overcome to be produced by external environment influence
Raw slight wavelength fluctuation, and overcome the Light Difference of various lasers central wavelength as caused by production technology, guarantee
Certain absorption peak for generating tested gas.
As shown in figure 3, the mechanical structured member of gas chamber unit of the invention meets the emergent light and optical detector of laser 21
41 incident light is in same level and same vertical direction, and wherein laser emitting light is incident on total reflection mirror with 45 degree of angles
31, the emergent light of total reflection mirror 31 is incident on diffuse reflector 32 with 45 degree of angles, to enable laser 21 and optical detector 41
The compactly placement-and-routing on PCB, while the occupied space of gas chamber is smaller, so as to realize the detection of gas dress of miniaturization
It sets.
In addition, the M that after emitting a sawtooth signal sequence, light receiving unit 40 is received for main control unit 10 is a short
Period sawtooth voltage signal abandons, average using sliding window using the average value of rear N number of long period sawtooth voltage signal
The methods of do digital filtering, second harmonic is taken out in secondary derivation to data later again, as the basic number for resolving gas concentration value
According to, and the information provided according to temperature and air pressure detecting unit, implement the temperature and atmospheric pressure compensating that concentration resolves, guarantees that gas is dense
Spend the precision and stability resolved.
Correspondingly, the present invention also provides a kind of gas concentration detection methods, comprising the following steps:
S10, main control unit 10 controller power on after delay a period of time, 21 work of laser to light emitting unit 20
Make stable, tested gas to be uniformly distributed in gas chamber unit and then the driving work of laser 21 and resolve gas concentration；
S20, main control unit 10, by sawtooth signal sequence, pass through the laser of light emitting unit 20 with intermittent duty
Driving circuit be applied to the laser of light emitting unit；
Controller is entered sleep pattern and kept by S30, main control unit 10 after emitting a sawtooth signal sequence
For a period of time, it is again introduced into normal mode later and emits sawtooth signal sequence next time；
S40, M short cycle sawtooth voltage signal for receiving light receiving unit 40 abandon, and are sawed using rear N number of long period
The average value of tooth wave voltage signal does digital filtering using the average method of sliding window, and secondary derivation takes data later again
Second harmonic out, as the basic data for resolving gas concentration value.
After the present invention uses the average value of the multiple sawtooth voltage signals received and makees digital filtering and secondary derivation
Obtained second harmonic data can overcome laser by external environment influence as the basic data for resolving gas concentration value
The slight wavelength fluctuation generated, and overcome the Light Difference of various lasers central wavelength as caused by production technology, it protects
Demonstrate,prove precision and stability that gas concentration resolves.Main control unit uses service intermittent mode, can be effectively reduced battery power supply
Under the conditions of power consumption, so that the present apparatus is suitable for the occasion of the unsuitable alternating current work such as mine, sewer pipe.Gas of the invention
The Design of Mechanical Structure of chamber unit enables laser and the optical detector compactly placement-and-routing on PCB, the sky integrally occupied
Between it is smaller, so as to realize the gas detection apparatus of miniaturization.
The above is a preferred embodiment of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, it is noted that for those skilled in the art, without departing from the principle of the present invention, may be used also
To make several improvement and variation, these, which improve and change, is also considered as protection scope of the present invention.
Claims (9)
1. a kind of gas concentration detection apparatus, which is characterized in that including circuit sequentially the main control unit of connection, light emitting unit,
Gas chamber unit, light receiving unit；
The main control unit includes controller, data storage and DA/AD converter；
The light emitting unit includes the laser and the laser for the specific wavelength being adapted with detected gas absorption spectrum
The driving circuit of device；
The gas chamber unit includes total reflection mirror and diffuse reflector；
The light receiving unit includes the amplifying circuit of optical detector and the small voltage for exporting optical detector amplification.
2. gas concentration detection apparatus as described in claim 1, which is characterized in that further include being connect with the main control unit
Temperature and air pressure detecting unit, for providing temperature and pressure information to the main control unit.
3. gas concentration detection apparatus as described in claim 1, which is characterized in that one section of delay after the controller powers on
Time, to the laser works, stable, tested gas is uniformly distributed in gas chamber unit and then the driving laser works
With resolving gas concentration.
4. gas concentration detection apparatus as described in claim 1, which is characterized in that the main control unit is with intermittent duty
By sawtooth signal sequence, the laser of light emitting unit is applied to by the driving circuit of the laser of the light emitting unit
Device.
5. gas concentration detection apparatus as claimed in claim 4, which is characterized in that the main control unit is emitting a sawtooth
After wave signal sequence, controller is entered into sleep pattern and is kept for a period of time, normal mode is again introduced into later and emits
Sawtooth signal sequence next time.
6. gas concentration detection apparatus as claimed in claim 5, which is characterized in that the sawtooth signal sequence is by preceding M
Short cycle sawtooth wave and rear N number of long period sawtooth wave are constituted；
The preceding M short cycle sawtooth wave stablizes the laser status of service intermittent for preheating laser；
N number of long period sawtooth signal voltage generates electric current after the conversion of the driving circuit of the laser after described, and covering swashs
The gamut of light device running current, generate electric current starting point since the threshold current of laser, with a fixed step size by
The cumulative Near The Upper Limit for adding to laser running current.
7. gas concentration detection apparatus as claimed in claim 5, which is characterized in that the main control unit is emitting a sawtooth
After wave signal sequence, the M short cycle sawtooth voltage signal that the light receiving unit is received is abandoned, and uses rear N number of length
The average value of period sawtooth voltage signal does digital filtering using the average method of sliding window, and data later are secondary again
Second harmonic is taken out in derivation, as the basic data for resolving gas concentration value.
8. gas concentration detection apparatus as described in claim 1, which is characterized in that the gas chamber unit further includes for that will protect
Machinery of the incident light of the emergent light and the optical detector of demonstrate,proving the laser in same level and same vertical direction
Structural member；
The emergent light of the laser is incident on the total reflection mirror with 45 degree of angles, and the emergent light of the total reflection mirror is with 45 degree of angles
It is incident on the diffuse reflector.
9. a kind of gas concentration detection method using such as gas concentration detection apparatus of any of claims 1-8,
Characterized by comprising the following steps:
S10, main control unit controller power on after delay a period of time, laser works to light emitting unit are stable, quilt
Gas is surveyed to be uniformly distributed in gas chamber unit and then the driving laser works and resolve gas concentration；
S20, main control unit, by sawtooth signal sequence, pass through the driving electricity of the laser of light emitting unit with intermittent duty
Road is applied to the laser of light emitting unit；
S30, main control unit are after emitting a sawtooth signal sequence, when entering sleep pattern by controller and kept for one section
Between, it is again introduced into normal mode later and emits sawtooth signal sequence next time；
S40, M short cycle sawtooth voltage signal for receiving light receiving unit abandon, and use rear N number of long period sawtooth wave electricity
The average value for pressing signal, does digital filtering using the average method of sliding window, and secondary derivation taking-up is secondary again for data later
Harmonic wave, as the basic data for resolving gas concentration value.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110443216A (en) * | 2019-08-13 | 2019-11-12 | 树根互联技术有限公司 | A kind of production model recognition methods of production equipment and device |
| CN110987869A (en) * | 2019-12-12 | 2020-04-10 | 华中科技大学 | Integrated optical fiber gas detection system and method |
| CN112924399A (en) * | 2019-12-05 | 2021-06-08 | 比亚迪半导体股份有限公司 | Gas concentration detection device and detection method |
| CN114280004A (en) * | 2021-12-14 | 2022-04-05 | 武汉信达易通科技有限公司 | Gas detection device for increasing optical path and inhibiting reflection interference |
| CN116955940A (en) * | 2023-09-21 | 2023-10-27 | 宏朗环保科技(北京)有限公司 | Harmful gas concentration monitoring data optimization processing method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110443216A (en) * | 2019-08-13 | 2019-11-12 | 树根互联技术有限公司 | A kind of production model recognition methods of production equipment and device |
| CN112924399A (en) * | 2019-12-05 | 2021-06-08 | 比亚迪半导体股份有限公司 | Gas concentration detection device and detection method |
| CN110987869A (en) * | 2019-12-12 | 2020-04-10 | 华中科技大学 | Integrated optical fiber gas detection system and method |
| CN114280004A (en) * | 2021-12-14 | 2022-04-05 | 武汉信达易通科技有限公司 | Gas detection device for increasing optical path and inhibiting reflection interference |
| CN116955940A (en) * | 2023-09-21 | 2023-10-27 | 宏朗环保科技(北京)有限公司 | Harmful gas concentration monitoring data optimization processing method |
| CN116955940B (en) * | 2023-09-21 | 2023-11-21 | 宏朗环保科技(北京)有限公司 | Harmful gas concentration monitoring data optimization processing method |
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