CN107132203A - Gas degree of purity detection method, system and device - Google Patents
Gas degree of purity detection method, system and device Download PDFInfo
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- CN107132203A CN107132203A CN201710308259.6A CN201710308259A CN107132203A CN 107132203 A CN107132203 A CN 107132203A CN 201710308259 A CN201710308259 A CN 201710308259A CN 107132203 A CN107132203 A CN 107132203A
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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
- G01N21/55—Specular reflectivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/4802—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
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Abstract
The invention provides a kind of gas degree of purity detection method, system and device, methods described includes：According to default Laser emission sequential to atmospheric emission detection laser beam；Obtain the pure background light signal for being not incorporated into detection laser beam and echo；The echo-signal for the detection laser beam that band is made an uproar is received, wherein the echo-signal for the detection laser beam that the band is made an uproar includes the echo optical signal and background light signal of the detection laser beam；The background light signal in the detection laser beam that the band is made an uproar is removed by pure background light signal.A kind of gas degree of purity detection method, system and device are described method provided, can be for a long time to gas, such as air is detected, and the testing result obtained can be with the interference noise of wiping out background light, to ensure the accuracy of testing result.
Description
Technical field
The present invention relates to field of measuring technique, a kind of gas degree of purity detection method, system and device are particularly related to.
Background technology
The very important index when detection of gas degree of purity is gas detection.By taking atmosphere pollution field as an example, air
Included in impurity how much directly reflect atmospheric pollution level.Because atmosphere pollution is increasingly serious, people also increasingly note
The detection of atmosphere pollution again.The main source of present atmosphere pollution is aerosol, and aerosol refers to that diameter exists in air
0.001-100 μm of liquid or solid microparticle system.Wherein the formation of aerosol includes natural source and artificial source：Natural source master
Including：The troposphere aerosol of the formation such as dust from land surface, sandstorm, forest fires cigarette ash, pollen and seed；Artificial source mainly wraps
Include：The particulate that industry, traffic, agricultural, building etc. are directly discharged into troposphere.Atmosphere pollution prison of the prior art
Measurement equipment generally includes particulate matter sensors detection and laser radar detects two kinds：
Particulate matter sensors detection is the atmospheric samples by extraction, is examined by the particulate matter sensors in equipment
Survey；Most common is exactly existing PM2.5 detectors.
Laser radar is a kind of advanced active remote sensing instrument, be can be achieved to large-scale constituent of atomsphere and environment parameter
(such as temperature, humidity) carries out continuous, the real-time, monitoring of high-spatial and temporal resolution.Its basic functional principle be using laser to
Object launches laser beam, then receives the echo optical signal that (or reflection) returns is scattered by object, and then turns after light splitting
Change electric echo signal into and carry out analysis identification.But in actual applications, laser radar echo signal is propagated to decline with square distance
Subtract, signal is very faint.In addition, noise and interference source, including photodetection are inevitably present in laser radar system
Electrical noise, thermal noise, supply harmonic interference in system etc..Atmospheric aerosol detection needs round-the-clock progress, but daytime is even
The sky background light and terrestrial surface radiation light at night can pollute or even flood effective echo-signal of laser radar, limit laser radar
Effective detection range and the degree of accuracy.
The content of the invention
Quick, accurate, the real-time gas of laser radar progress is utilized the technical problem to be solved in the present invention is to provide a kind of
Gas degree of purity detection method, system and the device of detection.
In order to achieve the above object, the embodiment of the present invention proposes a kind of gas degree of purity detection method, including：
According to default Laser emission sequential to atmospheric emission detection laser beam；Obtain and be not incorporated into detection laser beam and echo
Pure background light signal；
The echo-signal for the detection laser beam that band is made an uproar is received, wherein the echo-signal for the detection laser beam that the band is made an uproar includes
The echo optical signal and background light signal of the detection laser beam；
The background light signal in the detection laser beam that the band is made an uproar is removed by pure background light signal.
Wherein, the background light signal removed by pure background light signal in the detection laser beam that the band is made an uproar, tool
Body includes：
Pure background light signal b (t) is carried out transform domain to be characterized as B (ω)；The laser radar echo signal x that band is made an uproar
(t) transform domain is carried out to be characterized as X (ω)；
Pure background light signal removes the echo-signal obtained after the background light signal in the detection laser beam that the band is made an uproar
Transform domain characterize；
The laser radar echo signal transform domain X (ω) made an uproar using the transform domain F (ω) and band of echo-signal, calculates enhancing
Echo-signal transform domain
X ' (ω)=X (ω) × F (ω)
The transform domain X ' (ω) of enhanced echo-signal is carried out inverse transformation to obtain enhanced echo time-domain signal x '
(t)。
Wherein, the transform domain and inverse transformation use following at least one method：Fourier transform, discrete cosine become
Change, Laplace transform, wavelet transformation.
Meanwhile, the embodiment of the present invention also proposed a kind of gas degree of purity detection means, including：
Trigger mechanism, for according to default Laser emission sequential to atmospheric emission detection laser beam；
Receiving mechanism, the pure background light signal of detection laser beam and echo is not incorporated into for obtaining；It is additionally operable to receive band
The echo-signal for the detection laser beam made an uproar, wherein the echo-signal for the detection laser beam that the band is made an uproar includes the detection laser beam
Echo optical signal and background light signal；
Mechanism is filtered out, for the pure background light signal received according to receiving mechanism, the detection that the removal band is made an uproar swashs
Background light signal in light beam.
Wherein, the mechanism that filters out performs following operate：
Pure background light signal b (t) is carried out transform domain to be characterized as B (ω)；The laser radar echo signal x that band is made an uproar
(t) transform domain is carried out to be characterized as X (ω)；
Pure background light signal removes the echo-signal obtained after the background light signal in the detection laser beam that the band is made an uproar
Transform domain characterize；
The laser radar echo signal transform domain X (ω) made an uproar using the transform domain F (ω) and band of echo-signal, calculates enhancing
Echo-signal transform domain
X ' (ω)=X (ω) × F (ω)
The transform domain X ' (ω) of enhanced echo-signal is carried out inverse transformation to obtain enhanced echo time-domain signal x '
(t)。
Wherein, the transform domain and inverse transformation use following at least one method：Fourier transform, discrete cosine become
Change, Laplace transform, wavelet transformation.
Meanwhile, the embodiment of the present invention also proposed a kind of gas degree of purity detecting system, including as described in preceding any one
Gas degree of purity detection means, in addition to master control set, the master control set connect the gas degree of purity detection means to control
The trigger mechanism for making the gas degree of purity detection means launches the detection laser beam, and mechanism acquisition is filtered out described in reception
Enhanced echo time-domain signal x ' (t).
The above-mentioned technical proposal of the present invention has the beneficial effect that：Described method provide a kind of gas degree of purity detection side
Method, system and device, can be detected to gas (such as air) for a long time, and the testing result obtained can be with wiping out background
The interference noise of light, to ensure the accuracy of testing result.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the embodiment of the present invention.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body example is described in detail.
The present invention general principle be：The detection laser beam of transmitting can form band and make an uproar after atmospheric emission, refraction
It can include actually useful detection laser beam in the echo-signal of detection laser beam, and the echo-signal of detection laser beam made an uproar of band
Echo optical signal, but also can include as noise background light signal.Above-mentioned principle, Ke Yiti are utilized in the embodiment of the present invention
Take acquisition to be not incorporated into the pure background light signal of detection laser beam and echo, the echo for the detection laser beam that band is made an uproar then is obtained again
Signal；Then the background light signal in the detection laser beam that the band is made an uproar is removed by pure background light signal.Thus can be with
Obtain wherein enhanced echo optical signal.
In order to achieve the above object, the embodiment of the present invention proposes a kind of gas degree of purity detection method, including：
According to default Laser emission sequential to atmospheric emission detection laser beam；Obtain and be not incorporated into detection laser beam and echo
Pure background light signal；
The echo-signal for the detection laser beam that band is made an uproar is received, wherein the echo-signal for the detection laser beam that the band is made an uproar includes
The echo optical signal and background light signal of the detection laser beam；
The background light signal in the detection laser beam that the band is made an uproar is removed by pure background light signal.
Wherein, the background light signal removed by pure background light signal in the detection laser beam that the band is made an uproar, tool
Body includes：
Pure background light signal b (t) is carried out transform domain to be characterized as B (ω)；The laser radar echo signal x that band is made an uproar
(t) transform domain is carried out to be characterized as X (ω)；
Pure background light signal removes the echo-signal obtained after the background light signal in the detection laser beam that the band is made an uproar
Transform domain characterize；
The laser radar echo signal transform domain X (ω) made an uproar using the transform domain F (ω) and band of echo-signal, calculates enhancing
Echo-signal transform domain
X ' (ω)=X (ω) × F (ω)
The transform domain X ' (ω) of enhanced echo-signal is carried out inverse transformation to obtain enhanced echo time-domain signal x '
(t)。
Wherein, the transform domain and inverse transformation use following at least one method：Fourier transform, discrete cosine become
Change, Laplace transform, wavelet transformation.
Meanwhile, the embodiment of the present invention also proposed a kind of gas degree of purity detection means, including：
Trigger mechanism, for according to default Laser emission sequential to atmospheric emission detection laser beam；
Receiving mechanism, the pure background light signal of detection laser beam and echo is not incorporated into for obtaining；It is additionally operable to receive band
The echo-signal for the detection laser beam made an uproar, wherein the echo-signal for the detection laser beam that the band is made an uproar includes the detection laser beam
Echo optical signal and background light signal；
Mechanism is filtered out, for the pure background light signal received according to receiving mechanism, the detection that the removal band is made an uproar swashs
Background light signal in light beam.
Wherein, the mechanism that filters out performs following operate：
Pure background light signal b (t) is carried out transform domain to be characterized as B (ω)；The laser radar echo signal x that band is made an uproar
(t) transform domain is carried out to be characterized as X (ω)；
Pure background light signal removes the echo-signal obtained after the background light signal in the detection laser beam that the band is made an uproar
Transform domain characterize；
The laser radar echo signal transform domain X (ω) made an uproar using the transform domain F (ω) and band of echo-signal, calculates enhancing
Echo-signal transform domain
X ' (ω)=X (ω) × F (ω)
The transform domain X ' (ω) of enhanced echo-signal is carried out inverse transformation to obtain enhanced echo time-domain signal x '
(t)。
Wherein, the transform domain and inverse transformation use following at least one method：Fourier transform, discrete cosine become
Change, Laplace transform, wavelet transformation.
Meanwhile, the embodiment of the present invention also proposed a kind of gas degree of purity detecting system, including as described in preceding any one
Gas degree of purity detection means, in addition to master control set, the master control set connect the gas degree of purity detection means to control
The trigger mechanism for making the gas degree of purity detection means launches the detection laser beam, and mechanism acquisition is filtered out described in reception
Enhanced echo time-domain signal x ' (t).
The environmental contaminants monitoring provided in an embodiment of the present invention based on laser radar in a specific embodiment
Data interaction flow etc. between system, including control Laser emission sequential, the calculating of atmospheric pollution level, each unit；
The transmitter unit, for receiving central processing unit firing order, laser beam is specified in transmitting；
The receiving unit, is changed for receiving echo optical signal and background light signal, and by received optical signal
For electric echo signal；
The signal processing unit, does corresponding signal transacting to the echo optical signal and background light signal received, disappears
Except noise signal lifts the quality of echo-signal；
Specifically, obtaining background light signal from receiving unit, going out transform domain by signal transformation calculations characterizes；It is single from receiving
Member obtains the laser radar echo signal that band is made an uproar, and is characterized by signal transformation calculations transform domain；Echo is obtained using de-noising filtering
The transform domain of signal is characterized；Enhanced echo time-domain signal is recovered using inverse transformation.
The display unit, for CPU to be calculated into obtained atmosphere pollution procedure result, by image or
The form of word is presented to terminal user；
As shown in figure 1, being the flow of the environmental contaminants monitoring method provided in an embodiment of the present invention based on laser radar
Schematic diagram, including：
Background light signal is obtained from receiving unit, going out transform domain by signal transformation calculations characterizes；
Specifically, background light signal is expressed as b (t), and its transform domain is characterized as B (ω), and transform method can be Fourier
One kind of conversion, discrete cosine transform, Laplace transform, wavelet transformation etc. or combination；
The laser radar echo signal that band is made an uproar is obtained from receiving unit, is characterized by signal transformation calculations transform domain；
Specifically, the laser radar echo signal that band is made an uproar is expressed as x (t), and its transform domain is characterized as X (ω)；
The transform domain sign for obtaining echo-signal is filtered using de-noising；
Specifically, the transform domain of de-noising wave filter is characterized as
The transform domain of enhanced echo-signal is characterized as
X ' (ω)=X (ω) × F (ω)
Enhanced echo time-domain signal is recovered using inverse transformation, specifically, when contravariant swaps out enhanced from X ' (ω)
Domain signal x ' (t).
For device embodiment, because it corresponds essentially to embodiment of the method, so related part is real referring to method
Apply the part explanation of example.Device embodiment described above is only schematical, wherein described be used as separating component
The unit of explanation can be or may not be physically separate, and the part shown as unit can be or can also
It is not physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Can be according to reality
Selection some or all of module therein is needed to realize the purpose of application scheme.Those of ordinary skill in the art are not paying
In the case of going out creative work, you can to understand and implement.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of gas degree of purity detection method, it is characterised in that including：
According to default Laser emission sequential to atmospheric emission detection laser beam；Obtain and be not incorporated into the pure of detection laser beam and echo
Background light signal；
The echo-signal for the detection laser beam that band is made an uproar is received, wherein the echo-signal for the detection laser beam that the band is made an uproar is including described
The echo optical signal and background light signal of detection laser beam；
The background light signal in the detection laser beam that the band is made an uproar is removed by pure background light signal.
2. gas degree of purity detection method according to claim 1, it is characterised in that including：
The background light signal removed by pure background light signal in the detection laser beam that the band is made an uproar, is specifically included：
Pure background light signal b (t) is carried out transform domain to be characterized as B (ω)；The laser radar echo signal x (t) that band is made an uproar
Transform domain is carried out to be characterized as X (ω)；
Pure background light signal removes the change of the echo-signal obtained after the background light signal in the detection laser beam that the band is made an uproar
Change domain sign；
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The laser radar echo signal transform domain X (ω) made an uproar using the transform domain F (ω) and band of echo-signal, is calculated enhanced time
The transform domain of ripple signal
X ' (ω)=X (ω) × F (ω)
The transform domain X ' (ω) of enhanced echo-signal is carried out inverse transformation to obtain enhanced echo time-domain signal x ' (t).
3. gas degree of purity detection method according to claim 1 or 2, it is characterised in that the transform domain and inverse transformation
Using following at least one method：Fourier transform, discrete cosine transform, Laplace transform, wavelet transformation.
4. a kind of gas degree of purity detection means, it is characterised in that including：
Trigger mechanism, for according to default Laser emission sequential to atmospheric emission detection laser beam；
Receiving mechanism, the pure background light signal of detection laser beam and echo is not incorporated into for obtaining；It is additionally operable to receive what band was made an uproar
The echo-signal of detection laser beam, wherein the echo-signal for the detection laser beam that the band is made an uproar includes returning for the detection laser beam
Wave optical signal and background light signal；
Mechanism is filtered out, for the pure background light signal received according to receiving mechanism, the detection laser beam that the band is made an uproar is removed
In background light signal.
5. gas degree of purity detection means according to claim 4, it is characterised in that the mechanism that filters out performs following grasp
Make：
Pure background light signal b (t) is carried out transform domain to be characterized as B (ω)；The laser radar echo signal x (t) that band is made an uproar
Transform domain is carried out to be characterized as X (ω)；
Pure background light signal removes the change of the echo-signal obtained after the background light signal in the detection laser beam that the band is made an uproar
Change domain sign；
<mrow>
<mi>F</mi>
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<mo>(</mo>
<mi>&omega;</mi>
<mo>)</mo>
</mrow>
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<mi>&omega;</mi>
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<mi>&omega;</mi>
<mo>)</mo>
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The laser radar echo signal transform domain X (ω) made an uproar using the transform domain F (ω) and band of echo-signal, is calculated enhanced time
The transform domain of ripple signal
X ' (ω)=X (ω) × F (ω)
The transform domain X ' (ω) of enhanced echo-signal is carried out inverse transformation to obtain enhanced echo time-domain signal x ' (t).
6. the gas degree of purity detection means according to claim 4 or 5, it is characterised in that the transform domain and inverse transformation
Using following at least one method：Fourier transform, discrete cosine transform, Laplace transform, wavelet transformation.
7. a kind of gas degree of purity detecting system, it is characterised in that pure including the gas as described in claim any one of 4-6
Detection means, in addition to master control set are spent, the master control set connects the gas degree of purity detection means to control the gas
The trigger mechanism of body degree of purity detection means launches the detection laser beam, and is filtered out described in reception enhanced time of mechanism acquisition
Ripple time-domain signal x ' (t).
Priority Applications (1)
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| CN201710308259.6A CN107132203A (en) | 2017-05-04 | 2017-05-04 | Gas degree of purity detection method, system and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710308259.6A CN107132203A (en) | 2017-05-04 | 2017-05-04 | Gas degree of purity detection method, system and device |
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Family
ID=59715252
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| CN201710308259.6A Pending CN107132203A (en) | 2017-05-04 | 2017-05-04 | Gas degree of purity detection method, system and device |
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Cited By (1)
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| CN112965404A (en) * | 2021-01-18 | 2021-06-15 | 林寿福 | Fish protein suspension functional liquid fertilizer production device, control system, method and terminal |
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