CN107884364A - Temperature and humidity compensation method when being detected available for laser methane - Google Patents
Temperature and humidity compensation method when being detected available for laser methane Download PDFInfo
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- CN107884364A CN107884364A CN201710982488.6A CN201710982488A CN107884364A CN 107884364 A CN107884364 A CN 107884364A CN 201710982488 A CN201710982488 A CN 201710982488A CN 107884364 A CN107884364 A CN 107884364A
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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
- G01N21/01—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
Abstract
The invention discloses temperature and humidity compensation method when being detected available for laser methane, step is carried out successively：The initial data under initial data and different humidity under multigroup different temperatures that the local sampling channel for needing to carry out laser methane detection measures, temperature data, humidity data to sampling channel carry out linear fit, draw matched curve；Sampling channel and reference channel are compensated according to matched curve to suppress null offset caused by temperature change.It is inaccurate that the present invention solves the problems, such as that laser methane detecting element existing for prior art is easily easily caused measurement by the influence of ambient temperature and humidity, temperature and humidity compensation method when can be used for laser methane detection is provided, it can suppress null offset caused by temperature change when applying, various concentrations measurement error caused by compensation temperature change, humidity compensation is carried out to reduce null offset and measurement of concetration error caused by ambient humidity change.
Description
Technical field
The present invention relates to laser methane detection, and in particular to temperature and humidity compensation method when being detected available for laser methane.
Background technology
The design principle of laser type methane transducer uses tunable laser spectroscopy absorption detecting method (TDLAS), uses
Distributed Feedback Laser drives Distributed Feedback Laser as light with the electric current of sinewave modulation signal one triangular signal of superposition.
The concentration of methane gas is detected using the method for tunable optical source+harmonic absorption.Harmonic detection is made an uproar in capable and experienced relate to
Small-signal is extracted in sound and improves one of most efficient method of detection sensitivity, its Cleaning Principle is sent when laser
When wavelength is near a certain absworption peak of methane gas, the wavelength control for being sent laser by temperature control regulation and current-modulation exists
At corresponding methane gas absworption peak, the modulated signal then added after sine wave and triangular wave superposition is carried out to optical maser wavelength
Modulation, the second harmonic signal caused by concentration of methane gas changes is detected by phase lock amplifying technology, so as to reach
To the purpose of concentration of methane gas detection.But when laser methane detects, laser methane detecting element is easily by environment temperature
The influence of humidity, so the accuracy that corresponding temperature and humidity compensation just can guarantee that methane concentration detection must be carried out to it, it is different
Environment temperature can to laser methane detecting element detect various concentrations methane gas have an impact, it must be mended accordingly
Repay and just can guarantee that its measurement accuracy, because steam has absorption at the characteristic absorption peak of methane, so ambient humidity
Change the measurement accuracy of laser methane detecting element can be had an impact, must be corresponding on influenceing to carry out caused by different humidity
Compensation.
The content of the invention
The present invention solves laser methane detecting element existing for prior art and easily held by the influence of ambient temperature and humidity
Easily cause the problem of measurement is inaccurate, there is provided temperature and humidity compensation method when detect available for laser methane, can be with during its application
Suppress temperature change caused by null offset, compensation temperature change caused by various concentrations measurement error, carry out humidity compensation with
Reduce null offset and measurement of concetration error caused by ambient humidity change.
The present invention is achieved through the following technical solutions：
Temperature and humidity compensation method when being detected available for laser methane, carries out step successively：
A：The local sampling channel for carrying out laser methane detection is being needed to carry out substantial amounts of temperature experiment and humidity experiment,
And the initial data under the initial data and different humidity under the multigroup different temperatures measured, carry out substantial amounts of temperature in reference channel
Degree experiment and humidity experiment, and the initial data under the initial data and different humidity under the multigroup different temperatures measured；
C：Linear fit is carried out to the temperature data of sampling channel and reference channel, humidity data, draws matched curve；
D：Sampling channel and reference channel are compensated according to matched curve and floated to suppress zero point caused by temperature change
Move；
E：The repeat step A in the methane content environment of the various concentrations of setting；
F：Multigroup temperature number of varying environment temperature sampling passage and reference channel when measuring different methane concentration detections
According to and humidity data；
G：Repeat step C；
H：Linear fit curve coefficients according to the matched curve of acquisition cause to two channel compensation temperature changes respectively
Various concentrations measurement error.
Further, temperature and humidity compensation method when being detected available for laser methane, obtain in the step A a large amount of different
During initial data at temperature and different humidity, multi-group data is measured in same temperature and same humidity, takes its average value to make
For the initial data at this temperature and this humidity.
Further, temperature and humidity compensation method when being detected available for laser methane, various concentrations are measured in the step F
Under multigroup temperature data and humidity data when, measure multi-group data under same concentration, take its average value as this concentration
Under sampled data.
The present invention compared with prior art, has the following advantages and advantages：
1st, the present invention tests the initial data measured come statistical analysis ambient temperature and humidity to laser first by a large amount of humitures
The affecting laws of alkane detecting element, so as to carry out targetedly temperature and humidity compensation to it.Pass through substantial amounts of temperature experimental data
Analysis obtains the influence curve of varying environment temperature during the detection of different methane concentrations to two passages of laser methane detecting element, and
According to the coefficient of linear fit curve respectively to various concentrations measurement error caused by two channel compensation temperature changes.By big
The humidity analysis of experimental data of amount obtains influence curve of the varying environment humidity to two passages of laser methane detecting element, according to
The coefficient of linear fit carries out humidity compensation to reduce null offset caused by ambient humidity change and dense to two passages respectively
Spend measurement error.
2nd, the present invention is in the initial data under obtaining a large amount of different temperatures and different humidity, in same temperature and same wet
Multi-group data is measured when spending, takes its average value to ask it flat as the initial data at this temperature and this humidity, repeatedly measurement
Average can strengthen the accuracy of data measured, strengthen the accuracy of temperature and humidity compensation of the present invention.
3rd, the present invention measures more in the multigroup temperature data and humidity data under measuring various concentrations under same concentration
Group data, taking its average value, repeatedly measurement, which is averaged, can strengthen data measured as the sampled data under this concentration
Accuracy, further enhance the accuracy of temperature and humidity compensation of the present invention.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is influence curve of the varying environment temperature of the present invention to sampling channel；
Fig. 2 is influence curve of the varying environment temperature of the present invention to reference channel；
Fig. 3 is influence curve of the varying environment temperature various concentrations methane to sampling channel；
Fig. 4 is influence curve of the varying environment temperature various concentrations methane to reference channel；
Fig. 5 is influence curve of the varying environment humidity to sampling channel；
Fig. 6 is influence curve of the varying environment humidity to reference channel.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment
As shown in figure 1, temperature and humidity compensation method when being detected available for laser methane, carries out step successively：
A：The local sampling channel for carrying out laser methane detection is being needed to carry out substantial amounts of temperature experiment and humidity experiment,
And the initial data under the initial data and different humidity under the multigroup different temperatures measured, carry out substantial amounts of temperature in reference channel
Degree experiment and humidity experiment, and the initial data under the initial data and different humidity under the multigroup different temperatures measured；Obtaining
When taking the initial data under a large amount of different temperatures and different humidity, multi-group data is measured in same temperature and same humidity, is taken
Its average value is as the initial data at this temperature and this humidity；
C：Linear fit is carried out to the temperature data of sampling channel and reference channel, humidity data, draws matched curve；
D：Sampling channel and reference channel are compensated according to matched curve and floated to suppress zero point caused by temperature change
Move；
E：The repeat step A in the methane content environment of the various concentrations of setting；
F：Multigroup temperature number of varying environment temperature sampling passage and reference channel when measuring different methane concentration detections
According to and humidity data, survey various concentrations under multigroup temperature data and humidity data when, measure multi-group data under same concentration,
Its average value is taken as the sampled data under this concentration；
G：Repeat step C；
H：Linear fit curve coefficients according to the matched curve of acquisition cause to two channel compensation temperature changes respectively
Various concentrations measurement error.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (3)
1. temperature and humidity compensation method during available for laser methane detection, it is characterised in that carry out step successively：
A：Needing the local sampling channel for carrying out laser methane detection to carry out substantial amounts of temperature experiment and humidity experiment, and surveying
The initial data under initial data and different humidity under the multigroup different temperatures obtained, it is real to carry out substantial amounts of temperature in reference channel
Test and tested with humidity, and the initial data under the initial data and different humidity under the multigroup different temperatures measured；
C：Linear fit is carried out to the temperature data of sampling channel and reference channel, humidity data, draws matched curve；
D：Sampling channel and reference channel are compensated according to matched curve to suppress null offset caused by temperature change；
E：The repeat step A in the methane content environment of the various concentrations of setting；
F：When measuring the detection of different methane concentrations multigroup temperature data of varying environment temperature sampling passage and reference channel and
Humidity data；
G：Repeat step C；
H：According to acquisition matched curve linear fit curve coefficients respectively to caused by two channel compensation temperature changes not
With measurement of concetration error.
2. the temperature and humidity compensation method during detection according to claim 1 available for laser methane, it is characterised in that described
When the initial data under a large amount of different temperatures and different humidity is obtained in step A, measured in same temperature and same humidity more
Group data, its average value is taken as the initial data at this temperature and this humidity.
3. the temperature and humidity compensation method during detection according to claim 1 available for laser methane, it is characterised in that described
When multigroup the temperature data and humidity data under various concentrations are measured in step F, multi-group data is measured under same concentration, takes it
Average value is as the sampled data under this concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710982488.6A CN107884364A (en) | 2017-10-20 | 2017-10-20 | Temperature and humidity compensation method when being detected available for laser methane |
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| CN201710982488.6A CN107884364A (en) | 2017-10-20 | 2017-10-20 | Temperature and humidity compensation method when being detected available for laser methane |
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| CN107884364A true CN107884364A (en) | 2018-04-06 |
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| CN201710982488.6A Withdrawn CN107884364A (en) | 2017-10-20 | 2017-10-20 | Temperature and humidity compensation method when being detected available for laser methane |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333318A (en) * | 2019-06-24 | 2019-10-15 | 北京卡达克数据有限公司 | A kind of humidity compensation method and system for in-car smell on-line detecting system |
| WO2020253175A1 (en) * | 2019-06-21 | 2020-12-24 | 珠海格力电器股份有限公司 | Formaldehyde concentration measurement method and apparatus, and air purifier |
| CN112326882A (en) * | 2020-10-22 | 2021-02-05 | 深圳市汇投智控科技有限公司 | Air quality sensor processing method and device |
-
2017
- 2017-10-20 CN CN201710982488.6A patent/CN107884364A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020253175A1 (en) * | 2019-06-21 | 2020-12-24 | 珠海格力电器股份有限公司 | Formaldehyde concentration measurement method and apparatus, and air purifier |
| CN110333318A (en) * | 2019-06-24 | 2019-10-15 | 北京卡达克数据有限公司 | A kind of humidity compensation method and system for in-car smell on-line detecting system |
| CN112326882A (en) * | 2020-10-22 | 2021-02-05 | 深圳市汇投智控科技有限公司 | Air quality sensor processing method and device |
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Application publication date: 20180406 |