CN102608063A - Measurement method for CO gas of three-channel infrared gas sensor - Google Patents
Measurement method for CO gas of three-channel infrared gas sensor Download PDFInfo
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- CN102608063A CN102608063A CN2012101023529A CN201210102352A CN102608063A CN 102608063 A CN102608063 A CN 102608063A CN 2012101023529 A CN2012101023529 A CN 2012101023529A CN 201210102352 A CN201210102352 A CN 201210102352A CN 102608063 A CN102608063 A CN 102608063A
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Abstract
The invention provides a measurement method for the CO gas of a three-channel infrared gas sensor. The measurement method comprises the following steps of: charging CO2 gases with different concentrations in a measurement gas chamber respectively, so as to establish a CO2 gas concentration query table; charging CO gases with different concentrations in the measurement gas chamber respectively, so as to establish a CO gas concentration query table; and charging a to-be-measured CO gas in the measurement gas chamber, and performing a gas concentration measurement. In the method disclosed by the invention, a corresponding relationship exists between a gas transmittance and a gas concentration, and the CO2 gas concentration query table and the CO gas concentration query table are established via a relationship between the ratio of the output signal of an infrared detection and the gas concentration, thus eliminating the influence on the measured concentration of the CO gas caused by CO2 contained in CO, and improving the accuracy of concentration measurement for the CO gas. Moreover, the method further can measure the concentration of the contained CO2 gas, and is especially suitable for concentration measurement for a low-concentration CO gas.
Description
Technical field
The present invention relates to a kind of measuring method of infrared gas sensor, specifically, related to a kind of CO gas measuring method of triple channel infrared gas sensor.
Background technology
As everyone knows; CO is the toxic gas of colorless and odorless; In industries such as chemical plant, mine, smelting iron and steel; Tend to produce a large amount of CO, and also contain a large amount of CO in the used natural gas of daily life, therefore detect CO safeguarding industrial safety production, prevention and poison and ensureing that life security has very significant meaning.In traditional CO pick-up unit mature technology; Mainly be to adopt catalysis or electrochemical sensor; And this type of sensor exists shortcoming such as be prone to poison, accuracy of detection is low, serviceable life is short; Therefore, the CO infrared sensor detection technique that has a good development prospect has received insider's generally attention.
Generally, CO
2Aerial concentration value is probably about 400PPm, and airborne CO concentration has only several PPm, and, CO
2Also there is certain absorption at the place at the 4.6um of CO absorption peak, therefore, and CO
2Particularly the measurement influence of low concentration is bigger to the measurement of CO infrared sensor.Usually, solve CO
2The method of disturbing is: add filtration unit in gas circuit the place ahead, the CO in the elimination CO gas to be measured
2Gas, but the effect of this method is not fine, also need regularly replace medium simultaneously, very inconvenience.
In order to solve the problem of above existence, people are seeking a kind of desirable technical solution always.
Summary of the invention
The objective of the invention is deficiency, can eliminate CO fully thereby provide a kind of to prior art
2To CO gasmetry influence and ability while measure CO and CO
2The CO gas measuring method of the triple channel infrared gas sensor of gas concentration.
To achieve these goals; The technical scheme that the present invention adopted is: a kind of CO gas measuring method of triple channel infrared gas sensor; Comprise: the infrared light supply module is sent the wideband pulse infrared light, then three output of triple channel infrared gas detector output signal: the reference channel output signal at 4.0um absorption peak place
, 4.26um absorption peak place CO
2Passage output signal
CO passage output signal with 4.6um absorption peak place
Three output signals have following relation:
Wherein,
The intensity of light source at expression 4.0um place,
The light source intensity at expression 4.26um place,
The light source intensity at expression 4.6um place,
Represent the responsiveness of triple channel infrared gas detector at the 4.0um place,
Represent the responsiveness of triple channel infrared gas detector at the 4.26um place,
Represent the responsiveness of triple channel infrared gas detector at the 4.6um place,
The transmittance of air chamber is measured in expression,
Expression CO
2Gas is in the transmittance at 4.26um place,
Expression CO
2Gas is in the transmittance at 4.6um place,
Expression CO gas is in the transmittance at 4.6um place;
Can know that by Bill's Lambert law gas transmittance and gas concentration have following relation:
Wherein, k representes the absorption coefficient of gas, and c representes the concentration of gas, and l representes the absorption thickness of gas;
This measuring method may further comprise the steps:
Step 1, set up CO
2Gas concentration question blank: when infrared light source module sends the wideband pulse infrared light, and in said measurement air chamber, feed the CO of variable concentrations respectively
2The time, then signal is exported in three of triple channel infrared gas detector outputs, by concerning that 1-1 can know following relation
Because the spectral distribution of same light source intensity is constant; Can know
with the ratio of
be definite value; Simultaneously; The ratio of the responsiveness of same triple channel infrared eye different wave length also is a definite value; Then make
and compare, can obtain the corresponding relation between the ratio of ratio,
and
of
and
with
Know that by aforementioned A is known definite value;
Make
With
Compare, can obtain
With
Ratio, CO
2Gas is in the transmittance at 4.26um place
Between corresponding relation
Know that by aforementioned B is known definite value;
By concerning 1-4 and concerning 1-5, set up about CO
2Concentration,
With
Ratio,
With
Ratio between the CO of corresponding relation
2The gas concentration question blank;
Set up CO gas concentration question blank: when infrared light source module sends the wideband pulse infrared light; And when in said measurement air chamber, feeding the CO gas of variable concentrations respectively; Then signal is exported in three of triple channel infrared gas detector outputs, by concerning that 1-1 can know following relation
Make
and compare, get ratio, the corresponding relation of CO gas between the transmittance
at 4.6um place of
and
with
Know that by aforementioned D is known definite value;
By concerning 1-7, set up CO gas concentration question blank about corresponding relation between the ratio of CO concentration,
and
;
Step 2, gas concentration measurement: when infrared light source module sends the wideband pulse infrared light, and in said measurement air chamber, feed CO gas to be measured, then three output of triple channel infrared gas detector output signals;
Then, by
With
Ratio, through CO
2The gas concentration question blank checks in CO
2Concentration,
With
Ratio, and then, according to the A value with concern 1-4, can calculate
With
Ratio;
Based on concerning 1-1, make
Then; Ratio with
with
multiply by
ratio with
that A calculates; Again marriage relation 1-7 with concern 1-8; And, check in CO concentration through CO gas concentration question blank.
In this inventive method, there is corresponding relationship between the transmittance of gas and the gas concentration, export the ratio of signal and the relation between the gas concentration through utilizing infrared eye, set up CO
2With CO gas concentration question blank, eliminated the CO that is contained among the CO
2To the influence of measure CO gas concentration, the precision of raising CO gas concentration measurement is the contained CO of energy measurement also
2Concentration, be particularly suitable for the CO gas concentration measurement of low concentration.
Embodiment
Through embodiment, technical scheme of the present invention is done further detailed description below.
A kind of CO gas measuring method of triple channel infrared gas sensor comprises: the infrared light supply module is sent the wideband pulse infrared light, then three output of triple channel infrared gas detector output signal: the reference channel output signal at 4.0um absorption peak place
, 4.26um absorption peak place CO
2Passage output signal
CO passage output signal with 4.6um absorption peak place
Three output signals have following relation:
Wherein,
The intensity of light source at expression 4.0um place,
The light source intensity at expression 4.26um place,
The light source intensity at expression 4.6um place,
Represent the responsiveness of triple channel infrared gas detector at the 4.0um place,
Represent the responsiveness of triple channel infrared gas detector at the 4.26um place,
Represent the responsiveness of triple channel infrared gas detector at the 4.6um place,
The transmittance of air chamber is measured in expression,
Expression CO
2Gas is in the transmittance at 4.26um place,
Expression CO
2Gas is in the transmittance at 4.6um place,
Expression CO gas is in the transmittance at 4.6um place.
Can know by above formula, under same light source, the output signal
Can receive CO
2The responsiveness of concentration, detector
And the transmittance of air chamber
Influence; The output signal
Can receive CO concentration, CO
2The responsiveness of concentration, detector
Transmittance with air chamber
Common influence; With reference to the output signal
Only receive the responsiveness of detector
With the air chamber transmittance
Influence.
Can know that by Bill's Lambert law gas transmittance and gas concentration have following relation:
Wherein, k representes the absorption coefficient of gas, and c representes the concentration of gas, and l representes the absorption thickness of gas.
Can know that by Bill's Lambert law the concentration of gas and the transmittance of gas have relation one to one under the absorption coefficient situation consistent with absorption thickness.
This measuring method may further comprise the steps:
Step 1, in said measurement air chamber, feed the CO of variable concentrations respectively
2Gas is to set up CO
2The gas concentration question blank:
When infrared light source module sends the wideband pulse infrared light, and in said measurement air chamber, feed the CO of variable concentrations
2The time, then signal is exported in three of triple channel infrared gas detector outputs, by concerning that 1-1 can know following relation
Because the spectral distribution of same light source intensity is constant; Can know
with the ratio of
be definite value; Simultaneously; The ratio of the responsiveness of same triple channel infrared eye different wave length also is a definite value; Then make
and compare, can obtain the corresponding relation between the ratio of ratio,
and
of
and
with
Know that by aforementioned A is known definite value;
Make
With
Compare, can obtain
With
Ratio, CO
2Gas is in the transmittance at 4.26um place
Between corresponding relation
Know that by aforementioned B is known definite value;
By concerning 1-4 and concerning 1-5, set up about CO
2Concentration,
With
Ratio,
With
Ratio between the CO of corresponding relation
2The gas concentration question blank, as shown in table 1.
Table 1:
In said measurement air chamber, feed the CO gas of variable concentrations respectively, to set up CO gas concentration question blank:
When infrared light source module sends the wideband pulse infrared light, and when in said measurement air chamber, feeding the CO gas of variable concentrations, three output of triple channel infrared gas detector output signals then are by concerning that 1-1 can know following relation
Make
and compare, get ratio, the corresponding relation of CO gas between the transmittance
at 4.6um place of
and
with
Know that by aforementioned D is known definite value;
By concerning 1-7; Foundation is about the CO gas concentration question blank of corresponding relation between the ratio of CO concentration,
and
, and is as shown in table 2.
Table 2:
The concentration of CO | |
c1 | D1 |
c2 | D2 |
c3 | D3 |
c4 | D4 |
Step 2, in said measurement air chamber, feed CO gas to be measured, carry out gas concentration measurement:
Then, by
With
Ratio, through CO
2The gas concentration question blank checks in CO
2Concentration,
With
Ratio, and then, according to the A value with concern 1-4, can calculate
With
Ratio;
Can know by formula 1-8, in the formula
/
Be CO
2To the influence of CO, and
With
Ratio by
With
Ratio calculation draw,
With
Ratio multiply by
With
The Query Value than worth CO gas concentration question blank, thereby eliminate CO
2To the influence of CO measurement of concetration, through inquiry CO gas concentration question blank, the concentration of the pairing CO of Query Value is the CO concentration of required measurement.
Can know that by above method step this method has been eliminated contained CO in the CO gas
2Gas has not only improved the degree of accuracy of CO gas concentration measurement to the influence of CO gas concentration measurement, goes back the contained CO of energy measurement
2The concentration of gas, but also be particularly suitable for the CO gasmetry of low concentration.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although with reference to preferred embodiment the present invention has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can specific embodiments of the invention make amendment or the part technical characterictic is equal to replacement; And not breaking away from the spirit of technical scheme of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (1)
1. the CO gas measuring method of a triple channel infrared gas sensor, comprising: the infrared light supply module is sent the wideband pulse infrared light, then three output of triple channel infrared gas detector output signals: the reference channel output signal at 4.0um absorption peak place
, 4.26um absorption peak place CO
2Passage output signal
CO passage output signal with 4.6um absorption peak place
Three output signals have following relation:
Wherein,
The intensity of light source at expression 4.0um place,
The light source intensity at expression 4.26um place,
The light source intensity at expression 4.6um place,
Represent the responsiveness of triple channel infrared gas detector at the 4.0um place,
Represent the responsiveness of triple channel infrared gas detector at the 4.26um place,
Represent the responsiveness of triple channel infrared gas detector at the 4.6um place,
The transmittance of air chamber is measured in expression,
Expression CO
2Gas is in the transmittance at 4.26um place,
Expression CO
2Gas is in the transmittance at 4.6um place,
Expression CO gas is in the transmittance at 4.6um place;
Can know that by Bill's Lambert law gas transmittance and gas concentration have following relation:
Wherein, k representes the absorption coefficient of gas, and c representes the concentration of gas, and l representes the absorption thickness of gas;
It is characterized in that this measuring method may further comprise the steps:
Step 1, set up CO
2Gas concentration question blank: when infrared light source module sends the wideband pulse infrared light, and in said measurement air chamber, feed the CO of variable concentrations respectively
2The time, then signal is exported in three of triple channel infrared gas detector outputs, by concerning that 1-1 can know following relation
Because the spectral distribution of same light source intensity is constant; Can know
with the ratio of
be definite value; Simultaneously; The ratio of the responsiveness of same triple channel infrared eye different wave length also is a definite value; Then make
and compare, can obtain the corresponding relation between the ratio of ratio,
and
of
and
with
Know that by aforementioned A is known definite value;
Make
With
Compare, can obtain
With
Ratio, CO
2Gas is in the transmittance at 4.26um place
Between corresponding relation
Know that by aforementioned B is known definite value;
By concerning 1-4 and concerning 1-5, set up about CO
2Concentration,
With
Ratio,
With
Ratio between the CO of corresponding relation
2The gas concentration question blank;
Set up CO gas concentration question blank: when infrared light source module sends the wideband pulse infrared light; And when in said measurement air chamber, feeding the CO gas of variable concentrations respectively; Then signal is exported in three of triple channel infrared gas detector outputs, by concerning that 1-1 can know following relation
1-6
Make
and compare, get ratio, the corresponding relation of CO gas between the transmittance
at 4.6um place of
and
with
Know that by aforementioned D is known definite value;
By concerning 1-7, set up CO gas concentration question blank about corresponding relation between the ratio of CO concentration,
and
;
Step 2, gas concentration measurement: when infrared light source module sends the wideband pulse infrared light, and in said measurement air chamber, feed CO gas to be measured, then three output of triple channel infrared gas detector output signals;
Then, by
With
Ratio, through CO
2The gas concentration question blank checks in CO
2Concentration,
With
Ratio, and then, according to the A value with concern 1-4, can calculate
With
Ratio;
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Cited By (3)
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CN110114655A (en) * | 2016-11-11 | 2019-08-09 | 微波实验室技术股份公司 | Spectrometer with the discharge lamp with multiple optical paths |
WO2020000361A1 (en) * | 2018-06-29 | 2020-01-02 | 深圳大学 | Medical respiratory carbon dioxide concentration measurement method and apparatus |
CN110927095A (en) * | 2019-12-05 | 2020-03-27 | 成都千嘉科技有限公司 | Gas concentration detection method and system based on spectral energy density |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN110114655A (en) * | 2016-11-11 | 2019-08-09 | 微波实验室技术股份公司 | Spectrometer with the discharge lamp with multiple optical paths |
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CN110927095A (en) * | 2019-12-05 | 2020-03-27 | 成都千嘉科技有限公司 | Gas concentration detection method and system based on spectral energy density |
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