CN109557058B - Method and device for detecting whether gas to be detected contains water molecules - Google Patents
Method and device for detecting whether gas to be detected contains water molecules Download PDFInfo
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- CN109557058B CN109557058B CN201710881817.8A CN201710881817A CN109557058B CN 109557058 B CN109557058 B CN 109557058B CN 201710881817 A CN201710881817 A CN 201710881817A CN 109557058 B CN109557058 B CN 109557058B
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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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
- G01N21/643—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" non-biological material
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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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
- G01N2021/6432—Quenching
Abstract
The invention discloses a method and a system for detecting whether gas to be detected contains water molecules. The method comprises the following steps: step 1, selecting n detection points in a gas detection channel, and setting fluorescent molecules on the 1 st detection point; step 2, transmitting light with the wavelength of the first wavelength to a 1 st detection point on the gas detection channel, and respectively transmitting light with the wavelength of the second wavelength to a 2 nd detection point, … and an nth detection point on the gas detection channel; step 3, after the gas to be detected enters the gas detection channel through the gas inlet of the gas detection channel, respectively collecting light intensity change curves of light with the wavelength of the second wavelength at the n detection points to obtain a first light intensity change curve, a second light intensity change curve, … and an nth light intensity change curve; and 4, determining whether the gas to be detected contains water molecules or not based on the first light intensity change curve, the second light intensity change curve, … and the light intensity reduction information and the light intensity recovery information indicated by the nth light intensity change curve.
Description
Technical Field
The invention relates to the field of gas detection, in particular to a method and a device for detecting whether gas to be detected contains water molecules.
Background
At present, when gas is detected, if the gas contains water molecules, an accurate detection result cannot be obtained.
For example, in the detection device of the reaction principle of fluorescent polymer molecules or fluorescent self-assembled small molecules on the market, most of the detection devices use a wiping sheet to wipe a substance to be detected and then perform detection during sampling. However, if the substance to be detected is wet or liquid, it will cause a great trouble to the fluorescence detection. Although the fluorescent molecules do not undergo a fluorescence quenching reaction with water molecules, the water molecules obstruct propagation of excitation light, so that a detection value is shifted, and a correct detection result cannot be obtained.
Therefore, a method and an apparatus capable of detecting whether or not water molecules are contained in gas are required so that measures can be taken to eliminate the influence of the water molecules on the inspection result when water molecules are contained.
Disclosure of Invention
In order to solve the problems of the method and the device for detecting the gas containing water molecules in the prior art, the method and the device for detecting whether the gas to be detected contains water molecules are provided.
According to an aspect of the present invention, there is provided a method for detecting whether a gas to be measured contains water molecules, the method comprising:
step 1, selecting n detection points in a gas detection channel, and arranging fluorescent molecules on the 1 st detection point, wherein n is a positive integer greater than or equal to 2;
step 2, transmitting light with the first wavelength to a 1 st detection point on the gas detection channel, and respectively transmitting light with the second wavelength to a 2 nd detection point, … nd detection point and an nth detection point on the gas detection channel, wherein the second wavelength is equal to the wavelength obtained after the light with the first wavelength reacts with the fluorescent molecules on the 1 st detection point;
step 3, after the gas to be detected enters the gas detection channel through the gas inlet of the gas detection channel, respectively collecting light intensity change curves of light with the wavelength of the n detection points being a second wavelength to obtain a first light intensity change curve, a second light intensity change curve, … and an nth light intensity change curve;
and 4, determining whether the gas to be detected contains water molecules or not based on the first light intensity change curve, the second light intensity change curve, …, the light intensity reduction information indicated by the nth light intensity change curve and the light intensity recovery information.
Wherein the step 4 comprises:
obtaining the maximum percentage a of the light intensity decrease of the first light intensity variation curve, the second light intensity variation curve, … and the nth light intensity variation curve1、a2、…、anAnd maximum percentage of light intensity recovery b1、b2、…、bn；
Based on the maximum percentage a of intensity reduction obtained1、a2、…、anAnd maximum percentage of light intensity recovery b1、b2、…、bnAnd determining whether the gas to be detected contains water molecules.
Wherein, the step 4 further comprises:
calculating a2、…、anIs obtained as an arithmetic mean of0Calculate b2、…、bnIs obtained as the arithmetic mean of0And the following analyses were performed:
(1) if a0And b0Are all less than a set first threshold value, and a1、b1Are all not zero, and are all not zero,
if the value of (a) is less than a set second threshold value, determining that the gas to be detected does not contain water molecules;
(2) if a0、b0Are all not zero, and a0＝b0And determining that the gas to be detected contains water molecules.
Wherein the set first threshold is 0.2%, and the set second threshold is 70%.
Wherein, the distance from the 1 st detection point to the air inlet is close to the distance from the 2 nd detection point, … and the nth detection point to the air inlet.
According to another aspect of the present invention, there is provided an apparatus for detecting whether a gas to be measured contains water molecules, the apparatus comprising:
the gas detection channel comprises a gas inlet for allowing gas to be detected to enter the gas detection channel and n detection points, wherein the 1 st detection point is provided with fluorescent molecules, and n is a positive integer greater than or equal to 2;
the first light emitter is used for emitting light with a first wavelength and transmitting the light with the first wavelength to a 1 st detection point on the gas detection channel;
the second light emitter is used for emitting light with the wavelength of the second wavelength, and respectively transmitting the light with the wavelength of the second wavelength to the 2 nd detection point, … th detection point and the nth detection point on the gas detection channel, wherein the second wavelength is equal to the wavelength obtained after the light with the wavelength of the first wavelength reacts with the fluorescent molecules on the 1 st detection point;
the n light sensors are used for respectively collecting light intensity change curves of light with the wavelength of the second wavelength at the n detection points after the gas to be detected enters the gas detection channel through the gas inlet of the gas detection channel to obtain a first light intensity change curve, a second light intensity change curve, … and an nth light intensity change curve;
and the gas analyzer to be detected is used for determining whether the gas to be detected contains water molecules or not based on the first light intensity change curve, the second light intensity change curve, …, the light intensity reduction information and the light intensity recovery information indicated by the nth light intensity change curve.
Wherein the gas analyzer to be tested is configured to:
obtaining the maximum percentage a of the light intensity decrease of the first light intensity variation curve, the second light intensity variation curve, … and the nth light intensity variation curve1、a2、…、anAnd maximum percentage of light intensity recovery b1、b2、…、bn；
Based on the maximum percentage a of intensity reduction obtained1、a2、…、anAnd maximum percentage of light intensity recovery b1、b2、…、bnAnd determining whether the gas to be detected contains water molecules.
Wherein the gas analyzer to be tested is further configured to:
calculating a2、…、anIs obtained as an arithmetic mean of0Calculate b2、…、bnIs obtained as the arithmetic mean of0And the following analyses were performed:
(1) if a0And b0Are all less than a set first threshold value, and a1、b1Are all not zero, and are all not zero,
if the value of (a) is less than a set second threshold value, determining that the gas to be detected does not contain water molecules;
(2) if a0、b0Are all not zero, and a0＝b0And determining that the gas to be detected contains water molecules.
Wherein the set first threshold is 0.2%, and the set second threshold is 70%.
Wherein the apparatus further comprises:
pair 1, pair 2, pair …, pair n, wherein each pair includes two optical filters,
two optical filters of the 1 st pair of optical filters are respectively arranged between the 1 st light emitter and the 1 st detection point and between the 1 st detection point and the 1 st light sensor; two optical filters of the 2 nd pair of optical filters are respectively arranged between the 2 nd light emitter and the 2 nd detection point and between the 2 nd detection point and the 2 nd light sensor; two optical filters of the 3 rd pair of optical filters are respectively arranged between the 2 nd light emitter and the 3 rd detection point and between the 3 rd detection point and the 3 rd light sensor; by analogy, two optical filters in the nth pair of optical filters are respectively arranged between the 2 nd light emitter and the nth detection point and between the nth detection point and the nth light sensor;
in the 1 st pair of optical filters, the optical filter disposed between the 1 st light emitter and the 1 st detection point allows light having a first wavelength to pass therethrough, and the 1 st pair of optical filters disposed between the 1 st detection point and the 1 st photo sensor and the 2 nd pair of optical filters, … and the n-th pair of optical filters each allow light having a second wavelength to pass therethrough.
According to the method and the device for detecting the gas containing the water molecules, whether the gas to be detected contains the water molecules or not is judged by utilizing the light intensity curve with the fluorescence quenching reaction and the light intensity curve without the fluorescence quenching reaction, so that the probability of false alarm of the gas to be detected in the fluorescence detection method of the gas is reduced or completely solved. In addition, each detection point in the detection channel is provided with an independent light source and an independent light sensor, and no interference exists between the light source and the light sensor in the detection channel, so that the difficulty of hardware denoising and software denoising is reduced, and the accuracy of data acquisition and the accuracy of gas detection are further ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method for detecting whether a gas to be tested contains water molecules according to the present invention;
FIGS. 2, 3 and 4 are graphs of light intensity collected at detection points according to the present invention;
fig. 5 is a schematic view of an apparatus for detecting whether a gas to be measured contains water molecules according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The invention provides a detection method for gas containing water molecules, as shown in figure 1, the method comprises the following steps:
102, transmitting light with a first wavelength to a 1 st detection point on the gas detection channel, and respectively transmitting light with a second wavelength to a 2 nd detection point, … nd detection point and an nth detection point on the gas detection channel, wherein the second wavelength is equal to the wavelength obtained after the light with the first wavelength reacts with fluorescent molecules on the 1 st detection point;
103, after the gas to be detected enters the gas detection channel through the gas inlet of the gas detection channel, respectively collecting light intensity change curves of light with the wavelength of the second wavelength at the n detection points to obtain a first light intensity change curve, a second light intensity change curve, … and an nth light intensity change curve;
and 104, determining whether the gas to be detected contains water molecules or not based on the first light intensity change curve, the second light intensity change curve, …, the light intensity reduction information indicated by the nth light intensity change curve and the light intensity recovery information.
It should be noted that the n detection points are selected in the above scheme, so that the detection result is more accurate, that is, the average value of the curves acquired at the 2 nd detection point, the … and the n th detection point is used to obtain the attribute of the gas to be detected. In practice, only two detection points may be selected for convenience.
In addition, the light intensity decreasing information and the light intensity recovering information in step 104 may be the light intensity decreasing percentage and the light intensity recovering percentage represented by the light intensity variation curve, or may be the light intensity decreasing value and the light intensity recovering value.
The principle behind this monitoring method is that two detection spots A, B are provided in one gas detection channel, one of which is coated with fluorescent molecules and the other of which is not coated with fluorescent molecules. Light of a first wavelength, for example, light of 300nm, is transmitted to the detection point A and reacts with the fluorescent molecule to generate light of a second wavelength, for example, light of 400 nm. Light of the second wavelength, that is, light of a wavelength of 400nm is transmitted to the detection point B. After the gas to be detected enters the gas detection channel through the gas inlet of the gas detection channel, because the two detection points are arranged in the gas detection channel, the light intensity change curve of the light with the second wavelength obtained by the reaction of the light with the first wavelength of the detection point A and fluorescent molecules and the light intensity change curve of the light with the second wavelength transmitted from the detection point B are influenced by water molecules contained in the gas to be detected in the gas detection channel. In addition, the gas to be detected can also react with the fluorescent molecules arranged at the detection point A to cause fluorescence quenching, so that the fluorescent molecules which react with the light with the first wavelength can be reduced, the light with the second wavelength obtained by the reaction is reduced, and the light intensity of the light with the second wavelength collected at the detection point A is obviously reduced. By using the light intensity change curve of the light with the second wavelength collected at the detection point B, the condition that the light intensity of the light with the second wavelength at the detection point A is changed only due to the reaction of the gas to be detected and the fluorescent molecules can be obtained, and the attribute of the gas to be detected can be further judged.
Step 104 specifically includes: obtaining the maximum percentage a of the light intensity decrease of the first light intensity variation curve, the second light intensity variation curve, … and the nth light intensity variation curve1、a2、…、anAnd maximum percentage of light intensity recovery b1、b2、…、bn(ii) a Based on the maximum percentage a of intensity reduction obtained1、a2、…、anAnd maximum percentage of light intensity recovery b1、b2、…、bnAnd determining whether the gas to be detected contains water molecules.
Specifically, step 104 further includes: calculating a2、…、anIs obtained as an arithmetic mean of0Calculate b2、…、bnIs obtained as the arithmetic mean of0And the following analyses were performed:
(1) if a0And b0Are all less than a set first threshold value, and a1、b1Are all not zero, and are all not zero,
if the value of (a) is less than a set second threshold value, determining that the gas to be detected does not contain water molecules;
(2) if a0、b0Are all not zero, and a0＝b0And determining that the gas to be detected contains water molecules.
When a is to be noted0、b0And when the value is zero, the gas to be detected does not contain water molecules. But due to possible measurement errors, a0、b0May not be completely equal to zero. Here, a0-0 and b0The values of-0 are all less than a first threshold value set in order to prevent a caused by measurement errors0、b0Case not exactly equal to zero. The first threshold value may be set according to the actual situation, for example, the set first threshold value is 0.2%.
The second threshold value to be set is also set according to actual conditions based on the concentration of the gas to be measured, and is usually set to 70%.
In actual analysis, the following three cases may occur:
first case, a0、b0、a1、b1Are all not zero, and a0＝b0、a1＝b1That is, the maximum percentage of the light intensity reduction is equal to the maximum percentage of the light intensity recovery, and at this time, the gas to be detected is all water vapor.
Second case, a0And b0Are all less than a set first threshold value, and a1、b1Are all not zero, and are all not zero,
if the value of (b) is less than the set second threshold value, it is determined that the gas to be measured does not contain water molecules because the gas to be measured reacts with the fluorescent molecules when the gas to be measured is other than water vapor, resulting in fluorescence quenching, such that the fluorescent molecules that react with the light of the first wavelength are reduced, and the light of the second wavelength obtained by the reaction is reduced, generally b1Will be more than a1Less than about 70 percentThis value will vary with the concentration of the gas to be measured. In addition, when no water molecule is contained, the light intensity curves collected at the 2 nd detection point, … and the n th detection point are not influenced, so a0、b0Almost zero.
In the third case, if a0、b0Are all not zero, and a0＝b0And determining that the gas to be detected contains water molecules. Wherein, a1-a0Then the true percentage reduction of the target gas, b0-b1It is the true percentage of recovery of the target gas from which the two sets of differences can be used to determine what type of gas the target gas is. The present invention is directed to determining whether a gas to be measured contains water vapor, and therefore, the determination of the type of the gas will not be described in detail.
In the third case, when determining what type of target gas is, it is necessary to perform determination in combination with the fluorescent molecule used.
It should be noted that, in the above certain case, a is an error in measurement0May not be exactly equal to b0，a1May not be exactly equal to b1If the difference is within the allowable range, a is regarded as0＝b0、a1＝b1。
The principle of judging whether the gas to be detected has water molecules or not based on the light intensity reduction percentage and the light intensity recovery percentage obtained from each detection point is given above.
In addition, the distance from the 1 st detection point to the air inlet is close to the distance from the 2 nd detection point, … and the nth detection point to the air inlet. The reason for this arrangement is that after the gas to be measured enters the gas path and during the process of passing through the whole gas path, the gas path is contaminated to a certain extent, and therefore, the concentration of the gas to be measured decreases progressively from the gas inlet to the gas outlet. As the 1 st detection point is coated with the fluorescent micromolecules, the gas to be detected firstly contacts the 1 st detection point, and the sensitivity of the gas to be detected can be improved.
It should be noted that, here, only two detection points are provided, and actually, a plurality of detection points may be provided, and the average value of the values on the light intensity variation curve of the light of the second wavelength collected at other positions may be calculated as the value of the 2 nd detection point.
A specific example of the method for detecting a gas containing water molecules according to the present invention is given below, and in this example, taking two detection points as an example, the light intensity curves collected at the first detection point and the second detection point may be as shown in fig. 2, fig. 3, or fig. 4, where the horizontal axis represents time and the vertical axis represents light intensity. The method comprises the following steps:
step 1, selecting a first detection point and a second detection point in a gas detection channel, and arranging fluorescent molecules on the first detection point, wherein the distance from the first detection point to a gas inlet of the gas detection channel is close to the distance from the second detection point to the gas inlet;
step 2, transmitting light with the wavelength of 300nm to a first detection point on the gas detection channel, reacting with fluorescent molecules on the first detection point to obtain light with the wavelength of 400nm, and transmitting the light with the wavelength of 400nm to a second detection point on the gas detection channel;
step 3, enabling the gas to be detected to enter through a gas inlet of the gas detection channel;
step 4, collecting a light intensity change curve of light with the wavelength of 400nm on the first detection point, and collecting a light intensity change curve of light with the wavelength of 400nm on the second detection point;
and 5, acquiring the attribute of the gas to be detected based on the two collected light intensity change curves. The percentage of light intensity reduction and the percentage of light intensity restoration obtained at the first detection point are a1、b1The percentage of decrease in light intensity and the percentage of recovery of light intensity obtained at the second detection point are a0、b0。
A description of specific cases is given below:
(1) the light intensity variation curves of the first detection point and the second detection point are the same and are both shown in fig. 2. Wherein the content of the first and second substances,
a1＝1.91％，b1＝1.91％，a0＝1.91％，b0＝1.91％，
namely, a1、b1、a0、b0Are all not zero, and a1＝b1，a0＝b0In this case, the gas to be measured contains water vapor and is pure water vapor.
(2) The light intensity variation curves of the first detection point and the second detection point are different, as shown in fig. 3 and 4, respectively, wherein,
a1＝3.04％，b1＝1.07％，a0＝0.11％，b0＝0.11％，
wherein, a0And b0Almost zero, i.e., the change quenching phenomenon hardly occurs, and,
in this case, the gas to be measured does not contain water vapor and is the target gas.
In addition, a first optical filter may be disposed on a light path through which 300nm light is transmitted to the first detection point to allow only 300nm light to pass, a second optical filter may be disposed between the first detection point and the photo sensor to allow only 400nm light to pass, thereby collecting only a change in light intensity of 400nm light, a third optical filter may be disposed on a light path through which 400nm light is transmitted to the second detection point to allow only 400nm light to pass, and a fourth optical filter may be disposed between the second detection point and the photo sensor to allow only 400nm light to pass, thereby collecting only a change in light intensity of 400nm light.
The present invention also provides an apparatus for detecting whether a gas to be detected contains water molecules, as shown in fig. 5, the apparatus including:
the gas detection channel comprises a gas inlet for allowing gas to be detected to enter the gas detection channel and n detection points, wherein the 1 st detection point is provided with fluorescent molecules, and n is a positive integer greater than or equal to 2;
the first light emitter is used for emitting light with a first wavelength and transmitting the light with the first wavelength to a 1 st detection point on the gas detection channel;
the second light emitter is used for emitting light with the wavelength of the second wavelength, and respectively transmitting the light with the wavelength of the second wavelength to the 2 nd detection point, … th detection point and the nth detection point on the gas detection channel, wherein the second wavelength is equal to the wavelength obtained after the light with the wavelength of the first wavelength reacts with the fluorescent molecules on the 1 st detection point;
the n light sensors are used for respectively collecting light intensity change curves of light with the wavelength of the second wavelength at the n detection points after the gas to be detected enters the gas detection channel through the gas inlet of the gas detection channel to obtain a first light intensity change curve, a second light intensity change curve, … and an nth light intensity change curve;
and the gas analyzer to be detected is used for determining whether the gas to be detected contains water molecules or not based on the first light intensity change curve, the second light intensity change curve, …, the light intensity reduction information and the light intensity recovery information indicated by the nth light intensity change curve.
It should be noted that the second light emitter transmits light having the second wavelength to the 2 nd detection point, …, and the nth detection point on the gas detection channel, respectively, but may include n-1 light emitters capable of emitting light having the second wavelength and transmit light having the second wavelength to the 2 nd detection point, …, and the nth detection point on the gas detection channel, respectively.
Wherein the gas analyzer to be tested is configured to:
obtaining the maximum percentage a of the light intensity decrease of the first light intensity variation curve, the second light intensity variation curve, … and the nth light intensity variation curve1、a2、…、anAnd maximum percentage of light intensity recovery b1、b2、…、bn；
Based on the maximum percentage a of intensity reduction obtained1、a2、…、anAnd maximum percentage of light intensity recovery b1、b2、…、bnAnd determining whether the gas to be detected contains water molecules.
Wherein the gas analyzer to be tested is further configured to:
calculating a2、…、anIs obtained as an arithmetic mean of0Calculate b2、…、bnIs arithmetic mean ofTo obtain b0And the following analyses were performed:
(1) if a0And b0Are all less than a set first threshold value, and a1、b1Are all not zero, and are all not zero,
if the value of (a) is less than a set second threshold value, determining that the gas to be detected does not contain water molecules;
(2) if a0、b0Are all not zero, and a0＝b0And determining that the gas to be detected contains water molecules.
Wherein the set first threshold is 0.2%, and the set second threshold is 70%.
Wherein the apparatus further comprises:
pair 1, pair 2, pair …, pair n, wherein each pair includes two optical filters,
two optical filters of the 1 st pair of optical filters are respectively arranged between the 1 st light emitter and the 1 st detection point and between the 1 st detection point and the 1 st light sensor; two optical filters of the 2 nd pair of optical filters are respectively arranged between the 2 nd light emitter and the 2 nd detection point and between the 2 nd detection point and the 2 nd light sensor; two optical filters of the 3 rd pair of optical filters are respectively arranged between the 2 nd light emitter and the 3 rd detection point and between the 3 rd detection point and the 3 rd light sensor; by analogy, two optical filters in the nth pair of optical filters are respectively arranged between the 2 nd light emitter and the nth detection point and between the nth detection point and the nth light sensor;
in the 1 st pair of optical filters, the optical filter disposed between the 1 st light emitter and the 1 st detection point allows light having a first wavelength to pass therethrough, and the 1 st pair of optical filters disposed between the 1 st detection point and the 1 st photo sensor and the 2 nd pair of optical filters, … and the n-th pair of optical filters each allow light having a second wavelength to pass therethrough.
According to the method and the device for detecting the gas containing the water molecules, whether the gas to be detected contains the water molecules or not is judged by utilizing the light intensity curve with the fluorescence quenching reaction and the light intensity curve without the fluorescence quenching reaction, so that the probability of false alarm of the gas to be detected in the fluorescence detection method of the gas is reduced or completely solved. In addition, each detection point in the detection channel is provided with an independent light source and an independent light sensor, and no interference exists between the light source and the light sensor in the detection channel, so that the difficulty of hardware denoising and software denoising is reduced, and the accuracy of data acquisition and the accuracy of gas detection are further ensured.
It is to be noted that, in this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that an article or apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The above embodiments are merely to illustrate the technical solutions of the present invention and not to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it should be understood that the present invention is to be covered by the appended claims.
Claims (6)
1. A method for detecting whether a gas to be tested contains water molecules, the method comprising:
step 1, selecting n detection points in a gas detection channel, and arranging fluorescent molecules on the 1 st detection point, wherein n is a positive integer greater than or equal to 2;
step 2, transmitting light with the first wavelength to a 1 st detection point on the gas detection channel, and respectively transmitting light with the second wavelength to a 2 nd detection point, … nd detection point and an nth detection point on the gas detection channel, wherein the second wavelength is equal to the wavelength obtained after the light with the first wavelength reacts with the fluorescent molecules on the 1 st detection point;
step 3, after the gas to be detected enters the gas detection channel through the gas inlet of the gas detection channel, respectively collecting light intensity change curves of light with the wavelength of the n detection points being a second wavelength to obtain a first light intensity change curve, a second light intensity change curve, … and an nth light intensity change curve;
step 4, determining whether the gas to be detected contains water molecules or not based on the first light intensity change curve, the second light intensity change curve, …, the light intensity reduction information and the light intensity recovery information indicated by the nth light intensity change curve;
the step 4 comprises the following steps:
obtaining the maximum percentage a of the light intensity decrease of the first light intensity variation curve, the second light intensity variation curve, … and the nth light intensity variation curve1、a2、…、anAnd maximum percentage of light intensity recovery b1、b2、…、bn；
Based on the maximum percentage a of intensity reduction obtained1、a2、…、anAnd maximum percentage of light intensity recovery b1、b2、…、bnDetermining whether the gas to be detected contains water molecules;
the step 4 further comprises:
calculating a2、…、anIs obtained as an arithmetic mean of0Calculate b2、…、bnIs obtained as the arithmetic mean of0And the following analyses were performed:
(1) if the values of a0 and b0 are both less than the set first threshold value, and a1、b1Are all not zero, and are all not zero,
if the value of (a) is less than a set second threshold value, determining that the gas to be detected does not contain water molecules;
(2) if a0、b0Are all not zero, and a0=b0And determining that the gas to be detected contains water molecules.
2. The method of claim 1, wherein the set first threshold is 0.2% and the set second threshold is 70%.
3. The method of claim 1,
the distance from the 1 st detection point to the air inlet is close to the distance from the 2 nd detection point, … and the nth detection point to the air inlet.
4. An apparatus for detecting whether a gas to be measured contains water molecules, the apparatus comprising:
the gas detection channel comprises a gas inlet for allowing gas to be detected to enter the gas detection channel and n detection points, wherein the 1 st detection point is provided with fluorescent molecules, and n is a positive integer greater than or equal to 2;
the first light emitter is used for emitting light with a first wavelength and transmitting the light with the first wavelength to a 1 st detection point on the gas detection channel;
the second light emitter is used for emitting light with the wavelength of the second wavelength, and respectively transmitting the light with the wavelength of the second wavelength to the 2 nd detection point, … th detection point and the nth detection point on the gas detection channel, wherein the second wavelength is equal to the wavelength obtained after the light with the wavelength of the first wavelength reacts with the fluorescent molecules on the 1 st detection point;
the n light sensors are used for respectively collecting light intensity change curves of light with the wavelength of the second wavelength at the n detection points after the gas to be detected enters the gas detection channel through the gas inlet of the gas detection channel to obtain a first light intensity change curve, a second light intensity change curve, … and an nth light intensity change curve;
the gas analyzer to be detected is used for determining whether the gas to be detected contains water molecules or not based on the first light intensity change curve, the second light intensity change curve, …, the light intensity reduction information and the light intensity recovery information indicated by the nth light intensity change curve;
the gas analyzer to be tested is used for:
obtaining the maximum percentage a of the light intensity decrease of the first light intensity variation curve, the second light intensity variation curve, … and the nth light intensity variation curve1、a2、…、anAnd maximum percentage of light intensity recovery b1、b2、…、bn；
Based on the maximum percentage a of intensity reduction obtained1、a2、…、anAnd maximum percentage of light intensity recovery b1、b2、…、bnDetermining whether the gas to be detected contains water molecules;
the gas analyzer to be tested is further configured to:
calculating a2、…、anIs obtained as an arithmetic mean of0Calculate b2、…、bnIs obtained as the arithmetic mean of0And the following analyses were performed:
(1) if the values of a0 and b0 are both less than the set first threshold value, and a1、b1Are all not zero, and are all not zero,
if the value of (a) is less than a set second threshold value, determining that the gas to be detected does not contain water molecules;
(2) if a0、b0Are all not zero, and a0=b0And determining that the gas to be detected contains water molecules.
5. The apparatus of claim 4, wherein the set first threshold is 0.2% and the set second threshold is 70%.
6. The apparatus of claim 4, wherein the apparatus further comprises:
pair 1, pair 2, pair …, pair n, wherein each pair includes two optical filters,
two optical filters of the 1 st pair of optical filters are respectively arranged between the first light emitter and the 1 st detection point and between the 1 st detection point and the 1 st optical sensor; two optical filters of the 2 nd pair of optical filters are respectively arranged between the second light emitter and the 2 nd detection point and between the 2 nd detection point and the 2 nd optical sensor; by analogy, two optical filters in the nth pair of optical filters are respectively arranged between the second light emitter and the nth detection point and between the nth detection point and the nth light sensor;
in the 1 st pair of optical filters, the optical filter disposed between the first light emitter and the 1 st detection point allows light having a first wavelength to pass therethrough, and the 1 st pair of optical filters disposed between the 1 st detection point and the 1 st photo sensor and the 2 nd pair of optical filters, … and the n-th pair of optical filters each allow light having a second wavelength to pass therethrough.
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