CN105223138A - Gas sensing unit, gas detecting system and gas detection method - Google Patents
Gas sensing unit, gas detecting system and gas detection method Download PDFInfo
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- CN105223138A CN105223138A CN201410248200.9A CN201410248200A CN105223138A CN 105223138 A CN105223138 A CN 105223138A CN 201410248200 A CN201410248200 A CN 201410248200A CN 105223138 A CN105223138 A CN 105223138A
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Abstract
A kind of gas detecting system, it comprises a gas detection cell, and it is configured with a transparency carrier, is configured at the alignment film on described transparency carrier and is configured at the cholesteric liquid epitaxial on described alignment film; One sensing chamber, it can accommodating gas to be measured and have the space at least can placing described gas detection cell; One detect analytic unit, it at least comprises an optical spectrum analyser, its in order to detect gas to be measured infiltrate in described cholesteric liquid epitaxial process through time spectrum change; And a data processing unit, its can according to described through time spectrum change and at least one that obtains in the out-of-service time of transient state spectral response, pitch change, spectral red shift phenomenon and described cholesteric liquid epitaxial; And judge according to this and the characteristic differentiating described gas to be measured.
Description
Technical field
The invention relates to gas sensing unit, gas detecting system and gas detection method, particularly about a kind of gas detection cell comprising transparency carrier, alignment film and cholesteric liquid epitaxial; A kind of gas detecting system comprising described gas sensing unit, sensing chamber, detection analytic unit and data processing unit; And a kind of gas detection method using they.
Background technology
Generally speaking, industrially, the organic gas great majority used in laboratory and medical space all have high volatile volatile, harmfulness and contaminative, when personnel are exposed to the situation in described environment for a long time, then organic gas is just easy via respiratory tract, epidermis even per os and enter in human body, so that beyond thought harm is produced for human body, time serious except possibility is carcinogenic, even can cause human organ and nervous system failure.Moreover, because the organic gas of majority all has inflammability, in air, easily form high explosive mixture, except meeting harmful to human and environment, and can ecology be affected.Therefore, consider health and Environmental security factor, organic gas existing in monitoring of environmental is very important.
In testing environment organic gas assay method in, be that gaseous sample is delivered to assay laboratory mostly, carry out testing and checking with chemistry or gas coloured light spectrum, thus determine composition and the concentration of organic gas.Owing to there is time delay from transport sample to obtaining testing result, even if there is certain precision and sensitivity based on gas phase coloured light spectrometer and infra-red sepectrometry, electrochemical detection method, to so far, the method for there is no obtains the instant testing result of high reliability.
Thus all circles all look forward to developing a kind of low cost, can detecting fast and have the high gas sensing unit of high sensitivity, precision and fiduciary level, gas detecting system and gas detection method concurrently.
Summary of the invention
In view of this, the present inventor etc. are furtherd investigate for above-mentioned problem, find to be configured with a transparency carrier by using, be configured at the alignment film on described transparency carrier and be configured at the cholesteric liquid epitaxial on described alignment film gas detection cell, use a kind of at least containing the gas detecting system of These gases unit and gas detection method thereof, namely can reach low cost, can detect fast and have the high target of high sensitivity, precision and fiduciary level concurrently, at least complete the present invention.
Namely, according to the first viewpoint of the present invention, a gas sensing unit can be provided, comprise: a transparency carrier; One alignment film, it is configured on described transparency carrier; And a cholesteric liquid epitaxial, it is configured on described alignment film, and can be infiltrated by gas to be measured.In These gases detecting unit, described cholesteric liquid epitaxial also can be had an effect with gas to be measured.
Besides, according to other viewpoints of the present invention, can provide a kind of gas detecting system, comprise: a gas detection cell, it is configured with a transparency carrier, is configured at the alignment film on described transparency carrier and is configured at the cholesteric liquid epitaxial on described alignment film; One sensing chamber, it can accommodating gas to be measured and have the space at least can placing described gas detect list; One detect analytic unit, it at least comprises an optical spectrum analyser, its in order to detect gas to be measured infiltrate in described cholesteric liquid epitaxial process through time spectrum change; And a data processing unit, its can according to described through time spectrum change and at least one that obtains in the out-of-service time of pitch starts transformation period, pitch increases specific factor time, cholesteric liquid epitaxial; And judge according to this and the characteristic differentiating described gas to be measured.
Wherein, can according to described through time spectrum change and calculate according to following formula further and obtain the pitch variable quantity of described cholesteric liquid epitaxial;
p(t)/p(0)＝λ
L(t)/λ
L(0)
Wherein, p represents the pitch of cholesteric liquid epitaxial; λ
lt () represents wavelength on the left of the spectral hand when time t; λ
l(0) initial left side wavelength is represented.
Wherein, at least can differentiate containing being selected from the gas to be measured being made up of at least one in group acetone, butanone, cyclohexanone, dimethylbenzene, normal heptane and combination thereof.
Further, according to other viewpoint of the present invention, a kind of gas detection method can be provided, comprise: provide a gas to be measured in a sensing chamber, described sensing chamber is configured with a transparency carrier, alignment film and be configured on described transparency carrier and is configured at cholesteric liquid epitaxial on described alignment film, and can accommodating gas to be measured; Detect described gas to be measured infiltrate in described cholesteric liquid epitaxial process through time spectrum change curve; According to described through time spectrum change curve, obtained at least one in the out-of-service time of pitch starts transformation period, pitch increases specific factor time, cholesteric liquid epitaxial by computing; And start transformation period, the pitch increase time of specific factor and/or the out-of-service time of cholesteric liquid epitaxial according to described pitch, judge and differentiate the characteristic of described gas to be measured.
Wherein, can according to described through time spectrum change and calculate according to following formula further and obtain the pitch variable quantity of described cholesteric liquid epitaxial;
p(t)/p(0)＝λ
L(t)/λ
L(0)
Wherein, p represents the pitch of cholesteric liquid epitaxial, λ
lt () represents wavelength on the left of the spectral hand when time t; λ
l(0) initial left side wavelength is represented.
Wherein, at least can differentiate containing being selected from the gas to be measured being made up of at least one in group acetone, butanone, cyclohexanone, dimethylbenzene, normal heptane and combination thereof.
Accompanying drawing explanation
Fig. 1 is the calcspar of display according to an embodiment of gas detecting system of the present invention.
Fig. 2 is the schematic diagram of display according to an embodiment of gas detecting system of the present invention.
Fig. 3 is the sectional view of an embodiment of display gas sensor.
Fig. 4 is the process flow diagram of display according to an embodiment of gas detection method of the present invention.
Fig. 5 be display according to cholesteric liquid crystal film of the present invention detect that acetone gas obtains through time spectrum change curve.
Fig. 6 be display according to cholesteric liquid crystal film of the present invention detect that butanone gas obtains through time spectrum change curve.
Fig. 7 be display according to cholesteric liquid crystal film detection ring hexanone gas of the present invention obtain through time spectrum change curve.
Fig. 8 be display according to cholesteric liquid crystal film of the present invention detect that dimethylbenzene gas obtains through time spectrum change curve.
Fig. 9 be display according to cholesteric liquid crystal film of the present invention detect that normal heptane gas obtains through time spectrum change curve.
Figure 10 be display according to cholesteric liquid crystal film of the present invention detect that normal butyl alcohol gas obtains through time spectrum change curve.
Symbol description:
TS gas to be measured
LK signal links
S110 step
S120 step
S130 step
S140 step
P cholesteric liquid epitaxial
1 gas detecting system
10 sensing chamber
20 detect analytic unit
30 data processing units
40 gas sensing units
50 light sources
210 optical spectrum analysers
211 probes
310 processors
320 memory bodys
330 gas characteristic data bank
410 glass substrates
420 alignment films
A1 is about the initial spectrum change curve of acetone gas
A2 to A10 about acetone gas, spectrum change curve when 30 seconds, 60 seconds, 90 seconds, 120 seconds, 150 seconds, 180 seconds, 210 seconds, 240 seconds, 273 seconds
B1 is about the initial spectrum change curve of butanone gas
B2 to B13 about butanone gas, spectrum change curve when 31 seconds, 73 seconds, 93 seconds, 113 seconds, 137 seconds, 157 seconds, 177 seconds, 198 seconds, 219 seconds, 235 seconds, 249 seconds, 260 seconds
C1 is about the initial spectrum change curve of cyclohexanone gas
C2 to C11 about cyclohexanone gas, spectrum change curve when 42 seconds, 72 seconds, 92 seconds, 117 seconds, 138 seconds, 157 seconds, 177 seconds, 202 seconds, 231 seconds, 246 seconds
D1 is about the initial spectrum change curve of dimethylbenzene gas
D2 to D11 about dimethylbenzene gas, spectrum change curve when 30 seconds, 72 seconds, 116 seconds, 154 seconds, 181 seconds, 218 seconds, 254 seconds, 283 seconds, 307 seconds, 332 seconds
E1 is about the initial spectrum change curve of normal heptane gas
E2 to E11 about normal heptane gas, spectrum change curve when 231 seconds, 321 seconds, 415 seconds, 495 seconds, 576 seconds, 657 seconds, 737 seconds, 837 seconds, 900 seconds, 934 seconds
F1 is about the initial spectrum change curve of normal butyl alcohol gas
F2 to F11 about normal butyl alcohol gas, spectrum change curve when 110 seconds, 220 seconds, 331 seconds, 421 seconds, 506 seconds, 589 seconds, 632 seconds, 674 seconds 686 seconds, 697 seconds
Embodiment
For the various aspects making the present invention above-mentioned more becomes apparent, below, further the present invention will be described in detail by accompanying drawing, embodiment.
In this manual, please note: the border of cross reference number additional in the inscape of each drawing, as long as same inscape, even if being presented on different drawings is also add same number as much as possible.
Gas sensing unit of the present invention, comprising: a transparency carrier; One alignment film, it is configured on described transparency carrier; And a cholesteric liquid epitaxial, it is configured on described alignment film, and can be infiltrated by gas to be measured.In These gases detecting unit, described cholesteric liquid epitaxial also can be had an effect with gas to be measured.
Again, as long as be used in the substrate that transparency carrier of the present invention has the transparency, do not limit especially.Such as, the glass substrate, plastic substrate etc. that the transparency is high can be used.
Moreover, as long as be used in the film that alignment film of the present invention has horizontal direction matching function, do not limit especially.Such as, can use by coating pi solution (PI) and the film solidified that heats up.
In addition, as long as be used in the cholesteric liquid epitaxial that cholesteric liquid epitaxial of the present invention is applicable to detect organic gas, do not limit especially.Such as, can use by the cholesterol liquid film by commercially available cholesteric liquid crystal solution (3N1-12A-550-5) coating solidification.
Again, cholesteric liquid epitaxial, except must by except gas to be measured infiltrated, preferably be for also can have an effect with gas to be measured.
Moreover the configuration of gas sensing unit of the present invention forms and do not limit especially, such as, as shown in Figure 3, gas sensing unit 40 can be sequentially configure glass substrate 410, alignment film 420, cholesteric liquid epitaxial P and forming.
In addition, gas detection cell provided by the present invention is the various gases, particularly organic gas that are applicable in testing environment.Namely, be applicable to the kind of the gas to be measured utilizing gas detection cell of the present invention to carry out detecting, do not limit especially; Such as, go for detecting at least can differentiate containing to be selected from by acetone, butanone, cyclohexanone, dimethylbenzene, normal heptane and combination thereof form the gas to be measured of at least one in group.
In addition, gas detecting system provided by the present invention, comprises a gas detection cell, and it is configured with a transparency carrier, is configured at the alignment film on described transparency carrier and is configured at the cholesteric liquid epitaxial on described alignment film; One sensing chamber, it can accommodating gas to be measured and have the space at least can placing described gas detect list; One detects analytic unit, and it at least comprises an optical spectrum analyser, its in order to detect gas to be measured infiltrate in described cholesteric liquid epitaxial process through time spectrum change curve; And a data processing unit, its can according to described through time spectrum change curve and at least one that obtains in the out-of-service time of pitch starts transformation period, pitch increases specific factor time, cholesteric liquid epitaxial; And judge according to this and the characteristic differentiating described gas to be measured.
Again, the sensing chamber used in gas detecting system of the present invention does not limit especially, as long as have spatial accommodation.From detection precision viewpoint, sensing chamber is preferably confined space.
Secondly, the transparency carrier used in gas detecting system of the present invention does not limit especially, as long as have the substrate of the transparency.Such as, the glass substrate, plastic substrate etc. that the transparency is high can be used.
Moreover the alignment film used in gas detecting system of the present invention, as long as not special restriction has the film of orientation function.Such as, can use by rotary coating pi solution (PI) and the film solidified that heats up.
In addition, the cholesteric liquid epitaxial used in gas detecting system of the present invention, does not limit especially, as long as be applicable to the cholesteric liquid epitaxial detecting organic gas.Such as, the cholesteric liquid epitaxial by being coated with by commercially available cholesteric liquid crystal solution (3N1-12A-550-5) can be used.Again, cholesteric liquid epitaxial, except must by except gas to be measured infiltrated, preferably be for can have an effect with gas to be measured.
In addition, the detection analytic unit used in gas detecting system of the present invention at least comprises an optical spectrum analyser.Described optical spectrum analyser does not limit especially, changes as long as can detect the optical property analyzing gas to be measured, cholesteric liquid epitaxial etc.Such as, the detection analytic unit used in gas detecting system of the present invention be at least can detect gas to be measured infiltrate in described cholesteric liquid epitaxial process through time spectrum change curve.
Again, according to other viewpoints of the present invention, because the penetrating of cholesteric liquid crystal film/or the left side sideband of reflective band and the wavelength of right side sideband are respectively λ
l=n
op, λ
r=n
ep, wherein λ
lwith λ
rrepresent wavelength and right side wavelength location on the left of spectral hand respectively; n
0, n
erepresent liquid crystal ordinary refraction index, abnormal optical index respectively, p represents the pitch of cholesteric liquid epitaxial.Due to abnormal optical index n
ecan change along with the ordered state of liquid crystal molecule, and the pitch of cholesteric liquid epitaxial can be subject to the disturbance of gas and make a variation, if utilize the drift characteristic of the centre wavelength of spectral hand or right side wavelength location to analyze, be really difficult to utilize the spectral characteristic of cholesteric liquid crystal film to carry out accurate quantitative analysis for gas sensing behavior; Therefore novel, a simple analytical approach is proposed in the present invention, we by measured obtain through time penetrate/or the left side wavelength drift analysis of reflective band calculate cholesterol liquid crystal helical structure because of gas molecule and diffuse in cholesteric liquid crystal film the change causing pitch p.Therefore aforesaid gas detection method be can according to described through time spectrum change and calculate according to following formula further and obtain the pitch variable quantity of described cholesteric liquid epitaxial;
p(t)/p(0)＝λ
L(t)/λ
L(0)
Wherein, λ
lt () represents the left side wavelength of the spectral hand when time t; λ
l(0) the left side wavelength that cholesteric liquid crystal film is initial is represented.
Moreover, the data processing unit used in gas detecting system of the present invention be can according to described through time spectrum change and at least one that obtains in the out-of-service time of transient state spectral response, pitch change, spectral red shift phenomenon and described cholesteric liquid epitaxial; And judge according to this and the characteristic differentiating described gas to be measured.
In addition, the formation of gas detecting system of the present invention does not limit especially, and such as, as shown in Figure 1, gas detecting system 1 can be by sensing chamber 10, detect analytic unit 20, cholesteric liquid epitaxial P, data processing unit 30 and forming.
Specifically, gas detecting system of the present invention can be formation as shown in Figure 2, for example, such as, wherein can comprise probe 211, sensing chamber 10, gas sensing unit 40, gas TS to be measured, light source 50, detect analytic unit 20, optical spectrum analyser 210, data processing unit 30, processor 310, memory body 320, gas characteristic data bank 330, signal link LK.
In addition, gas detecting system provided by the present invention is the various gases, particularly organic gas that are applicable in testing environment.Namely, be applicable to the kind of the gas to be measured utilizing gas detecting system of the present invention to carry out detecting, do not limit especially; Such as, go for detecting at least can differentiate containing to be selected from by acetone, butanone, cyclohexanone, dimethylbenzene, normal heptane and combination thereof form the gas to be measured of at least one in group.
Further, according to another viewpoint other than the above, the present invention can provide a kind of gas detection method, comprise: provide a gas to be measured in a sensing chamber, described sensing chamber is configured with a transparency carrier, alignment film and be configured on described transparency carrier and is configured at cholesteric liquid epitaxial on described alignment film, and can accommodating gas to be measured; Detect described gas to be measured infiltrate in described cholesteric liquid epitaxial process through time spectrum change; According to described through time spectrum change, obtained by computing that pitch starts transformation period, pitch increase at least one in the out-of-service time of time of specific factor, cholesteric liquid epitaxial; And start transformation period, the pitch increase time of specific factor, the out-of-service time of cholesteric liquid epitaxial according to described pitch, judge and differentiate the characteristic of described gas to be measured.
Again, according to other viewpoints of the present invention, These gases detection system also can according to described through time spectrum change and calculate according to following formula further and obtain the pitch variable quantity of described cholesteric liquid epitaxial;
p(t)/p(0)＝λ
L(t)/λ
L(0)
Wherein, p represents the pitch of cholesteric liquid epitaxial, λ
lt () represents wavelength on the left of the spectral hand when time t, λ
l(0) initial left side wavelength is represented.
In addition, gas detection method provided by the present invention is the various gases, particularly organic gas that are applicable in testing environment.Namely, be applicable to the kind of the gas to be measured utilizing gas detection method of the present invention to carry out detecting, do not limit especially; Such as, go for detecting at least can differentiate containing to be selected from by acetone, butanone, cyclohexanone, dimethylbenzene, normal heptane and combination thereof form the gas to be measured of at least one in group.
In addition, the formation of gas detection method of the present invention does not limit especially, and such as, as shown in Figure 4, gas detection method can comprise provides a gas to be measured in a sensing chamber (step S110); Detect described gas to be measured infiltrate in described cholesteric liquid epitaxial process through time spectrum change curve (step S120); According to described through time spectrum change curve, obtained at least one (step S130) in the out-of-service time of pitch starts transformation period, pitch increases specific factor time, cholesteric liquid epitaxial by computing; And start transformation period according to described pitch, pitch increases the time of specific factor, the out-of-service time of cholesteric liquid epitaxial and judges and differentiate the characteristic (step S140) of described gas to be measured.
The invention relates to gas sensing unit, gas detecting system and gas detection method, particularly about a kind of gas detection cell comprising transparency carrier, alignment film and cholesteric liquid epitaxial; A kind of gas detecting system comprising described gas sensing unit, sensing chamber, detection analytic unit and data processing unit; And a kind of gas detection method using they.
(embodiment)
Object of the present invention, specific advantage and novel feature, can be more cheer and bright by the following detailed description relevant with additional drawing and preferred embodiment.
Below, preferred embodiment of the present invention is explained with reference to attached drawing.
Preparation example 1 " preparation of gas sensing unit 1 "
First, glass substrate (2 × 2.5cm is prepared
2) and carry out cleaning, drying.On described glass substrate, in rotary coating mode, coating polyimide solution (PI) heating cure, and then carry out rubbing by the roller of covered with nylon cloth, alignment film formation being had make Liquid Crystal Molecules Alignment direction certain; Then, scraper is utilized to scrape the cholesteric liquid crystal solution (cholesterol liquid crystal: 3N1-12A-550-5 of thickness about 5 μm at the glass substrate that orientation completes; Reflecting spectrum centre wavelength is ~ 550nm), so namely complete the preparation of gas sensing unit 1 (cholesterol liquid crystal sensing film).
" detection of organic gas molecule "
Embodiment 1
The gas sensing unit 1 (cholesterol liquid crystal sensing film) preparation example 1 obtained is placed in the sensing chamber 10 of gas detecting system of the present invention as shown in Figure 2, above sensing chamber, pin hole injects each sample organic solution (being respectively acetone soln, butanone solution, cyclohexanone solution, xylene solution, n-heptane solution, butanol solution) of 20 milliliters, make the gas of acetone, butanone, cyclohexanone, dimethylbenzene, normal heptane, normal butyl alcohol, naturally evaporate from described sample organic solution, and be full of in the closed environment of sensing chamber 10.Now, the distance between optical probe 211 and cholesteric liquid epitaxial is about about 1cm.Then, open light source 50, use the optical spectrum analyser 210 be equipped with in the detection analytic unit 20 of gas detecting system of the present invention, scope in wavelength 400-700nm carries out spectral scan, detect respectively by the gas to be measured evaporated in variant sample organic solution (i.e. acetone, butanone, cyclohexanone, dimethylbenzene, normal heptane, normal butyl alcohol) spread infiltrate in described cholesteric liquid epitaxial process through time spectrum change and obtain each gas to be measured through time spectrum change curve (with reference to Fig. 5 ~ Figure 10).
Then, utilize data processing unit 30, calculate according to following formula and obtain through time pitch change curve, by through time pitch change curve tries to achieve the initial time (second) of pitch displacement, pitch is increased to the time (second) of 1.2 times and the out-of-service time (second) of described cholesteric liquid epitaxial
p(t)/p(0)＝λ
L(t)/λ
L(0)
Wherein, λ
lt () represents the left side wavelength of the spectral hand when time t, λ
l(0) the left side wavelength that cholesteric liquid crystal film is initial is represented.
The pitch of above-mentioned obtained each organic gas is started the time (second) of change, pitch is increased to the time (second) of 1.2 times, out-of-service time (second) result of cholesteric liquid epitaxial is shown in table 1.
Table 1
Embodiment 2
The gas sensing unit 1 (cholesterol liquid crystal sensing film) preparation example 1 obtained is placed in the sensing chamber 10 of gas detecting system of the present invention as shown in Figure 2, above sensing chamber, pin hole injects each sample organic solution (being respectively the acetone soln of 20%, 30%, 40%, 50%, 60%, 70%, 80%) of 40 milliliters, make the gas of the acetone of variant concentration, naturally evaporate from described sample organic solution, and be full of in the closed environment of sensing chamber 10.Now, the distance between optical probe 211 and cholesteric liquid epitaxial is about about 1cm.Then, open light source 50, use the optical spectrum analyser 210 be equipped with in the detection analytic unit 20 of gas detecting system of the present invention, detect respectively by the gas to be measured (i.e. acetone) evaporated in variant sample organic solution infiltrate in described cholesteric liquid epitaxial process through time spectrum change.
Then, utilize data processing unit 30, according to described through time spectrum change and following formula calculate and obtain the initial time (second) of pitch displacement and the out-of-service time (second) of described cholesteric liquid epitaxial;
p(t)/p(0)＝λ
L(t)/λ
L(0)
Wherein, λ
lt () represents the left side wavelength of the spectral hand when time t, λ
l(0) the left side wavelength that cholesteric liquid crystal film is initial is represented.
Out-of-service time (second) result pitch of above-mentioned obtained each organic gas being started time (second) the cholesteric liquid epitaxial changed is shown in table 2.
Table 2
Embodiment 3
The gas sensing unit 1 (cholesterol liquid crystal sensing film) preparation example 1 obtained is placed in the sensing chamber 10 of gas detecting system of the present invention as shown in Figure 2, above sensing chamber, pin hole injects the organic solution to be detected of 20 milliliters, organic gas to be measured is evaporated sample organic solution naturally from described treating, and is full of in the closed environment of sensing chamber 10.Now, the distance between optical probe 211 and cholesteric liquid epitaxial is about about 1cm.Then, open light source 50, use the optical spectrum analyser 210 be equipped with in the detection analytic unit 20 of gas detecting system of the present invention, detect by the gas to be measured evaporated in organic solution to be detected infiltrate in described cholesteric liquid epitaxial process through time spectrum change curve.
Then, utilize data processing unit 30, and calculate according to following formula and obtain through time pitch change curve; According to described spectrum change curve map, through time pitch change curve try to achieve the start time (second) of the obvious displacement of pitch and the out-of-service time (second) of described cholesteric liquid epitaxial;
p(t)/p(0)＝λ
L(t)/λ
L(0)
Wherein, λ
lt () represents the left side wavelength of the spectral hand when time t, λ
l(0) the left side wavelength that cholesteric liquid crystal film is initial is represented.
The time that the time that pitch according to above-mentioned obtained organic gas to be measured starts to change is 215 seconds, pitch is increased to 1.2 times is 865 seconds, the out-of-service time of cholesteric liquid epitaxial is 923 seconds, and the known organic gas to be measured of the table of comparisons 1 is normal heptane.
Embodiment 4
Same operation will be carried out with embodiment 3, via utilize data processing unit 30 try to achieve start time (second) of the obvious displacement of pitch and described cholesteric liquid epitaxial confirm organic gas contained in solution be acetone organic solution A to be measured (hereinafter referred to as " acetone solution to be detected), further dilution specific factor, so carry out operation similarly to Example 2 and analysis, the time that the pitch that result obtains organic gas to be measured starts to change be 17 points 30 seconds, out-of-service time of cholesteric liquid epitaxial be 20 points 30 seconds, the table of comparisons 2 can know by inference in solution to be detected containing have an appointment 30% acetone.
Result shown in above-mentioned table 1, table 2, can confirm to utilize gas sensing unit of the present invention, gas detecting system and gas detection method, can obtain gas to be measured infiltrate in described cholesteric liquid epitaxial process through time spectrum change curve; And try to achieve according to this pitch start transformation period, pitch increase the time of specific factor, the out-of-service time of cholesteric liquid epitaxial, can detect, judge and differentiate the characteristic such as kind of described gas to be measured fast, and also can obtain described gas to be measured amount existing in the environment.
Above, although be explain the present invention based on specific embodiment, but described etc. be specifically describe the present invention, the present invention is not limited to this, usually knows that the knowledgeable can understand: the distortion in the thought of technology of the present invention and the possibility of improvement as long as have in described field.
Simple distortion of the present invention or any one in changing all belong to the field of the invention, and concrete protection domain of the present invention is become by additional patent Shen scope and made clear.
Claims (8)
1. a gas sensing unit, is characterized in that, comprising:
One transparency carrier;
One alignment film, it is configured on described transparency carrier; And
One cholesteric liquid epitaxial, it is configured on described alignment film, and can be infiltrated by gas to be measured.
2. gas detection cell as claimed in claim 1, it is characterized in that, cholesteric liquid epitaxial can be had an effect with gas to be measured.
3. a gas detecting system, is characterized in that, comprising:
One gas detection cell, it is configured with a transparency carrier, is configured at the alignment film on described transparency carrier and is configured at the cholesteric liquid epitaxial on described alignment film;
One sensing chamber, it can accommodating gas to be measured and have the space at least can placing described gas detect list;
One detects analytic unit, and it at least comprises an optical spectrum analyser, and it infiltrates spectrum change curve map in described cholesteric liquid epitaxial process in order to detect gas to be measured; And
One data processing unit, its can according to described through time spectrum change curve and obtain that pitch starts transformation period, pitch increases at least one in the out-of-service time of time of specific factor, cholesteric liquid epitaxial; And judge according to this and the characteristic differentiating described gas to be measured.
4. gas detecting system as claimed in claim 3, is characterized in that, can according to described through time spectrum change and calculate according to following formula further and obtain the pitch variable quantity of described cholesteric liquid epitaxial;
p(t)/p(0)＝λ
L(t)/λ
L(0)
Wherein, p represents the pitch of cholesteric liquid epitaxial; λ
lt () represents wavelength on the left of the spectral hand when time t; λ
l(0) initial left side wavelength is represented.
5. gas detecting system as claimed in claim 3, is characterized in that, at least can differentiating containing being selected from the gas to be measured being made up of at least one in group acetone, butanone, cyclohexanone, dimethylbenzene, normal heptane and combination thereof.
6. a gas detection method, is characterized in that, comprising:
There is provided a gas to be measured in a sensing chamber, described sensing chamber is configured with a transparency carrier, alignment film and be configured on described transparency carrier and is configured at cholesteric liquid epitaxial on described alignment film, and can accommodating gas to be measured;
Detect described gas to be measured infiltrate in described cholesteric liquid epitaxial process through time spectrum change curve;
According to described through time spectrum change curve, obtained at least one in the out-of-service time of pitch starts transformation period, pitch increases specific factor time, cholesteric liquid epitaxial by computing; And
Start transformation period according to described pitch, pitch increases the time of specific factor and/or the out-of-service time of cholesteric liquid epitaxial, judge and differentiate the characteristic of described gas to be measured.
7. gas detection method as claimed in claim 6, is characterized in that, can according to described through time spectrum change and calculate according to following formula further and obtain the pitch variable quantity of described cholesteric liquid epitaxial;
p(t)/p(0)＝λ
L(t)/λ
L(0)
Wherein, p represents the pitch of cholesteric liquid epitaxial, λ
lt () represents wavelength on the left of the spectral hand when time t; λ
l(0) initial left side wavelength is represented.
8. gas detection method as claimed in claim 6, is characterized in that, at least can differentiate containing to be selected from by acetone, butanone, cyclohexanone, dimethylbenzene, normal heptane and combination thereof form the gas to be measured of at least one in group.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110849846A (en) * | 2018-08-21 | 2020-02-28 | 江苏集萃智能液晶科技有限公司 | Method and system for detecting concentration of gaseous compound based on polymer dispersed liquid crystal |
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| TW201227006A (en) * | 2010-12-29 | 2012-07-01 | Ind Tech Res Inst | Broadband cholesteric liquid crystal film, method for fabricating the same, polarization device employing the same, and high light efficiency liquid crystal display employing the same |
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| JPH06323989A (en) * | 1993-05-14 | 1994-11-25 | Takaoka Electric Mfg Co Ltd | Optical gas detector |
| WO1997021098A1 (en) * | 1995-12-05 | 1997-06-12 | Hoechst Industry Limited | Optical fuel vapor detector utilizing thin polymer film and fuel leak monitor system |
| CN1858641A (en) * | 2005-05-08 | 2006-11-08 | 财团法人工业技术研究院 | Full coated high pentration type brightening optical module suitable for liquid crystal display |
| TW201227006A (en) * | 2010-12-29 | 2012-07-01 | Ind Tech Res Inst | Broadband cholesteric liquid crystal film, method for fabricating the same, polarization device employing the same, and high light efficiency liquid crystal display employing the same |
| TW201313881A (en) * | 2011-09-26 | 2013-04-01 | Ind Tech Res Inst | Liquid crystal gas sensor cell and the use thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110849846A (en) * | 2018-08-21 | 2020-02-28 | 江苏集萃智能液晶科技有限公司 | Method and system for detecting concentration of gaseous compound based on polymer dispersed liquid crystal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105223138B (en) | 2018-01-30 |
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