CN105223138B - 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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- CN105223138B CN105223138B CN201410248200.9A CN201410248200A CN105223138B CN 105223138 B CN105223138 B CN 105223138B CN 201410248200 A CN201410248200 A CN 201410248200A CN 105223138 B CN105223138 B CN 105223138B
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Abstract
A kind of gas detecting system, it is to include a gas detection cell, and it is configured with a transparency carrier, the alignment film being configured on the transparency carrier and the cholesteric liquid epitaxial being configured on the alignment film；One sensing chamber, it can house under test gas and with the space that can at least place the gas detection cell；One detection and analysis unit, it comprises at least an optical spectrum analyser, its to detect in the under test gas infiltration cholesteric liquid epitaxial process through when spectrum change；And a data processing unit, its can according to it is described through when spectrum change and obtain at least one of out-of-service time of transient state spectral response, pitch change, spectral red shift phenomenon and the cholesteric liquid epitaxial；And the characteristic with differentiating the under test gas is judged according to this.
Description
Technical field
The present invention is on gas sensing unit, gas detecting system and gas detection method, is wrapped especially with regard to one kind
Include the gas detection cell of transparency carrier, alignment film and cholesteric liquid epitaxial；One kind includes the gas sensing unit, detection
The gas detecting system of room, detection and analysis unit and data processing unit；A kind of and gas detection method using they.
Background technology
In general, most of organic gas industrially, used in laboratory and medical space is all waved with height
Hair property, harmfulness and contaminative, when the situation that personnel are exposed in the environment for a long time, then organic gas is easy for via exhaling
Inhale road, epidermis even orally to enter in human body, so that unexpected harm is produced for human body, except that may cause when serious
Beyond cancer, or even human organ and nervous system failure can be caused.Furthermore because the organic gas of majority all has inflammability,
High explosive mixture is easily formed in air, in addition to meeting harmful to human and environment, and ecology can be influenceed.Therefore, consider
Health and Environmental security factor, the organic gas in the presence of monitoring of environmental is very important.
It is that gaseous sample is delivered into assay laboratory mostly in the assay method of organic gas in detecting environment, to change
Learn or gas color spectrum is tested and examined, so that it is determined that the composition and concentration of organic gas.Due to from transport sample to
To testing result there is time delay, even if based on gas phase coloured light spectrometer and infra-red sepectrometry, the detection method tool of electrochemistry
There are certain precision and sensitivity, the instant testing result of high reliability is obtained to so far, there is no method.
So as to which, all circles all look forward to developing a kind of low cost, quick detection and can have high sensitivity, precision and can concurrently
By spending high gas sensing unit, gas detecting system and gas detection method.
The content of the invention
In view of this, the present inventor etc. are furtherd investigate for above-mentioned problem, are found transparent by using being configured with one
The gas of substrate, the alignment film being configured on the transparency carrier and the cholesteric liquid epitaxial being configured on the alignment film
Body detection unit, use a kind of gas detecting system and its gas detection method at least containing These gases unit, you can with
Reach low cost, quick detection and high sensitivity, precision and the high target of reliability can be had concurrently, at least complete the present invention.
It is, according to the first viewpoint of the present invention, a gas sensing unit can be provided, including：One transparency carrier；One
Alignment film, it is configured on the transparency carrier；And a cholesteric liquid epitaxial, it is configured on the alignment film, and energy
Enough penetrated into by under test gas.In These gases detection unit, the cholesteric liquid epitaxial can also occur with test gas
Effect.
Besides, according to other viewpoints of the present invention, a kind of gas detecting system can be provided, including：One gas is examined
Unit is surveyed, it is configured with a transparency carrier, the alignment film that is configured on the transparency carrier and is configured on the alignment film
A cholesteric liquid epitaxial；One sensing chamber, it can house under test gas and the sky single with can at least place the gas detection
Between；One detection and analysis unit, it comprises at least an optical spectrum analyser, and it penetrates into the cholesterol liquid crystal to detect under test gas
In membrane process through when spectrum change；And a data processing unit, its can according to it is described through when spectrum change and obtain pitch
Start at least one of out-of-service time of transformation period, the time of pitch increase specific factor, cholesteric liquid epitaxial；And according to this
Judge the characteristic with differentiating the under test gas.
Wherein, can according to it is described through when spectrum change and according further to following formula calculate and obtain the cholesteric liquid epitaxial
Pitch variable quantity；
P (t)/p (0)=λL(t)/λL(0)
Wherein, p represents the pitch of cholesteric liquid epitaxial；λL(t) wavelength on the left of the spectral hand in time t is represented；λL
(0) initial left side wavelength is represented.
Wherein, can at least differentiate containing selected from by acetone, butanone, cyclohexanone, dimethylbenzene, normal heptane and combinations thereof structure
Into the under test gas of at least one of group.
Further, according to the other viewpoint of the present invention, a kind of gas detection method can be provided, including：There is provided one
Under test gas in a sensing chamber, the sensing chamber be configured with a transparency carrier, one be configured at alignment film on the transparency carrier,
And one be configured at cholesteric liquid epitaxial on the alignment film, and under test gas can be housed；Detect the under test gas and penetrate into institute
State in cholesteric liquid epitaxial process through when spectrum change curve；According to it is described through when spectrum change curve, pass through computing
And obtain in the out-of-service time that pitch starts transformation period, the time of pitch increase specific factor, cholesteric liquid epitaxial at least
One；And start the mistake of transformation period, the time of pitch increase specific factor and/or cholesteric liquid epitaxial according to the pitch
The time is imitated, to judge and differentiate the characteristic of the under test gas.
Wherein, can according to it is described through when spectrum change and according further to following formula calculate and obtain the cholesteric liquid epitaxial
Pitch variable quantity；
P (t)/p (0)=λL(t)/λL(0)
Wherein, p represents the pitch of cholesteric liquid epitaxial, λL(t) wavelength on the left of the spectral hand in time t is represented；λL
(0) initial left side wavelength is represented.
Wherein, can at least differentiate containing selected from by acetone, butanone, cyclohexanone, dimethylbenzene, normal heptane and combinations thereof structure
Into the under test gas of at least one of group.
Brief description of the drawings
Fig. 1 is the block diagram for the embodiment for showing the gas detecting system according to the present invention.
Fig. 2 is the schematic diagram for the embodiment for showing the gas detecting system according to the present invention.
Fig. 3 is the profile for the embodiment for showing gas sensor.
Fig. 4 is the flow chart for the embodiment for showing the gas detection method according to the present invention.
Fig. 5 be show obtained by the cholesteric liquid crystal film detection acetone gas according to the present invention through when spectrum change it is bent
Line chart.
Fig. 6 be show obtained by the cholesteric liquid crystal film detection butanone gas according to the present invention through when spectrum change it is bent
Line chart.
Fig. 7 be show according to the present invention cholesteric liquid crystal film detection cyclohexanone gas obtained by through when spectrum change
Curve map.
Fig. 8 be show according to the present invention cholesteric liquid crystal film detection diformazan benzene gas obtained by through when spectrum change
Curve map.
Fig. 9 be show according to the present invention cholesteric liquid crystal film detection normal heptane gas obtained by through when spectrum change
Curve map.
Figure 10 be show according to the present invention cholesteric liquid crystal film detection n-butanol gas obtained by through when spectrum become
Change curve map.
Symbol description：
TS under test gas
LK signals link
S110 steps
S120 steps
S130 steps
S140 steps
P cholesteric liquid epitaxials
1 gas detecting system
10 sensing chamber
20 detection and analysis units
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
Spectrum change curve initial on acetone gas A1
A2 to A10 on acetone gas, 30 seconds, 60 seconds, 90 seconds, 120 seconds, 150 seconds, 180 seconds, 210 seconds, 240 seconds,
Spectrum change curve at 273 seconds
Spectrum change curve initial on butanone gas B1
B2 to B13 on butanone gas, 31 seconds, 73 seconds, 93 seconds, 113 seconds, 137 seconds, 157 seconds, 177 seconds, 198 seconds,
Spectrum change curve at 219 seconds, 235 seconds, 249 seconds, 260 seconds
Spectrum change curve initial on cyclohexanone gas C1
C2 to C11 on cyclohexanone gas, 42 seconds, 72 seconds, 92 seconds, 117 seconds, 138 seconds, 157 seconds, 177 seconds, 202 seconds,
Spectrum change curve at 231 seconds, 246 seconds
Spectrum change curve initial on diformazan benzene gas D1
D2 to D11 on diformazan benzene gas, 30 seconds, 72 seconds, 116 seconds, 154 seconds, 181 seconds, 218 seconds, 254 seconds, 283
Spectrum change curve when second, 307 seconds, 332 seconds
Spectrum change curve initial on normal heptane gas E1
E2 to E11 on normal heptane gas, 231 seconds, 321 seconds, 415 seconds, 495 seconds, 576 seconds, 657 seconds, 737 seconds, 837
Spectrum change curve when second, 900 seconds, 934 seconds
Spectrum change curve initial on n-butanol gas F1
F2 to F11 on n-butanol gas, 110 seconds, 220 seconds, 331 seconds, 421 seconds, 506 seconds, 589 seconds, 632 seconds, 674
Spectrum change curve during 686 seconds, 697 seconds second
Embodiment
It is understandable to become apparent above-mentioned various aspects of the invention, below, it will more enter one by accompanying drawing, embodiment
Step ground describes the present invention in detail.
In this manual, it is noted that：The border of the cross reference number added in the inscape of each drawing, as long as it is same
Inscape, even if being shown on different drawings and adding same number as much as possible.
The gas sensing unit of the present invention, including：One transparency carrier；One alignment film, its be configured at the transparency carrier it
On；And a cholesteric liquid epitaxial, it is configured on the alignment film, and can be penetrated into by under test gas.In These gases
In detection unit, the cholesteric liquid epitaxial can also have an effect with test gas.
It is as long as and not particularly restricted also, be used in substrate of the transparency carrier of the present invention with the transparency.Example
Such as, the high glass substrate of the transparency, plastic substrate etc. can be used.
Furthermore as long as being used in film of the alignment film with horizontal direction matching function of the present invention, do not limit especially
System.It is, for example, possible to use by being coated with pi solution (PI) and the film that is solidified of heating up.
As long as in addition, it is used in cholesteric liquid epitaxial of the cholesteric liquid epitaxial suitable for detection organic gas of the present invention
, and it is not particularly restricted.It is, for example, possible to use by by commercially available cholesteric liquid crystal solution (3N1-12A-550-5)
The cholesterol liquid film that coating solidification forms.
Also, cholesteric liquid epitaxial, in addition to allowing for being penetrated into by under test gas, preferably for also can with it is to be measured
Gas is had an effect.
Furthermore the configuration composition of gas sensing unit of the invention is simultaneously not particularly restricted, for example, as shown in figure 3, gas sense
Survey unit 40 can be sequentially configure glass substrate 410, alignment film 420, cholesteric liquid epitaxial P and form.
In addition, gas detection cell provided by the present invention applies to detect the various gases in environment, particularly have
Machine gas.It is, the species of the under test gas detected suitable for the gas detection cell using the present invention, not especially
Limitation；For example, going for detection can at least differentiate containing selected from by acetone, butanone, cyclohexanone, dimethylbenzene, positive heptan
Alkane and combinations thereof forms the under test gas of at least one of group.
In addition, gas detecting system provided by the present invention, including a gas detection cell, it is configured with a transparent base
Plate, the alignment film being configured on the transparency carrier and the cholesteric liquid epitaxial being configured on the alignment film；One detection
Room, it can house under test gas and the space single with can at least place the gas detection；One detection and analysis unit, it is at least
Including an optical spectrum analyser, its to detect under test gas penetrate into the cholesteric liquid epitaxial process through when spectrum change it is bent
Line chart；And a data processing unit, its can according to it is described through when spectrum change curve and obtain pitch start transformation period,
At least one of the time of pitch increase specific factor, the out-of-service time of cholesteric liquid epitaxial；And judge according to this with differentiating institute
State the characteristic of under test gas.
Also, the sensing chamber and not particularly restricted used in the gas detecting system of the present invention, as long as with accommodating
Space.From the point of view of precision viewpoint is detected, sensing chamber is preferably confined space.
Secondly, the transparency carrier and not particularly restricted used in the gas detecting system of the present invention, as long as have
The substrate of the transparency.It is, for example, possible to use transparent high glass substrate, plastic substrate etc..
Furthermore the present invention gas detecting system used in alignment film, as long as and it is not particularly restricted have match somebody with somebody
To the film of function.It is, for example, possible to use it is subject to solidification by rotary coating pi solution (PI) and heating and forms
Film.
In addition, the cholesteric liquid epitaxial used in the gas detecting system of the present invention, and it is not particularly restricted, as long as
Cholesteric liquid epitaxial suitable for detecting organic gas.It is, for example, possible to use by by commercially available cholesterol liquid crystal
The cholesteric liquid epitaxial that solution (3N1-12A-550-5) coating forms.Also, cholesteric liquid epitaxial, except allowing for be to be measured
Beyond gas penetrates into, preferably for that can be had an effect with test gas.
In addition, the detection and analysis unit used in the gas detecting system of the present invention is to comprise at least a spectrum analysis
Device.The optical spectrum analyser is simultaneously not particularly restricted, as long as the optical of under test gas, cholesteric liquid epitaxial etc. can be tested and analyzed
Qualitative change.For example, the detection and analysis unit used in the gas detecting system of the present invention is can at least to detect to treat
Survey gas penetrate into the cholesteric liquid epitaxial process through when spectrum change curve.
Also, according to other viewpoints of the present invention, due to the penetrating of cholesteric liquid crystal film/or the left side of reflective band
The wavelength of band and right edge band is respectively λL=nop、λR=neP, wherein λLWith λRWavelength and the right side on the left of spectral hand are represented respectively
Side wavelength location；n0、neLiquid crystal ordinary refraction index, abnormal optical index are represented respectively, and p represents the pitch of cholesteric liquid epitaxial.
Due to abnormal optical index neIt can change with the ordered state of liquid crystal molecule, and the pitch of cholesteric liquid epitaxial can be by
The disturbance of gas and make a variation, if being analyzed using the centre wavelength of spectral hand or the drift characteristic of right side wavelength location,
The tangible spectral characteristic for being difficult by cholesteric liquid crystal film carries out accurate quantitative analysis to be directed to gas sensing behavior；Therefore
A novel, simple analysis method is proposed in the present invention, we by it is measured obtain through when penetrate/or reflective band
Left side wavelength drift is analyzed cholesterol liquid crystal helical structure is calculated because gas molecule is diffused into cholesteric liquid crystal film
And cause pitch p change.Therefore foregoing gas detection method be can according to it is described through when spectrum change and according further to
Following formula calculates and obtains the pitch variable quantity of the cholesteric liquid epitaxial；
P (t)/p (0)=λL(t)/λL(0)
Wherein, λL(t) the left side wavelength of the spectral hand in time t is represented；λL(0) at the beginning of representing cholesteric liquid crystal film
The left side wavelength of beginning.
Furthermore the data processing unit used in the gas detecting system of the present invention is can be according to described through the time
Spectrum changes and obtained in the out-of-service time of transient state spectral response, pitch change, spectral red shift phenomenon and the cholesteric liquid epitaxial
At least one；And the characteristic with differentiating the under test gas is judged according to this.
In addition, the composition of gas detecting system of the present invention and not particularly restricted, for example, as shown in figure 1, gas detection system
System 1 can be by sensing chamber 10, detection and analysis unit 20, cholesteric liquid epitaxial P, data processing unit 30 and form.
Specifically, gas detecting system of the invention can be composition as shown in Figure 2, for example, for example, wherein
Probe 211, sensing chamber 10, gas sensing unit 40, under test gas TS, light source 50, detection and analysis unit 20, spectrum can be included
Analyzer 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 applies to detect the various gases in environment, particularly have
Machine gas.It is, the species of the under test gas detected suitable for the gas detecting system using the present invention, not especially
Limitation；For example, going for detection can at least differentiate containing selected from by acetone, butanone, cyclohexanone, dimethylbenzene, positive heptan
Alkane and combinations thereof forms the under test gas of at least one of group.
Further, according to another viewpoint other than the above, the present invention can provide a kind of gas detection method, bag
Include：A under test gas is provided in a sensing chamber, the sensing chamber is configured with a transparency carrier, one is configured on the transparency carrier
Alignment film and one be configured at cholesteric liquid epitaxial on the alignment film, and under test gas can be housed；Detect the gas to be measured
Body penetrate into the cholesteric liquid epitaxial process through when spectrum change；According to it is described through when spectrum change, by computing and
Start at least one of out-of-service time of transformation period, the time of pitch increase specific factor, cholesteric liquid epitaxial to pitch；
And start the out-of-service time of transformation period, the time of pitch increase specific factor, cholesteric liquid epitaxial according to the pitch, to sentence
Characteristic that is disconnected and differentiating the under test gas.
Also, according to the present invention other viewpoints, These gases detecting system can also according to it is described through when spectrum change
And calculated according further to following formula and obtain the pitch variable quantity of the cholesteric liquid epitaxial；
P (t)/p (0)=λL(t)/λL(0)
Wherein, p represents the pitch of cholesteric liquid epitaxial, λL(t) wavelength on the left of the spectral hand in time t, λ are representedL
(0) initial left side wavelength is represented.
In addition, gas detection method provided by the present invention applies to detect the various gases in environment, particularly have
Machine gas.It is, the species of the under test gas detected suitable for the gas detection method using the present invention, not especially
Limitation；For example, going for detection can at least differentiate containing selected from by acetone, butanone, cyclohexanone, dimethylbenzene, positive heptan
Alkane and combinations thereof forms the under test gas of at least one of group.
In addition, the composition of gas detection method of the present invention and not particularly restricted, for example, as shown in figure 4, gas detection side
Method can include providing a under test gas in a sensing chamber (step S110)；Detect the under test gas and penetrate into the cholesteric liquid
In epitaxial process through when spectrum change curve (step S120)；According to it is described through when spectrum change curve, pass through computing
And obtain in the out-of-service time that pitch starts transformation period, the time of pitch increase specific factor, cholesteric liquid epitaxial at least
One (step S130)；And start transformation period, the time of pitch increase specific factor, cholesteric liquid epitaxial according to the pitch
Out-of-service time come the characteristic (step S140) that judges and differentiate the under test gas.
The present invention is on gas sensing unit, gas detecting system and gas detection method, is wrapped especially with regard to one kind
Include the gas detection cell of transparency carrier, alignment film and cholesteric liquid epitaxial；One kind includes the gas sensing unit, detection
The gas detecting system of room, detection and analysis unit and data processing unit；A kind of and gas detection method using they.
(embodiment)
The purpose of the present invention, it is specific the advantages of and novel feature, can be by following relevant with additional drawing detailed
Illustrate and preferred embodiment and it is more cheer and bright.
Hereinafter, presently preferred embodiments of the present invention is explained with reference to attached drawing.
Preparation example 1《The preparation of gas sensing unit 1》
First, glass substrate (2 × 2.5cm is prepared2) and carry out cleaning, drying.On the glass substrate, applied with rotating
Mode for cloth, coating polyimide solution (PI) and heating cure, are then oriented friction by coating the roller of nylon cloth again,
Make to be formed to have and make the certain alignment film in Liquid Crystal Molecules Alignment direction；Then, scraped using scraper in the glass substrate that orientation is completed
Cholesteric liquid crystal solution (the cholesterol liquid crystal that about 5 μm of upper thickness：3N1-12A-550-5；Reflecting spectrum centre wavelength for~
550nm), the preparation of gas sensing unit 1 (cholesterol liquid crystal sensing film) is so completed.
《The detection of organic gas molecule》
Embodiment 1
Gas sensing unit 1 (cholesterol liquid crystal sensing film) obtained by preparation example 1 is placed in the present invention as shown in Figure 2
Gas detecting system sensing chamber 10 in, above sensing chamber at pin hole inject 20 milliliters each sample organic solution (respectively
For acetone soln, butanone solution, cyclohexanone solution, xylene solution, n-heptane solution, butanol solution), make acetone, butanone,
Cyclohexanone, dimethylbenzene, normal heptane, the gas of n-butanol, evaporate, and be full of in inspection naturally from the sample organic solution
Survey in the closed environment of room 10.Now, the distance between optical probe 211 and cholesteric liquid epitaxial are about 1cm or so.Then,
Light source 50 is opened, uses optical spectrum analyser 210, Yu Bo provisioned in the detection and analysis unit 20 of gas detecting system of the present invention
Long 400-700nm scope carries out spectral scan, detects respectively to be measured by being evaporated in variant sample organic solution
Gas (i.e. acetone, butanone, cyclohexanone, dimethylbenzene, normal heptane, n-butanol) diffusion is penetrated into the cholesteric liquid epitaxial process
Through when spectrum change and obtain each under test gas through when spectrum change curve (5~Figure 10 of reference picture).
Then, using data processing unit 30, according to following formula calculate and obtain through when pitch change curve, pass through through when
Initial time (second), the pitch that pitch change curve tries to achieve pitch displacement are increased to 1.2 times of time (second) and the courage is consolidated
The out-of-service time (second) of alcohol liquid crystal film
P (t)/p (0)=λL(t)/λL(0)
Wherein, λL(t) the left side wavelength of the spectral hand in time t, λ are representedL(0) at the beginning of representing cholesteric liquid crystal film
The left side wavelength of beginning.
By the pitch of above-mentioned resulting each organic gas start change time (second), pitch be increased to 1.2 times when
Between (second), out-of-service time (second) result of cholesteric liquid epitaxial be shown in table 1.
Table 1
Embodiment 2
Gas sensing unit 1 (cholesterol liquid crystal sensing film) obtained by preparation example 1 is placed in the present invention as shown in Figure 2
Gas detecting system sensing chamber 10 in, above sensing chamber at pin hole inject 40 milliliters each sample organic solution (respectively
Acetone soln for 20%, 30%, 40%, 50%, 60%, 70%, 80%), make the gas of the acetone of variant concentration, from institute
State and evaporated naturally in sample organic solution, and be full of in the closed environment of sensing chamber 10.Now, the He of optical probe 211
The distance between cholesteric liquid epitaxial is about 1cm or so.Then, light source 50 is opened, uses the inspection of gas detecting system of the present invention
Optical spectrum analyser 210 provisioned in analytic unit 20 is surveyed, is detected respectively by being evaporated in variant sample organic solution
Under test gas (i.e. acetone) penetrate into the cholesteric liquid epitaxial process through when spectrum change.
Then, using data processing unit 30, according to it is described through when spectrum change calculated with following formula and obtain pitch displacement
Initial time (second) and the cholesteric liquid epitaxial out-of-service time (second)；
P (t)/p (0)=λL(t)/λL(0)
Wherein, λL(t) the left side wavelength of the spectral hand in time t, λ are representedL(0) at the beginning of representing cholesteric liquid crystal film
The left side wavelength of beginning.
When the pitch of above-mentioned resulting each organic gas to be started to the failure of time (second) cholesteric liquid epitaxial of change
Between (second) result be shown in table 2.
Table 2
Embodiment 3
Gas sensing unit 1 (cholesterol liquid crystal sensing film) obtained by preparation example 1 is placed in the present invention as shown in Figure 2
Gas detecting system sensing chamber 10 in, 20 milliliters of organic solution to be detected is injected at pin hole above sensing chamber, makes to treat
Survey organic gas to treat to evaporate naturally in sample organic solution from described, and be full of in the closed environment of sensing chamber 10.This
When, the distance between optical probe 211 and cholesteric liquid epitaxial are about 1cm or so.Then, light source 50 is opened, uses the present invention
Provisioned optical spectrum analyser 210, is detected by institute in organic solution to be detected in the detection and analysis unit 20 of gas detecting system
The under test gas that evaporates penetrate into the cholesteric liquid epitaxial process through when spectrum change curve.
Then, using data processing unit 30, and according to following formula calculate and obtain through when pitch change curve；According to institute
State spectrum change curve map, through when pitch change curve try to achieve at the beginning of the obvious displacement of pitch between (second) and the cholesterol
The out-of-service time (second) of liquid crystal film；
P (t)/p (0)=λL(t)/λL(0)
Wherein, λL(t) the left side wavelength of the spectral hand in time t, λ are representedL(0) at the beginning of representing cholesteric liquid crystal film
The left side wavelength of beginning.
Pitch according to above-mentioned resulting organic gas to be measured start change time for 215 seconds, pitch be increased to 1.2
Times time be 865 seconds, the out-of-service time of cholesteric liquid epitaxial be 923 seconds, the table of comparisons 1 understand organic gas to be measured be positive heptan
Alkane.
Embodiment 4
Same operation will be carried out with embodiment 3, via the beginning that the obvious displacement of pitch is tried to achieve using data processing unit 30
Time (second) and the cholesteric liquid epitaxial confirm that organic gas contained in solution is (following for the organic solution A to be measured of acetone
Referred to as " acetone solution to be detected), specific factor is further diluted, so carries out operation and analysis similarly to Example 2, as a result
Obtain organic gas to be measured pitch start change time be 17 points 30 seconds, the out-of-service time of cholesteric liquid epitaxial be 20 point 30
Second, the table of comparisons 2 can be deduced in solution to be detected containing about 30% acetone.
Result shown in above-mentioned table 1, table 2, can confirm that using the present invention gas sensing unit, gas detecting system and
Gas detection method, can obtain under test gas penetrate into the cholesteric liquid epitaxial process through when spectrum change curve；And
Pitch is tried to achieve according to this starts transformation period, time, the out-of-service time of cholesteric liquid epitaxial of pitch increase specific factor, can be fast
The characteristics such as speed detection, the species for judging and differentiating the under test gas, and can also obtain under test gas institute in the environment
Existing amount.
More than, although explaining the present invention based on specific embodiment, but described etc. is to specifically
Illustrating the present invention, the present invention is not limited to this, as long as can be bright with the usual skill in the field
In vain：The possibility of deformation and improvement in the thought of the technology of the present invention.
Any one of simple deformation or change of the present invention belong to the field of the invention, and the present invention's is specific
Protection domain become to make clear by additional patent Shen scope.
Claims (8)
- A kind of 1. gas detecting system, it is characterised in that including：One gas detection cell, it is configured with a transparency carrier, the alignment film that is configured on the transparency carrier and is configured at A cholesteric liquid epitaxial on the alignment film；One sensing chamber, it can house under test gas and the space single with can at least place the gas detection；One detection and analysis unit, it comprises at least an optical spectrum analyser, and it penetrates into the cholesteric liquid to detect under test gas In epitaxial process through when spectrum change curve；AndOne data processing unit, its can according to it is described through when spectrum change curve and obtain pitch and start transformation period, spiral shell At least one of out-of-service time of time, cholesteric liquid epitaxial away from increase specific factor；And described in judgement according to this and discriminating The characteristic of under test gas.
- 2. gas detecting system as claimed in claim 1, it is characterised in that can according to it is described through when spectrum change and it is further Calculated according to following formula and obtain the pitch variable quantity of the cholesteric liquid epitaxial；P (t)/p (0)=λL(t)/λL(0)Wherein, p represents the pitch of cholesteric liquid epitaxial；λL(t) wavelength on the left of the spectral hand in time t is represented；λL(0) table Show initial left side wavelength.
- 3. gas detecting system as claimed in claim 1, it is characterised in that can at least differentiate containing selected from by acetone, Butanone, cyclohexanone, dimethylbenzene, normal heptane and combinations thereof form the under test gas of at least one of group.
- 4. gas detecting system as claimed in claim 1 or 2, it is characterised in that the data processing unit is according to obtained by Pitch start transformation period, pitch increase specific factor time and cholesteric liquid epitaxial out-of-service time, to judge and reflect The characteristic of not described under test gas.
- A kind of 5. gas detection method, it is characterised in that including：A under test gas is provided in a sensing chamber, the sensing chamber is configured with a transparency carrier, one is configured at the transparency carrier On alignment film and one be configured at cholesteric liquid epitaxial on the alignment film, and under test gas can be housed；Detect the under test gas penetrate into the cholesteric liquid epitaxial process through when spectrum change curve；According to it is described through when spectrum change curve, by data processing unit come computing and obtain pitch start transformation period, At least one of the time of pitch increase specific factor, the out-of-service time of cholesteric liquid epitaxial；AndWhen starting the failure of transformation period, the time of pitch increase specific factor and/or cholesteric liquid epitaxial according to the pitch Between, judge and differentiate the characteristic of the under test gas by the data processing unit.
- 6. gas detection method as claimed in claim 5, it is characterised in that can according to it is described through when spectrum change and it is further Calculated according to following formula and obtain the pitch variable quantity of the cholesteric liquid epitaxial；P (t)/p (0)=λL(t)/λL(0)Wherein, p represents the pitch of cholesteric liquid epitaxial, λL(t) wavelength on the left of the spectral hand in time t is represented；λL(0) table Show initial left side wavelength.
- 7. gas detection method as claimed in claim 5, it is characterised in that can at least differentiate containing selected from by acetone, Butanone, cyclohexanone, dimethylbenzene, normal heptane and combinations thereof form the under test gas of at least one of group.
- 8. the gas detection method as described in claim 5 or 6, it is characterised in that in the judgement and differentiate the gas to be measured In the step of characteristic of body, the data processing unit starts transformation period according to resulting pitch, pitch increases specific times Several time and the out-of-service time of cholesteric liquid epitaxial, to judge and differentiate the characteristic of the under test gas.
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| 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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| JPH06323989A (en) * | 1993-05-14 | 1994-11-25 | Takaoka Electric Mfg Co Ltd | Optical gas detector |
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|---|---|---|---|---|
| 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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