TW201546439A - Gas sensor unit, gas detection system, and gas detection method - Google Patents
Gas sensor unit, gas detection system, and gas detection method Download PDFInfo
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本發明係關於氣體感測單元、氣體檢測系統及氣體檢測方法，特別是關於一種包括透明基板、配向膜及膽固醇液晶膜之氣體檢測單元；一種包括該氣體感測單元、檢測室、檢測分析單元、及資料處理單元之氣體檢測系統；以及一種使用彼等之氣體檢測方法。 The present invention relates to a gas sensing unit, a gas detecting system, and a gas detecting method, and more particularly to a gas detecting unit including a transparent substrate, an alignment film, and a cholesteric liquid crystal film; and the gas sensing unit, the detecting chamber, and the detecting and analyzing unit And a gas detection system for the data processing unit; and a gas detection method using the same.
一般而言，在工業上、實驗室及醫療場所中所使用的有機氣體大多數皆具有高揮發性、有害性及污染性，當人員長時間暴露在該環境中的情況，則有機氣體就容易經由呼吸道、表皮甚至經口而進入人體中，以致對於人體產生意想不到的危害，嚴重時除了可能致癌以外，甚至會造成人體器官和神經系統衰竭。再者，由於多數的有機氣體皆具有易燃性，空氣中易形成高爆炸性混合物，除了會危害人體及環境以外，並且會影響生態。因此，考量人體健康及環境安全因素，監測環境中所存在的有機氣體是非常重要的。 In general, most of the organic gases used in industrial, laboratory and medical settings are highly volatile, harmful and polluting. When people are exposed to the environment for a long time, organic gases are easy. It enters the human body through the respiratory tract, the epidermis and even the oral cavity, so that it has an unexpected harm to the human body. In severe cases, in addition to causing cancer, it may even cause human organs and nervous system failure. Furthermore, since most organic gases are flammable, it is easy to form a highly explosive mixture in the air, which will not only harm the human body and the environment, but also affect the ecology. Therefore, it is very important to monitor the presence of organic gases in the environment, taking into account human health and environmental safety factors.
在檢測環境中有機氣體的測定方法中，多半是將氣體樣品送至分析實驗室，以化學或氣體色光譜進行測試及檢驗，藉以確定有機氣體之成分及濃度。由於從運送樣品到得到檢測結果存在著時間延遲，即使基於氣相色光譜儀和紅外光譜法、電化學之檢測方法具有一定的精準度和靈敏度，至目前為止，尚無法 得到高信賴度的即時檢測結果。 In the detection method of organic gases in the detection environment, most of the gas samples are sent to an analytical laboratory for testing and testing by chemical or gas color spectroscopy to determine the composition and concentration of the organic gases. Due to the time delay from the delivery of the sample to the detection results, even the gas chromatography based spectrometer and infrared spectroscopy, electrochemical detection methods have certain accuracy and sensitivity, so far, it is not possible Get high-reliability instant detection results.
從而，各界皆盼望發展出一種低成本、能夠快速檢測並兼具高靈敏度、精準度和可靠度高的氣體感測單元、氣體檢測系統與氣體檢測方法。 Therefore, all walks of life are looking forward to the development of a low-cost, fast-detecting gas sensing unit, gas detection system and gas detection method with high sensitivity, accuracy and reliability.
有鑑於此，本發明人等乃針對上述課題加以深入研究，發現藉由使用配置有一透明基板、配置於該透明基板上之一配向膜、及配置於該配向膜上之一膽固醇液晶膜的氣體檢測單元、使用一種至少含有前述氣體單元之氣體檢測系統及其氣體檢測方法，即可以達成低成本、能夠快速檢測並兼具高靈敏度、精準度和可靠度高之目標，至少乃完成本發明。 In view of the above, the present inventors have intensively studied the above problems and found that a gas disposed on a transparent substrate, an alignment film disposed on the transparent substrate, and a cholesteric liquid crystal film disposed on the alignment film is used. The detection unit and the gas detection system including the gas unit and the gas detection method thereof can achieve the object of low cost, rapid detection, high sensitivity, high precision, and high reliability, and at least the present invention has been completed.
亦即，根據本發明之第一觀點，可以提供一氣體感測單元，其係包括：一透明基板；一配向膜，其配置於該透明基板之上；及一膽固醇液晶膜，其配置於該配向膜之上，並能夠為待測氣體所滲入。在前述氣體檢測單元中，該膽固醇液晶膜亦能夠與待測氣體發生作用。 That is, according to the first aspect of the present invention, a gas sensing unit can be provided, comprising: a transparent substrate; an alignment film disposed on the transparent substrate; and a cholesteric liquid crystal film disposed on the The alignment film is above and can penetrate the gas to be tested. In the gas detecting unit described above, the cholesteric liquid crystal film can also react with the gas to be tested.
再者，根據本發明之其他一觀點，可以提供一種氣體檢測系統，其係包括一氣體檢測單元，其配置有一透明基板、配置於該透明基板上之一配向膜、及配置於該配向膜上之一膽固醇液晶膜；一檢測室，其可容置待測氣體及具有至少可放置該氣體檢測單之空間；一檢測分析單元，其至少包括一光譜分析器，其用以偵測待測氣體滲入該膽固醇液晶膜過程中之經時光譜變化；及一資料處理單元，其能夠依據該經時光譜變化而得到螺距開始變化時間、螺距增大特定倍數之時間、膽固醇液晶膜之失效時間中之至少一者；並據以判斷與鑑別該待測氣體之特性。 Furthermore, according to another aspect of the present invention, a gas detecting system can be provided, comprising: a gas detecting unit configured to have a transparent substrate, an alignment film disposed on the transparent substrate, and disposed on the alignment film a cholesteric liquid crystal film; a detection chamber that can accommodate a gas to be tested and a space having at least a gas detection sheet; and a detection analysis unit that includes at least one spectrum analyzer for detecting the gas to be tested a time-dependent spectral change in the process of infiltrating the cholesteric liquid crystal film; and a data processing unit capable of obtaining a pitch start change time, a specific multiple of the pitch increase, and a failure time of the cholesteric liquid crystal film according to the temporal change of the spectrum At least one; and according to the judgment and identification of the characteristics of the gas to be tested.
更進一步地，根據本發明之另外觀點，可以提供一 種氣體檢測方法，其係包括：提供一待測氣體於一檢測室，該檢測室配置有一透明基板、一配置於該透明基板上之配向膜、及一配置於該配向膜上之膽固醇液晶膜，並可容置待測氣體；偵測該待測氣體滲入該膽固醇液晶膜過程中之經時光譜變化曲線圖；依據該經時光譜變化曲線圖，藉由運算而得到螺距開始變化時間、螺距增大特定倍數之時間、膽固醇液晶膜之失效時間中之至少一者；及依據該螺距開始變化時間、螺距增大特定倍數之時間、及/或膽固醇液晶膜之失效時間，來判斷及鑑別該待測氣體之特性。 Further, according to another aspect of the present invention, a The method for detecting a gas includes: providing a gas to be tested in a detection chamber, wherein the detection chamber is provided with a transparent substrate, an alignment film disposed on the transparent substrate, and a cholesteric liquid crystal film disposed on the alignment film And accommodating the gas to be tested; detecting a time-dependent spectral change curve of the gas to be tested infiltrating into the cholesteric liquid crystal film; according to the time-lapse spectral change graph, the pitch starts to change time and pitch by operation Increasing at least one of a specific multiple time, a failure time of the cholesteric liquid crystal film; and determining and identifying the time according to the pitch start change time, the pitch increase by a specific multiple, and/or the lapse time of the cholesteric liquid crystal film The characteristics of the gas to be tested.
TS‧‧‧待測氣體 TS‧‧‧ gas to be tested
LK‧‧‧訊號連結 LK‧‧‧ signal link
S110‧‧‧步驟 S110‧‧‧Steps
S120‧‧‧步驟 S120‧‧‧ steps
S130‧‧‧步驟 S130‧‧‧Steps
S140‧‧‧步驟 S140‧‧‧Steps
P‧‧‧膽固醇液晶膜 P‧‧‧Cholesterol liquid crystal film
1‧‧‧氣體檢測系統 1‧‧‧Gas detection system
10‧‧‧檢測室 10‧‧‧Test room
20‧‧‧檢測分析單元 20‧‧‧Detection and analysis unit
30‧‧‧資料處理單元 30‧‧‧Data Processing Unit
40‧‧‧氣體感測單元 40‧‧‧Gas sensing unit
50‧‧‧光源 50‧‧‧Light source
210‧‧‧光譜分析器 210‧‧‧Spectral Analyzer
211‧‧‧探針 211‧‧‧ probe
310‧‧‧處理器 310‧‧‧ processor
320‧‧‧記憶體 320‧‧‧ memory
330‧‧‧氣體特性資料庫 330‧‧‧Gas Characteristics Database
410‧‧‧玻璃基板 410‧‧‧ glass substrate
420‧‧‧配向膜 420‧‧‧Alignment film
圖1係顯示依據本發明之氣體檢測系統的一實施例的方塊圖。 BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram showing an embodiment of a gas detecting system in accordance with the present invention.
圖2係顯示依據本發明之氣體檢測系統的一實施例的示意圖。 Figure 2 is a schematic diagram showing an embodiment of a gas detection system in accordance with the present invention.
圖3係顯示氣體感測器之一實施例的剖面圖。 Figure 3 is a cross-sectional view showing one embodiment of a gas sensor.
圖4係顯示依據本發明之氣體檢測方法的一實施例的流程圖。 Figure 4 is a flow chart showing an embodiment of a gas detecting method in accordance with the present invention.
圖5係顯示依據本發明的膽固醇液晶薄膜檢測丙酮氣體所得到之經時光譜變化曲線圖。 Fig. 5 is a graph showing the time-dependent spectrum change obtained by detecting the acetone gas in the cholesteric liquid crystal film according to the present invention.
圖6係顯示依據本發明的膽固醇液晶薄膜檢測丁酮氣體所得到之經時光譜變化曲線圖。 Fig. 6 is a graph showing the time-dependent spectrum change obtained by detecting a methyl ketone gas in a cholesteric liquid crystal film according to the present invention.
圖7係顯示依據本發明的膽固醇液晶薄膜檢測環己酮氣體所得到之經時光譜變化曲線圖。 Fig. 7 is a graph showing the time-dependent spectrum change obtained by detecting a cyclohexanone gas in a cholesteric liquid crystal film according to the present invention.
圖8係顯示依據本發明的膽固醇液晶薄膜檢測二甲苯氣體所得到之經時光譜變化曲線圖。 Fig. 8 is a graph showing the time-dependent spectral change obtained by detecting a xylene gas in a cholesteric liquid crystal film according to the present invention.
圖9係顯示依據本發明的膽固醇液晶薄膜檢測正庚烷氣體所得到之經時光譜變化曲線圖。 Fig. 9 is a graph showing the time-dependent spectrum change obtained by detecting a n-heptane gas in a cholesteric liquid crystal film according to the present invention.
圖10係顯示依據本發明的膽固醇液晶薄膜檢測正丁醇氣體所得到之經時光譜變化曲線圖。 Fig. 10 is a graph showing the time-dependent spectral change obtained by detecting a n-butanol gas in a cholesteric liquid crystal film according to the present invention.
為使本發明上述之各項觀點更為明顯易懂，於下文中，將藉由附圖、實施例更進一步地詳細說明本發明。 The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
在本說明書中，請注意：在各圖面的構成要素上附加的參照號碼之際，只要是同一構成要素，即便是顯示在不同的圖面上也是盡可能地附加同一個號碼。 In this manual, please note that when the reference number is added to the components of each drawing, the same component is attached as much as possible, even if it is displayed on a different drawing.
本發明之氣體感測單元，其係包括：一透明基板；一配向膜，其配置於該透明基板之上；及一膽固醇液晶膜，其配置於該配向膜之上，並能夠為待測氣體所滲入。在前述氣體檢測單元中，該膽固醇液晶膜亦能夠與待測氣體發生作用。 The gas sensing unit of the present invention comprises: a transparent substrate; an alignment film disposed on the transparent substrate; and a cholesteric liquid crystal film disposed on the alignment film and capable of being a gas to be tested Infiltrated. In the gas detecting unit described above, the cholesteric liquid crystal film can also react with the gas to be tested.
又，使用於本發明之透明基板只要是具有透明性的基板即可，並未特別限制。例如，可以使用透明性高之玻璃基板、塑膠基板等。 Moreover, the transparent substrate used in the present invention is not particularly limited as long as it is a substrate having transparency. For example, a glass substrate, a plastic substrate, or the like having high transparency can be used.
再者，使用於本發明之配向膜只要是具有水平配向功能的薄膜即可，並未特別限制。例如，可以使用藉由塗布聚亞酰胺溶液(PI)並昇溫加以固化而成之薄膜。 Further, the alignment film to be used in the present invention is not particularly limited as long as it is a film having a horizontal alignment function. For example, a film obtained by coating a polyimide solution (PI) and raising the temperature can be used.
另外，使用於本發明之膽固醇液晶膜只要是適用於檢測有機氣體之膽固醇液晶膜即可，並未特別限制。例如，可以使用藉由將市售可得的膽固醇液晶溶液(3N1-12A-550-5)塗布固化而成之膽固醇液膜。 In addition, the cholesteric liquid crystal film to be used in the present invention is not particularly limited as long as it is a cholesteric liquid crystal film suitable for detecting an organic gas. For example, a cholesterol liquid film obtained by coating and curing a commercially available cholesteric liquid crystal solution (3N1-12A-550-5) can be used.
又，膽固醇液晶膜，除了必須能夠為待測氣體所滲入以外，較佳者為也能夠與待測氣體發生作用。 Further, the cholesteric liquid crystal film preferably has a function of infiltrating the gas to be tested, in addition to being infiltrated with the gas to be tested.
再者，本發明之氣體感測單元之配置構成並未特別限制，例如，如圖3所示，氣體感測單元40可以是依序配置玻璃基板410、配向膜420、膽固醇液晶膜P而構成。 Furthermore, the configuration of the gas sensing unit of the present invention is not particularly limited. For example, as shown in FIG. 3, the gas sensing unit 40 may be configured by sequentially arranging the glass substrate 410, the alignment film 420, and the cholesteric liquid crystal film P. .
另外，本發明所提供之氣體檢測單元係適用於檢測 環境中之各種氣體，特別是有機氣體。亦即，適用於利用本發明之氣體檢測單元進行檢測之待測氣體的種類，並未特別限制；例如，可以適用於檢測至少能夠鑑別含有選自於由丙酮、丁酮、環己酮、二甲苯、正庚烷及其組合所構成群組中之至少一者之待測氣體。 In addition, the gas detecting unit provided by the present invention is suitable for detecting Various gases in the environment, especially organic gases. That is, the kind of the gas to be tested which is suitable for detection by the gas detecting unit of the present invention is not particularly limited; for example, it can be applied to detect at least capable of identifying a content selected from the group consisting of acetone, methyl ethyl ketone, cyclohexanone, and A gas to be tested of at least one of the group consisting of toluene, n-heptane, and combinations thereof.
此外，本發明所提供之氣體檢測系統，其係包括一氣體檢測單元，其配置有一透明基板、配置於該透明基板上之一配向膜、及配置於該配向膜上之一膽固醇液晶膜；一檢測室，其可容置待測氣體及具有至少可放置該氣體檢測單之空間；一檢測分析單元，其至少包括一光譜分析器，其用以偵測待測氣體滲入該膽固醇液晶膜過程中之經時光譜變化曲線圖；及一資料處理單元，其能夠依據該經時光譜變化曲線圖而得到螺距開始變化時間、螺距增大特定倍數之時間、膽固醇液晶膜之失效時間中之至少一者；並據以判斷與鑑別該待測氣體之特性。 In addition, the gas detecting system of the present invention includes a gas detecting unit, which is provided with a transparent substrate, an alignment film disposed on the transparent substrate, and a cholesteric liquid crystal film disposed on the alignment film; a detection chamber, which can accommodate a gas to be tested and a space for at least the gas detection sheet to be placed; a detection analysis unit comprising at least one spectrum analyzer for detecting the penetration of the gas to be tested into the cholesteric liquid crystal film a time-dependent spectral change curve; and a data processing unit capable of obtaining at least one of a pitch start change time, a specific multiple of the pitch increase, and a failure time of the cholesteric liquid crystal film according to the temporal spectral change profile And according to the judgment and identification of the characteristics of the gas to be tested.
又，在本發明之氣體檢測系統中所使用之檢測室並未特別限制，只要是具有容納空間即可。從檢測精準度觀點來看，檢測室較佳為密閉空間。 Further, the detection chamber used in the gas detecting system of the present invention is not particularly limited as long as it has a storage space. From the viewpoint of detection accuracy, the detection chamber is preferably a closed space.
其次，在本發明之氣體檢測系統中所使用之透明基板並未特別限制，只要是具有透明性的基板即可。例如，可以使用透明性高之玻璃基板、塑膠基板等。 Next, the transparent substrate used in the gas detecting system of the present invention is not particularly limited as long as it is a substrate having transparency. For example, a glass substrate, a plastic substrate, or the like having high transparency can be used.
再者，在本發明之氣體檢測系統中所使用之配向膜，並未特別限制只要是具有配向功能的薄膜即可。例如，可以使用藉由旋轉塗布聚亞酰胺溶液(PI)並昇溫加以固化而成之薄膜。 Further, the alignment film used in the gas detecting system of the present invention is not particularly limited as long as it is a film having an alignment function. For example, a film obtained by spin coating a polyimide solution (PI) and raising the temperature can be used.
另外，在本發明之氣體檢測系統中所使用之膽固醇液晶膜，並未特別限制，只要是適用於檢測有機氣體之膽固醇液晶膜即可。例如，可以使用藉由將市售可得的膽固醇液晶溶液 (3N1-12A-550-5)塗布而成之膽固醇液晶膜。又，膽固醇液晶膜，除了必須能夠為待測氣體所滲入以外，較佳者為能夠與待測氣體發生作用。 Further, the cholesteric liquid crystal film used in the gas detecting system of the present invention is not particularly limited as long as it is a cholesteric liquid crystal film suitable for detecting an organic gas. For example, a commercially available cholesteric liquid crystal solution can be used. (3N1-12A-550-5) coated cholesteric liquid crystal film. Further, the cholesteric liquid crystal film is preferably capable of interacting with the gas to be tested, in addition to being infiltrated into the gas to be tested.
此外，在本發明之氣體檢測系統中所使用之檢測分析單元係至少包括一光譜分析器。該光譜分析器並未特別限制，只要能夠檢測分析待測氣體、膽固醇液晶膜等之光學性質變化即可。例如，在本發明之氣體檢測系統中所使用之檢測分析單元係至少能夠偵測待測氣體滲入該膽固醇液晶膜過程中之經時光譜變化曲線圖。 Further, the detection analysis unit used in the gas detection system of the present invention includes at least one spectrum analyzer. The spectrum analyzer is not particularly limited as long as it can detect changes in optical properties of the gas to be measured, the cholesteric liquid crystal film, and the like. For example, the detection and analysis unit used in the gas detection system of the present invention is capable of detecting at least a time-dependent spectral change curve of the gas to be tested infiltrating into the cholesteric liquid crystal film.
又，根據本發明之其他一觀點，由於膽固醇液晶薄膜的穿透/或反射頻帶之左側邊帶與右側邊帶的波長分別為λ L =n o p、λ R =n e p，其中λ L 與λ R 分別表示光譜頻帶左側波長與右側波長位置；n 0 、n e 分別表示液晶尋常光折射率、異常光折射率，p表示膽固醇液晶膜的螺距。由於異常光折射率n e 會隨著液晶分子的排列狀態而改變，並且膽固醇液晶膜的螺距會受到氣體的擾動而變異，若利用光譜頻帶的中心波長或右側波長位置的飄移特性來進行分析，實在難以利用膽固醇液晶薄膜的光譜特性來針對氣體感測行為進行精確的量化分析；故在本發明中提出一新穎、簡單的分析方法，我們藉由所測量得到之經時的穿透/或反射頻帶之左側波長飄移分析來計算得到膽固醇液晶螺旋結構因氣體分子擴散入膽固醇液晶薄膜中而造成螺距p的變化。因此前述之氣體檢測方法係可依據該經時光譜變化而進一步依據下式計算而得到該膽固醇液晶膜之螺距變化量；p(t)/p(0)=λ L (t)/λ L (0) Further, according to another aspect of the present invention, since the wavelengths of the left side band and the right side band of the penetration/or reflection band of the cholesteric liquid crystal film are respectively λ L = n o p , λ R = n e p , wherein λ L And λ R represent the left wavelength and the right wavelength position of the spectral band, respectively; n 0 and n e respectively represent the ordinary refractive index of the liquid crystal and the refractive index of the extraordinary light, and p represents the pitch of the cholesteric liquid crystal film. Since the extraordinary refractive index n e changes with the alignment state of the liquid crystal molecules, and the pitch of the cholesteric liquid crystal film is mutated by the disturbance of the gas, if the analysis is performed by using the center wavelength of the spectral band or the drift characteristic of the right wavelength position, It is difficult to utilize the spectral characteristics of the cholesteric liquid crystal film to accurately quantify the gas sensing behavior; therefore, in the present invention, a novel and simple analysis method is proposed, which is measured by the measured penetration/reflection. The wavelength shift analysis on the left side of the frequency band is used to calculate the change in the pitch p caused by the diffusion of gas molecules into the cholesteric liquid crystal film. Therefore, the gas detection method described above can further calculate the pitch variation of the cholesteric liquid crystal film according to the temporal change of the spectrum; p ( t ) / p (0) = λ L ( t ) / λ L ( 0)
其中，λ L (t)表示在時間t時的光譜頻帶的左側波長；λL(0)表示膽固醇液晶薄膜初始的左側波長。 Where λ L (t) represents the left wavelength of the spectral band at time t; λ L (0) represents the initial left wavelength of the cholesteric liquid crystal film.
再者，在本發明之氣體檢測系統中所使用之資料處理單元係能夠依據該經時光譜變化而得到暫態光譜響應、螺距變化、光譜紅移現象及該膽固醇液晶膜之失效時間中之至少一者；並據以判斷與鑑別該待測氣體之特性。 Furthermore, the data processing unit used in the gas detecting system of the present invention is capable of obtaining at least one of a transient spectral response, a pitch change, a spectral red shift phenomenon, and a failure time of the cholesteric liquid crystal film according to the temporal change in the spectrum. One; and according to the judgment and identification of the characteristics of the gas to be tested.
此外，本發明之氣體檢測系統之構成並未特別限制，例如，如圖1所示，氣體檢測系統1可以是由檢測室10、檢測分析單元20、膽固醇液晶膜P、資料處理單元30而構成。 Further, the configuration of the gas detecting system of the present invention is not particularly limited. For example, as shown in FIG. 1, the gas detecting system 1 may be constituted by the detecting chamber 10, the detecting and analyzing unit 20, the cholesteric liquid crystal film P, and the data processing unit 30. .
具體而言，本發明之氣體檢測系統可以是如圖2所示之構成，舉例來說，例如，其中可以包括探針211、檢測室10、氣體感測單元40、待測氣體TS、光源50、檢測分析單元20、光譜分析器210、資料處理單元30、處理器310、記憶體320、氣體特性資料庫330、訊號連結LK。 Specifically, the gas detecting system of the present invention may be configured as shown in FIG. 2, for example, which may include a probe 211, a detection chamber 10, a gas sensing unit 40, a gas to be tested TS, and a light source 50. The detection and analysis unit 20, the spectrum analyzer 210, the data processing unit 30, the processor 310, the memory 320, the gas property database 330, and the signal link LK.
另外，本發明所提供之氣體檢測系統係適用於檢測環境中之各種氣體，特別是有機氣體。亦即，適用於利用本發明之氣體檢測系統進行檢測之待測氣體的種類，並未特別限制；例如，可以適用於檢測至少能夠鑑別含有選自於由丙酮、丁酮、環己酮、二甲苯、正庚烷及其組合所構成群組中之至少一者之待測氣體。 In addition, the gas detection system provided by the present invention is suitable for detecting various gases, particularly organic gases, in an environment. That is, the kind of the gas to be tested which is suitable for detection by the gas detecting system of the present invention is not particularly limited; for example, it can be applied to detect at least capable of identifying a content selected from the group consisting of acetone, methyl ethyl ketone, cyclohexanone, and A gas to be tested of at least one of the group consisting of toluene, n-heptane, and combinations thereof.
更進一步地，根據上述以外之另一觀點，本發明可以提供一種氣體檢測方法，其係包括：提供一待測氣體於一檢測室，該檢測室配置有一透明基板、一配置於該透明基板上之配向膜、及一配置於該配向膜上之膽固醇液晶膜，並可容置待測氣體；偵測該待測氣體滲入該膽固醇液晶膜過程中之經時光譜變化；依據該經時光譜變化，藉由運算而得到螺距開始變化時間、螺距增大特定倍數之時間、膽固醇液晶膜之失效時間中之至少一者；及依據該螺距開始變化時間、螺距增大特定倍數之時間、膽固醇液 晶膜之失效時間，來判斷及鑑別該待測氣體之特性。 Further, according to another aspect, the present invention may provide a gas detecting method, comprising: providing a gas to be tested in a detecting chamber, wherein the detecting chamber is disposed with a transparent substrate, and is disposed on the transparent substrate An alignment film, and a cholesteric liquid crystal film disposed on the alignment film, and accommodating the gas to be tested; detecting a temporal change of the time during which the gas to be tested penetrates into the cholesteric liquid crystal film; And obtaining, by calculation, at least one of a pitch start change time, a time when the pitch is increased by a specific multiple, and a failure time of the cholesteric liquid crystal film; and a time when the pitch starts to change, the pitch increases by a specific multiple, and the cholesterol liquid The failure time of the crystal film is used to judge and identify the characteristics of the gas to be tested.
又，根據本發明之其他一觀點，前述氣體檢測系統也可以依據該經時光譜變化而進一步依據下式計算而得到該膽固醇液晶膜之螺距變化量；p(t)/p(0)=λ L (t)/λ L (0) According to another aspect of the present invention, the gas detecting system may further obtain a pitch variation amount of the cholesteric liquid crystal film according to the temporal change of the time; p ( t ) / p (0) = λ L ( t ) / λ L (0)
其中，p表示膽固醇液晶膜的螺距，λ L (t)表示在時間t時的光譜頻帶左側波長，λ L (0)表示初始的左側波長。 Wherein p represents the pitch of the cholesteric liquid crystal film, λ L (t) represents the wavelength to the left of the spectral band at time t, and λ L (0) represents the initial left wavelength.
另外，本發明所提供之氣體檢測方法係適用於檢測環境中之各種氣體，特別是有機氣體。亦即，適用於利用本發明之氣體檢測方法進行檢測之待測氣體的種類，並未特別限制；例如，可以適用於檢測至少能夠鑑別含有選自於由丙酮、丁酮、環己酮、二甲苯、正庚烷及其組合所構成群組中之至少一者之待測氣體。 In addition, the gas detection method provided by the present invention is suitable for detecting various gases, particularly organic gases, in an environment. That is, the kind of the gas to be tested which is suitable for detection by the gas detecting method of the present invention is not particularly limited; for example, it can be applied to detect at least capable of identifying a content selected from the group consisting of acetone, methyl ethyl ketone, cyclohexanone, and A gas to be tested of at least one of the group consisting of toluene, n-heptane, and combinations thereof.
此外，本發明之氣體檢測方法之構成並未特別限制，例如，如圖4所示，氣體檢測方法可以包括提供一待測氣體於一檢測室(步驟S110)；偵測該待測氣體滲入該膽固醇液晶膜過程中之經時光譜變化曲線圖(步驟S120)；依據該經時光譜變化曲線圖，藉由運算而得到螺距開始變化時間、螺距增大特定倍數之時間、膽固醇液晶膜之失效時間中之至少一者(步驟S130)；及依據該螺距開始變化時間、螺距增大特定倍數之時間、膽固醇液晶膜之失效時間來判斷及鑑別該待測氣體之特性(步驟S140)。 In addition, the composition of the gas detecting method of the present invention is not particularly limited. For example, as shown in FIG. 4, the gas detecting method may include providing a gas to be tested in a detecting chamber (step S110); detecting that the gas to be tested penetrates into the gas A graph of the time-dependent spectral change in the cholesteric liquid crystal film process (step S120); according to the time-lapse spectral change curve, the pitch start change time, the specific time of the pitch increase, and the lapse time of the cholesteric liquid crystal film are obtained by calculation At least one of the steps (step S130); and determining and identifying the characteristics of the gas to be tested according to the start time of the pitch, the time when the pitch is increased by a specific multiple, and the time of failure of the cholesteric liquid crystal film (step S140).
本發明係關於氣體感測單元、氣體檢測系統及氣體檢測方法，特別是關於一種包括透明基板、配向膜及膽固醇液晶膜之氣體檢測單元；一種包括該氣體感測單元、檢測室、檢測分析單元、及資料處理單元之氣體檢測系統；以及一種使用彼等之氣體檢測方法。 The present invention relates to a gas sensing unit, a gas detecting system, and a gas detecting method, and more particularly to a gas detecting unit including a transparent substrate, an alignment film, and a cholesteric liquid crystal film; and the gas sensing unit, the detecting chamber, and the detecting and analyzing unit And a gas detection system for the data processing unit; and a gas detection method using the same.
本發明之目的、特定的優點及新穎特徴，可以藉由以下之與附加圖面有關的詳細說明、以及較佳實施例而更加地清楚明瞭。 The details of the invention, the specific advantages and the novel features of the invention are set forth in the claims
以下，參照附屬圖面來詳細地說明本發明之較佳實施例。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
首先，準備玻璃基板(2×2.5cm2)並進行清洗烘乾。在該玻璃基板上，以旋轉塗布方式，塗布聚酰亞胺溶液(PI)並加溫固化，然後再藉由包覆尼龍布的滾輪進行定向摩擦，使形成具有使液晶分子排列方向一定的配向膜；接著，利用刮刀在配向完成之玻璃基板刮上厚度約5μm的膽固醇液晶溶液(膽固醇液晶：3N1-12A-550-5；反射頻譜中心波長為~550nm)，如此即完成氣體感測單元1(膽固醇液晶感測膜)的製備。 First, a glass substrate (2 × 2.5 cm 2 ) was prepared and washed and dried. On the glass substrate, a polyimide solution (PI) is applied by spin coating, heated and solidified, and then directionally rubbed by a roller coated with a nylon cloth to form a alignment having a certain alignment direction of the liquid crystal molecules. a film; then, a sulphuric liquid crystal solution having a thickness of about 5 μm (cholesterol liquid crystal: 3N1-12A-550-5; a center wavelength of the reflection spectrum of ~550 nm) is scraped on the aligned glass substrate by a doctor blade, thus completing the gas sensing unit 1 Preparation of (cholesterol liquid crystal sensing film).
將製備例1所得到的氣體感測單元1(膽固醇液晶感測膜)置於如圖2所示的本發明之氣體檢測系統之檢測室10中，從檢測室上方針孔處注入20毫升的各試樣有機溶液(分別為丙酮溶液、丁酮溶液、環己酮溶液、二甲苯溶液、正庚烷溶液、正丁醇溶液)，使丙酮、丁酮、環己酮、二甲苯、正庚烷、正丁醇的氣體，從該試樣有機溶液中自然揮發出來，並充斥於檢測室10之密閉環境中。此時，光學探針211和膽固醇液晶膜之間的距離為約1cm左右。接著，打開光源50，使用本發明氣體檢測系統之檢測分析單元20中所配備之光譜分析器210，於波長 400-700nm的範圍進行光譜掃描，分別偵測由各不同試樣有機溶液中所揮發出來的待測氣體(即丙酮、丁酮、環己酮、二甲苯、正庚烷、正丁醇)擴散滲入該膽固醇液晶膜過程中之經時光譜變化而得到各待測氣體之經時光譜變化曲線圖(參照圖5~圖10)。 The gas sensing unit 1 (cholesterol liquid crystal sensing film) obtained in Preparation Example 1 was placed in the detection chamber 10 of the gas detecting system of the present invention as shown in FIG. 2, and 20 ml was injected from the policy hole at the detection chamber. Each sample organic solution (acetone solution, methyl ethyl ketone solution, cyclohexanone solution, xylene solution, n-heptane solution, n-butanol solution) to make acetone, methyl ethyl ketone, cyclohexanone, xylene, n-glycol The gas of the alkane or n-butanol is naturally volatilized from the organic solution of the sample and is filled in the sealed environment of the detection chamber 10. At this time, the distance between the optical probe 211 and the cholesteric liquid crystal film is about 1 cm. Next, the light source 50 is turned on, using the spectrum analyzer 210 provided in the detection and analysis unit 20 of the gas detection system of the present invention, at the wavelength Spectral scanning in the range of 400-700 nm, respectively detecting the diffusion of the gas to be tested (ie, acetone, methyl ethyl ketone, cyclohexanone, xylene, n-heptane, n-butanol) volatilized from the organic solution of each sample A time-dependent spectral change of each gas to be measured is obtained by infiltrating the time-dependent spectral change in the cholesteric liquid crystal film (see FIGS. 5 to 10).
接著，利用資料處理單元30，依據下式計算而得到經時螺距變化曲線圖，藉由經時螺距變化曲線圖求得螺距位移的起始時間(秒)、螺距增大為1.2倍之時間(秒)、及該膽固醇液晶膜之失效時間(秒)；p(t)/p(0)=λ L (t)/λ L (0) Then, using the data processing unit 30, the time-lapse pitch curve is obtained according to the following formula, and the start time (seconds) of the pitch displacement and the time when the pitch is increased by 1.2 times are obtained by the time-pitch curve. Seconds, and the failure time of the cholesteric liquid crystal film (seconds); p ( t ) / p (0) = λ L ( t ) / λ L (0)
其中，λ L (t)表示在時間t時的光譜頻帶的左側波長，λ L (0)表示膽固醇液晶薄膜初始的左側波長。 Where λ L (t) represents the left wavelength of the spectral band at time t, and λ L (0) represents the initial left wavelength of the cholesteric liquid crystal film.
將上述所得到的各有機氣體之螺距開始變化的時間(秒)、螺距增大為1.2倍之時間(秒)、膽固醇液晶膜之失效時間(秒)結果表示於表1。 Table 1 shows the time (seconds) at which the pitch of each organic gas obtained as described above began to change, the time (seconds) at which the pitch was increased by 1.2 times, and the time (seconds) of the cholesteric liquid crystal film.
將製備例1所得到的氣體感測單元1(膽固醇液晶感測膜)置於如圖2所示的本發明之氣體檢測系統之檢測室10中，從 檢測室上方針孔處注入40毫升的各試樣有機溶液(分別為20%、30%、40%、50%、60%、70%、80%之丙酮溶液)，使各不同濃度之丙酮的氣體，從該試樣有機溶液中自然揮發出來，並充斥於檢測室10之密閉環境中。此時，光學探針211和膽固醇液晶膜之間的距離為約1cm左右。接著，打開光源50，使用本發明氣體檢測系統之檢測分析單元20中所配備之光譜分析器210，分別偵測由各不同試樣有機溶液中所揮發出來的待測氣體(即丙酮)滲入該膽固醇液晶膜過程中之經時光譜變化。 The gas sensing unit 1 (cholesterol liquid crystal sensing film) obtained in Preparation Example 1 was placed in the detection chamber 10 of the gas detecting system of the present invention as shown in FIG. 2, from Inject 40 ml of each sample organic solution (20%, 30%, 40%, 50%, 60%, 70%, 80% acetone solution) into the policy hole on the test chamber to make acetone of different concentrations. The gas naturally evaporates from the organic solution of the sample and is filled in the closed environment of the detection chamber 10. At this time, the distance between the optical probe 211 and the cholesteric liquid crystal film is about 1 cm. Next, the light source 50 is turned on, and the spectrum analyzer 210 provided in the detection and analysis unit 20 of the gas detection system of the present invention is used to detect that the gas to be tested (ie, acetone) volatilized from the organic solution of each sample is infiltrated into the Time-dependent spectral changes in the cholesteric liquid crystal film process.
接著，利用資料處理單元30，依據該經時光譜變化與下式計算而得到螺距位移的起始時間(秒)及該膽固醇液晶膜之失效時間(秒)；p(t)/p(0)=λ L (t)/λ L (0) Then, using the data processing unit 30, the start time (seconds) of the pitch displacement and the failure time (seconds) of the cholesteric liquid crystal film are obtained according to the temporal change of the spectrum and the calculation of the following formula; p ( t ) / p (0) = λ L ( t ) / λ L (0)
其中，λL(t)表示在時間t時的光譜頻帶的左側波長，λL(0)表示膽固醇液晶薄膜初始的左側波長。 Where λ L (t) represents the left wavelength of the spectral band at time t, and λ L (0) represents the initial left wavelength of the cholesteric liquid crystal film.
將上述所得到的各有機氣體之螺距開始變化的時間(秒)膽固醇液晶膜之失效時間(秒)結果表示於表2。 The time (seconds) at which the pitch of each organic gas obtained as described above starts to change is shown in Table 2.
將製備例1所得到的氣體感測單元1(膽固醇液晶感 測膜)置於如圖2所示的本發明之氣體檢測系統之檢測室10中，從檢測室上方針孔處注入20毫升的待檢測有機溶液，使待測有機氣體從該待檢樣有機溶液中自然揮發出來，並充斥於檢測室10之密閉環境中。此時，光學探針211和膽固醇液晶膜之間的距離為約1cm左右。接著，打開光源50，使用本發明氣體檢測系統之檢測分析單元20中所配備之光譜分析器210，偵測由待檢測有機溶液中所揮發出來的待測氣體滲入該膽固醇液晶膜過程中之經時光譜變化曲線圖。 The gas sensing unit 1 obtained in Preparation Example 1 (cholesterol liquid crystal sensation) The film is placed in the detection chamber 10 of the gas detection system of the present invention as shown in FIG. 2, and 20 ml of the organic solution to be detected is injected from the policy hole on the detection chamber, so that the organic gas to be tested is organic from the sample to be tested. The solution naturally evaporates and fills the sealed environment of the detection chamber 10. At this time, the distance between the optical probe 211 and the cholesteric liquid crystal film is about 1 cm. Then, the light source 50 is turned on, and the spectrum analyzer 210 provided in the detection and analysis unit 20 of the gas detection system of the present invention is used to detect the infiltration of the gas to be tested volatilized from the organic solution to be detected into the cholesteric liquid crystal film. Time spectrum curve.
接著，利用資料處理單元30，並依據下式計算而得到經時螺距變化曲線圖；依據該光譜變化曲線圖、經時螺距變化曲線圖求得螺距明顯位移的開始時間(秒)及該膽固醇液晶膜之失效時間(秒)；p(t)/p(0)=λ L (t)/λ L (0) Then, using the data processing unit 30, and calculating the curve of the time-dependent pitch according to the following formula; determining the starting time (seconds) of the apparent displacement of the pitch and the cholesteric liquid crystal according to the spectrum change curve and the time-lapse pitch curve Membrane failure time (seconds); p ( t ) / p (0) = λ L ( t ) / λ L (0)
其中，λL(t)表示在時間t時的光譜頻帶的左側波長，λL(0)表示膽固醇液晶薄膜初始的左側波長。 Where λ L (t) represents the left wavelength of the spectral band at time t, and λ L (0) represents the initial left wavelength of the cholesteric liquid crystal film.
依據上述所得到的待測有機氣體之螺距開始變化的時間為215秒、螺距增大為1.2倍之時間為865秒、膽固醇液晶膜之失效時間為923秒，對照表1可知待測有機氣體為正庚烷。 According to the above, the time of starting the change of the pitch of the organic gas to be tested is 215 seconds, the time when the pitch is increased by 1.2 times is 865 seconds, and the time of failure of the cholesteric liquid crystal film is 923 seconds. Table 1 shows that the organic gas to be tested is N-heptane.
將與實施例3進行相同操作，經由利用資料處理單元30求得螺距明顯位移的開始時間(秒)及該膽固醇液晶膜確認溶液中所含的有機氣體為丙酮之待測有機溶液A(以下稱為「丙酮待檢測溶液)，進一步稀釋特定倍數，然進行與實施例2同樣的操作與分析，結果得到待測有機氣體之螺距開始變化的時間為17分30 秒、膽固醇液晶膜之失效時間為20分30秒，對照表2可推知待檢測溶液中含有約30%之丙酮。 The same operation as in the third embodiment will be carried out, and the starting time (seconds) at which the pitch is significantly shifted and the organic liquid gas contained in the solution of the cholesteric liquid crystal film are confirmed to be the organic solution A to be tested by the data processing unit 30 (hereinafter referred to as The "acetone to be detected solution" was further diluted by a specific factor, and the same operation and analysis as in Example 2 were carried out, and as a result, the time at which the pitch of the organic gas to be tested began to change was 17 minutes and 30 minutes. The failure time of the celite liquid crystal film is 20 minutes and 30 seconds. It can be inferred from Table 2 that about 30% of acetone is contained in the solution to be tested.
上述表1、表2所示之結果，可以確認利用本發明之氣體感測單元、氣體檢測系統及氣體檢測方法，可得到待測氣體滲入該膽固醇液晶膜過程中之經時光譜變化曲線圖；並據以求得螺距開始變化時間、螺距增大特定倍數之時間、膽固醇液晶膜之失效時間，能夠快速檢測、判斷與鑑別該待測氣體之種類等特性，且亦能夠求出該待測氣體在環境中所存在之量。 As shown in the above Tables 1 and 2, it can be confirmed that the gas sensing unit, the gas detecting system and the gas detecting method of the present invention can obtain a time-dependent spectral change curve of the gas to be tested infiltrating into the cholesteric liquid crystal film; According to the determination of the pitch start time, the specific time of the pitch increase, and the failure time of the cholesteric liquid crystal film, the characteristics of the gas to be tested can be quickly detected, judged and identified, and the gas to be tested can also be obtained. The amount that exists in the environment.
以上，雖然是基於具體的實施例詳細地說明本發明了，然而該等是用以具體地說明本發明而已，本發明不限定於此而已，只要是具有該領域中之通常知識者皆可以明白：在本發明之技術的思想內的變形及改良的可能性。 The present invention has been described above in detail based on the specific embodiments. However, the present invention is specifically described by the present invention, and the present invention is not limited thereto, as long as it is common to those skilled in the art. : The possibility of modification and improvement within the idea of the technology of the present invention.
本發明之單純的變形或變更中之任一者皆屬於本發明的領域，而且本發明之具體的保護範圍藉由附加的專利申範圍而變得明確化了。 Any of the modifications and variations of the present invention are intended to be within the scope of the present invention, and the specific scope of the invention is defined by the scope of the appended claims.
P‧‧‧膽固醇液晶膜 P‧‧‧Cholesterol liquid crystal film
1‧‧‧氣體檢測系統 1‧‧‧Gas detection system
10‧‧‧檢測室 10‧‧‧Test room
20‧‧‧檢測分析單元 20‧‧‧Detection and analysis unit
30‧‧‧資料處理單元 30‧‧‧Data Processing Unit
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