JP2009236891A - Gas detecting cell and gas detector with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas detecting cell capable of achieving both of a response speed and detection sensitivity at a high level, and a gas detector with the same. <P>SOLUTION: The gas detecting cell 1 includes a catalytic chemical light emitting element 3 which emits light by the catalytic oxidation reaction of the combustible gas contained in an inspection target gas, a flow channel 4 which is formed in parallel to the surface of the catalyst layer 3a belonging to the catalytic chemical light emitting element 3 and from which the catalyst layer 3a is exposed, and a heater 3b for heating the catalyst layer 3a. The gas detector 10 includes the gas detecting cell 1, a gas supply means 2 for supplying the inspection target gas to the catalyst layer 3a through the flow channel 4 of the gas detecting cell 1, and a spectrum measuring means 7 for measuring the emission spectrum produced by the catalytic oxidation reaction of the combustible gas in the catalyst layer 3a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gas detection cell for detecting a combustible gas contained in a gas to be inspected, and a gas detection apparatus including the same.

  The following are known as gas detectors for the purpose of identifying and quantifying the gas species contained in the gas to be inspected. (1) A detector including a semiconductor element whose electrical conductivity changes due to gas adsorption, (2) a detector including a crystal resonator having a gas absorption film whose mass changes due to gas absorption, and (3) gas. Detector having a surface acoustic wave element having a gas absorption film whose acoustic wave propagation characteristics change due to absorption of gas, and (4) a detector having a catalytic chemiluminescence element that generates chemiluminescence in association with a catalytic oxidation reaction of gas Etc.

  Among the gas detectors described above, (4) the detector equipped with the catalytic chemiluminescent element has the feature that the linearity and reproducibility of the sensor output with respect to the gas concentration and the response speed can be achieved at a high level. Have.

Various types of gas detection cells have been proposed so far that form a dark box containing a catalytic chemiluminescent element. For example, Patent Document 1 describes a dark box that houses a gas detector and a photodetector provided on a heat-resistant substrate. Patent Document 2 describes a dark box that houses a plurality of light emitting elements. Patent Documents 3 and 4 describe a sensor housing portion in which an internal space is partitioned by a separation wall having a communication port in order to blow an inspection target gas onto the sensor catalyst.
JP-A-4-172235 Japanese Patent No. 3742975 JP 2005-69943 A JP 2005-283216 A

  However, the gas detection devices described in Patent Documents 1 and 2 do not particularly take into consideration the flow of the inspection target gas in the dark box, and there is a possibility that gas turbulence and stagnation may occur in the dark box. There was room for improvement in terms of stability, reproducibility, and response speed. In addition, the gas detectors described in Patent Documents 3 and 4 provide a relatively stable output because the gas to be inspected is blown through the communication port. There was room for improvement in terms of speed.

  Further, as a point to be improved in common with the gas detection devices described in Patent Documents 1 to 4, adsorption or adhesion of gas and reaction products to the inner wall surface of the dark box can be mentioned. For example, if the inner surface of the dark box is contaminated due to adhesion of reaction products, weak light may not be sufficiently detected by a photodetector.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a gas detection cell capable of achieving both a response speed and a detection sensitivity at a high level and a gas detection device including the same. .

  A gas detection cell according to the present invention is formed in parallel with a catalytic chemiluminescent element that emits light by catalytic oxidation reaction of a combustible gas contained in a gas to be inspected, and a surface of a catalyst layer included in the catalytic chemiluminescent element, and A flow path in which the catalyst layer is exposed, and a heater for heating the catalyst layer.

  According to the gas detection cell according to the present invention, a laminar flow can be generated in the flow path by adjusting the flow rate of the inspection target gas. Thereby, the stay of gas in the flow path is suppressed, and a high response speed can be achieved. Furthermore, according to this gas detection cell, the flow path can be made sufficiently flat. As a result, the gas detection cell can be thinned, and the catalytic chemiluminescent device (hereinafter simply referred to as “light emitting device”) and the photodetector can be disposed sufficiently close to each other. Detection sensitivity can be improved. In addition, by arranging the light emitting element and the light detector close to each other, the heat of the heater for heating the catalyst layer of the light emitting element is easily transmitted to the inner wall surface of the flow path and the light detection opening. The flammable gas and its reaction product can be sufficiently prevented from adhering to the region, and the high detection sensitivity can be sufficiently maintained.

  A gas detection device according to the present invention includes a gas detection cell according to the present invention, a gas supply means for supplying a test target gas to a catalyst layer through a flow path of the gas detection cell, and a combustible gas in the catalyst layer. Spectrum measuring means for measuring an emission spectrum generated by the catalytic oxidation reaction.

  According to the gas detection device of the present invention, by causing a laminar flow in the flow path of the gas detection cell, gas retention in the flow path is suppressed, and a high response speed can be achieved. Furthermore, since the light emitting element and the photodetector can be arranged sufficiently close to each other, detection sensitivity can be improved. In addition, by arranging the light emitting element and the light detector close to each other, the heat of the heater for heating the catalyst layer of the light emitting element is easily transmitted to the inner wall surface of the flow path and the opening for light detection. The flammable gas and its reaction product can be sufficiently prevented from adhering to the region, and the high detection sensitivity can be sufficiently maintained.

  According to the present invention, both response speed and detection sensitivity can be achieved at a high level.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

<Gas detection device>
FIG. 1 is a perspective view showing a first embodiment of a gas detection cell according to the present invention. FIG. 2 is a schematic cross-sectional view of a gas detection apparatus provided with the gas detection cell 1 shown in FIG. 1, and the cross-sectional view of the gas detection cell 1 in FIG. It is shown.

  A gas detection device 10 according to the present embodiment is for detecting a plurality of types of combustible gases contained in a gas to be inspected, and as shown in FIG. 2, a gas detection cell 1 and a gas separation unit. 2, an optical filter unit 6, a photodetector 7, and an analysis unit 8. The inspection target gas is introduced into the gas detection cell 1 through a gas separation unit 2 including a gas separation column. The gas detection cell 1 is configured such that no light enters from the outside when the photodetector 7 is attached.

  One light emitting element 3 is accommodated in the gas detection cell 1, and light emitted from the light emitting element 3 is measured by a photodetector 7 through an optical filter unit 6 mounted in an opening. An electrical signal from the photodetector 7 is sent to the analysis unit 8 where the gas type is identified and analyzed for its concentration. In the present embodiment, the optical filter unit 6, the photodetector 7, and the analysis unit 8 constitute spectrum measuring means.

  As shown in FIGS. 1 and 2, the gas detection cell 1 according to the present embodiment is formed in parallel with the surface of the catalyst layer 3 a of the light emitting element 3 and the flow of the inspection target gas with the catalyst layer 3 a exposed. It has a path 4. As shown in FIG. 2, the flow path 4 has a very flat height from the lower surface to the upper surface of about 1.5 mm. Therefore, the light emitting element 3 and the light detector 7 should be arranged sufficiently close to each other. Can do.

  The gas detection cell 1 has a gas introduction path 4a and a gas discharge path 4b that respectively connect two openings and a flow path 4 provided on the bottom surface thereof. The inspection target gas introduced from the gas introduction path 4a through the gas separation unit 2 flows through the flow path 4, contacts the catalyst layer 3a, and is then discharged through the gas discharge path 4b (see the arrow shown in FIG. 2). ).

  In the gas detection cell 1, protective layers 5a and 5b made of a material having heat resistance of 500 ° C. or higher are provided in a region heated by the heat of the heater 3b of the light emitting element. Between the catalyst layer 3a and the optical filter unit 6, a glass plate 5c that transmits light in the wavelength band to be measured and has heat resistance of 500 ° C. or higher is provided. The glass plate 5 c has a surface on the flow channel 4 side that forms part of the inner wall surface of the flow channel 4, and is disposed so as to be flush with the other inner wall surface of the flow channel 4. This can sufficiently prevent the gas flow in the flow path 4 from being disturbed.

  The materials used for the protective layers 5a and 5b and the glass plate 5c are preferably those having a thermal conductivity at 300K of 5 W / m / K or less, specifically, glass, quartz glass, Pyrex (registered trademark) glass. And ceramics. Among these, quartz glass and pyrex glass are particularly suitable because they have high heat resistance and low thermal conductivity, and have a small heat capacity and resistance to thermal shock.

  The gas separation unit 2 is disposed upstream of the gas introduction path 4a of the gas detection cell 1, and is introduced into the gas detection cell 1 in a state where a plurality of combustible gases contained in the inspection target gas are separated. Is to do. The gas separation unit 2 can be configured by a gas separation column, a flow controller for carrier gas, and a device for mixing a gas to be inspected and air (oxygen).

  The light-emitting element 3 is for performing identification of the gas species contained in the inspection target gas and measurement of the concentration. The light emitting element 3 includes a catalyst layer 3a composed of a plurality of catalyst components, and a heater 3b for heating the catalyst layer 3a. As the heater 3b, for example, a printed wiring provided on the substrate can be employed. When performing gas detection, the temperature of the catalyst layer 3a can be kept constant by the heater 3b, or the temperature can be raised under predetermined conditions.

  The catalyst layer 3a includes a first catalyst component that includes a first catalyst carrier having a first rare earth element and electrical insulation, and a second catalyst carrier that includes a second catalyst carrier having a second rare earth element and electrical insulation. And at least a catalyst component. That is, the catalyst layer 3a contains first to nth catalyst components including a rare earth element and an electrically insulating catalyst carrier (n represents an integer of 2 or more). By increasing the number of catalyst components constituting the catalyst, it is possible to measure a fine spectral distribution and to identify many kinds of gases.

  Here, of the plurality of catalyst components, one arbitrarily selected catalyst component is denoted as catalyst component I, and one catalyst component arbitrarily selected from the remaining catalyst components is denoted as catalyst component II. The rare earth elements and catalyst carriers contained in these catalyst components are denoted as rare earth elements Ia and IIa and catalyst carriers Ib and IIb, respectively.

  When the catalyst layer 3a contains the catalyst components I and II, the rare earth element Ia and the rare earth element IIa are elements different from each other from the viewpoint of efficiently identifying the gas species by light emission from these catalyst components, and the catalyst carrier. It is preferable that Ib and the catalyst support IIb are different from each other. In some cases, the catalyst carrier Ib and the catalyst carrier IIb may be the same.

  The catalyst for forming the catalyst layer 3a can be obtained by preparing catalyst powders obtained by doping rare earth elements into the material forming the catalyst carrier and mixing them. The mixed powder may be formed into a slurry and applied onto a printed wiring board forming a heater to form the catalyst layer 3a, or the mixed powder may be sintered into a predetermined shape to form the catalyst layer 3a. May be.

  The rare earth elements that can be used in the present embodiment are La (lanthanum), Ce (cerium), Nd (neodymium), Pr (praseodymium), Sm (samarium), Eu (europium), Gd (gadolinium), Tb (terbium). , Dy (dysprosium), Ho (holmium), Er (erbium), Tm (thulium), Yb (ytterbium), Lu (lutetium), Sc (scandium) and Y (yttrium). Pm (promethium) is also classified as a rare earth element, but Pm is a radioactive element and is not actually present in nature. In the present embodiment, the rare earth element may be contained alone in one catalyst component, or two or more kinds may be contained.

Substances that can be used as the catalyst support include Al ₂ O ₃ (aluminum oxide), CaCO ₃ (calcium carbonate), ZrO ₂ (zirconium oxide), BaSO ₄ (barium sulfate), Si ₃ N ₄ (silicon nitride), SiC (Silicon carbide), BN (boron nitride), AlN (aluminum nitride) and B ₄ C (boron carbide). In one catalyst component, the above substance may be used alone as a catalyst carrier, or two or more kinds may be mixed and used.

What is necessary is just to set suitably the doping amount of the rare earth element with respect to a catalyst support | carrier according to the use of the light emitting element 3, or required performance. In addition, when doping a trivalent rare earth element into a catalyst support containing a divalent cation (for example, BaSO ₄ , CaCO ₃ ), a monovalent cation (for example, the same amount as the rare earth element) is used for charge compensation. It is preferred to dope the catalyst support with Na).

  Each catalyst component contained in the catalyst preferably further contains a metal element (combustion catalyst) that promotes the oxidation reaction of the combustible gas contained in the inspection target gas. By promoting the oxidation reaction of the combustible gas, there is an effect that the response speed of the light emitting element 3 is further improved. Here, when the catalyst component I contains the metal element Ic and the catalyst component II contains the metal element IIc, the metal element Ic and the metal element IIc are not necessarily different from each other. May be the same.

  The metal species that can be used as the combustion catalyst in the present embodiment are noble metals such as Pt (platinum), Pd (palladium), Rh (rhodium), Ir (iridium), Au (gold), Sn (tin), Fe (iron) ) Etc. What is necessary is just to set suitably the load of the said metal element with respect to a catalyst support | carrier according to the use of the light emitting element 3, or required performance.

  The optical filter unit 6 has a plurality of band pass filters (not shown) each corresponding to the peak wavelength to be detected. Inherent emission spectra emitted from the rare earth elements can be separated.

  The photodetector 7 is for detecting light emitted from the light emitting element 3. As the photodetector 7, a photomultiplier tube or the like can be employed. When light enters the photodetector 7 through the optical filter unit 6, an electrical signal is output from the photodetector 7. The electrical signal from the photodetector 7 is sent to the analysis unit 8, where gas type identification and other analysis (gas concentration, etc.) are performed.

<Gas detection method>
Next, a gas detection method using the gas detection device 10 will be described. In the gas detection method according to the present embodiment, a catalytic oxidation reaction of a flammable gas is caused by bringing a gas to be inspected containing a flammable gas into contact with the catalyst layer 3a of the light emitting element 3, and the rare earth is generated by this catalytic oxidation reaction. A step of measuring an emission spectrum generated from the element by the photodetector 7.

  In introducing the inspection target gas into the gas detection cell 1, it is preferable to cause a laminar flow of the inspection target gas in the flow path 4 from the viewpoint of achieving a high response speed. Therefore, although it depends on the size of the gas detection cell 1, it is preferable that the inspection target gas has a flow rate of 100 ml / min or less.

  When a combustible gas and oxygen are supplied to the catalyst layer 3a containing a rare earth element, these molecules are adsorbed on the surface of the catalyst layer 3a. Then, the electrons and holes generated from the adsorbed combustible gas molecules and oxygen molecules respectively move in the catalyst layer 3a, and when these recombine via the rare earth metal, the electron level state inherent to the rare earth element is reflected. Emission spectrum is produced. The intensity of the emission spectrum based on this emission mechanism is proportional to the amount of the reaction product generated by the catalytic reaction, while the type and amount of the reaction product generated depend on the type and concentration of the detection target gas. . Therefore, if the intensity of the emission spectrum unique to the rare earth element is measured, the concentration of the combustible gas contained in the inspection target gas can be known.

  As described above, the gas detection method according to the present embodiment involves an oxidation reaction of a combustible gas. Therefore, when the gas to be identified does not contain oxygen, the gas and the oxygen-containing gas (typically Is mixed with air) to prepare a gas to be inspected in advance.

  In order to detect a plurality of combustible gases contained in the gas to be inspected using the gas detection device 10, first, the temperature of the catalyst layer 3a is raised to about 500 ° C. by the heater 3b. However, this temperature may be changed depending on the inspection object gas. Thereafter, the inspection target gas is introduced into the gas separation unit 2, and a plurality of combustible gases are separated by the gas separation column. A plurality of combustible gases discharged together with the carrier gas (air) from the gas separation unit 2 are sequentially introduced into the flow path 4 through the gas introduction path 4a. Then, the oxidization reaction of the combustible gas sequentially occurs in the catalyst layer 3a of the light emitting element 3, and the light emission having a different emission spectrum occurs for each combustible gas.

  Since the catalyst layer 3a contains a plurality of catalyst components (rare earth elements), the emission spectrum radiated from the catalyst layer 3a is measured by the photodetector 7, thereby obtaining emission spectrum data different for each combustible gas. it can. By comparing with emission spectrum data measured in advance for various gas types, the type of combustible gas contained in the inspection target gas can be identified. Further, the concentration of the combustible gas can be obtained based on the emission intensity measured by the photodetector 7.

  As described above, since the gas detection device 10 includes the gas detection cell 1 having the flow path 4, the flow of the inspection target gas in the flow path 4 is changed into a laminar flow, thereby In this case, gas retention is suppressed, and a high response speed can be achieved. Furthermore, since the light emitting element 3 and the photodetector 7 can be disposed sufficiently close to each other, the detection sensitivity can be improved. Further, since the flow path 4 is flattened, the heat of the heater 3b for heating the catalyst layer 3a is easily transmitted to the inner wall surface of the flow path 4 and the light detection opening. It is possible to sufficiently suppress the attachment of the reactive gas and the reaction product. Therefore, high detection sensitivity can be sufficiently maintained, and the frequency of disassembly and washing the inside can be reduced. In addition, since the flow path 4 is extremely flat and the gas detector 10 has only one light-emitting element and one photodetector required for gas detection, the gas detector 10 can be sufficiently thinned and miniaturized.

  In addition, when the photodetector 7 is overheated by the heater 3b of the light emitting element 3, an air layer is provided between the gas detection cell 1 and the photodetector 7, or a heat insulating material is inserted to provide heat insulation. What is necessary is just to raise sex. However, when it is not necessary to raise the temperature of the gas detection cell 1 as a whole (when the gas detection cell 1 is exclusively used for detecting a gas that is difficult to be adsorbed on the solid surface), heat from the heater 3b to the main body of the gas detection cell 1 is used. As shown in FIG. 2, a hollow portion 9 may be provided below the heater 3b so as to reduce the conduction, thereby reducing the contact area between the two, or reducing the thickness of the protective layer 5a.

  The light emitting element 3 of the gas detection device 10 includes a catalyst layer 3a composed of a plurality of catalyst components having different gas sensitivity characteristics. A catalytic chemical sensor that produces a desired spectrum for a specific gas can be produced by appropriately selecting the type and number of catalyst components that constitute the catalyst layer 3a. Further, by adjusting the ratio of various catalyst components to be mixed, the intensity ratio of the catalyst emission peak can be freely designed, so that the sensitivity to a specific combustible gas component can be freely selected. Moreover, the light-emitting element 3 can be manufactured by a relatively easy method of appropriately selecting the catalyst component so that different spectra are generated depending on the gas type.

  As described above, the catalytic chemiluminescent element can originally achieve all of the linearity and reproducibility of the sensor output with respect to the gas concentration, and the response speed to a high level. It has features. Therefore, by using the gas detection device 10 as a detector of a gas chromatograph, gas separation and quantitative analysis similar to GC / MS can be performed. Moreover, since the gas detection apparatus 10 can identify various combustible gases, it can be applied to an odor sensor or the like.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the catalyst layer 3a composed of a plurality of catalyst components containing different rare earth elements is exemplified. However, depending on the use or required performance of the gas detection device, rare earth elements or the like may be used instead of the catalyst layer 3a. A catalyst layer containing only one kind of the luminescent material may be adopted, and a plurality of such catalyst layers may be arranged side by side in the flow path 4. By installing a plurality of light-emitting elements and various optical filters according to the purpose in the gas detection cell, qualitative and quantitative analysis can be performed without separating each component by the gas separation unit 2.

  Furthermore, in the said embodiment, although the case where several combustible gas was contained in the test object gas was illustrated, you may use the gas detection apparatus 10 in order to identify the kind of single combustible gas. In this case, the gas to be inspected may be directly introduced into the gas detection cell 1 without using the gas separation unit 2.

  Although the gas detection cell 1 of the above embodiment forms a dark box of the light emitting element 3, a dark box that accommodates the gas detection cell 1 may be further prepared. By accommodating the gas detection cell 1 in the dark box, stray light other than the light emitting component of the light emitting element 3 can be more reliably prevented when performing gas detection.

  In the above embodiment, the case where the protective layers 5a and 5b are provided in the region heated by the heat of the heater 3b is exemplified. However, depending on the temperature condition, the protective layer 5b may be provided as in the gas detection cell 21 illustrated in FIG. It is possible to provide only the protective layer 5a in contact with the light emitting element 3 (second embodiment). Further, from the viewpoint of further preventing the gas from adsorbing to the inner wall surfaces of the flow path 4, the gas introduction path 4a, and the gas discharge path 4b as in the gas detection cell 31 illustrated in FIG. The whole may be covered with protective layers 5a, 5b (third embodiment). Furthermore, like the gas detection cell 41 shown in FIG. 5, the entire main body 41a of the gas detection cell may be formed of a material having high heat resistance (fourth embodiment).

  As shown in FIG. 5, when the entire body 41 a of the gas detection cell 41 is formed of a heat resistant material, the material is a required item such as workability, price, gas durability, heat resistance, and light shielding properties. Can be appropriately selected from metal, resin, rubber, ceramics, glass and the like.

  EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to these Examples.

Example 1
An apparatus having the same configuration as that of the gas detection apparatus shown in FIG. 2 was prepared, and a catalytic chemiluminescent element having a catalyst layer containing a rare earth element was disposed in the flow path in the gas detection cell. However, in this example, since the inspection target gas was obtained by adding only ethanol gas to the air, the inspection target gas was directly introduced into the gas detection cell without passing through the gas separation unit.

  After setting the temperature of the catalyst layer to 450 ° C., the inspection target gas was supplied to the catalyst layer at a flow rate of 100 ml / min. In order to evaluate the response speed of gas detection, in this example, after supplying a gas to be inspected with a constant ethanol gas concentration for a predetermined time, the ethanol concentration was changed stepwise. Specifically, first, supply of a gas (air) having an ethanol concentration of 0 ppm was started, and thereafter, an inspection target gas having an ethanol concentration different from 19 ppm, 38 ppm, 57 ppm, 76 ppm, 95 ppm, 19 ppm, and 0 ppm was sequentially supplied. FIG. 7A is a graph showing the light detection intensity measured in this example.

(Comparative Example 1)
The response speed of gas detection was evaluated in the same manner as in Example 1 except that the conventional gas detection device having the configuration shown in FIG. 6 was used. That is, in this comparative example, a gas inspection cell in which an internal space is partitioned by a separation wall having a communication port for spraying a gas to be inspected onto the catalytic chemiluminescent element was used. FIG. 7B is a graph showing the light detection intensity measured in this comparative example.

  As is clear from the graph shown in FIG. 7, when compared with the gas detection device according to Comparative Example 1, the gas detection device according to Example 1 has a light detection intensity that changes in a stepped manner as the ethanol concentration is changed. It was confirmed that a high response speed can be achieved. Further, comparing the scales of the vertical axes (light detection intensities) of the two graphs in FIG. 7, the maximum value of graph (b) is 30 (kcps), whereas graph (a) has a maximum value of 100 ( It was confirmed that the gas detection apparatus according to Example 1 can also achieve high detection sensitivity.

(Example 2)
The light detection intensity was measured in the same manner as in Example 1 except that the flow rate of the inspection target gas was 10 ml / min, and the linearity of the sensor output was evaluated. The results of Examples 1 and 2 are shown in FIG.

  As is apparent from the graph shown in FIG. 8, in both Example 1 (flow rate 100 ml / min) and Example 2 (flow rate 10 ml / min), the ethanol gas concentration and the light detection intensity are almost proportional to each other. confirmed. Even when the flow rate of the gas to be inspected is as low as 10 ml / min, such a proportional relationship is maintained. Therefore, the gas detection cell according to the present invention sets the analysis gas introduction mechanism and the discharge mechanism to a low flow rate. Therefore, it is extremely effective for downsizing a portable gas detection device and the like.

1 is a perspective view showing a first embodiment of a gas detection cell according to the present invention. It is sectional drawing which shows the gas detection apparatus provided with the cell for gas detection shown in FIG. It is sectional drawing which shows 2nd Embodiment of the cell for gas detection which concerns on this invention. It is sectional drawing which shows 3rd Embodiment of the cell for gas detection which concerns on this invention. It is sectional drawing which shows 4th Embodiment of the cell for gas detection which concerns on this invention. It is sectional drawing which shows the conventional gas detection apparatus which concerns on the comparative example 1. (A) And (b) is a graph which shows the measurement result of the optical detection intensity in Example 1 and Comparative Example 1, respectively. It is a graph which shows the measurement result of the optical detection intensity in Example 1,2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Gas detection cell, 2 ... Gas separation unit (gas supply means), 3 ... Light emitting element (catalytic chemiluminescent element), 3a ... Catalyst layer, 3b ... Heater, 4 ... Flow path, 4a ... Gas introduction path, 4b DESCRIPTION OF SYMBOLS ... Gas exhaust path, 5a, 5b ... Protective layer, 5c ... Glass plate, 6 ... Optical filter unit, 7 ... Photodetector, 8 ... Analysis unit, 9 ... Cavity part, 10 ... Gas detection apparatus.

Claims (2)

A catalytic chemiluminescent device that emits light by a catalytic oxidation reaction of a combustible gas contained in a gas to be inspected;
A flow path formed in parallel to the surface of the catalyst layer of the catalytic chemiluminescent device and exposing the catalyst layer;
A heater for heating the catalyst layer;
A gas detection cell comprising: A gas detection cell according to claim 1;
Gas supply means for supplying the inspection object gas to the catalyst layer through the flow path;
Spectrum measuring means for measuring an emission spectrum generated by a catalytic oxidation reaction of the combustible gas in the catalyst layer;
A gas detection device comprising:

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