JP6523840B2 - Gas component detector - Google Patents

Description

  The present invention relates to a gas component detection device that detects the presence or absence of a predetermined component in a gas.

In recent years, a system for removing harmful substances such as mercury contained in exhaust gas from a combustion plant etc. is known. For example, a system is known that detects the concentration of mercury contained in the exhaust gas flowing through the flue and inserts activated carbon into the flue to remove mercury when the detected concentration of mercury exceeds a predetermined concentration. There is.
In order to detect mercury in the exhaust gas in the above-mentioned system, a mercury analyzer which measures the concentration of mercury from the amount of absorption of mercury in the exhaust gas as disclosed in Patent Document 1, for example, is used.

JP, 2014-126511, A

  However, in the conventional mercury analyzer, since exhaust gas is sampled to a light absorption cell etc. and the concentration of mercury is measured, it takes time to determine the presence or absence of mercury. As a result, when the conventional mercury analyzer is applied to the above system, there is a time lag between the generation of the exhaust gas containing mercury and the introduction of the activated carbon. Therefore, in order to stop the exhaust gas containing mercury from being discharged from the flue, a mechanism to compensate for the time lag is separately required. That is, the configuration of the system is complicated. Therefore, in the above system, a device capable of detecting mercury in a short time is desired.

  An object of the present invention is to perform detection of a component in a gas in a short time in a gas component detection device that detects the component contained in the gas based on the light absorption amount of the component.

Below, a plurality of modes are explained as a means to solve a subject. These aspects can be arbitrarily combined as needed.
The gas component detection device according to the first aspect of the present invention is a device for detecting the presence or absence of a detection target component contained in the gas flowing in the duct. The gas component detection device includes a light source, a detection unit, and a signal output unit.
The light source emits measurement light into the duct that includes at least a wavelength range that interacts with the component to be detected. The detection unit detects detection light that has been scattered and / or reflected by light scattering particles present in the inner wall of the duct and / or in the duct, of the measurement light. The signal output unit outputs a determination signal used to determine whether the gas flowing in the duct contains a detection target component based on the intensity of the detection light detected by the detection unit.
This makes it possible to detect the detection target component in the gas in a short time without sampling the gas flowing through the duct. As a result, a signal for determining the presence or absence of the detection target component in the gas can be output in a short time.

The detection unit may have a first detection unit that detects interaction component light that is light of a wavelength range that interacts with the detection target component among the detection light. At this time, the signal output unit outputs a signal including information on the intensity of the interaction component light as a determination signal.
As a result, it is possible to output, as a determination signal, a signal necessary to determine whether the gas flowing through the duct contains the component to be detected.

It may be determined that the gas flowing in the duct includes the detection target component when the temporal change amount of the intensity of the interaction component light becomes equal to or more than the first value.
Thereby, the presence or absence of a detection target component can be determined in a short time from only one type of signal.

The detection unit may further include a second detection unit that detects background light that is light of a wavelength range that is not affected by the presence of the detection target component among the detection light. In this case, the signal output unit outputs a signal further including information on the intensity of background light as a determination signal.
Thereby, the influence by other than the detection target component and the influence by the presence of the detection target component can be simultaneously measured, and such information can be included in the determination signal.

It may be determined that the gas flowing in the duct contains the detection target component if the difference between the intensity of the interaction component light and the intensity of the background light is equal to or greater than the second value.
Thereby, the detection target component can be detected with high accuracy from the signal including only the influence of the presence of the detection target component.

The above-described gas component detection device may further include a light collecting unit that connects the focal point to the inner wall of the duct. At this time, the signal output unit outputs a signal capable of calculating the concentration of the detection target component based on the intensity of the component reflected and / or scattered from the inner wall of the duct among the detection light.
Thus, even when the gas flowing through the duct contains substantially no light scattering particles, the detection light can be detected. Moreover, the optical path length in the duct of the measurement light can be uniquely determined. As a result, not only the presence or absence of the component to be detected but also the concentration thereof can be measured.

  The light source may be selected from a xenon lamp, an LED or a laser diode. Thereby, light of an appropriate wavelength range can be generated.

  The detection target component contained in the gas can be detected in a short time based on the absorption amount of the measurement light by the detection target component.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the structure of the gas component detection apparatus which concerns on 1st Embodiment. FIG. 16 shows an emission spectrum of a xenon lamp. The figure which shows the structure of a control part. The figure which shows the state which connected the focus to the inner wall. The figure which shows the method of determining the presence or absence of mercury by the difference of 1st intensity | strength and 2nd intensity | strength. The figure which shows the structure of the gas analyzer which concerns on 2nd Embodiment. The figure which shows the method of determining the presence or absence of mercury only from 1st intensity | strength. The figure which shows the structure of the gas component detection apparatus which concerns on 3rd Embodiment.

(1) First Embodiment (1-1) Configuration of Gas Component Detection Device The configuration of a gas component detection device 100 according to the present embodiment will be described with reference to FIG. FIG. 1 is a diagram showing the configuration of the gas component detection device according to the first embodiment. The gas component detection device 100 according to the present embodiment is a device for detecting mercury (an example of the detection target component) in the exhaust gas SG flowing through the flue 50 (an example of a duct) such as an incinerator or a chemical plant.
The gas component detection device 100 includes a housing 1. The housing 1 forms the main body of the gas component detection device 100. Further, a flange portion 1 a is formed at the opening O 1 of the housing 1. The flange portion 1 a is connected to the flange portion 51 a formed in the opening O 2 of the side wall 51 of the flue 50. Thus, the housing 1 is fixed to the side wall 51 in a state where the internal space S of the housing 1 and the flue 50 are connected.

The gas component detection device 100 includes a light source 3. The light source 3 generates measurement light L _m which at least includes a wavelength range that interacts with mercury. In the present embodiment, the light source 3 is disposed immediately below the light path changing member 31 in the internal space S of the housing 1. Accordingly, the measurement light L _m generated from the light source 3 is reflected by the reflection surface of the optical path changing member 31, it is introduced into the flue 50.

In this case, for example, the reflecting surface of the optical path changing member 31 as a concave or convex, and either or condensed extend the measurement light L _m generated from the light source 3 may be introduced into the flue 50. For example, when the measurement light L _m is irradiated toward the light scattering particle P such as dust contained in the gas flowing in the flue 50, the measurement light L _m can be spread and introduced. On the other hand, when the measurement light L _m is irradiated toward the inner wall 51 ′ (described later) of the flue 50, the measurement light L _m can be collected and introduced.

In the present embodiment, the light source 3 is a xenon lamp. As shown in FIG. 2, the xenon lamp can generate light in a wide wavelength range of 190 nm to 600 nm. FIG. 2 is a diagram showing an emission spectrum of the xenon lamp. As a result, as described later, by arranging an appropriate band pass filter on each light receiving surface of a plurality of detection units (described later), light of a plurality of wavelength ranges can be simultaneously detected using one light source.
In addition, as the light source 3, a mercury lamp, an LED capable of generating light in the ultraviolet region, a laser diode (LD) or the like can be used.

The gas component detection device 100 includes a detection unit 5. The detection unit 5 detects a detection light L _d (described later). In the present embodiment, the detection unit 5 detects the interaction component light L _d1 which is light of a wavelength range (about 254 nm (FIG. 2)) which is absorbed (an example of interaction) in the detection light L _d . A first detection unit 5a and a second detection unit 5b that detects background light _Ld2 that is light in a wavelength range (for example, around 470 nm (FIG. 2)) that does not interact with mercury are included.

The first detection unit 5a is a photodiode or a photomultiplier capable of detecting light in the ultraviolet region. The first detection unit 5a is farther from the flue 50 than the light path changing member 31 on the light path axis A (FIG. 1) where the measurement light L _m is introduced into the flue 50 in the internal space S of the housing 1 Placed in position. For first detector 5a is possible to detect only the interaction component light L _d1, the light receiving surface of the first detector 5a, the first band pass filter BP1 which can transmit only interaction component light L _d1 is It is arranged.
Thereby, the first detection unit 5a can detect, for example, light of a wavelength range of ± 5 nm (for example, 254 nm ± 5 nm) centered on a wavelength absorbed by mercury as the interaction component light L _d1 .

On the other hand, the second detection unit 5b is a photodiode or a photomultiplier capable of detecting the background light _Ld2 . The second detection unit 5 b is disposed at a position where the light split by the beam splitter BS disposed between the first detection unit 5 a and the optical path changing member 31 can be detected in the internal space S of the housing 1 There is. For the second detector 5b is possible to detect only the background light L _d2, the light-receiving surface of the second detector 5b, the second bandpass filter BP2 only background light L _d2 that can transmit is arranged ing.
Thereby, the second detection unit 5b can detect, for example, light of a wavelength range of ± 5 nm (for example, 470 nm ± 5 nm) centered on a wavelength that does not interact with mercury as the background light _Ld2 .

Since the detection unit 5 includes the first detection unit 5a and the second detection unit 5b, the interaction component light L _d1 and the background light L _d2 can be simultaneously detected.

  The gas component detection device 100 includes a light collecting unit 7. The condensing part 7 focuses F at a predetermined position in the flue 50 using refraction or reflection. The condensing unit 7 is, for example, a lens or an assembly of lenses movable on the optical path axis A by a drive mechanism (not shown). In addition, the condensing part 7 can also be comprised by a concave mirror. The condenser 7 may be configured by a combination of a lens and a concave mirror. The condensing unit 7 is provided closer to the flue 50 than the detecting unit 5 in the internal space S of the housing 1 and on the side farther from the flue 50 than the light path changing member 31. Thereby, the condensing unit 7 can focus on a predetermined position in the flue 50.

As described above, by arranging the light source 3, the detection unit 5, and the light collecting unit 7 in one housing 1, the light source 3, the detection unit 5, and the light collecting unit 7 It is possible to suppress the positional relationship from shifting. As a result, it is possible to avoid that it becomes impossible to detect the detection light L _d in the detection unit 5.
As shown in FIG. 1, in the present embodiment, the housing 1 is fixed to the side wall 51 so as to be perpendicular to the flow of the exhaust gas SG in the flue 50. However, the present invention is not limited to this, and the housing 1 may be fixed to be oblique to the flow of the exhaust gas SG.

  The gas component detection device 100 includes a control unit 9. The control unit 9 controls each component of the gas component detection device 100. The control unit 9 outputs a signal necessary to determine whether the exhaust gas SG contains a component to be detected. The details of the control unit 9 will be described in detail later.

Gas component detection device 100 may include an optical window OW a member capable of transmitting the measurement light L _m and the detecting light L _d. The optical window OW is disposed to close the opening O1 of the housing 1. Thereby, it can be avoided that the light source 3, the detection unit 5, the light collecting unit 7 and the like are contaminated by the exhaust gas SG.
The gas component detection device 100 may include a purge gas introduction unit 10 that supplies the purge gas _GP near the optical window OW in the flue 50. Thereby, the contamination of the optical window OW due to the light scattering particles P can be suppressed.

(1-2) Configuration of Control Unit Next, the configuration of the control unit 9 will be described with reference to FIG. FIG. 3 is a diagram showing the configuration of the control unit. The control unit 9 is a computer system provided with a CPU, storage devices (RAM, ROM and the like), and various interfaces such as an A / D and D / A converter. Some or all of the functions of the control unit 9 described below may be realized by a program operable by the computer system. The program may be stored in a storage device. Some or all of the functions of the control unit 9 may be realized by a custom IC.

The controller 9 has a light source controller 91. The light source control unit 91, based on the light source control command from outside, the operation start and stop and the light source 3 to control the intensity of the measurement light L _m.
The control unit 9 includes a light collection control unit 93. The focusing control unit 93 moves the lens and / or the concave mirror of the focusing unit 7 on the optical path axis A based on a focusing control command from the outside.

The control unit 9 has a signal output unit 95. The signal output unit 95 outputs a determination signal capable of determining whether the exhaust gas SG contains mercury. Specifically, the signal output unit 95 converts the electric signal (voltage value or current value) based on the intensity of the detection light L _d detected by the detection unit 5 into numerical data indicating the intensity of the detection light L _d , etc. It converts and outputs the said numerical data outside as a determination signal.

Signal output unit 95 based on the intensity of the detection light L _d, may generate a calculated possible signal the concentration of mercury in the exhaust gas SG has become possible output. This enables not only detection of the presence or absence of mercury in the exhaust gas SG but also measurement of the mercury concentration.

With the control unit 9 having the above configuration, the gas component detection device 100 can output a signal capable of determining the presence or absence of mercury to the outside.
The control unit 9 may have the determination unit 97. Based on the determination signal from signal output unit 95, determination unit 97 determines whether or not mercury is contained in exhaust gas SG, and outputs the determination result to the outside as a detection signal. The specific determination method of the presence or absence of mercury is demonstrated in detail later.
In this embodiment, the determination unit 97 is disposed in the control unit 9, but the determination unit 97 is provided in a system external to the control unit 9, and the control unit 9 outputs a determination signal to the external system. You may do so.

(1-3) Operation of Gas Component Detection Device Next, the operation of the gas component detection device 100 according to the present embodiment will be described. Before the start of the detection of mercury, first, the light collecting unit 93 is controlled by the light collecting control unit 93 to focus on a desired position in the flue 50. The position of the focal point F is set, for example, on the front side of the flue 50 (the side on which the housing 1 is attached) when the concentration of the light scattering particles P in the exhaust gas SG is high. It is set on the back side of the flue 50.
In addition, when the light scattering particles P are scarcely present in the exhaust gas SG, as shown in FIG. 4, the focal point F is connected to the surface on the side of the flue 50 of the side wall 51 (referred to as inner wall 51 '). FIG. 4 is a view showing a state in which the focal point is connected to the inner wall. Thus, also the light scattering particles P to scatter measurement light L _m is a case where there is little, can detect the measurement light L _m which has passed through the flue 50 and reflected by the inner wall 51 'as the detection light L _d .

Further, the optical path length of the measurement light L _m reflected by the inner wall 51 'can be determined uniquely. Therefore, by detecting the measurement light L _m reflected by the inner wall 51 'as the detection light L _d, the intensity of the detection light L _d, it can be measured mercury concentration in the exhaust gas SG at the same time.
The optical path length of the measurement light L _m reflected by the inner wall 51 ', in the case of not introducing a purge gas G _P in the vicinity of the optical window OW from the connection portion between the flange portion 1a and the flange portion 51a, a flange portion 1a, 51a The distance W ₁ (FIG. 4) to the inner wall 51 ′ on the opposite side to the connection portion of the second part is twice (2 W ₁ ).
On the other hand, when the purge gas GP is introduced in the vicinity of the optical window OW, the optical path length of the measurement light L _m reflected by the inner wall 51 ′ is twice the width W ₂ (FIG. 4) of the flue 50 (2W ₂ ) It becomes. This is because when the purge gas GP is introduced, almost no exhaust gas SG exists in the space portion of the flange portion 51a.

Thereafter, the light source control unit 91 controls the light source 3 to irradiate the measurement light L _m into the flue 50. Measurement light is introduced into passage 50 in the smoke L _m is a portion during passage through the flue 50 is absorption by the mercury in the exhaust gas SG. The measurement light L _m is also scattered and / or reflected by the light scattering particles P and / or the inner wall 51 ′ contained in the exhaust gas SG. As a result, the measurement light L _m is changed its traveling direction in the flue 50, a portion is returned to the casing 1. Detection unit 5, the measurement light L _m that has returned to the housing 1 without being absorption by mercury during passage through the flue 50, is detected as a detection light L _d. The detection light L _d mainly includes the measurement light L _m collected by the light collecting unit 7 and returned to the housing 1 from the focal point F to the opening O 2 of the flue 50.

When the detection light L _d is detected by the detection unit 5, the signal output unit 95 generates a determination signal for determining the presence or absence of mercury, and outputs the determination signal to the outside. In the embodiment, a signal containing information about the first intensity I _d1 of the interaction component light L _d1, and information about the second intensity I _d2 background light L _d2 is generated as the determination signal.

Next, based on the determination signal input from the signal output unit 95, the determination unit 97 or an external system determines whether mercury is contained in the exhaust gas SG. In the present embodiment, the presence or absence is determined from information including only the influence of mercury. For example, as shown in FIG. 5, a second intensity _{I d2} is the difference _I d2 _{-I d1} between the first intensity _{I d1,} when a second value Th2 above, contain mercury in the exhaust gas SG It is determined that FIG. 5 is a diagram showing a method of determining the presence or absence of mercury based on the difference between the first intensity and the second intensity.

The ratio of the two intensities (e.g., I _d1 / I _d2 ) may be used as the difference between the second intensity I _d2 and the first intensity I _d1 . The second value Th2 is preferably set to an appropriate value based on the definition of the difference between the second strength I _d2 and the first strength I _d1 .

On the other hand, in the case where the concentration of mercury is also measured by detecting the measurement light L _m reflected and / or scattered by the inner wall 51 ′ as the detection light L _d , for example, the signal output unit 95 measures the first intensity I _d1. And the second intensity I _d2 (I _d1 / I _d2 ) is output to the outside as a signal capable of calculating the concentration of mercury. Thereby, the control unit 9 or an external system sets the optical path length to 2W ₁ or 2W ₂ using the Lambert-Beer's law, and the signal which can calculate the concentration of the above-mentioned mercury input from the signal output unit 95 is mercury The concentration of mercury can be calculated by setting the light absorption amount by

As described above, it detects the measurement light L _m which can change the traveling direction without being absorbance mercury has returned to the housing 1 as the detection light L _d. Thus, without sampling the exhaust gas SG, at the timing the exhaust gas SG has passed through the optical path axis A of the measurement light L _m, can be immediately output the determination signal and / or the detection signal indicating the presence or absence of mercury.
By determining the presence or absence of mercury based on the difference between the second intensity I _d2 and the first intensity I _d1 , the presence or absence of mercury can be accurately determined from information including only the influence of the presence or absence of mercury.

(2) Second Embodiment In the first embodiment described above, the detection unit 5 includes the first detection unit 5a and the second detection unit 5b. However, the present invention is not limited to this, and in the gas component detection device 200 according to the second embodiment, as shown in FIG. 6, the detection unit 5 has only the first detection unit 5a. FIG. 6 is a diagram showing the configuration of the gas analyzer according to the second embodiment.
In this case, the signal output unit 95 generates a determination signal including only information about the first intensity I _d1 of the interaction component light L _d1 output.

In the second embodiment, the presence or absence of mercury is determined by determining whether the temporal change amount _{SD of} the first intensity I _d1 is due to the presence of mercury or due to other effects.
For example, as shown in FIG. 7, mercury is contained in the exhaust gas SG when the temporal change amount S _D (ΔI _d1 / ΔT) of the first intensity I _d1 becomes equal to or more than the first value Th1. It is determined that FIG. 7 is a view showing a method of determining the presence or absence of mercury only from the first intensity. In this case, the first value Th1 is preferably a value larger than the maximum value of the temporal change amount of the second intensity _{I d2} of background light _{L d2 S B (ΔI d2 /} ΔT).
In addition, it may be determined that mercury is contained in the exhaust gas SG when the state in which the temporal change amount _SD is the first value Th1 or more continues for a predetermined time or more.
Thus, the presence or absence of mercury in the exhaust gas SG can be determined in a short time only from the information on the first intensity _Id1 .

(3) Third Embodiment In the first and second embodiments described above, the measurement light L _m is introduced perpendicularly to the flow of the exhaust gas SG, and the detection unit 5 detects the flow of the exhaust gas SG. the measurement light L _m which has returned to the vertical direction are detected as the detection light L _d.
However, the present invention is not limited thereto, and in the gas component detection device 300 according to the third embodiment, as shown in FIG. 8, the measurement light L _m is at a first angle θ ₁ with respect to the direction perpendicular to the flow of the exhaust gas SG. Has been introduced with an angle of. Detector 5 detects the measuring light L _m which has returned a second angle theta ₂ of the angle with respect to a direction perpendicular to the flow of the exhaust gas SG as detection light L _d. FIG. 8 is a view showing the configuration of a gas component detection device 300 according to the third embodiment.
In the above case, in order to detect the intense detection light L _d of from intensity by the detector 5, preferably equal first angle theta ₁ and the second angle theta _2. The first angle theta ₁ and the second angle theta _2, respectively, may be made adjustable.

By shifting the introduction angle of the measurement light L _m and the detection angle of the detection light L _{d from} the angle perpendicular to the flow of the exhaust gas SG, the light path length in the flue 50 of the measurement light L _m is scattered It can be determined relatively easily by simulation or the like. As a result, mercury detection and concentration measurement can be performed simultaneously.
Further, when the introduction angle of the measurement light L _m and the detection angle of the detection light L _d are shifted from the angle perpendicular to the flow of the exhaust gas SG, the light source 3 and the detection unit 5 (and the light collecting unit 7) Can be housed in separate housings, each attached separately to the side wall 51.

(4) Other Embodiments Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. . In particular, the embodiments and modifications described herein may be arbitrarily combined as needed.
(A) Other Embodiments of Detection Target Component In the above first to third embodiments, mercury is used as the detection target component, but the interaction component light L _d1 detected by the detection unit 5 and / or the background By appropriately changing the wavelength range of the light L _d2 , other components such as nitrogen oxide (NOx), sulfur oxide (SOx), water, carbon monoxide (CO), and the like can be used as detection target components.

(B) In another embodiment the first through third embodiments described above for the control of the light source, the light source 3 had occurred the measurement light L _m temporally unchanged wavelength range. However, the present invention is not limited to this, and particularly when the light source 3 is configured by a laser such as an LD, the wavelength range of the measurement light L _m can be changed by temporally changing the current / voltage input to the LD as the light source 3. It can change over time. In this case, the first band pass filter BP1 and / or the second band pass filter BP2 become unnecessary.
In the case where the wavelength range of the measurement light L _m is temporally changed by LD or the like, the interaction component light L _d1 and the background light L _d2 are each centered on, for example, a wavelength that interacts with the measurement target component. The light of the wavelength range of ± 0.5 nm and the light of the wavelength range of ± 0.5 nm centering on the wavelength which does not interact with the component to be measured can be used.

  The present invention can be widely applied to a gas component detection device that detects components contained in gas based on the amount of light absorption.

100, 200, 300 Gas Component Detector 1 Housing 1a Flange 3 Light Source 31 Optical Path Changer 5 Detector 5a First Detector 5b Second Detector 7 Condenser 9 Controller 91 Light Source Controller 93 Condenser Controller 95 signal output unit 97 determination unit 10 purge gas introduction unit 50 flue 51 side wall 51 'inner wall O1, O2 opening 51a flange portion BP1 first band pass filter BP2 second band pass filter BS beam splitter OW optical window A optical path F focus P light scattering particle SG exhaust gas _GP purge gas L _m measurement light L _d detection light L _d1 interaction component light I _d1 first intensity L _d2 background light I _d2 second intensity S _B , _SD temporal change amount Th1 1 value Th2 second value theta ₁ first angle theta ₂ second angle _{W 1} distance _{W 2} flues width

Claims (8)

An apparatus for detecting the presence or absence of a detection target component contained in gas flowing in a duct, the apparatus comprising:
A light source for emitting measurement light into the duct, the measurement light including at least a wavelength range interacting with the detection target component;
A detector for detecting the detection light that has been scattered and / or reflected by different light scattering particles and present in the measurement light sac Chi before Symbol duct the detection target component,
A signal output unit that outputs a determination signal used to determine whether the gas flowing in the duct contains the detection target component based on the intensity of the detection light detected by the detection unit;
Gas component detection device equipped with The detection unit has a first detection unit that detects interaction component light that is light of a wavelength range that interacts with the detection target component among the detection light,
The signal output unit outputs a signal including information on the intensity of the interaction component light as the determination signal.
The gas component detection device according to claim 1 .   It is determined that the gas flowing in the duct contains the detection target component when the temporal change amount of the intensity of the interaction component light is equal to or more than a first value. The gas component detection device according to claim 1. The detection unit further includes a second detection unit that detects, among the detection light, background light that is light in a wavelength range that is not affected by the presence of the detection target component,
The signal output unit outputs a signal further including information on the intensity of the background light as the determination signal.
The gas component detection device according to claim 2.   The gas flowing in the duct is determined to contain the detection target component when the difference between the intensity of the interaction component light and the intensity of the background light is equal to or greater than a second value. The gas component detection device according to claim 4. The light source further includes a light collecting unit that connects the focal point of the measurement light to the inner wall of the duct.
The signal output section, based on the intensity and strength of the detection light reflected and / or scattered components from the inner wall of the measurement light sac Chi before Symbol duct, a possible signal calculate the concentration of the detection target component Output,
The gas component detection apparatus in any one of Claims 1-5.   The gas component detection device according to any one of claims 1 to 6, wherein the detection target component is mercury. The gas component detection device according to any one of claims 1 to 7, wherein the light source is selected from a xenon lamp, an LED, or a laser diode.

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