Gas measurement device and gas measurement method

Abstract

The gas measurement device (5) has: an absorbance measurement device (10) that irradiates detection light into a reaction vessel (2) that generates methane gas, and measures the absorbance of the detection light after passing through the gas environment inside the reaction vessel (2); an absorbance data analysis section (21) that performs spectral analysis on the data of the absorbance measured by the absorbance measurement device (10); a peak detection section (22) that detects a plurality of peak values from the spectrum of the absorbance analyzed by the absorbance data analysis section (21); and a pressure calculation section (23) that calculates the pressure inside the reaction vessel (2) based on the intensity ratio of the peak values of two points among the plurality of peak values detected by the peak detection section (22).

Description

Technical Field

[0001] This invention relates to a gas measuring device and a gas measuring method. Background Technology

[0002] Patent Document 1 discloses a gas concentration measuring device, characterized by comprising: a laser that oscillates a laser beam with a wavelength and intensity corresponding to the driving current and temperature; a wavelength stabilization device that modulates the driving power supply of the laser beam with an arbitrary amplitude at a specified temperature and with a specified current value, thereby stabilizing the laser beam at the center of the absorption line of a specific gas; a measuring gas cell that contains a specific gas to be measured and maintains the temperature of the specific gas constant; a photodetector that detects the intensity of transmitted light obtained by passing a laser beam of arbitrary amplitude through the measuring gas cell; and a measuring unit that performs phase-sensitive detection on a specific component in the signal from the detector and measures the concentration of the specific gas in the measuring gas cell based on the change in the detection signal corresponding to the modulation amplitude.

[0003] Patent Document 1: Japanese Patent Application Publication No. 5-256769 Summary of the Invention

[0004] However, for gases such as methane, if we focus on a single spectral line of the absorption spectrum, the absorption coefficient depends on the total atmospheric pressure. Therefore, there is a problem that, in the case of concentration measurement in places with drastic pressure changes, such as mines or factories, it is impossible to achieve accurate concentration measurement without setting up a pressure sensor to monitor the pressure and calibrating based on its value.

[0005] In the aforementioned prior art, instead of setting up a pressure sensor, a gas measuring cell is set up to contain the specific gas to be measured and to keep the temperature of the specific gas constant, thereby solving the above-mentioned problem. However, there is a problem that setting up a gas measuring cell will incur costs.

[0006] The present invention was proposed in view of the above-mentioned problems, and its purpose is to provide a gas measuring device and gas measuring method that can measure a specific gas in a reaction vessel with changing pressure without installing a pressure sensor.

[0007] One aspect of the present invention relates to a gas measuring apparatus comprising: an absorbance measuring device that irradiates detection light into a reaction vessel generating gas and measures the absorbance of the detection light after passing through the gas environment within the reaction vessel; an absorbance data analysis unit that performs spectral analysis on the absorbance data measured by the absorbance measuring device; a peak detection unit that detects a plurality of peak values ​​from the spectrum of the absorbance analyzed by the absorbance data analysis unit; and a pressure calculation unit that calculates the pressure within the reaction vessel based on the intensity ratio of the peak values ​​of two points among the plurality of peak values ​​detected by the peak detection unit.

[0008] Additionally, in one aspect of the gas measuring apparatus of the present invention, there may be: a gas concentration calculation unit that calculates the concentration of the gas based on the peak value of the absorbance at a specific wavelength resolved by the absorbance data analysis unit and the pressure inside the reaction vessel calculated by the pressure calculation unit; and a gas concentration output unit that outputs the concentration of the gas calculated by the gas concentration calculation unit.

[0009] In addition, in a gas measuring device according to one aspect of the present invention, a gas concentration output unit may be provided, which outputs the concentration of the gas calculated by the gas concentration calculation unit.

[0010] In addition, in a gas measuring device according to one aspect of the present invention, a data comparison unit may be provided, which compares the peak value of the absorbance and the concentration of the gas at a predetermined reference pressure, which are stored in advance, with the peak value of the absorbance.

[0011] In addition, in one aspect of the gas measuring device according to the present invention, the gas concentration calculation unit may have a peak value standardization unit, which converts the peak value of the absorbance at a specific wavelength resolved by the absorbance data analysis unit into the peak value at a predetermined reference pressure based on the pressure inside the reaction vessel calculated by the pressure calculation unit, and performs standardization. The data comparison unit compares the pre-stored table data corresponding to the peak value of the absorbance at the reference pressure and the gas concentration with the standardized peak value of the absorbance.

[0012] In another embodiment of the present invention, the gas measuring device may be configured such that the peak detection unit detects the peak values ​​of two adjacent points from the spectrum of absorbance resolved by the absorbance data analysis unit.

[0013] In addition, in a gas measuring device according to one aspect of the present invention, if the peak detection unit detects multiple groups of peak values ​​of two adjacent points within a specified wavelength range, the group with the largest difference in peak values ​​of the two adjacent points may be selected.

[0014] One aspect of the present invention relates to a gas measurement method comprising: an absorbance measurement step, wherein a detection light is irradiated into a reaction container generating gas, and the absorbance of the detection light after passing through the gas environment within the reaction container is measured; an absorbance data analysis step, wherein the absorbance data measured in the absorbance measurement step is subjected to spectral analysis; a peak detection step, wherein multiple peak values ​​are detected from the spectrum of the absorbance analyzed in the absorbance data analysis step; and a pressure calculation step, wherein the pressure within the reaction container is calculated based on the intensity ratio of the peak values ​​of two points among the multiple peak values ​​detected in the peak detection step.

[0015] The effects of the invention

[0016] According to one aspect of the present invention described above, it is possible to measure a specific gas without installing a pressure sensor inside a reaction vessel where the pressure changes. Attached Figure Description

[0017] Figure 1 This is a structural diagram of a methane generation apparatus according to one embodiment.

[0018] Figure 2 This is a curve representing an example of the absorption spectrum of methane gas involved in one embodiment.

[0019] Figure 3 It is a curve representing the relationship between the intensity ratio (I1 / I2) of the peak values ​​at two points involved in an embodiment and the pressure.

[0020] Figure 4 It is a graph showing the relationship between methane concentration and absorbance at various pressures involved in one embodiment. Detailed Implementation

[0021] Hereinafter, with reference to the accompanying drawings, the gas measuring apparatus and gas measuring method according to embodiments of the present invention will be described in detail. First, an overview of the embodiments of the present invention will be given, followed by details of the embodiments.

[0022] [summary]

[0023] In the gas concentration measuring apparatus of Patent Document 1, laser light emitted from a semiconductor laser is split by a light splitter and transmitted to a reference gas cell and a measuring gas cell. The light passing through the reference gas cell is received by a detector, and the received signal is transmitted to a bipolar constant current power supply via a lock-in amplifier and an integrator. Then, a positive or negative current flows from the bipolar constant current power supply to a Peltier element to control the temperature of the semiconductor laser, thereby stabilizing laser emission. The light passing through the measuring gas cell is received by a photodetector, and the received signal is sent to a lock-in amplifier and a lock-in unit. Next, through signal processing by a divider and a signal processing unit, the pressure is calculated, and the gas concentration is obtained.

[0024] As described above, conventional gas concentration measuring devices require a gas cell for measuring the gas. Furthermore, in order to control the output of the semiconductor laser, a reference gas and a gas cell for sealing the reference gas are also required in such devices.

[0025] In the gas measuring apparatus and method described in the embodiments of the present invention, detection light is irradiated into the reaction vessel where the gas is generated, and the absorbance of the detection light after passing through the gas environment inside the reaction vessel is measured. Next, the measured absorbance data is subjected to spectral analysis, and the peak values ​​at two points are detected from the analyzed absorbance spectrum. Then, the pressure inside the reaction vessel is calculated based on the intensity ratio of the peak values ​​at the two points. Therefore, the pressure can be estimated from the peak values ​​of the absorbance, thus eliminating the need for a pressure sensor. Furthermore, it is unnecessary to remove the pressure sensor associated with heat treatment for sterilization or similar purposes within the reaction vessel. Additionally, gas extraction, such as that performed by gas chromatography, is unnecessary, thus preventing the introduction of impurities into the reaction vessel. Moreover, the concentration of a specific gas can be accurately estimated within the reaction vessel where the pressure changes.

[0026] [Implementation Method]

[0027] Figure 1 This is a structural diagram of a methane generating apparatus 1 according to one embodiment.

[0028] like Figure 1 As shown, the methane generating device 1 includes a reaction vessel 2, a gas supply device 3, a generated gas extraction device 4, and a gas measuring device 5.

[0029] Reaction vessel 2 cultivates methanogenic bacteria in culture medium 6. Examples of methanogenic bacteria include *Methanobacterium alcaliphilum*, *Methanobacterium bryantii*, *Methanobacterium congolense*, *Methanobacterium defluvii*, *Methanobacterium espanolae*, *Methanobacterium formicicum*, *Methanobacterium ivanovii*, *Methanobacterium palustre*, *Methanobacterium thermaggregans*, *Methanobacterium uliginosum*, *Methanobrevibacter acididurans*, and *Methanobrevibacter*. *Methanobrevibacter arboriphilicus*, *Methanobrevibacter gottschalkii*, *Methanobrevibacter olleyae*, *Methanobrevibacter ruminantium*, *Methanobrevibacter smithii*, *Methanobrevibacter woesei*, *Methanobrevibacter wolinii*, *Methanothermobacter marburgensis*, *Methanothermobacter thermoautotrophicus*, *Methanobacterium thermoautotrophicus*, *Methanothermobacter thermoflexus*, *Methanothermobacter thermophilics*, *Methanothermobacter* Wolf. wolfeii, social methanothermusThe following bacteria are listed: *Methanocorpusculum bavaricum*, *Methanocorpusculum parvum*, *Methanoculleus chikuoensis*, *Methanoculleus submarinus*, *Methanogenium frigidum*, *Methanogenium liminatans*, *Methanogenium marinum*, *Methanomicrobium mobile*, *Methanocaldococcus jannaschii*, *Methanococcus aeolicus*, *Methanococcus maripaludis*, *Methanococcus vannielii*, *Methanococcus voltaei*, and *Methanothermococcus*. thermolithotrophicus) etc.

[0030] In this embodiment, the reaction vessel 2 is used to cultivate strains of Methanobacteriales, Methanomicrobiales, Methanocellales, and Methanomassillicoccales, among others, as methanogenic bacteria. These hydrogen-trophic methanogenic bacteria sometimes also exist in anaerobic groundwater. Methane can be obtained by adding a mixture of carbon dioxide (CO2) and hydrogen (H2) to the anaerobic groundwater containing the methanogenic bacteria. That is, the reaction vessel 2 stores the culture medium 6 (e.g., anaerobic groundwater) used to cultivate the methanogenic bacteria. The reaction vessel 2 is kept in an anaerobic state with minimal oxygen content.

[0031] Gas supply device 3 opens valve 3a to supply carbon dioxide and hydrogen required by the methanogenic bacteria to reaction vessel 2. The gas supply device introduces a mixed gas of H2 / CO2 (e.g., a volume ratio of 80 vol.%: 20 vol.%) into the gas phase of reaction vessel 2 and pressurizes it to the specified pressure to begin the cultivation of methanogenic bacteria.

[0032] Based on the measurement results from the gas measuring device 5, the generated gas extraction device 4 opens valve 4a to extract methane produced by methanogenic bacteria (e.g., hydrogen-trophic methanogenic bacteria). The generated gas is extracted from the gas phase portion within the reaction vessel 2 by the generated gas extraction device 4 and stored in an external container (not shown). Furthermore, after methane extraction is complete, valve 4a is closed, and an H2 / CO2 mixed gas is supplied back to the reaction vessel 2 from the gas supply device 3 to continue the cultivation of the methanogenic bacteria and methane production.

[0033] An inert gas can also be supplied to the reaction vessel 2 from the gas supply device 3 before the cultivation of methanogenic bacteria begins (before the H2 / CO2 mixed gas is supplied to the reaction vessel 2). The reaction vessel 2 can be set to an anaerobic state by supplying an inert gas (gas purging). Examples of inert gases include nitrogen, argon, and helium.

[0034] A stirring mechanism 8 is provided in the reaction vessel 2. This stirring mechanism 8 stirs and mixes the gas-liquid interface 7 of the culture medium 6 and the H2 / CO2 mixed gas (reaction gas). The stirring mechanism 8 has stirring blades that cause ripples at the gas-liquid interface 7 of the culture medium 6. This promotes the dissolution of the reaction gas into the culture medium 6. Alternatively, as long as the area of ​​the gas-liquid interface 7 can be increased, a mechanism that causes the reaction vessel 2 to vibrate itself can also be used.

[0035] Gas measuring device 5 measures and outputs the concentration of methane gas generated within reaction vessel 2. The measurement results of gas measuring device 5 are managed by peripheral devices of reaction vessel 2 (not shown), enabling long-term operation of methane generating device 1 (long-term methane generation). Gas measuring device 5 includes absorbance measuring device 10, information processing unit 11, and concentration output unit 12.

[0036] The absorbance measuring device 10 irradiates detection light into the reaction vessel 2 where methane gas is generated, and measures the absorbance of the detection light after it has passed through the gaseous phase portion containing gas within the reaction vessel 2, i.e., the gas environment within the reaction vessel 2 (absorbance measurement step). In this embodiment, the object of measurement is methane gas, and at least one of infrared and near-infrared light is preferably used as the detection light. However, the object of measurement is not limited to methane gas. When a specific gas other than methane gas is selected as the object of inspection, a detection light with a wavelength suitable for that specific gas can also be used.

[0037] The absorbance measuring device 10 can be, for example, a probe-type device that is inserted into the reaction vessel 2. The probe-type absorbance measuring device 10 has a light-emitting section and a light-receiving section on the base end of the probe, and a reflective section on the front end of the probe that reflects the detection light towards the base end. A vent is provided between the base end and the front end of the probe, allowing the detection light to be irradiated into the gas inside the reaction vessel 2 passing through the vent, and its absorbance to be measured.

[0038] The information processing unit 11 includes a device control unit 20, an absorbance data analysis unit 21, a peak detection unit 22, a pressure calculation unit 23, and a gas concentration calculation unit 24 (including a peak value standardization unit 24a and a data comparison unit 24b). They are functionally separate, but as physical components (hardware), they can be composed of the same device (e.g., a computing processing device such as a PC) or multiple devices.

[0039] The absorbance data analysis unit 21, peak detection unit 22, pressure calculation unit 23, and gas concentration calculation unit 24 process the measurement data from the absorbance measuring device 10. The device control unit 20 controls the operation of the absorbance measuring device 10 and, based on the processing results of the absorbance measuring device 10's measurement data, controls the operation of valve 3a of the gas supply device 3, valve 4a of the generated gas extraction device 4, or other peripheral devices of the reaction vessel 2 (not shown). Furthermore, during the reaction process, valves 3a and 4a can be closed, sealing the interior of the reaction vessel 2.

[0040] The absorbance data analysis unit 21 performs spectral analysis on the absorbance data measured by the absorbance measuring device 10 (absorbance data analysis process). Figure 2 This is a curve representing an example of the absorption spectrum of methane gas according to one embodiment. For example... Figure 2 As shown, the absorption spectrum of methane gas exhibits several characteristic peaks I1, I2, and I3 in the wavelength range from infrared to near-infrared.

[0041] The peak detection unit 22 detects the peak values ​​of two points from the absorbance spectrum resolved by the absorbance data analysis unit 21 (peak detection process). Specifically, the peak detection unit 22 detects the peak values ​​of two adjacent points, including the highest peak value I1, from the absorbance spectrum resolved by the absorbance data analysis unit 21. By detecting the peak values ​​of two adjacent points, the detection range of the absorbance spectrum can be narrowed, reducing the computational processing load. Furthermore, the peak values ​​can be detected from positions where the absorbance slope is zero or changes from + to -.

[0042] like Figure 2 As shown, when multiple groups of peak values ​​at two adjacent points are detected within a specified wavelength range (e.g., groups of I1 and I2, or groups of I1 and I3), the peak detection unit 22 selects the group (group of I1 and I2) where the difference between the peak values ​​at two adjacent points is the largest. This significantly increases the variation in the peak value intensity ratio (I1 / I2), which will be described later, thereby improving the accuracy of subsequent pressure estimation. Furthermore, if the specific wavelength exhibiting the characteristic peak value is known in advance, the group of peak values ​​at two points can also be determined from the group of that specific wavelength.

[0043] The pressure calculation unit 23 calculates the pressure inside the reaction vessel 2 based on the intensity ratio (I1 / I2) of the peak values ​​of the two points detected by the peak detection unit 22 (pressure calculation process). Figure 3 This is a curve representing the relationship between the intensity ratio (I1 / I2) of the peak values ​​at two points involved in one implementation method and the pressure. For example... Figure 3 As shown, the intensity ratio (I1 / I2) of the peak values ​​at the two points is correlated with the pressure. The pressure calculation unit 23 is based on... Figure 3 The relationship between the intensity ratio (I1 / I2) of the peak values ​​at the two points shown and the pressure is used to calculate the pressure at which the spectrum was obtained.

[0044] The gas concentration calculation unit 24 calculates the gas concentration (gas concentration calculation step) based on the peak value of absorbance at a specific wavelength (I2 in this embodiment) resolved by the absorbance data analysis unit 21 and the pressure inside the reaction vessel 2 calculated by the pressure calculation unit 23. Furthermore, the peak value of absorbance at the aforementioned specific wavelength can be I1, but it may be affected by another peak value I3 located nearby. Therefore, the gas concentration calculation unit 24 refers to I2.

[0045] The gas concentration calculation unit 24 includes: a peak value standardization unit 24a, which converts the peak value of absorbance at a specific wavelength (I2 in this embodiment) resolved by the absorbance data analysis unit 21 into the peak value at a predetermined reference pressure based on the pressure inside the reaction vessel 2 calculated by the pressure calculation unit 23, and performs standardization; and a data comparison unit 24b, which compares the pre-stored table data corresponding to the peak value of absorbance at the reference pressure and the gas concentration with the standardized peak value of absorbance.

[0046] Figure 4 This is a curve showing the relationship between methane concentration and absorbance at various pressures involved in one embodiment. For example... Figure 4 As shown, the methane concentration and absorbance exhibit a linear relationship with varying slopes depending on the pressure. That is, when the methane concentration is constant, the absorbance and pressure are in a constant ratio at each pressure. Therefore, the peak value normalization unit 24a can normalize the absorbance to a reference pressure (here, 1 atm), transforming the absorbance (I2 in this embodiment) into a peak value at 1 atm. Furthermore, the data comparison unit 24b contains a table storing the relationship between the calibration curves of methane concentration and absorbance at 1 atm, and the methane concentration is calculated based on the absorbance converted to 1 atm obtained from the peak value normalization unit 24a.

[0047] The concentration output unit 12 outputs the concentration of methane gas calculated by the gas concentration calculation unit 24 (gas concentration output process). The concentration output unit 12 is, for example, a display device. In addition, the concentration output unit 12 can output not only the concentration of methane gas, but also the pressure inside the reaction vessel 2 obtained during the calculation.

[0048] As described above, according to the gas measuring apparatus 5 of this embodiment, the pressure inside the reaction vessel 2 can be estimated by comparing the intensity ratio of the peak values ​​of two adjacent absorbance points in the absorbance spectrum. Therefore, the pressure inside the reaction vessel 2 can be estimated without using a pressure sensor. Furthermore, there is no need to separately provide a reference gas and a gas cell for sealing the reference gas; the pressure inside the reaction vessel 2 can be estimated solely from the acquired spectral data. Moreover, since the pressure-dependent absorbance can be corrected using the estimated pressure, gas concentrations under the same pressure conditions can be compared.

[0049] As described above, the gas measuring device 5 according to this embodiment includes: an absorbance measuring device 10, which irradiates detection light into the reaction vessel 2 where methane gas is generated, and measures the absorbance of the detection light after passing through the gas environment inside the reaction vessel 2; an absorbance data analysis unit 21, which performs spectral analysis on the absorbance data measured by the absorbance measuring device 10; a peak detection unit 22, which detects peak values ​​I1 and I2 at two points from the spectrum of absorbance analyzed by the absorbance data analysis unit 21; and a pressure calculation unit 23, which calculates the pressure inside the reaction vessel 2 based on the intensity ratio (I1 / I2) of the peak values ​​at the two points detected by the peak detection unit 22.

[0050] According to this structure, specific gases can be measured within the reaction vessel 2, where pressure changes, without the need for a pressure sensor. That is, since the pressure can be estimated from the peak value of absorbance, a pressure sensor is unnecessary. Furthermore, the pressure sensor associated with heat treatment, such as for sterilization within the reaction vessel 2, does not need to be removed. Additionally, gas sample extraction, such as that performed by gas chromatography, is unnecessary, thus preventing the introduction of impurities into the reaction vessel. Moreover, the concentration of specific gases can be accurately estimated within the reaction vessel, even under pressure changes.

[0051] Furthermore, the gas measurement method according to this embodiment includes: an absorbance measurement step, in which detection light is irradiated into the reaction container 2 where the gas is generated, and the absorbance of the detection light after passing through the gas environment inside the reaction container 2 is measured; an absorbance data analysis step, in which the absorbance data measured in the absorbance measurement step is subjected to spectral analysis; a peak detection step, in which the peak values ​​I1 and I2 at two points are detected from the spectrum of absorbance analyzed in the absorbance data analysis step; and a pressure calculation step, in which the pressure inside the reaction container 2 is calculated based on the intensity ratio (I1 / I2) of the peak values ​​at the two points detected in the peak detection step.

[0052] Based on this structure, it is also possible to measure specific gases within the reaction vessel 2 where the pressure changes, without the need for a pressure sensor.

[0053] The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. The various shapes and combinations of the structural components shown in the above embodiments are examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0054] For example, the analyte is not limited to methane gas. Similar to methane gas, hydrocarbons, nitrogen compounds, and sulfur compounds that exhibit near-infrared and infrared absorption can also be used as analytes. Furthermore, if the relationship between the peak intensity ratio (I1 / I2) and pressure, and the relationship between gas concentration and absorbance at various pressures are known, pressure correction can be performed without using a pressure sensor, and the concentration of the gas can be quantitatively evaluated. Therefore, the analyte is not limited to gases that exhibit near-infrared and infrared absorption.

[0055] Furthermore, the peak detection unit 22 is not limited to a structure that detects only two peak values. For example, the peak detection unit 22 may first detect three or more peak values, select the two best ones, and utilize their peak values. Moreover, the peak detection unit 22 may also use one or more missed peak values ​​to correct for pressure and gas concentration.

[0056] Furthermore, some or all of the above-described embodiments may be described as in the following appendix, but are not limited to the following.

[0057] (Appendix 1)

[0058] A gas measuring device, comprising: An absorbance measuring device irradiates a detection light into a reaction vessel that generates gas, and measures the absorbance of the detection light after it passes through the gas environment inside the reaction vessel. The absorbance data analysis unit performs spectral analysis on the absorbance data measured by the absorbance measuring device. A peak detection unit detects multiple peak values ​​from the spectrum of absorbance resolved by the absorbance data analysis unit; and The gas concentration output unit outputs the concentration of the gas in the reaction vessel based on the intensity ratio of the peak values ​​of two points among the plurality of peak values ​​detected by the peak detection unit.

[0059] Explanation of the label

[0060] 1…Methane generation device, 2…Reaction vessel, 3…Gas supply device, 3a…Valve, 4…Generated gas extraction device, 4a…Valve, 5…Gas measuring device, 6…Cultivation medium, 7…Gas-liquid interface, 8…Stirring mechanism, 10…Absorbance measuring device, 11…Information processing unit, 12…Concentration output unit, 20…Device control unit, 21…Absorbance data analysis unit, 22…Peak detection unit, 23…Pressure calculation unit, 24…Gas concentration calculation unit, 24a…Peak peak value standardization unit, 24b…Data comparison unit, CO2…Carbon dioxide, H2…Hydrogen, I1…Peak peak value, I2…Peak peak value, I3…Peak peak value

Claims

1. A gas measuring device, comprising: An absorbance measuring device irradiates a detection light into a reaction vessel that generates gas, and measures the absorbance of the detection light after it passes through the gas environment inside the reaction vessel. The absorbance data analysis unit performs spectral analysis on the absorbance data measured by the absorbance measuring device. The peak detection unit detects multiple peak values ​​from the spectrum of absorbance resolved by the absorbance data analysis unit. as well as The pressure calculation unit calculates the pressure inside the reaction vessel based on the intensity ratio of the peak values ​​of two points among the plurality of peak values ​​detected by the peak detection unit.

2. The gas measuring device according to claim 1, wherein, It has a gas concentration calculation unit that calculates the gas concentration based on the peak value of the absorbance at a specific wavelength resolved by the absorbance data analysis unit and the pressure inside the reaction vessel calculated by the pressure calculation unit.

3. The gas measuring device according to claim 2, wherein, It has a gas concentration output unit that outputs the concentration of the gas calculated by the gas concentration calculation unit.

4. The gas measuring device according to claim 2, wherein, The gas concentration calculation unit has a data comparison unit that compares the peak absorbance value and the gas concentration in a table that is pre-stored at a predetermined reference pressure with the peak absorbance value.

5. The gas measuring device according to claim 4, wherein, The gas concentration calculation unit includes a peak value standardization unit. This peak value standardization unit converts the peak value of the absorbance at a specific wavelength, as resolved by the absorbance data analysis unit, to the peak value under a specified reference pressure based on the pressure inside the reaction vessel calculated by the pressure calculation unit, and then standardizes it. The data comparison unit compares the pre-stored table data corresponding to the peak absorbance value and the gas concentration at the reference pressure with the standardized peak absorbance value.

6. The gas measuring apparatus according to any one of claims 1 to 5, wherein, The peak detection unit detects the peak values ​​of two adjacent points from the spectrum of absorbance resolved by the absorbance data analysis unit.

7. The gas measuring device according to claim 6, wherein, When the peak detection unit detects multiple groups of peak values ​​of two adjacent points within a specified wavelength range, it selects the group with the largest difference in peak values ​​between the two adjacent points.

8. A gas determination method, comprising: The absorbance measurement process involves irradiating a detection light into the reaction vessel where the generated gas is produced, and measuring the absorbance of the detection light after it passes through the gas environment inside the reaction vessel. The absorbance data analysis process involves performing spectral analysis on the absorbance data measured in the absorbance measurement process. The peak detection process involves detecting multiple peak values ​​from the spectrum of absorbance resolved in the absorbance data analysis process. as well as The pressure calculation step calculates the pressure inside the reaction vessel based on the intensity ratio of the peak values ​​of two points among the multiple peak values ​​detected in the peak detection step.

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