Spectroscopic stable isotope measuring device

Abstract

The invention discloses a stable isotope measuring device adopting a spectrometry method, and is applied to the technical field of isotope measurement. Comprising an air inlet processing module, a data measuring module and a data processing module, gas enters from the gas inlet processing module and then is introduced into the data measurement module to collect data, the data is sent to the data processing module to be analyzed, the data measurement module is adjusted, and a stable isotope measurement result of the gas is obtained after measurement is finished. Compared with a mass spectrometer, the measuring device has the advantages that the volume is smaller, no complicated operation procedure is needed, the cavity ring-down detection technology is adopted, and detection is performed by measuring the ring-down time, so that the influence of factors such as light source fluctuation and light intensity attenuation is small; on the basis, the to-be-measured gas is treated, so that interference of impurities in the gas on a measurement result is avoided, the accuracy of the measurement result is improved, and long-term stable measurement of the isotope can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of isotope measurement, and more particularly to a stable isotope measurement device using a spectroscopy method. Background Art

[0002] Isotopes refer to different atoms of the same element with the same number of protons but different numbers of neutrons. They are called isotopes and stable isotopes. Isotopes can be divided into radioactive isotopes and stable isotopes. Among them, stable isotopes have the characteristics of high stability and no decay. By measuring the stable isotopes in the sample, we can understand the climate and environment. Stable isotopes such as carbon (C), hydrogen (H), and oxygen (O) are used to estimate environmental parameters. The measurement of stable isotopes is of great significance for the study of atmospheric environment and ecological science. Most of the existing stable isotope measurements use mass spectrometry and spectroscopy. Among them, the mass spectrometer is large in size, the operating procedure is complicated, and it requires real-time operation by professionals. Although the spectroscopy avoids the above defects, the spectroscopy requires the gas to be measured to be input into the optical ring-down cavity for measurement, and the impurities present in the gas will affect the measurement accuracy of the spectroscopy. Therefore, how to provide a spectroscopy stable isotope measurement device is a problem that technicians in this field need to solve urgently. Summary of the invention

[0003] In view of this, the present invention provides a spectral stable isotope measurement device, which realizes automatic gas entry and impurity filtering through an intake processing module, and realizes stable isotope measurement through a data measurement module and a data processing module, thereby improving measurement accuracy.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A stable isotope measurement device using a spectroscopy method comprises an air intake processing module, a data measurement module and a data processing module; after the gas enters the air intake processing module, it is passed into the data measurement module to collect data, the data is sent to the data processing module for analysis, the data measurement module is adjusted, and after the measurement is completed, the stable isotope measurement result of the gas is obtained; the air intake processing module comprises a first coarse filter, a first air intake pump, a first solenoid valve and a fine filter connected in sequence, the fine filter is also connected to a first interface of a first multi-way valve, the second interface of the first multi-way valve is connected to a gas separation device, and the third interface of the first multi-way valve is also connected to The first interface of the second multi-way valve is connected, the second interface of the second multi-way valve is connected to the data measurement module, and the third interface of the second multi-way valve is connected to the gas separation device. The gas passes through the first coarse filter, the first air intake pump, the first solenoid valve and the fine filter in sequence to filter out solid particles. If the gas is directly input into the data measurement module through the first multi-way valve and the second multi-way valve for measurement, the stable isotope measurement result of the mixed gas is obtained; if the gas is input into the data measurement module through the first multi-way valve, the gas separation device and the second multi-way valve for measurement, the stable isotope measurement result of the single gas is obtained.

[0006] Optionally, the air intake processing module also includes a second coarse filter, a third coarse filter, a second air intake pump, a third air intake pump, a second solenoid valve and a third solenoid valve, wherein the second coarse filter, the second air intake pump and the second solenoid valve are connected in sequence, the third coarse filter, the third air intake pump and the third solenoid valve are connected in sequence, and the second solenoid valve and the third solenoid valve are both connected to the fine filter; the first coarse filter, the second coarse filter and the third coarse filter are respectively connected to different gas input pipelines to be tested, and different gases to be tested are introduced by controlling the opening and closing of the first solenoid valve, the second solenoid valve and the third solenoid valve.

[0007] Optionally, a third multi-way valve is arranged between the third interface of the second multi-way valve and the gas separation device, and the first interface, the second interface and the third interface of the third multi-way valve are respectively connected to the third interface of the second multi-way valve, the gas separation device and the fourth air intake pump. After the gas measurement is completed, the fourth air intake pump draws in zero gas and enters the data measurement module through the third multi-way valve and the second multi-way valve in sequence.

[0008] Optionally, the data measurement module includes a laser, a wavelength monitor, an optical ring-down cavity, a focusing lens, and a photodetector connected in sequence; the laser, the wavelength monitor, and the photodetector are also connected to the data processing module; the data processing module controls the laser to emit laser, the wavelength monitor monitors the wavelength of the laser and sends it to the data processing module, the stable isotope measurement of the gas is performed in the optical ring-down cavity, the light transmitted from the optical outlet of the optical ring-down cavity is focused by the focusing lens and then detected by the photodetector, and the photodetector sends the detection result to the data processing module.

[0009] Optionally, the data measurement module also includes a temperature and pressure acquisition device and a temperature and pressure adjustment device. The temperature and pressure acquisition device collects temperature and pressure data in the optical ring-down cavity and sends them to the data processing module. The data processing module adjusts the temperature and pressure in the optical ring-down cavity through the temperature and pressure adjustment device.

[0010] Optionally, the data measurement module further includes a cavity adjustment device, which is connected to the data processing module, and the data processing module adjusts the length of the optical ring-down cavity through the cavity adjustment device.

[0011] Optionally, the data processing module includes a signal amplifier, an AD conversion circuit, a data processing unit and a laser control unit which are connected in sequence. The signal amplifier is also connected to the photodetector, and the laser control unit is also connected to the laser and the wavelength monitor.

[0012] It can be seen from the above technical solutions that, compared with the prior art, the present invention provides a spectroscopy stable isotope measurement device, which has the following beneficial effects: the present invention adopts spectroscopy for measurement. Compared with a mass spectrometer, the measurement device of the present invention is smaller in size and does not require complicated operating procedures. It adopts optical cavity ring-down detection technology and performs detection by measuring the ring-down time. Therefore, it is less affected by factors such as light source fluctuation and light intensity attenuation. On this basis, the present invention avoids the interference of impurities in the gas on the measurement result by processing the gas to be measured, improves the accuracy of the measurement result, and can achieve long-term stable measurement of isotopes; the present invention sets multiple gas inputs to be measured, and can measure multiple gases to be measured in turn, and the multiple gases to be measured will not interfere with each other; the present invention sets a gas separation device, which can measure the stable isotope of a single gas in a multi-component gas; the present invention can adapt to different gases by adjusting the temperature, pressure and ring-down cavity length in the optical ring-down cavity, thereby improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the stable isotope measuring device of the present invention;

[0015] Figure 2 It is a schematic diagram of an intake air processing module of the present invention;

[0016] Figure 3 is a schematic diagram of an intake air processing module in an embodiment of the present invention;

[0017] Figure 4 is a schematic diagram of another intake air processing module in an embodiment of the present invention;

[0018] Figure 5 It is a schematic diagram of a data measurement module of the present invention;

[0019] Figure 6 is a schematic diagram of a data measurement module in an embodiment of the present invention;

[0020] Figure 7 It is a schematic diagram of the data processing module of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The embodiment of the present invention discloses a spectral stable isotope measurement device, such as Figure 1 As shown, it includes an intake processing module, a data measurement module and a data processing module; after the gas enters the intake processing module, it passes into the data measurement module to collect data, and the data is sent to the data processing module for analysis, and the data measurement module is adjusted. After the measurement is completed, the stable isotope measurement result of the gas is obtained; as shown Figure 2 As shown, the air intake processing module includes a first coarse filter, a first air intake pump, a first solenoid valve and a fine filter which are connected in sequence, the fine filter is also connected to the first interface of the first multi-way valve, the second interface of the first multi-way valve is connected to the gas separation device, the third interface of the first multi-way valve is also connected to the first interface of the second multi-way valve, the second interface of the second multi-way valve is connected to the data measurement module, and the third interface of the second multi-way valve is connected to the gas separation device. The gas passes through the first coarse filter, the first air intake pump, the first solenoid valve and the fine filter in sequence to filter out solid particles. If the gas is directly input into the data measurement module through the first multi-way valve and the second multi-way valve for measurement, the stable isotope measurement result of the mixed gas is obtained; if the gas is input into the data measurement module through the first multi-way valve, the gas separation device and the second multi-way valve for measurement, the stable isotope measurement result of the single gas is obtained.

[0023] Furthermore, in an embodiment of the present invention, a desiccant is also provided in the first coarse filter, and the desiccant is used to remove moisture in the gas to be measured. The first coarse filter can filter out solid particles with a diameter of 2 microns, and the fine filter can filter out solid particles with a diameter of 1 micron. After filtering by the first coarse filter and the fine filter, the interference of solid particles in the gas to be measured is basically eliminated, thereby improving the measurement accuracy.

[0024] Furthermore, in an embodiment of the present invention, the gas separation device adopts a chromatographic column gas separation device. Through the gas separation device, the measuring device in this embodiment can directly measure the stable isotopes of the multi-component gas, and can also choose to measure a single gas in the multi-component gas, taking into account multiple measurement needs.

[0025] Further, such as Figure 3 As shown, the air intake processing module also includes a second coarse filter, a third coarse filter, a second air intake pump, a third air intake pump, a second solenoid valve and a third solenoid valve, wherein the second coarse filter, the second air intake pump and the second solenoid valve are connected in sequence, the third coarse filter, the third air intake pump and the third solenoid valve are connected in sequence, and the second solenoid valve and the third solenoid valve are both connected to the fine filter; the first coarse filter, the second coarse filter and the third coarse filter are respectively connected to different gas input pipelines to be tested, and different gases to be tested are introduced by controlling the opening and closing of the first solenoid valve, the second solenoid valve and the third solenoid valve.

[0026] The first coarse filter, the second coarse filter, and the third coarse filter correspond to three air inlets respectively, and can be connected to different gases to be tested respectively, so that different gases to be tested can be measured in sequence. The gas to be tested can be a multi-component gas or a single gas. After passing through the fine filter, the multi-component gas can also be separated by a gas separation device or directly measured.

[0027] Further, such as Figure 4 As shown, a third multi-way valve is arranged between the third interface of the second multi-way valve and the gas separation device, and the first interface, the second interface and the third interface of the third multi-way valve are respectively connected to the third interface of the second multi-way valve, the gas separation device and the fourth air intake pump. After the gas measurement is completed, the fourth air intake pump draws in zero gas through the third multi-way valve and the second multi-way valve in sequence into the data measurement module.

[0028] Further, such as Figure 5 As shown, the data measurement module includes a laser, a wavelength monitor, an optical ring-down cavity, a focusing lens, and a photodetector which are connected in sequence. The laser, the wavelength monitor, and the photodetector are also connected to the data processing module; the data processing module controls the laser to emit laser light, the wavelength monitor monitors the wavelength of the laser and sends it to the data processing module, the stable isotope of the gas is measured in the optical ring-down cavity, the light transmitted from the optical outlet of the optical ring-down cavity is focused by the focusing lens and then detected by the photodetector, and the photodetector sends the detection result to the data processing module.

[0029] Further, such as Figure 6As shown, the data measurement module also includes a temperature and pressure acquisition device and a temperature and pressure adjustment device. The temperature and pressure acquisition device collects temperature and pressure data in the optical ring-down cavity and sends them to the data processing module. The data processing module adjusts the temperature and pressure in the optical ring-down cavity through the temperature and pressure adjustment device.

[0030] Furthermore, the data measurement module also includes a cavity adjustment device, which is connected to the data processing module. The data processing module adjusts the length of the optical ring-down cavity through the cavity adjustment device.

[0031] Further, such as Figure 7 As shown, the data processing module includes a signal amplifier, an AD conversion circuit, a data processing unit and a laser control unit which are connected in sequence. The signal amplifier is also connected to a photodetector, and the laser control unit is also connected to a laser and a wavelength monitor.

[0032] Furthermore, in an embodiment of the present invention, the laser generated by the laser passes through an optical ring-down cavity filled with the gas to be measured, and the data processing unit calculates the isotope abundance to complete the measurement. During the measurement process, the data processing unit can control the wavelength of the laser, the temperature, pressure and length in the optical ring-down cavity.

[0033] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0034] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spectroscopy stable isotope measurement device, characterized in that: The invention comprises an air intake processing module, a data measurement module and a data processing module; after the gas enters the air intake processing module, it is passed into the data measurement module to collect data, the data is sent to the data processing module for analysis, the data measurement module is adjusted, and the stable isotope measurement result of the gas is obtained after the measurement is completed; the air intake processing module comprises a first coarse filter, a first air intake pump, a first solenoid valve and a fine filter connected in sequence, the fine filter is also connected to the first interface of the first multi-way valve, the second interface of the first multi-way valve is connected to the gas separation device, the third interface of the first multi-way valve is also connected to the first interface of the second multi-way valve, the second interface of the second multi-way valve is connected to the data measurement module, and the third interface of the second multi-way valve is connected to the gas separation device. After the gas passes through the first coarse filter, the first air intake pump, the first solenoid valve and the fine filter in sequence, solid particles are filtered out. If the gas is directly input into the data measurement module through the first multi-way valve and the second multi-way valve for measurement, the stable isotope measurement result of the mixed gas is obtained; if the gas is input into the data measurement module through the first multi-way valve, the gas separation device and the second multi-way valve for measurement, the stable isotope measurement result of the single gas is obtained.

2. The spectral stable isotope measurement device according to claim 1, characterized in that: The air intake processing module also includes a second coarse filter, a third coarse filter, a second air intake pump, a third air intake pump, a second solenoid valve and a third solenoid valve, wherein the second coarse filter, the second air intake pump and the second solenoid valve are connected in sequence, the third coarse filter, the third air intake pump and the third solenoid valve are connected in sequence, and the second solenoid valve and the third solenoid valve are both connected to the fine filter; the first coarse filter, the second coarse filter and the third coarse filter are respectively connected to different gas input pipelines to be tested, and different gases to be tested are introduced by controlling the opening and closing of the first solenoid valve, the second solenoid valve and the third solenoid valve.

3. The spectral stable isotope measurement device according to claim 1, characterized in that: A third multi-way valve is arranged between the third interface of the second multi-way valve and the gas separation device. The first interface, the second interface and the third interface of the third multi-way valve are respectively connected to the third interface of the second multi-way valve, the gas separation device and the fourth air intake pump. After the gas measurement is completed, the fourth air intake pump draws in zero gas and enters the data measurement module through the third multi-way valve and the second multi-way valve in sequence.

4. The spectral stable isotope measurement device according to claim 1, characterized in that: The data measurement module includes a laser, a wavelength monitor, an optical ring-down cavity, a focusing lens, and a photoelectric detector which are connected in sequence. The laser, the wavelength monitor, and the photoelectric detector are also connected to the data processing module; the data processing module controls the laser to emit laser light, the wavelength monitor monitors the wavelength of the laser and sends it to the data processing module, the stable isotope of the gas is measured in the optical ring-down cavity, the light transmitted from the optical outlet of the optical ring-down cavity is focused by the focusing lens and then detected by the photoelectric detector, and the photoelectric detector sends the detection result to the data processing module.

5. The spectral stable isotope measurement device according to claim 4, characterized in that: The data measurement module also includes a temperature and pressure acquisition device and a temperature and pressure adjustment device. The temperature and pressure acquisition device collects temperature and pressure data in the optical ring-down cavity and sends them to the data processing module. The data processing module adjusts the temperature and pressure in the optical ring-down cavity through the temperature and pressure adjustment device.

6. The spectral stable isotope measurement device according to claim 4, characterized in that: The data measurement module also includes a cavity adjustment device, which is connected to the data processing module. The data processing module adjusts the length of the optical ring-down cavity through the cavity adjustment device.

7. The spectral stable isotope measurement device according to claim 4, characterized in that: The data processing module includes a signal amplifier, an AD conversion circuit, a data processing unit and a laser control unit which are connected in sequence. The signal amplifier is also connected to a photoelectric detector, and the laser control unit is also connected to a laser and a wavelength monitor.

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