Flammable and explosive gas type identification and content analysis device

Abstract

The utility model discloses a flammable and explosive gas type identification and content analysis device, which relates to the technical field of optical sensors, not only receives Raman scattering light by combining a Raman spectrometer with a photomultiplier tube, but also solves the problem that in long-distance measurement, the content of the flammable and explosive gas can be accurately measured by designing a receiving unit. The problem that the measurement precision is not high due to the fact that a dispersion system is sensitive to vibration and the measured Raman spectrum is obviously deformed and the signal-to-noise ratio is low is solved, and type identification and content analysis of gas at a long distance can be achieved at the same time. The scheme comprises an excitation unit, a receiving unit and a processing unit, the excitation unit is aligned with the flammable and explosive gas; the receiving unit is connected with the processing unit and consists of a notch filter, a beam splitter, a band-pass filter, a photomultiplier and a Raman spectrometer; the processing unit is connected with the receiving unit and used for data processing. The device is used for gas type identification and content analysis.

Description

Technical Field

[0001] The utility model relates to the technical field of optical sensors, in particular to a device for identifying the types of inflammable and explosive gases and analyzing their contents. Background Art

[0002] In recent years, safety accidents caused by flammable and explosive gases have occurred frequently, causing economic losses to people and endangering their lives. Laser Raman spectroscopy is a non-destructive analysis method for analyzing the structure and composition of materials. It uses the principles of laser and spectroscopy to obtain relevant information by observing the scattering spectrum generated by the interaction between material molecules and laser.

[0003] For the detection of flammable and explosive gases, the gas must be measured remotely for the safety of the equipment operator. Laser Raman technology has the characteristics of no need for sample pretreatment, simultaneous detection of multiple components, and fast response, and is widely used in the field of remote detection of flammable and explosive gases.

[0004] In the existing technology, in the remote detection of flammable and explosive gases, Raman spectrometers are generally used to obtain the spectrum of scattered light signals to analyze the type and content of the gas. However, when the laser Raman gas telemetry system is used for long-distance measurement, the measured Raman spectrum is more likely to be significantly deformed, and the signal-to-noise ratio is low, which will affect the measurement accuracy because the dispersion system is sensitive to vibration. Utility Model Content

[0005] The utility model provides a device for identifying the type and analyzing the content of flammable and explosive gases. It not only receives Raman scattered light by combining a Raman spectrometer with a photomultiplier tube, but also designs a receiving unit, thereby solving the problem of low measurement accuracy caused by obvious deformation of the measured Raman spectrum and low signal-to-noise ratio due to the sensitivity of the dispersion system to vibration during long-distance measurement. The device can simultaneously realize the type identification and content analysis of gases at a relatively long distance.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a device for identifying the type and analyzing the content of flammable and explosive gases, comprising: an excitation unit, a receiving unit and a processing unit;

[0008] The excitation unit is aimed at the inflammable and explosive gas; the receiving unit is connected to the processing unit, and the receiving unit is composed of a notch filter, a beam splitter, a bandpass filter, a photomultiplier tube and a Raman spectrometer; the processing unit is connected to the receiving unit, and the processing unit is used for data processing.

[0009] Furthermore, the device for identifying the type and analyzing the content of flammable and explosive gases further includes: a collimation unit;

[0010] The collimation unit is located between the excitation unit and the inflammable and explosive gas.

[0011] Furthermore, the device for identifying the type and analyzing the content of flammable and explosive gases further includes: a telescope;

[0012] The telescope is located on the side of the receiving unit close to the flammable and explosive gas.

[0013] Furthermore, the device for identifying the type and analyzing the content of flammable and explosive gases further includes: an amplification unit;

[0014] The amplifying unit is connected to the receiving unit, and is located between the receiving unit and the processing unit.

[0015] Furthermore, the device for identifying the type and analyzing the content of flammable and explosive gases further includes: a signal acquisition unit;

[0016] The signal acquisition unit is connected to the amplification unit and the processing unit, and the signal acquisition unit is located between the amplification unit and the processing unit.

[0017] Furthermore, the flammable and explosive gas type identification and content analysis device, the Raman spectrometer comprises:

[0018] The Raman spectrometer consists of a slit, a first reflector, a second reflector, a blazed grating, a third reflector, a fourth reflector and an ICCD.

[0019] Furthermore, in the device for identifying the type and analyzing the content of flammable and explosive gases, the excitation unit comprises:

[0020] The excitation unit is a laser.

[0021] Furthermore, in the device for identifying the type and analyzing the content of flammable and explosive gases, the processing unit comprises:

[0022] The processing unit is a computer.

[0023] Furthermore, in the device for identifying and analyzing the type of flammable and explosive gas, the amplification unit comprises:

[0024] The amplification unit is an amplification circuit.

[0025] The utility model provides a device for identifying the type and analyzing the content of flammable and explosive gases, comprising: an excitation unit, a receiving unit and a processing unit; the excitation unit is aimed at the flammable and explosive gas; the receiving unit is connected to the processing unit, and the receiving unit is composed of a notch filter, a beam splitter, a bandpass filter, a photomultiplier tube and a Raman spectrometer; the processing unit is connected to the receiving unit, and the processing unit is used for data processing. Compared with the prior art, the utility model not only receives Raman scattered light by combining a Raman spectrometer with a photomultiplier tube, but also designs a receiving unit, thereby solving the problem of low measurement accuracy due to obvious deformation and low signal-to-noise ratio of the measured Raman spectrum during long-distance measurement due to the sensitivity of the dispersion system to vibration, and can simultaneously realize the type identification and content analysis of the gas at a relatively long distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments. The drawings are only used to illustrate the implementation methods and are not considered to be limitations of the present utility model.

[0027] Figure 1 This is a schematic diagram of the structure of a device for identifying and analyzing the types of flammable and explosive gases in an embodiment of the utility model;

[0028] Figure 2 This is a schematic diagram of the structure of a receiving unit in an embodiment of the utility model;

[0029] Figure 3 This is a schematic diagram of another receiving unit structure in an embodiment of the utility model;

[0030] Figure 4 This is a schematic diagram of the structure of another device for identifying and analyzing the types of flammable and explosive gases in an embodiment of the utility model.

[0031] In the figure, 1. excitation unit, 2. receiving unit, 21. notch filter, 22. beam splitter, 23. bandpass filter, 24. photomultiplier tube, 25. Raman spectrometer, 251. slit, 252. first reflector, 253. second reflector, 254. blazed grating, 255. third reflector, 256. fourth reflector, 257. ICCD, 3. processing unit, 4. collimation unit, 5. telescope, 6. amplification unit, 7. signal acquisition unit. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the field of the present invention; the terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings, and are intended to cover non-exclusive inclusions.

[0034] In the description of the embodiments of the present utility model, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present utility model, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0035] In the description of the embodiments of the present utility model, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] In the description of the embodiments of the present invention, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0037] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0038] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to the specific circumstances.

[0039] The utility model provides a device for identifying the type and analyzing the content of flammable and explosive gases. Figure 1 As shown, it includes: an excitation unit 1, a receiving unit 2 and a processing unit 3;

[0040] The excitation unit 1 is aimed at the inflammable and explosive gas; the receiving unit 2 is connected to the processing unit 3, and the receiving unit 2 is composed of a notch filter 21, a beam splitter 22, a bandpass filter 23, a photomultiplier tube 24 and a Raman spectrometer 25; the processing unit 3 is connected to the receiving unit 2, and the processing unit 3 is used for data processing.

[0041] Among them, the excitation unit 1 is a laser, which is used to excite flammable and explosive gases to excite Raman scattered light. Raman scattered light refers to an inelastic scattering phenomenon that occurs when light waves pass through matter. This scattering is caused by the interaction between photons and the vibration or rotation energy levels of molecules or crystal lattices. In this process, the energy of the scattered photons changes, which causes the frequency of the scattered light to be different from the frequency of the incident light. This frequency change is called Raman shift, which is an important source of information for analyzing the structure and properties of substances. Raman scattering spectroscopy is a powerful analytical tool widely used in chemistry, physics, biology, and materials science. By measuring Raman scattering spectra, scientists can obtain important information about molecular structure, chemical composition, intermolecular interactions, and physical properties of substances.

[0042] like Figure 2 As shown, the receiving unit 2 is composed of a notch filter 21 , a beam splitter 22 , a bandpass filter 23 , a photomultiplier tube 24 and a Raman spectrometer 25 .

[0043] Notch filter21: An optical filter that is designed to block (i.e., "notch") one or more specific wavelengths of light while allowing other wavelengths of light to pass through.

[0044] Beam splitter 22: is an optical device used to split an incident light beam into two or more light beams in different directions.

[0045] Bandpass filter 23: is an optical filter that allows only light of a specific wavelength range to pass through while blocking light of other wavelengths.

[0046] Photomultiplier tube 24: is a highly sensitive photodetector used to detect extremely low intensity light signals. Photomultiplier tubes work by converting incident photons into electrons and amplifying these electronic signals.

[0047] Raman spectrometer 25: is an instrument specially designed to measure Raman scattering spectra. Raman spectroscopy is an analytical technique based on the principle of light scattering, which can provide detailed information about the molecular structure and chemical composition of substances.

[0048] Further, such as Figure 3 As shown, the Raman spectrometer 25 is composed of a slit 251 , a first reflector 252 , a second reflector 253 , a blazed grating 254 , a third reflector 255 , a fourth reflector 256 and an ICCD 257 .

[0049] Slit 251: An optical element used to limit the width of a beam of light or to define its geometry. In experimental optics and spectroscopy, slits are often used to produce narrow, uniform beams of light, and are key components in spectrometers, spectrometers, and other optical devices.

[0050] The first reflector 252 , the second reflector 253 , the third reflector 255 , and the fourth reflector 256 : a reflector is an optical element mainly used to reflect light.

[0051] Blazed Grating 254: is a high-resolution diffraction grating used in spectroscopy.

[0052] ICCD257: Integrated Circuit Card Device, mainly used to describe devices and technologies related to smart cards or chip cards (such as SIM cards, bank cards, ID cards, etc.). These cards have one or more integrated circuits embedded in them to store and process data, usually for identity authentication, data storage, and application processing.

[0053] The processing unit 3 is a computer for processing data.

[0054] like Figure 4 As shown, preferably, the device for identifying and analyzing the type of flammable and explosive gas further includes: a collimation unit 4;

[0055] The collimating unit 4 is located between the exciting unit 1 and the inflammable and explosive gas.

[0056] The collimating unit 4 is used to focus the light source and collimate the light beam.

[0057] Preferably, the device for identifying the type and analyzing the content of flammable and explosive gases further comprises: a telescope 5;

[0058] The telescope 5 is located on the side of the receiving unit 2 close to the flammable and explosive gas.

[0059] The telescope 5 is used to collect inflammable and explosive gases.

[0060] Preferably, the device for identifying the type and analyzing the content of flammable and explosive gases further comprises: an amplification unit 6;

[0061] The amplifying unit 6 is connected to the receiving unit 2 , and is located between the receiving unit 2 and the processing unit 3 .

[0062] The amplifying unit 6 is an amplifying circuit for amplifying the received signal.

[0063] Preferably, the device for identifying the type and analyzing the content of flammable and explosive gases further comprises: a signal acquisition unit 7;

[0064] The signal acquisition unit 7 is connected to the amplification unit 6 and the processing unit 3 , and the signal acquisition unit 7 is located between the amplification unit 6 and the processing unit 3 .

[0065] The signal acquisition unit 7 is used to acquire the signal amplified by the amplification unit.

[0066] The working principle of the utility model is as follows: the excitation unit 1 excites the Raman scattered light of the inflammable and explosive gas, and the Raman scattered light enters the receiving unit 2 after being collected by the telescope 5. First, the Raman scattered light passes through the notch filter 21 corresponding to the incident wavelength of the excitation unit 1 to filter out the Rayleigh scattered light with a smaller frequency shift. After filtering, the Raman scattered light enters the beam splitter 22, and the beam splitter 22 separates the Raman scattered light into two beams with an intensity transmission ratio of 70:30. 70% of the Raman scattered light beam enters the Raman spectrometer 25. In the Raman spectrometer 25, after being reflected by the first reflector 252 and the second reflector 253, it is irradiated to the blazed grating 254, and the blazed grating 254 expands the scattered light of different wavelengths. The expanded light beam passes through the third reflector 255 and the fourth reflector 256 and is focused on the ICCD 257. The ICCD 257 transmits the spectrum data to the processing unit 3, and the data processing of the processing unit 3 completes the identification of the type of inflammable and explosive gas. Another 30% of the Raman scattered light beam is reflected by the beam splitter 22, and after passing through the bandpass filter 23, is received by the photomultiplier tube 24, and the Raman scattered light signal is converted into a voltage signal, amplified by the amplifier unit 6, and transmitted to the processing unit 3 through the signal acquisition unit 7. After data processing by the processing unit 3, the analysis of the flammable and explosive gas content is completed.

[0067] The utility model provides a device for identifying the type and analyzing the content of flammable and explosive gases, comprising: an excitation unit, a receiving unit and a processing unit; the excitation unit is aimed at the flammable and explosive gas; the receiving unit is connected to the processing unit, and the receiving unit is composed of a notch filter, a beam splitter, a bandpass filter, a photomultiplier tube and a Raman spectrometer; the processing unit is connected to the receiving unit, and the processing unit is used for data processing. Compared with the prior art, the utility model not only receives Raman scattered light by combining a Raman spectrometer with a photomultiplier tube, but also designs a receiving unit, thereby solving the problem of low measurement accuracy due to obvious deformation and low signal-to-noise ratio of the measured Raman spectrum during long-distance measurement due to the sensitivity of the dispersion system to vibration, and can simultaneously realize the type identification and content analysis of the gas at a relatively long distance.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, not to limit it; although the utility model has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and description of the utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A device for identifying and analyzing the types of flammable and explosive gases, characterized in that: include: An excitation unit (1), a receiving unit (2) and a processing unit (3); The excitation unit (1) is aimed at the flammable and explosive gas; the receiving unit (2) is connected to the processing unit (3), the receiving unit (2) is composed of a notch filter (21), a beam splitter (22), a bandpass filter (23), a photomultiplier tube (24) and a Raman spectrometer (25); the processing unit (3) is connected to the receiving unit (2), and the processing unit (3) is used for data processing.

2. The device for identifying and analyzing the type of flammable and explosive gas according to claim 1, characterized in that: Also includes: collimation unit (4); The collimation unit (4) is located between the excitation unit (1) and the flammable and explosive gas.

3. The device for identifying and analyzing the type of flammable and explosive gas according to claim 1 or 2, characterized in that: Also includes: Telescope (5); The telescope (5) is located on a side of the receiving unit (2) close to the flammable and explosive gas.

4. The device for identifying and analyzing the type of flammable and explosive gas according to claim 1, characterized in that: Also includes: Amplification unit (6); The amplifying unit (6) is connected to the receiving unit (2), and the amplifying unit (6) is located between the receiving unit (2) and the processing unit (3).

5. The device for identifying and analyzing the type of flammable and explosive gas according to claim 4, characterized in that: It also includes: a signal acquisition unit (7); The signal acquisition unit (7) is connected to the amplification unit (6) and the processing unit (3); the signal acquisition unit (7) is located between the amplification unit (6) and the processing unit (3).

6. The device for identifying and analyzing the type of flammable and explosive gas according to claim 1, characterized in that: The Raman spectrometer (25) comprises: The Raman spectrometer (25) is composed of a slit (251), a first reflector (252), a second reflector (253), a blazed grating (254), a third reflector (255), a fourth reflector (256), and an ICCD (257).

7. The device for identifying and analyzing the type of flammable and explosive gas according to claim 1, characterized in that: The excitation unit (1) comprises: The excitation unit (1) is a laser.

8. The device for identifying and analyzing the type of flammable and explosive gas according to claim 1, characterized in that: The processing unit (3) comprises: The processing unit (3) is a computer.

9. The device for identifying and analyzing the type of flammable and explosive gas according to claim 4, characterized in that: The amplification unit (6) comprises: The amplifying unit (6) is an amplifying circuit.

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