High-temperature-resistant Raman probe

Abstract

The high-temperature-resistant Raman probe comprises a shell, an optical assembly, an air chamber and a heat insulation pipe, the optical assembly comprises a signal transmitter, a signal receiver and a diaphragm, and the signal transmitter and the signal receiver are arranged in the shell; the gas chamber is arranged on one side of the shell and is provided with a cavity for introducing gas to be detected, and the cavity extends in the first direction; the heat insulation pipe is detachably installed between the shell and the air chamber, one end of the heat insulation pipe is fixed to the air chamber, right faces the window piece and is made of reinforced composite materials, and the window piece is detachably arranged at the end, close to the heat insulation pipe, of the cavity or the end, close to the cavity, of the heat insulation pipe. In this way, when high-temperature gas is detected, heat insulation is achieved through the heat insulation pipe, and the optical element is prevented from being heated and damaged; meanwhile, the heat insulation pipe and the air chamber can be quickly disassembled, pollutants attached to the surface of the window piece are wiped, the detection accuracy is guaranteed, and the heat insulation pipe is convenient to replace when damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of gas monitoring, in particular to a high-temperature resistant Raman probe. Background Art

[0002] Laser Raman spectroscopy technology has shown significant advantages in the field of gas detection, especially in the simultaneous detection and analysis of multi-component gases. This technology uses the Raman scattering characteristics of gas molecules, excites gas molecules through high-power lasers, collects and analyzes scattering spectra, and achieves qualitative and quantitative analysis of gas components. The development of this technology provides a high-precision and high-sensitivity gas analysis method for industrial process control and environmental monitoring.

[0003] As market demand continues to increase, the use of in-situ Raman probes for monitoring gas concentration continues to expand. They are no longer limited to environments with normal temperature and pressure, but are frequently used in industrial sites with harsh environments, such as the Raman detection devices provided by patent documents CN216082493U and CN220367217U. However, if the gas being measured is a high-temperature (>100°C) gas, the overall temperature of the Raman probe will be too high, and the refractive index of the air inside the probe will change, affecting the optical properties of the signal receiver and components, causing the Raman signal to decrease. In addition, a small amount of pollutants (such as tar, etc.) will accumulate and adhere to the surface of the lens in the gas chamber, and damage the lens after being burned by the laser, causing the Raman signal to decrease, thereby causing large errors in gas concentration monitoring. Utility Model Content

[0004] The main purpose of the utility model is to provide a high temperature resistant Raman probe suitable for high-precision detection of high temperature gas.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes a high temperature resistant Raman probe, comprising:

[0006] case;

[0007] An optical component, comprising a signal transmitter, a signal receiver and a window sheet, wherein the signal transmitter and the signal receiver are arranged in the housing;

[0008] an air chamber, disposed on one side of the housing, having a cavity for introducing the gas to be detected, wherein the cavity extends along a first direction; and

[0009] The insulation tube is detachably installed between the shell and the air chamber, and one end of which is fixed on the air chamber and facing the window piece, and is made of reinforced composite material. The window piece is detachably arranged at one end of the cavity close to the insulation tube or one end of the insulation tube close to the cavity.

[0010] Optionally, one end of the air chamber connected to the insulation tube or one end of the insulation tube connected to the air chamber is detachably mounted with a mounting seat, and the window piece is fixedly mounted on the mounting seat.

[0011] Optionally, a groove is concavely provided in one end of the air chamber connected to the heat-insulating tube, or a groove is concavely provided in one end of the heat-insulating tube connected to the air chamber;

[0012] The mounting seat is arranged in the groove and fixedly connected to the bottom wall of the groove.

[0013] Optionally, a first outer flange is provided at one end of the air chamber close to the insulation tube, and a second outer flange is provided at one end of the insulation tube close to the air chamber, and the first outer flange and the second outer flange are fixedly connected by screws.

[0014] Optionally, an opening is provided on the side wall of the thermal insulation tube, and the opening is sealed by a sealing member.

[0015] Optionally, a heat sink is provided between the thermal insulation tube and the shell.

[0016] Optionally, the optical assembly further comprises a focusing lens;

[0017] A connecting pipe is provided between the heat insulation pipe and the shell, the heat sink is provided on the outer periphery of the connecting pipe, and the focusing lens is provided at one end of the connecting pipe connected to the shell.

[0018] Optionally, at least a first jackscrew group and a second jackscrew group are inserted into a portion of the connecting tube corresponding to the focusing lens, and the first jackscrew group and the second jackscrew group respectively include two jackscrews;

[0019] The two top screws of the first top screw group are symmetrically arranged in the second direction and can move relative to the connecting tube along the second direction, so that the focusing lens can move relative to the connecting tube along the second direction and be fixed by the two top screws of the first top screw group when the focusing lens moves to the first preset position;

[0020] The two top screws of the second top screw group are symmetrically arranged in the third direction and can move relative to the connecting tube along the third direction, so that the focusing lens can move relative to the connecting tube along the third direction and be fixed by the two top screws of the second top screw group when the focusing lens moves to the second preset position;

[0021] The second direction, the third direction and the first direction are perpendicular to each other in a horizontal plane.

[0022] Optionally, the focusing lens is a double-cemented focusing lens.

[0023] Optionally, the connecting pipe is made of a low thermal expansion alloy material;

[0024] The air chamber is made of aluminum alloy material;

[0025] The window piece is made of sapphire material.

[0026] Optionally, the heat sink is a multi-plate heat sink.

[0027] Optionally, a matte piece is detachably mounted on one end of the cavity away from the insulation tube.

[0028] Optionally, the matte piece is arranged in a cone shape, and is gradually tapered in a direction toward the thermal insulation tube.

[0029] Optionally, the optical assembly further comprises a beam splitter and a focusing lens, and the focusing lens is arranged at one end of the heat insulation tube close to the shell;

[0030] The housing comprises:

[0031] A reflective cavity, connected to the heat-insulating tube, in which the beam splitter is arranged;

[0032] an incident channel, which is arranged at one side of the reflective cavity in the second direction and in which the signal transmitter is arranged; and

[0033] An exit channel, which is arranged at one end of the reflection cavity away from the heat insulation tube, and in which the signal receiver is arranged;

[0034] The first direction and the second direction are arranged perpendicular to each other in a plane.

[0035] In the technical solution of the utility model, the heat-insulating tube is arranged between the shell and the air chamber. In this way, when the gas to be measured in the cavity is a high-temperature gas for heat conduction, the heat conduction is reduced and the shell is prevented from being deformed by the heat-insulating effect of the heat-insulating tube made of reinforced composite materials, thereby avoiding the optical elements in the shell from being damaged by heat and affecting the detection accuracy, thereby ensuring that the high-temperature resistant Raman probe can detect the high-temperature gas with high precision; in addition, the heat-insulating tube is detachably installed between the shell and the air chamber, and the window piece is detachably arranged at one end of the cavity close to the heat-insulating tube or one end of the heat-insulating tube close to the cavity. In this way, when contaminants are attached to the surface of the window piece, the heat-insulating tube, the air chamber and the window piece can be conveniently and quickly disassembled, and the contaminants on the window piece can be wiped to avoid damage to the window piece, thereby ensuring the detection accuracy of the high-temperature resistant Raman probe; at the same time, after the heat-insulating tube is disassembled, the specific situation of the heat-insulating tube can be detected, and it is convenient to replace the heat-insulating tube when it is damaged (such as cracks, etc.). BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the utility model 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 some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0037] Figure 1 A schematic structural diagram of an embodiment of a high temperature resistant Raman probe provided by the utility model;

[0038] Figure 2 for Figure 1 Cross-sectional view of the medium-temperature resistant Raman probe along AA;

[0039] Figure 3 A schematic structural diagram of an embodiment of a high temperature resistant Raman probe provided by the utility model;

[0040] Figure 4 for Figure 3 Cross-sectional view of the medium-temperature Raman probe along AA.

[0041] Description of Figure Numbers:

[0042] 100. High temperature resistant Raman probe;

[0043] 1. Shell, 11. Reflection cavity, 12. Incident channel; 13. Exit channel;

[0044] 2. Connecting pipe;

[0045] 3. Optical components, 31. Signal transmitter, 32. Spectroscope, 33. Signal receiver, 34. Focusing lens, 35. Window;

[0046] 4. air chamber, 41. cavity;

[0047] 5. Insulation pipe;

[0048] 6. Heat dissipation components;

[0049] 7. Mounting seat;

[0050] 8. Matte parts.

[0051] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] 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 of 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.

[0053] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0054] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0055] With the continuous improvement of market demand, the application field of in-situ Raman probes for monitoring gas concentration is constantly expanding. It is no longer limited to the environment of normal temperature and pressure, and is frequently used in industrial sites with relatively harsh environments, such as the Raman detection devices provided by patent documents CN216082493U and CN220367217U. However, if the gas to be measured is a high-temperature (>100°C) gas, the overall temperature of the Raman probe will be too high, and the refractive index of the air inside the probe will change, affecting the optical properties of the signal receiver and components, causing the Raman signal to decrease. In addition, a small amount of pollutants (such as tar, etc.) will accumulate and adhere to the surface of the lens in the gas chamber, and after being burned by the laser, the lens will be damaged, causing the Raman signal to fluctuate, thereby causing large errors in gas concentration monitoring.

[0056] In view of this, the utility model provides a high temperature resistant Raman probe 100. Figures 1 to 4 This is an embodiment of a high temperature resistant Raman probe 100 provided by the utility model.

[0057] See also Figures 1 to 4The high temperature resistant Raman probe 100 includes a shell 1, an optical component 3, an air chamber 4 and an insulation tube 5; the optical component 3 includes a signal transmitter 31, a signal receiver 33 and a window piece 35, and the signal transmitter 31 and the signal receiver 33 are arranged on the shell 1; the air chamber 4 is arranged on one side of the shell 1, and has a cavity 41 for passing the gas to be detected, and the cavity 41 extends along a first direction; the insulation tube 5 is detachably installed between the shell 1 and the air chamber 4, and one end of the insulation tube 5 is fixed on the air chamber 4 and faces the window piece 35, and is made of reinforced composite material, and the window piece 35 is detachably arranged at one end of the cavity 41 close to the insulation tube 5 or one end of the insulation tube 5 close to the cavity 41.

[0058] In the technical solution of the utility model, the heat-insulating tube 5 is arranged between the shell 1 and the air chamber 4. In this way, when the gas to be measured in the cavity is a high-temperature gas for heat conduction, the heat insulation effect of the heat-insulating tube 5 made of reinforced composite materials is used to reduce heat conduction and avoid deformation of the shell 1, thereby avoiding heat damage to the optical elements in the shell 1 and affecting the detection accuracy, thereby ensuring that the high-temperature resistant Raman probe 100 can detect high-temperature gas with high precision; in addition, the heat-insulating tube 5 can be detachably installed between the shell 1 and the air chamber 4, and the window sheet 35 can be detachably installed between the shell 1 and the air chamber 4. The disassembly device is arranged at one end of the cavity 41 close to the insulation tube 5 or one end of the insulation tube 5 close to the cavity 41. In this way, when contaminants adhere to the surface of the window piece 35, the insulation tube 5, the air chamber 4 and the window piece 35 can be easily and quickly disassembled, and the contaminants on the window piece 35 can be wiped to avoid damage to the window piece 35, thereby ensuring the detection accuracy of the high-temperature resistant Raman probe 100; at the same time, after disassembling the insulation tube 5, the specific situation of the insulation tube 5 can be detected, and when the insulation tube 5 is damaged (such as cracks, etc.), it is convenient to replace it.

[0059] It should be noted that, in the present invention, the signal transmitter 31 is used to emit laser, and the light beam first passes through the thermal insulation tube 5 and the window piece 35 and is emitted into the cavity 41. Part of the light beam collides with the gas to be measured that passes into the cavity 41 to generate Raman scattered light. The Raman scattered light is emitted through the window piece 35 and the thermal insulation tube 5 and enters the signal receiver 33.

[0060] It should also be noted that, in an embodiment of the present invention, the signal transmitter 31 is a laser, and the signal receiver 33 is an optical fiber.

[0061] It should also be noted that the air chamber 4 is provided with an air inlet and an air outlet connected to the cavity, the air inlet is inserted with an air inlet pipe to allow the gas to be tested to enter the cavity, and the air outlet is inserted with an air outlet pipe to discharge the gas to be tested out of the cavity.

[0062] Furthermore, a heat sink 6 is provided between the heat insulating tube 5 and the housing 1. Thus, most of the heat conducted to the housing 1 is first isolated by the heat insulating tube 5, and the remaining small part of the heat is quickly dissipated by the heat sink 6, thereby further reducing the heat exposure of the optical elements in the housing 1, thereby ensuring the detection accuracy.

[0063] For further information, see Figures 1 to 4 In one embodiment of the utility model, the optical assembly 3 further includes a focusing lens 34; a connecting tube 2 is provided between the heat-insulating tube 5 and the housing 1, the heat sink 6 is provided on the outer periphery of the connecting tube 2, and the focusing lens 34 is provided at one end of the connecting tube 2 connected to the housing 1. In this way, the heat-insulating effect of the heat-insulating tube 5 and the heat-dissipating effect of the heat sink 6 can prevent the connecting tube 2 from being deformed due to excessive heat, thereby preventing the focusing lens 34 in the connecting tube 2 from being displaced and causing the optical path to deviate, thereby affecting the detection accuracy.

[0064] It should be noted that the laser emitted by the signal transmitter 31 is first focused by the focusing lens 34 and then passes through the connecting tube 2 and the insulation tube 5 in sequence, and then enters the cavity 41 through the window piece 35. The light beam at the focal position collides with the gas to be measured that passes into the cavity to generate Raman scattered light. The Raman scattered light is collimated by the focusing lens 34 into parallel light and emitted to the signal receiving part.

[0065] Further, in an embodiment of the utility model, at least a first top screw group and a second top screw group are inserted into the portion of the connecting tube 2 corresponding to the focusing lens 34, and the first top screw group and the second top screw group respectively include two top screws; the two top screws of the first top screw group are symmetrically arranged in the second direction, and can move relative to the connecting tube 2 along the second direction, so that the focusing lens 34 can move relative to the connecting tube 2 along the second direction, and when it moves to the first preset position, it is fixed by the two top screws of the first top screw group; the two top screws of the second top screw group are symmetrically arranged in the third direction, and can move relative to the connecting tube 2 along the third direction, so that the focusing lens 34 can move relative to the connecting tube 2 along the third direction, and when it moves to the second preset position, it is fixed by the two top screws of the second top screw group; wherein, the second direction, the third direction and the first direction are perpendicular to each other in a horizontal plane.

[0066] In this way, the position of the focusing lens 34 in the second direction and / or the third direction can be adjusted by the first top screw group and / or the second top screw group to ensure that the light beam is coaxial with the focusing lens 34, and is fixed by the top screw, with a simple structure and convenient and fast operation.

[0067] Specifically, in one embodiment of the present invention, the focusing lens 34 is a double-cemented focusing lens 34. The double-cemented lens can effectively correct the chromatic aberration problem, and can effectively reduce astigmatism and distortion, thereby improving image quality; at the same time, the double-cemented lens can be designed more compactly due to the internal glass lens structure, thereby reducing the size and weight, and the double-cemented lens can provide a larger effective aperture, so that more light can pass through, thereby enhancing the brightness and transmittance of the optical system.

[0068] Specifically, the connecting tube 2 is made of a low thermal expansion alloy material; the air chamber 4 is made of an aluminum alloy material; and the window piece is made of a sapphire material. In this way, the thermal conductivity coefficients of the connecting tube 2 and the air chamber 4 are both low, thereby avoiding affecting the focusing lens 34 in the connecting tube 2 and the optical elements in the housing 1, and ensuring the detection accuracy of the high temperature resistant Raman probe 100.

[0069] It should be noted that the low thermal expansion alloy material is an alloy material with a relatively small thermal expansion coefficient, such as Hastelloy alloy, stainless steel and the like.

[0070] For details, please refer to Figures 1 to 4 The heat sink 6 is a multi-plate heat sink with a large heat dissipation area and high heat dissipation efficiency.

[0071] For details, please refer to Figure 2 and Figure 4 The end of the air chamber 4 connected to the insulation tube 5 or the end of the insulation tube 5 connected to the air chamber 4 is detachably mounted with a mounting seat 7, and the window sheet 35 is fixedly mounted on the mounting seat 7. In this way, the window sheet 35 can be quickly disassembled or installed by disassembling the mounting seat 7, thereby improving efficiency.

[0072] Furthermore, a groove is concavely provided in one end of the air chamber 4 connected to the insulation tube 5, or a groove is concavely provided in one end of the insulation tube 5 connected to the air chamber 4; the mounting seat 7 is disposed in the groove and fixedly connected to the bottom wall of the groove.

[0073] In this way, when the air chamber 4 is provided with the groove, the processing of the insulation tube 5 can be reduced, thereby improving the structural stability of the insulation tube 5; when the insulation tube 5 is provided with the groove, after disassembling the air chamber 4 and the insulation tube 5, the window piece 35 can be directly wiped without disassembling the mounting seat 7 and the insulation tube 5, thereby improving efficiency.

[0074] Further, based on the above-mentioned embodiment of "a groove is concavely provided in one end of the air chamber 4 connected to the insulation tube 5", a sealing ring is provided on the bottom wall of the groove, thereby improving the sealing performance of the air chamber 4.

[0075] It should be noted that, in the present invention, the mounting seat 7 may be threadedly connected to the air chamber 4 or the thermal insulation tube 5 , or may be snap-connected to the air chamber 4 or the thermal insulation tube 5 , and so on.

[0076] Furthermore, the mounting seat 7 is made of aluminum alloy material, which has low thermal conductivity, and is beneficial to reducing the overall thermal conductivity coefficient of the high temperature resistant Raman probe 100 .

[0077] Specifically, the air chamber 4 is flange-connected to the insulation tube 5. Furthermore, a first outer flange is provided at one end of the air chamber 4 close to the insulation tube 5, and a second outer flange is provided at one end of the insulation tube 5 close to the air chamber 4, and the first outer flange and the second outer flange are fixedly connected by screws. In this way, the air chamber 4 and the insulation tube 5 are convenient to disassemble. More specifically, based on the above-mentioned embodiment of "a groove is concavely provided at one end of the air chamber 4 connected to the insulation tube 5, or a groove is concavely provided at one end of the insulation tube 5 connected to the air chamber 4; the mounting seat 7 is provided in the groove and fixedly connected to the bottom wall of the groove", the air chamber 4 is connected to the insulation tube 5 through an outer flange, the mounting seat 7 is provided in the groove and fixedly connected to the bottom wall of the groove, and the mounting seat 7 only needs to fix the window sheet 35, thereby reducing the force on the mounting seat 7 and improving the stability of the window sheet 35.

[0078] Specifically, the side wall of the heat-insulating tube 5 is provided with an opening, and the opening is sealed by a seal. The opening is used to evacuate the gas in the heat-insulating tube 5, so that the heat-insulating tube 5 is in a vacuum state, further improving the heat-insulating effect.

[0079] Furthermore, based on the above-mentioned embodiment of "a connecting tube 2 is provided between the insulation tube 5 and the shell 1", an opening is also provided on the side wall of the connecting tube 2, and the opening is sealed by a seal, so that the connecting tube 2 is also in a vacuum state, which is beneficial to thermal insulation.

[0080] For details, please refer to Figure 2 and Figure 4, a light-extinguishing piece 8 is detachably mounted on one end of the cavity 41 away from the insulation tube 5. In this way, after the light beam that has not collided with the gas to be measured in the cavity 41 continues to propagate forward, it can be absorbed by the light-extinguishing piece 8, preventing the laser from irradiating other substances to generate stray light that interferes with the Raman scattered light and causes signal drift. At the same time, the light-extinguishing piece 8 is detachably mounted on the gas chamber 4, and can be removed and wiped when contaminants are attached to it, thereby improving the detection accuracy of the high-temperature resistant Raman probe 100.

[0081] It should be noted that, in the present invention, the detachable connection mode between the matting member 8 and the air chamber 4 is not limited, and may be a threaded connection, a snap connection, or the like.

[0082] For further information, see Figure 2 and Figure 4 The matte piece 8 is arranged in a cone shape and is gradually tapered in the direction toward the insulation tube 5 .

[0083] Specifically, in an embodiment of the present invention, the matte piece 8 is made of aluminum alloy material, which has low thermal conductivity, and is beneficial to reducing the overall thermal conductivity coefficient of the high temperature resistant Raman probe 100 .

[0084] For details, please refer to Figure 2 and Figure 4 The optical component 3 also includes a beam splitter 32 and a focusing lens 34. The focusing lens 34 is arranged at one end of the thermal insulation tube 5 close to the shell 1; the shell 1 includes a reflection cavity 11, an incident channel 12 and an exit channel 13. The reflection cavity 11 is connected to the thermal insulation tube 5, and the beam splitter 32 is arranged therein; the incident channel 12 is arranged at one side of the reflection cavity 11 in the second direction, and the signal transmitter 31 is arranged therein; the exit channel 13 is arranged at one end of the reflection cavity 11 away from the thermal insulation tube 5, and the signal receiver 33 is arranged therein; wherein the first direction and the second direction are arranged perpendicular to each other in a plane.

[0085] It should be noted that, in the present invention, the signal transmitter 31 emits a laser to the beam splitter 32, and the beam splitter 32 changes the direction of the light beam to the focusing lens 34. The light beam is focused by the focusing lens 34, passes through the insulation tube 5, and is emitted into the cavity through the window piece 35. The light beam at the focal position collides with the gas to be measured that passes into the cavity to generate Raman scattered light. The Raman scattered light is collimated into parallel light by the focusing lens 34, and then transmitted to the beam splitter 32 and enters the signal receiving part.

[0086] Also, see the comparison Figure 1 and Figure 3 ,or Figure 2 and Figure 4 .exist Figure 1 , Figure 2 In the embodiment, the air inlet pipe and the air outlet pipe on the air chamber 4 are arranged opposite to each other, so that the focus of the laser can be placed at the midpoint of the air inlet pipe and the air outlet pipe; Figure 3 , Figure 4 In the embodiment, the air inlet pipe and the air outlet pipe on the air chamber 4 are staggered, so that after the gas enters the air chamber 4 through the air inlet pipe, it can travel more fully in the air chamber 4 and then flow out through the outlet pipe.

[0087] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A high temperature resistant Raman probe, characterized in that: The high temperature resistant Raman probe comprises: case; An optical component, comprising a signal transmitter, a signal receiver and a window sheet, wherein the signal transmitter and the signal receiver are arranged in the housing; an air chamber, disposed on one side of the housing, having a cavity for introducing the gas to be detected, wherein the cavity extends along a first direction; and The insulation tube is detachably installed between the shell and the air chamber, and one end of which is fixed on the air chamber and facing the window piece, and is made of insulation material. The window piece is detachably arranged at one end of the cavity close to the insulation tube or one end of the insulation tube close to the cavity.

2. The high temperature resistant Raman probe according to claim 1, characterized in that: One end of the air chamber connected to the insulation tube or one end of the insulation tube connected to the air chamber is detachably mounted with a mounting seat, and the window piece is fixedly mounted on the mounting seat.

3. The high temperature resistant Raman probe according to claim 2, characterized in that: A groove is concavely provided in one end of the air chamber connected to the heat-insulating tube, or a groove is concavely provided in one end of the heat-insulating tube connected to the air chamber; The mounting seat is arranged in the groove and is fixedly connected to the bottom wall of the groove.

4. The high temperature resistant Raman probe according to any one of claims 1 to 3, characterized in that: A first outer flange is provided at one end of the air chamber close to the insulation tube, and a second outer flange is provided at one end of the insulation tube close to the air chamber. The first outer flange and the second outer flange are fixedly connected by screws.

5. The high temperature resistant Raman probe according to claim 1, characterized in that: The side wall of the heat insulation pipe is provided with an opening, and the opening is sealed by a sealing member.

6. The high temperature resistant Raman probe according to claim 1, characterized in that: A heat sink is provided between the heat insulation tube and the shell.

7. The high temperature resistant Raman probe according to claim 6, characterized in that: The optical assembly also includes a focusing lens; A connecting pipe is provided between the heat insulation pipe and the shell, the heat sink is provided on the outer periphery of the connecting pipe, and the focusing lens is provided at one end of the connecting pipe connected to the shell.

8. The high temperature resistant Raman probe according to claim 7, characterized in that: At least a first jackscrew group and a second jackscrew group are inserted into the portion of the connecting tube corresponding to the focusing lens, and the first jackscrew group and the second jackscrew group respectively include two jackscrews; The two top screws of the first top screw group are symmetrically arranged in the second direction and can move relative to the connecting tube along the second direction, so that the focusing lens can move relative to the connecting tube along the second direction and be fixed by the two top screws of the first top screw group when the focusing lens moves to the first preset position; The two top screws of the second top screw group are symmetrically arranged in the third direction and can move relative to the connecting tube along the third direction, so that the focusing lens can move relative to the connecting tube along the third direction and be fixed by the two top screws of the second top screw group when the focusing lens moves to the second preset position; The second direction, the third direction and the first direction are perpendicular to each other in a horizontal plane.

9. The high temperature resistant Raman probe according to claim 7, characterized in that: The focusing lens is a double-cemented focusing lens; The connecting pipe is made of low thermal expansion alloy material; The air chamber is made of aluminum alloy material; The window piece is made of sapphire material; The heat sink is a multi-plate heat sink.

10. The high temperature resistant Raman probe according to claim 1, characterized in that: A matte piece is detachably mounted on one end of the cavity away from the insulation tube; The matting piece is arranged in a cone shape, and is arranged to be gradually contracted in a direction toward the heat insulation tube; The optical assembly further comprises a beam splitter and a focusing lens, wherein the focusing lens is arranged at one end of the heat insulation tube close to the shell; The housing comprises: A reflective cavity, connected to the heat-insulating tube, in which the beam splitter is arranged; an incident channel, which is arranged at one side of the reflective cavity in the second direction and in which the signal transmitter is arranged; and An exit channel, which is arranged at one end of the reflection cavity away from the heat insulation tube, and in which the signal receiver is arranged; The first direction and the second direction are arranged perpendicular to each other in a plane.

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