Optical fiber sensing gas chamber

Abstract

The utility model relates to an optical fiber sensing air chamber. The optical fiber sensing air chamber comprises an air chamber body with an accommodating space formed inside, and a filtering breathable net arranged on the air chamber body; the accommodating space can be communicated with the outside of the gas chamber body through the filtering breathable net, so that target gas outside the gas chamber body enters the accommodating space; the temperature control sensing part consists of a TEC temperature control module, a temperature sensor and an optical fiber sensing head; at least one part of the temperature control sensing part is accommodated in the accommodating space, so that the temperature sensor detects the actual temperature of the target gas, and the actual temperature of the target gas is controlled to reach a preset target temperature through the TEC temperature control module. The optical fiber sensing gas chamber is not only high in temperature control precision and high in temperature control response sensitivity, but also capable of greatly improving the precision, accuracy and stability of detecting and analyzing low-concentration target gas. The optical fiber sensing air chamber also has the advantages of simple and compact integral structure, small size and convenience in installation.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensing gas chamber technical field especially relates to a kind of optical fiber sensing gas chamber capable of realizing accurate temperature control of target gas. BACKGROUND

[0002] Current monitoring for various flammable and explosive gases, or monitoring for toxic and harmful gases, or monitoring for greenhouse gases, are increasingly valued, such monitoring can not only prevent future, thereby eliminating harm, but also realize safe production operation, thereby bringing more and greater benefits to society and atmospheric environment.

[0003] In order to prevent and eliminate the above-mentioned hazards, we need a gas detection and analysis instrument (for example, an optical fiber sensing gas chamber) that can effectively detect whether flammable and explosive gases, toxic and harmful gases, or greenhouse gases are at risk of leakage.

[0004] Currently, users have increasingly high requirements for the accuracy of gas detection and analysis, and in order to be able to detect and analyze target gases at lower concentrations with higher precision, it is necessary to accurately control the temperature of the target gas (the lower the temperature control precision inside the optical fiber sensing gas chamber, in other words, the greater the temperature deviation inside the optical fiber sensing gas chamber, the greater the deviation in the precision of concentration detection and analysis of the target gas).

[0005] However, conventional optical fiber sensing gas chambers do not implement accurate temperature control of target gases, and therefore conventional optical fiber sensing gas chambers have the defects of poor precision and poor stability in detecting and analyzing high-requirement and low-concentration (PPM / PPB, Parts Per Million / Parts Per Billion, parts per million / parts per billion) target gases. INVENTION CONTENTS

[0006] The optical fiber sensing gas chamber provided by the utility model aims to solve at least some of the defects of existing optical fiber sensing gas chambers.

[0007] The utility model embodiment provides a kind of optical fiber sensing gas chamber.The optical fiber sensing gas chamber includes:

[0008] Gas chamber body;The gas chamber body is formed inside containment space, and the gas chamber body is provided with filter gas-permeable net;

[0009] The containment space can be connected with the outside of the gas chamber body through the filter gas-permeable net, so that the target gas outside the gas chamber body enters the containment space;

[0010] The temperature control sensing component comprises a TEC temperature control module, a temperature sensor and an optical fiber sensing head; the temperature sensor and the optical fiber sensing head are arranged on the same surface of the TEC temperature control module;

[0011] At least a part of the temperature control sensing component is accommodated in the accommodating space, so that the temperature sensor detects the actual temperature of the target gas, and the actual temperature of the target gas is controlled to reach the preset target temperature by the TEC temperature control module.

[0012] In some embodiments, the gas chamber body comprises:

[0013] A gas chamber base; the gas chamber base extends in a first direction and is provided with an opening in a second direction;

[0014] A gas chamber cover plate; the gas chamber cover plate can be provided on the opening of the gas chamber base, and the filter gas permeable net is arranged on the gas chamber cover plate;

[0015] Wherein, the gas chamber base is provided with a pair of through holes on the opposite sides in the first direction, and at least a part of the optical fiber sensing head can pass through the through holes; the first direction and the second direction are orthogonal to each other.

[0016] In some embodiments, the gas chamber base and / or the gas chamber cover plate are provided with a sealing groove at the joint edge; the gas chamber body further comprises:

[0017] A sealing element; at least a part of the sealing element is accommodated in the sealing groove to fill the gap between the gas chamber base and the gas chamber cover plate at the joint edge.

[0018] In some embodiments, the optical fiber sensing head comprises:

[0019] A first sensing head base, a second sensing head base and an optical fiber component;

[0020] The first sensing head base is arranged on the second sensing head base, and both of them extend in the first direction;

[0021] The first sensing head base has a first preset length in the first direction, and the second sensing head base has a second preset length in the first direction;

[0022] The first sensing head base is provided with a V-shaped groove on the surface of the second sensing head base in the second direction, and at least a part of the optical fiber component is accommodated in the V-shaped groove;

[0023] Wherein, the first preset length is not more than the second preset length; the V-shaped groove penetrates through the opposite sides of the first sensing head base in the first direction.

[0024] In some embodiments, when the first preset length is less than the second preset length, the optical fiber component is a first optical fiber component;

[0025] When the first preset length is equal to the second preset length, the optical fiber component is a second optical fiber component.

[0026] In some embodiments, the first optical fiber component comprises:

[0027] a first input optical fiber, a first output optical fiber, a hollow optical fiber, and two quartz blocks;

[0028] Both of the two quartz blocks are fixedly installed on the surface of the second sensing head base body and symmetrically arranged on the opposite sides of the first sensing head base body in the first direction;

[0029] One end of the first input optical fiber is connected to any one of the quartz blocks, and the other end extends to the outside of the gas chamber body along the first direction through any one of the through holes;

[0030] One end of the first output optical fiber is connected to the other quartz block, and the other end extends to the outside of the gas chamber body along the first direction through the other through hole;

[0031] The hollow optical fiber is arranged in the V-shaped groove, and the hollow optical fiber, the first input optical fiber and the first output optical fiber are coaxially arranged, so that the laser in the first input optical fiber can be injected into the hollow optical fiber and emitted through the first output optical fiber.

[0032] In some embodiments, the second optical fiber component comprises:

[0033] a second input optical fiber, a second output optical fiber, and two collimators;

[0034] Both of the two collimators are fixedly installed in the V-shaped groove and symmetrically arranged on the opposite sides of the first sensing head base body in the first direction;

[0035] One end of the second input optical fiber is connected to any one of the collimators, and the other end extends to the outside of the gas chamber body along the first direction through any one of the through holes;

[0036] One end of the second output optical fiber is connected to the other collimator, and the other end extends to the outside of the gas chamber body along the first direction through the other through hole;

[0037] The second input optical fiber and the second output optical fiber are coaxially arranged so that the laser in the second input optical fiber can be injected into the V-shaped groove and emitted through the second output optical fiber.

[0038] In some embodiments, the target gas entering the accommodation space can flow into the hollow optical fiber or the V-shaped groove;

[0039] When the wavelength of the laser matches the wavelength absorbed by the target gas, the energy of the laser can be absorbed by the target gas, so that the laser forms energy loss;

[0040] Wherein, the energy loss of the laser is in direct proportion to the concentration parameter of the target gas.

[0041] In some embodiments, the air chamber base is provided with a wire hole on any side of the first direction; the TEC temperature control module comprises:

[0042] a module body and a first cable; the module body has opposite first and second surfaces in the second direction; the first cable extends from the module body to the outside of the air chamber body through the wire hole;

[0043] Wherein, the temperature sensor comprises: a sensor body and a second cable, and the second cable extends from the sensor body to the outside of the air chamber body through the wire hole;

[0044] The second sensor head base and the sensor body are fixedly installed on the first surface of the module body; the second surface of the module body abuts against the inner bottom surface of the air chamber base, so that the module body is fixed in the accommodation space.

[0045] In some embodiments, the first surface has a first symmetry axis parallel to the first direction and a second symmetry axis parallel to a third direction;

[0046] The second sensor head base has a third symmetry axis parallel to the first direction and a fourth symmetry axis parallel to the third direction;

[0047] The sensor body has a fifth symmetry axis parallel to the third direction;

[0048] The first symmetry axis and the third symmetry axis are coaxially arranged; the second symmetry axis, the third symmetry axis and the fifth symmetry axis are coaxially arranged;

[0049] Wherein, the third direction, the second direction and the first direction are orthogonal to each other.

[0050] The optical fiber sensing gas chamber has at least one beneficial effect that a novel optical fiber sensing gas chamber is provided, a temperature control sensing part is added to obtain an optical fiber sensing head with temperature control function; and a temperature sensor can be used to detect the actual temperature of the target gas in the gas chamber body, and then the actual temperature of the target gas is accurately controlled to reach the preset target temperature through the TEC temperature control module, so that the temperature deviation of the target gas in the gas chamber body is reduced, and the optical fiber sensing gas chamber can further detect and analyze the target gas with lower concentration with higher precision; in summary, the optical fiber sensing gas chamber has high temperature control precision, high temperature control response sensitivity, and can greatly improve the precision, accuracy and stability of detecting and analyzing the low-concentration target gas. In addition, the air inlet hole and the air outlet hole of the traditional optical fiber sensing gas chamber are replaced by the filtering air permeable net of the optical fiber sensing gas chamber, and the volume of the optical fiber sensing gas chamber is reduced, so that the optical fiber sensing gas chamber also has the advantages of simple overall structure, compact structure, small volume and convenient installation. BRIEF DESCRIPTION OF DRAWINGS

[0051] One or more embodiments are illustrated by way of example in the figures that are part of this disclosure and which are illustrative, but not restrictive, of the present embodiments, wherein elements having the same reference number designates like elements throughout the various figures, and wherein the figures do not necessarily bear a proportional relationship to each other.

[0052] Figure 1 A structural schematic view of the optical fiber sensing gas chamber provided by the first embodiment of the utility model (not showing the first cable and the second cable) is provided.

[0053] Figure 2 An exploded schematic view of the optical fiber sensing gas chamber provided by the first embodiment of the utility model is provided.

[0054] Figure 3 A structural schematic view of the temperature control sensing part provided by the first embodiment of the utility model is provided.

[0055] Figure 4 An exploded schematic view of the temperature control sensing part provided by the first embodiment of the utility model is provided.

[0056] Figure 5 A structural schematic view of the optical fiber sensing head provided by the first embodiment of the utility model is provided.

[0057] Figure 6 A structural schematic view of the optical fiber sensing head provided by the second embodiment of the utility model is provided.

[0058] Figure 7 A structural schematic view of the optical fiber sensing gas chamber provided by the third embodiment of the utility model is provided.

[0059] Figure 8 The utility model discloses a decomposition schematic view of optical fiber sensing gas chamber provided for the third embodiment of the utility model.

[0060] Reference signs:

[0061] 100, optical fiber sensing gas chamber;1001, first direction;1002, second direction;1003, third direction;1, gas chamber body;11, gas chamber base;12, gas chamber cover plate;13, sealing element;101, containing space;102, sealing groove;111, opening;112, through hole;113, wire passing hole;121, filter air permeable net;2, temperature control sensing component;21, TEC temperature control module;22, temperature sensor;23, optical fiber sensing head;211, module main body;212, first cable;221, sensor main body;222, second cable;231, first sensing head base body;232, second sensing head base body;233, first optical fiber component;2111, first surface;2112, second surface;2311, V-shaped groove;2331, first lead-in optical fiber;2332, first lead-out optical fiber;2333, hollow optical fiber;2334, quartz block;

[0062] 200, optical fiber sensing head;2001, first sensing head base body;2002, second sensing head base body;2003, second optical fiber component;2004, second lead-in optical fiber;2005, second lead-out optical fiber;2006, collimator;2007, V-shaped groove;2008, first direction;2009, second direction;

[0063] 300, optical fiber sensing gas chamber;3001, first direction;3002, second direction;3003, third direction;3004, V-shaped groove;31, gas chamber body;32, temperature control sensing component;301, containing space;302, air inlet hole;303, air outlet hole;311, cylindrical base;312, cylindrical cover plate;321, TEC temperature control module;322, temperature sensor;323, optical fiber sensing head;3011, assembly plane;3111, opening;3121, through hole;3122, wire passing hole;3211, module main body;3212, first cable;3213, first surface;3214, second surface;3221, sensor main body;3222, second cable;3231, first sensing head base body;3232, second sensing head base body;3233, first optical fiber component;3234, first lead-in optical fiber;3235, first lead-out optical fiber;3236, hollow optical fiber;3237, quartz block. DETAILED DESCRIPTION

[0064] For the convenience of understanding the utility model, the utility model will be described in more detail below in conjunction with the drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or one or more intervening elements can be present therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or one or more intervening elements can be present therebetween. The terms "upper", "lower", "inner", "outer", "bottom", etc. used in the specification indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third", etc. are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0065] Unless otherwise defined, all technical and scientific terms used in the specification are the same as those commonly understood by those skilled in the art to which the utility model belongs. The terms used in the specification of the utility model are only for the purpose of describing the specific embodiments and are not used to limit the utility model. The term "and / or" used in the specification includes any and all combinations of one or more related listed items.

[0066] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict between them.

[0067] Embodiment one:

[0068] Figure 1 The structure diagram of the optical fiber sensing air chamber provided for the first embodiment of the utility model (the first cable and the second cable are not shown). Figure 2 The exploded view of the optical fiber sensing air chamber provided for the first embodiment of the utility model. Figure 3 The structure diagram of the temperature control sensing component provided for the first embodiment of the utility model. Figure 4 The exploded view of the temperature control sensing component provided for the first embodiment of the utility model.

[0069] As Figures 1-4 shown, the optical fiber sensing air chamber 100 comprises: an air chamber body 1 and a temperature control sensing component 2.

[0070] The gas chamber body 1 is internally formed with a containing space 101; the filter gas-permeable net 121 is arranged on the gas chamber body 1, and the containing space 101 is in communication with the outside of the gas chamber body 1 through the filter gas-permeable net 121, so that the target gas outside the gas chamber body 1 enters the containing space 101; therefore, the containing space 101 is a gas chamber for containing the target gas.

[0071] In addition, the temperature control sensing component 2 comprises a TEC temperature control module 21, a temperature sensor 22 and a fiber sensing head 23.

[0072] It should be noted that the temperature sensor 22 and the fiber sensing head 23 are arranged on the same surface of the TEC temperature control module 21.

[0073] In the embodiment, at least a part of the temperature control sensing component 2 is accommodated in the containing space 101, so that the temperature sensor 22 detects the actual temperature of the target gas, and the TEC temperature control module 21 controls the actual temperature of the target gas to reach the preset target temperature.

[0074] Specifically, most of the conventional fiber sensing gas chambers do not have temperature control function, or cannot accurately control the temperature of the target gas in the gas chamber body 1, so that the temperature deviation in the gas chamber body 1 is large; wherein, the larger the temperature deviation in the gas chamber body 1 is, the larger the precision deviation of the concentration detection and analysis of the target gas is; therefore, the fiber sensing gas chamber 100 adds the temperature control sensing component 2 to obtain a fiber sensing head 23 capable of accurately controlling the temperature, so that the fiber sensing gas chamber 100 has the advantages of high temperature control precision and high temperature control response sensitivity compared with the conventional fiber sensing gas chamber, and can greatly improve the precision, accuracy and stability of the detection and analysis of the low-concentration target gas.

[0075] In addition, the air inlet hole and the air outlet hole of the conventional fiber sensing gas chamber are replaced by the filter gas-permeable net 121 of the fiber sensing gas chamber 100, and then the volume of the fiber sensing gas chamber 100 is reduced, so that the fiber sensing gas chamber 100 has the advantages of simple overall structure, compact structure, small volume and convenient installation compared with the conventional fiber sensing gas chamber.

[0076] It can be understood that the TEC temperature control module (TEC for ThermoElectric Cooler, simply referred to as thermoelectric cooler) is a temperature control device based on thermoelectric effect (mainly Peltier effect); in the TEC temperature control module, the TEC realizes directional transfer of heat by controlling the direction and size of current, so as to achieve the effect of refrigeration or heating; further, the TEC can make the temperature control more accurate, faster and more reliable.

[0077] Generally, the TEC is usually formed by alternating arrangement of P-type and N-type semiconductor materials and connected by metal electrodes to form a thermoelectric couple; specifically, when the current passes through the thermoelectric couple, according to the Peltier effect, heat absorption and heat release phenomena will occur at both ends of the thermoelectric couple, and then by adjusting the direction and size of the current, the refrigeration or heating effect of the TEC is controlled, thereby realizing the temperature control of the controlled object (for example, the target gas entering the above-mentioned gas chamber body 1).

[0078] Further, compared with the conventional temperature control module, the TEC temperature control module has the advantages of no mechanical moving parts, no noise, no pollution, fast response and accurate temperature control, etc., which makes the TEC temperature control module can meet the high-precision, high-reliability and fast-response temperature control occasions.

[0079] In some embodiments, referring to Figures 1-4 The gas chamber body 1 comprises a gas chamber base 11 and a gas chamber cover plate 12.

[0080] The gas chamber base 11 extends along a first direction 1001 and is provided with an opening 111 in a second direction 1002.

[0081] In addition, the gas chamber cover plate 12 can be provided at the opening 111 of the gas chamber base 11, and the filter gas permeable net 121 is arranged on the gas chamber cover plate 12.

[0082] In addition, the gas chamber base 11 is provided with a pair of through holes 112 on opposite sides in the first direction 1001, and at least a part of the optical fiber sensing head 23 can pass through the through holes 112; the first direction 1001 and the second direction 1002 are orthogonal to each other.

[0083] In the embodiments of the present application, the gas chamber body 1 is in the shape of a long strip.

[0084] In some embodiments, in combination with Figures 1-4 It can be seen that the gas chamber base 11 and / or the gas chamber cover plate 12 are provided with a sealing groove 102 at the joint edge; the gas chamber body 1 further comprises a sealing member 13.

[0085] It should be noted that at least a part of the sealing member 13 is accommodated in the sealing groove 102 to fill the gap between the joint edges of the gas chamber base 11 and the gas chamber cover plate 12.

[0086] It can be understood that the above-mentioned sealing member 13 can be a silicone rubber sealing ring, can also be glue, and can also be a welding seam; in other words, the gas chamber base 11 and the gas chamber cover plate 12 can be interference fit by the silicone rubber sealing ring, can also be bonded by the glue, and can also be connected by welding; of course, the gas chamber base 11 and the gas chamber cover plate 12 can also be fastened by screws.

[0087] Figure 5 The utility model provides a structure schematic view of optical fiber sensing head provided for first embodiment.

[0088] In some embodiments, as shown in Figure 5 The optical fiber sensing head 23 includes a first sensing head base body 231, a second sensing head base body 232, and an optical fiber component.

[0089] The first sensing head base body 231 is disposed on the second sensing head base body 232, and both extend along a first direction 1001.

[0090] In addition, the first sensing head base body 231 has a first preset length in the first direction 1001, and the second sensing head base body 232 has a second preset length in the first direction 1001.

[0091] Specifically, the first sensing head base body 231 is provided with a V-shaped groove 2311 on the surface thereof facing away from the second sensing head base body 232 in the second direction 1002, and at least a portion of the optical fiber component is accommodated in the V-shaped groove 2311.

[0092] Further, the first preset length is not more than the second preset length, and the V-shaped groove 2311 penetrates through the two opposite sides of the first sensing head base body 231 in the first direction 1001.

[0093] In the embodiments of the present application, since the first preset length is less than the second preset length, the above-mentioned optical fiber component is a first optical fiber component 233.

[0094] In some embodiments, referring to Figure 5 The first optical fiber component 233 includes a first incoming optical fiber 2331, a first outgoing optical fiber 2332, a hollow optical fiber 2333, and two quartz blocks 2334.

[0095] The two quartz blocks 2334 are both fixedly installed on the surface of the second sensing head base body 232 and symmetrically disposed on the two opposite sides of the first sensing head base body 231 in the first direction 1001.

[0096] In addition, one end of the first incoming optical fiber 2331 is connected to any one of the quartz blocks 2334, and the other end extends to the outside of the air chamber body 1 through any one of the through holes 112 in the first direction 1001.

[0097] In addition, one end of the first incoming optical fiber 2331 is connected to any one of the quartz blocks 2334, and the other end extends to the outside of the air chamber body 1 through any one of the through holes 112 in the first direction 1001.

[0098] Moreover, the hollow optical fiber 2333 is arranged in the V-shaped groove 2311, and the hollow optical fiber 2333, the first input optical fiber 2331 and the first output optical fiber 2332 are coaxially arranged, so that the laser in the first input optical fiber 2331 can be injected into the hollow optical fiber 2333 and emitted through the first output optical fiber 2332.

[0099] Generally, the purpose of using the quartz block 2334 is to facilitate the fixation of the first input optical fiber 2331 and the first output optical fiber 2332; and the first sensor head base 231 and the second sensor head base 232 are generally made of glass, quartz or ceramic materials.

[0100] Specifically, the core of the hollow optical fiber 2333 is hollow, and the first input optical fiber 2331 and the first output optical fiber 2332 are both spaced apart from the hollow optical fiber 2333 to facilitate the free flow of the target gas into and out of the hollow optical fiber 2333.

[0101] It can be understood that, in combination with Figure 2 and Figure 5 It can be understood that, the target gas entering the accommodation space 101 can flow into the hollow optical fiber 2333; when the wavelength of the laser matches the wavelength of the target gas that absorbs the laser, the energy of the laser can be absorbed by the target gas, so that the laser forms energy loss; wherein the energy loss of the laser is in a positive correlation with the concentration parameter of the target gas.

[0102] It should be noted that the end of the first input optical fiber 2331 away from the quartz block 2334 can be connected to a laser emitter to form a laser with a first energy; and the end of the first output optical fiber 2332 away from the quartz block 2334 can be connected to a detector to detect the second energy of the laser with the first energy after passing through the hollow optical fiber 2333, and the energy loss of the target gas to the laser is calculated by the difference between the first energy and the second energy, and then the gas concentration of the detected target gas is analyzed according to the positive correlation between the energy loss of the laser and the concentration parameter of the target gas.

[0103] In some embodiments, by Figures 1-5 It can be understood that the air chamber base 11 is provided with a wire hole 113 on any side in the first direction 1001; the TEC temperature control module 21 comprises a module main body 211 and a first cable 212.

[0104] Specifically, the module main body 211 has opposite first and second surfaces 2111 and 2112 in the second direction 1002; the first cable 212 extends from the module main body 211 to the outside of the air chamber body 1 through the wire hole 113.

[0105] The temperature sensor 22 comprises a sensor main body 221 and a second cable 222, and the second cable 222 extends from the sensor main body 221 to the outside of the air chamber body 1 through the wire hole 113.

[0106] Moreover, the first cable 212 and the second cable 222 can be sealed by glue at the position where they pass through the wire hole 113.

[0107] In addition, the second sensing head base 232 and the sensor main body 221 are fixedly installed on the first surface 2111 of the module main body 211, and the second surface 2112 of the module main body 211 abuts against the inner bottom surface of the air chamber base 11, so that the module main body 211 is fixed in the accommodation space 101.

[0108] In some embodiments, according to Figures 3-5 It can be known that the first surface 2111 has a first symmetry axis parallel to the first direction 1001 and a second symmetry axis parallel to the third direction 1003.

[0109] In the embodiments of the present application, the second sensing head base 232 has a third symmetry axis parallel to the first direction 1001 and a fourth symmetry axis parallel to the third direction 1003.

[0110] Further, the sensor main body 221 has a fifth symmetry axis parallel to the third direction 1003.

[0111] The first symmetry axis and the third symmetry axis are coaxially arranged, and the second symmetry axis, the third symmetry axis and the fifth symmetry axis are coaxially arranged.

[0112] In addition, the third direction 1003, the second direction 1002 and the first direction 1001 are orthogonal to each other.

[0113] Embodiment two:

[0114] Figure 6 The structure diagram of the optical fiber sensing head provided by the second embodiment of the present application.

[0115] Please refer to Figure 6 The optical fiber sensing head 200 comprises a first sensing head base 2001, a second sensing head base 2002 and an optical fiber component.

[0116] The first sensing head base 2001 is arranged on the second sensing head base 2002, and both of them extend along the first direction 2008.

[0117] In addition, the first sensing head base 2001 has a first preset length in the first direction 2008, and the second sensing head base 2002 has a second preset length in the first direction 2008.

[0118] Specifically, the first sensing head base 2001 is provided with a V-shaped groove 2007 on the surface thereof facing away from the second sensing head base 2002 in the second direction 2009, and at least a part of the optical fiber component is accommodated in the V-shaped groove 2007.

[0119] Further, the first preset length is not more than the second preset length, and the V-shaped groove 2007 penetrates through the opposite sides of the first sensing head base 2001 in the first direction 2008.

[0120] In the embodiment, the first preset length is equal to the second preset length, and the optical fiber component is the second optical fiber component 2003.

[0121] In some embodiments, please continue to refer to Figure 6 The second optical fiber component 2003 includes a second input optical fiber 2004, a second output optical fiber 2005 and two collimators 2006.

[0122] The two collimators 2006 are fixedly installed in the V-shaped groove 2007 and symmetrically arranged on the opposite sides of the first sensing head base 2001 in the first direction 2008.

[0123] In addition, one end of the second input optical fiber 2004 is connected to any one of the collimators 2006, and the other end extends away from the first sensing head base 2001 or the second sensing head base 2002 in the first direction 2008.

[0124] In addition, one end of the second input optical fiber 2004 is connected to any one of the collimators 2006, and the other end extends away from the first sensing head base 2001 or the second sensing head base 2002 in the first direction 2008.

[0125] Specifically, the second input optical fiber 2004 and the second output optical fiber 2005 are coaxially arranged, so that the laser in the second input optical fiber 2004 can be injected into the V-shaped groove 2007 and emitted through the second output optical fiber 2005.

[0126] Further, the collimator can be used to calibrate the above-mentioned laser, so that the laser in the second input optical fiber 2004 can be transmitted in a straight line to the second output optical fiber 2005 in the V-shaped groove 2007, so that the laser interacts with the target gas flowing into the V-shaped groove 2007 during the process of passing through the V-shaped groove 2007, thereby realizing the measurement of the gas concentration.

[0127] In some embodiments, by Figure 6It can be known that when the wavelength of the laser matches the wavelength of the target gas, the energy of the laser can be absorbed by the target gas flowing into the V-shaped groove 2007, so that the laser forms energy loss, and the energy loss of the laser is in direct proportion to the concentration parameter of the target gas.

[0128] In the embodiment of the application, one end of the second import optical fiber 2004 away from the collimator 2006 can be connected to a laser emitter to form laser with first energy, and one end of the second export optical fiber 2005 away from the collimator 2006 can be connected to a detector to detect second energy of the laser with the first energy after passing through the V-shaped groove 2007, and the energy loss of the laser is calculated by the difference between the first energy and the second energy, and then the gas concentration of the detected target gas is analyzed according to the direct proportion between the energy loss of the laser and the concentration parameter of the target gas.

[0129] Embodiment three:

[0130] Figure 7 The optical fiber sensing gas chamber provided by the third embodiment of the application is shown in the structural schematic view. Figure 8 The optical fiber sensing gas chamber provided by the third embodiment of the application is shown in the structural schematic view.

[0131] Reference Figures 7-8 It can be known that the optical fiber sensing gas chamber 300 comprises a gas chamber body 31 and a temperature control sensing component 32.

[0132] The inside of the gas chamber body 31 forms an accommodating space 301; the gas chamber body 31 is provided with an air inlet hole 302 and an air outlet hole 303, and the accommodating space 301 is connected with the outside of the gas chamber body 31 through the air inlet hole 302 and the air outlet hole 303, so that the target gas outside the gas chamber body 31 enters the accommodating space 301; therefore, the accommodating space 301 is a gas chamber for accommodating the target gas.

[0133] In addition, the temperature control sensing component 32 comprises a TEC temperature control module 321, a temperature sensor 322 and an optical fiber sensing head 323.

[0134] It should be noted that the temperature sensor 322 and the optical fiber sensing head 323 are arranged on the same surface of the TEC temperature control module 321.

[0135] In the embodiment of the application, at least part of the temperature control sensing component 32 is accommodated in the accommodating space 301, so that the temperature sensor 322 detects the actual temperature of the target gas, and the TEC temperature control module 321 controls the actual temperature of the target gas to reach the preset target temperature.

[0136] In some embodiments, as Figures 7-8As shown, the air chamber body 31 comprises a cylindrical base 311 and a pair of cylindrical cover plates 312.

[0137] The cylindrical base 311 extends along a first direction 3001 (i.e. the axial direction of the cylindrical base 311), and a pair of openings 3111 are arranged at opposite ends of the cylindrical base 311 in the first direction 3001. The air inlet hole 302 and the air outlet hole 303 are both arranged on the outer cylindrical surface of the cylindrical base 311 and both penetrate the accommodation space 301.

[0138] In addition, a pair of cylindrical cover plates 312 are arranged at the pair of openings 3111 of the cylindrical base 311 respectively. Each cylindrical cover plate 312 is provided with a through hole 3121, and any one cylindrical cover plate 312 is further provided with a wire hole 3122.

[0139] In addition, the accommodation space 301 of the cylindrical base 311 has an assembly plane 3011 in a second direction 3002 (i.e. the radial direction of the cylindrical base 311), and at least a part of the TEC temperature control module 321 can be fixedly installed on the assembly plane 3011. At least a part of the optical fiber sensing head 323 can pass through the through hole 3121.

[0140] In the embodiments of the present application, the air chamber body 31 is in a cylindrical shape. The first direction 3001 and the second direction 3002 are orthogonal to each other, and the second direction 3002 is perpendicular to the assembly plane 3011.

[0141] In some embodiments, in combination with Figures 7-8 It can be seen that the optical fiber sensing head 323 comprises a first sensing head base 3231, a second sensing head base 3232 and an optical fiber component.

[0142] The first sensing head base 3231 is arranged on the second sensing head base 3232, and both extend along the first direction 3001.

[0143] In addition, the first sensing head base 3231 has a first preset length in the first direction 3001, and the second sensing head base 3232 has a second preset length in the first direction 3001.

[0144] Specifically, the first sensing head base 3231 is provided with a V-shaped groove 3004 on the surface thereof facing away from the second sensing head base 3232 in the second direction 3002, and at least a part of the optical fiber component is accommodated in the V-shaped groove 3004.

[0145] Further, the V-shaped groove 3004 penetrates the opposite sides of the first sensing head base 3231 in the first direction 3001.

[0146] In the embodiment of the present application, the first preset length is smaller than the second preset length, i.e., the optical fiber component is the first optical fiber component 3233.

[0147] In some embodiments, according to Figures 7-8 It can be known that the first optical fiber component 3233 comprises a first input optical fiber 3234, a first output optical fiber 3235, a hollow optical fiber 3236, and two quartz blocks 3237.

[0148] The two quartz blocks 3237 are both fixedly installed on the surface of the second sensing head base 3232 and symmetrically arranged on the opposite sides of the first sensing head base 3231 in the first direction 3001.

[0149] In addition, one end of the first input optical fiber 3234 is connected to any one of the quartz blocks 3237, and the other end extends to the outside of the air chamber body 31 along the first direction 3001 through any one of the through holes 3121.

[0150] In addition, one end of the first input optical fiber 3234 is connected to any one of the quartz blocks 3237, and the other end extends to the outside of the air chamber body 31 along the first direction 3001 through any one of the through holes 3121.

[0151] In addition, one end of the first input optical fiber 3234 is connected to any one of the quartz blocks 3237, and the other end extends to the outside of the air chamber body 31 along the first direction 3001 through any one of the through holes 3121.

[0152] Generally, the purpose of using the quartz blocks 3237 is to facilitate the fixation of the first input optical fiber 3234 and the first output optical fiber 3235; and the first sensing head base 3231 and the second sensing head base 3232 are usually made of glass, quartz or ceramic materials.

[0153] Specifically, the core of the hollow optical fiber 3236 is hollow, and the first input optical fiber 3234 and the first output optical fiber 3235 both leave a gap with the hollow optical fiber 3236, so as to facilitate the target gas to freely enter and exit the hollow optical fiber 3236.

[0154] It can be understood that the target gas entering the containing space 301 can flow into the hollow optical fiber 3236; when the wavelength of the laser matches the wavelength of the target gas that absorbs the laser, the energy of the laser can be absorbed by the target gas, so that the laser forms energy loss; wherein the energy loss of the laser is in a positive relationship with the concentration parameter of the target gas.

[0155] It should be noted that the end of the first input optical fiber 3234 away from the quartz block 3237 can be connected to a laser emitter to form a laser having a first energy; and the end of the first output optical fiber 3235 away from the quartz block 3237 can be connected to a detector to detect a second energy of the laser having the first energy after passing through the hollow optical fiber 3236, and the energy loss of the laser caused by the target gas is calculated by the difference between the first energy and the second energy, and then the gas concentration of the detected target gas is analyzed according to the relationship that the energy loss of the laser is proportional to the concentration parameter of the target gas.

[0156] In some embodiments, the first energy is provided by Figures 7-8 It can be known that the TEC temperature control module 321 includes a module body 3211 and a first cable 3212.

[0157] Specifically, the module body 3211 has opposite first and second surfaces 3213 and 3214 in the second direction 3002; and the first cable 3212 extends from the module body 3211 to the outside of the air chamber body 31 through the wire hole 3122.

[0158] The temperature sensor 322 includes a sensor body 3221 and a second cable 3222, and the second cable 3222 extends from the sensor body 3221 to the outside of the air chamber body 31 through the wire hole 3122.

[0159] Moreover, the first and second cables 3212 and 3222 can be sealed by glue at the positions where they pass through the wire hole 3122.

[0160] In addition, the second sensing head base 3232 and the sensor body 3221 are both fixedly installed on the first surface 3213 of the module body 3211; and the second surface 3214 of the module body 3211 abuts against the assembly plane 3011 of the cylindrical base 311, so that the module body 3211 is fixed in the accommodation space 301.

[0161] In some embodiments, referring to Figures 7-8 It can be known that the first surface 3213 has a first symmetry axis parallel to the first direction 3001 and a second symmetry axis parallel to the third direction 3003.

[0162] In the embodiments of the present application, the second sensing head base 3232 has a third symmetry axis parallel to the first direction 3001 and a fourth symmetry axis parallel to the third direction 3003.

[0163] Further, the sensor body 3221 has a fifth symmetry axis parallel to the third direction 3003;

[0164] The first symmetry axis and the third symmetry axis are coaxially arranged.

[0165] In addition, the third direction 3003, the second direction 3002 and the first direction 3001 are orthogonal to each other, and the third direction 3003 is parallel to the assembly plane 3011.

[0166] In combination with the first embodiment, the second embodiment and the third embodiment, it can be seen that the gas inlet mode of the optical fiber sensing gas chamber can adopt the filtering gas permeable net, so as to be suitable for a free diffusion scene (that is, the target gas outside the gas chamber body enters the containing space through free diffusion); in addition, the gas inlet mode of the optical fiber sensing gas chamber can also adopt the gas inlet hole and the gas outlet hole, so as to be suitable for a gas pump connection scene (that is, the target gas outside the gas chamber body is introduced into the containing space through external pumping).

[0167] Specifically, compared with the gas inlet and outlet mode adopting the filtering gas permeable net, the gas inlet and outlet mode adopting the gas inlet hole and the gas outlet hole will make the overall structure of the optical fiber sensing gas chamber more complex, the structure is not compact, the volume is large, and the installation is not convenient due to the introduction of the external gas pump; therefore, the optical fiber sensing gas chamber adopts the gas inlet and outlet mode of the filtering gas permeable net instead of the gas inlet and outlet mode of the gas inlet hole and the gas outlet hole of the traditional optical fiber sensing gas chamber, so that the use of the external gas pump can be avoided, so that the optical fiber sensing gas chamber has the advantages of simple overall structure, compact structure, small volume and convenient installation.

[0168] In summary, the optical fiber sensing gas chamber provided by the embodiment of the present application adds a temperature control sensing component to obtain an optical fiber sensing head with temperature control function; and a temperature sensor can be used to detect the actual temperature of the target gas inside the gas chamber body, and then a TEC temperature control module is used to accurately control the actual temperature of the target gas to reach a preset target temperature, so as to reduce the temperature deviation of the target gas inside the gas chamber body, and further enable the optical fiber sensing gas chamber to detect and analyze the target gas with lower concentration with higher precision; as described above, the optical fiber sensing gas chamber not only has high temperature control precision and high temperature control response sensitivity, but also can greatly improve the precision, accuracy and stability of detecting and analyzing the low-concentration target gas. In addition, the gas inlet hole and the gas outlet hole of the traditional optical fiber sensing gas chamber are replaced by the filtering gas permeable net of the optical fiber sensing gas chamber, and the volume of the optical fiber sensing gas chamber is reduced, so that the optical fiber sensing gas chamber also has the advantages of simple overall structure, compact structure, small volume and convenient installation. Therefore, the optical fiber sensing gas chamber provided by the embodiment of the present application has certain novelty compared with the traditional optical fiber sensing gas chamber.

[0169] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, rather than limiting them; under the idea of the present application, the technical features in the above examples or different examples can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in detail for simplicity; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; 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 present application.

Claims

1. A fiber optic sensing cell, comprising: The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber.

2. The optical fiber sensing gas cell of claim 1, wherein, The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber.

3. The optical fiber sensing gas cell of claim 2, said gas cell base and / or said gas cell cover plate being provided with a sealing groove at the joint edge; characterized in that, The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber.

4. The optical fiber sensing gas cell of claim 2, wherein, The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber.

6. The optical fiber sensing gas cell of claim 5, wherein, The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application relates to an optical fiber sensing gas chamber. The application One end of the first outgoing fiber is connected to another of the quartz blocks, and the other end extends outside the gas chamber body along the first direction through another of the through holes; The hollow fiber is arranged in the V-shaped groove, and the hollow fiber, the first incoming fiber and the first outgoing fiber are coaxially arranged, so that the laser in the first incoming fiber can be injected into the hollow fiber and emitted through the first outgoing fiber.

7. The optical fiber sensing gas cell of claim 5, wherein, The second fiber component includes: A second incoming fiber, a second outgoing fiber and two collimators; Both of the collimators are fixedly installed in the V-shaped groove and symmetrically arranged on opposite sides of the first sensing head base in the first direction; One end of the second incoming fiber is connected to any one of the collimators, and the other end extends outside the gas chamber body along the first direction through any one of the through holes; One end of the second outgoing fiber is connected to the other collimator, and the other end extends outside the gas chamber body along the first direction through the other through hole; The second incoming fiber and the second outgoing fiber are coaxially arranged, so that the laser in the second incoming fiber can be injected into the V-shaped groove and emitted through the second outgoing fiber.

8. The optical fiber sensing gas chamber according to claim 6, wherein The target gas entering the accommodation space can flow into the hollow fiber or the V-shaped groove; When the wavelength of the laser matches the wavelength of the target gas that absorbs the laser, the energy of the laser can be absorbed by the target gas, so that the laser forms energy loss; Wherein, the energy loss of the laser is in direct proportion to the concentration parameter of the target gas.

9. The optical fiber sensing gas chamber according to claim 4, wherein the chamber base is provided with a wire hole on either side of the chamber base in the first direction; and The TEC temperature control module includes: A module body and a first cable; the module body has opposite first and second surfaces in the second direction; the first cable extends outside the gas chamber body from the module body through the wire hole; Wherein, the temperature sensor includes: a sensor body and a second cable, and the second cable extends outside the gas chamber body from the sensor body through the wire hole; The second sensing head base and the sensor body are both fixedly installed on the first surface of the module body; the second surface of the module body abuts against the inner bottom surface of the gas chamber base, so that the module body is fixed in the accommodation space.

10. The optical fiber sensing gas chamber according to claim 9, wherein The first surface has a first symmetry axis parallel to the first direction and a second symmetry axis parallel to a third direction; The second sensing head base has a third symmetry axis parallel to the first direction and a fourth symmetry axis parallel to the third direction; The sensor body has a fifth symmetry axis parallel to the third direction; The first symmetry axis and the third symmetry axis are coaxially arranged; the second symmetry axis, the third symmetry axis and the fifth symmetry axis are coaxially arranged; Wherein, the third direction, the second direction and the first direction are orthogonal to each other.

Images