Regulating device of gas concentration detection equipment and gas concentration detection equipment

Abstract

The utility model relates to an adjusting device of gas concentration detection equipment and the gas concentration detection equipment, the gas concentration detection equipment comprises a light pipe and reflectors arranged at the two ends of the light pipe, the light pipe is used for introducing gas and laser, the face, right facing the light pipe, of each reflector inclines by a preset angle relative to the axis of the light pipe, and the adjusting device comprises an adjusting disc and a magnetic sleeve; wherein the magnetic sleeve is sleeved on the light pipe, adsorbs the adjusting disc to press the reflector on the end face of the light pipe, and allows the adjusting disc to drive the reflector to move relative to the light pipe. According to the adjusting device of the gas concentration detection equipment, in the process that the reflector is driven to rotate relative to the light tube, the emitting direction and the reflecting direction of the laser entering the light tube are changed, a complex adjusting mechanism is not needed, and due to the fact that the end of the light tube is basically flat in the machining process and the reflector is tightly attached to the end of the light tube, the machining precision is greatly improved. Therefore, the angle of the reflector is adjusted only by rotating the adjusting disc, and the adjusting efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of gas concentration detection, and in particular to an adjusting device of a gas concentration detection equipment and the gas concentration detection equipment. BACKGROUND

[0002] Cavity ring-down spectroscopy is a high-sensitivity technique for measuring optical absorption in a gas, liquid, or solid sample. It is based on the phenomenon that light gradually attenuates after multiple reflections in a highly reflective optical cavity, and the degree of absorption of a specific wavelength of light by the sample is determined by accurately measuring the decay of light intensity over time. Due to multiple reflections of light in the cavity, the effective path length is greatly increased, so cavity ring-down spectroscopy can detect extremely low concentrations of substances and is widely used to measure gas component concentrations.

[0003] The optical cavity is composed of two or more highly reflective mirrors, and the angle and position of the mirrors need to be adjusted to align the mirrors to ensure that the laser beam can be accurately reflected between the mirrors without escaping the optical cavity.

[0004] The common gas concentration detection equipment on the market has a complex mirror adjusting mechanism, and the adjusting process is complex in actual use, and it is not easy to disassemble and assemble, so the working efficiency needs to be improved. The utility model discloses a kind of adjusting devices of gas concentration detection equipment and the gas concentration detection equipment.

[0005] The present disclosure aims to overcome the deficiencies of the prior art and provide an adjusting device of a gas concentration detection equipment and the gas concentration detection equipment.

[0006] According to a first aspect of the present disclosure, an adjusting device of a gas concentration detection equipment is provided, the gas concentration detection equipment comprising an optical tube, mirrors arranged at both ends of the optical tube, the optical tube being used for introducing gas and laser, and one side of the mirror facing the optical tube being inclined at a preset angle relative to the optical tube axis, the adjusting device comprising:

[0007] An adjusting disc;

[0008] A magnetic sleeve is provided on the optical tube and adsorbs the adjusting disc to press the mirror against the end face of the optical tube, and allows the adjusting disc to drive the mirror to move relative to the optical tube.

[0009] In one embodiment of the present disclosure, the adjusting disc comprises:

[0010] A fixing ring is provided on the end of the optical tube;

[0011] A claw disc is detachably arranged on the fixing ring and is configured to press the mirror against the end face of the optical tube through the fixing ring under the adsorption of the magnetic sleeve.

[0012] In one embodiment of the present disclosure, the disc body of the claw disc has coaxially and stepwisely arranged first and second positioning holes, the first positioning hole has a larger hole diameter than the second positioning hole, the claw disc is sleeved on the light pipe through the first positioning hole, and the mirror is installed through the second positioning hole. The claw disc further has a positioning column arranged on the disc body, and the fixing ring is sleeved on the positioning column and abuts against the shaft shoulder between the disc body and the positioning column.

[0013] In one embodiment of the present disclosure, the positioning column and the shaft shoulder are provided with at least two glue dispensing holes surrounding the second positioning hole.

[0014] In one embodiment of the present disclosure, the fixing ring and the positioning column are detachably connected through at least two screws surrounding the positioning column.

[0015] In one embodiment of the present disclosure, the fixing ring has a mounting hole matched with the positioning column, the mounting hole edge is provided with a notch for the screw rod of the screw to pass through, and the screw nut abuts against the end surface of the fixing ring.

[0016] In one embodiment of the present disclosure, the positioning column is further provided with an annular mounting groove on the hole wall of the second positioning hole, and is configured to place an annular wear-resistant piece, so that the positioning column presses the mirror on the end surface of the light pipe through the annular wear-resistant piece.

[0017] In one embodiment of the present disclosure, the adjusting device further includes a stop ring, the stop ring is sleeved in the annular circumferential groove of the light pipe, and is configured to prevent the magnetic sleeve from being separated from the light pipe.

[0018] According to a second aspect of the present disclosure, a gas concentration detection device is provided, which includes a light pipe, a mirror, a laser emitter for emitting laser into the light pipe, a gas pipeline for introducing air into the light pipe, an oscilloscope for detecting a light path stabilization signal, and the adjusting device of any one of the above embodiments, the mirror is opposite to one side of the light pipe and is inclined at a preset angle relative to the axis of the light pipe.

[0019] One beneficial effect of the adjusting device of the gas concentration detection equipment of the present disclosure is that the magnetic sleeve adsorbs the adjusting disc to press the mirror against the end face of the light pipe, in the process of rotating the laser to the one end of the adjusting disc, the mirror is driven to rotate relative to the light pipe, since the side of the mirror facing the end face of the light pipe is provided with a slight inclination angle relative to the vertical direction, the exit direction of the laser entering the light pipe is also changed, in the process of rotating the other end of the adjusting disc, the reflection direction of the laser is also changed, the adjusting disc is rotated until the stable signal of the standing wave mode is obtained by the detection element such as the oscilloscope, and the adjustment of the mirror is completed. By using the adjusting device of the gas concentration detection equipment of the present disclosure, a complex adjusting mechanism is not needed, since the end of the light pipe basically reaches flatness in the process of machining, and the mirror is tightly attached to the end of the light pipe, therefore, only by rotating the adjusting disc to adjust the angle of the mirror, the efficiency of the adjustment is greatly improved.

[0020] The gas concentration detection equipment of the present disclosure comprises the adjusting device, therefore has the same technical effects as the adjusting device, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0022] Figure 1 is a structural schematic view of a gas concentration detection equipment and adjusting device assembly provided in an embodiment of the present disclosure;

[0023] Figure 2 is an exploded structural schematic view of a gas concentration detection equipment and adjusting device assembly provided in an embodiment of the present disclosure;

[0024] Figure 3 is an axial cross-sectional schematic view of the gas concentration detection equipment and adjusting device after installation provided in an embodiment of the present disclosure;

[0025] Figure 4 is a structural schematic view of a fixing ring provided in an embodiment of the present disclosure;

[0026] Figure 5 is a structural schematic view of a claw disc provided in an embodiment of the present disclosure.

[0027] Figures 1-5 The one-to-one correspondence between the names of the components and the reference numerals in the drawings is as follows:

[0028] 1-adjusting disc; 11-fixing ring; 111-mounting hole; 12-claw disc; 121-first positioning hole; 122-second positioning hole; 123-positioning column; 124-gel dispensing hole; 125-annular mounting groove;

[0029] 2 - magnetic sleeve; 3 - light pipe; 31 - annular circumferential groove; 4 - mirror; 5 - stop ring. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present disclosure unless otherwise specifically stated.

[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the disclosure and its applications or uses.

[0032] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.

[0033] In all examples shown and discussed herein, any specific values should be interpreted as merely illustrative and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0034] Note that similar reference numerals and letters indicate similar items throughout the drawings, and thus once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0035] In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used to describe relative positions between the relevant parts, and are not intended to limit the absolute positions of the relevant parts.

[0036] In this document, "first", "second", and the like are used to distinguish between the relevant parts from each other, and are not intended to indicate the importance and order, and the premise of each other.

[0037] In this document, "equal", "same", and the like are not strictly limited in the mathematical and / or geometric sense, but also include the errors allowed by those skilled in the art in manufacturing or use, and the like.

[0038] The existing gas concentration detection device is provided with a complex mirror adjusting device, which cannot achieve the purpose of rapid adjustment. Therefore, the present disclosure provides a simple structure of the adjusting device of the gas concentration detection device and the gas concentration detection device. For ease of understanding, the specific structure of the adjusting device of the gas concentration detection device and the gas concentration detection device of the present disclosure will be described in detail below with reference to Figures 1-5

[0039] Referring to Figure 1 , Figure 2 ​The gas concentration detection device comprises a light pipe 3, and mirrors 4 arranged at two ends of the light pipe 3, the light pipe 3 is used for passing in gas and laser, and the mirrors 4 are inclined at a preset angle relative to the axis of the light pipe 3 on the side facing the light pipe 3, and the adjusting device comprises an adjusting disc 1 and a magnetic sleeve 2, wherein the magnetic sleeve 2 is sleeved on the light pipe 3 and adsorbs the adjusting disc 1 to press the mirrors 4 against the end surface of the light pipe 3, and allows the adjusting disc 1 to drive the mirrors 4 to move relative to the light pipe 3.

[0040] Specifically, the gas concentration detection device mainly comprises the light pipe 3 and the mirrors 4 arranged on the two sides of the light pipe 3, the light pipe 3 is used for passing in laser and the gas to be detected, the mirror 4 has a special coating on the surface to realize the characteristic of high reflectivity, and the mirrors 4 arranged on the two sides of the light pipe 3 are oppositely arranged, after a monochromatic laser is emitted from one side, when the laser mode matches the optical cavity mode, the laser will be reflected back and forth between the mirrors to form a stable standing wave. Therefore, the position and angle of the mirror 4 are quite crucial to whether the stable standing wave can be formed.

[0041] The position of the mirror 4 only needs to be kept aligned with the two mirrors 4 on the opposite side, that is, the projections of the two mirrors 4 coincide along the axis direction of the light pipe 3, and it is very easy to realize, for example, the mirror 4 is attached to the two sides of the light pipe 3 and completely blocks the entrance of the optical cavity, so that the positions of the mirrors 4 are aligned with each other. Therefore, the adjustment of the mirror 4 mainly lies in adjusting the angle of the mirror 4.

[0042] The existing mechanical processing technology is already relatively mature, the end surfaces of the light pipe 3 are very smooth in the process of manufacturing and processing, and the perpendicularity of the end surfaces on the two sides is also relatively good, and basically meets the parallel requirement of the two end surfaces, so the adjusting disc 1 and the magnetic sleeve 2 are arranged, the magnetic sleeve 2 is fixedly sleeved on the light pipe 3, the mirror 4 is installed in the adjusting disc 1, and at least a portion of magnetic conductive material is arranged on the adjusting disc 1, so that the adjusting disc 1 can press the mirror 4 against the end surface of the light pipe 3 under the adsorption of the magnetic sleeve 2, and the end surface of the light pipe 3 is relatively parallel in the process of processing, and there may be only a small inclination angle.

[0043] The adjusting disc 1 is also sleeved on the end of the light pipe 3 and can drive the mirror 4 to rotate along the axis direction of the light pipe 3. The side of the mirror 4 close to the end surface of the light pipe 3 is inclined at a preset angle relative to the axis of the light pipe 3 in the disclosure, and the preset angle is close to 90°, that is, the inclination angle between the inclined surface of the mirror 4 and the vertical direction is very small. The adjusting disc 1 presses the inclined surface of the mirror 4 against the end surface of the light pipe 3 under the adsorption of the magnetic sleeve 2, and when the adjusting disc 1 rotates, the mirror 4 rotates relative to the light pipe 3 under the driving of the adjusting disc 1, so that the direction of the laser entering the light pipe 3 changes, and the direction of the reflection of the laser also changes when the adjusting disc 1 on the other side rotates.

[0044] The adjustment of the mirror 4 generally includes the following process: firstly, through visual inspection or using low-power visible laser assistance to make rough adjustment, ensuring that the laser beam is approximately located in the center of the mirror 4, forming a sandglass-shaped light path with thick sides and thin middle. Then, slightly rotate the adjusting disc 1, and obtain the stable signal of the standing wave mode through the detection element such as an oscilloscope.

[0045] There is indeed a refraction angle when the laser exits through the inclined surface of the mirror 4, but since the inclined angle of the inclined surface of the mirror 4 with the vertical direction is very small, the refraction deviation is not large. In addition, since the refractive index is stable, the refraction angle is a fixed value, and therefore does not affect the adjustment.

[0046] Working process:

[0047] The magnetic sleeve 2 is fixedly sleeved on one side end of the light pipe 3, the mirror 4 is installed in the adjusting disc 1, the adjusting disc 1 is sleeved on the end of the light pipe 3, and the same installation process is also performed on the other side end of the light pipe 3. The adjusting disc 1 is adsorbed by the magnetic sleeve 2, and the mirror 4 is pressed against the end surface of the light pipe 3. Rotating the adjusting disc 1 drives the mirror 4 to rotate relative to the axis direction of the light pipe 3. Since the side of the mirror 4 close to the end surface of the light pipe 3 is provided with a slight inclined angle with the vertical direction, the exit direction of the laser entering the light pipe 3 is also changed. Rotating the adjusting disc 1 until the stable signal of the standing wave mode is obtained through the detection element such as an oscilloscope, and the adjustment of the mirror 4 is completed.

[0048] The adjusting device of the gas concentration detection device of the present disclosure. The mirror 4 is pressed against the end surface of the light pipe 3 by the magnetic sleeve 2 adsorbing the adjusting disc 1. During the process of rotating the laser incident adjusting disc 1, the mirror 4 is driven to rotate relative to the light pipe 3. Since the side of the mirror 4 close to the end surface of the light pipe 3 is provided with a slight inclined angle with the vertical direction, the exit direction of the laser entering the light pipe 3 is also changed. During the process of rotating the other end adjusting disc 1, the reflection direction of the laser is also changed. Rotating the adjusting disc 1 until the stable signal of the standing wave mode is obtained through the detection element such as an oscilloscope, and the adjustment of the mirror 4 is completed. Without complex adjustment mechanism, taking advantage of the characteristics that the end of the light pipe 3 is flat, only by rotating the adjusting disc 1 to adjust the angle of the mirror 4, the efficiency of the adjustment is greatly improved.

[0049] Reference Figure 3 In one embodiment, the adjusting disc 1 includes a fixed ring 11 and a jaw disc 12, wherein the fixed ring 11 is sleeved on the end of the light pipe 3; the jaw disc 12 is detachably arranged on the fixed ring 11, and is configured to press the mirror 4 against the end surface of the light pipe 3 through the fixed ring 11 under the adsorption of the magnetic sleeve 2.

[0050] Specifically, the fixing ring 11 is made of a good magnetic conductive material, the magnetic sleeve 2 can adsorb the fixing ring 11, and the fixing ring 11 is axially displaced along the optical pipe 3. The clamping jaw disc 12 is fixedly connected with the fixing ring 11 in a detachable manner, and the fixing ring 11 can be fixed by screws, bolts, adhesives and the like. Under the adsorption of the magnetic sleeve 2, the clamping jaw disc 12 is pushed to press the reflector 4 against the end surface of the optical pipe 3. The clamping jaw disc 12 can be made of a light metal material. After the clamping jaw disc 12 is installed with the reflector 4, the center of gravity is deviated to one side of the reflector 4, so that the reflector 4 is pressed against the end surface of the optical pipe 3.

[0051] Referring to Figure 5 In one embodiment, the disc body of the clamping jaw disc 12 has coaxially arranged first and second positioning holes 121 and 122 in a stepped manner. The first positioning hole 121 has a larger diameter than the second positioning hole 122. The clamping jaw disc 12 is sleeved on the optical pipe 3 through the first positioning hole 121 and is installed with the reflector 4 through the second positioning hole 122. The clamping jaw disc 12 further has a positioning column 123 arranged on the disc body. The fixing ring 11 is sleeved on the positioning column 123 and abuts against the shoulder between the disc body and the positioning column 123.

[0052] Specifically, the first positioning hole 121 is arranged axially close to the end of the optical pipe 3. The diameter of the first positioning hole 121 is larger than that of the second positioning hole 122 and slightly larger than the outer diameter of the optical pipe 3. The first positioning hole 121 is sleeved on the end of the optical pipe 3 in a clearance fit. The diameter of the second positioning hole 122 is slightly larger than the diameter of the reflector 4, so as to realize the assembly of the reflector 4 and the second positioning hole 122. At the same time, part of the side wall of the reflector 4 is in contact with the hole wall of the second positioning hole 122. When the rotary adjusting disc 1 is rotated, the static friction between part of the side wall of the reflector 4 and the hole wall of the second positioning hole 122 drives the reflector 4 to rotate relative to the axial direction of the optical pipe 3. The positioning column 123 is used to connect with the fixing ring 11. The fixing ring 11 is sleeved on the positioning column 123 and is fixed on one side of the positioning column 123 in the axial direction. The side of the positioning column 123 away from the end surface of the optical pipe 3 is further provided with a central hole, so that the laser is emitted from the central hole into the optical pipe 3.

[0053] In one embodiment, the positioning column 123 and the shoulder are provided with at least two point gluing holes 124 surrounding the second positioning hole 122.

[0054] Specifically, the dispensing holes 124 are arranged in three and are arranged in sequence around the second positioning hole 122. The dispensing holes 124 are used to add sealant from the outside of the adjusting disc 1, on the one hand, the mirror 4 is preliminarily fixed to the end of the light pipe 3, and the light pipe 3 inlet realizes better sealing performance through the sealant, preventing the gas in the light pipe 3 from leaking from the contact position of the mirror 4 and the end surface of the light pipe 3. On the other hand, when the friction between the mirror 4 and the adjusting disc 1 is not enough to drive the mirror 4 to rotate, a part of the glue is dispensed on the side wall of the mirror 4, and after the glue solidifies, a small convex point is formed. When the adjusting disc 1 rotates, the positioning column 123 pushes the convex point and drives the mirror 4 to rotate. The gas concentration detection device of the present disclosure is mainly applied to the use scene with low sealing performance, such as detecting atmospheric composition concentration.

[0055] In one embodiment, the fixing ring 11 and the positioning column 123 are detachably connected through at least two screws around the positioning column 123.

[0056] Specifically, the positioning column 123 is divided into three sections by the dispensing holes 124, so three screws are arranged to fixedly connect the positioning column 123 and the fixing ring 11. The number of screws can be adjusted according to the number of dispensing holes 124, so that each section of the positioning column 123 is fixed by a screw, and the fixing effect of the claw disc 12 and the fixing ring 11 is ensured.

[0057] Referring to Figure 4 、 Figure 5 In one embodiment, the fixing ring 11 has a mounting hole 111 matched with the positioning column 123, and the edge of the mounting hole 111 is provided with a gap for the screw rod of the screw to pass through, and the screw nut abuts against the end surface of the fixing ring 11.

[0058] Specifically, the fixing ring 11 extends inwardly from the mounting hole 111 to the end surface, the fixing ring 11 is sleeved on the positioning column 123 through the mounting hole 111, and the end surface abuts against the shoulder between the disc body and the positioning column 123. The edge of the mounting hole 111, i.e. the edge of the extended end surface, is provided with a gap, and the number of gaps is equal to the number of screws.

[0059] In one embodiment, the positioning column 123 is also provided with an annular mounting groove 125, the annular mounting groove 125 is located on the hole wall of the second positioning hole 122, and is configured to place an annular wear-resistant part, so that the positioning column 123 presses the mirror 4 on the end surface of the light pipe 3 through the annular wear-resistant part.

[0060] Specifically, the positioning column 123 is provided with an annular mounting groove 125 located on the hole wall of the second positioning hole 122, an annular wear-resistant part is mounted in the annular mounting groove 125, the inner hole diameter of the annular wear-resistant part is equal to the hole diameter of the center hole, the mirror 4 is pressed against the end face of the light pipe 3 by the annular wear-resistant part and the positioning column 123, on the one hand, the annular wear-resistant part is located between the mirror 4 and the jaw disc 12, reducing the wear of the mirror 4 by the jaw disc 12 made of metal, on the other hand, the annular wear-resistant part will be elastically deformed when subjected to a compression force, so that it is completely attached to the mirror 4 and the jaw disc 12, compared with the direct contact between the jaw disc 12 and the mirror 4, the friction between the mirror 4 and the wear-resistant part is greater, therefore, when the jaw disc 12 rotates, the friction between the wear-resistant part and the mirror 4 drives the mirror 4 to rotate, thereby adjusting the angle of the mirror 4 relative to the axis of the light pipe 3.

[0061] Referring to Figure 2 In one embodiment, the adjusting device further comprises a stop ring 5, the stop ring 5 is sleeved in the annular circumferential groove 31 of the light pipe 3 and is configured to prevent the magnetic sleeve 2 from being separated from the light pipe 3.

[0062] Specifically, the light pipe 3 is provided with an annular circumferential groove 31, the annular circumferential groove 31 is located at the position where the adjusting disc 1 presses the mirror 4 when it is sleeved on the light pipe 3, the stop ring 5 is installed in the annular circumferential groove 31 of the light pipe 3 and tightly fits the groove through its internal shape, the magnetic sleeve 2 has the function of attracting and fixing the fixing ring 11, when the magnetic sleeve 2 contacts the stop ring 5, the stop ring 5 limits the displacement of the magnetic sleeve 2 towards the end of the light pipe 3, so that the fixing ring 11 is continuously attracted by the magnetic sleeve 2 to press the mirror 4 against the end face of the light pipe 3. The stop ring 5 is a clasp, specifically an inner clasp, which is embedded in the annular circumferential groove 31 of the light pipe 3 by external force, the clasp is an elastic metal part and can be magnetized, and tightly fits in the annular circumferential groove 31 by its elastic force, thereby achieving the functions of positioning and limiting the displacement of the magnetic sleeve 2.

[0063] In another embodiment, the magnetic sleeve 2 can be directly fixed on the light pipe 3 by adhesive means, and the stop ring 5 and the annular circumferential groove 31 on the light pipe 3 only play a positioning role.

[0064] It can effectively prevent the magnetic sleeve 2 from moving axially along the light pipe 3 and ensure that the relative positions between the magnetic sleeve 2 and other related components remain unchanged.

[0065] The present disclosure also provides a gas concentration detection device, which comprises a light pipe 3, a mirror 4, a laser emitter for emitting laser into the light pipe 3, a gas pipeline for introducing air into the light pipe 3, an oscilloscope for detecting a light path stability signal, and an adjusting device according to any one of the above embodiments, wherein the mirror 4 is inclined at a preset angle relative to the axis of the light pipe 3.

[0066] Specifically, a counterbore is formed on the light pipe 3 for inserting a gas pipeline to introduce the gas to be detected into the light pipe 3, and the oscilloscope can detect the signal of the standing wave mode. During the adjustment of the reflector 4, the signal that the adjustment of the reflector 4 is completed can be obtained by observing the signal of the oscilloscope. The side of the reflector 4 facing the light pipe 3 is provided with a slight inclination angle with the vertical direction. The adjustment device cooperates with the reflector 4 with the inclined side to realize the adjustment of the angle of the reflector 4, which simplifies the adjustment process and greatly improves the efficiency.

[0067] In addition, in order to facilitate better understanding, the use process of the adjustment device of the present disclosure will be described in detail below in combination with the actual adjustment process of the gas concentration detection device.

[0068] 1. Fix the light pipe 3, and insert the magnetic sleeve 2 into the light pipe 3. The stop ring 5 is clamped into the annular circumferential groove 31 provided on the light pipe 3. The magnetic sleeve 2 and the stop ring 5 will be attached to each other due to the magnetic force. In order to prevent the attachment at this time, the magnetic sleeve 2 is first pushed away to the distal end;

[0069] 2. Place the reflector 4 into the second positioning hole 122 of the clamping jaw disc 12, and then set the adjustment disc 1 on the end of the light pipe 3;

[0070] 3. First, hold the adjustment disc 1 with your hand, and then slowly move the distal end of the magnetic sleeve 2 close to the stop ring 5 until the magnetic sleeve 2 and the stop ring 5 are attached;

[0071] 4. The adjustment disc 1 is attracted by the magnetic sleeve 2 until the reflector 4 is pressed tightly on the end of the light pipe 3;

[0072] 5. Rotate the adjustment disc 1, which drives the reflector 4 to rotate. Rough adjustment is performed by visual observation or using a low-power visible laser to assist, to ensure that the laser beam is roughly located at the center of the reflector 4, forming a sandglass-shaped light path with thick sides and a thin middle;

[0073] 6. Rotate the adjustment disc 1 slightly;

[0074] 7. Repeat steps 1-6 on the other side of the light pipe 3 until a stable signal of the standing wave mode is obtained by the detection element such as the oscilloscope;

[0075] 8. Seal the reflector 4 to the end face of the light pipe 3 by dispensing glue through the dispensing hole 124;

[0076] 9. After the glue solidifies, remove the adjustment disc 1, the stop ring 5, and the magnetic sleeve 2 in sequence. Finally, coat the contact position between the reflector 4 and the end of the light pipe 3 with sealing glue, and insert the gas pipe into the counterbore provided on the light pipe 3 and coat it with sealing glue. Then the detection can be started.

[0077] Having described above several embodiments of the disclosure, any modifications and variations that fall within the scope of the described embodiments are also contemplated by the inventor(s). As such, the foregoing description is not intended to limit the scope of the disclosure, and it is recognized that modifications are contemplated which can provide one or more benefits and which are within the scope of the disclosure. The disclosure is defined by the appended claims.

Claims

1. An adjusting device for a gas concentration detecting apparatus, the gas concentration detecting apparatus comprising a light pipe (3) for passing in a gas and a laser light, and mirrors (4) provided at both ends of the light pipe (3), one face of the mirrors (4) facing the light pipe (3) being inclined at a predetermined angle with respect to an axis of the light pipe (3), characterized in that, The adjusting device comprises: an adjusting disc (1); a magnetic sleeve (2) sleeved on the light pipe (3) and attracting the adjusting disc (1) to press the mirror (4) against the end face of the light pipe (3) and allow the adjusting disc (1) to drive the mirror (4) to move relative to the light pipe (3).

2. The adjustment device of claim 1, wherein The adjusting disc (1) comprises: a fixing ring (11) sleeved on the end of the light pipe (3); a claw disc (12) detachably arranged on the fixing ring (11) and configured to press the mirror (4) against the end face of the light pipe (3) through the fixing ring (11) under the attraction of the magnetic sleeve (2).

3. The adjustment device of claim 2, wherein, The disc body of the claw disc (12) has coaxially and stepwisely arranged first and second positioning holes (121, 122), the first positioning hole (121) has a larger aperture than the second positioning hole (122), the claw disc (12) is sleeved on the light pipe (3) through the first positioning hole (121) and the mirror (4) is installed through the second positioning hole (122), and the claw disc (12) further has a positioning column (123) arranged on the disc body, the fixing ring (11) is sleeved on the positioning column (123) and abuts against the shaft shoulder between the disc body and the positioning column (123).

4. The adjustment device of claim 3, wherein The positioning column (123) and the shaft shoulder are provided with at least two point gluing holes (124) surrounding the second positioning hole (122).

5. The adjustment device of claim 3, wherein The fixing ring (11) and the positioning column (123) are detachably connected through at least two screws surrounding the positioning column (123).

6. The adjustment device of claim 5, wherein, The fixing ring (11) has a mounting hole (111) matched with the positioning column (123), the mounting hole (111) is provided with a notch at the edge for the screw rod of the screw to pass through, and the screw nut of the screw abuts against the end face of the fixing ring (11).

7. The adjustment device of claim 3, wherein The positioning column (123) is further provided with an annular mounting groove (125) on the hole wall of the second positioning hole (122) and is configured to place an annular wear-resistant part so that the positioning column (123) presses the mirror (4) against the end face of the light pipe (3) through the annular wear-resistant part.

8. The adjustment device of claim 1, wherein, The adjusting device further comprises a stop ring (5) sleeved in the annular circumferential groove (31) of the light pipe (3) and configured to prevent the magnetic sleeve (2) from being separated from the light pipe (3).

9. A gas concentration detecting apparatus characterized by comprising: The gas concentration detection device comprises the light pipe (3), the mirror (4), a laser emitter for emitting laser into the light pipe (3), a gas pipeline for introducing air into the light pipe (3), an oscilloscope for detecting the light path stability signal, and the adjusting device according to any one of claims 1-8, and the mirror (4) is opposite to one side of the light pipe (3) and is inclined at a preset angle relative to the axis of the light pipe (3).

Images