CN113340838A - NDIR gas detection sensor optical path device - Google Patents
NDIR gas detection sensor optical path device Download PDFInfo
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Abstract
The invention relates to the technical field of gas detection sensors, and discloses an NDIR gas detection sensor light path device, which comprises a main light path component, a reflection component, a lower light path shell and a circuit board, wherein the main light path component and the lower light path shell form a cylindrical light emission chamber; the lower light path shell comprises a first through hole, a second through hole, a third through hole and a lower light cavity reflecting surface, and the first through hole is positioned in the center of the lower light cavity reflecting surface; the reflecting arc plate at the emitting position reduces the divergence angle of a light source and increases the utilization rate of light energy; the optical cavity is cylindrical, the optical path can be infinitely close to the circumferential length, the reflection times are increased, the optical path is enlarged, and meanwhile, the upper wall and the lower wall of the cylinder restrain light rays, so that the light rays are prevented from escaping out of the reflection cavity and losing light energy; the reflection arcs at the receiving part play a role in convergence, the light rays scattered for many times in the chamber reach the receiving reflection arcs, the reflection arcs play a role in convergence of the light rays, and the converged focus is an effective receiving surface of the detector.
Description
Technical Field
The invention relates to the technical field of gas detection sensors, in particular to an optical path device of an NDIR gas detection sensor.
Background
The gas detection sensor is often used in petrochemical, coal, steel, intelligent building, safe driving and other industries, detects surrounding gas concentration or pipeline leakage, and informs whether the surrounding gas environment is safe or whether the gas emission reaches the standard. In addition, the product can also be used in the medical industry, and through the test of the gas exhaled by people, when the gas exhaled by people in illness is definitely changed with normal people, the disease can be prevented in advance, and the product can be used for treating diseases which are difficult to be perceived by patients in the early stage of illness, such as canceration and the like; the current general commercial NDIR sensor detection method comprises the following steps that a light source (a traditional tungsten filament bulb, an MEMS light source, an LED or an LD) passes through a certain optical path and finally reaches a detector (a thermopile detector, a pyroelectric detector, a PD, a PIN or an APD), the detector converts an optical signal into an electric signal, and subsequent signal processing is carried out;
Lambert-Beer absorption law log (I/I0) — epsilon cl, where I0 is the light intensity at x-0, I is the light intensity at x-l, c is the molar concentration of the gas molecules, l is the optical path length, epsilon extinction factor, the larger the formula l, the more fully the gas is absorbed, the larger the signal change, and therefore the better the resolution and sensitivity of the sensor. The main stream NDIR sensor is designed in a limited space, and a main stream size platform is 4R, 7R or iSeries, so that manufacturers of the NDIR sensors spend great energy on the design of an optical path, the traditional optical path is a direct-projection type or an A-shaped type and a Z-shaped/W-shaped type extending from the direct-projection type or the A-shaped type, the traditional optical path is insufficient in space utilization, the optical path is short, and the resolution and the sensitivity are seriously influenced; because the traditional light source has a larger divergence angle, when the sensor is designed, if the light beam is not restricted, a large part of light cannot reach the detector and is wasted, so that the signal-to-noise ratio is reduced, and the resolution and the sensitivity are influenced.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an NDIR gas detection sensor optical path device which has the advantages of increasing the light energy utilization rate and the effective optical path and solves the problem that light beams cannot be constrained.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: an NDIR gas detection sensor optical path device comprises a main optical path component, a reflection component, a lower optical path shell and a circuit board, wherein the main optical path component and the lower optical path shell form a cylindrical light reflection chamber;
the lower light path shell comprises a first through hole, a second through hole, a third through hole and a lower optical cavity reflecting surface, the first through hole is positioned in the center of the lower optical cavity reflecting surface, the third through hole and the second through hole are formed in the lower optical cavity reflecting surface, a light source, an environment sensor and a detector are arranged on the circuit board, the environment sensor corresponds to the first through hole, the second through hole corresponds to the light source, and the third through hole corresponds to the detector;
the main light path assembly comprises a first shell, a second shell and an air vent, wherein the inner side wall of the first shell is provided with the second shell, at least one air vent is formed in the top of the second shell, an inner wall is arranged on the first shell and is a side reflecting surface of an optical reflecting cavity, an inner plane is arranged on the second shell and is an upper reflecting surface of the optical cavity, the inner plane is an upper reflecting surface of the optical cavity, and the bottom edge of the second shell is provided with the reflecting assembly.
Preferably, the reflection assembly includes reflection arc board, diapire and lateral wall, the bottom edge of second casing is close to the inside wall of first casing is provided with two reflection arc board, two be provided with between the reflection arc board the diapire, keep away from one side of diapire the inside wall of first casing is connected the lateral wall, the cross section and the longitudinal section curve of reflection arc board can be sharp, circular arc, elliptic arc, parabola, free curve.
By adopting the scheme, the arrangement of the two reflecting arc plates is beneficial to changing the position of light reflected in the first shell, one reflecting arc plate plays a role in convergence, light scattered for many times in the cavity of the first shell reaches the second reflecting arc plate, the second reflecting arc plate converges and turns the light, and the focal point is transmitted to the effective receiving surface of the detector; the reflecting arc plate has the functions of convergence and steering, and the effective utilization rate of the space volume is increased.
Preferably, the top of the second shell is provided with a through groove, a bottom plate is arranged in the through groove, and the bottom plate is connected with the reflecting arc plate through an adjusting assembly and a position adjusting assembly.
Through adopting above-mentioned scheme, support position control subassembly and adjusting part by the bottom plate to connect the reflection arc board by position control subassembly, the angle that the user steerable position control subassembly changed the reflection arc board, control adjusting part can rotate the reflection arc board.
Preferably, the bottom plate is arranged inside the through groove;
the position adjusting assembly comprises a base, universal balls and a connecting plate, the base is symmetrically arranged at the bottom of the bottom plate, the universal balls are movably connected to the inner side wall of the base, the connecting plate is arranged on the outer side wall of each universal ball, and the connecting plate is connected with the reflecting arc plate;
the adjusting assembly comprises a first rod body and a second rod body, the first rod body is arranged at the top of the connecting plate, and the first rod body is connected to the bottom of the second rod body in a sliding mode.
Through adopting above-mentioned scheme, the user is when adjusting the reflection cambered plate, and swivelling joint board, connecting plate then drive the reflection cambered plate and rotate, after rotating a certain position, presses the connecting plate, makes the connecting plate drive universal ball at the base internal rotation, when pressing, the body of rod two then slides in body of rod one, makes the height of connecting plate receive the restriction.
Preferably, the inner side wall of the bottom plate is rotatably connected with the first ring body, the inner side of the first ring body is provided with the second ring body, a limiting part is arranged between the first ring body and the second ring body, and the limiting part is rotatably connected with the second rod body.
By adopting the scheme, the first ring body rotates and simultaneously drives the limiting part to rotate on the inner side of the second ring body.
Preferably, the inside of the bottom plate is rotatably connected with a third rod body, a first gear is arranged on the outer side wall of the third rod body and meshed with the first ring body, and a knob is arranged at the top of the third rod body.
Through adopting above-mentioned scheme, when the user is adjusting the rotational position of connecting plate, revolve and twist the knob, the knob drives gear one and rotates, and gear drive ring body one rotates, and the ring body drives spacing portion and rotates, and the body of rod two in the spacing portion also begins to be circular motion this moment, and spacing portion is the hollow cylinder structure, is connected through the bearing between with the body of rod two.
Preferably, the inside wall of bottom plate rotates and connects ring body three, ring body three is located the top of ring body one, the lateral wall of the body of rod three is provided with gear two, gear two can with ring body three meshes and connects, the top of the body of rod two is provided with gear three, gear three with ring body three meshes and connects, body of rod one with body of rod two threaded connection.
By adopting the above scheme, when the rod body III rotates, the gear II can be driven to rotate, the gear II drives the ring body III to rotate, the ring body III can be meshed with the gear III to be connected, so that the rod body II is driven to rotate, and at the moment, the rod body I is lifted or descended.
Preferably, a rod body four is arranged at the bottom end of the rod body three, the rod body four is in sliding connection with the rod body three, and a spring is arranged between the rod body four and the rod body three.
By adopting the scheme, a user can press the third rod body to enable the third rod body to descend, the second gear and the third ring body are separated, and the spring is arranged to enable the third rod body to reset in the fourth rod body and enable the second gear to be in butt joint with the third ring body.
(III) advantageous effects
Compared with the prior art, the invention provides an NDIR gas detection sensor optical path device, which has the following beneficial effects:
according to the NDIR gas detection sensor light path device, the reflection arc plate at the emission position reduces the divergence angle of a light source, and the light energy utilization rate is increased; the optical cavity is cylindrical, the optical path can be infinitely close to the circumferential length, the reflection times are increased, the optical path is enlarged, and meanwhile, the upper wall and the lower wall of the cylinder restrain light rays, so that the light rays are prevented from escaping out of the reflection cavity and losing light energy; the reflecting arcs at the receiving part play a role in convergence, the light rays scattered for multiple times in the chamber reach the receiving reflecting arcs, the reflecting arcs play a role in convergence of the light rays, and the converging focus is an effective receiving surface of the detector; the reflecting arc has the functions of convergence and steering, and the effective utilization rate of the space volume is increased.
Drawings
FIG. 1 is a first perspective view of the present invention;
FIG. 2 is a schematic perspective view of the present invention;
FIG. 3 is a schematic top view of the additional base plate of the present invention;
FIG. 4 is a schematic view of the connection structure of the base plate, the position adjustment assembly and the adjustment assembly in the present invention;
FIG. 5 is an enlarged view of the structure at A in FIG. 4 according to the present invention;
FIG. 6 is a top view of the ring body of the present invention;
FIG. 7 is a schematic view of a connection structure of a third rod and a fourth rod according to the present invention;
FIG. 8 is a schematic view of the three-structure of the ring body of the present invention;
FIG. 9 is a cross-sectional optical path diagram of the present invention;
fig. 10 is a schematic structural diagram of the sensor of the present invention.
In the figure:
1. a main light path component; 11. a first housing; 111. an inner wall; 12. a second housing; 121. an inner plane; 13. a vent hole; 14. a through groove;
2. a reflective component; 21. a reflective arc plate; 22. a bottom wall; 23. a side wall;
3. a base plate;
4. a position adjustment assembly; 41. a base; 42. a universal ball; 43. a connecting plate;
5. an adjustment assembly; 51. a first rod body; 52. a second rod body; 53. a ring body I; 531. a limiting part; 532. a second ring body; 54. a third rod body; 541. a knob; 542. a first gear; 543. a second gear; 56. a rod body IV; 57. a third gear; 58. a ring body III; 59. a spring;
6. a bottom cover;
7. a circuit board; 71. a light source; 72. an environmental sensor; 73. a detector;
8. a lower light path housing; 81. a first through hole; 82. a second through hole; 83. a third through hole; 84. a lower optical cavity reflective surface;
9. and (5) a dustproof film.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
An NDIR gas detection sensor optical path device comprises a main optical path component 1, a reflection component 2, a lower optical path shell 8 and a circuit board 7, wherein the main optical path component 1 and the lower optical path shell 8 form a cylindrical light emitting cavity;
the lower light path housing 8 comprises a first through hole 81, a second through hole 82, a third through hole 83 and a lower light cavity reflecting surface 84, the first through hole 81 is located at the center of the lower light cavity reflecting surface 84, the third through hole 83 and the second through hole 82 are formed in the lower light cavity reflecting surface 84, a light source 71, an environmental sensor 72 and a detector 73 are arranged on the circuit board 7, the environmental sensor 72 corresponds to the first through hole 81, the second through hole 82 corresponds to the light source 71, and the third through hole 83 corresponds to the detector 73;
the main optical path assembly 1 includes a first housing 11, a second housing 12 and a vent hole 13, the second housing 12 is disposed on an inner side wall of the first housing 11, at least one vent hole 13 is disposed on a top of the second housing 12, an inner wall 111 is disposed on the first housing 11, the inner wall 111 is a side reflection surface of an optical reflection chamber, an inner plane 121 is disposed on the second housing 12, the inner plane 121 is an upper reflection surface of the optical chamber, and the reflection assembly 2 is disposed at a bottom edge of the second housing 12;
With reference to the figures 1-10 of the drawings,
the first through hole 81 corresponds to the environment chip 72 and is positioned in the center of the optical cavity, namely light reflection is not influenced, and changes of ambient temperature, humidity, pressure and the like can be quickly sensed, the second through hole 82 corresponds to the light source 71, light emitted by the light source 71 enters the optical cavity through the second through hole 82, the third through hole 83 corresponds to the detector 73 on the PCB, cavity light enters the detector 73 through the third through hole 83 to convert optical signals into electric signals for detection, and the reflecting surface 84 under the optical cavity restrains the light and limits the transmission of the light in the cavity;
the size of the sensor which is mainstream at present is cylindrical or square. As shown in fig. 9 below, if the maximum optical path is to be obtained in the circular cross section, it is usually an inscribed regular n-polygon of the circle, and if n is larger, the optical path is larger, and in the actual design, the maximum number of reflections n in the circular cross section can be calculated according to the spatial size of the sensor, the size of the light source, and the size of the detector;
assuming that the radius of the cylindrical chamber is r, the light source is an ideal laser with an infinitely small volume and a divergence angle of 0, the center of the light source is superposed with the center of the AB side of the inscribed positive n-polygon of the circle at a point D, and the emission direction of the light source is parallel to the AB, light emitted from the point D is reflected n times by the inner wall of the cylinder and finally returns to the point D, so that the optical path is equal to the perimeter of the inscribed positive n-polygon of the circle, and L is 2n.r.sin (BOD) is 2n.r.sin (180/n). Therefore, the larger n, the larger the optical length L.
In practical applications, the light source has a certain size, for example, the size of the light source is a × b × c, and the size a is in the axial direction of the cylinder, then in design, considering the influence of thickness and the like, CD — r.cos (180/n) > a/2, the maximum value of n can be determined according to this formula;
in order to fully utilize the distance in the vertical direction and increase the optical path, the light source and the detector adopted in the design can be directly pasted on the horizontal PCB. The influence of the verticality of the main optical path component 1 on the optical path is avoided;
the use of the reflective arc plate 21 at the light source reduces the divergence angle of the light source, and the reflective arc plate 21 may also serve as a steering function if the direction of the light emitted by the light source is not in the same direction as the optical cavity.
If the emitting light source is directly attached to the horizontal PCB, the emitting light beam propagates in the vertical direction, and in order to enable the light beam to propagate in the horizontal direction in the optical cavity, the reflecting arc plate 21 reduces the divergence angle and simultaneously converts the light beam from the vertical direction to the horizontal direction for propagation.
The height of the cylindrical optical cavity is 0.5mm-5mm, the area of the cylindrical optical cavity is as small as possible, and the small cavity is favorable for improving the gas exchange speed and accelerating the response time. The cylindrical upper wall and the cylindrical lower wall can restrain light beams, so that light energy loss is avoided;
the light beams converged by the reflecting arc plate 21 are received, so that the effective light energy after multiple scattering can be converged to the effective receiving surface of the detector as much as possible.
If the receiving detector is directly attached to the PCB, the reflecting arc plate 21 should perform the function of converging and turning in order to ensure that the light reflected for many times can be converged on the receiving detector.
The arrangement of the two reflecting arc plates 21 is beneficial to changing the position of light reflected in the first shell 11, one reflecting arc plate 21 plays a role in convergence, light scattered for many times in the cavity of the first shell 11 reaches the second reflecting arc plate, the second reflecting arc plate 21 converges and turns the light, and the focal point is transmitted to the effective receiving surface of the detector 73; the reflecting arc plate 21 has the functions of convergence and steering, and the effective utilization rate of the space volume is increased.
The setting of reflection cambered plate 21, do benefit to the position that changes the light reflection in first casing 11, the user is when adjusting reflection cambered plate 21, swivelling joint board 43, connecting plate 43 then drives reflection cambered plate 21 and rotates, after rotating a certain position, press connecting plate 43, make connecting plate 43 drive the universal ball and rotate in base 41, when pressing, body of rod two 52 then slides in body of rod one 51, make the height of connecting plate 43 receive the restriction, the user is when adjusting the rotational position of connecting plate 43, revolve wrong knob 541, knob 541 drives gear one 542 and rotates, gear one 542 drives ring body 53 and rotates, ring body one 53 drives spacing portion 531 and rotates, body of rod two 52 on spacing portion 531 also begins to do the circular motion this moment, spacing portion 531 is the hollow cylinder structure, be connected through the bearing between with body of rod two 52.
Example two
The function of the first adjusting ring body 53 is added to the first embodiment.
A through groove 14 is formed in the top of the second shell 12, a bottom plate 3 is arranged in the through groove 14, and the bottom plate 3 is connected with the reflecting arc plate 21 through an adjusting assembly 5 and a position adjusting assembly 4;
the bottom plate 3 is arranged in the through groove 14;
the position adjusting assembly 4 comprises a base 41, a universal ball 42 and a connecting plate 43, the base 41 is symmetrically arranged at the bottom of the bottom plate 3, the universal ball 42 is movably connected to the inner side wall of the base 41, the connecting plate 43 is arranged on the outer side wall of the universal ball 42, and the connecting plate 43 is connected with the reflecting arc plate 21;
the adjusting assembly 5 comprises a first rod body 51 and a second rod body 52, the first rod body 51 is arranged at the top of the connecting plate 43, and the first rod body 51 is connected to the bottom of the second rod body 52 in a sliding manner;
the inside of bottom plate 3 rotates the connection body of rod three 54, the lateral wall of body of rod three 54 is provided with gear one 542, gear one 542 with ring body one 53 meshing is connected, the top of body of rod three 54 is provided with knob 541.
Referring to fig. 1-10, the position adjusting assembly 4 and the adjusting assembly 5 are supported by the bottom plate 3, and the position adjusting assembly 4 is connected to the reflective arc plate 21, so that a user can control the position adjusting assembly 4 to change the angle of the reflective arc plate 21, and control the adjusting assembly 5 to rotate the reflective arc plate 21; when a user adjusts the reflecting arc plate 21, the connecting plate 43 is rotated, the connecting plate 43 drives the reflecting arc plate 21 to rotate, after the reflecting arc plate is rotated to a certain position, the connecting plate 43 is pressed, the connecting plate 43 drives the universal ball to rotate in the base 41, and the second rod body 52 slides in the first rod body 51 while pressing, so that the height of the connecting plate 43 is limited; the first ring body 53 rotates and simultaneously drives the limiting part 531 to rotate on the inner side of the second ring body 532; when a user adjusts the rotating position of the connecting plate 43, the knob 541 is screwed, the knob 541 drives the first gear 542 to rotate, the first gear 542 drives the first ring 53 to rotate, the first ring 53 drives the limiting portion 531 to rotate, at this time, the second rod 52 on the limiting portion 531 starts to perform circular motion, and the limiting portion 531 is of a hollow cylindrical structure and is connected with the second rod 52 through a bearing.
EXAMPLE III
The function of adjusting the height of the second rod body 52 is added on the basis of the second embodiment
The inside wall of bottom plate 3 rotates and connects ring body three 58, ring body three 58 is located the top of ring body 53, the lateral wall of the body of rod three 54 is provided with gear two 543, gear two 543 can with ring body three 58 meshes is connected, the top of the body of rod two 52 is provided with gear three 57, gear three 57 with ring body three 58 meshes is connected, the body of rod one 51 with body of rod two 52 threaded connection, the bottom of the body of rod three 54 is provided with the body of rod four 56, the body of rod four 56 with body of rod three 54 sliding connection, the body of rod four 56 with be provided with spring 59 between the body of rod three 54.
Referring to fig. 1-10, when the rod body three 54 rotates, the gear two 543 is driven to rotate, the gear two 543 drives the ring body three 58 to rotate, the ring body three 58 is meshed with the gear three 57, so as to drive the rod body two 52 to rotate, at this time, the rod body one 51 is raised or lowered, the user can press the rod body three 54 to lower the rod body three 54, so as to separate the gear two 543 and the ring body three 58, and the spring 59 is arranged to reset the rod body three 54 in the rod body four 56, so that the gear two 543 is butted with the ring body three 58.
Referring to fig. 10, the environmental sensor 72 is used for detecting environmental information such as humidity, temperature, pressure, etc. in the ambient air, and providing a basis for subsequent sensor signal compensation and correction; the arrangement of the dustproof film 9 protects the main light path assembly 1 and prevents dust from entering.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. An optical path device of an NDIR gas detection sensor, characterized in that: the LED lamp tube comprises a main light path component (1), a reflection component (2), a lower light path shell (8) and a circuit board (7), wherein the main light path component (1) and the lower light path shell (8) form a cylindrical light reflection chamber;
the lower light path shell (8) comprises a first through hole (81), a second through hole (82), a third through hole (83) and a lower light cavity reflecting surface (84), the first through hole (81) is located at the center of the lower light cavity reflecting surface (84), the third through hole (83) and the second through hole (82) are formed in the lower light cavity reflecting surface (84), a light source (71), an environment sensor (72) and a detector (73) are arranged on the circuit board (7), the environment sensor (72) corresponds to the first through hole (81), the second through hole (82) corresponds to the light source (71), and the third through hole (83) corresponds to the detector (73);
main light path subassembly (1) includes first casing (11), second casing (12) and air vent (13), the inside wall of first casing (11) is provided with second casing (12), one has at least been seted up at the top of second casing (12) air vent (13), there is inner wall (111) on first casing (11), inner wall (111) are the side plane of reflection of optics chamber, interior plane (121) have on second casing (12), interior plane (121) are the last plane of reflection of optics chamber, the bottom edge of second casing (12) is provided with reflection assembly (2).
2. An NDIR gas detection sensor optical path apparatus according to claim 1, wherein: reflection component (2) are including reflection arc board (21), diapire (22) and lateral wall (23), the bottom edge of second casing (12) is close to the inside wall of first casing (11) is provided with two reflection arc board (21), two be provided with between reflection arc board (21) diapire (22), keep away from one side of diapire (22) the inside wall of first casing (11) is connected lateral wall (23), the cross section and the vertical section curve of reflection arc board (21) can be straight line, circular arc, elliptical arc, parabola, free curve.
3. An NDIR gas detection sensor optical path apparatus according to claim 2, wherein: the top of the second shell (12) is provided with a through groove (14), a bottom plate (3) is arranged in the through groove (14), and the bottom plate (3) is connected with the reflecting arc plate (21) through an adjusting component (5) and a position adjusting component (4).
4. An NDIR gas detection sensor optical path means according to claim 3, wherein: the bottom plate (3) is arranged in the through groove (14);
the position adjusting assembly (4) comprises a base (41), universal balls (42) and a connecting plate (43), the base (41) is symmetrically arranged at the bottom of the bottom plate (3), the universal balls (42) are movably connected to the inner side wall of the base (41), the connecting plate (43) is arranged on the outer side wall of each universal ball (42), and the connecting plate (43) is connected with the reflecting arc plate (21);
the adjusting component (5) comprises a first rod body (51) and a second rod body (52), the first rod body (51) is arranged at the top of the connecting plate (43), and the bottom of the second rod body (52) is connected with the first rod body (51) in a sliding mode.
5. The optical circuit apparatus of claim 4, wherein: the inner side wall of the bottom plate (3) is rotatably connected with a first ring body (53), a second ring body (532) is arranged on the inner side of the first ring body (53), a limiting part (531) is arranged between the first ring body (53) and the second ring body (532), and the limiting part (531) is rotatably connected with the second rod body (52).
6. An NDIR gas detection sensor optical path means according to claim 5, wherein: the inside of bottom plate (3) is rotated and is connected body of rod three (54), the lateral wall of body of rod three (54) is provided with gear one (542), gear one (542) with ring body one (53) meshing is connected, the top of body of rod three (54) is provided with knob (541).
7. The NDIR gas detection sensor optical path device of claim 6, wherein: the inside wall of bottom plate (3) rotates and connects ring body three (58), ring body three (58) are located the top of ring body (53), the lateral wall of the body of rod three (54) is provided with gear two (543), gear two (543) can with ring body three (58) meshing is connected, the top of the body of rod two (52) is provided with gear three (57), gear three (57) with ring body three (58) meshing is connected, the body of rod one (51) with body of rod two (52) threaded connection.
8. An NDIR gas detection sensor optical path means according to claim 7, wherein: the bottom end of the rod body three (54) is provided with a rod body four (56), the rod body four (56) is in sliding connection with the rod body three (54), and a spring (59) is arranged between the rod body four (56) and the rod body three (54).
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