Adjustable detection light path based on Tdlas technology
By designing an adjustable detection optical path in Tdlas technology, the optical path shaping mechanism and adjustment structure are used to achieve high intensity convergence and accurate adjustment of the light beam, and the interference is eliminated by the introduction of protective gas, the problems of inaccurate optical path adjustment and environmental interference in the prior art are solved, and the accuracy and stability of gas detection are improved.
Patent Information
- Application Number
- CN202421143398.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-05-23
AI Technical Summary
In Tdlas technology, it is difficult for the prior art to achieve accurate adjustment of the detection light path, resulting in the light beam not being able to accurately pass through the gas sample, affecting the acquisition of gas absorption spectrum information, and it is difficult to eliminate the impact of environmental interference gases, reducing detection accuracy.
An adjustable detection optical path based on Tdlas technology is designed to form high-intensity parallel convergence light through the optical path shaping mechanism, and adjust the distance between the lens and the laser to achieve the adjustment of the beam energy density. At the same time, by setting air inlets on the shaping cover and mounting plate, protective gas is introduced to eliminate the influence of interfering gas.
It realizes high intensity convergence of the light beam and accurate adjustment of the optical path, improves the utilization rate of light and the accuracy of gas detection, expands the scope of application of the sample, and improves the stability of the optical path detection.
Smart Images
Figure CN222850508U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of gas detection, in particular to an adjustable detection optical path based on Tdlas technology. Background Art
[0002] Tdlas technology is widely used in life and medical fields. This technology uses semiconductor lasers as light sources to scan the gas molecules to be detected, and feeds back the gas concentration information of the measured gas by detecting and analyzing the transmitted light absorbed by the gas. During the detection process, if the stable optical path cannot be accurately adjusted, it cannot be ensured that the light beam can accurately pass through the gas sample, making it difficult to obtain better gas absorption spectrum information, affecting the test results. In addition, in order to eliminate the influence of interfering gases in the environment, the path of optical path detection needs to be protected to improve the accuracy of detection. Summary of the invention
[0003] In order to solve the above problems of the prior art, the utility model provides an adjustable detection optical path based on Tdlas technology, which can obtain high-intensity parallel convergent light through an optical path shaping mechanism to improve light utilization, while introducing protective gas to improve detection accuracy.
[0004] The technical solutions adopted are as follows:
[0005] An adjustable detection optical path based on Tdlas technology, comprising a laser emitting laser, a mounting plate and a shaping cover sealed and connected to the mounting plate, characterized in that: an optical path shaping mechanism capable of shaping light into converged parallel light is provided in the shaping cover, an opening for the optical path to pass through is also provided at one end of the shaping cover, the optical path shaping mechanism comprises a lens holder sealed and connected to the mounting plate, a first lens and a second lens provided in the lens holder, a first adjustment structure and a second adjustment structure capable of adjusting the distance between the lens and the laser are respectively provided between the lens holder and the first lens and the second lens, a first groove and a second groove for adjusting the first lens and the second lens are respectively provided on the lens holder, and a first air inlet and a second air inlet for introducing protective gas are respectively provided on the mounting plate and the shaping cover.
[0006] Furthermore, the first adjustment structure includes a first mounting block threadedly connected to the first lens, and a first adjustment ring arranged outside the first mounting block and threadedly connected to the first mounting block. The first adjustment ring is threadedly connected to the lens bracket, and the first adjustment ring is correspondingly arranged at the notch of the first groove.
[0007] Furthermore, the second adjustment structure includes a second mounting block threadedly connected to the second lens, and a second adjustment ring disposed outside the second mounting block and threadedly connected to the second mounting block. The second adjustment ring is threadedly connected to the lens bracket, and the second adjustment ring is correspondingly disposed at the second groove notch.
[0008] Furthermore, a pressure cover is provided on one end of the lens bracket away from the mounting plate.
[0009] Furthermore, a first sealing ring is provided between the shaping cover and the mounting plate; the laser and the lens bracket are partially embedded in the mounting plate, and a second sealing ring is provided between the lens bracket and the mounting plate.
[0010] Furthermore, the first and second mounting blocks are provided with protrusions, and the lens bracket is provided with a sliding groove for limiting the movement of the first and second mounting blocks and for allowing the protrusions to slide.
[0011] Furthermore, screw holes are provided on the outer walls of the first and second adjusting rings, and screws are provided in the screw holes, which can drive the first and second adjusting rings to rotate and enable the first and second mounting blocks to drive the lens to move on the optical path.
[0012] Furthermore, the combination of the first lens and the second lens may be a combination of a plano-concave lens and a first plano-convex lens, or a combination of a bi-concave lens and a bi-convex lens.
[0013] Furthermore, a detector is provided on the light path outside the shaping cover.
[0014] Furthermore, a second plano-convex lens may be provided between the second lens and the detector.
[0015] Compared with the prior art, the beneficial effects produced by the utility model are:
[0016] The utility model provides an adjustable detection optical path based on Tdlas technology, wherein a first lens and a second lens are provided at the front end of the laser emission, and the light emitted by the laser with a certain divergence angle is shaped into a high-intensity waist beam. When the detection sample is detected at the waist position, the light beam can pass through the bottled sample with a smaller diameter, which not only improves the utilization rate of the laser beam, but also greatly improves the applicable scope of the sample. The combination of the first lens and the second lens can be a combination of a plano-concave lens and a first plano-convex lens, or a combination of a double concave lens and a double convex lens. The two lenses are installed in a lens holder, and an adjustment structure is provided between the lens holder and the first lens and the second lens. The distance between the lens and the laser can be adjusted as needed, so as to change the size of the light spot to adjust the energy density of the laser beam, and realize the convenience of optical path debugging. The adjustment structure has a convenient locking function, and the optical path can be easily and conveniently locked after the optical path adjustment is completed, which greatly improves the stability of optical path detection.
[0017] In addition, the laser is installed on a mounting plate, and the mounting plate is sealed and connected to a plastic cover. An air inlet is provided on the plastic cover and the mounting plate respectively for introducing protective gas. The protective gas is introduced through two inlets, so that the lens gap and the light beam channel are filled with protective gas without the influence of interfering gas, thereby further improving the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0019] Figure 2 It is a partial structural schematic diagram of the utility model;
[0020] Figure 3 It is a cross-sectional view of the utility model;
[0021] Figure 4 This is the optical path structure diagram combination 1 of the utility model;
[0022] Figure 5 This is the optical path structure diagram combination 2 of the utility model;
[0023] Figure 6 This is the optical path structure diagram combination 3 of the utility model;
[0024] Figure 7 This is the optical path structure diagram combination 4 of the utility model;
[0025] Among them, laser 1, mounting plate 2, shaping cover 3, optical path shaping mechanism 4, lens bracket 401, first lens 402, second lens 403, first adjustment structure 5, first mounting block 501, first adjustment ring 502, second adjustment structure 6, second mounting block 601, second adjustment ring 602, first groove 7, second groove 8, first air inlet 9, second air inlet 10, pressure cover 11, first sealing ring 12, second sealing ring 13, protrusion 14, slide groove 15, screw hole 16, second plano-convex lens 17, detector 18, opening 19. DETAILED DESCRIPTION
[0026] The present invention is further described below in conjunction with specific embodiments.
[0027] refer to Figure 1-7, an adjustable detection optical path based on Tdlas technology, comprising a laser 1 for emitting laser, a mounting plate 2 and a shaping cover 3 sealed and connected to the mounting plate 2, wherein the shaping cover 3 is provided with an optical path shaping mechanism 4 capable of shaping light into converged parallel light, and an opening 19 for the optical path to pass through is also provided at one end of the shaping cover 3, the optical path shaping mechanism 4 comprises a lens holder 401 sealed and connected to the mounting plate 2, a first lens 402 and a second lens 403 arranged in the lens holder 401, a first adjustment structure 5 and a second adjustment structure 6 for adjusting the distance between the lens and the laser are respectively provided between the lens holder 401 and the first lens 402 and the second lens 403, the lens holder 401 is provided with a first groove 7 and a second groove 8 for adjusting the first lens and the second lens, and the mounting plate 2 and the shaping cover 3 are provided with a first air inlet 9 and a second air inlet 10 for passing protective gas, respectively.
[0028] The first adjustment structure 5 includes a first mounting block 501 threadedly connected to the first lens, and a first adjustment ring 502 arranged outside the first mounting block 501 and threadedly connected to the first mounting block. The first adjustment ring 502 is threadedly connected to the lens bracket 401, and the first adjustment ring 502 is correspondingly arranged at the notch of the first groove 7.
[0029] The second adjustment structure 6 includes a second mounting block 601 threadedly connected to the second lens, and a second adjustment ring 602 arranged outside the second mounting block 601 and threadedly connected to the second mounting block. The second adjustment ring 602 is threadedly connected to the lens bracket 401, and the second adjustment ring 602 is correspondingly arranged at the notch of the second groove 8.
[0030] The outer walls of the first and second adjustment rings are both provided with screw holes 16, and the screw holes 16 are provided with screws that can drive the first and second adjustment rings to rotate and enable the first and second mounting blocks to drive the lenses to move on the optical path. The screws are installed on the screw holes 16, and when the screws are not locked, they can move in the first and second grooves. Since the screws are installed on the adjustment rings, when the screws slide in the grooves, the first and second adjustment rings will be driven to rotate. Both adjustment rings are provided with screws, which can be adjusted separately.
[0031] refer to Figure 3 ,by Figure 3 As a reference, when the first and second adjusting rings rotate, the first and second mounting blocks threadedly connected to the first and second adjusting rings will slide left and right, and drive the first lens 402 and the second lens 403 to move left and right, the first and second mounting blocks are provided with protrusions 14, and the lens bracket 401 is provided with a slide groove 15 for limiting the movement of the first and second mounting blocks and for the protrusion to slide. The slide groove 15 limits the sliding range of the protrusion 14, that is, limits the movement range of the first and second mounting blocks.
[0032] After adjusting the first lens 402 and the second lens 403 to a suitable position, tighten the screws and fill the first and second grooves with UV glue to fix the positions of the lenses.
[0033] A pressure cover 11 is provided on one end of the lens bracket 401 away from the mounting plate.
[0034] A first sealing ring 12 is provided between the shaping cover 3 and the mounting plate 2. The laser 1 and the lens holder 401 are partially embedded in the mounting plate 2, and a second sealing ring 13 is provided between the lens holder 401 and the mounting plate 2. The sealing ring is provided to improve the sealing of the inner cavity of the shaping cover. Good sealing can ensure that after the protective gas is introduced, the gas in the cavity can be completely discharged as much as possible, so that the cavity is filled with protective gas without doping.
[0035] The first air inlet 9 is arranged at the upper end of the mounting plate 2, and the second air inlet 10 is arranged on the outer wall of the shaping cover 3. The protective gas is introduced into the first and second air inlets, and the protective gas enters the lens holder 401 through the first air inlet 9, and the interfering gas in the gap between the first lens 402 and the second lens 403 is discharged into the shaping cover 3. The protective gas enters the shaping cover 3 through the second air inlet 10, and is then discharged through the opening 19 on the shaping cover. In this way, almost all the interfering gas in the shaping cover 3 can be discharged, and background protection is achieved, thereby greatly improving the accuracy of gas concentration detection.
[0036] A detector 18 is also provided on the optical path outside the shaping mask. A second plano-convex lens 17 may be provided between the second lens 403 and the detector 18. The combination of the first lens and the second lens may be a combination of a plano-concave lens and a first plano-convex lens, or a combination of a bi-concave lens and a bi-convex lens. The second plano-convex lens 17 may or may not be provided. Figure 4 , 5 , 6, 7, there are four different lens combinations as embodiments. The first lens and the second lens shape the light with a certain divergence angle emitted by the laser into a high-intensity waist beam, and when testing the sample at the waist position, the light beam can pass through the bottled sample with a smaller diameter, which not only improves the utilization rate of the laser beam, but also greatly increases the applicable range of the sample.
[0037] The laser 1 emits laser light. When installed, the laser 1 is coaxial with the double concave lens and the first plano-convex lens. The light takes the first lens 402 as the incident surface, changes the beam waist through the first lens 402, and shapes and converges the light beam through the second lens 403, so that collimated and converged parallel light can be obtained at the opening 19, thereby greatly improving the quality of the light beam and the utilization rate of the light beam energy. The highly converged parallel light is converged to the detector 18 through the second plano-convex lens 17 for detection, and the detection result is more accurate.
[0038] Two streams of inert gas are introduced from the first and second air inlets to purge and protect the gaps between devices and the light beam channels respectively, thereby ensuring that there is no influence of environmental interfering gases in the path of the light beam, ultimately achieving high quality and accuracy of gas concentration detection as a whole.
[0039] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. An adjustable detection optical path based on Tdlas technology, comprising a laser (1) for emitting laser light, a mounting plate (2) and a shaping cover (3) sealed to the mounting plate, characterized in that: The shaping cover (3) is provided with a light path shaping mechanism (4) capable of shaping light into convergent parallel light. An opening (19) is also provided at one end of the shaping cover (3) for the light path to pass through. The light path shaping mechanism (4) comprises a lens holder (401) sealedly connected to the mounting plate (2), a first lens (402) and a second lens (403) provided in the lens holder (401). A first adjustment structure (5) and a second adjustment structure (6) for adjusting the distance between the lens and the laser are provided between the lens holder (401) and the first lens (402) and the second lens (403), respectively. A first groove (7) and a second groove (8) for adjusting the first lens and the second lens are provided on the lens holder (401), respectively. A first air inlet (9) and a second air inlet (10) for introducing protective gas are provided on the mounting plate (2) and the shaping cover (3), respectively.
2. The adjustable detection optical path based on Tdlas technology as claimed in claim 1, characterized in that: The first adjustment structure (5) comprises a first mounting block (501) threadedly connected to the first lens, and a first adjustment ring (502) arranged outside the first mounting block (501) and threadedly connected to the first mounting block, the first adjustment ring (502) being threadedly connected to the lens bracket (401), and the first adjustment ring (502) being arranged correspondingly at the notch of the first groove (7).
3. The adjustable detection optical path based on Tdlas technology as claimed in claim 1, characterized in that: The second adjustment structure (6) comprises a second mounting block (601) threadedly connected to the second lens, and a second adjustment ring (602) arranged outside the second mounting block (601) and threadedly connected to the second mounting block, the second adjustment ring (602) being threadedly connected to the lens bracket (401), and the second adjustment ring (602) being arranged correspondingly at the notch of the second groove (8).
4. The adjustable detection optical path based on Tdlas technology as claimed in claim 1, characterized in that: A pressure cover (11) is provided on the end of the lens bracket (401) away from the mounting plate.
5. The adjustable detection optical path based on Tdlas technology as claimed in claim 1, characterized in that: A first sealing ring (12) is provided between the shaping cover (3) and the mounting plate (2); the laser (1) and the lens holder (401) are partially embedded in the mounting plate (2), and a second sealing ring (13) is provided between the lens holder (401) and the mounting plate (2).
6. The adjustable detection optical path based on Tdlas technology as claimed in claim 2 or 3, characterized in that: The first and second mounting blocks are provided with protrusions (14), and the lens bracket (401) is provided with a sliding groove (15) for limiting the movement of the first and second mounting blocks and for allowing the protrusions to slide.
7. The adjustable detection optical path based on Tdlas technology as claimed in claim 2 or 3, characterized in that: The outer walls of the first and second adjustment rings are provided with screw holes (16), and the screw holes (16) are provided with screws capable of driving the first and second adjustment rings to rotate, so that the first and second mounting blocks drive the lens to move on the optical path.
8. The adjustable detection optical path based on Tdlas technology as claimed in claim 1, characterized in that: The combination of the first lens and the second lens may be a combination of a plano-concave lens and a first plano-convex lens, or a combination of a bi-concave lens and a bi-convex lens.
9. The adjustable detection optical path based on Tdlas technology as claimed in claim 1, characterized in that: A detector (18) is also provided on the optical path outside the shaping cover (3).
10. The adjustable detection optical path based on Tdlas technology as claimed in claim 9, characterized in that: A second plano-convex lens (17) may be provided between the second lens (403) and the detector (18).