High-temperature heating absorption cell
By using a split-type high-temperature heating absorption cell, employing 316 stainless steel and a White cell-designed optical reflector assembly, combined with a PTFE thermal insulation structure, the problem of optical path stability after heating is solved, achieving a low-cost, high-stability, and easy-to-maintain high-temperature heating absorption cell.
Patent Information
- Application Number
- CN202522553371.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-02
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-12-02
AI Technical Summary
Existing high-temperature heating absorption cells suffer from structural thermal deformation after heating, which affects the stability of the optical path, leading to a decrease in measurement accuracy and stability. Furthermore, they are prone to damage due to high processing costs and low yield.
It adopts a separate design of support, central absorption cell and optical reflector assembly. The central absorption cell is made of 316 stainless steel, the optical reflector assembly adopts White cell design, combined with PTFE heat insulation structure, and the lens is made of dielectric film coated fused quartz. The lens and absorption cell are arranged separately, and long optical path absorption is achieved by machining.
A high-temperature heating absorption cell with high stability and high yield has been developed, avoiding the impact of heating on the optical path, reducing processing costs, making the lens easy to replace and clean, and improving the stability and accuracy of the measurement.
Smart Images
Figure CN223756602U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to optical testing technical field, concretely relates to high temperature type heating absorption cell. BACKGROUND
[0002] With the development of laser technology, laser absorption spectrum technology (TDLAS) is used for gas detection application more and more widely. Narrow line width laser (line width < 0.01 nm) of different wavelengths is adopted, and isolated absorption line of target gas is accurately matched, and in theory, most of the gases existing in nature can be detected. And, through the application of long optical path absorption cell (more than 5m), the detection precision of TDLAS technology can reach ppb level.
[0003] Because some gases may appear condensation or adsorption phenomenon at normal temperature, it can cause the measurement value deviation, so in the detection process, the absorption cell needs to be heated. But for the absorption cell of long optical path, the thermal deformation of the structure after heating can cause the light path to have large deviation, and seriously affect the measurement stability and precision.
[0004] For high temperature type heating absorption cell, in order to avoid the influence of thermal deformation on light path after heating, low expansion coefficient materials such as fused quartz are usually used as optical structure skeleton, and there are problems such as high cost, low yield, difficult debugging, easy damage by vibration impact and the like.
[0005] Therefore, a new structure design idea is needed, which can realize the construction of high temperature type heating absorption cell by using conventional machining mode, and solve a series of problems caused by the existing absorption cell structure. UTILITY MODEL CONTENTS
[0006] The utility model wants to solve the technical problem of overcoming the shortage of prior art, and provides high temperature type heating absorption cell.
[0007] The utility model is realized through the following technical schemes: high temperature type heating absorption cell includes support part, central absorption cell and optical reflection mirror piece assembly;
[0008] The central absorption cell and the optical reflection mirror piece assembly are arranged as independent structures on the same support part;
[0009] The central absorption cell is provided with heat insulation structure;
[0010] The optical reflection mirror piece assembly adopts white cell design to realize long optical path absorption.
[0011] The central absorption cell is provided with window for laser passing at opposite ends, and the window is assembled with fused quartz mirror coated with dielectric film, which has good temperature resistance.
[0012] The central absorption pool is made of 316 stainless steel.
[0013] The central absorption pool is provided with an air inlet hole and an air outlet hole.
[0014] The central absorption pool is provided with a heating through hole for connecting a heating device.
[0015] The heat insulation structure is made of a polytetrafluoroethylene structure, and the heat insulation structure is wrapped around the shell of the central absorption pool.
[0016] The support part includes a bottom plate, and the central absorption pool and the optical reflection lens assembly are arranged on the bottom plate as independent structures.
[0017] The optical reflection lens assembly includes a main lens and a secondary lens, and the main lens and the secondary lens are arranged at two ends of the central absorption pool, and the main lens and the secondary lens are respectively arranged corresponding to the windows at two ends of the central absorption pool.
[0018] The main lens is a concave mirror, and the main lens is provided with a hole position for laser incidence and emission;
[0019] The secondary lens is provided with two pieces, and the secondary lens is a concave mirror.
[0020] The support part is also provided with a collimator and a detector, and the collimator and the detector are located on the side of the main lens away from the window;
[0021] The light emitting direction of the collimator is aligned with the hole position of the main lens;
[0022] The light receiving surface of the detector is aligned with the hole position of the main lens.
[0023] Compared with the prior art, the beneficial effects of the utility model are:
[0024] The application adopts the way of installing the absorption pool and the optical lens separately, and adopts good heat insulation means, which avoids the influence of heating on the stability of long-distance return light path, and only uses simple machining method to realize high-stability high-temperature heating absorption pool.
[0025] The optical reflection lens assembly of the application is arranged outside the central absorption pool, and the actual light path can be debugged after the central absorption pool is heated, so that the complex process of repeatedly switching between normal temperature and high temperature in the debugging process is avoided.
[0026] The application can realize the processing of high-temperature heating absorption pool by using machining method, and the process is simple, the cost is low, and the yield is high.
[0027] The central absorption pool as the main structure adopts stainless steel material, and has good anti-vibration and impact performance.
[0028] The lens of the optical reflection lens assembly is arranged outside the central absorption cell, can be directly cleaned and wiped, the detection gas is only passed into the central absorption cell, and if the lens is polluted and affects measurement, the lens can be directly replaced and cleaned. BRIEF DESCRIPTION OF DRAWINGS
[0029] Figure 1 is the structure of the present application Figure 1 ;
[0030] Figure 2 is the structure of the present application Figure 2 ;
[0031] Figure 3 is a schematic view of the position relationship between the central absorption cell and the heat insulation structure.
[0032] In the figure: 1, bottom plate; 2, central absorption cell; 201, window; 202, gas inlet hole; 203, gas outlet hole; 204, heating through hole; 3, heat insulation structure; 4, main lens; 5, auxiliary lens; 6, collimator; 7, detector. DETAILED DESCRIPTION
[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0034] Referring to Figures 1-3 , the high-temperature type heating absorption cell comprises a support part, a central absorption cell 2 and an optical reflection lens assembly.
[0035] The central absorption cell 2 and the optical reflection lens assembly are arranged on the same support part as independent structures;
[0036] The central absorption cell 2 is provided with a heat insulation structure 3.
[0037] The optical reflection lens assembly adopts a White cell design to realize long optical path absorption.
[0038] Opposite ends of the central absorption cell 2 are each provided with a window 201 for laser passing, the window 201 is assembled with a high-transmittance fused quartz lens coated with a dielectric film, and the window 201 has good temperature resistance characteristics.
[0039] The central absorption cell 2 is made of 316 stainless steel.
[0040] The central absorption cell 2 is provided with a gas inlet hole 202 and a gas outlet hole 203. Referring to Figure 3The air inlet hole 202 and the air outlet hole 203 are arranged at the top of the central absorption pool 2, and the specifications of the air inlet hole 202 and the air outlet hole 203 are M10 threaded holes.
[0041] The central absorption pool 2 is provided with a heating through hole 204 for connecting a heating device. Figures 1-3 The heating through hole 204 is provided with four heating through holes, which are arranged on the side of the central absorption pool 2. The heating device can adopt existing equipment such as a high-power metal heating rod. The heating through hole 204 is used as a mounting hole to install and fix the corresponding heating rod. The inner cavity of the central absorption pool 2 is heated by the heating rod. The central absorption pool 2 can be heated to above 180℃ in a short time by the heating rod.
[0042] The heating temperature of the central absorption pool in the embodiment can reach 200℃, and the time for heating from room temperature to the target temperature is less than or equal to 10 minutes.
[0043] The heat insulation structure 3 adopts a polytetrafluoroethylene structure, and the heat insulation structure 3 is wrapped around the shell of the central absorption pool 2. Specifically, the heat insulation structure 3 is fixedly connected to the shell of the central absorption pool 2 by M4 screws to block the heat transfer of the central absorption pool 2 to the mirror frames at both ends.
[0044] The support part includes a bottom plate 1, and the central absorption pool 2 and the optical reflection lens assembly are arranged on the bottom plate 1 as independent structures.
[0045] The optical reflection lens assembly includes a main lens 4 and a sub lens 5, which are arranged at both ends of the central absorption pool 2, and the main lens 4 and the sub lens 5 are respectively arranged corresponding to the windows 201 at both ends of the central absorption pool 2.
[0046] The main lens 4 is a concave mirror, and the main lens 4 is provided with a hole position for laser incidence and emission.
[0047] The sub lens 5 is provided with two concave mirrors.
[0048] Specifically, the main lens 4 is a large concave mirror in the White pool design, and the sub lens 5 is two small concave mirrors in the White pool design.
[0049] The support part is also provided with a collimator 6 and a detector 7, and the collimator 6 and the detector 7 are located on the side of the main lens 4 away from the window 201.
[0050] The light emitting direction of the collimator 6 is aligned with the hole position of the main lens 4.
[0051] The light receiving surface of the detector 7 is aligned with the hole position of the main lens 4.
[0052] In use, the collimator 6 is fixed on the base plate 1 by the collimator support, and the light emitting direction of the collimator is accurately aligned with the entrance hole of the main lens 4. The detector 7 is fixed on the base plate 1 by the detector support, and the light receiving surface of the detector 7 is aligned with the exit hole of the main lens 4, for receiving the laser light reflected by the optical mirror lens assembly and passing through the central absorption cell 2.
[0053] After the laser light is incident on the collimator 6, the laser light passes through the entrance hole of the main lens 4 (i.e. a large concave mirror), the window 201 of the central absorption cell 2, and is reflected multiple times between the main lens 4 and the two auxiliary lenses 5 (i.e. small concave mirrors), and passes through the window 201 at both ends of the central absorption cell 2, so that long distance transmission is achieved in the central absorption cell 2, thereby forming a long optical path absorption cell.
[0054] The detector 7 is adapted to the wavelength range of the laser light, and can convert the received laser signal into an electrical signal for gas concentration detection and analysis.
[0055] The central absorption cell 2 has an absorption optical path of ≥5m, and the time for increasing the temperature from room temperature to 200℃ is ≤10min. When the temperature in the central absorption cell 2 is 180℃, the temperature rise of the lenses of the optical mirror lens assembly is ≤5℃.
[0056] The central absorption cell supports replacement of the same model, and after replacement, there is no need to recalibrate, and the continuous working ability is strong. The lenses of the optical mirror lens assembly can also be directly cleaned and wiped or replaced separately.
[0057] The optical mirror lens and the central absorption cell are arranged as independent structural members on the same base plate, the outer part of the central absorption cell is provided with a relatively thick polytetrafluoroethylene structural member to achieve heat insulation and heat preservation, and only the central absorption cell is heated during heating, and the deformation of the mirror frames at both ends will not occur, so that the influence on the entire return light path will not occur, and the influence on the measurement stability and precision will not occur.
[0058] The above is only an optional embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation or direct / indirect application in other related technical fields according to the content of the utility model specification is included in the patent protection range of the utility model.
Claims
1. A high temperature heating absorption cell characterized by, The support part, the central absorption pool (2) and the optical reflection lens assembly are arranged on the same support part as independent structures. The central absorption pool (2) and the optical reflection lens assembly are arranged on the same support part as independent structures. The central absorption pool (2) is provided with a heat insulation structure (3). The optical reflection lens assembly adopts a White cell design to realize long optical path absorption.
2. The high-temperature heating absorption cell of claim 1, wherein, The central absorption pool (2) is provided with a window (201) for laser passing at each of the opposite ends.
3. The high-temperature heating absorption cell of claim 1, wherein, The window (201) is assembled with a fused quartz lens coated with a dielectric film.
4. The high-temperature heating absorption cell of claim 1, wherein, The central absorption pool (2) is made of 316 stainless steel.
5. The high-temperature heating absorption cell of claim 1, wherein, The central absorption pool (2) is provided with an air inlet hole (202) and an air outlet hole (203).
6. The high-temperature heating absorption cell of claim 1, wherein, The central absorption pool (2) is provided with a heating through hole (204) for connecting a heating device.
7. The high-temperature heating absorption cell of claim 1, wherein, The heat insulation structure (3) is made of a polytetrafluoroethylene structure and wraps the shell of the central absorption pool (2).
8. The high temperature heating absorption cell of claim 2, wherein, The support part includes a bottom plate (1), and the central absorption pool (2) and the optical reflection lens assembly are arranged on the bottom plate (1) as independent structures.
9. The high-temperature heating absorption cell of claim 8, wherein, The optical reflection lens assembly includes a main lens (4) and a sub lens (5), and the main lens (4) and the sub lens (5) are arranged at the two ends of the central absorption pool (2), respectively. The main lens (4) is a concave mirror, and the main lens (4) is provided with a hole for laser incidence and emission.
10. The high-temperature heating absorption cell of claim 9, wherein, The sub lens (5) is a concave mirror. The support part is further provided with a collimator (6) and a detector (7), and the collimator (6) and the detector (7) are located on the side of the main lens (4) away from the window (201). The light emitting direction of the collimator (6) is aligned with the hole of the main lens (4). The light receiving surface of the detector (7) is aligned with the hole of the main lens (4).