Light path coupling mechanism of gas analyzer
By adopting a new optical path coupling layout and adjusting the parabolic mirror, the problem of bulky structure in the optical path coupling system of the gas analyzer was solved, achieving a compact and well-sealed optical path coupling effect and improving optical coupling efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING BEIFEN RUILI ANALYTICAL INSTR GROUP
- Filing Date
- 2025-01-16
- Publication Date
- 2026-04-28
AI Technical Summary
Existing gas analyzer optical path coupling systems generally adopt a horizontal arrangement, resulting in an excessive distance between the interferometer and the gas cell, leading to a bulky overall structure.
A new layout is adopted, in which the gas pool incident sealing interface and the gas pool exit sealing interface are arranged horizontally. The optical path is compactly coupled by combining the exit off-axis parabolic mirror, the incident off-axis parabolic mirror and the adapter off-axis parabolic mirror. The optical path is focused by using the parabolic mirror slide rail and the guide rail knob. Combined with the sealing design, the optical coupling efficiency is improved.
This invention achieves a compact structure, small size, convenient debugging, and well-sealed optical path coupling for the gas analyzer, reducing interference from environmental factors and improving optical coupling efficiency.
Smart Images
Figure CN224176368U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an optical path coupling mechanism in a gas analyzer, which is a key component of the gas analyzer. Background Technology
[0002] A gas analyzer consists of an infrared interferometer, a gas cell, a gas path system, an optical coupling system, and a detector module. The infrared interferometer and gas cell are independent components of the instrument. Infrared interferometers from various companies are variations of the Michelson interferometer; although their shapes differ, their performance specifications are generally similar. The gas cells all utilize White cells with varying optical path lengths. The optical coupling system is the link between the interferometer and the gas cell; the quality of the optical coupling mechanism design directly affects the instrument's specifications and performance.
[0003] Existing optical path coupling systems generally adopt a horizontal arrangement, which greatly increases the distance between the interferometer and the gas cell, resulting in a bulky overall structure. Utility Model Content
[0004] This invention provides an optical path coupling mechanism for a gas analyzer, which adopts a new layout, making it compact, small in size, easy to debug, and with good sealing performance.
[0005] The technical solution adopted in this utility model is as follows:
[0006] An optical path coupling mechanism for a gas analyzer, characterized in that it includes a sealed cavity, the top surface of which is sealed with a top cover and the bottom surface with a base; one side of the sealed cavity is provided with an interferometer light inlet interface for sealed connection with the interferometer; the other side of the sealed cavity is provided with a gas cell inlet sealing interface and a gas cell outlet sealing interface, respectively for sealed connection with the gas cell; wherein:
[0007] The sealed cavity is equipped with an outgoing off-axis parabolic mirror, an incoming off-axis parabolic mirror, and a transition off-axis parabolic mirror;
[0008] The off-axis parabolic mirror can reflect and convert parallel light entering from the interferometer's light inlet into converging light, which then enters the gas cell through the gas cell's sealed inlet.
[0009] The incident off-axis parabolic mirror can convert the reflected light entering the sealed cavity from the gas pool exit sealed interface into parallel light.
[0010] The off-axis parabolic mirror can focus the parallel light reflected from the incident off-axis parabolic mirror onto a detector arranged inside a sealed cavity.
[0011] The optical path coupling mechanism of the gas analyzer, wherein the interferometer's light input interface is arranged in a horizontal longitudinal direction, and the gas cell's incident sealing interface and the gas cell's exit sealing interface are arranged in a horizontal transverse direction.
[0012] The exit off-axis parabolic mirror, the incident off-axis parabolic mirror, and the transition off-axis parabolic mirror are arranged at different heights.
[0013] The optical path coupling mechanism of the gas analyzer wherein the position of the outgoing off-axis parabolic mirror and the incident off-axis parabolic mirror are relatively fixed, and they can move horizontally relative to the sealed cavity via the parabolic mirror slide rail.
[0014] The optical path coupling mechanism of the gas analyzer, wherein the off-axis parabolic mirror can move vertically relative to the sealed cavity.
[0015] The optical path coupling mechanism of the gas analyzer includes a transition off-axis parabolic mirror fixed to a guide rail base. The guide rail base is connected to a fixed base via a vertical guide rail. The fixed base is fixed in a sealed cavity. A guide rail knob with a fixed position is provided on the guide rail base. The guide rail knob is connected to the fixed base via a thread.
[0016] The optical path coupling mechanism of the gas analyzer, wherein the detector is capable of adjusting its position relative to the sealed cavity in both the horizontal longitudinal and horizontal directions.
[0017] The optical path coupling mechanism of the gas analyzer includes a detector fixed to a detector bracket, the detector bracket mounted on a detector seat via a longitudinal slide rail, and the detector seat mounted on a sealed cavity via a transverse slide rail.
[0018] The optical path coupling mechanism of the gas analyzer, wherein the pitch of the guide rail knob is less than or equal to 0.25 mm.
[0019] The optical path coupling mechanism of the gas analyzer includes a barium fluoride exit window and a barium fluoride entrance window at the gas cell entrance sealing interface and the gas cell exit sealing interface, respectively.
[0020] The optical path coupling mechanism of the gas analyzer includes a calcium fluoride window installed at the light input interface of the interferometer.
[0021] This invention features a short optical path, a sealed design that ensures a stable microenvironment and minimal interference from environmental factors. Furthermore, it boasts a simple structure, compact size, convenient debugging, and high optical coupling efficiency. Attached Figure Description
[0022] Figure 1 This is a three-dimensional view of the optical path coupling cavity.
[0023] Figure 2 This is the overall front view of the optical path coupling cavity.
[0024] Figure 3 This is the left view of the optical path coupling cavity as a whole.
[0025] Figure 4 This is a right view of the internal optical path structure.
[0026] Figure 5 This is the main view of the internal optical path structure.
[0027] Figure 6 This is the left view of the internal optical path structure.
[0028] Figure 7 It is a 3D diagram of the internal optical path structure.
[0029] Explanation of reference numerals in the attached diagram: 1-Gas cell exit sealing interface; 2-Gas cell entrance sealing interface; 3-Interferometer light entrance interface; 4-Top cover; 5-Sealed cavity; 6-Base; 7-Barium fluoride exit window; 8-Barium fluoride entrance window; 9-Parabolic mirror bracket 2; 10-Incident off-axis parabolic mirror; 11-Adapter off-axis parabolic mirror; 12-Exit off-axis parabolic mirror; 13-Detector housing; 14-Detector; 15-Detector bracket; 16-Longitudinal slide rail; 17-Detector base; 18-Transverse slide rail; 19-Parabolic mirror bracket; 20-Parabolic mirror slide rail; 21-Knob; 22-Guide rail base; 23-Vertical guide rail; 24-Fixing base. Detailed Implementation
[0030] This invention provides an optical coupling mechanism for a gas analyzer, which can couple the interferometer, gas cell, and detector module into a whole. The optical coupling mechanism has a compact structure, small size, convenient debugging, and good sealing performance.
[0031] like Figures 1-3 The diagram shows a perspective view, a front view, and a left view of the optical path coupling mechanism of the gas analyzer of this invention. It mainly includes a sealed cavity 5, with its top surface sealed by a top cover 4 and its bottom surface sealed by a base 6. Its front side ( Figure 2 The side facing the reader has an interferometer light input interface 3 and is fitted with a calcium fluoride window (the sealing interface material is preferably Peek, a material with stable heat resistance), which can be used for sealed connection with the interferometer; the side of the sealing cavity 5 ( Figure 2 The left side of the chamber is provided with a gas pool inlet sealing interface 2 and a gas pool outlet sealing interface 1, which are used to seal and connect with the gas pool inlet window and the gas pool outlet window respectively. The gas pool inlet sealing interface 2 and the gas pool outlet sealing interface 1 are respectively provided with barium fluoride outlet window 7 and barium fluoride inlet window 8; a detector 14 is provided inside the sealing cavity 5.
[0032] When using (in conjunction with) Figure 2 , Figure 4As shown, the horizontal longitudinal parallel light from the interferometer enters the sealed cavity 5 through the interferometer light inlet 3. After being reflected 90° by the off-axis parabolic mirror 12, it is transformed into horizontally converging light. It then enters the gas cell through the gas cell inlet sealed interface 2. After multiple reflections in the gas cell, it enters the sealed cavity 5 again horizontally through the gas cell outlet sealed interface 1. After being reflected 90° upward by the off-axis parabolic mirror 10, it is transformed into vertical parallel light. After being reflected 90° by the transition off-axis parabolic mirror 11, it is transformed into horizontally converging light and converges at the detector 14.
[0033] This invention arranges the gas pool incident sealing interface 2 and the gas pool exit sealing interface 1 in an up-down layout, and arranges the exit off-axis parabolic mirror 12, the incident off-axis parabolic mirror 10, and the transition off-axis parabolic mirror 11 on the same vertical line, which can reduce the volume of the entire optical path coupling structure and make the structure compact.
[0034] For example Figure 4 , Figure 5 , Figure 6 , Figure 7 The images shown are the right view, front view, left view, and 3D view of the internal optical path structure, respectively. As can be seen:
[0035] The outgoing off-axis parabolic mirror 12 and the incoming off-axis parabolic mirror 10 are mounted on the parabolic mirror support 19. The parabolic mirror support 19 can move horizontally relative to the base 6 via the parabolic mirror slide rail 20 made of polytetrafluoroethylene material, so as to realize the optical focusing and connection of the interferometer and the gas cell in the horizontal direction.
[0036] The off-axis parabolic mirror 11 is fixed to the guide rail base 22 by a support plate. The guide rail base 22 is connected to the fixed base 24 by a vertical guide rail 23. The fixed base 24 is fixed to the base 6, so that the guide rail base 22 and the off-axis parabolic mirror 11 on it can move vertically relative to the base 6. A guide rail knob 21 with a fixed position is provided on the guide rail base 22. The guide rail knob 21 is connected to the fixed base 24 by a thread. By rotating the guide rail knob 21, the vertical position of the off-axis parabolic mirror 11 can be adjusted so as to achieve optical focusing of the off-axis parabolic mirror 11 and the detector 14 in the vertical direction.
[0037] The detector 14 is fixed to the detector housing 13, the detector housing 13 is fixed to the detector bracket 15, the detector bracket 15 is mounted to the detector base 17 via the longitudinal slide rail 16, and the detector base 17 is mounted to the base 6 via the transverse slide rail 18. By adjusting the horizontal position of the longitudinal slide rail 16 and the transverse slide rail 18, optical focusing of the off-axis parabolic mirror 11 and the detector 14 in the horizontal longitudinal and horizontal directions can be achieved.
[0038] The thread on the guide rail knob 21 is a precision thread with a pitch of 0.25mm, which can ensure the optical coupling accuracy of the sensitive element on the detector 14.
[0039] Among them, the barium fluoride exit window 7 and the barium fluoride entrance window 8 serve as sealing windows, taking into account both infrared transmittance (transmittance can reach 96%) and infrared band range (2.5um-20um).
[0040] In summary, this invention features a short optical path, a sealed design that ensures a stable microenvironment and minimal interference from environmental factors. Furthermore, it boasts a simple structure, compact size, convenient debugging, and high optical coupling efficiency.
Claims
1. An optical path coupling mechanism for a gas analyzer, characterized in that, The system includes a sealed cavity, with its top surface sealed by a top cover and its bottom surface sealed by a base. One side of the sealed cavity has an interferometer light inlet interface for sealed connection with the interferometer; the other side of the sealed cavity has a gas cell inlet sealing interface and a gas cell outlet sealing interface, respectively for sealed connection with the gas cell. Wherein: The sealed cavity is equipped with an outgoing off-axis parabolic mirror, an incoming off-axis parabolic mirror, and a transition off-axis parabolic mirror; The off-axis parabolic mirror can reflect and convert parallel light entering from the interferometer's light inlet into converging light, which then enters the gas cell through the gas cell's sealed inlet. The incident off-axis parabolic mirror can convert the reflected light entering the sealed cavity from the gas pool exit sealed interface into parallel light. The off-axis parabolic mirror can focus the parallel light reflected from the incident off-axis parabolic mirror onto a detector arranged inside a sealed cavity.
2. The optical path coupling mechanism of the gas analyzer according to claim 1, characterized in that, The interferometer's light input interface is arranged in a horizontal longitudinal direction, and the gas cell's incident sealing interface and gas cell's exit sealing interface are arranged in a horizontal transverse direction. The exit off-axis parabolic mirror, the incident off-axis parabolic mirror, and the transition off-axis parabolic mirror are arranged at different heights.
3. The optical path coupling mechanism of the gas analyzer according to claim 2, characterized in that, The exit off-axis parabolic mirror and the incident off-axis parabolic mirror are relatively fixed in position, and can move horizontally relative to the sealed cavity via the parabolic mirror slide rail.
4. The optical path coupling mechanism of the gas analyzer according to claim 1 or 3, characterized in that, The off-axis parabolic mirror can move vertically relative to the sealed cavity.
5. The optical path coupling mechanism of the gas analyzer according to claim 4, characterized in that, The off-axis parabolic mirror is fixed to the guide rail seat, which is connected to the fixed seat via a vertical guide rail. The fixed seat is fixed in the sealed cavity. A guide rail knob with a fixed position is provided on the guide rail seat, and the guide rail knob is connected to the fixed seat via a thread.
6. The optical path coupling mechanism of the gas analyzer according to claim 4, characterized in that, The detector can be adjusted in position relative to the sealed cavity in both the horizontal longitudinal direction and the horizontal transverse direction.
7. The optical path coupling mechanism of the gas analyzer according to claim 6, characterized in that, The detector is fixed to the detector bracket, the detector bracket is mounted on the detector base via a longitudinal slide rail, and the detector base is mounted on the sealed cavity via a transverse slide rail.
8. The optical path coupling mechanism of the gas analyzer according to claim 5, characterized in that, The pitch of the guide rail knob is less than or equal to 0.25 mm.
9. The optical path coupling mechanism of the gas analyzer according to claim 1, characterized in that, The gas pool injection sealing interface and the gas pool exit sealing interface are respectively provided with barium fluoride exit window and barium fluoride injection window.
10. The optical path coupling mechanism of the gas analyzer according to claim 1, characterized in that, Install a calcium fluoride window at the light input interface of the interferometer.