CN106483071B - Gas detector and absorption tank thereof - Google Patents
Gas detector and absorption tank thereof Download PDFInfo
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- CN106483071B CN106483071B CN201611261215.4A CN201611261215A CN106483071B CN 106483071 B CN106483071 B CN 106483071B CN 201611261215 A CN201611261215 A CN 201611261215A CN 106483071 B CN106483071 B CN 106483071B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/0303—Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention relates to a gas detector and an absorption tank thereof, which absorb Chi Weiping-concave optical resonant cavities, wherein light paths of the gas detector are respectively formed on a plane reflector and a concave reflector, a near-end reflecting point and a far-end reflecting point are circumferentially distributed around an optical axis of the resonant cavity, an incident light incident structure and an emergent light emergent structure of incident light are arranged on the plane reflector, and the positions of the incident light structure and the emergent light structure can be arranged on one coincident reflecting point with different reflecting sequences but coincident positions, or can be two points which are mutually close to each other in the near-end reflecting point. By this arrangement, the distance between the light incident structure of the incident light and the light emergent structure of the emergent light can be made as small as possible. The absorption tank is used, so that the size of the gas detector in the radial direction can be smaller, the space is saved, the structure is miniaturized, and the gas detector is convenient to carry; and the optical path of the light can be longer in the optical resonant cavity with smaller volume, thereby facilitating the subsequent gas detection work.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a gas detector and an absorption tank thereof.
Background
The conventional gas concentration detection device, such as the "portable polluted gas concentration detection device" in the chinese patent publication No. CN 205593914U, includes an absorption tank, a light emitter and a light receiver disposed on the same side of the absorption tank, and a detection device connected to the light receiver, where the absorption tank includes an absorption tank cavity for the gas to be detected to enter, a near light source end mirror and a far light source end mirror distributed left and right are disposed in the absorption tank cavity, the near light source end mirror and the far light source end mirror actually form an optical resonant cavity, the optical axis of the optical resonant cavity is a horizontal axis extending left and right, and the optical resonant cavity in the specific prior art is a concave-concave optical resonant cavity, that is, the near light source end mirror is two concave mirrors, and of course, in other prior art, the far light source end mirror may also be set as a concave mirror.
When the absorption cell formed by the concave-concave optical resonant cavity in the prior art is used, light beams emitted by a light source directly enter the absorption cell from an inlet at the radial outer side of a near light source end reflector, the light beams are firstly projected to a far light source end reflector, then are reflected by the far light source end reflector, the near light source end reflector and the far light source end reflector … … in sequence to generate optical resonance, and the distance of light rays can be prolonged in the optical resonant cavity with smaller volume through the optical resonance, so that the follow-up gas detection work is facilitated.
However, since the light incident structure (light incident port) and the light emergent structure (light emergent port) of the incident light in the prior art are distributed on two opposite sides of the near-light source end reflector in the radial direction, the distance between the light incident structure (light incident port) and the light emergent structure (light emergent port) of the incident light is too large, and the distance between the light emitter and the light receiver is too large, so that the size of the gas detection device in the radial direction is too large, the detection device structure has the problems of large volume, heavy weight, complex structure, incapability of being used in extreme environments (high-temperature vibration), difficulty in carrying and the like.
Disclosure of Invention
The invention aims to provide an absorption cell of a gas detector, which can reduce the interval between an incident light structure and an emergent light structure of incident light, and simultaneously provide the gas detector using the absorption cell, and can realize in-situ measurement in high-temperature flue gas.
In order to achieve the above purpose, the invention adopts the following technical scheme: the absorption cell of the gas detector comprises an absorption cell cavity, a near light source end reflector and a far light source end reflector which are arranged left and right in the absorption cell cavity, an incident light incident structure and an emergent light emergent structure, wherein the near light source end reflector and the far light source end reflector in the absorption cell cavity form an optical resonant cavity with a horizontal axis of which the optical axis extends left and right, and the optical paths of the optical resonant cavity form a near reflecting point and a far reflecting point on the near light source end reflector and the far light source end reflector respectively; the low beam source end reflector and the high beam source end reflector are respectively a plane reflector and a concave reflector, the plane reflector and the concave reflector form a plane-concave optical resonant cavity, the near end reflecting points and the far end reflecting points are all circumferentially distributed around the optical axis, the light inlet structure and the light outlet structure are arranged on the plane reflector, and the positions of the light inlet structure and the light outlet structure are positioned on one coincident point which is different in reflection sequence and coincides in the near end reflecting points or on two points which are close to each other in the near end reflecting points.
The outside of the absorption cell cavity is provided with a dustproof ventilation sintering metal mesh cover for wrapping the absorption cell cavity.
The plane reflecting mirror is fixed with the concave reflecting mirror through the superalloy supporting rod.
The technical scheme of the gas detection detector comprises an absorption tank, a light emitter and a light receiver, wherein the light emitter and the light receiver are arranged on the left side of the absorption tank, the absorption tank comprises an absorption tank cavity, a near light source end reflector and a far light source end reflector which are arranged on the left side and the right side in the absorption tank cavity, the absorption tank also comprises a light inlet structure of incident light and a light outlet structure of emergent light, the near light source end reflector and the far light source end reflector in the absorption tank cavity form an optical resonant cavity with a horizontal axis of which the optical axis extends left and right, and the light paths of the optical resonant cavity form a near reflecting point and a far reflecting point on the near light source end reflector and the far light source end reflector respectively; the low beam source end reflector and the high beam source end reflector are respectively a plane reflector and a concave reflector, the plane reflector and the concave reflector form a plane-concave optical resonant cavity, the near end reflecting points and the far end reflecting points are all circumferentially distributed around the optical axis, the light inlet structure and the light outlet structure are arranged on the plane reflector, and the positions of the light inlet structure and the light outlet structure are positioned on one coincident point which is different in reflection sequence and coincides in the near end reflecting points or on two points which are close to each other in the near end reflecting points.
The gas detector is provided with a light path cavity for light to pass through on the left side of the absorption tank, and the light emitter and the light receiver are arranged at the left end of the light path cavity.
The outside of the absorption cell cavity is provided with a dustproof ventilation sintering metal mesh cover for wrapping the absorption cell cavity.
The plane reflecting mirror is fixed with the concave reflecting mirror through the superalloy supporting rod.
The device also comprises a turning lens for changing the direction of the light beam, so that the light beam gathers towards the direction of the optical axis; the deflection lens is arranged at the left end of the absorption tank, or is arranged at the right end of the light path cavity, or is arranged between the absorption tank cavity and the light path cavity in a separated mode, so that the absorption tank cavity and the light path cavity are sealed and blocked while the light containing line passes through.
The turning lens is a turning prism.
The absorption cell is a plane-concave optical resonant cavity, light paths of the absorption cell are respectively formed on a plane reflector and a concave reflector, a near-end reflecting point and a far-end reflecting point are circumferentially distributed around an optical axis of the plane-concave optical resonant cavity, an incident light incident structure and an emergent light emergent structure of incident light are arranged on the plane reflector, specifically, the positions of the incident light structure and the emergent light structure can be in two forms, the first form is arranged on one coincident reflecting point with different reflecting sequences but coincident positions, and the other form is arranged by selecting two near-end reflecting points. By this arrangement, the distance between the light incident structure of the incident light and the light emergent structure of the emergent light can be made as small as possible. Therefore, the absorption cell with the flat-concave optical resonant cavity is used, on one hand, the size of the gas detector in the radial direction is smaller, occupied space is saved, the miniaturization of the structure is realized, and the gas detector is convenient to carry. On the other hand, optical resonance can be generated, so that the path of light rays can be longer in the optical resonant cavity with smaller volume, and the subsequent gas detection work is facilitated.
Furthermore, the deflection prism arranged on the gas detector can be used for changing the direction of the light beam, so that the light beam is gathered towards the optical axis, the distance between the light emitter and the light receiver which are arranged at a long distance is as small as possible, and the space in the radial direction is saved. Meanwhile, the refraction prism seals and blocks the cavity of the absorption cell and the cavity of the light path when the light-containing line passes through, so that when the absorption cell is in a high-temperature environment, the absorption cell at high temperature is separated from the light emitting and light receiving part, the light emitting and light receiving part cannot be affected by temperature, and the accuracy of measurement data is ensured.
Drawings
FIG. 1 is a block diagram of a gas detector of the present invention;
FIG. 2 is a schematic view of the optical path of the gas detector of the present invention;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is a side view of a schematic of the optical path of the turning prism;
fig. 5 is a top view of a schematic view of the optical path of the turning prism.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Gas detector embodiments
Fig. 1 is a schematic diagram of a basic structure of a gas detector of the present invention, which includes an absorption tank, a light emitter 7 and a light receiver 8 disposed on the gas detector and on the left side of the absorption tank, and a light path cavity for light to pass through, wherein the light path cavity is externally wrapped with a thin-wall support steel pipe 9.
The gas detector in this embodiment further comprises a turning prism 5 arranged at the right end of the optical path cavity through which the light passes.
The absorption cell of the gas detector in this embodiment includes an absorption cell cavity, a near light source end reflector, a far light source end reflector, an incident light incident structure (light incident port), and an emergent light emergent structure (light emergent port) disposed in the absorption cell cavity, wherein the near light source end reflector and the far light source end reflector in the absorption cell cavity form an optical resonant cavity with an optical axis extending left and right. The low beam source end reflector and the high beam source end reflector are respectively a plane reflector 1 and a concave reflector 2, and the two reflectors are fixed together through a high-temperature alloy supporting rod 3 and form a flat-concave optical resonant cavity; the optical paths of the flat-concave optical resonant cavity are respectively a near-end reflection point D and a far-end reflection point E which are formed on the near-plane reflector 1 and the far-light source end reflector 2, as shown in fig. 2, the tracks of the near-end reflection point D are distributed in a right circular shape around the optical axis of the optical resonant cavity, and the tracks of the far-end reflection point E are also distributed in a right circular shape around the optical axis of the optical resonant cavity.
In this embodiment, the light incident structure (light incident port) and the light emergent structure (light emergent port) of the incident light are both disposed on the plane mirror 1, and the positions of the light incident structure (light incident port) and the light emergent structure (light emergent port) are located at a coincident point 6, which may be different in reflection order but coincident in position, in the near-end reflection point D, as shown in fig. 1 and 3.
Wherein, fig. 3 is a left side view of the beam path of fig. 2, the beam path between the two mirrors is: 1-1 (in) →2-1→1-2→2-2→1-3→2-3→1-4→2-4→1-5→ … … →2-17→1-18→2-18→1-19→1-20 (out), the light entrance is a reflection point where 1-1 (in) and the light exit is 1-20 (out) are coincident, and the circumferential locus of the near-end reflection point D is smaller than that of the far-end reflection point E. Meanwhile, the light beam is emitted after 40 reflections, and the absorption of a long optical path of tens of meters is realized in a volume of about 300ml, namely, the invention forms a complete long optical path to be applied to the optical delay line service TDLAS under the condition of occupying the minimum volume.
As other embodiments, the light incident structure (light incident port) and the light emergent structure (light emergent port) of the plane mirror 1 in the present invention may not be located at the same position, but only at two points close to each other, such as the light beam may be incident from 1-1 (in) and exit from 1-16 (out), which may also satisfy the technical scheme of the present invention.
The arrangement of the light incident structure (light incident port) and the light emergent structure (light emergent port) of the plane mirror 1 can make the interval between the light incident structure and the light emergent structure of the incident light as small as possible. Therefore, when the absorption cell with the flat-concave optical resonant cavity is used, on one hand, the size of the gas detector in the radial direction is smaller, the occupied space is saved, the miniaturization of the structure is realized, and the carrying is convenient. On the other hand, optical resonance can be generated, so that the path of light rays can be longer in the optical resonant cavity with smaller volume, and the subsequent gas detection work is facilitated.
Meanwhile, the outer part of the cavity of the absorption tank in the embodiment is further wrapped with the sintered metal net cover 4, so that the gas to be detected can freely pass through, and the dustproof effect can be achieved.
As shown in fig. 2, the light beam emitted by the light emitter 7 at the light emitting position a is incident into the plano-concave optical resonant cavity through the light incident structure (light incident port) 6 of the plane mirror 1 at the position C of the turning prism 5, is reflected in the plano-concave optical resonant cavity for multiple times, is emitted through the light emitting structure (light emitting port) 6 of the plane mirror 1, is conditioned by the light beam at the position C of the turning prism, and is received by the light receiver 8 at the position B of the light beam, thereby realizing the detection of the gas. The light beam in the embodiment can be folded back and forth for tens to hundreds times in the flat-concave optical resonant cavity, the track length of the light beam reaches tens of meters, and the long-optical-path light path can enable the light beam to be fully absorbed by surrounding gas, so that the detection lower limit of the gas to be detected can be improved; at the same time, for weakly absorbed gases (e.g. NH 3 ,CO,O 2 Etc.), the lower detection limit may be up to the ppb level.
Furthermore, the turning prism 5 in this embodiment is mainly used for conditioning the light beam emitted by the light emitter 7, and the light beam is incident into the plane-concave optical resonant cavity formed by the two mirrors through the plane mirror 1 at a proper angle, and is reflected for multiple times; the outgoing light beam can accurately pass through the plane reflecting mirror, and is received by the light receiver 8 after being processed by the turning prism 5. I.e. the arranged turning prism is mainly used for changing the direction of the light beam, so that the distance between the remotely arranged light emitter 7 and the light receiver 8 is as small as possible, and the space in the radial direction is saved.
As another embodiment, the turning prism 5 of the present invention may be disposed at the left end of the absorption cell cavity of the absorption cell, and of course, may be disposed at any suitable position between the right end of the light emitting and light receiving section and the left end of the absorption cell section.
When the gas in the high-temperature environment is detected, the refraction prism 5 can seal and separate the absorption cell cavity in the high-temperature environment from the light path cavity when the light containing line passes through, so that the light emitter and the light receiver cannot be affected by the temperature, and the accuracy of measured data is guaranteed.
As shown in fig. 4 and 5, the turning prism in the present embodiment is a pentaprism, fig. 4 is a side view of the pentaprism, and fig. 5 is a top view of the pentaprism. Of course, as other embodiments, other prisms may be selected as the turning prism, as long as the conditioning of the light beam is satisfied. Meanwhile, in order to reduce noise affecting the light beam, the front and rear light transmitting surfaces 5-1 of the provided turning prism 5 are coated with an antireflection film. In other embodiments, the turning prism of the present invention is not limited to a prism, and may be any other lens capable of converging light toward the optical axis, as long as the requirements are satisfied.
The light emitter 7 in this embodiment may be a laser light source, as long as the wavelength of the light beam emitted by the light source satisfies the absorption range of the gas to be measured; the light receiver 8 may be an In GaAs detector or other detector as long as detection of the light beam is satisfied.
As other embodiments, the light emitter 7 and the light receiver 8 in the present invention do not need to be provided with a light path cavity for light to pass through on the left side of the absorption tank, but may be directly provided on the left side of the absorption tank, so long as the normal operation of gas detection is satisfied.
The gas detector of the embodiment is mainly applicable to a closed high-temperature smoke area; in the use process, as shown in fig. 1, the light path cavity wrapped with the long thin-wall support steel pipe is arranged on the left side of the flue wall 11, so that the light emitter 7 and the light receiver 8 are far away from the high-temperature area, and normal operation of the light emitter and the light receiver is ensured; the right side of the flue wall is provided with a high temperature region of 450 ℃, and the absorption tank is wrapped by a dustproof and breathable sintered metal mesh cover, so that the flue wall can withstand the high temperature of 400 ℃ and maintain stable optomechanical properties. The main working principle is as follows: the laser beam emitted from the light emitter 7 is conditioned by the beam of the turning prism 5, enters the plane-concave optical resonant cavity formed by the two mirrors through the light entering structure of the plane mirror 1 at a proper angle, is turned back and forth for tens to hundreds times In the plane-concave optical resonant cavity, then precisely exits from the light emitting structure (the light emitting structure and the light entering structure are positioned at the same position) of the plane mirror, and reaches the InGaAs detector 8 after being processed by the turning prism 5, namely, propagates according to the whole light path 10 In fig. 1. The optical receiver 8 obtains the absorption spectrum line of the gas to the laser through the analysis of the photoelectric signals, and accordingly the concentration of the detected gas is calculated, so that the detection of the smoke in the high-temperature area is achieved.
Absorption cell embodiment
The absorption cell in this embodiment is identical to the absorption cell in the gas detector in structure, and will not be described here again.
In the process of optical machine structural design, the portability of the whole instrument is fully considered. The diameter of the sensor is controlled to be about 60mm by special optomechanical design, the total length is within 1m, and the weight is not more than 7Kg. Can be matched with a proper storage box body, is convenient for a single person to carry and can be used for taking various public transportation means without barriers.
The gas detector has the advantages of light and firm structure, small volume and easy transportation and deployment. The method is not only used for high-temperature monitoring and calibrating an online sensor; the method can also be used for adjusting the combustion working condition of the large-scale burner. Most preferred is for high temperature applications where operating space is limited.
The present invention has been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, and for other embodiments of the present invention, those skilled in the art can make many forms for the optical parameters such as the lens shape and size, the cavity size and the arrangement structure of the flat-concave resonant cavity in the absorption cell, through the corresponding calculation formulas related to the optical axis, the number of reflections, and the structures and parameters of the two reflectors, which are all within the scope of the present invention.
Claims (9)
1. The utility model provides a gas detector's absorption cell, including absorption cell cavity and near-light source end speculum, the far-light source end speculum that set up about in the absorption cell cavity, the absorption cell still includes the income light structure of incident light, the light-emitting structure of emergent light, near-light source end speculum, the far-light source end speculum in the absorption cell cavity constitutes the optical resonant cavity of optical axis for controlling the horizontal axis that extends, the light path of optical resonant cavity forms near-end reflection point, distal end reflection point on near-light source end speculum, far-light source end speculum respectively, its characterized in that: the near light source end reflector and the far light source end reflector are respectively a plane reflector and a concave reflector, the plane reflector and the concave reflector form a plane-concave optical resonant cavity, the near end reflecting points and the far end reflecting points are all circumferentially distributed around the optical axis, the light inlet structure and the light outlet structure are arranged on the plane reflector, and the positions of the light inlet structure and the light outlet structure are positioned on one coincident point which is different in reflection sequence and coincides in position in the near end reflecting points or on two points which are close to each other in the near end reflecting points; the circumferential track of the near-end reflection points circumferentially distributed around the optical axis is smaller than the circumferential track of the far-end reflection points circumferentially distributed around the optical axis.
2. The absorption cell according to claim 1, wherein: the outside of the absorption cell cavity is provided with a dustproof ventilation sintering metal mesh cover for wrapping the absorption cell cavity.
3. The absorption cell according to claim 1, wherein: the plane reflecting mirror is fixed with the concave reflecting mirror through the superalloy supporting rod.
4. The utility model provides a gas detector, includes the absorption cell and sets up in left light emitter, the light receiver of absorption cell, the absorption cell includes near light source end speculum, the far-reaching headlamp end speculum that sets up about in absorption cell cavity and the absorption cell cavity, the absorption cell still includes the income light structure of incident light, the play light structure of exit light, near light source end speculum, the far-reaching headlamp end speculum in the absorption cell cavity constitutes the optical resonant cavity of the horizontal axis that the optical axis extends about, the light path of optical resonant cavity forms near-end reflection point, distal end reflection point on near light source end speculum, far-reaching headlamp end speculum respectively, its characterized in that: the near light source end reflector and the far light source end reflector are respectively a plane reflector and a concave reflector, the plane reflector and the concave reflector form a plane-concave optical resonant cavity, the near end reflecting points and the far end reflecting points are all circumferentially distributed around the optical axis, the light inlet structure and the light outlet structure are arranged on the plane reflector, and the positions of the light inlet structure and the light outlet structure are positioned on one coincident point which is different in reflection sequence and coincides in position in the near end reflecting points or on two points which are close to each other in the near end reflecting points; the circumferential track of the near-end reflection points circumferentially distributed around the optical axis is smaller than the circumferential track of the far-end reflection points circumferentially distributed around the optical axis.
5. The gas detector of claim 4, wherein: the gas detector is provided with a light path cavity for light to pass through on the left side of the absorption tank, and the light emitter and the light receiver are arranged at the left end of the light path cavity.
6. The gas detector of claim 4, wherein: the outside of the absorption cell cavity is provided with a dustproof ventilation sintering metal mesh cover for wrapping the absorption cell cavity.
7. The gas detector of claim 4, wherein: the plane reflecting mirror is fixed with the concave reflecting mirror through the superalloy supporting rod.
8. A gas detector according to claim 5, wherein: the device also comprises a turning lens for changing the direction of the light beam, so that the light beam gathers towards the direction of the optical axis; the deflection lens is arranged at the left end of the absorption tank, or is arranged at the right end of the light path cavity, or is arranged between the absorption tank cavity and the light path cavity in a separated mode, so that the absorption tank cavity and the light path cavity are sealed and blocked while the light containing line passes through.
9. A gas detector according to claim 8, wherein: the turning lens is a turning prism.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611261215.4A CN106483071B (en) | 2016-12-30 | 2016-12-30 | Gas detector and absorption tank thereof |
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| CN201611261215.4A CN106483071B (en) | 2016-12-30 | 2016-12-30 | Gas detector and absorption tank thereof |
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| CN106483071B true CN106483071B (en) | 2023-08-22 |
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| CN109001154B (en) * | 2018-06-13 | 2021-04-09 | 湖州师范学院 | Efficient seed vigor measuring system based on laser absorption spectrum technology |
| EP3598103B1 (en) * | 2018-07-20 | 2022-03-09 | Siemens Aktiengesellschaft | Gas analyser and method of gas analysis |
| CN109470638B (en) * | 2018-10-31 | 2021-05-07 | 上海禾赛光电科技有限公司 | Laser gas detection device |
| CN111896475A (en) * | 2020-07-29 | 2020-11-06 | 东北大学秦皇岛分校 | Light path range-extending type photoacoustic cell for photoacoustic spectrum trace gas detection |
| CN111948157B (en) * | 2020-07-31 | 2024-02-27 | 中国电子科技集团公司第四十一研究所 | Long-optical-path tunable absorption cell and emergent light beam acquisition method thereof |
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