CN112285050A - Open-circuit type atmosphere monitoring device - Google Patents
Open-circuit type atmosphere monitoring device Download PDFInfo
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- CN112285050A CN112285050A CN202011031818.1A CN202011031818A CN112285050A CN 112285050 A CN112285050 A CN 112285050A CN 202011031818 A CN202011031818 A CN 202011031818A CN 112285050 A CN112285050 A CN 112285050A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 20
- 230000001154 acute effect Effects 0.000 claims abstract description 5
- 238000004458 analytical method Methods 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000001157 Fourier transform infrared spectrum Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
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Classifications
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- 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
-
- 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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
-
- 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
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
-
- 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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N2021/3595—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using FTIR
Abstract
The invention provides an open-circuit type atmosphere monitoring device, which comprises a light emitting unit, a detector and an analysis unit, wherein the light emitting unit is used for emitting light to the atmosphere; the light receiving unit includes: the first reflector is provided with a concave reflecting surface, and a light-transmitting window is arranged in the center of the first reflector; the second reflecting mirror is provided with a convex reflecting surface and faces the concave reflecting surface; the included angle between the central axis of the second reflector and the central axis of the first reflector is an acute angle; radius of light emitted from the second reflecting mirror
f1Is the focal length of the first mirror, f2Is the focal length of the second reflector, and R is the aperture of the first reflector. The invention has the advantages of simple structure and the like.
Description
Technical Field
The invention relates to gas analysis, in particular to an open-circuit type atmosphere monitoring device.
Background
The Fourier infrared open gas analyzer is an environmental air quality monitoring and environmental safety early warning instrument based on Fourier transform infrared spectroscopy (FTIR), and the instrument has multiple technical advantages, such as:
1. can simultaneously and continuously monitor SO in the ambient atmosphere above the city and surrounding the industrial and mining enterprises2、NO、NO2、CH4、NH3、HCl、HF、CO、CO2VOCs, malodors, etc. up to 100 in real time.
2. The monitoring system can be combined with emerging information technologies such as Internet of things, cloud computing, big data, mobile internet and space geographic information integration, monitoring results are uploaded to a data center in time, and managers can monitor the environment and atmosphere in real time and effectively prevent and control environmental safety accidents.
The open gas analyzer is divided into two parts, namely a transmitting end and a receiving end, wherein the transmitting end comprises an infrared heat radiation light source and a collimating telescope light path. The infrared radiation emitted by the light source is converged into parallel beams by the telescope. Since the measuring optical path needs to be several hundreds of meters, the aperture of the telescope usually needs to be about 250mm to ensure the collimation of the light beam. The light beam passes through an optical path of hundreds of meters and is received by a receiving end, and the receiving end comprises a converging telescope optical path, an interferometer and a detector. The diameter of the light beam is reduced to about 25cm by the light path of the converging telescope, and then the light beam is modulated by the interferometer and received by the detector.
The traditional receiving end optical path adopts a Newton telescope or Cassegrain telescope mode, the structure is complex, more lenses need to be adjusted, the stability is poor, the light receiving angle of the secondary mirror is small, and a telephoto mirror is required to be used.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the open-circuit type atmosphere monitoring device which is simple in structure, good in stability and free of using a long-focus reflector.
The purpose of the invention is realized by the following technical scheme:
the open-circuit type atmosphere monitoring device comprises a light emitting unit, a detector and an analysis unit; the open-circuit type atmosphere monitoring device further comprises:
a light receiving unit including:
the first reflector is provided with a concave reflecting surface, and a light-transmitting window is arranged in the center of the first reflector;
a second mirror having a convex reflective surface facing the concave reflective surface; an included angle between the central axis of the second reflector and the central axis of the first reflector is an acute angle; radius of light emitted from the second reflecting mirror
f1Is the focal length of the first mirror, f2Is the focal length of the second reflector, and R is the aperture of the first reflector.
Compared with the prior art, the invention has the beneficial effects that:
1. the structure is simple, and the stability is good;
the light receiving function can be realized only by using the combination of two reflectors (a first reflector with a concave reflecting surface and a second reflector with a convex reflecting surface), the structure is simple, and the stability is good;
2. a long-focus reflector is not needed;
the special design of the first reflector and the second reflector, namely the parameter design and the position design of the first reflector and the second reflector, is utilized to realize a large light receiving angle without using a long-focus reflector;
3. the accuracy is high;
the reflecting surfaces of the first reflecting mirror and the second reflecting mirror are specially designed curved surfaces, so that the parallelism of light emitted from the first reflecting mirror is improved, the interference effect of subsequent light is improved, and the accuracy of subsequent gas detection is correspondingly improved.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:
fig. 1 is a schematic structural diagram of an open-circuit type atmosphere monitoring device according to an embodiment of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 shows a schematic structural diagram of an atmosphere monitoring device according to an embodiment of the present invention, and as shown in fig. 1, the open-circuit atmosphere monitoring device includes:
a light emitting unit, a detector 21 and an analyzing unit; these are prior art in the field and are not described herein in detail;
a light receiving unit including:
a first reflector 11, wherein the first reflector 11 has a concave reflecting surface, and a light-transmitting window is arranged at the center of the first reflector 11;
a second mirror 12, the second mirror 12 having a convex reflective surface and facing the concave reflective surface; the included angle between the central axis of the second reflector 12 and the central axis of the first reflector 11 is an acute angle; radius of the light exiting the second reflecting mirror 12
f1Is the focal length of the first mirror, f2Is the focal length of the second reflector, and R is the aperture of the first reflector.
In order to improve the light receiving effect, the center of the convex surface of the second reflector is further positioned on the central axis of the second reflector.
In order to simultaneously analyze a plurality of gases, the open-circuit type atmosphere monitoring device further comprises:
the transflective mirror is arranged in the light emergent direction of the second reflecting mirror;
the third reflector is arranged in the transmission light direction of the transflective mirror, and the fourth reflector is arranged in the reflection light direction of the transflective mirror; the reflecting surfaces of the third reflector and the fourth reflector face the transflective mirror;
a driving unit for driving the third mirror or the fourth mirror to translate forward and backward along a light traveling direction;
the detector is arranged on the side part of the transflective lens and used for receiving emergent light of the transflective lens.
In order to improve the light receiving effect and the light parallelism, further, the concave surface satisfies:
In order to improve the light receiving effect and the light parallelism, further, the convex surface satisfies:
Example 2:
an application example of the open-circuit type atmosphere monitoring device according to embodiment 1 of the present invention.
In this application example, in order to monitor SO in the atmosphere2、NO、NO2、CH4、NH3、HCl、HF、CO、CO2The present embodiment adopts fourier transform infrared spectroscopy technology, and in view of this, the following technical scheme is adopted:
as shown in fig. 1, the first reflector 11 is a concave reflector with a larger aperture than the second reflector 12; the second reflector 12 is a convex reflector, and the included angle between the central axis of the second reflector and the central axis of the first reflector is an acute angle; the convex surface and the concave surface are oppositely arranged, so that external light is reflected by the concave surface and the convex surface in sequence and then is emitted from the first reflecting mirror 11; the center of the convex surface is positioned on the central axis of the first reflector; the parameters of the first reflector and the second reflector meet the following conditions:
radius of the light exiting the second reflecting mirror 12
f1Is the focal length of the first mirror, f2Is the focal length of the second reflector, and R is the aperture of the first reflector;
| Serial number | f1(mm) | f2(mm) | R(mm) | r(mm) |
| 1 | 1505 | 55 | 152.5 | 27.6 |
| 2 | 1000 | 80 | 150 | 20 |
| 3 | 800 | 50 | 100 | 25 |
The transflective lens is arranged on the light path of emergent light of the second reflecting mirror; the third reflector adopts a plane reflector and is arranged on a transmission light path of the transreflector, and the transmission light is converged on the detector after being sequentially reflected by the third reflector and the transreflector; the fourth reflector adopts a plane reflector and is arranged on a reflected light path of the transflective mirror, and the reflected light is combined with the reflected light of the transmitted light on the transflective mirror and converged on the detector after being reflected by the fourth reflector and transmitted by the transflective mirror in sequence;
the driving unit drives the fourth reflecting mirror to move in the forward direction and the reverse direction along the optical axis;
the analysis unit processes the output signal of the detector by utilizing a Fourier transform infrared spectrum technology, so that the contents of various components in the atmosphere are obtained simultaneously.
Example 3:
an application example of the open-circuit type atmosphere monitoring device according to embodiment 1 of the present invention is different from embodiment 2 in that:
the driving unit comprises a guide rail, a first group of magnets, a second group of magnets, a third group of magnets and a laser ranging module, and a gap is formed between the first group of magnets and the second group of magnets; the first group of magnets comprise a plurality of permanent magnets which are sequentially arranged, the arrangement direction is along the extension direction of the guide rail, and the N poles and the S poles of the permanent magnets alternately face the gap; the second group of magnets comprises a plurality of permanent magnets which are sequentially arranged, the arrangement direction is along the extension direction of the guide rail, and the N poles and the S poles of the permanent magnets alternately face the gap; the permanent magnets in the first group of magnets and the permanent magnets in the second group of magnets (separated by gaps) are oppositely arranged, and the magnetic poles are opposite; the third group of magnets are arranged between the first group of magnets and the second group of magnets, a plurality of electromagnets are adopted, and the magnetic field direction of the electromagnets is variable and is perpendicular to the extending direction of the guide rail.
The first group of magnets and the second group of magnets are taken as a whole, and the magnetic field direction of the electromagnets in the third group of magnets is changed alternately, so that the third group of magnets and the whole are pushed to move horizontally relatively; in this embodiment, the third group of magnets is fixed on the guide rail, the whole is slidably disposed on the guide rail, and the fourth reflecting mirror is fixed on the whole, and moves in parallel with the whole, and the laser ranging module is used to control the moving distance of the whole (the fourth reflecting mirror).
Claims (6)
1. The open-circuit type atmosphere monitoring device comprises a light emitting unit, a detector and an analysis unit; its characterized in that, open circuit formula atmosphere monitoring devices still includes:
a light receiving unit including:
a first mirror having a concave reflective surface;
a second mirror having a convex reflective surface facing the concave reflective surface; an included angle between the central axis of the second reflector and the central axis of the first reflector is an acute angle; radius of light emitted from the second reflecting mirror
f1Is the focal length of the first mirror, f2Is the focal length of the second reflector, and R is the aperture of the first reflector.
2. The open-circuit atmospheric monitoring device of claim 1, wherein the convex reflective surface is centered on a central axis of the first mirror.
3. The open-circuit atmospheric monitoring device of claim 1, further comprising:
the transflective mirror is arranged in the light emergent direction of the second reflecting mirror;
the third reflector is arranged in the transmission light direction of the transflective mirror, and the fourth reflector is arranged in the reflection light direction of the transflective mirror; the reflecting surfaces of the third reflector and the fourth reflector face the transflective mirror;
a driving unit for driving the third mirror or the fourth mirror to translate forward and backward along a light traveling direction;
the detector is arranged on the side part of the transflective lens and used for receiving emergent light of the transflective lens.
4. The open-circuit atmospheric monitoring device of claim 1, wherein the concave surface satisfies:
5. The open-circuit atmospheric monitoring device of claim 1 or 4, wherein the convex surface satisfies:
6. The open-circuit atmospheric monitoring device of claim 1, wherein the drive unit comprises:
the first group of magnets and the second group of magnets respectively comprise a plurality of permanent magnets and are arranged along two sides of the gap; the N pole and the S pole of the permanent magnet on each side of the gap face the gap alternately, the permanent magnets on the two sides of the gap are arranged oppositely, and the magnetic poles are opposite; the third group of magnets are electromagnets, are arranged between the first group of magnets and the second group of magnets, and are arranged along the extending direction of the gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011031818.1A CN112285050A (en) | 2020-09-27 | 2020-09-27 | Open-circuit type atmosphere monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011031818.1A CN112285050A (en) | 2020-09-27 | 2020-09-27 | Open-circuit type atmosphere monitoring device |
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| Publication Number | Publication Date |
|---|---|
| CN112285050A true CN112285050A (en) | 2021-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011031818.1A Pending CN112285050A (en) | 2020-09-27 | 2020-09-27 | Open-circuit type atmosphere monitoring device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2775651Y (en) * | 2005-02-21 | 2006-04-26 | 厦门大学 | Electromagnetic suspension and driving device for Fourier transform infrared spectrum interferometer moving lens |
| CN102307031A (en) * | 2011-09-08 | 2012-01-04 | 中南大学 | Magnetic suspension linear motion platform based on combination of permanent magnets and electromagnets |
| CN105739104A (en) * | 2016-05-10 | 2016-07-06 | 力合科技（湖南）股份有限公司 | Multi-beam coupling device and detection air chamber |
| CN107797296A (en) * | 2017-11-14 | 2018-03-13 | 海信集团有限公司 | A kind of attenuator, LASER Light Source and laser projection device |
| CN107797295A (en) * | 2017-11-14 | 2018-03-13 | 海信集团有限公司 | A kind of light source shrink beam system, laser light-source device and laser projection system |
| WO2019007200A1 (en) * | 2017-07-06 | 2019-01-10 | 上海合栗智能科技有限公司 | Linear motor and mover thereof |
-
2020
- 2020-09-27 CN CN202011031818.1A patent/CN112285050A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2775651Y (en) * | 2005-02-21 | 2006-04-26 | 厦门大学 | Electromagnetic suspension and driving device for Fourier transform infrared spectrum interferometer moving lens |
| CN102307031A (en) * | 2011-09-08 | 2012-01-04 | 中南大学 | Magnetic suspension linear motion platform based on combination of permanent magnets and electromagnets |
| CN105739104A (en) * | 2016-05-10 | 2016-07-06 | 力合科技（湖南）股份有限公司 | Multi-beam coupling device and detection air chamber |
| WO2019007200A1 (en) * | 2017-07-06 | 2019-01-10 | 上海合栗智能科技有限公司 | Linear motor and mover thereof |
| CN107797296A (en) * | 2017-11-14 | 2018-03-13 | 海信集团有限公司 | A kind of attenuator, LASER Light Source and laser projection device |
| CN107797295A (en) * | 2017-11-14 | 2018-03-13 | 海信集团有限公司 | A kind of light source shrink beam system, laser light-source device and laser projection system |
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Application publication date: 20210129 |