CN101251478A - Ultraviolet difference flue gas probe based on dual-light-path - Google Patents
Ultraviolet difference flue gas probe based on dual-light-path Download PDFInfo
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- CN101251478A CN101251478A CNA200810052556XA CN200810052556A CN101251478A CN 101251478 A CN101251478 A CN 101251478A CN A200810052556X A CNA200810052556X A CN A200810052556XA CN 200810052556 A CN200810052556 A CN 200810052556A CN 101251478 A CN101251478 A CN 101251478A
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- flue gas
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- gas probe
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Abstract
The invention relates to an ultraviolet differential flue gas probe suitable for on-line monitoring of flue gases, comprising a transmitting module and a receiving module. The invention is characterized in that: the transmitting module and the receiving module are arranged on the same end; optical axes of the two modules are parallel to each other; a corner prism is fixed on the other end of an optical path. The ultraviolet differential flue gas probe simplifies the adjustment operation of the optical path and reduces the adjustment difficulty, and simultaneously improves the measurement stability and prolongs the service life of a sensor.
Description
Technical field
The present invention relates to a kind of probe that is applicable to the flue gas on-line monitoring, relate in particular to a kind of ultraviolet difference flue gas probe.
Background technology
Sulphuric dioxide (SO
2) and oxides of nitrogen (NO
x) as the main gaseous contamination of atmospheric environment, reduce discharging and monitor more and more coming into one's own.For in time, accurately, systematically grasp the blowdown situation, require emission behaviours such as sulphuric dioxide are carried out continuous monitoring.Gas continuous monitoring method commonly used at present is mainly absorption spectroscopy etc.The Lambert-Beer law of light absorption is the philosophy of absorption spectroscopy measurement of species concentrations, it show when incident intensity one regularly, the absorbance of measured matter is directly proportional with the product of the concentration of measured matter and thickness.
Absorption spectroscopy is measured the general light beam that adopts ultraviolet source to send fixed band, tested gasmetry district through regular length, at last by the spectrometer receiving beam, and carry out the flue gas concentration that mode that follow-up data handles is obtained heterogeneity with certain algorithm by computing machine.
The light path of existing widely used monolateral insertion type probe is formed relatively simple for structurely as shown in Figure 1, sends light beam by ultraviolet source 1, enters tested gasmetry district 7 after passing through collimation lens 2, enters optical fiber 5 by condenser lens 3 again.In actual applications, this light path is installed on the two ends of same probe with transmitting terminal 6 and receiving end 8, and probe is provided with measurement zone, inserts flue and can begin to measure as long as will pop one's head in.Generally speaking, the environment in the flue is more abominable, and along with the prolongation of service time, the structural portion branch of light path deformation occurs because of factor such as hot and humid, and then the light intensity that received of optical fiber 5 can reduce, and this will have a strong impact on measurement effect.Need adjust outgoing simultaneously this moment, receive the position and the attitude of optical device, but inconvenience is adjusted light path at the scene, and precision optics such as optical fiber adapter 4 is in the high-temperature flue gas environment for a long time, reduce greatly serviceable life, need transform light path design.
Summary of the invention
The objective of the invention is to improve the light path design of existing flue gas measuring sonde, overcome the above-mentioned deficiency of prior art, provide a kind of under the prerequisite of finishing existing light path function, can make things convenient for on-the-spot light path to regulate, improve the flue gas on-line measurement probe of measurement stability.For this reason, the present invention adopts following technical scheme:
A kind of ultraviolet difference flue gas probe based on double light path comprises transmitter module and receiver module, it is characterized in that, transmitter module and receiver module are arranged on same end, and the optical axis of two modules is parallel to each other, and is fixed with corner cube at the other end of light path.
As preferred implementation, ultraviolet difference flue gas probe based on double light path of the present invention, transmitter module comprises ultraviolet source, parabolic mirror, collimator and extender lens, ultraviolet source places on the focus of described parabolic mirror, and the ultraviolet light of parabolic mirror reflects penetrates through the collimator and extender lens; Receiver module comprises condenser lens, receives optical fiber head, receives by receiving optical fiber head after via condenser lens via described corner cube beam reflected.
Ultraviolet difference flue gas probe double light path design of the present invention, change the device that transmits and receives of measuring beam into placement in the same way by original placement in opposite directions, and by corner cube with light path folding, thereby make light path adjust mode and change into single-ended adjustment, can realize the online adjusting and the correction of light path by the both-end adjustment.The present invention has also improved measurement stability when having simplified light path adjustment operation, having reduced the adjustment difficulty, prolonged the working sensor life-span.
Description of drawings
The light path synoptic diagram of Fig. 1 monolateral insertion type probe of the prior art.
The light path synoptic diagram of Fig. 2 ultraviolet difference flue gas probe of the present invention.
The scheme of installation of Fig. 3 ultraviolet difference flue gas probe of the present invention.
Description of reference numerals:
1 ultraviolet source, 2 collimation lenses, 3 condenser lenses, 4 optical fiber receive head
5 optical fiber, 6 transmitting terminals, 7 measurement zones, 8 receiving ends
9 parabolic mirrors, 10 collimator and extender lens, 11 corner cubes, 12 transmitter and receivers
13 reflection ends, 14 penetrating window
Embodiment
Flue gas of the present invention is measured light path and is adopted the design of primary event formula, introduces corner cube 11 as reflection device, will launch and accept device and place same end, realizes the long-term stable operation of light path by single-ended adjusting, and the specific design scheme is as follows:
(1) light path is formed and is arranged
Light path of the present invention receives devices such as 4 by ultraviolet source 1, parabolic mirror 9, collimator and extender lens 10, corner cube 11, condenser lens 3 and optical fiber successively to be formed, and light path as shown in Figure 2.
Ultraviolet source 1 is placed on the focus of parabolic mirror 9, the irradiate light that it sent forms horizontal light beam and penetrates on parabolic mirror 9, enters measurement zone 7 through collimation with after expanding bundle, by tested gas it is carried out selectivity and absorbs.Light beam after the absorption reflects by corner cube 11, enters condenser lens 3 at last.By condenser lens 3 with beam convergence to receiving 4, enter spectrometric instrument by optical fiber 5.
(2) light path feature
(1) setting of measurement zone 7: whole optical path can be installed in the sensor construction of profile such as Fig. 3, the open lower side zone is measurement zone 7, light beam transmit and receive the side that device all is positioned at sensor, optical axis is parallel to each other, opposite side only is fixed with corner cube 11.Sensor is placed in the flue, and the light source outgoing beam enters measurement zone 7 through behind the collimator and extender, subsequently through the path channels of corner cube 11 reflected back sensor internals sealing, is focused lens 3 at last and receives and assemble to optical fiber 5.
(2) reflection end 13 designs: because the present invention adopts corner cube 11 as reflection unit, and corner cube 11 itself has the characteristic that keeps incident and emergent ray to be parallel to each other, do not change optical path direction, even if sensor generation deformation, corner cube 11 still reflects light according to the direction of incident ray.Therefore, in theory, the optical axis of device is parallel to each other and spacing is constant as long as maintenance transmits and receives, and then light path just can not be interfered.
(3) device material: the optical device that is adopted in the light path is selected unified special material for use, and ultraviolet portion is had high permeability, reduces the decay of light beam in communication process to greatest extent.In addition, also avoided the non-linear influence that causes owing to the optical device material therefor is different to measuring.
(4) method of adjustment: between the on-the-spot operating period, deformation may take place because of hot and humid in the flue in the supporting construction of sensor internal, thereby make that the mutual alignment of each device is moved in the light path, cause the stopping of other devices after the partial parallel light beam is shifted, the light intensity that then enters receiving trap can seriously reduce, and influences measuring accuracy and accuracy.The present invention utilizes the characteristic of corner cube 11, and the depth of parallelism and distance between the sending and receiving apparatus on the left of only needing to regulate can restPose light path.For the light path devices that is installed to on-the-spot flue, need not sensor is taken out from flue, adjusting also is to adopt in the same way, only needs to adjust to be positioned at the attitude that the outer transmitter and receiver 12 of flue transmits and receives device and can to recover optical path states.
Ultraviolet difference flue gas probe concrete structure design of the present invention is as follows:
(1) sensor construction design
The device that transmits and receives of light beam is made modular construction respectively, and wherein transmitter module mainly comprises light source, parabolic mirror 9, collimator and extender lens 10; Receiver module comprises that mainly condenser lens 3 and optical fiber receive 4.Fix the optics positions relation of each modular device inside, make each device and module housing formation rigidity, stable connection relation.
Sensor emission receiving end 12 is provided with the multiple degrees of freedom governor motion that can lock to transmitting and receiving module respectively, can regulate the mutual attitude and the distance of two modules.
(2) method of adjustment
Sensor is duration of work in flue, if because of environmental factor such as high temperature sensor construction deformation takes place, the BEAM SQUINT condenser lens 3 that receives is accepted light intensity to reduce, and influence is measured.Then regulate the multiple degrees of freedom governor motion of transmitter and receiver 12, receive the light intensity that instrument collected according to spectrum and judge the adjustment effect, the original position relation up to recovering to transmit and receive device can make to measure and normally carry out.
(3) light path subsidiary function design
Consider the actual environment of working site, in order to prevent dust in the flue to the pollution of light path and optical device, sensor and flue gas environmental communication position should increase the clean gas of blowback.Simultaneously, transmitting and receiving device inside has a plurality of optical device, should adopt the airtight construction design to module, guarantees the cleanliness factor of inner air.
For reflection end 13, its long-term work in high dust, hot and humid environment, the as easy as rolling off a log pollution.For this reason, except being provided with blowback air and gas-tight design, also should increase other, regularly remove the dust on the corner cube 11 automatically, guarantee that light intensity is minimum in reflection end 13 decay from dust arrester.
Claims (3)
1. the ultraviolet difference flue gas probe based on double light path comprises transmitter module and receiver module, it is characterized in that, described transmitter module and receiver module are arranged on same end, and the optical axis of two modules is parallel to each other, and is fixed with corner cube at the other end of light path.
2. the ultraviolet difference flue gas probe based on double light path according to claim 1, it is characterized in that, described transmitter module comprises ultraviolet source, parabolic mirror, collimator and extender lens, described ultraviolet source places on the focus of described parabolic mirror, and the ultraviolet light of described parabolic mirror reflects penetrates through the collimator and extender lens.
3. the ultraviolet difference flue gas probe based on double light path according to claim 1 and 2, it is characterized in that, described receiver module comprises that condenser lens, optical fiber receive head, receives by receiving optical fiber head after via condenser lens via described corner cube beam reflected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810052556XA CN101251478A (en) | 2008-03-28 | 2008-03-28 | Ultraviolet difference flue gas probe based on dual-light-path |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810052556XA CN101251478A (en) | 2008-03-28 | 2008-03-28 | Ultraviolet difference flue gas probe based on dual-light-path |
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| CN101251478A true CN101251478A (en) | 2008-08-27 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297841A (en) * | 2011-05-23 | 2011-12-28 | 天津同阳科技发展有限公司 | Flue gas automatic monitor based on optical fiber transmission and signal receiving |
| CN102346134A (en) * | 2011-09-16 | 2012-02-08 | 武汉市天虹仪表有限责任公司 | Reflective long optical path air monitoring instrument |
| CN102778440A (en) * | 2012-08-06 | 2012-11-14 | 南京国电环保科技有限公司 | Total-reflection type optical system of flue gas concentration analyzer |
| CN103090972A (en) * | 2013-01-14 | 2013-05-08 | 天津大学 | Compact type full spectrum optical measuring head device used for reflection difference spectral measurement |
| CN104458588A (en) * | 2014-12-24 | 2015-03-25 | 四川威特龙消防设备有限公司 | Bidirectional self-cleaning type optical fiber gas sensor probe |
| CN105044113A (en) * | 2015-07-21 | 2015-11-11 | 青岛市光电工程技术研究院 | Sulfur dioxide gas imager |
| CN105891074A (en) * | 2016-04-12 | 2016-08-24 | 东南大学 | Dust concentration image collecting device and collecting method |
| CN108318437A (en) * | 2018-01-19 | 2018-07-24 | 中国科学院合肥物质科学研究院 | A kind of portable flue gas in-situ measurement system based on the adjustable how anti-pool technology of ultraviolet opening |
| CN112098354A (en) * | 2020-09-21 | 2020-12-18 | 国网重庆市电力公司电力科学研究院 | Ultraviolet absorption spectroscopy-based SF6 decomposition component detection device and method |
-
2008
- 2008-03-28 CN CNA200810052556XA patent/CN101251478A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297841A (en) * | 2011-05-23 | 2011-12-28 | 天津同阳科技发展有限公司 | Flue gas automatic monitor based on optical fiber transmission and signal receiving |
| CN102346134A (en) * | 2011-09-16 | 2012-02-08 | 武汉市天虹仪表有限责任公司 | Reflective long optical path air monitoring instrument |
| CN102778440A (en) * | 2012-08-06 | 2012-11-14 | 南京国电环保科技有限公司 | Total-reflection type optical system of flue gas concentration analyzer |
| CN103090972A (en) * | 2013-01-14 | 2013-05-08 | 天津大学 | Compact type full spectrum optical measuring head device used for reflection difference spectral measurement |
| CN104458588A (en) * | 2014-12-24 | 2015-03-25 | 四川威特龙消防设备有限公司 | Bidirectional self-cleaning type optical fiber gas sensor probe |
| CN104458588B (en) * | 2014-12-24 | 2017-02-22 | 威特龙消防安全集团股份公司 | Bidirectional self-cleaning type optical fiber gas sensor probe |
| CN105044113A (en) * | 2015-07-21 | 2015-11-11 | 青岛市光电工程技术研究院 | Sulfur dioxide gas imager |
| CN105044113B (en) * | 2015-07-21 | 2018-10-09 | 青岛市光电工程技术研究院 | A kind of sulfur dioxide gas imager |
| CN105891074A (en) * | 2016-04-12 | 2016-08-24 | 东南大学 | Dust concentration image collecting device and collecting method |
| CN105891074B (en) * | 2016-04-12 | 2018-11-23 | 东南大学 | A kind of dust concentration image collecting device and acquisition method |
| CN108318437A (en) * | 2018-01-19 | 2018-07-24 | 中国科学院合肥物质科学研究院 | A kind of portable flue gas in-situ measurement system based on the adjustable how anti-pool technology of ultraviolet opening |
| CN112098354A (en) * | 2020-09-21 | 2020-12-18 | 国网重庆市电力公司电力科学研究院 | Ultraviolet absorption spectroscopy-based SF6 decomposition component detection device and method |
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Open date: 20080827 |