CN104483284A - Optical system and detection device for flue gas monitor - Google Patents
Optical system and detection device for flue gas monitor Download PDFInfo
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- CN104483284A CN104483284A CN201410846107.8A CN201410846107A CN104483284A CN 104483284 A CN104483284 A CN 104483284A CN 201410846107 A CN201410846107 A CN 201410846107A CN 104483284 A CN104483284 A CN 104483284A
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- flue gas
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- inserting tube
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Abstract
The invention discloses an optical system and a detection device for a flue gas monitor. The optical system mainly includes a convex lens and a cube-corner prism. The optical system for the flue gas monitor has the advantages as follows: high reflectance is guaranteed, while the emergent ray is parallel to the incident ray all the time when the incident light enters the cube-corner prism from the bottom surface and the cube-corner prism rotates towards any direction by taking the vertex as the center, so that the installation requirement and the difficulty of calibration are lowered greatly, and the error caused by the vibration during the use is reduced. The detection device adopting the optical system has the advantages that the calibration is easy and the precision is high; besides, the detection device provided by the invention adopts a plug-type detection exploration tube, thereby being simple in structure, convenient to mount and dismount, and good in application prospect in gas detection aspect.
Description
Technical field
The present invention relates to a kind of flue gas inspection device, be specifically related to a kind of optical system and the pick-up unit that utilize the flue gas monitoring instrument of spectral technique; Belong to gas detection technology field.
Background technology
Along with the continuous improvement of human lives and the continuous progress of science and technology, we also more and more pay attention to the environment of its own existence, and a large amount of objectionable impuritiess that various fuel combustion is discharged have become the main source of atmospheric pollution in the world today.In order to protection of the environment, must limit the discharge of various pollutant, therefore particularly important to the monitoring of discharge flue gas, flue gas is primarily of SO
2, CO, CO
2, the composition such as hydrocarbon and oxynitrides, because different gas componants has different absorptions at different wavelength places, so, spectrum method can be utilized to detect the absorption spectrum of gas, then according to the concentration of each gas in langbobier law determination flue gas.
In the last few years, along with the development of light scattering technique, more and more deep to the research of the detection method instrument based on absorption spectroscopy techniques both at home and abroad, also plug-type checkout equipment is adopted more and more, this checkout equipment can be directly installed on flue and carry out on-line monitoring, thus its install and fast easy to maintenance.But the optical system of the pick-up unit of existing online flue gas analyser adopts normal mirror to transmit collection receiving optical signals mostly in the market, installation accuracy requires very high or needs extremely complicated receiving light path, there is the defects such as optical correction's difficulty, mechanical erection process be complicated, expensive, need improvement badly.
Summary of the invention
For solving the deficiencies in the prior art, the object of the present invention is to provide the optical system that a kind of lens and prism of corner cube form and the pick-up unit applying this optical system, complicated receiving light path is not needed for the accuracy requirement of installing is not high yet, and do not affect the reflecting effect of light path, pick-up unit has that easy calibration, precision are high, novel structure, low cost of manufacture, the many merits such as easy for removal and installation.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
An optical system for flue gas monitoring instrument, comprising: infrared light supply, the first convex lens, prism of corner cube, the second convex lens and photodetector; First convex lens, between the second convex lens and prism of corner cube, form surveyed area; The infrared light that infrared light supply sends produces infrared parallel beam through the first convex lens and injects in surveyed area, reflexes to the second convex lens again and focus to photodetector behind the bottom surface of incident angle cone prism through prism of corner cube.
Further, aforementioned infrared light supply is positioned at the focus place of the first convex lens, and described photodetector is positioned at the focus place of the second convex lens.
Preferably, aforementioned infrared light supply is tunable Distributed Feedback Laser.
Again preferably, aforementioned first convex lens and the second convex lens are plano-convex lens.
In addition, the invention also discloses a kind of pick-up unit of flue gas monitoring instrument, except comprising aforesaid optical system, also comprise: permission flue gas diffuses to detection inserting tube, calibration air chamber and trapping system in its inner chamber; Infrared light supply, the first convex lens, the second convex lens and photodetector are installed in a compartment, and described prism of corner cube is installed on the one end detected away from compartment in inserting tube; Calibration air chamber is between detection inserting tube and compartment, and described calibration air chamber comprises: temperature sensor, pressure transducer, calibrating gas entrance and purge gas entrance; Described trapping system is at detection inserting tube and calibrate between air chamber to prevent infrared light from directly reflecting and separate calibration air chamber and detect inserting tube.
Further, the micro-adjusting mechanism for regulating the first convex lens and the second convex lens position angle is also provided with in aforementioned compartment.
Preferably, the wall body of aforementioned detection inserting tube is provided with multiple stainless steel sintered filter.
Further, the outer wall of aforementioned detection inserting tube is also wound with reference gas channel, and described reference gas channel is communicated with calibrating gas entrance.
Particularly, aforementioned purge gas entrance and the inner space detecting inserting tube.
Again further, aforementioned detection inserting tube length is 1m, and the output center wavelength of infrared light supply is locked in object wave strong point through temperature sensor and pressure transducer, and the diameter of the first convex lens is 12.7mm, focal length F
1for 11.53mm, the diameter of infrared parallel beam is 4mm, and the diameter of the second convex lens is 25mm, focal length F
2for 46.75mm, the Edge Distance of the first convex lens and the second convex lens is 6.4mm, and the effective aperture of prism of corner cube is 45.72mm, and the pick-up unit of this structure is applicable to detect flue ammonia concentration.
Usefulness of the present invention is: optical system of the present invention forms primarily of convex lens and prism of corner cube, advantage is reflectivity height simultaneously when light is incident from bottom surface, no matter prism of corner cube rotates to any direction centered by summit, emergent ray is parallel with incident ray all the time, this greatly reduces installation requirement and calibration difficulty, also reduces the error in use produced because of vibration simultaneously; Apply the pick-up unit of this optical system, have easy calibration, advantage that precision is high, meanwhile, pick-up unit of the present invention adopts plug-type detection inserting tube, and structure is simple, facilitates installing/dismounting, has a good application prospect in gas detect.
Accompanying drawing explanation
Fig. 1 is the index path of the optical system of a kind of flue gas monitoring instrument of the present invention;
Fig. 2 is the structural representation of the pick-up unit of a kind of flue gas monitoring instrument of the present invention.
The implication of Reference numeral in figure: 1, the first convex lens, the 2, second convex lens, 3, prism of corner cube, 4, infrared light supply, 5, photodetector, 6, detect inserting tube, 7, filtrator, 8, the oblique glass of trapping, 9, pressure transducer, 10, temperature sensor, 11, compartment, 12, micro-adjusting mechanism, 13, calibrating gas entrance, 14, purge gas entrance, 15, reference gas channel.
Embodiment
Below in conjunction with the drawings and specific embodiments, concrete introduction is done to the present invention.
The optical system of flue gas monitoring instrument of the present invention, comprising: infrared light supply 4, first convex lens 1, prism of corner cube 3, second convex lens 2 and photodetector 5.As shown in Figure 1, the first convex lens 1 and the second convex lens 2 can be arranged side by side its light path, constitute surveyed area between the first convex lens 1, second convex lens 2 and prism of corner cube 3; The infrared light that infrared light supply 4 sends produces infrared parallel beam through the first convex lens 1 and enters in surveyed area, reflexes to the second convex lens 2 again and focus to photodetector 5 behind the bottom surface of incident angle cone prism 3 through prism of corner cube 3.In order to obtain accurate measurement result, infrared light supply 4 is preferably positioned at the focus place of the first convex lens 1, and photodetector 5 is preferably positioned at the focus place of the second convex lens 2, first convex lens 1 and the second convex lens 2 are preferably plano-convex lens, and the first convex lens 1, second convex lens 2 and prism of corner cube 3 all adopt can resistant to elevated temperatures K9 glass.
In order to the gas detect making optical system of the present invention can be applicable to different wave length, infrared light supply 4 preferably adopts tunable Distributed Feedback Laser, by regulating laser temperature to change output wavelength, finding absorption peak in the mode scanned, then the output wavelength of laser instrument is locked in absorption peak position.
In addition, the invention also discloses a kind of pick-up unit of flue gas monitoring instrument, except comprising optical system recited above, also comprise: detect inserting tube 6, calibration air chamber and trapping system.
Detection inserting tube 6 inserts in flue and detects, and the environment facies in flue are when severe, therefore detection inserting tube 6 preferably adopts the 316L stainless steel of high temperature resistant, resistance to pitch corrosion to make, the inner chamber detecting inserting tube 6 is surveyed area, and thus detecting inserting tube 6 must be allow flue gas to diffuse in its inner chamber.As shown in Figure 2, preferably multiple stainless steel sintered filter 7 is set on the wall body detecting inserting tube 6, flue gas molecule in flue is diffused in the inner chamber detecting inserting tube 6 incessantly by filtrator 7, enter surveyed area to measure, and the dust in flue gas floats over filtrator 7 surface, to guarantee without solid particle interference in measurement gas, the optical module simultaneously in guarantee measuring chamber not by contamination by dust, and then improves the serviceable life of measuring accuracy and device.
In order to reduce daily servicing, as shown in Figure 2, infrared light supply 4, first convex lens 1, second convex lens 2 and photodetector 5 are all installed in a compartment 11.Calibration air chamber, between detection inserting tube 6 and compartment 11, specifically comprises: temperature sensor 10, pressure transducer 9, calibrating gas entrance 13 and purge gas entrance 14, and prism of corner cube 3 is installed on the one end detected away from compartment 11 in inserting tube 6.Detection of the present invention is based on infrared absorption spectroscopies principle, and laser sends from infrared light supply 4, and enter through calibration air chamber and detect in inserting tube 6, laser passes photodetector 5 by the prism of corner cube 3 detecting inserting tube 6 end back through three transmittings.
Meanwhile, The invention also achieves the on-line monitoring of temperature and pressure, wherein, temperature sensor 10 adopts K galvanic couple for detecting the temperature of air chamber, and pressure transducer 9 is for detecting the pressure of air chamber.
Further, the receiving end in compartment 11 is also provided with micro-adjusting mechanism 12, guarantees to accept light beam as much as possible, ensures the precision of tested gas analysis.In addition, between detection inserting tube 6 and calibration air chamber, be provided with the trapping system both separated, to prevent laser straight from connecing reflection, preferred trapping system is the oblique glass 8 of a trapping.
Because the dust in flue can be adsorbed on filtrator 7, therefore, need regularly to carry out blowback to detection inserting tube 6, purge gas entrance 14 and the inner space detecting inserting tube 6, dust can be blown back flue to the inner chamber blowback pressurized air detecting inserting tube 6, avoid blocking filter 7, thus guarantee normal measurement.
We said above, calibration air chamber comprises a calibrating gas entrance 13, so-called calibrating gas, namely be the sample gas knowing its concentration, in order to realize device calibration and then improve measuring accuracy, in order to even transfer criteria gas, with reference on the bending outer wall being wrapped in detection inserting tube 6 of gas passage 15, and reference gas channel 15 is communicated with calibrating gas entrance 13, instrumental calibration can be realized thus.
In order to understand the present invention better, we are to measure flue ammonia, by temperature regulation circuit, laser instrument output center wavelength is locked in object wave strong point, so-called " target wavelength " is namely the wavelength location at the characteristic absorption peak place of gas to be detected herein, be positioned near 1500nm for its absorption peak ammonia, this wavelength can avoid H effectively
2o, CO
2deng the interference of gas, the light that laser instrument sends is through focal length F
1=11.53mm first convex lens 1 are dispersed for diameter is about the light beam of 4mm, enter the long plug-in type of about 1m and detect inserting tube 6, after three total reflections of the prism of corner cube 3 of inserting tube other end effective aperture 45.72mm, pass back through F
2=46.75mm second convex lens 2 focus on photodetector 5.Wherein, the diameter of the first convex lens 1 is 12.7mm, and the diameter of the second convex lens 2 is 25mm, and the distance S between two lens is 6.4mm.When measuring other gases, only need adjust the centre wavelength of laser instrument, suitably regulate above-mentioned each distance, highly versatile simultaneously.
To sum up, the less demanding and light channel structure of optical system installation accuracy of the present invention is simple, and pick-up unit is easily calibrated, precision is high and easy for removal and installation.
More than show and describe ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand, and above-described embodiment does not limit the present invention in any form, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, and all drops in protection scope of the present invention.
Claims (10)
1. an optical system for flue gas monitoring instrument, is characterized in that, comprising: infrared light supply, the first convex lens, prism of corner cube, the second convex lens and photodetector; First convex lens, between the second convex lens and prism of corner cube, form surveyed area; The infrared light that infrared light supply sends produces infrared parallel beam through the first convex lens and injects in surveyed area, reflexes to the second convex lens again and focus to photodetector behind the bottom surface of incident angle cone prism through prism of corner cube.
2. the optical system of a kind of flue gas monitoring instrument according to claim 1, is characterized in that, described infrared light supply is positioned at the focus place of the first convex lens, and described photodetector is positioned at the focus place of the second convex lens.
3. the optical system of a kind of flue gas monitoring instrument according to claim 1, is characterized in that, described infrared light supply is tunable Distributed Feedback Laser.
4. the optical system of a kind of flue gas monitoring instrument according to claim 1, is characterized in that, described first convex lens and the second convex lens are plano-convex lens.
5. a pick-up unit for flue gas monitoring instrument, is characterized in that, comprises the optical system as described in any one of claim 1-4, also comprises: permission flue gas diffuses to detection inserting tube, calibration air chamber and trapping system in its inner chamber; Infrared light supply, the first convex lens, the second convex lens and photodetector are installed in a compartment, and described prism of corner cube is installed on the one end detected away from compartment in inserting tube; Calibration air chamber is between detection inserting tube and compartment, and described calibration air chamber comprises: temperature sensor, pressure transducer, calibrating gas entrance and purge gas entrance; Described trapping system is at detection inserting tube and calibrate between air chamber to prevent infrared light from directly reflecting and separate calibration air chamber and detect inserting tube.
6. the pick-up unit of a kind of flue gas monitoring instrument according to claim 5, is characterized in that, is also provided with the micro-adjusting mechanism for regulating the first convex lens and the second convex lens position angle in described compartment.
7. the pick-up unit of a kind of flue gas monitoring instrument according to claim 5, is characterized in that, the wall body of described detection inserting tube is provided with multiple stainless steel sintered filter.
8. the pick-up unit of a kind of flue gas monitoring instrument according to claim 5, is characterized in that, the outer wall of described detection inserting tube is also wound with reference gas channel, and described reference gas channel is communicated with calibrating gas entrance.
9. the pick-up unit of a kind of flue gas monitoring instrument according to claim 5, is characterized in that, described purge gas entrance and the inner space detecting inserting tube.
10. the pick-up unit of a kind of flue gas monitoring instrument according to any one of claim 5-9, it is characterized in that, described detection inserting tube length is 1m, the output center wavelength of infrared light supply is locked in object wave strong point through temperature sensor and pressure transducer, the diameter of the first convex lens is 12.7mm, focal length F
1for 11.53mm, the diameter of infrared parallel beam is 4mm, and the diameter of the second convex lens is 25mm, focal length F
2for 46.75mm, the Edge Distance of the first convex lens and the second convex lens is 6.4mm, and the effective aperture of prism of corner cube is 45.72mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410846107.8A CN104483284A (en) | 2014-12-31 | 2014-12-31 | Optical system and detection device for flue gas monitor |
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|---|---|---|---|
| CN201410846107.8A CN104483284A (en) | 2014-12-31 | 2014-12-31 | Optical system and detection device for flue gas monitor |
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| CN104483284A true CN104483284A (en) | 2015-04-01 |
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| CN201410846107.8A Pending CN104483284A (en) | 2014-12-31 | 2014-12-31 | Optical system and detection device for flue gas monitor |
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Cited By (6)
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| CN106053351A (en) * | 2016-07-06 | 2016-10-26 | 北京新叶能源科技有限公司 | In-situ flue gas online measuring device |
| CN107271365A (en) * | 2017-08-23 | 2017-10-20 | 华纳创新（北京）科技有限公司 | A kind of device of on-line determination the escaping of ammonia in situ |
| CN109709059A (en) * | 2019-01-17 | 2019-05-03 | 上海化工研究院有限公司 | A kind of long light path pulsed infrared laser light absorption type gas sampling monitoring device |
| CN110346325A (en) * | 2018-04-06 | 2019-10-18 | 横河电机株式会社 | Gas analyzing apparatus |
| CN110389102A (en) * | 2018-04-16 | 2019-10-29 | 横河电机株式会社 | Gas analyzing apparatus |
| CN110389109A (en) * | 2018-04-16 | 2019-10-29 | 横河电机株式会社 | Gas analyzing apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Address after: 215300 Kunshan City, Jiangsu province high tech Zone, Fung Road, No. 232, No. Applicant after: Suzhou Mandke photoelectric Co Ltd Address before: 215300 Kunshan City, Jiangsu province high tech Zone, Fung Road, No. 232, No. Applicant before: Suzhou Aodeke Photoelectric Co., Ltd. |
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Application publication date: 20150401 |
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