CN101629900A - Calibration device and method of online laser gas analysis system - Google Patents
Calibration device and method of online laser gas analysis system Download PDFInfo
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- CN101629900A CN101629900A CN200910063270A CN200910063270A CN101629900A CN 101629900 A CN101629900 A CN 101629900A CN 200910063270 A CN200910063270 A CN 200910063270A CN 200910063270 A CN200910063270 A CN 200910063270A CN 101629900 A CN101629900 A CN 101629900A
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Abstract
The invention relates to a calibration device and a calibration method of a laser gas analysis system and the laser gas is obtained by coupling the light which is emitted by a laser by an optical fibre, wherein, the calibration device is composed of a laser (8), an optical switch (9), a standard air chamber (10) and a launch interface (11); the optical switch (9) is arranged in a main engine unit (1) of the online laser gas analysis system and is connected with the laser (8) in the main engine unit (1); the optical switch (9) is further connected with the standard air chamber (10) and the launch interface (11); standard to-be-detected gas is sealed in the standard air chamber (10); the launch interface (11) is connected with a launch unit (2) of the online laser gas analysis system. The calibration time is short by adopting the calibration method of the device, and multiple repeated calibrations can be accomplished in a minute; the calibration is programmed with no need of human intervention, and the system state can be monitored at any time; the calibration device has simple structure, and only the light path is improved without changing the structure of field installation, therefore, the current system is easy to be upgraded.
Description
Technical field
The present invention relates to a kind of caliberating device and method of online laser gas analysis system, the caliberating device and the scaling method of the laser gas analysis system that the light process optical fiber that particularly a kind of laser instrument sends is coupled out.
Background technology
Online gas analysis system is compared the advantage of traditional sampling mode gas analysis system, be that it does not need sampling and preprocessing process, a lot of defectives of traditional sampling mode gas analysis system have been overcome, has the reliability height, the measurement response speed is fast, the analysis precision height, in industrial process control, fields such as safety have obtained application more and more widely.
General online optical gas analytic system comprises several essential parts: light emitting devices, optical pickup apparatus, signal analysis device, driving control device.Generally be on tested gas pipeline, to open two holes, make light through pipeline to be measured.Because site environment is abominable, generally also to add the cleaning that purging system guarantees optical window.
Be not subjected to other gas interference, precision advantages of higher because tunable semiconductor laser absorption spectrum (TDLAS) method has, have this to use widely in a lot of fields, particularly metallurgy industry.But because the rig-site utilization environment very severe of these industries, many etc. as temperature height, dust, make the maintenance of system particularly demarcate relatively difficulty.The aging meeting of light source and electronic devices and components etc. causes the slow drift of analytic system parameter, and therefore the accuracy that influence is measured need periodically demarcate online gas analysis system.
The patent No. is that 5517314 US Patent specification discloses a kind of online gas analysis system with on-line proving function, comprises light emitting devices, demarcates and measuring channel optical pickup apparatus, analytical equipment; Principle of work is as follows: the light that light source sends is reflected into two bundle directional lights through two concave mirrors, pass through closed conduct and measuring channel respectively, enter into optical pickup apparatus, reflect into optical receiver, deliver to the analytical equipment analysis by optical fiber afterwards through two concave mirrors.On demarcating light path, outside the tested gas pipeline marked gas chamber is arranged, chamber also can be placed in the tested process gas pipeline and allow the demarcation light beam pass through, the tested gas of zero gas or concentration known charges into chamber by valve control, and purge gas feeds measuring channel by ventilating joint; When the needs timing signal, the computer control motor is seated in block body and measures on the light path, opens valve, charges into the tested gas of zero gas or concentration known at chamber, demarcates the light of light path and sends into analytical equipment by receiver.During measurement, the computer control motor is seated in block body and demarcates on the light path, and measuring beam is sent into analytical equipment by receiver.
This patented technology can realize on-line proving, but the device complexity of this technology, such as: in the Optical Transmit Unit the inside, the light that light source sends becomes two bundle directional lights through the concave mirror back reflection, reflect into a receiver by concave mirror again, this exigent machining and assembly precision at this two bundles directional light of light receiving unit; Have, demarcate and measure and need independently carry out in two pipelines, can not effectively utilize measuring channel and demarcate, causing increases difficulty when installing and debug.
The Chinese patent of the patent No. 200510060779.7 has also been introduced a kind of online gas analysis system with on-line proving function.System comprises light emitting devices, optical pickup apparatus, signal analysis device, mechanical connecting structure and measuring tube, and light emitting devices and optical pickup apparatus connect on tested gas pipeline by mechanical connecting structure.The design philosophy of this system is along light path the measuring tube that can stretch to be installed in the pipeline at the scene, when needs are demarcated, stretch out this measuring tube form one with tested gas-insulated pipeline, demarcate by inwardly charging into zero gas or gas.This system can onlinely demarcate, but need in the pipeline of measure field, form a measuring channel vertical with air-flow, and the flexible mechanism of a control survey pipe will be installed, too abominable in view of field environmental condition, the practicality of this scheme is very not strong.
Another has the online gas analysis system of on-line proving function, and it is to preestablish a closed chamber near light emitting devices or optical pickup apparatus place.When the tested process gas pipelines of situation such as running into maintenance need be stopped the supple of gas or steam, the tested gas that charges into zero gas and concentration known in chamber respectively carried out zero setting and demarcation.But the shortcoming of this technology is to use at any time, because this calibration process is more consuming time, and will arrives the pipeline scene and carry out.In the middle of the normal process process, can't demarcate, staking-out work is only carried out under conditions such as pipeline maintenance.
Figure of description Fig. 1 is existing typical laser gas analysis system block diagram.Mainly partly constitute by main computer unit 1, transmitter unit 2, receiving element 5, mechanical fastening system 3, blow device 6 etc., also there is employing that host machine part 1 is incorporated into transmitter unit 2, with the reduction one-piece construction, mechanical fastening system fixed gas pipeline 4 is tested gas 7 in the gas pipeline 4.Most of gas that needs to detect all has absorption peak in the optical fiber communication wave band, so the light that laser instrument sends in a lot of laser gas analysis system main computer unit all is coupled out by optical fiber.Along with development of fiber technology, the optical fiber that is used for infrared wavelength has also obtained application.
Summary of the invention
The objective of the invention is provides a kind of caliberating device and scaling method that is applicable to the online laser gas analysis system that light that laser instrument sends is coupled out through optical fiber in simple and practical mode.
Technical solution of the present invention is: a kind of caliberating device of online laser gas analysis system, form by laser instrument, photoswitch, standard air chamber and emission interface, photoswitch is arranged in the main computer unit of online laser gas analysis system, and be connected with laser instrument in the main computer unit, photoswitch also connects standard air chamber and emission interface, the tested gas of seal standard in the standard air chamber, the standard air chamber is arranged in the main computer unit or is arranged on outside the main computer unit, and emission interface is connected with the transmitter unit of online laser gas analysis system.The technical program is integrated into caliberating device the main computer unit the inside of online laser gas analysis system.By this technical scheme, as follows to the demarcating steps of online laser gas analysis system:
1. after the light that sends of laser instrument was coupled out through optical fiber, by gas pipeline, the signal that receiving element receives was a background signal by photoswitch control;
2. after the light that sends of laser instrument is coupled out through optical fiber, entered behind the standard air chamber by gas pipeline by photoswitch control, the signal that receiving element receives is the stack of background signal and standard gas signal;
3. the signal that 1. step is gathered is removed from the signal that 2. step gathers, and obtains the standard aspiration and receives the signal that produces, and the signal that utilizes standard gas to produce is demarcated online laser gas analysis system.
Carrying out normal pipeline gas concentration when detecting, photoswitch control light path is by the standard air chamber, and this moment, the analytic system duty was the same with the General System duty.
When needs carry out timing signal, general pipeline all is in the state of quitting work substantially, such as pipeline between turn(a)round, perhaps in the gap of technological process.Such as steelmaking process was a process cycle with about 40 minutes generally, wherein had more than ten minute and stopped ventilation, and gas is static relatively in the pipeline.Because our scaling method does not need to bleed at the scene and gas replenishment process, and whole process all can be by programming by system's control operation automatically, it is very short to demarcate required time, carries out system calibrating the off time of each process cycle so can utilize fully.
Timing signal is at first controlled photoswitch and is not entered the standard air chamber directly by gas pipeline, and this moment, the signal of receiving element collection was regarded background signal as; Control photoswitch then and allow light earlier through just passing through gas pipeline behind the standard air chamber, this moment, the signal of receiving element collection was the stack of background signal and standard gas signal.Because the interior gas flow of pipeline this moment is very little, photoswitch speed is at Millisecond, and system carries out the required time of input less than one second, even carry out data processing, required time can think that also only in the magnitude of second the interior gas of pipeline is static substantially altogether.So can think that the background signal the when background signal of gathering was for the first time measured with the second time is identical.Promptly obtain the standard aspiration after the signal that calibrating procedure will be gathered is for the first time removed and receive the signal that produces from the signal of gathering for the second time, utilize this standard aspiration to receive the signal that produces and just can demarcate system.
The invention has the beneficial effects as follows:
1, nominal time weak point can repeatedly repeat to demarcate in 1 minute.Each hour of every day can carry out, and unnecessary pipeline was by the time demarcated between turn(a)round.The cycle of general pipeline maintenance is very long, at least some months.
2, calibration structure is simple.Mainly light path is improved, do not needed to change field erected structure, easily existing systems is upgraded.
3, calibrating procedureization does not need human intervention.Except realizing calibrating function, supervisory system state at any time.
Description of drawings
Fig. 1 has typical online laser gas analysis system structured flowchart now.
Fig. 2 caliberating device structure principle chart of the present invention
The caliberating device structure principle chart of Fig. 3 band frequency stabilization of the present invention function
Another caliberating device structure principle chart of Fig. 4 the present invention
1. main computer units among the figure, 2. transmitter unit, 3. mechanical fastening system, 4. gas pipeline, 5. receiving element, 6. purge gas interface, 7. tested gas, 8. laser instrument, 9. photoswitch, 10. standard air chamber, 11. emission interface, 12.1 * 2 coupling mechanisms, 13. photo-detectors, 14. control circuit board, 15. optical fiber ring flanges.
Embodiment
The present invention is described further below in conjunction with accompanying drawing:
Fig. 1 is existing typical online laser gas analysis system structured flowchart, partly constitute by main computer unit 1, transmitter unit 2, receiving element 5, mechanical fastening system 3, blow device 6 etc., mechanical fastening system 3 fixed gas pipelines 4 are tested gas 7 in the gas pipeline 4.
Caliberating device of the present invention is integrated into the main computer unit the inside with calibration structure, form by laser instrument 8, photoswitch 9, standard air chamber 10 and emission interface 11, photoswitch 9 is arranged in the main computer unit 1 of online laser gas analysis system, and be connected with laser instrument 8 in the main computer unit 1, photoswitch 9 also connects standard air chamber 10 and emission interface 11.Standard air chamber 10 is arranged in the main computer unit 1 or is arranged on outside the main computer unit 1,10 li tested gases of standard that sealed the concentration known of certain pressure of standard air chamber, and the absorption length of air chamber is also known.Standard air chamber 10 two ends are with optical window sealing, and two ends are coupled with optical fiber collimator, make light enter from an end, through behind the air chamber from another one collimating apparatus coupling output.Emission interface 11 is connected with the transmitter unit 2 of online laser gas analysis system.
The method that adopts caliberating device of the present invention that online laser gas analysis system is demarcated is as follows:
1. after the light that sends of laser instrument 8 was coupled out through optical fiber, by gas pipeline 4, the signal that receiving element 5 receives was a background signal by photoswitch 9 controls;
2. after the light that sends of laser instrument 8 is coupled out through optical fiber, enter standard air chamber 10 backs by gas pipeline 4 by photoswitch 9 controls, the signal that receiving element 5 receives is the stack of background signal and standard gas signal;
3. the signal that 1. step is gathered is removed from the signal that 2. step gathers, and obtains the standard aspiration and receives the signal that produces, and the signal that utilizes standard gas to produce is demarcated online laser gas analysis system.
Fig. 2 is a kind of caliberating device structure principle chart of the present invention.Photoswitch 9 is two 1 * 2 photoswitches 9, is connected the two ends of standard air chamber 10, and the light that laser instrument 8 sends controls whether pass through standard air chamber 10 simultaneously by two 1 * 2 photoswitches 9 after being coupled out through optical fiber.Timing signal is at first controlled 1 * 2 photoswitch 9 light light path shown in the dotted line from Fig. 2 is passed through, and does not promptly directly enter gas pipeline 4 by standard air chamber 10, and this moment, the signal of receiving element 5 collections was regarded background signal as; Control 1 * 2 photoswitch 9 then light light path shown in the dot-and-dash line from Fig. 2 is passed through, promptly through just passing through gas pipeline 4 behind the standard air chamber 10, this moment, the signal of receiving element 5 collections was stacks of background signal and standard gas signal to light earlier.Promptly obtain the standard aspiration after the signal that calibrating procedure will be gathered is for the first time removed and receive the signal that produces from the signal of gathering for the second time, utilize this standard aspiration to receive the signal that produces and just can demarcate system.
Fig. 3 is the caliberating device structure principle chart of band frequency stabilization function of the present invention, can realize laser instrument frequency stabilization and self calibrating function simultaneously.Because As time goes on, laser instrument 8 can be slowly aging, and its operation wavelength might be offset the gas absorption peak.But can utilize gas absorption peak noise spectra of semiconductor lasers to carry out frequency stabilization, the adjusting by electric current and temperature adjusts back to the gas absorption peak with its wavelength.
The embodiment of Fig. 3 has adopted one 1 * 2 coupling mechanism 12,2 * 2 photoswitch 9 and a photo-detector 13, at 2 * 2 photoswitches 9 and 8 of laser instruments 1 * 2 coupling mechanism 12 is set, four interfaces of 2 * 2 photoswitches 9 connect 1 * 2 coupling mechanism 12, standard air chamber 10, emission interface 11 and photo-detector 13 respectively, photo-detector 13 connects control circuit board 14, and control circuit board 14 is connected with laser instrument 8.
Its course of work is as follows:
The frequency stabilization duty: control photoswitch 9 is in Fig. 3 dot-and-dash line optical path states.Control circuit board 14 makes its output frequency on the absorption peak of tested gas by the temperature and the electric current of control laser instrument 8.The light of laser instrument 8 output through 1 * 2 coupling mechanism 12 after, one road light enters standard air chamber 10, the light that photoswitch 9 controls are come out from standard air chamber 10 enters photo-detector 13, the signal that detector 13 detects is fed back to control circuit board 14, control circuit board 14 utilizes the frequency of this signal feedback control laser instrument 8, and it always is stabilized on the gas absorption peak.1 * 2 coupling mechanism, 12 other one road light enter emission interface 11 by photoswitch 9 controls simultaneously, realize the analyzing and testing function to gas to be measured.
The staking-out work state: when needing to demarcate, at first control photoswitch 9 in Fig. 3 dot-and-dash line optical path states, promptly directly do not enter gas pipeline 4 by standard air chamber 10, the result that gathered by receiving element 5 this moment is counted as background signal.The light path of photoswitch 9 is controlled to the dotted line state of Fig. 3 then, be that light is earlier through just passing through gas pipeline 4 behind the standard air chamber 10, received emission interface 11 from the light that standard air chamber 10 comes out by photoswitch 9 this moment, the signal that gathered by receiving element 5 this moment is the stack of background signal and standard air chamber signal, therefrom disappearing is behind the background signal of gathering previously and the standard aspiration is received corresponding signal, thereby utilizes it can realize the demarcation of system.
Like this, present embodiment can guarantee that the laser works frequency stabilization is on the gas absorption peak when normal gas analysis; Carry out timing signal, can realize the demarcation certainly of system.The switching of these two states can be carried out at any time all by programmed control.
Fig. 4 is another caliberating device structure principle chart of the present invention.For the more weak gas of some absorptance, in order to reach accuracy requirement, the volume of standard air chamber 10 may be bigger, and it is outer proper that standard air chamber 10 is arranged on main computer unit 1, and present embodiment improves on Fig. 2 basis.As shown in Figure 4, still add two 1 * 2 photoswitches 9, but between two photoswitches 9, do not have direct connection standard air chamber 10, but link to each other with optical fiber ring flange 15 on the casing in laser instrument 8 back, a pair of ring flange is arranged on the optical fiber ring flange 15, can be connected with the fibre-optical splice of outside.
If it is improper that standard air chamber 10 is placed on too greatly in the main computer unit 1, standard air chamber 10 can be placed on the outside.For the system that need carry out real-time frequency stabilization to system, can standard air chamber 10 is long-term plug-in.For the system that does not need real-time frequency stabilization, can only in that time that needs are demarcated, the standard air chamber be connected up, demarcate then.Do not need complex installation so equally, do not need pipeline maintenance by the time, still can demarcate at any time.
Claims (7)
1, a kind of caliberating device of online laser gas analysis system, by laser instrument (8), photoswitch (9), standard air chamber (10) and emission interface (11) are formed, it is characterized in that photoswitch (9) is arranged in the main computer unit (1) of online laser gas analysis system, and with main computer unit (1) in laser instrument (8) be connected, photoswitch (9) also connects standard air chamber (10) and emission interface (11), the tested gas of the interior seal standard of standard air chamber (10), standard air chamber (10) is arranged in the main computer unit (1) or is arranged on outside the main computer unit (1), and emission interface (11) is connected with the transmitter unit (2) of online laser gas analysis system.
2, a kind of scaling method of online laser gas analysis system, its characterization step is as follows:
1. after the light that sends of laser instrument (8) was coupled out through optical fiber, by gas pipeline (4), the signal that receiving element (5) receives was a background signal by photoswitch (9) control;
2. after the light that sends of laser instrument (8) is coupled out through optical fiber, enter standard air chamber (10) back by gas pipeline (4) by photoswitch (9) control, the signal that receiving element (5) receives is the stack of background signal and standard gas signal;
3. the signal that 1. step is gathered is removed from the signal that 2. step gathers, and obtains the standard aspiration and receives the signal that produces, and the signal that utilizes standard gas to produce is demarcated online laser gas analysis system.
3, the caliberating device of a kind of online laser gas analysis system as claimed in claim 1 is characterized in that standard air chamber (10) two ends are provided with optical fiber collimator.
4, the caliberating device of a kind of online laser gas analysis system as claimed in claim 1 is characterized in that standard air chamber (10) two ends seal with optical window.
5, the caliberating device of a kind of online laser gas analysis system as claimed in claim 1, it is characterized in that photoswitch (9) by two 1 * 2 light open the light (9) form, be connected the two ends of standard air chamber (10).
6, the caliberating device of a kind of online laser gas analysis system as claimed in claim 1, it is characterized in that photoswitch (9) is made up of one 2 * 2 photoswitch (9), between 2 * 2 photoswitches (9) and laser instrument (8), 1 * 2 coupling mechanism (12) is set, four interfaces of 2 * 2 photoswitches (9) connect 1 * 2 coupling mechanism (12), standard air chamber (10), emission interface (11) and photo-detector (13) respectively, photo-detector (13) connects control circuit board (14), and control circuit board (14) is connected with laser instrument (8).
7, the caliberating device of a kind of online laser gas analysis system as claimed in claim 5 is characterized in that being connected optical fiber ring flange (15) between two 1 * 2 light opens the light (9) and standard air chamber (10).
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313704A (en) * | 2010-07-03 | 2012-01-11 | 聚光科技(杭州)股份有限公司 | In-place measurement method and device for gas |
| CN102735644A (en) * | 2012-07-06 | 2012-10-17 | 北京大方科技有限责任公司 | Online calibration method of in-situ type laser gas analyzer |
| CN103616332A (en) * | 2013-12-10 | 2014-03-05 | 山东大学 | Gas detection system for eliminating influence of residual to-be-detected gas in photoelectric device |
| TWI506267B (en) * | 2010-02-16 | 2015-11-01 | Hamamatsu Photonics Kk | Gas concentration calculation device and gas concentration measurement module |
| CN105466872A (en) * | 2015-12-30 | 2016-04-06 | 聚光科技(杭州)股份有限公司 | Calibration method for in-situ gas analyzer |
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2009
- 2009-07-21 CN CN2009100632706A patent/CN101629900B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI506267B (en) * | 2010-02-16 | 2015-11-01 | Hamamatsu Photonics Kk | Gas concentration calculation device and gas concentration measurement module |
| CN102313704A (en) * | 2010-07-03 | 2012-01-11 | 聚光科技(杭州)股份有限公司 | In-place measurement method and device for gas |
| CN102313704B (en) * | 2010-07-03 | 2013-06-05 | 聚光科技(杭州)股份有限公司 | In-place measurement method for gas |
| CN102735644A (en) * | 2012-07-06 | 2012-10-17 | 北京大方科技有限责任公司 | Online calibration method of in-situ type laser gas analyzer |
| CN103616332A (en) * | 2013-12-10 | 2014-03-05 | 山东大学 | Gas detection system for eliminating influence of residual to-be-detected gas in photoelectric device |
| CN105466872A (en) * | 2015-12-30 | 2016-04-06 | 聚光科技(杭州)股份有限公司 | Calibration method for in-situ gas analyzer |
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