CN104266971A - In-situ calibration device and method for online detection of pipeline gas - Google Patents
In-situ calibration device and method for online detection of pipeline gas Download PDFInfo
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- CN104266971A CN104266971A CN201410487438.7A CN201410487438A CN104266971A CN 104266971 A CN104266971 A CN 104266971A CN 201410487438 A CN201410487438 A CN 201410487438A CN 104266971 A CN104266971 A CN 104266971A
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Abstract
The invention relates to an in-situ calibration device and an in-situ calibration method for online detection of pipeline gas. A laser transmitting unit and a laser receiving unit are respectively installed on two ends of a detection pipeline through a flange, a DFB laser and a one-to-two photoswitch are arranged in the chamber of the laser transmitting unit, one output end of the one-to-two photoswitch is used for detecting to-be-detected gas inside a pipeline through a photoelectric detector of the laser receiving unit via a pipeline, another output end of the one-to-two photoswitch is connected with a calibration unit through an armored optical fiber so as to calibrate the standard gas, a high reflecting mirror is arranged in the chamber of the calibration unit, the output end of the high reflecting mirror is connected with a full-penetration full reflecting mirror in the chamber of the laser receiving unit through a restraining hole, a high reflecting mirror is installed on each of two inner sides of the chamber of the laser receiving unit in a sealing manner to form a calibration gas chamber, the output end of the full-penetration full reflecting mirror is connected with the photoelectric detector through the calibration gas chamber, a nitrogen feeding pipeline is connected to the chamber of the laser transmitting unit and the chamber of the calibration unit. By adopting the in-situ calibration device and method, the weaknesses of an offline calibration way such as complexity in dismantling can be avoided, and the calibration time can be shortened.
Description
Technical field
The present invention relates to a kind of original position caliberating device and method thereof of the pipeline gas on-line checkingi based on laser absorption spectroscopy, belong to gas analysis technology field.
Background technology
Over nearly 20 years, along with the high speed development of China's economic, factories and miness, enterprise increase gradually, and energy demand increases year by year, and air environmental pollution problem also becomes increasingly conspicuous.Air environmental pollution not only constrains economic sustainable development, and brings serious harm to people ' s health.Along with the raising of national environmental protection consciousness, propose the strategy of sustainable development, require the industry rectifying high energy consumption, high pollution, improve energy resource utilization factor, strengthen pollutant emission monitoring, improve physical environment, improve physical condition.Wherein, a large amount of consumption of natural resource, producing the industries such as the industrial and mineral of a large amount of harmful gas is rectify the importance of administering.The fundamental way of administering detects in real time the toxic and harmful that industrial processes produce; then according to testing result, production run is controlled, optimize production run, improve energy resource utilization factor; the discharge capacity of final reduction harmful gas, environment protection.
The mid-1960s, lead salt tunable diode laser is found the light source that can be used as high resolving power infrared laser absorption spectroscopy techniques after occurring immediately.Subsequently, a kind of new Trace gas detection technology obtains application, and this technology is called as t unable filter (Tunable Diode Laser Absorption Spectroscopy-TDLAS).Along with the development of optical communication and photoelectron technology, diode laser also rapidly commercialization, particularly near-infrared diode laser have that volume is little, the feature such as long-life and high electro-optical efficiency, become the perfect light source that industrial environment trace molecules detects.Relative to other spectral techniques, this technology has high sensitivity, high selectivity, in real time, dynamically, polycomponent the advantage such as to measure simultaneously, is widely adopted in the world in recent years in the noncontact real-time online context of detection of atmospheric trace gas detection and Industry Control, industrial pollution discharge.
When TDLAS technology is applied in pipeline gas concentration on-line checkingi process, its requirement must adopt calibrating gas to carry out the demarcation of system.Conventional scaling method is offline mode; its process is as follows: during system calibrating by existing detection to injection device transmitter unit and receiving element; positive pressure protection unit disassembling gets off; then the calibrating tube two ends provided are provided, in calibrating tube, are filled with high pure nitrogen after adjusting light path then record it for background signal.Again to the gas collecting to be measured high concentration signal being now filled with high concentration in calibrating tube after background signal obtains.Subtract each other with the background signal collected the demarcation signal being and will obtaining above after above-mentioned signal acquisition.Shutdown system after demarcation signal preservation; the transmitting and receiving unit at calibrating tube two ends is arranged under dismounting; be reinstalled measuring channel both sides, again carry out the adjustment of light path, light path opens system power supply after adjusting and installing with positive pressure protection can carry out on-line checkingi.Above calibration process is loaded down with trivial details, and requires that demarcation personnel have good professional skill and judgement, has certain difficulty, and add operating cost for industrial enterprise testing staff.
Therefore research and develop one and do not dismantle the online pipeline caliberating device of original position and method will have very important significance.
Summary of the invention
The object of this invention is to provide a kind of original position caliberating device and method thereof of the pipeline gas on-line checkingi based on laser absorption spectroscopy, the unloading process being intended to solve current off-line calibration method is complicated, easily produce the deficiencies such as artificial interference, calibrated error, nominal time be long.
Object of the present invention is achieved through the following technical solutions:
The original position caliberating device of pipeline gas on-line checkingi, feature is: comprise laser emission element, laser pick-off unit and demarcation unit, described laser emission element is connected with laser pick-off unit, be furnished with Distributed Feedback Laser in the chamber of laser emission element and be positioned at the one-to-two photoswitch of its output terminal, one output terminal of one-to-two photoswitch connects through the photodetector of pipeline and laser pick-off unit, another output terminal connects through armored fiber optic and demarcation unit, high reflection mirror is furnished with in the chamber of demarcation unit, the full impregnated total reflective mirror of output terminal in constrained port and laser pick-off unit chamber of high reflection mirror connects, in laser pick-off unit chamber, both sides seal respectively and install high transmission eyeglass formation demarcation air chamber, the output terminal of full impregnated total reflective mirror connects through demarcation air chamber and photodetector, nitrogen gas supply pipeline accesses to the chamber of laser emission element respectively, demarcate the chamber of unit and demarcate air chamber.
Further, the original position caliberating device of above-mentioned pipeline gas on-line checkingi, described Distributed Feedback Laser is that distributed feedback tail optical fiber exports semiconductor laser with tunable.
Further, the original position caliberating device of above-mentioned pipeline gas on-line checkingi, described high reflection mirror is level crossing, is connected with the set screw controlling front and back position by the fine tuning bolt controlling the angle of pitch.
Further, the original position caliberating device of above-mentioned pipeline gas on-line checkingi, described constrained port has two.
Further, the original position caliberating device of above-mentioned pipeline gas on-line checkingi, described full impregnated total reflective mirror is the eyeglass of double-sided coating, and one side is full impregnated, and one side is for being all-trans.
Further, the original position caliberating device of above-mentioned pipeline gas on-line checkingi, described laser pick-off unit chamber is provided with and demarcates the air intake valve and valve of giving vent to anger that air chamber communicates.
Again further, the original position caliberating device of above-mentioned pipeline gas on-line checkingi, described high transmission eyeglass is non-parallel installation, and its angle of inclination is 5 degree.
Again further, the original position caliberating device of above-mentioned pipeline gas on-line checkingi, the chamber of described laser emission element is provided with window, and window is level crossing structure.
Again further, the original position caliberating device of above-mentioned pipeline gas on-line checkingi, the chamber of described laser pick-off unit is provided with window, and window is level crossing structure.
The original position scaling method of inventive pipeline gas on-line checkingi, when being operated in measuring channel gas concentration situation, laser emission element controls one-to-two photoswitch and switches to optical path, make the laser of Distributed Feedback Laser through the optical path of one-to-two photoswitch, collimated light beam after collimation is after the gas absorption to be measured in piping, by the photoelectric detector of laser pick-off unit, lock-in amplifier and the signal processing module of the signal feeding laser pick-off unit after opto-electronic conversion carry out retrieving concentration process; When needs carry out timing signal to detection system, control one-to-two photoswitch and switch to demarcation light path, by armored fiber optic, laser beam is introduced into demarcation unit, make laser beam simultaneously through beating after two constrained ports on the center of full impregnated total reflective mirror to guarantee that laser beam D and collimated light beam are through same path by high reflection mirror, light beam after the reflection of full impregnated total reflective mirror is through demarcation air chamber by photoelectric detector, and lock-in amplifier and the signal processing module of the signal feeding laser pick-off unit after opto-electronic conversion carry out Signal acquiring and processing; Calibration process is: first, in demarcation air chamber, be filled with high pure nitrogen and reach evenly, record it for background signal, and then to demarcating in air chamber the gas to be measured that is filled with high concentration and reaching the high concentration signal gathered evenly now, after high concentration signal obtains, subtract each other with the background signal gathered before the demarcation signal being and will obtaining.
The substantive distinguishing features that technical solution of the present invention is outstanding and significant progress are mainly reflected in:
1. original position of the present invention installs calibration structure online, avoids the shortcomings such as the dismounting complexity of off-line calibration mode, reduces maintenance cost;
2. adopt high reflective mirror sheet and anti-reflection high reflective mirror sheet to combine, ensure that the consistance of optical path and demarcation light path, effectively can eliminate the impact of other opticses in measuring process; Demarcate air chamber smaller and more exquisite with off-line calibration air chamber phase specific volume before, shorten nominal time and calibrating procedure;
3. utilize the medium wavelength modulator approach of TDLAS technology to carry out retrieving concentration, compare direct absorption spectroscopy techniques sensitivity higher, precision is better;
4., when testing pipes internal gas concentration is lower, can the method lifting gas background signal passing into high concentrations of gas in air chamber demarcated, and then carry out the concentration value that follow-up process obtains pipe interior gas.Can meet the requirement of the detection occasions such as concentration is low, light path is short, be not available for existing laser on-line checkingi instrument;
5. each several part unit integration packaging respectively, adopt the materials such as O-ring seal to seal, and inside is full of nitrogen atmosphere, reaches requirement of explosion proof, and in measuring process, eliminates the impact of other interference gas; Simple and easy applicable, wide market.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, technical solution of the present invention is described further:
Fig. 1: structural representation of the present invention.
Embodiment
As shown in Figure 1, the original position caliberating device of pipeline gas on-line checkingi, comprise laser emission element 1, laser pick-off unit 2 and demarcation unit 3, laser emission element 1 is installed on pipeline correlation both sides after being connected with laser pick-off unit 2 by welding DN50 flange unit 4, be furnished with Distributed Feedback Laser 5 in the chamber of laser emission element 1 and be positioned at the one-to-two photoswitch 6 of its output terminal, Distributed Feedback Laser 5 is that the distributed feedback tail optical fiber of the specific wavelength selected according to gas to be measured exports semiconductor laser with tunable, the switching that one-to-two photoswitch 6 realizes optical path A and demarcates between light path B, one output terminal of one-to-two photoswitch 6 connects through the photodetector 19 of pipeline and laser pick-off unit 2, another output terminal connects through armored fiber optic 10 and demarcation unit 3, armored fiber optic 10 connects the end optical fiber flange plate 9 of laser emission element 1 and the end optical fiber flange plate 11 of demarcating unit 3, high reflection mirror 12 is furnished with in the chamber of demarcation unit 3, high reflection mirror 12 is level crossing, be connected with the set screw 14 controlling front and back position by the fine tuning bolt 13 controlling the angle of pitch, there is high reverse--bias function, controlled the angle of pitch of high reflection mirror 12 by fine tuning bolt 13 in adjustment process, set screw 14 controls the front and back position of high reflection mirror 12, make laser beam D simultaneously through two constrained ports 15, constrained port 15 has two, laser beam D is passed simultaneously, ensure the absolute reflection angle 45 degree of itself and full impregnated total reflective mirror 16, the full impregnated total reflective mirror 16 of output terminal in constrained port 15 with laser pick-off unit 2 chamber of high reflection mirror 12 connects, full impregnated total reflective mirror 16 is the eyeglass of double-sided coating, a face is collimation light beam C full impregnated, b face is for be all-trans to laser beam D, in laser pick-off unit 2 chamber, both sides seal respectively and install high transmission eyeglass formation demarcation air chamber 22, the high transmission eyeglass 20 in left side is non-parallel installation with the high transmission in right side eyeglass 21, to avoid the appearance of the noise signals such as interference, its angle of inclination is 5 degree, demarcating air chamber 22 is the sealed air chamber of length 10cm, be filled with object gas by air intake valve 23 and valve 24 of giving vent to anger and gather corresponding signal, the output terminal of full impregnated total reflective mirror 16 connects with photodetector 19 through demarcating air chamber 22, nitrogen gas supply pipeline 25 accesses to the chamber of laser emission element 1 respectively, demarcate the chamber of unit 3 and demarcate air chamber 22.
The chamber of laser emission element 1 is provided with window 8, window 8 is level crossing structure, and its material is CaF
2, connected by transfer tube 7 and purge valve, window 8 is purged, prevents dust pollution window.The chamber of laser pick-off unit 2 is provided with window 18, window 18 is level crossing structure, and its material is CaF
2, connected by transfer tube 17 and purge valve, window 18 is purged, prevents dust pollution window.
Malleation purges unit and provides high pressure nitrogen to nitrogen gas supply pipeline 25, and one is in order to the barotropy of protection system device reaches requirement of explosion proof, and two is carry out high-pressure blowing to window, prevents the dust of testing pipes inside, the pollution of greasy dirt, affects testing result.
The original position scaling method of pipeline gas on-line checkingi, when being operated in measuring channel gas concentration situation, laser emission element 1 controls one-to-two photoswitch 6 and switches to optical path A, make the laser of Distributed Feedback Laser 5 through the optical path of one-to-two photoswitch 6, collimated light beam C after collimation is after the gas absorption to be measured in piping, received by the photodetector 19 of laser pick-off unit 2, lock-in amplifier and the signal processing module of the signal feeding laser pick-off unit 2 after opto-electronic conversion carry out retrieving concentration process, when needs carry out timing signal to detection system, control one-to-two photoswitch 6 and switch to demarcation light path B, by armored fiber optic 10, laser beam is introduced into demarcation unit 3, by high reflection mirror 12, laser beam D is beaten on the center of full impregnated total reflective mirror 16 to guarantee that laser beam D and collimated light beam C is through same path simultaneously through after two constrained ports 15, light beam after full impregnated total reflective mirror 16 reflects is received by photodetector 19 through demarcation air chamber 22, lock-in amplifier and the signal processing module of the signal feeding laser pick-off unit 2 after opto-electronic conversion carry out Signal acquiring and processing, calibration process is: first, in demarcation air chamber 22, be filled with high pure nitrogen and reach evenly, record it for background signal, and then to demarcating in air chamber 22 gas to be measured that is filled with high concentration and reaching the high concentration signal gathered evenly now, after high concentration signal obtains, subtract each other with the background signal gathered before the demarcation signal being and will obtaining.The road of whole testing process and calibration process light beam through all carrying out in positive pressure of nitrogen guard mode except region to be measured.
The principle of its foundation of laser absorption spectroscopy is Beer-Lambert law.The ratio method of elimination of what its testing process adopted is second harmonic signal and first harmonic signal eliminates light intensity, and to affect later signal be detection signal, carries out retrieving concentration according to reference to demarcation signal
T unable filter (TDLAS) is the wavelength tuning characteristic utilizing diode laser, obtains the absorption spectrum of chosen gas characteristic Absorption Line to be measured, thus carries out qualitative or quantitative test to gas to be measured.Because trace gas comparision contents is low, absorption signal is more weak, and therefore the second-harmonic detection of lock-in amplifier has been widely used in the detection of tunable diode laser absorption spectroscopy to atmospheric trace gas.According to Lambert-Beer absorption law, it is I that laser instrument sends intensity
0, frequency is the one-wavelength laser of υ, and be after the absorbing medium of L by length, the intensity recorded at receiving end is
I(υ)＝I
0(υ)exp(－σ(υ)cL) (1)
Wherein L is the optical path length of sample cell, and σ (υ) is absorption cross section, and c is the molecule number concentration absorbing gas.For near infrared molecule absorption, generally all satisfied | σ (v) cL|<<1, therefore formula (1) can be approximated to be:
I(ν)≈I
0(v)(1－σ(v)cL) (2)
Namely linear by absorbing light intensity change and concentration and light path after gas.Usually adopting lock-in amplifier to process absorption signal to improve systems axiol-ogy sensitivity, obtained second harmonic signal being analyzed, is namely expressed as follows:
I
2f∝I
0σ
0NL (3)
In sum, the present invention designs uniqueness, novel structure, and original position installs calibration structure online, avoids the shortcomings such as the dismounting complexity of off-line calibration mode, reduces maintenance cost; Adopt high reflective mirror sheet and anti-reflection high reflective mirror sheet to combine, ensure that the consistance of optical path and demarcation light path, effectively can eliminate the impact of other opticses in measuring process; Demarcate air chamber smaller and more exquisite with off-line calibration air chamber phase specific volume before, shorten nominal time and calibrating procedure; Utilize the medium wavelength modulator approach of TDLAS technology to carry out retrieving concentration, compare direct absorption spectroscopy techniques sensitivity higher, precision is better.When testing pipes internal gas concentration is lower, can the method lifting gas background signal passing into high concentrations of gas in air chamber be being demarcated, and then carry out the concentration value that follow-up process obtains pipe interior gas.The requirement of the detection occasions such as concentration is low, light path is short can be met.Not available for existing laser on-line checkingi instrument.Each several part unit is integration packaging respectively, adopt the materials such as O-ring seal to seal, and inside is full of nitrogen atmosphere, reaches requirement of explosion proof, and in measuring process, eliminates the impact of other interference gas.Can be rated as the good technology with novelty, creativeness, practicality.
It is to be understood that: the above is only the preferred embodiment of the present invention; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the original position caliberating device of pipeline gas on-line checkingi, it is characterized in that: comprise laser emission element (1), laser pick-off unit (2) and demarcation unit (3), described laser emission element (1) is connected with laser pick-off unit (2), be furnished with Distributed Feedback Laser (5) in the chamber of laser emission element (1) and be positioned at the one-to-two photoswitch (6) of its output terminal, one output terminal of one-to-two photoswitch (6) connects through the photodetector (19) of pipeline and laser pick-off unit (2), another output terminal connects through armored fiber optic (10) and demarcation unit (3), high reflection mirror (12) is furnished with in the chamber of demarcation unit (3), the full impregnated total reflective mirror (16) of output terminal in constrained port (15) with laser pick-off unit (2) chamber of high reflection mirror (12) connects, in laser pick-off unit (2) chamber, both sides seal respectively and install high transmission eyeglass formation demarcation air chamber (22), the output terminal of full impregnated total reflective mirror (16) connects with photodetector (19) through demarcating air chamber (22), nitrogen gas supply pipeline (25) accesses to the chamber of laser emission element (1) respectively, demarcate the chamber of unit (3) and demarcate air chamber (22).
2. the original position caliberating device of pipeline gas on-line checkingi according to claim 1, is characterized in that: described Distributed Feedback Laser (5) is that distributed feedback tail optical fiber exports semiconductor laser with tunable.
3. the original position caliberating device of pipeline gas on-line checkingi according to claim 1, it is characterized in that: described high reflection mirror (12) is level crossing, be connected with the set screw (14) controlling front and back position by the fine tuning bolt (13) controlling the angle of pitch.
4. the original position caliberating device of pipeline gas on-line checkingi according to claim 1, is characterized in that: described constrained port (15) has two.
5. the original position caliberating device of pipeline gas on-line checkingi according to claim 1, is characterized in that: the eyeglass that described full impregnated total reflective mirror (16) is double-sided coating, and one side is full impregnated, and one side is for being all-trans.
6. the original position caliberating device of pipeline gas on-line checkingi according to claim 1, is characterized in that: described laser pick-off unit (2) chamber is provided with and demarcates the air intake valve (23) and valve of giving vent to anger (24) that air chamber (22) communicates.
7. the original position caliberating device of pipeline gas on-line checkingi according to claim 1, is characterized in that: described high transmission eyeglass is non-parallel installation, and its angle of inclination is 5 degree.
8. the original position caliberating device of pipeline gas on-line checkingi according to claim 1, is characterized in that: the chamber of described laser emission element (1) is provided with window (8), and window (8) is level crossing structure.
9. the original position caliberating device of pipeline gas on-line checkingi according to claim 1, is characterized in that: the chamber of described laser pick-off unit (2) is provided with window (18), and window (18) is level crossing structure.
10. utilize device described in claim 1 to realize the original position scaling method of pipeline gas on-line checkingi, it is characterized in that: when being operated in measuring channel gas concentration situation, laser emission element (1) controls one-to-two photoswitch (6) and switches to optical path A, make the optical path of laser through one-to-two photoswitch (6) of Distributed Feedback Laser (5), collimated light beam C after collimation is after the gas absorption to be measured in piping, received by the photodetector (19) of laser pick-off unit (2), lock-in amplifier and the signal processing module of signal feeding laser pick-off unit (2) after opto-electronic conversion carry out retrieving concentration process, when needs carry out timing signal to detection system, control one-to-two photoswitch (6) and switch to demarcation light path B, by armored fiber optic (10), laser beam is introduced into demarcation unit (3), by high reflection mirror (12), laser beam D is beaten on the center of full impregnated total reflective mirror (16) to guarantee that laser beam D and collimated light beam C is through same path simultaneously afterwards through two constrained ports (15), light beam after full impregnated total reflective mirror (16) reflection is received by photodetector (19) through demarcation air chamber (22), lock-in amplifier and the signal processing module of signal feeding laser pick-off unit (2) after opto-electronic conversion carry out Signal acquiring and processing, calibration process is: first, in demarcation air chamber (22), be filled with high pure nitrogen and reach evenly, record it for background signal, and then to demarcating the gas to be measured that is filled with high concentration in air chamber (22) and reaching the high concentration signal gathered evenly now, after high concentration signal obtains, subtract each other with the background signal gathered before the demarcation signal being and will obtaining.
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Cited By (6)
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| CN105259137A (en) * | 2015-11-04 | 2016-01-20 | 安徽中科智泰光电测控科技有限公司 | Automatic absorption spectrum online in-situ measuring device for laser ammonia escape of pipeline |
| 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 |
| CN112485200A (en) * | 2020-11-27 | 2021-03-12 | 西南石油大学 | Modularization well head foam content detection device |
| CN112730178A (en) * | 2020-12-22 | 2021-04-30 | 杭州春来科技有限公司 | Vehicle-mounted transmission-type smoke meter and vehicle |
| CN112946539A (en) * | 2021-01-04 | 2021-06-11 | 北京航空航天大学 | Single-beam reflection type triaxial magnetic field measuring device based on SERF |
| CN116275476A (en) * | 2023-05-10 | 2023-06-23 | 安徽中科光仪科技有限公司 | Active alignment method and device for laser light path |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105259137A (en) * | 2015-11-04 | 2016-01-20 | 安徽中科智泰光电测控科技有限公司 | Automatic absorption spectrum online in-situ measuring device for laser ammonia escape of pipeline |
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| CN112485200A (en) * | 2020-11-27 | 2021-03-12 | 西南石油大学 | Modularization well head foam content detection device |
| CN112730178A (en) * | 2020-12-22 | 2021-04-30 | 杭州春来科技有限公司 | Vehicle-mounted transmission-type smoke meter and vehicle |
| CN112946539A (en) * | 2021-01-04 | 2021-06-11 | 北京航空航天大学 | Single-beam reflection type triaxial magnetic field measuring device based on SERF |
| CN112946539B (en) * | 2021-01-04 | 2023-09-01 | 北京航空航天大学 | Single-beam reflection type triaxial magnetic field measuring device based on SERF |
| CN116275476A (en) * | 2023-05-10 | 2023-06-23 | 安徽中科光仪科技有限公司 | Active alignment method and device for laser light path |
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| CN104266971B (en) | 2016-06-22 |
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