CN1773257A - Water body pollution laser induction fluorescence remote-measuring method - Google Patents
Water body pollution laser induction fluorescence remote-measuring method Download PDFInfo
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- CN1773257A CN1773257A CN 200510095336 CN200510095336A CN1773257A CN 1773257 A CN1773257 A CN 1773257A CN 200510095336 CN200510095336 CN 200510095336 CN 200510095336 A CN200510095336 A CN 200510095336A CN 1773257 A CN1773257 A CN 1773257A
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Abstract
The present invention discloses a laser induced fluorescence remote measuring method for water body pollution. It is characterized by that the equipment for implementing said method includes the following several components: Nd:YAG laser, receiving telescope, several fibre bundles, optical filters, photoelectric multiplier and gating device, etc. Said invention also provides the concrete connection mode of all the above-mentioned components and the working principle of said remote measuring method.
Description
Technical field
The invention belongs to the laser measurement field, specifically is the method that a kind of Ultra-Violet Laser induced fluorescence is measured water pollution.
Background technology
Can send fluorescence when material is subjected to rayed, different materials has its specific fluorescence spectral characteristic.Fluorescence spectral characteristic can be differentiated the kind and the concentration of the material that is excited.Utilize this principle, can realize the remote measurement of water pollution.
Prior art Ultra-Violet Laser induced fluorescence is measured the method for water pollution, is the frequency tripling 355nm wavelength exciting light that adopts the Nd:YAG laser instrument, and pulse repetition rate is 10Hz.Receive the back scattering fluorescence signal of water body by the Cassegrain telescope, emission receives adopts coaxial manner, after optical fiber is coupled into monochromator, be converted to electric signal and send PC to carry out data processing, obtain the fluorescence spectrum signal by the data collecting card collection by photomultiplier (PMT).The distance of fluorescence signal and excitating light strength, tested pollutant concentration, exciting light and measured matter, ambient light intensity etc. are relevant, in order to realize the tested pollutant concentration of quantitative test, need to eliminate the influence of ambient light intensity variation, excitating light strength variation and factors such as exciting light and measured matter variable in distance to fluorescence intensity.Wherein influence factors such as excitating light strength, exciting light and measured matter variable in distance are solved preferably by using measured matter Raman signal intensity normalization fluorescence signal.The variation of ambient light intensity is not well solved to the influence of fluorescence intensity in telemetry system, and existing measuring system can only be carried out or in system the water sampling part is housed indoor.Can not satisfy the requirement of outdoor remote measurement.
Summary of the invention
The objective of the invention is for solve above-mentioned water pollution measure in ambient light intensity change influence to fluorescence intensity.In the laser-induced fluorescence (LIF) measuring system, adopt photomultiplier to survey fluorescence signal usually, owing to adopt pulse laser to excite, so fluorescence signal also is pulse, just exists in the very short time.Therefore, in opto-electronic conversion, adopt the time gate technology can effectively reduce the influence of the surround lighting except that fluorescence signal, improve the precision that fluorescence signal is surveyed.The hyperchannel gate photomultiplier that adopts in the time resolution optical signalling detects is complex structure not only, and costs an arm and a leg.Content of the present invention is to propose a kind of new controlled quick PMT gate high pressure implementation method time delay, uses conventional photomultiplier to realize the accurate detection of pulse fluorescence signal in the fluorescence signal detection system.
The objective of the invention is to propose a kind of new controlled quick gate high pressure implementation method time delay, not only be used to control the opto-electronic conversion that conventional photomultiplier transit tube anode is realized the pulse fluorescence signal, and be used to control the gate integration of multiplier tube output current.
Water body pollution laser induction fluorescence remote-measuring method, it is characterized in that obtaining the excitation light pulse of 355nm by Nd:YAG laser instrument frequency tripling, by the transmitter-telescope beam-expanding collimation, shine the surface of measured object polluted-water, the fluorescence that measured object inspires is received by receiving telescope, at the light-emitting window focus place of receiving telescope multiple beams of optical fiber is installed, and the optical filter of different-waveband is installed respectively at the output terminal of optical fiber, one of them is the optical filter of 405nm, is used to detect the wherein Raman signal of a branch of light; All the other optical filters are chosen according to measuring fluorescent characteristics; Photomultiplier is installed behind the optical filter, converts fluorescence signal to corresponding electric signal, photomultiplier is triggered by gating device; During measurement, open the Q-switch of laser instrument, the pulse signal of its output is as the synchronizing signal of system, and laser instrument sends pulse laser simultaneously, keeps the gate high-voltage pulse generation circuit of gating device to be in closed condition; The gate high-voltage pulse of transferring Q signal to trigger gating device simultaneously produces circuit, produces two high-voltage pulses that width is identical, time interval is several microseconds and opens photomultiplier, and first high-voltage pulse is opened photomultiplier and received fluorescence signal; Second high-voltage pulse opened photomultiplier reception environment bias light signal, and the current signal of photomultiplier output is input to the time gate current integration circuit and finishes the current/voltage conversion; Make photomultiplier just after exciting light, finish the current conversion of fluorescence signal and the current conversion of ambient light signal in the time very shortly.
Light hurdle and beam collimation device are installed before the described fibre bundle.
Principal feature of the present invention is: 1, adjustable quick high-pressure pulsed triggering circuit of duration of pulse; 2, time gate integrator; 3, the bias light signal in the fluorescence signal is removed in the detection of gate photomultiplier and environmental background light signal effectively; 4, detect Raman signal and fluorescent characteristics signal the time.
The invention solves outdoor laser induced fluorescence remote signal detection and be subjected to the problem that influences that ambient light intensity changes.For utilizing laser-induced fluorescence (LIF) signal quantitative inversion pollutant levels that reliable raw data is provided.
Description of drawings
Fig. 1 is a principle of the invention block diagram.
Embodiment
Referring to Fig. 1.Number in the figure:
1, laser source system
2, beam reflection system
3, beam-expanding system
4, reception/transmitter-telescope
5, Guang Lan
6, beam collimation device
7, fibre bundle
8, optical filter
9, photomultiplier
10, photomultiplier high-voltage power supply and gating device
11, time gate current integration circuit
12, be control, acquisition process and display system
Device feature as can be seen from the figure of the present invention constitutes.
Water body pollution laser induction fluorescence remote-measuring method, it is the excitation light pulse that obtains 355nm by Nd:YAG laser instrument frequency tripling, by the transmitter-telescope beam-expanding collimation, shine measured object---the surface of contaminated water body, the fluorescence that water body inspires is received by receiving telescope, at the light-emitting window focus place of receiving telescope three beams bundle optical fiber is installed, the optical filter of three different-wavebands is installed respectively at the output terminal of optical fiber, one of them is the optical filter of 405nm, be used to detect the wherein Raman signal of a branch of light; All the other optical filters are chosen according to measuring fluorescent characteristics; A photomultiplier is installed behind each optical filter, converts fluorescence signal to corresponding electric signal, photomultiplier is triggered by gating device; During measurement, open the Q-switch of laser instrument, the pulse signal of its output is as the synchronizing signal of system, and laser instrument sends pulse laser, keeps the gate high-voltage pulse of gating device to be in closed condition; The high-voltage pulse of transferring Q signal to trigger the gating device on the photomultiplier simultaneously produces circuit, produce two width high-voltage pulses identical, several microseconds of the time interval and open photomultiplier, receive fluorescence signal and environmental background light signal respectively, the three-beam signal is input to three time gate current integration circuit respectively; Make photomultiplier just in gating pulse, carry out the current conversion of light signal.
First high-voltage pulse is opened photomultiplier and is received fluorescence signal; Second high-voltage pulse opened photomultiplier reception environment bias light signal, and the current signal of photomultiplier output is input to the time gate current integration circuit and finishes the current/voltage conversion; Make photomultiplier just after exciting light, finish the current conversion of fluorescence signal and the current conversion of ambient light signal in the time very shortly.
Light hurdle and beam collimation device are installed before the described fibre bundle.
Claims (2)
1, water body pollution laser induction fluorescence remote-measuring method, it is characterized in that obtaining the excitation light pulse of 355nm by Nd:YAG laser instrument frequency tripling, by the transmitter-telescope beam-expanding collimation, shine the surface of measured object polluted-water, the fluorescence that measured object inspires is received by receiving telescope, multiple beams of optical fiber is installed at light-emitting window focus place at receiving telescope, the optical filter of different-waveband is installed respectively at the output terminal of optical fiber, one of them is the optical filter of 405nm, is used to detect the wherein Raman signal of a branch of light; All the other optical filters are chosen according to measuring fluorescent characteristics; Photomultiplier is installed behind the optical filter, converts fluorescence signal to corresponding electric signal, photomultiplier is triggered by gating device; During measurement, open the Q-switch of laser instrument, the pulse signal of its output is as the synchronizing signal of system, and laser instrument sends pulse laser simultaneously, keeps the gate high-voltage pulse generation circuit of gating device to be in closed condition; The gate high-voltage pulse of transferring Q signal to trigger gating device simultaneously produces circuit, produces two high-voltage pulses that width is identical, time interval is several microseconds and opens photomultiplier, and first high-voltage pulse is opened photomultiplier and received fluorescence signal; Second high-voltage pulse opened photomultiplier reception environment bias light signal, and the current signal of photomultiplier output is input to the time gate current integration circuit and finishes the current/voltage conversion; Make photomultiplier just after exciting light, finish the current conversion of fluorescence signal and the current conversion of ambient light signal in the time very shortly.
2, method according to claim 1 is characterized in that before the described fibre bundle light hurdle and beam collimation device being installed.
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| CN200510095336A CN100590422C (en) | 2005-11-06 | 2005-11-06 | Water body pollution laser induction fluorescence remote-measuring method |
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| CN200510095336A CN100590422C (en) | 2005-11-06 | 2005-11-06 | Water body pollution laser induction fluorescence remote-measuring method |
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| CN1773257A true CN1773257A (en) | 2006-05-17 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100510714C (en) * | 2006-12-05 | 2009-07-08 | 中国科学院安徽光学精密机械研究所 | Laser breakdown spectrographic detection method and system for metal pollutants in water body |
| CN102128799A (en) * | 2010-12-21 | 2011-07-20 | 无锡荣兴科技有限公司 | Water quality detection sensor |
| CN102455291A (en) * | 2010-10-20 | 2012-05-16 | 纳尔科公司 | Pollution detection method using fluorescent technique |
| CN105004824A (en) * | 2015-08-18 | 2015-10-28 | 宁波海尔施基因科技有限公司 | Optical fiber combination device for capillary electrophoresis apparatus |
| CN105067522A (en) * | 2015-08-05 | 2015-11-18 | 宁波工程学院 | Quasi real-time photomultiplier background deduction device and method |
| CN105223177A (en) * | 2015-10-19 | 2016-01-06 | 青岛市光电工程技术研究院 | A kind of distance self-adaptation marine oil spill monitoring equipment and method |
| CN106770181A (en) * | 2017-02-24 | 2017-05-31 | 天津大学 | A kind of multifocal point type Raman spectrum Acquisition Instrument based on diffraction optical element |
| CN108956560A (en) * | 2018-06-05 | 2018-12-07 | 北京目黑科技有限公司 | A kind of fluorescent material detection device and method |
| CN110793887A (en) * | 2019-11-20 | 2020-02-14 | 华南理工大学 | Synchronous fluorescence detection device for interface concentration of fluorescent pollutants and use method thereof |
| CN112129739A (en) * | 2020-09-27 | 2020-12-25 | 山东省科学院激光研究所 | Sensing device based on optical fiber surface enhanced Raman probe and working method |
| CN112147094A (en) * | 2020-09-07 | 2020-12-29 | 桂林电子科技大学 | Balanced type optical fiber array biochemical spectrum light splitting device |
| CN114152583A (en) * | 2020-09-07 | 2022-03-08 | 桂林电子科技大学 | Multi-optical-fiber two-dimensional spectrum analysis device based on CCD detection |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101957320B (en) * | 2010-08-11 | 2012-07-11 | 中国科学院安徽光学精密机械研究所 | Portable optical mechanical system of underwater in-situ luminoscope |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1167945C (en) * | 2001-08-07 | 2004-09-22 | 中国科学院大连化学物理研究所 | Laser induced fluorescence detector |
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2005
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100510714C (en) * | 2006-12-05 | 2009-07-08 | 中国科学院安徽光学精密机械研究所 | Laser breakdown spectrographic detection method and system for metal pollutants in water body |
| CN102455291B (en) * | 2010-10-20 | 2017-04-12 | 纳尔科公司 | Pollution detection method using fluorescent technique |
| CN102455291A (en) * | 2010-10-20 | 2012-05-16 | 纳尔科公司 | Pollution detection method using fluorescent technique |
| CN102128799A (en) * | 2010-12-21 | 2011-07-20 | 无锡荣兴科技有限公司 | Water quality detection sensor |
| CN105067522A (en) * | 2015-08-05 | 2015-11-18 | 宁波工程学院 | Quasi real-time photomultiplier background deduction device and method |
| CN105004824A (en) * | 2015-08-18 | 2015-10-28 | 宁波海尔施基因科技有限公司 | Optical fiber combination device for capillary electrophoresis apparatus |
| CN105223177A (en) * | 2015-10-19 | 2016-01-06 | 青岛市光电工程技术研究院 | A kind of distance self-adaptation marine oil spill monitoring equipment and method |
| CN106770181A (en) * | 2017-02-24 | 2017-05-31 | 天津大学 | A kind of multifocal point type Raman spectrum Acquisition Instrument based on diffraction optical element |
| CN108956560A (en) * | 2018-06-05 | 2018-12-07 | 北京目黑科技有限公司 | A kind of fluorescent material detection device and method |
| CN110793887A (en) * | 2019-11-20 | 2020-02-14 | 华南理工大学 | Synchronous fluorescence detection device for interface concentration of fluorescent pollutants and use method thereof |
| CN112147094A (en) * | 2020-09-07 | 2020-12-29 | 桂林电子科技大学 | Balanced type optical fiber array biochemical spectrum light splitting device |
| CN114152583A (en) * | 2020-09-07 | 2022-03-08 | 桂林电子科技大学 | Multi-optical-fiber two-dimensional spectrum analysis device based on CCD detection |
| CN112129739A (en) * | 2020-09-27 | 2020-12-25 | 山东省科学院激光研究所 | Sensing device based on optical fiber surface enhanced Raman probe and working method |
| CN112129739B (en) * | 2020-09-27 | 2024-03-19 | 山东省科学院激光研究所 | Sensing device based on optical fiber surface enhanced Raman probe and working method |
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| CN100590422C (en) | 2010-02-17 |
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