CN103630523A - Laser induction spectrum generating device used for water quality optical analyzer - Google Patents
Laser induction spectrum generating device used for water quality optical analyzer Download PDFInfo
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- CN103630523A CN103630523A CN201210297382.XA CN201210297382A CN103630523A CN 103630523 A CN103630523 A CN 103630523A CN 201210297382 A CN201210297382 A CN 201210297382A CN 103630523 A CN103630523 A CN 103630523A
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Abstract
The invention discloses a laser induction spectrum generating device used for a water quality optical analyzer detecting organic matter comprehensive indexes of water. The device comprises a TLD light source 1, optical fibers 2, an incidence optical window 3, a sample cell 4, a transmitted light detection optical window 5, a fluorescence detection optical window 6, a double-channel spectrometer 7 and a data processing and controlling calculation unit 8. A monolithic integration tunable semiconductor laser is employed by the TLD light source 1, under the synchronous control of the data processing and controlling calculation unit 8, monochromatic light with different wavelength is output by the TLD light source 1 at UV/Vis wave bands, an irradiated sample generates transmitted light and fluorescence, the transmitted light and the fluorescence are subjected to photoelectric conversion by the double-channel spectrometer 7, then are sent to the data processing and controlling calculation unit 8, and UV/Vis absorption spectrum, Raman scattered spectrum and high dimensional fluorescence spectrum are generated. The laser induction spectrum generating device is simple in structure, and spectrum characteristics of various organic components in the sample can be fully excited, thereby facilitating the improvement of organic matter comprehensive index detection precision of the sample.
Description
Technical field
The present invention relates to a kind of spectrum generating apparatus, particularly a kind of sample induced with laser spectrum generating apparatus of the water quality optical analysis instrument for detection of water body organism composite target.
Background technology
Described water quality optical analysis instrument is widely used in detecting the organism composite target value (as COD, BOD, TOC, CODmn etc.) of water body, its working mechanism is while utilizing the continuous spectrum light beam irradiates water body of ultraviolet/visible (UV/Vis) wave band (200-800nm), its energy can be by the principle of wherein various organic molecule selectivity absorption, scattering or fluorescence excitation, by measuring UV absorption spectrum intensity or the fluorescence emission spectral intensity of water sample, then obtain the measured value of organism composite target in water sample by calculated with mathematical model.In the measurement mechanism of this principle of work, except the physical optics checkout equipments such as light source, light sensor, water sample sampling device and embedded computer data processing unit, all chemical reaction processes have been got rid of, therefore no longer need any chemical reaction equipment, thereby from performance, overcome a series of defects of traditional hydrochemistry analysis meter, be specially adapted to unattended online water analysis on a large scale, environmental pollution monitoring.Chinese invention patent application CN101275905 < < multi-source optical spectrum syncretizing portable water quality analysis meter > > has provided a representative instance of this type of water quality optical analysis instrument.
But existing spectrum generation technique directly utilizes the light source (as deuterium tungsten lamp) that produces UV/Vis continuous spectrum to irradiate sample conventionally, and by spectrometer, transmitted light is converted to absorption spectrum; Or utilize single wavelength laser light source (as semiconductor laser) excited sample, then by spectrometer, convert the fluorescence of sample transmitting to fluorescence emission spectrum.The sample spectra that adopts said method to generate is the one dimension spectrum of describing relation (for fluorescence emission spectrum) between the relation (for UV/Vis absorption spectrum) between light intensity and light source illumination wavelength of absorbing or description fluorescent emission light intensity and fluorescent emission wavelength, resolving ability to various organic components in sample is poor, makes the detection error of water body organism composite target value larger.And generate above-mentioned two class spectrum and need adopt different light sources, increased the complicacy of Water Test Kits list structure.
In fact, in described water quality optical analysis instrument, utilize the light source of different wave length irradiate sample excitation fluorescence and obtain its fluorescence emission spectrum, the higher-dimension fluorescence spectrum of relation between fluorescent emission light intensity and excitation source wavelength and fluorescent emission wavelength finally generate to be described, for composition and the content of various compounds in abundant announcement sample, the accuracy of detection of the organism composite target of increasing water quality is significant.At present in fluorescence analysis field, the device that generates higher-dimension fluorescence spectrum is mainly fluorospectrophotometer, the light source (as xenon arc lamp) that employing can produce continuous spectrum filters out a series of monochromatic excitation irradiation samples through scanning excitation monochromator, then convert the fluorescence of sample transmitting to fluorescence emission spectrum successively, the different wave length of associating excitation source forms higher-dimension fluorescence spectrum.Conventionally because the fluorescent emissive porwer obtaining is extremely faint, except need are used powerful light source, when obtaining the fluorescence emission spectrum of sample, also need to use transmitting monochromator and photomultiplier, further increased the complicacy of device and the measuring error of instrument.For this problem, Chinese invention patent application CN101275905 has provided the higher-dimension fluorescence spectrum generating apparatus that a kind of numerical control multi-wavelength integration laser of take a plurality of minature solide-state laers and semiconductor laser composition is light source, by a series of monochromatic excitation light of laser instrument switching generation of computer control different wave length.But this device will be used a plurality of laser instruments, complex structure, cost is high, and the excitation wavelength of output is subject to the materials limitations of each laser instrument, be difficult in the bandwidth range of needs, be evenly distributed in different excitation wavelengths, can not obtain desirable higher-dimension fluorescence spectrum, thus the precision of the analysis meter that is unfavorable for increasing water quality.In addition, use technique scheme can only generate the fluorescence spectrum of sample, as need generate UV/Vis absorption spectrum, still need to adopt other light sources.
Summary of the invention
The object of the invention is problem complicated for prior art device structure when generating water sample higher-dimension spectrum, excitation source limited wavelength, and a kind of new water quality optical analysis instrument laser-induced optical spectrum generating apparatus is provided.Be characterized in adopting single wavelengthtunable LASER Light Source can obtain the UV/Vis absorption spectrum of analyzed sample, raman scattering spectrum and higher-dimension fluorescence spectrum simultaneously, and excitation wavelength is uniformly distributed in the bandwidth range of needs, the spectral characteristic of various organic components in sample is fully encouraged, can significantly improve the accuracy of detection of sample organism composite target value.
Key equipment of the present invention is semiconductor laser with tunable (TLD).TLD can continuously change the laser instrument of laser output wavelength within the specific limits, by thermal tuning, mechanical tuning or carrier injection, directly or indirectly change the optical length of laser resonant cavity, realize optical maser wavelength tuning, then carry out chamber mould aligning and wavelength is exported by wavelength selection unit, phase adjustment unit.TLD is widely used in broadband light communication system and structure of matter analysis, in fields such as atmosphere environment supervision, fuel gas temperature measurements, also has a small amount of application example.But in these application, conventionally adopt the TLD light source of visible and infrared band, the application in spectral analysis field adopts absorption spectrum conventionally.The present invention adopts TLD light source in UV/Vis wavelength band, to generate sample absorption spectrum and higher-dimension fluorescence spectrum first simultaneously, for water body organism analysis.
Technical scheme of the present invention is: the excitation source that adopts broadband TLD to generate as sample spectra, the beam incident optical window that is connected to sample cell by optical fiber irradiates sample, at sample cell and incident light is in 90 ° and 180 ° of angle positions arrange respectively transmitted light and fluorescence detection optical window, by optical fiber, be connected to binary channels planar array type charge coupled cell (CCD) high sensitivity spectrometer and generate required sample spectra.The operation of excitation source and spectrometer realizes synchro control by a data processing and control computing unit.
During the work of multidimensional spectrum generating apparatus, data processing starts TLD light source with control computing unit, and in UV/Vis wavelength band the output wavelength of continuous tuning laser instrument from low to high, by beam incident optical window, irradiate sample successively, and the light signal input port of synchro control double-channel spectrometer, from transmitted light, survey transmitted light intensity and the Raman diffused light/fluorescent intensity signal that optical window and fluorescence detection optical window obtain sample under each incident wavelength laser excitation respectively, then through data processing and control computing unit, carry out data processing, generate the absorption spectrum of sample in required wavelength band, raman scattering spectrum and higher-dimension fluorescence emission spectrum, wherein each output wavelength of TLD light source is corresponding to a corresponding wavelength of sample absorption spectrum, and complete sample raman scattering spectrum and a fluorescence emission spectrum.
In the present invention owing to having adopted single TLD light source, and in UV/Vis wavelength band the output wavelength of continuous tuning laser instrument, therefore whole device simple for structure, fully encouraged the absorption spectrum of various organic components, raman scattering spectrum and Fluorescence Characteristic in sample, can significantly improve the accuracy of detection of sample organism composite target value.
Accompanying drawing explanation
Fig. 1 is water quality optical analyser higher-dimension spectrum generating apparatus structural representation.
Embodiment
As shown in Figure 1, for detection of a sample higher-dimension spectrum generating apparatus for the water quality optical analysis instrument of water body organism composite target, by TLD light source 1, optical fiber 2, beam incident optical window 3, sample cell 4, transmitted light, survey optical window 5, fluorescence detection optical window 6, double-channel spectrometer 7 and data processing and control computing unit 8 forms.TLD light source 1 is connected to the beam incident optical window 3 of sample cell 4 by optical fiber 2, and the transmitted light of sample cell 4 is surveyed optical window 5 and fluorescence detection optical window 6 is connected to respectively UV/Vis absorption spectrum measurement passage and Raman scattering/fluorescence emission spectrum passage of double-channel spectrometer 7 by optical fiber 2.Data processing is connected with the control signal input end of TLD light source 1 and double-channel spectrometer 7 respectively by signal cable 9 with the synchronous control signal output terminal of controlling computing unit 8, and data processing is connected with the spectral signal output terminal of double-channel spectrometer 7 by signal cable 9 with the spectral signal input end of controlling computing unit 8.
Beam incident optical window 3 is with collimation lens set 10.
Transmitted light is surveyed optical window 5 with collimation lens set 11, and its axis and beam incident optical window 3 axis angles are 180 °.
Fluorescence detection optical window 6 is with focus lens group 12, and its axis and beam incident optical window 3 axis angles are 90 °.
Double-channel spectrometer 7 adopts planar array type thermoelectric cooling back lighting type CCD high sensitivity spectrometer.
Data processing is an embedded computer with controlling computing unit 8, with data processing and control application software.
Data processing is switched the output wavelength of TLD light source 1 with speed ascending sequential control within the scope of the tunable wavelength of TLD light source 1 of 10Hz with control computing unit 8, and corresponding to each output wavelength synchro control double-channel spectrometer 7, from transmitted light, survey the spectral information that optical window 5 and fluorescence detection optical window 6 obtain sample successively, after opto-electronic conversion, send into data processing and control computing unit 8, carry out generating after data processing the UV/Vis absorption spectrum of sample, raman scattering spectrum and higher-dimension fluorescence emission spectrum, organism composite target for sample is analyzed.
Claims (4)
1. the induced with laser spectrum generating apparatus for detection of the water quality optical analysis instrument of water body organism composite target, by TLD light source 1, optical fiber 2, beam incident optical window 3, sample cell 4, transmitted light is surveyed optical window 5, fluorescence detection optical window 6, double-channel spectrometer 7 and data processing and control computing unit 8 form, it is characterized in that TLD light source 1 is connected to the beam incident optical window 3 of sample cell 4 by optical fiber 2, and the transmitted light of sample cell 4 is surveyed optical window 5 and fluorescence detection optical window 6 is connected to respectively UV/Vis absorption spectrum measurement passage and the fluorescence emission spectrum passage of double-channel spectrometer 7 by optical fiber 2, data processing is connected with the control signal input end of TLD light source 1 and double-channel spectrometer 7 respectively by signal cable 9 with the synchronous control signal output terminal of controlling computing unit 8, data processing is connected with the spectral signal output terminal of double-channel spectrometer 7 by signal cable 9 with the spectral signal input end of controlling computing unit 8.
2. the induced with laser spectrum generating apparatus of the water quality optical analysis instrument for detection of water body organism composite target according to claim 1, it is characterized in that TLD light source 1 adopts bandwidth range to be not less than ［ 370nm, 800nm ］ monolithic integrated tunable semiconductor laser, output power is not less than 60mw, and wavelength switching rate is not less than 1KHz.
3. the induced with laser spectrum generating apparatus of the water quality optical analysis instrument for detection of water body organism composite target according to claim 1, it is characterized in that beam incident optical window 3 is with collimation lens set 10, transmitted light is surveyed optical window 5 with collimation lens set 11, its axis and beam incident optical window 3 axis angles are 180 °, for obtaining the UV/Vis absorption spectrum of sample; Fluorescence detection optical window 6 is with collimation lens set 12, and its axis and beam incident optical window 3 axis angles are 90 °, for obtaining raman scattering spectrum and the higher-dimension fluorescence emission spectrum of sample.
4. the induced with laser spectrum generating apparatus of the water quality optical analysis instrument for detection of water body organism composite target according to claim 1, it is characterized in that data processing and control computing unit 8 within the scope of the tunable wavelength of TLD light source 1, the output wavelength of TLD light source 1 is switched in ascending sequential control, and corresponding to each output wavelength synchro control double-channel spectrometer 7, from transmitted light, survey the spectral information that optical window 5 and fluorescence detection optical window 6 obtain sample successively, after opto-electronic conversion, send into data processing and control computing unit 8, calculate the UV/Vis absorption spectrum of rear generation sample, raman scattering spectrum and higher-dimension fluorescence emission spectrum, organism composite target for sample is analyzed.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198388A (en) * | 2014-09-15 | 2014-12-10 | 中国科学院烟台海岸带研究所 | Online water quality monitoring device based on composite spectrum measurement |
| CN104596991A (en) * | 2014-12-25 | 2015-05-06 | 北京农业智能装备技术研究中心 | Detection device for water body turbidity |
| CN104865191A (en) * | 2015-06-15 | 2015-08-26 | 武汉大学 | Double-channel self-checking system and method for water body apparent spectrum observation |
| CN105424634A (en) * | 2015-10-29 | 2016-03-23 | 中国计量学院 | Water quality COD detector based on optical fiber coupling ultraviolet light source and prediction model optimization system of water quality COD detector |
| WO2016069279A1 (en) | 2014-10-29 | 2016-05-06 | Horiba Instruments Incorporated | Determination of water treatment parameters based on absorbance and fluorescence |
| CN105823734A (en) * | 2016-04-18 | 2016-08-03 | 苏州镭旭光电科技有限公司 | Portable soil quality and water quality detecting equipment |
| CN107631983A (en) * | 2017-10-23 | 2018-01-26 | 杭州希玛诺光电技术股份有限公司 | A kind of multispectral parallel generation device of sample for water analysis |
| CN109164080A (en) * | 2018-09-29 | 2019-01-08 | 江苏瑞明生物科技有限公司 | Suitable for the lossless fluorescence detection spectrometer of cellular level |
| CN109187445A (en) * | 2018-10-24 | 2019-01-11 | 中国科学院新疆理化技术研究所 | A kind of method for avoiding excitation laser harmonic wave from influencing in luminescence generated by light test |
| CN109342344A (en) * | 2018-11-30 | 2019-02-15 | 南京工程学院 | A kind of the non-calibrating device and its measuring method of mercury analyzer |
| CN109520983A (en) * | 2018-11-20 | 2019-03-26 | 山东船舶技术研究院 | A kind of quality evaluation method and device based on DOM |
| CN111272639A (en) * | 2020-02-28 | 2020-06-12 | 清华大学深圳国际研究生院 | Fluorescent particle detection device and method |
| CN112400105A (en) * | 2018-07-13 | 2021-02-23 | 光谱创新公司 | Device for analysing cereals by infrared spectroscopy and fluorescence spectroscopy |
| CN114166747A (en) * | 2021-11-29 | 2022-03-11 | 浙江大学 | Discrete three-dimensional fluorescence/visible light absorption spectrum detection device for distinguishing water pollution |
| CN114460055A (en) * | 2022-02-14 | 2022-05-10 | 上海交通大学 | Method and device for monitoring COD (chemical oxygen demand) by using clustering-regression-based spectroscopy |
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| CN101719629A (en) * | 2009-12-09 | 2010-06-02 | 中国科学院半导体研究所 | Blazed grating external cavity semiconductor laser and collimating method thereof |
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Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198388A (en) * | 2014-09-15 | 2014-12-10 | 中国科学院烟台海岸带研究所 | Online water quality monitoring device based on composite spectrum measurement |
| CN104198388B (en) * | 2014-09-15 | 2017-05-10 | 中国科学院烟台海岸带研究所 | Online water quality monitoring device based on composite spectrum measurement |
| EP3213055A4 (en) * | 2014-10-29 | 2018-12-05 | Horiba Instruments Incorporated | Determination of water treatment parameters based on absorbance and fluorescence |
| WO2016069279A1 (en) | 2014-10-29 | 2016-05-06 | Horiba Instruments Incorporated | Determination of water treatment parameters based on absorbance and fluorescence |
| US10184892B2 (en) | 2014-10-29 | 2019-01-22 | Horiba Instruments Incorporated | Determination of water treatment parameters based on absorbance and fluorescence |
| CN104596991A (en) * | 2014-12-25 | 2015-05-06 | 北京农业智能装备技术研究中心 | Detection device for water body turbidity |
| CN104596991B (en) * | 2014-12-25 | 2017-10-31 | 北京农业智能装备技术研究中心 | A kind of turbidity detection means |
| CN104865191A (en) * | 2015-06-15 | 2015-08-26 | 武汉大学 | Double-channel self-checking system and method for water body apparent spectrum observation |
| CN104865191B (en) * | 2015-06-15 | 2017-05-03 | 武汉大学 | Double-channel self-checking system and method for water body apparent spectrum observation |
| CN105424634A (en) * | 2015-10-29 | 2016-03-23 | 中国计量学院 | Water quality COD detector based on optical fiber coupling ultraviolet light source and prediction model optimization system of water quality COD detector |
| CN105823734A (en) * | 2016-04-18 | 2016-08-03 | 苏州镭旭光电科技有限公司 | Portable soil quality and water quality detecting equipment |
| CN107631983A (en) * | 2017-10-23 | 2018-01-26 | 杭州希玛诺光电技术股份有限公司 | A kind of multispectral parallel generation device of sample for water analysis |
| CN112400105A (en) * | 2018-07-13 | 2021-02-23 | 光谱创新公司 | Device for analysing cereals by infrared spectroscopy and fluorescence spectroscopy |
| CN109164080A (en) * | 2018-09-29 | 2019-01-08 | 江苏瑞明生物科技有限公司 | Suitable for the lossless fluorescence detection spectrometer of cellular level |
| CN109187445A (en) * | 2018-10-24 | 2019-01-11 | 中国科学院新疆理化技术研究所 | A kind of method for avoiding excitation laser harmonic wave from influencing in luminescence generated by light test |
| CN109520983A (en) * | 2018-11-20 | 2019-03-26 | 山东船舶技术研究院 | A kind of quality evaluation method and device based on DOM |
| CN109520983B (en) * | 2018-11-20 | 2021-02-12 | 山东船舶技术研究院 | DOM-based water quality evaluation method and device |
| CN109342344A (en) * | 2018-11-30 | 2019-02-15 | 南京工程学院 | A kind of the non-calibrating device and its measuring method of mercury analyzer |
| CN109342344B (en) * | 2018-11-30 | 2021-02-02 | 南京工程学院 | Calibration-free device of mercury analyzer and determination method thereof |
| CN111272639A (en) * | 2020-02-28 | 2020-06-12 | 清华大学深圳国际研究生院 | Fluorescent particle detection device and method |
| CN114166747A (en) * | 2021-11-29 | 2022-03-11 | 浙江大学 | Discrete three-dimensional fluorescence/visible light absorption spectrum detection device for distinguishing water pollution |
| CN114166747B (en) * | 2021-11-29 | 2023-12-15 | 浙江大学 | Discrete three-dimensional fluorescence/visible light absorption spectrum detection device for distinguishing water pollution |
| CN114460055A (en) * | 2022-02-14 | 2022-05-10 | 上海交通大学 | Method and device for monitoring COD (chemical oxygen demand) by using clustering-regression-based spectroscopy |
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Application publication date: 20140312 |