CN109520983A - A kind of quality evaluation method and device based on DOM - Google Patents
A kind of quality evaluation method and device based on DOM Download PDFInfo
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- CN109520983A CN109520983A CN201811385777.9A CN201811385777A CN109520983A CN 109520983 A CN109520983 A CN 109520983A CN 201811385777 A CN201811385777 A CN 201811385777A CN 109520983 A CN109520983 A CN 109520983A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
Abstract
The present invention discloses a kind of quality evaluation method and device based on DOM, computer controlled laser transmitting ultraviolet laser is incident on water sample to be measured, water sample to be measured generates scattered light signal and fluorescence signal, scattered light signal and fluorescence signal first filter through optical filter, it is divided again through grating splitting system, then photodetector surfaces are focused on by optical lens and is converted into electric signal transmission to computer progress data processing and obtain the curve of spectrum, Raman peak intensity, fluorescence peak intensity and the ambient noise spectral intensity in the curve of spectrum are obtained, according to water quality assessment formulaCalculate the D of the water sample to be measuredmValue.DOM content in water sample to be measured can be quickly evaluated and tested by the curve of spectrum, can help to understand and improve water quality in time with the real time measure water quality, there is directive significance to selection water quality；And the device uses miniature semiconductor laser and beam splitting system, and circuit board Highgrade integration, substantially reduces the device volume of Fluorescence Spectrometer, so that device is portable, is easy to use.
Description
Technical field
The present invention relates to field of water quality detection, more particularly to a kind of quality evaluation method and device based on DOM.
Background technique
Dissolved Organic Matter (Dissolved OrganicMatter, DOM) is a kind of height heterogeneous mixture, in ecology
It plays an important role in systematic procedure, mostly the degradation product and macromolecular compound of the decomposition of finger animals and plants remains, biological metabolism generation,
Account for its main component is humus, humic acid can by the effects of optical attenuation, nutrient availability and contaminant transportation to ecology
Health cause great influence, therefore can reflect the contaminated degree of water body using DOM, as one in water quality detection
Important indicator.
The concentration method measurement of traditional detection DOM is got up very time-consuming, and formality is also very many and diverse, cannot monitor the moment in time
The water quality of variation, with the development of spectral technique, a large amount of fluorescent technique is applied in water quality detection, its principle is to utilize certain
A little substances are in excitation state after ultraviolet light, what is occurred when transitting to ground state (deexcitation) from excitation state can reflect this
The fluorescence of substance characteristics, the method that qualitative or quantitative analysis can be carried out.Although these organic-matter chemical structures for constituting DOM are multiple
It is miscellaneous, it can not determine its molecular weight, but include the phenyl ring of aromatic compound in humic acid, or even further include by more than two benzene
The polycyclc aromatic compound that ring is constituted, this structure are measured for fluorescence analysis and lay a good foundation, in the prior art root
According to this feature, excitation wavelength 345nm, the spectrum of launch wavelength 425nm have been obtained, so that the concentration of humic acid has been measured, with
This overall target how many as organic matter relative amount in investigation water body.Later, many scholars are also by river, ocean and
The research of organic matter in waste water, it is determined that the relationship between fluorescence and organic matter.
The fluorescent method of common detection DOM concentration is three-dimensional fluorescence spectrum method at present, although three-dimensional fluorescence spectrum method precision
Height, but continuous change wavelength excitation light source is needed, time of measuring is long, and equipment volume is big, structure is complicated, and operating process is cumbersome.
Summary of the invention
The object of the present invention is to provide a kind of quality evaluation method and device based on DOM is realized and is evaluated and tested quickly, in real time
DOM content in water.
To achieve the above object, the present invention provides following schemes:
A kind of quality evaluation method based on DOM, which comprises
Control laser transmitting ultraviolet laser is incident to water sample to be measured, and the water sample to be measured is excited by the ultraviolet laser
Generate scattered light signal and fluorescence signal；
The scattered light signal and the fluorescence signal are first filtered, then are divided, the scattering after being divided
The fluorescence signal after optical signal and light splitting；
The scattered light signal after the light splitting and the fluorescence signal after the light splitting are gathered by optical lens
Coke is to photodetector surfaces and is converted to electric signal；
The scattering electric signal is obtained, and carries out data processing and obtains the curve of spectrum；
Raman peak intensity, fluorescence peak intensity and the ambient noise spectral intensity in the curve of spectrum are obtained, according to water quality
Judgement schematics calculate the D of the water sample to be measuredmValue, the water quality assessment formula are
Wherein, DmIndicate the content of Dissolved Organic Matter in water, IRRepresent the Raman peak intensity that water includes fluorescence background, IF
Water is represented in the fluorescence peak intensity of certain wavelength location, I0Indicate ambient noise spectral intensity.
A kind of water quality assessment system based on DOM, described device include: computer, laser, optical filter, grating beam splitting
System, optical lens and photodetector, the computer control the laser and emit ultraviolet laser, the ultraviolet laser
Be incident on water sample to be measured, the water sample to be measured generates scattered light signal and fluorescence signal, the scattered light signal with it is described glimmering
Optical signal first passes through the optical filter, then by the grating splitting system, the photoelectricity is focused on after the optical lens
On sensitive detection parts surface, the electric signal transmission of generation to the computer.
Optionally, the laser is semiconductor laser.
Optionally, for the water sample to be measured in test bottle, the test bottle is transparent.
Optionally, the optical axis of the ultraviolet laser optical path and the grating splitting system forms angle.
Optionally, the photodetector is using the face CCD or CMOS battle array or linear array detector.
The specific embodiment provided according to the present invention, the invention discloses following technical effects: the present invention is provided with and partly leads
Body laser can excite in water Dissolved Organic Matter to generate fluorescence, the laser signal of the scattering generated according to water sample to be measured and
Fluorescence signal can quickly judge water quality situation, and operating process simple possible, reached and quickly evaluated and tested in water in real time
The effect of DOM content.Meanwhile because the present invention uses miniature semiconductor laser and beam splitting system, and circuit board height collection
Cheng Hua substantially reduces the volume of Fluorescence Spectrometer device, so that device is portable, is easy to use.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the flow chart for the quality evaluation method based on DOM that the embodiment of the present invention 1 provides；
Fig. 2 is the water quality assessment schematic diagram for the quality evaluation method based on DOM that the embodiment of the present invention 1 provides；
Fig. 3 is the structure connection figure for the water quality assessment device based on DOM that the embodiment of the present invention 2 provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of quality evaluation method and device based on DOM, can evaluate and test real-time, quickly
DOM content in water sample to be measured.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Embodiment 1
As shown in Figure 1, the quality evaluation method provided in this embodiment based on DOM includes:
Step 101: control laser transmitting ultraviolet laser is incident to water sample to be measured, and the water sample to be measured is by described ultraviolet
Laser excitation generates scattered light signal and fluorescence signal；
Step 102: the scattered light signal and the fluorescence signal first being filtered, then are divided, after being divided
The fluorescence signal after the scattered light signal and light splitting；
Step 103: the scattered light signal after the light splitting and the fluorescence signal after the light splitting are passed through into light
It learns lens focus and to photodetector surfaces and is converted to electric signal；
Step 104: obtaining the electric signal, and carry out data processing and obtain the curve of spectrum；
Step 105: Raman peak intensity, fluorescence peak intensity and the ambient noise spectral intensity in the curve of spectrum are obtained,
The D of the water sample to be measured is calculated according to water quality assessment formulamValue, the water quality assessment formula are
Wherein, DmIndicate the content of Dissolved Organic Matter in water, IRRepresent the Raman peak intensity that water includes fluorescence background, IF
Water is represented in the fluorescence peak intensity of certain wavelength location, I0Indicate ambient noise spectral intensity.
Water quality assessment schematic diagram is as shown in Fig. 2, IR-IFIt is approximately the Raman peak intensity for deducting fluorescence background, IR-I0For button
Except the Raman peaks and fluorescence overall strength of background noise, the ratio result of the two generally changes between 0-1, multiplied by 100, then
Water quality assessment result DmRange meets habit of the people couple with water quality assessment between 0-100.According to water quality assessment result DmIt can
With evaluating water quality situation, numerical value is bigger, and expression water quality is better.
Quality evaluation method provided in this embodiment based on DOM, can with the real time measure water quality, facilitate in time understand and
Improve water quality, there is directive significance to selection water quality.
Embodiment 2
As shown in figure 3, the water quality assessment device provided in this embodiment based on DOM include: water sample 1 to be measured, test bottle 2,
Computer 3, laser controlling power supply 4, laser 5, optical filter 6, grating splitting system 7, optical lens 8,9 sum number of photodetector
According to capture card 10.
Test bottle 2 is that transparent material bottle needs for test bottle 2 to be placed in testing cassete in order to avoid ambient light interference, is swashed
The Laser emission end of light device 5 is close to testing cassete.
Select the water sample to be measured from five different places: ionized water, tap water, seawater, lake water, sewage respectively take 8mL to be packed into
In different test bottles 2, successively 5 test bottles 2 are put into testing cassete, carry out water sample DOM content evaluation and test to be measured.
Laser 5 is semiconductor laser, and output power is only 50mW, and energy consumption is lower.Computer 3 controls laser control
Power supply 4 processed is the power supply of laser 5, and 5 launch wavelength of laser is the ultraviolet laser of 405nm, and ultraviolet laser is incident on water to be measured
The optical axis shape of sample 1, ultraviolet laser optical path and grating splitting system forms an angle, and the fluorescence that can be avoided transparent material packaging is dry
It disturbs；Ultraviolet laser is incident on water sample 1 to be measured, and water sample 1 to be measured is excited to generate scattered light signal and fluorescence signal, makes to scatter light letter
Number and fluorescence signal first pass through optical filter 6 and filter, be divided using grating splitting system 7, then handled through optical lens 8
After focus on 9 surface of photodetector and be converted into electric signal, electric signal is acquired by data collecting card 10, and electric signal is passed
It transports to computer 3 and carries out data processing.
Water sample to be measured is evaluated and tested by labview software, the spectrum viewing area in the middle part of software interface can show sharp
The curve of spectrum of light excitation measured target.Software is according to formulaCalculate the D of the water sample to be measuredmValue；
Wherein, DmIndicate the content of Dissolved Organic Matter in water, IRRepresent the Raman peak intensity that water includes fluorescence background, IF
Water is represented in the fluorescence peak intensity of certain wavelength location, I0Indicate ambient noise spectral intensity, IR-IFIt is approximately to deduct fluorescence back
The Raman peak intensity of scape, IR-I0For the Raman peaks and fluorescence overall strength of background correction optical noise, the ratio result of the two generally exists
Change between 0-1, multiplied by 100, then water sample evaluation result Dm range to be measured meets people and water quality is commented between 0-100
The habit of survey, numerical value is bigger, and expression water quality is better.
Results display area on the right side of software interface show water quality to be measured evaluation and test as a result, evaluation result is as shown in table 1.
The Dm value evaluation result of 1 five kinds of difference water samples to be measured of table
Water sample evaluation result range to be measured is between 0-100, the water quality detection value highest of deionized water, close to 100, remaining
Water quality situation sequence is followed successively by seawater, tap water, lake water from high to low, and the water quality of sewage is worst, and only 7.26.
The water quality assessment device based on DOM that the present embodiment proposes, using miniature semiconductor laser and beam splitting system,
And circuit board Highgrade integration, substantially reduce the device volume of Fluorescence Spectrometer, have many advantages, such as it is portable, easy to use, can
To be used except laboratory condition, lay a good foundation for practical application.
For the device disclosed in the embodiment, since it is corresponded to the methods disclosed in the examples, so the ratio of description
Relatively simple, reference may be made to the description of the method.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (6)
1. a kind of quality evaluation method based on DOM, which is characterized in that the described method includes:
Control laser transmitting ultraviolet laser is incident to water sample to be measured, and the water sample to be measured is excited by the ultraviolet laser and generated
Scattered light signal and fluorescence signal；
The scattered light signal and the fluorescence signal are first filtered, then are divided, the scattering light letter after being divided
Number and light splitting after the fluorescence signal；
The scattered light signal after the light splitting and the fluorescence signal after the light splitting are focused on by optical lens
Photodetector surfaces are simultaneously converted to electric signal；
The electric signal is obtained, and carries out data processing and obtains the curve of spectrum；
Raman peak intensity, fluorescence peak intensity and the ambient noise spectral intensity in the curve of spectrum are obtained, according to water quality assessment
Formula calculates the D of the water sample to be measuredmValue, the water quality assessment formula are
Wherein, DmIndicate the content of Dissolved Organic Matter in water, IRRepresent the Raman peak intensity that water includes fluorescence background, IFIt represents
Fluorescence peak intensity of the water in certain wavelength location, I0Indicate ambient noise spectral intensity.
2. a kind of water quality assessment device based on DOM, which is characterized in that described device include: computer, laser, optical filter,
Grating splitting system, optical lens and photodetector, the computer controls the laser and emits ultraviolet laser, described
Ultraviolet laser is incident on water sample to be measured, and the water sample to be measured generates scattered light signal and fluorescence signal, the scattered light signal
The optical filter is first passed through with the fluorescence signal, then by the grating splitting system, is focused on after the optical lens
On the photoelectric detector surface, the electric signal transmission of generation to the computer.
3. the device of detection water quality DOM according to claim 2, which is characterized in that the laser is semiconductor laser
Device.
4. the device of detection water quality DOM according to claim 2, which is characterized in that the water sample to be measured is mounted in test bottle
In, the test bottle is transparent.
5. it is according to claim 2 detection water quality DOM device, which is characterized in that the ultraviolet laser optical path with it is described
The optical axis of grating splitting system forms angle.
6. the device of detection water quality DOM according to claim 2, which is characterized in that the photodetector using CCD or
The face CMOS battle array or linear array detector.
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| CN110118760A (en) * | 2019-05-13 | 2019-08-13 | 常州大学 | A kind of method of Dissolved Organic Matter in quick characterization soil |
| CN110887814A (en) * | 2019-11-28 | 2020-03-17 | 威海诚悦光电科技有限公司 | Underwater turbidity detection method based on spectral analysis |
| CN112834470A (en) * | 2020-12-31 | 2021-05-25 | 杭州罗盘星科技有限公司 | Three-dimensional fluorescence spectrum signal purification and enhancement method for water quality analysis |
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