CN105181667A - Ultraviolet fluorescence three-signal water quality sensor taking single UV-LED as light source and application thereof - Google Patents
Ultraviolet fluorescence three-signal water quality sensor taking single UV-LED as light source and application thereof Download PDFInfo
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Abstract
The invention discloses an ultraviolet fluorescence three-signal water quality sensor taking a single UV-LED as a light source and an application thereof and belongs to the fields of environmental monitoring and water treatment. The ultraviolet fluorescence three-signal water quality sensor comprises a light path part and a signal control processing part, wherein the light path part comprises one UV-LED, a sample tank, an ultraviolet probe, a fluorescent probe A and a fluorescent probe B; and the signal control processing part comprises a power supply module, a signal amplifier A, a signal amplifier B, a signal amplifier C, an analog-digital converter and a micro processor. The ultraviolet fluorescence three-signal water quality sensor has the advantages that no chemical reagent is consumed, real-time monitoring on change of overall concentration of dissolved organic matters in water can be realized, and real-time change of concentration of a protein or humus fluorescent component can be reflected, so that the ultraviolet fluorescence three-signal water quality sensor can be used for online predicting disinfection byproduct formation potential and degradation degree of micropollutants in an advanced oxidation process, and a flexible, rapid, efficient, economic, simple and informative online monitoring device is provided for water treatment.
Description
Technical field
The present invention relates to environmental monitoring and water treatment field, be specifically related to a kind of with single UV-LED be light source Ultraluminescence three signal water quality sensor and application.
Background technology
The composition of dissolved organic matter and character, all have material impact to the treatment effect of the techniques such as enhanced coagulation, membrane filtration, advanced oxidation, absorption and ion-exchange.Dissolved organic matter, particularly protide and Humus material are the important presomas of DBPs in Chlorination Process, and therefore in water treatment procedure, dissolved organic matter is important monitoring target.
Existing water technology, runs with the parameter of setting usually with carrying out sequencing.Because water quality exists fluctuation, the operational factor of various water technology is difficult to adjust in time according to actual conditions, there is consuming excessively or the problem of deficiency of medicament, the energy and material.In recent years, the concepts such as Internet of Things, cloud computing and industry 4.0 are changing life and the mode of production of people, and sensor is one of important front end link realizing these concepts.Sensitive in the urgent need to one, quick, efficient, economic, the easy online monitoring organic compounds device of existing water technology, for existing water technology and equipment ground Automated condtrol provide negative-feedback signal by sensor.
At present the common method of monitoring analysis is carried out to dissolved organic matter in water body and index mainly comprises: chemical oxygen demand (COD) (chemicaloxygendemand, COD), total organic carbon (totalorganiccarbon, TOC), ultraviolet spectrum, fluorescence spectrum.Compare with COD with TOC method, spectroscopic methodology without the need to chemical reagent, and fast, sensitive, convenient, be more suitable for as the Automated condtrol of water treatment system provides online negative-feedback signal.
The ultraviolet absorption value of some specific wavelengths at present; as 254nm (being called for short UV254); list USEPA's water and wastewater recycle standard method (EPASM5910B) in, be widely used as the proxy indicator reflecting organism relative concentration and aromaticity in water body.Why selecting 254nm wavelength, is that wherein a principal ray is near 254nm because early stage ultraviolet spectrometer (UVS) adopts low pressure mercury lamp to be light source.The dissolved organic matter on-line monitoring product of current employing ultraviolet spectroscopy and patent mainly adopt UV254 absorbance index (such as patent documentation---a kind of throw-in type uv absorption in-line analyzer, application number: 201110106617.8), the pulse xenon lamp that its light source generally adopts the life-span longer, but still have that volume is large, energy consumption is high, need the problem such as light splitting and heat-dissipating structure.
Relative to xenon lamp, deep ultraviolet LED has that monochromaticity is good, volume is little, energy consumption is low and luminescence efficiency advantages of higher.The deep ultraviolet LED of current commercialization comparative maturity has 265 ± 5nm, the serial wave band such as 280 ± 5nm and 310 ± 5nm.Based on existing Theory and technology, along with LED wavelength is lower, its chip needs the more aluminium element that adulterates, and yield rate, luminescence efficiency and serviceable life also decrease, and quantity of heat production sharply raises simultaneously.Select the LED near 254nm can there is efficiency, life-span, heat radiation and price problem equally as light source.
Due to protide in water body and the intrinsic fluorescent characteristic of Humus material, find broad application in the sign of three-dimensional fluorescence spectrum (excitationemissionmatrix, EEM) dissolved organic matter in Different Waters in recent years.According to three-dimensional fluorescence spectrum, choose reasonable fluorescence spectrum index, i.e. excitation wavelength and emission wavelength parameter are the keys realizing fluorescence method application on site.About the explanation of fluorescence peak in three-dimensional fluorescence spectrum, traditional view thinks that the fluorescence peak of different excitation/emission wavelength comes from different materials mistakenly.The research in our early stage shows that the fluorescence peak that excitation wavelength is different and emission wavelength is identical reflects identical material, therefore only needs selection excitation wavelength for the fluorescence peak that emission wavelength is identical.Under normal circumstances, according to the position of emission wavelength, protein matter and Humus material can be distinguished.In the invention in our early stage, propose a kind of with LED light emitting diode be light source Ultraluminescence dual signal water monitoring device and application process (application number 201410502662.9) thereof, but for realizing detection protide and Humus fluorescence, the LED needing employing two different is as light source, and the disunity of light source, often cause the unnecessary error of detection.
Summary of the invention
1. the technical matters that will solve
For exist in prior art for water quality detection medium ultraviolet absorption analysis equipment often volume comparatively large and be inconvenient to carry, problem that the high and multiple light courcess of cost exists unnecessary error, the invention provides a kind of Ultraluminescence three signal water quality sensor being light source with single UV-LED.Its comprehensive utilization universality of ultraviolet and the selectivity of fluorescence method and sensitivity, the monitoring to dissolved organic matter total concentration change in water body can be realized, the change of the fluorescent components such as protide or Humus concentration can be reflected, for water treatment provides one sensitive, quick, efficient, economical, simple and easy but informative on-Line Monitor Device simultaneously.
2. technical scheme
Through studying for a long period of time, present inventor finds that UV280 and UV254 all reflects identical dissolved organic matter, just the absorbance of UV280 is relatively weak, and the Rhenish finding of 16, Jiangsu Province regional potable water source district above county level and Karlsruhe, Germany area is shown, in surface water, both UV280/UV254 ratio is about 0.75, therefore can improve UV280 sensitivity by increase light path and follow-up signal treatment circuit two kinds of modes.In conjunction with the performance of LED and photodiode, select UV280 to substitute UV254 index and there is feasibility and economy.In addition, UV280 also can be used as the excitation source of protide fluorescence.Present inventor finds in Recent experimental process, and the ultraviolet light of 280 ± 15nm elicitor protein class and Humus material can produce fluorescence simultaneously.Although the ultraviolet light near 280nm wavelength is not the maximum excitation wavelength of soil ulmin fluorescence, but due to the transmitance of bandpass filter and the response of photodiode all higher at 410 ~ 480nm visible light wave range, still can detect Humus fluorescence signal enough delicately.
For achieving the above object, technical scheme provided by the invention is:
The Ultraluminescence three signal water quality sensor being light source with single UV-LED, comprise light path part and signal control treatment part, light path part comprises UV-LED, sample cell, ultraviolet detector, fluorescent probe A and fluorescent probe B, signal control treatment part comprises power module, signal amplifier A, signal amplifier B, signal amplifier C, analog to digital converter and microprocessor, UV-LED is 1, wherein: after opening power, the instruction of microprocessor output switch is to UV-LED driving circuit, control UV-LED lights by setting cycle or extinguishes, the ultraviolet light sent is after water sample in sample cell absorbs, the fluorescence produced and unabsorbed ultraviolet light are divided into three tunnels and detect: a road is detected through fluorescent probe A, two tunnels are detected through fluorescent probe B, three tunnels produce electric signal through ultraviolet detector, again respectively through signal amplifier A, signal amplifier B, signal amplifier C carries out amplification process, all carry out after analog to digital conversion becomes digital signal through analog to digital converter, be conveyed into microprocessor processes.
Preferably, the signal control treatment part display screen, storer, supervisory keyboard, the wireless communication apparatus that also comprise the LED drive circuit between power module and UV-LED and be connected with data line by wire with microprocessor; Digital signal is stored into storer by microprocessor, or being conveyed through host computer interface through data line/wireless communication apparatus outputs in host computer, display screen shows digital signal in real time, and is controlled and parameters input whole sensor by supervisory keyboard or host computer.
Preferably, affiliated power module as built-in power by lithium battery, is signal control treatment energize portions through DC-DC boost conversion module, and is powered to the UV-LED in light path part by constant-current source circuit.
Preferably, fluorescent probe A comprises photodiode and bandpass filter A, and fluorescent probe B comprises photodiode and bandpass filter B; Bandpass filter A wavelength is 330 ~ 360nm, for the monitoring of protide fluorescence; Bandpass filter B wavelength is 410 ~ 480nm, for the monitoring of Humus fluorescence; During detection, in water sample, fluorophore is excited sent fluorescence and is irradiated on photodiode respectively through bandpass filter A and bandpass filter B and produces electric signal.
Preferably, constant-current source circuit is with continuous or discontinuous manner work, and the frequency acquisition realizing arranging is monitored water quality.
Preferably, centered by UV-LED lamp source, wavelength is the deep ultraviolet LED of 280 ± 15nm scope.
Preferably, ultraviolet detector adopts the photodiode of ultraviolet strengthening response, and fluorescent probe adopts the photodiode of blue light strengthening response.
Preferably, the water sample of sample cell realizes sample collection with the flow velocity of siphon, peristaltic pump and water sample self or pressure, carries out on-line monitoring or select cuvette to sample carrying out Portable manual sampling and measuring.
Preferably, UV-LED light emitting anger is less than 30 degree, and to avoid oblique fire, sample cell or cuvette are quartzy light-transmitting materials.
An application for the Ultraluminescence three signal water quality sensor being light source with single UV-LED, at least can be applied to monitoring water quality on line, palliating degradation degree prediction that Disinfection Byproducts in Drinking Water generates micropollutants in the prediction of gesture, ozone high grade oxidation technique.
3. beneficial effect
Compared to immediate prior art, usefulness of the present invention is:
(1) a kind of Ultraluminescence three signal water quality sensor that is light source with single UV-LED of the present invention, with single deep ultraviolet LED for light source, compared with the online prison equipment being light source with existing employing pulse xenon lamp or LED array lamp group, there is volume little, energy consumption is low, cost is low, and structure is simple, without the need to advantages such as heat radiations;
(2) a kind of Ultraluminescence three signal water quality sensor that is light source with single UV-LED of the present invention, adopt UV280LED as light source, and adopt the low wavelength LED of wavelength near 254nm as compared with light source, there is price low, life-span is long, the advantage that luminescence efficiency is high and quantity of heat production is little.Simultaneously with the photodiode detection ultraviolet absorptivity of ultraviolet strengthening, its photoelectric response near 280nm is better than the 254nm of low wavelength.In addition, UV280LED can elicitor protein class fluorescence better.Therefore, UV280 ultraviolet absorptivity index is adopted to be more suitable for monitoring water quality on line;
(3) a kind of Ultraluminescence three signal water quality sensor that is light source with single UV-LED of the present invention, while monitoring UV280 ultraviolet absorptivity, adopt bandpass filter in conjunction with photodiode as fluorescent probe, monitoring protide fluorescence and Humus fluorescence two kinds of signals.Fully utilized the relative broad spectrum activity of UV signal and the selectivity of fluorescence signal and sensitivity, reflection more about the water quality information of dissolved organic matter, can be suitable for polytype water sample;
(4) a kind of Ultraluminescence three signal water quality sensor that is light source with single UV-LED of the present invention, the change of environment temperature can cause the minor fluctuations of LED light source luminescence efficiency.Different series LED luminous intensity is also different to the susceptibility of variation of ambient temperature, and its serviceable life also there are differences.Relative to the multiple LED of employing, adopt the single led three kinds of signals produced as light source, between its signal, ratio can weaken the impact of intensity of light source change, can reflect the change of dissolved organic matter component more truely and accurately;
(5) a kind of Ultraluminescence three signal water quality sensor that is light source with single UV-LED of the present invention, fluorescence signal that sample produces be irradiated to LED light source simultaneously and detected by the UV signal of sample, the comprehensive utilization universality of ultraviolet method and the selectivity of fluorescence method, the monitoring to dissolved organic matter total concentration change in water body can be realized, the concentration of the fluorescent components such as protide or Humus and the change of redox characteristic can be reflected simultaneously, qualitative and quantitative analysis has more advantage, Real-time Monitoring Data is provided for scientific research and water treatment run.
Accompanying drawing explanation
Fig. 1 is block schematic illustration of the present invention;
Fig. 2 is power module circuitry schematic diagram (comprising LED drive circuit) of the present invention;
Fig. 3 is fluorescence signal amplifying circuit schematic diagram of the present invention;
Fig. 4 is UV signal amplifying circuit schematic diagram of the present invention;
Fig. 5 is light path part space structure figure of the present invention;
Fig. 6 is that host computer shows schematic diagram in real time by Labview software;
Fig. 7 is the data and curves figure of three kinds of multiple water samples of signal on-line monitoring of the present invention;
Fig. 8 is model machine stereographic map of the present invention;
Fig. 9 is the graph of a relation that three kinds of signals of the present invention and DBPs generate gesture;
Figure 10 is the data and curves figure of three kinds of signal on-line monitoring ozone process treatment effects of the present invention;
Figure 11 is the graph of a relation that soil ulmin fluorescence signal of the present invention and micropollutants ozone oxidation are degraded.
Number in the figure illustrates: 51, UV-LED; 52, sample cell; 53, bandpass filter A; 54, bandpass filter B; 55, photodiode; 61, ultraviolet detector digital signal shows in real time; 62, fluorescent probe A digital signal shows in real time; 63, fluorescent probe B digital signal shows in real time; 71, tap water online monitoring data; 72, river online monitoring data; 73, city domestic sewage online monitoring data; 74, certain dyeing waste water biochemical treatment water outlet online monitoring data; 81, two Euros of denomination of coin; 101, pure water school zeroth order section; 102, fill phase; 103, the stabilization sub stage; 104, the ozone degradation stage.
Embodiment
Below in conjunction with Figure of description and specific embodiment, the present invention is described in detail.
Embodiment 1
The Ultraluminescence three signal water quality sensor that the present embodiment a kind of is light source with single UV-LED, monitor ultraviolet absorptivity UV280 simultaneously, protide fluorescence and Humus fluorescence three kinds of signals, as shown in Figure 1, comprise light path part and signal control treatment part, as shown in Figure 5, light path part comprises UV-LED51, sample cell 52, ultraviolet detector, fluorescent probe A and fluorescent probe B; UV-LED selects wavelength to be the deep ultraviolet LED of 280 ± 15nm, and adopt the encapsulation of TO39 support, light emitting anger is less than 30 degree.Ultraviolet detector adopts the photodiode 55 of ultraviolet strengthening response.Fluorescent probe comprises silicon photoelectric diode 55 and bandpass filter, selects wavelength to be the monitoring of bandpass filter A53 for protide fluorescence of 330 ~ 360nm; Select wavelength to be the monitoring of bandpass filter B54 for Humus fluorescence of 410 ~ 480nm simultaneously.
Sample cell is quartzy light-transmitting materials flow cell or cuvette.When adopting sample flow cell, utilize siphon, peristaltic pump and monitor flow velocity or the pressure of water body self, realize sample collection, carry out on-line monitoring; Cuvette is applicable to Portable manual sampling and measuring.
Signal control treatment part comprises power module, LED drive circuit, signal amplifier A, signal amplifier B, signal amplifier C, analog to digital converter, microprocessor, display screen, storer, supervisory keyboard, host computer interface and wireless communication apparatus; UV-LED is 1.
Power module major function as shown in Figure 2 comprises for UV-LED and is the power supply such as system amplifier and singlechip chip in whole water quality sensor, provides the constant current source of 20mA and the amplifier power supply of+7.5V and-7.5V and 3.3V power supply.Adopt lithium battery power supply in this example, DC-DC boost conversion be carried out, as shown in Figure 2, by adopting the tps61040 of TI company to realize in the present embodiment, its input voltage range 1.8-6V, exports maximum 28V and conversion efficiency nearly 90%, directly can be converted to positive-negative power.LED drive circuit shown in Fig. 2 adopts LM317 chip to form the accurate adjustable constant current source of 20mA in conjunction with fixed value resistance.Utilize the low and high level of single-chip microcomputer to the EN pin of tps61040 to control, realize the continuous of LED or be interrupted switch.The dutycycle of being interrupted switch sets by Single Chip Microcomputer (SCM) program.
The amplifying circuit of fluorescence signal shown in Fig. 3 schematic diagram, the electric current produced due to fluorescent probe in the present embodiment is pA level, needs the input bias current considering amplifier when carrying out I-V conversion.Adopt the OPA129 chip of TI company herein, its bias current is 100fA to the maximum, and has extremely low noise and temperature drift.Due to I-V transfer resistance very large (G level), outside noise and interference enter circuit easily via large resistively couple, influential system system energy.Experiment shows the 50Hz Hz noise outputing signal the nearly 200mV of peak value, is adding the low-pass filter solution that a bandwidth is 10Hz thereafter.Fluorescence signal amplifier A and B designs substantially identical, and the key distinction is the size of I-V transfer resistance, i.e. the difference of circuit enlargement factor.
Figure 4 shows that UV signal amplifying circuit, because ultraviolet detector electric current is mA level, the OPA129 chip of same employing TI company, its I-V transfer resistance is little, the Hz noise be subject to is very little, only need to add thereafter a passive filter again, its response time is (the present embodiment is decided to be 2ms) quickly.
The modules such as microprocessor, display screen, storer, control button, host computer interface, radio communication and analog to digital conversion and auxiliary circuit thereof are integrated on motherboard circuit.In the implementation case, microprocessor adopts the CC2530 chip of TI company, is the close range wireless communication chip of a kind of 2.4-GHz based on IEEE802.15.4 standard.
The Ultraluminescence three signal water quality sensor being light source with single UV-LED of the present embodiment, as shown in Figure 8, contrast can find with the two Euros of denomination of coin 81 being placed in water quality sensor end face, its volume is little, carry with very easy to use, in the course of the work, microprocessor output switch command signal is to LED drive circuit, and control UV-LED lamp source carries out work with continuous or form of discontinuity, UV-LED sends ultraviolet source after water sample in sample cell absorbs, the fluorescence produced and unabsorbed ultraviolet light are divided into three tunnels: a road is detected through fluorescent probe A, two tunnels are detected through fluorescent probe B, three tunnels produce electric signal through ultraviolet detector, again respectively through signal amplifier A, signal amplifier B, signal amplifier C carries out amplification process, all carry out after analog to digital conversion becomes digital signal through analog to digital converter, be conveyed into microprocessor processes, digital signal is stored into storer by microprocessor, or being conveyed through host computer interface through data line/wireless communication apparatus outputs in host computer, display screen shows digital signal in real time, and by supervisory keyboard or host computer, whole sensor is controlled and parameters input, as shown in Figure 6, the data of wireless data transfer module acquisition can be shown in real time by Labview software: have ultraviolet detector digital signal to show 61 in real time at host computer, fluorescent probe A digital signal shows 62 in real time, fluorescent probe B digital signal shows 63 in real time, that uses the present embodiment is light source with single UV-LED Ultraluminescence three signal water quality sensor has carried out on-line testing to somewhere tap water, river, city domestic sewage and certain dyeing waste water biochemical treatment water outlet, and each water sample is pumped in sample cell by peristaltic pump.Three kinds of signal online monitoring data are as shown in Figure 7: tap water online monitoring data 71, river online monitoring data 72, city domestic sewage online monitoring data 73, certain dyeing waste water biochemical treatment water outlet online monitoring data 74.
Each water sample monitoring numerical statistic is as shown in the table:
By contrast fluorescence intensity and ratio thereof, can find out, protein matter relative abundance in sanitary sewage, and the contribution of protein matter to ultraviolet absorptivity UV280 is larger; Ultraviolet absorptivity and the fluorescence signal of dyeing waste water biochemical treatment water outlet are the strongest.
Embodiment 2
The Ultraluminescence three signal water quality sensor being light source with single UV-LED of the present embodiment, its concrete structure, with embodiment 1, can be applied to Disinfection Byproducts in Drinking Water and generate in the prediction of gesture.
Carry out sterilizing to the water sample after Jiangsu Province 16 counties and cities' drinking water resource and enhanced coagulation and ion-exchange treatment thereof and generated gesture experiment, use water quality sensor to test the UV280 ultraviolet absorptivity of each water sample, protide and Humus fluorescence signal, and use vapor-phase chromatography and gaseous mass spectrum to detect DBPs index haloform (THMs) and halogen acetic acid (HAAs).As shown in Figure 9, by carrying out matching to spectral signal and DBPs growing amount, result shows that three kinds of signals all can be used for generating DBPs the prediction of gesture.Wherein, for THMs, ultraviolet absorptivity UV280 and Humus fluorescence signal fitting effect are better than protide fluorescence; And HAAs is generated to the prediction of gesture, protide fluorescence signal is better than ultraviolet absorptivity UV280, Humus fluorescence signal the best therefore, for specific water factory, DBPs concentration can be detected by the initial stage, build the relation with above-mentioned three kinds of spectral signals, realize on-line prediction DBPs and generate gesture, ensure water quality safety.
Embodiment 3
The Ultraluminescence three signal water quality sensor being light source with single UV-LED of the present embodiment, can be applied to the palliating degradation degree of micropollutants in prediction ozone high grade oxidation technique.
Change of water quality curve in the Ultraluminescence three signal water quality sensor on-line monitoring ozone oxidation process of the present embodiment, as shown in Figure 10, is divided into pure water school zeroth order section 101, fill phase 102, stabilization sub stage 103 and ozone degradation stage 104.Present inventor have studied the palliating degradation degree of 14 kinds of micropollutants in ozonation technology and the relation of ultraviolet absorptivity UV280 or protide fluorescence signal or Humus fluorescence signal clearance, these 14 kinds of micropollutants comprise: bisphenol-A (CAS:80-05-7), carbamazepine (CAS:298-46-4), C14H10Cl2NNaO2 (CAS:15307-86-5), sulfamethoxazole (CAS:723-46-6), triclosan (CAS:3380-34-5), methoxybenzyl aminopyrimidine (CAS:738-70-5), atenolol (CAS:29122-68-7), Gemfibrozil (CAS:25812-30-0), Metadelphene (CAS:134-62-3), brufen (CAS:15687-27-1), phenytoinum naticum (CAS:57-41-0), Primidone (CAS:125-33-7), Atrazine (CAS:1912-24-9), tricresyl phosphate (2-chloropropyl) ester (CAS:13674-84-5). result shows, when above-mentioned three kinds of spectral signal clearances reach about 50%, the clearance to micropollutants more than 90% common in surface water or city domestic sewage can be realized, as shown in figure 11, relation in different water sample ozone oxidation process between Humus fluorescence signal and medicine carbamazepine clearance.Therefore can by the prediction of change realization to common micropollutants palliating degradation degree of Ultraluminescence signal in Ozone Water treatment process.
Below be schematically described the invention and embodiment thereof, this description does not have restricted, and one of embodiment of the also just the invention shown in accompanying drawing, actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from this creation aim, designing the frame mode similar to this technical scheme and embodiment without creationary, the protection domain of this patent all should be belonged to.
Claims (10)
1., with the Ultraluminescence three signal water quality sensor that single UV-LED is light source, comprise light path part and signal control treatment part, described light path part comprises UV-LED, sample cell, ultraviolet detector, fluorescent probe A and fluorescent probe B; Described signal control treatment part comprises power module, signal amplifier A, signal amplifier B, signal amplifier C, analog to digital converter and microprocessor; It is characterized in that: described UV-LED is 1, wherein:
Turn on the power switch as after whole water quality sensor powers, microprocessor is with the periodic Control UV-LED light source switch of setting, the ultraviolet light that UV-LED sends is after water sample in sample cell absorbs, the fluorescence produced and unabsorbed ultraviolet light are divided into three tunnels and detect: a road is detected through fluorescent probe A, two tunnels are detected through fluorescent probe B, three tunnels produce electric signal through ultraviolet detector, again respectively through signal amplifier A, signal amplifier B, signal amplifier C carries out amplification process, all carry out after analog to digital conversion becomes digital signal through analog to digital converter, be conveyed into microprocessor processes.
2. the Ultraluminescence three signal water quality sensor that is light source with single UV-LED according to claim 1, is characterized in that: display screen, storer, supervisory keyboard, wireless communication apparatus that described signal control treatment part is also comprised the LED drive circuit between power module and UV-LED and is connected with data line by wire with microprocessor; Digital signal is stored into storer by described microprocessor, or being conveyed through host computer interface through data line/wireless communication apparatus outputs in host computer, described display screen shows digital signal in real time, and is controlled and parameters input whole sensor by described supervisory keyboard or host computer.
3. the Ultraluminescence three signal water quality sensor that is light source with single UV-LED according to claim 1 and 2, it is characterized in that: affiliated power module by lithium battery as built-in power, be signal control treatment energize portions through DC-DC boost conversion module, and by constant-current source circuit, the UV-LED in light path part powered.
4. the Ultraluminescence three signal water quality sensor that is light source with single UV-LED according to claim 3, it is characterized in that: described fluorescent probe A comprises photodiode and bandpass filter A, described fluorescent probe B comprises photodiode and bandpass filter B; Described bandpass filter A wavelength is 330 ~ 360nm, for the monitoring of protide fluorescence; Described bandpass filter B wavelength is 410 ~ 480nm, for the monitoring of Humus fluorescence; During detection, in water sample, fluorophore is excited sent fluorescence and is irradiated on photodiode respectively through bandpass filter A and bandpass filter B and produces electric signal.
5. the Ultraluminescence three signal water quality sensor that is light source with single UV-LED according to claim 4, is characterized in that: described constant-current source circuit is with continuous or discontinuous manner work, and the frequency acquisition realizing arranging is monitored water quality.
6. the Ultraluminescence three signal water quality sensor that is light source with single UV-LED according to claim 4, is characterized in that: centered by described UV-LED lamp source, wavelength is the deep ultraviolet LED of 280 ± 15nm scope.
7. the Ultraluminescence three signal water quality sensor that is light source with single UV-LED according to claim 6, it is characterized in that: described ultraviolet detector adopts the photodiode of ultraviolet strengthening response, described fluorescent probe adopts the photodiode of blue light strengthening response.
8. the Ultraluminescence three signal water quality sensor that is light source with single UV-LED according to claim 6, it is characterized in that: the water sample of described sample cell realizes sample collection with the flow velocity of siphon, peristaltic pump and water sample self or pressure, carry out on-line monitoring or select cuvette to sample carrying out Portable manual sampling and measuring.
9. the Ultraluminescence three signal water quality sensor that is light source with single UV-LED according to claim 8, it is characterized in that: described UV-LED light emitting anger is less than 30 degree, described photodiode is silicon photoelectric diode, and described sample cell or cuvette are quartzy light-transmitting materials.
10. according to claim 9 with an application for the single UV-LED Ultraluminescence three signal water quality sensor that is light source, it is characterized in that: be at least applied to monitoring water quality on line, prediction that Disinfection Byproducts in Drinking Water generates gesture, the palliating degradation degree prediction of micropollutants in ozone high grade oxidation technique.
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