CN204594872U - COD and the online monitoring sensor simultaneously of nitrate nitrogen content multiparameter - Google Patents
COD and the online monitoring sensor simultaneously of nitrate nitrogen content multiparameter Download PDFInfo
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- CN204594872U CN204594872U CN201520253703.5U CN201520253703U CN204594872U CN 204594872 U CN204594872 U CN 204594872U CN 201520253703 U CN201520253703 U CN 201520253703U CN 204594872 U CN204594872 U CN 204594872U
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Abstract
The utility model relates to a kind of COD and the online monitoring sensor simultaneously of nitrate nitrogen content multiparameter, it is characterized in that the ultraviolet absorptivity method based on Lambert-Beer law, test substance in water is utilized to the characteristic absorption of purple light, to set up the relation of absorbance and test substance concentration; Utilize the chemical oxygen demand (COD) concentration value of the absorbance of water sample at 254nm place and water sample to set up linear relationship, utilize the absorbance of water sample at 210nm place and nitrate nitrogen content to set up linear relationship.Monitoring method comprises calibration sensor and water sample tests two parts, and the sensor utilizing the utility model to provide is 0mg/L ~ 50mg/L to the measurement range of chemical oxygen demand (COD), and the measurement range of nitrate nitrogen is 0mg/L ~ 7mg/L.Demonstrate obvious superiority, can directly put into water and measure, to meet the testing requirement of general water body.
Description
Technical field
The utility model relates to a kind of COD (chemical oxygen demand (COD)), the online monitoring sensor simultaneously of nitrate nitrogen content multiparameter, described sensor to can be used in water body quick determination and analysis while chemical oxygen demand (COD) and nitrate nitrogen content, belongs to sensor technical field.
Background technology
Chemical oxygen demand (COD) (Chemical Oxygen Demand, COD) refers under certain conditions, and by the amount of reducing substances oxidation institute oxygen consumed agent in 1L water sample, result is converted to the content of oxygen, and unit is mg/L.COD is the tolerance to the organism contained in water and inorganic oxide substrate concentration, reflects the degree that water body pollutes by reducing substances.It is very general that water body is subject to Organic Pollution, and organism can consume the oxygen be dissolved in water body excessively, causes body eutrophication, brings harmful effect to aquatic organism.Nitrate is extensively present in natural water, nitrate in water is under aerobic environment, nitrogen compound the most stable in the nitrogen-containing compound of the various form such as nitrite, ammonia nitrogen, also be itrogenous organic substance through the final decomposition product of mineralization, be prevalent in river, lake and underground water, the product etc. that the nitrate nitrogen in water quality is mainly derived from the itrogenous organic substances such as industrial waste water, sanitary sewage, agricultural drainage and is decomposed by the microorganisms.The higher meeting of nitrate nitrogen content brings harm in various degree to aquatic organism, human body.So chemical oxygen demand (COD) (COD), nitrate nitrogen content are all the important indicators judging degree of water pollution, be also water quality monitoring website at different levels must survey project.
Current domestic water-quality COD common detection methods be substantially adopt the potassium dichromate method that specify of GB11914-89 or its improve one's methods, the detection major part of nitrate nitrogen is the chromatography of ions etc. that the phenol disulphonic acid spectrophotometry that specifies of employing GB7480-87 or GB13580.5-92 specify.These methods often need from water head site collected specimens, be transported to laboratory, recycle various instrument to analyze water quality, the advantages such as accurate are detected although have, but there is length consuming time, require high to testing staff is professional and there is the shortcomings such as the possibility of secondary pollution, the demand of real time on-line monitoring cannot be met.
For the problem of monitoring water quality on line, recent domestic scholar and relevant enterprise propose much new method, mainly contain two classes.
One class is the improvement based on classic method, build online monitoring sensor, " research of water quality total phosphorus total nitrogen on-line automatic monitoring technology " on " Environmental science and technology " is published in, the Ammonium Analyzers monitoring water quality on line system etc. of Hash company of the U.S. as Wang Baian etc.Such water quality detection sensor, by process implementation automation mechanized operations such as samplings, instead of the artificial sample in classic method, improves efficiency.But shortcomings such as still there is length consuming time, have secondary pollution, testing cost is high, thus limits the scope of application of such sensor.
Another kind of is monitoring water quality on line sensor based on ultraviolet absorptivity method (UV method), it is fast that these class methods have analysis speed, multiple pollutant can be detected, the advantages such as non-secondary pollution, Chinese scholars has all carried out the research to such sensor, as being published in the spectro:lyser water quality monitoring sensor mentioned in " the On-line monitoring for control of a pilot-scale sequencing batch reactor using asubmersible UV/VIS spectrometer " on " Water Science and Technology ", with the xenon lamp that glimmers for ultraviolet source, take ultraviolet image sensor as photo-electric conversion element, gather the ultra-violet absorption spectrum of water body, can to chemical oxygen demand (COD) in water body, multiple parameter such as nitrate nitrogen carries out on-line monitoring, but this sensor is owing to adopting the expensive components such as imageing sensor, cause inner structure complicated, cost is high, be difficult to widespread adoption.For another example China Patent Publication No. CN102519897A publication date: on June 27th, 2012 patent document discloses a kind of water quality COD detection method based on LED multi-feature wavelength and device.The LED of multiple different characteristic wavelength is it is characterized in that to design on rotating disk as light source, by controlling dial rotation toggle lights, using photosensitive tube as photo-electric conversion element, realize the detection to chemical oxygen demand (COD), effectively reduce the cost of device, but the use of multiple LED adds volume and the power consumption of sensor, the existence of internal activity parts also reduces the stability of this device long-time running.
Based on above status both at home and abroad, the utility model is intended based on ultraviolet absorptivity method, select miniature deuterium lamp (200nm ~ 400nm) as light source (having the efficiency higher than xenon lamp), the photosensitive tube of low cost is as photo-electric conversion element, the optical filter that recycling different wave length band leads to, through the optical fiber of particular design and detection probe, develop can two-parameter in order to chemical oxygen demand (COD), nitrate nitrogen while on-line monitoring sensor.Sensor provided by the utility model can directly immerse in water body, chemical oxygen demand (COD), nitrate nitrogen two parameters can be measured simultaneously, single measurement can complete in several minutes, not only measuring process is simply rapid, non-secondary pollution, and the advantage having that structure is simple, cost is low, be well suited for widespread adoption, similar sensor rarely has report, thus is built into design of the present utility model.
Utility model content
The purpose of this utility model is to provide a kind of COD and nitrate nitrogen content multiparameter online monitoring sensor and method simultaneously, to overcome existing COD, nitrate nitrogen monitoring method complicated operation, poor stability, length consuming time, integrated level is poor, there is the shortcomings such as secondary pollution, the sensor that the utility model provides adopts ultraviolet absorptivity method, the mensuration of COD and nitrate nitrogen content is integrated on a probe, can Simultaneously test COD and nitrate nitrogen content by a probe, and it is simple to operate, stability is high, measure rapidly, integrated level is high, non-secondary pollution, be with a wide range of applications.
Specifically, the utility model is the ultraviolet absorptivity method based on Lambert-Beer law, utilizes test substance in water to the characteristic absorption of purple light, to set up the relation of absorbance and test substance concentration.Utilize the chemical oxygen demand (COD) concentration value of the absorbance of water sample at 254nm place and water sample to set up linear relationship, utilize the absorbance of water sample at 210nm place and nitrate nitrogen content to set up linear relationship.
The technical scheme of the online monitoring sensor simultaneously of a kind of chemical oxygen demand (COD), nitrate nitrogen content multiparameter:
Sensor is primarily of following five part compositions: (one) light source module (miniature deuterium lamp); (2) signals collecting and sending module (water joint, multi-channel signal acquiring circuit board, 1# photosensitive tube, 2# photosensitive tube, 3# photosensitive tube); (3) optic module (1# signal optical fibre, 2# signal optical fibre, luminous source optical fiber, reference optical fiber, 254nm bandpass filter, 210nm bandpass filter); (4) detection probe (detection probe light terminal, catoptron) (five) stainless steel casing.Wherein light source module, signals collecting and sending module, optic module are all encapsulated in stainless steel casing inside, and detection probe reaches outside by the screw hole that stainless steel casing is reserved, are fixed together between probe and shell by water-proof nut.Miniature deuterium lamp (200nm-400nm) is coupled by general-purpose interface and luminous source optical fiber.Reference optical fiber of wherein leading up to directly enters 3# photosensitive tube, as the signal designation whether light source normally works as with reference to light; An other road enters into the detection probe of water sample, through the absorption of water sample, then is reflected back signal optical fibre by catoptron, and a part of reflected light enters 1# signal optical fibre, enters 1# photosensitive tube through 254nm optical filter, in order to detect chemical oxygen demand (COD); Another part reflected light enters 2# signal optical fibre, enters 2# photosensitive tube through 210nm optical filter, in order to detect nitrate nitrogen concentration.Gathered the voltage signal of three photosensitive tubes again by multi-channel signal acquiring circuit board, signal, through back-end processor process, is converted to absorbance, is sent to monitoring center by wireless base station apparatus simultaneously.
Device specifically describes as follows:
(1) light source
Adopt wavelength coverage be the deuterium lamp of 200nm-400nm as ultraviolet source, supply voltage is 12V, and power is 6W.
(2) signal acquisition module
Signal acquisition module adopts general amplification and Acquisition Circuit module, from photosensitive tube, (photosensitive tube is purchased from German Silicon Sensor International AG company, model is PC10-2TO5) electric signal that exports amplifies via signal acquisition module, filtering, re-sends to rear end and processes.
(3) optic module
Optical fiber design as shown in Figure 2, wherein source ends optical fiber is 4 cores, wherein 3 diameters are 400 μm, i.e. luminous source optical fiber, luminous source optical fiber connects source ends and detection probe end, provides ultraviolet source to detection probe, a diameter is 100 μm, whether i.e. reference optical fiber, is connected to reference light terminal, normally work in order to indicate light source; Detection probe end optical fiber is 9 cores, diameter is 400 μm, wherein three are connected with luminous source optical fiber terminal, and three (i.e. 1# signal optical fibres) are connected with 1# signal optical fibre terminal, also have three (i.e. 2# signal optical fibres) to be connected with 2# signal optical fibre terminal.By such design, the light signal come from probe collection be divide into two-way, leading up to 1# signal optical fibre 9 and 254nm bandpass filter enters 1# photosensitive tube, separately leading up to 2# signal optical fibre 10 and 210nm bandpass filter enters 2# photosensitive tube, namely achieves and monitors while two wavelength place absorbances.All fibre-optical splices all select SMA905 adapter, and fiber optic materials all selects high grade quartz optical fiber, transmission wavelength scope 200nm-1100nm.
(4) detection probe
Detection probe end optical fiber structure is as described in (3) optic module, wherein catoptron is fixed on by adjustable screw-type design and detects on light terminal, can free adjustment light path, it adopts the ultraviolet reflectance minute surface of high reflectance, whole detection probe stainless steel is made, directly can insert in water and use, structure as shown in Figure 3.
(5) stainless steel casing
The each module of sensor is all encapsulated in stainless steel casing, and each external interface all uses water joint, and whole sensor can be placed directly in and use under water.
A technical scheme for chemical oxygen demand (COD), nitrate nitrogen content multiparameter on-line monitoring method, the steps include:
(1) calibration sensor:
With chemical oxygen demand (COD) or the nitrate nitrogen solution of a series of concentration known of this sensor measurement (National Standard Method measurement), the absorbance obtained and concentration known are set up linear relationship according to Lambert-Beer law, wherein 1# photosensitive tube measures be the absorbance of water body at 254nm place, and itself and chemical oxygen demand (COD) concentration are set up linear relationship and updating formula; 2# photosensitive tube measures be the absorbance of water body at 210nm place, and itself and nitrate nitrogen concentration are set up linear spectrum and updating formula.Calibrated sensor just can be used for carrying out on-line monitoring to the chemical oxygen demand (COD) of actual water sample, nitrate nitrogen.
(2) water sample test:
This sensor is directly put into water body can test, wherein 1# photosensitive tube data measured is converted to chemical oxygen demand (COD) concentration by updating formula, and 2# photosensitive tube data measured is converted to nitrate nitrogen concentration by updating formula.Chemical oxygen demand (COD) and nitrate nitrogen concentration in water body can be monitored simultaneously.
With compared with prior art, usefulness of the present utility model is:
(1) the utility model build a kind of chemical oxygen demand (COD), nitrate nitrogen content multiparameter on-line monitoring sensor and method thereof, compared with the water quality on-line monitoring instrument device based on traditional chemical routes, the utility model is based on ultraviolet absorptivity method, the characteristic absorption of test substance to purple light in water is utilized to carry out detection of contamination, it is a kind of pure physical method, measuring process is simple rapidly, without the need to adding chemical reagent, be more suitable for long-term monitoring water quality on line.
(2) the utility model build a kind of chemical oxygen demand (COD), nitrate nitrogen content multiparameter on-line monitoring sensor and method thereof, adopt LED as compared with light source with existing same quasi-instrument, the utility model selects low-power consumption ultraviolet deuterium lamp as light source, there is low-power consumption, can work long hours, without the need to the advantage of preheating, and wavelength coverage can be provided to be the ultraviolet light of 200nm-400nm, without the need to installing multiple LED to increase optical source wavelength scope, improve the performance of sensor, the on-line monitoring of long-term high frequency time can be carried out.
(3) the utility model build a kind of chemical oxygen demand (COD), nitrate nitrogen content multiparameter on-line monitoring sensor and method thereof, with adopt expensive imageing sensor as photo-electric conversion element with compared with quasi-instrument, the utility model selects the photosensitive tube of low cost to make photo-electric conversion element, coordinate the use of optical filter, effectively reduce the cost of sensor, make the extensive use of this sensor more feasible.
(4) the utility model build a kind of chemical oxygen demand (COD), nitrate nitrogen content multiparameter on-line monitoring sensor and method thereof, compared with realizing the instrument of light splitting with employing lens, the utility model adopts the optical fiber of particular design and detection probe to realize light splitting and transmission, structure is simpler, spectrophotometric result more better than lens, and effectively reduce maintenance cost.
(5) the utility model have employed deuterium lamp as light source, can measure the absorbance of water body at 254nm and 210nm place simultaneously, namely carries out on-line monitoring to chemical need amount and nitrate nitrogen content simultaneously.The maximum feature of this sensor being the utility model provides.
Accompanying drawing explanation
Fig. 1 is overall construction drawing of the present utility model;
Fig. 2 is the utility model optic module detail view;
Fig. 3 is detection probe structural representation of the present utility model;
Fig. 4 is the chemical oxygen demand (COD) concentration of the utility model embodiment and the linear relationship chart of absorbance (254nm);
Fig. 5 is the nitrate nitrogen concentration of the utility model embodiment and the linear relationship chart of absorbance (210nm).
Number in the figure is described as follows:
1. water joint
2. ultraviolet source-deuterium lamp (optical source wavelength scope 200nm ~ 400nm)
3. multi-channel signal acquiring circuit board
4.1# photosensitive tube (sensitive wave length scope is 200nm ~ 1100nm)
5.2# photosensitive tube (sensitive wave length scope is 200nm ~ 1100nm)
6.3# photosensitive tube (sensitive wave length scope is 200nm ~ 1100nm)
7. centre wavelength is 210nm bandpass filter (half-peak breadth 30nm)
8. centre wavelength is 254nm bandpass filter (half-peak breadth 30nm)
9.1# signal optical fibre (3 core fibre core diameters are 400um)
10.2# signal optical fibre (3 core fibre core diameters are 400um)
11. reference optical fibers (1 core fibre core diameter is 100um)
12. luminous source optical fibers (3 core fibre core diameters are 400um)
13. stainless steel sleeves
14. detection probe
15.2# signal optical fibre terminal
16. luminous source optical fiber terminals
17. reference optical fiber terminals
18.1# signal optical fibre terminal
19. detection probe optic fibre connectors
20. incident lights
21. reflected light
22. catoptrons
Embodiment
Only the utility model is described further below in conjunction with drawings and Examples, to set forth the substantive distinguishing features of the application and significant progress further, but limits the utility model absolutely not.
Embodiment 1
As shown in Figure 1: the online monitoring sensor simultaneously of chemical oxygen demand (COD) provided by the utility model, nitrate nitrogen content multiparameter is primarily of following five part compositions: (one) light source module (ultraviolet source-miniature deuterium lamp 2); (2) signals collecting and sending module (water joint 1, multi-channel signal acquiring circuit board 3,1# photosensitive tube 4,2# photosensitive tube 5,3# photosensitive tube 6); (3) optic module (reference optical fiber 11,254nm bandpass filter 8,210nm bandpass filter 7,1# signal optical fibre 9,2# signal optical fibre 10, luminous source optical fiber 12); (4) detection probe module (detection probe 14), above four modules are all encapsulated in stainless steel casing 14, and light signal is by Optical Fiber Transmission, and electric signal is transmitted by shielded cable.Miniature deuterium lamp 2 (200nm-400nm) is coupled by general-purpose interface and luminous source optical fiber 12, and wherein a road ultraviolet light directly enters 3# photosensitive tube 6, as the reference value of the intensity of light source by reference to optical fiber 11 as with reference to light; The detection that an other road enters into water sample visits 14, through the absorption of water sample, optical fiber is reflected back again by catoptron, part reflected light enters 1# signal optical fibre 9,1# photosensitive tube 4 is entered through 254nm bandpass filter 8, another part reflected light enters 2# signal optical fibre 10, enters 2# photosensitive tube 5 through 210nm optical filter 7.Gathered the current signal of three photosensitive tubes again by multi-channel signal acquiring circuit board 3, signal, through back-end processor process, is sent to monitoring center by wireless base station apparatus simultaneously.
Wherein multi-channel signal acquiring circuit board 3 is connected with 1# photosensitive tube 4,2# photosensitive tube 5 and 3# photosensitive tube 6, and multi-channel signal acquiring plate 3 can gather the signal of 3 photosensitive tubes simultaneously; Ultraviolet source 2 is connected with luminous source optical fiber 12; One end of 1# photosensitive tube 4 is connected with 254nm bandpass filter 8, and the other end of 254nm bandpass filter 8 is connected with 1# signal optical fibre 9; One end of 2# photosensitive tube 5 is connected with 210nm bandpass filter 7, and the other end of 210nm bandpass filter 7 is connected with 2# signal optical fibre 10; The other end of 3# photosensitive tube 6 is directly connected with reference optical fiber; Luminous source optical fiber 12,1# signal optical fibre 9 are connected to detection probe together with 2# signal optical fibre 10, detect.Each signal wire, cable are connected with the external world through water joint 1.
Wherein
(1) ultraviolet source-deuterium lamp 2 operates UV, visible light radiant purchased from the miniature of German Heraeus company, and model is DTM6/10.
(2) photosensitive tube purchases (4,5,6) from German Silicon Sensor International AG company, and model is PC10-2TO5, and wavelength coverage is 200nm-1100nm.
(3) multi-channel signal acquiring circuit board 3 is general amplifying circuit, can low noise, efficiently amplification photosensitive tube nA level electric current.
(4) 210nm bandpass filter 7: centre wavelength 210nm, half-peak breadth 30nm.
(5) 254nm bandpass filter 8: centre wavelength 254nm, half-peak breadth 30nm.
(6) optic module designs according to application demand, and being processed by Nanjing Yi Kuntexian company provides.Optical fiber parameter is as follows:
1# signal optical fibre 9 (3 core fibre core diameters are 400um)
2# signal optical fibre 10 (3 core fibre core diameters are 400um)
Reference optical fiber 11 (1 core fibre core diameter is 100um)
Luminous source optical fiber 12 (3 core fibre core diameters are 400um)
Embodiment 2
Optic module of the present utility model and detection probe, through particular design, make this sensor can with a probe Simultaneously test COD and chemical oxygen demand (COD) two parameters.
Optical fiber design as shown in Figure 2, wherein source ends optic fibre connector 16 is 4 cores, wherein 3 diameters are 400 μm, i.e. luminous source optical fiber 12, luminous source optical fiber connects source ends and detection probe end, provides ultraviolet source to detection probe, a diameter is 100 μm, whether i.e. reference optical fiber 11, is connected to reference light terminal 17, normally work in order to indicate light source; Detection probe end optic fibre connector 19 is 9 cores, diameter is 400 μm, wherein three (i.e. luminous source optical fibers 12) are connected with luminous source optical fiber terminal 16, three (i.e. 1# signal optical fibres 9) are connected with 1# flashlight terminal 18, also have three (i.e. 2# signal optical fibres 10) to be connected with 2# flashlight terminal 15.
The design of detection probe as shown in Figure 3, the ultraviolet light that light source sends is irradiated in water body by luminous source optical fiber 12 and absorbs through water body, after being reflected by catoptron 22, absorb through a water body again, come detection probe optic fibre connector 19 place, unabsorbed ultraviolet light is divided into two-way, leading up to 1# signal optical fibre 9 and 254nm bandpass filter 8 enters 1# photosensitive tube 4, separately leading up to 2# signal optical fibre 10 and 210nm bandpass filter 7 enters 2# photosensitive tube 5, namely 1# photosensitive tube 4 can record the absorbance (sign chemical oxygen demand of water body) of water body at 254nm place, 2# photosensitive tube 5 can record the absorbance (characterize water body nitrate nitrogen concentration) of water body at 210nm place, again according to respective updating formula, chemical oxygen demand (COD) and the nitrate nitrogen concentration of water body can be obtained.
Embodiment 3:
A kind of chemical oxygen demand (COD) of the present embodiment, the application process of nitrate nitrogen content multiparameter on-line monitoring sensor in actual water body detects.Step is as follows:
Step one: calibration sensor
(1) standard water sample of 10 different chemical oxygen demands is prepared with beaker as sample to be tested (concentration range 0.50mg/L)
(2) adopt standard chemical oxygen demand assay method and instrument to measure this 10 samples respectively, obtain the standard value of simple chemical oxygen demand.
(3) sensor of the present utility model is inserted respectively in 10 sample solutions, energising test, the absorbance that record 1# photosensitive tube 4 records, and itself and the matching of simple chemical oxygen demand standard value are set up linear relationship, as shown in Figure 4, obtain updating formula Y
1=358.50966*X
1-31.85428, multiple correlation coefficient is 0.99127, wherein Y
1represent chemical oxygen demand (COD), X
1represent the absorbance measured by 1# photosensitive tube 4.By this updating formula stored in the data processor of rear end, then when measuring, the absorbance X that we just can record according to 1# photosensitive tube
1, directly obtain the chemical oxygen demand (COD) Y of water body
1.
(4) same method has been used for the demarcation to sensor nitrate nitrogen concentration (concentration range 0-10mg/L), namely the absorbance that 2# photosensitive tube 5 records is recorded, and itself and the matching of sample nitrate nitrogen standard value are set up linear relationship, as shown in Figure 5, obtain updating formula Y
2=38.94923*X
2-2.63888, wherein Y
2represent nitrate nitrogen concentration, X
2represent the absorbance measured by 2# photosensitive tube 5.By this updating formula stored in the data processor of rear end, then when measuring, the absorbance X that we just can record according to 2# photosensitive tube
2, directly obtain the chemical oxygen demand (COD) Y of water body
2.To this, we just complete the staking-out work of sensor.
Step 2: actual water sample is tested
(1) this sensor is directly put into water body can test, 3# photosensitive tube 6 survey data whether be used to refer to light source working properly, when light source normally works, its data of surveying are stationary value 30, if find in actual applications 3# photosensitive tube 6 survey data and be less than 30, its display then should stop measuring, check light source, until normally just can continue to measure.
(2) calibrated sensor is put into Suzhou River water sample, test, and record data, the chemical oxygen demand (COD) recording Suzhou river is 23.17mg/L, and nitrate nitrogen concentration is 0.252mg/L.
The measurement range of this sensor chemistry oxygen demand is 0mg/L ~ 50mg/L, and the measurement range of nitrate nitrogen is 0mg/L ~ 7mg/L, meets the detection demand of general water body.
Claims (3)
1. a COD and nitrate nitrogen content two-parameter while on-line monitoring sensor, it is characterized in that the ultraviolet absorptivity method based on Lambert-Beer law, test substance in water is utilized to the characteristic absorption of purple light, to set up the relation of absorbance and test substance concentration; Utilize the chemical oxygen demand (COD) concentration value of the absorbance of water sample at 254nm place and water sample to set up linear relationship, utilize the absorbance of water sample at 210nm place and nitrate nitrogen content to set up linear relationship; Described sensor is made up of five parts:
(1) light source module;
(2) signals collecting and sending module, includes shielded cable, multi-channel signal acquiring circuit board, 1# photosensitive tube, 2# photosensitive tube and 3# photosensitive tube;
(3) optic module, includes 1# signal optical fibre, 2# signal optical fibre, luminous source optical fiber, reference optical fiber, 254nm bandpass filter, 210nm bandpass filter;
(4) detection probe, includes detection probe optic fibre connector, catoptron;
(5) stainless steel casing;
Wherein light source module, signals collecting and sending module, optic module are all encapsulated in stainless steel casing inside, and detection probe reaches outside by the screw hole that stainless steel casing is reserved, are fixed together between probe and shell by water-proof nut; Wavelength as the miniature deuterium lamp of light source module is 200nm-400nm, be coupled by general-purpose interface and luminous source optical fiber as ultraviolet source, reference optical fiber of wherein leading up to directly enters 3# photosensitive tube, as the signal designation whether light source normally works as with reference to light; An other road enters into the detection probe of water sample, through the absorption of water sample, then is reflected back signal optical fibre by catoptron, and a part of reflected light enters 1# signal optical fibre, enters 1# photosensitive tube through 254nm optical filter, in order to detect chemical oxygen demand (COD); Another part reflected light enters 2# signal optical fibre, enters 2# photosensitive tube through 210nm optical filter, in order to detect nitrate nitrogen concentration; Gathered the voltage signal of three photosensitive tubes again by multi-channel signal acquiring circuit board, signal, through back-end processor process, is converted to absorbance, is sent to monitoring center by wireless base station apparatus simultaneously.
2., by sensor according to claim 1, it is characterized in that:
A) the miniature deuterium lamp supply voltage as ultraviolet source is 12V, and power is 6W;
B) signal acquisition module adopts general amplification and Acquisition Circuit module, and the electric signal exported from photosensitive tube amplifies via signal acquisition module, filtering, then delivers to rear end and process;
C) light signal is by Optical Fiber Transmission, and electric signal is transmitted by shielded cable; Described source ends optical fiber is 4 cores, wherein 3 diameters are that the luminous source optical fiber of 400 μm connects source ends and detection probe end, provide ultraviolet source to detection probe, and diameter is that the optical fiber of 100 μm is as with reference to optical fiber, be connected to reference light terminal, whether normally work in order to indicate light source; The optical fiber of detection probe end is 9 cores, and diameter is 400 μm, and wherein three are connected with luminous source optical fiber terminal, three, and namely 1# signal optical fibre is connected with 1# signal optical fibre terminal, and also have three, namely 2# signal optical fibre is connected with 2# signal optical fibre terminal; Thus the light signal come from probe collection be divide into two-way; Achieve and monitor while two wavelength place absorbances;
D) multi-channel signal acquiring circuit board is connected with 1# photosensitive tube, 2# photosensitive tube and 3# photosensitive tube respectively, and multi-channel signal acquiring plate gathers the signal of 3 photosensitive tubes simultaneously; Ultraviolet source is connected with luminous source optical fiber; One end of 1# photosensitive tube is connected with 254nm bandpass filter, and the other end of 254nm bandpass filter is connected with 1# signal optical fibre; One end of 2# photosensitive tube is connected with 210nm bandpass filter, and the other end of 210nm bandpass filter is connected with 2# signal optical fibre; The other end of 3# photosensitive tube is directly connected with reference optical fiber; Luminous source optical fiber, 1# signal optical fibre are connected to detection probe together with 2# signal optical fibre, detect, and each signal wire, cable are connected with the external world through water joint;
E) in detection probe, catoptron detects on light terminal by regulating screw-type design to be fixed on, free adjustment light path, and adopt the ultraviolet reflectance minute surface of high reflectance, whole detection probe stainless steel is made, and directly can insert in water and use;
F) stainless steel casing, each module of sensor is all encapsulated in stainless steel casing, and each signal wire is connected with the external world through water joint with shielded cable, and whole sensor can be placed directly in and use under water.
3., by sensor according to claim 2, it is characterized in that:
(1) as ultraviolet source-miniature deuterium lamp purchased from German Heraeus company, model is DTM6/10;
(2) photosensitive tube is purchased from German Silicon Sensor International AG company, and model is PC10-2TO5, and wavelength coverage is 200nm-1100nm;
(3) multi-channel signal acquiring circuit board is general amplifying circuit, low noise, amplifies photosensitive tube nA level electric current efficiently;
(4) 210nm bandpass filter: centre wavelength 210nm, half-peak breadth 30nm;
(5) 254nm bandpass filter: centre wavelength 254nm, half-peak breadth 30nm;
(6) 1# signal optical fibre is 3 core fibre core diameters is 400 μm;
2# signal optical fibre is 3 core fibre core diameters is 400 μm;
Reference optical fiber is 1 core fibre core diameter is 100 μm;
Luminous source optical fiber is 3 core fibre core diameters is 400 μm.
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| CN104880429A (en) * | 2015-04-23 | 2015-09-02 | 能讯传感技术（上海）有限公司 | Online simultaneous monitoring sensor and online simultaneous monitoring method for COD (Chemical Oxygen Demand) and nitrogen content of nitrate |
| CN105717072A (en) * | 2016-04-14 | 2016-06-29 | 天津视讯云光电科技有限公司 | Transmission type COD (chemical oxygen demand) detection device based on reflecting mirror |
| CN105758825A (en) * | 2016-04-28 | 2016-07-13 | 绍兴文理学院 | Sewage biochemical oxygen demand (BOD) scattering detecting table |
| CN112710747A (en) * | 2020-12-15 | 2021-04-27 | 山东省计量科学研究院 | Method for setting value of chemical oxygen demand standard solution |
| CN112730293A (en) * | 2020-12-28 | 2021-04-30 | 深圳市中科云驰环境科技有限公司 | Ammonia nitrogen water quality monitor and method based on spectrum analysis method |
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2015
- 2015-04-23 CN CN201520253703.5U patent/CN204594872U/en not_active Expired - Fee Related
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| CN104880429A (en) * | 2015-04-23 | 2015-09-02 | 能讯传感技术（上海）有限公司 | Online simultaneous monitoring sensor and online simultaneous monitoring method for COD (Chemical Oxygen Demand) and nitrogen content of nitrate |
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| WO2017177487A1 (en) * | 2016-04-14 | 2017-10-19 | 天津视讯云光电科技有限公司 | Mirror-based transmission-type cod detection apparatus |
| CN105758825A (en) * | 2016-04-28 | 2016-07-13 | 绍兴文理学院 | Sewage biochemical oxygen demand (BOD) scattering detecting table |
| CN112710747A (en) * | 2020-12-15 | 2021-04-27 | 山东省计量科学研究院 | Method for setting value of chemical oxygen demand standard solution |
| CN112710747B (en) * | 2020-12-15 | 2022-08-02 | 山东省计量科学研究院 | Method for setting value of chemical oxygen demand standard solution |
| CN112730293A (en) * | 2020-12-28 | 2021-04-30 | 深圳市中科云驰环境科技有限公司 | Ammonia nitrogen water quality monitor and method based on spectrum analysis method |
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