CN104655194A - Adaptive acquisition method and device for water quality parameter vertical distribution - Google Patents
Adaptive acquisition method and device for water quality parameter vertical distribution Download PDFInfo
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Abstract
The invention discloses an adaptive acquisition method and device for water quality parameter vertical distribution and belongs to the field of water quality monitoring. The device mainly comprises an overwater control system and an underwater water quality acquisition system, wherein the overwater control system comprises a computer terminal, a lifting device control system and a lifting device; the underwater water quality acquisition system comprises an underwater signal processing unit, a water quality sensor unit and a cylindrical pressure-resistant watertight casing. In the process that the lifting device lowers the water quality acquisition system, the computer terminal receives and analyzes change rates of various water quality parameters of a vertical section at a measurement point in real time, and the lowering speed of the water quality acquisition system is adjusted by the lifting device according to the change rates of the water quality parameters, so that change trends of the various water quality parameters of the vertical section are captured in an adaptive manner. According to the adaptive acquisition method and device for water quality parameter vertical distribution, the structure is simple, usage is convenient, the cost is low, automatic measurement can be realized, manpower and material resources are saved, and water source reservoir water quality stratification phenomena can be better captured.
Description
Technical field
The invention belongs to water quality monitoring field, relate to a kind of water quality parameter vertical characteristics self-adaptation acquisition method and device.
Background technology
Water source reservoir is as the job facilities of retaining and water supply, and water quality protection is the key event realizing safety water supply with management.In the operational process of reservoir, water pollution issue is more and more outstanding.After reservoir builds up, the pollutant formed by the biological metabolism deposition etc. in rainfall runoff driving, the effect of human activity, atmospheric sedimentation and reservoir, major part savings, in reservoir, affects water quality.Especially in the Northeast of China, water source reservoir scale is large, and the degree of depth is large, and long operational time, reservoir lower floor water quality deterioration is serious.Observe and find, reservoir ubiquity endogenous pollution problem more than 20 years of operation.Therefore, how to gather representational water quality data, the vertical characteristics situation of investigation water source Reservoir Water Quality, becomes the key of research water quality management countermeasure.
Water quality monitoring is the important means ensureing source water lab environment safety, the major way of water source reservoir water investigation is that scientific research personnel takes advantage of research ship to arrive appointment sampled point collection water quality parameter, and the parameter of measurement mainly comprises the degree of depth, temperature, PH, dissolved oxygen DO, conductivity, oxidation-reduction potential and turbidity etc.The position of different water quality parameters occurrence tendency change on vertical section is different, wants the truth understanding the distribution of water quality vertical section, just needs the variation tendency capturing water quality parameters.Traditional water source reservoir water investigation adopts the method for artificial sample, lab analysis, after scientific research personnel takes advantage of research ship to arrive sampled point, use the hydrophore with scale rope to obtain the water sample of some designated depth, then water sample is taken back laboratory and analyze further to obtain water quality data.This method wants the variation tendency catching each water quality parameter vertical characteristics, will increase the measurement number of sample point, wasting manpower and material resources, and the error of data is also larger.Along with the development of electronic information, microprocessor and computer technology, water quality sensor is used widely day by day at field of environment protection.Therefore, scientific research personnel can use water quality sensor to detect in real time sampled point water sample at the scene.Such as, multi-parameter water quality instrument research ship coordinating winch use German Sea & Sun Microsystems to produce, the equidistant pattern of selected depth is at the uniform velocity put into the water-bed water quality distributed data automatically obtaining vertical section with certain speed from underwater, just can observe water quality data at the scene by connecting notebook computer.But, the position changed due to the parameters of vertical section water quality is different, even if adopt the less equidistant method of spacing can not ensure that the measurement point encrypted is exactly the region that water quality condition changes, therefore, this method can not ensure that the data recorded can catch the variation tendency of water quality parameters preferably, and it is mainly towards marine environment, expensive.
Obviously, existing water source reservoir water quality monitoring method can not provide the true data reflecting water quality parameters vertical characteristics for scientific research personnel.Therefore, be badly in need of providing a kind of with low cost, safe and reliable, measurement point quantity can be reduced as far as possible, use manpower and material resources sparingly, better can catch again acquisition method and the device of water quality parameters vertical characteristics.
Summary of the invention
The present invention is devoted to solve the deficiency that prior art measures water source Reservoir Water Quality vertical characteristics, a kind of with low cost, safe and reliable, water quality vertical characteristics acquisition method of being applicable to water source reservoir and device are provided, realize the water source reservoir water quality parameter vertical distribution water surface to water-bed adaptive online acquisition.
Water source of the present invention reservoir water quality parameter vertical characteristics acquisition method from the water surface to the bottom, transfers water quality acquisition system under water at jacking gear to gather the process of the water quality data of measurement point vertical section, the rate of change of the water quality parameters of the real-time computation and measurement point of terminal, terminal utilizes LabVIEW to develop Reservoir Water Quality ipc monitor interface, water source, by ipc monitor interface setting initialization acquisition parameter, the water quality data of acquisition is shown in real time the variation tendency of each water quality parameter with the form of numerical value and curve, and be stored in SQL database.
Terminal real-time reception the rate of change of water quality parameters on analysis to measure point place vertical section, terminal sends to jacking gear control system the lowering velocity that dependent instruction controls water quality acquisition system under water according to the water quality parameter that rate of change is maximum, carried out the lowering velocity of regulating water quality harvester by jacking gear according to the size of the rate of change of this water quality parameter, the rate of change of water quality parameters and the speed of jacking gear are inversely proportional to, with the variation tendency of adaptive seizure vertical section water quality parameters, complete water quality acquisition system adaptive whole gatherer process from the water surface to the bottom under water,
The present invention realizes the device of water source reservoir water quality parameter vertical characteristics acquisition method, mainly comprise control system waterborne and water quality acquisition system under water, control system waterborne and under water water quality acquisition system are undertaken alternately by data line, one end of data line is connected with control system waterborne, and the other end is connected with water quality acquisition system under water.
Control system waterborne comprises terminal, jacking gear control system and jacking gear, terminal is connected with jacking gear by data line, terminal sends steering order control jacking gear to jacking gear and carries out action, transfers water quality acquisition system under water and gather the water quality data of vertical section from the water surface to the bottom.Terminal utilizes LabVIEW to develop Reservoir Water Quality ipc monitor interface, water source, by ipc monitor interface setting initialization acquisition parameter, primary responsibility controls jacking gear and transfers the speed of water quality acquisition system under water and process the water quality data of water quality acquisition system transmission under water in real time, terminal judges according to the underwater penetration of water quality acquisition system under water, transfers water quality acquisition system under water after starting jacking gear by data line.
Water quality acquisition system is placed in water through jacking gear under water, for obtaining the water quality data of designated depth measurement point, comprises underwater signal processing unit, water quality sensor unit and cylindric withstand voltage watertight case.The sealing of underwater signal processing unit is fixed on the inside of cylindric withstand voltage watertight case, the simulating signal of real-time reception water quality treatment sensor unit 4-20mA, data layout water quality data being packaged into setting is sent to terminal by data line and carries out analyzing and processing, comprises ARM9 processor, multidiameter option switch circuit, signal processing circuit, A/D conversion and RS485 data transmission interface.Underwater signal processing unit selects output signal for the water quality sensor of 4-20mA by multidiameter option switch circuit, through signal processing circuit, the simulating signal of 4-20mA is converted to the voltage signal of 0-5V, changed by A/D and the voltage signal of 0-5V is converted to digital signal, collect the data such as the underwater penetration of water quality acquisition system present position under water, temperature, PH, dissolved oxygen DO, conductivity, oxidation-reduction potential and turbidity respectively.The output of each water quality sensor of water quality sensor unit is the current signal of 4-20mA, output line is connected with underwater signal processing unit, comprise pressure transducer, temperature sensor, PH sensor, dissolved oxygen sensor, conductivity sensor, oxidation-reduction potential sensor, turbidity transducer and height sensor, the bottom that each sensor probe is fixed on cylindric withstand voltage watertight case contacts with detected water sample.The upper end cover of cylindric withstand voltage watertight case is circular, data line is connected with the underwater signal processing unit of enclosure interior by upper end cover, bottom end cover is provided with opening, outside detected water sample enters submergence in housing through opening and contacts each water quality sensor, by underwater signal processing unit, the simulating signal of water quality sensor is converted to digital signal and sends to terminal, upper end cover and bottom end cover together with cylindric pressure-resistant seal housing compact siro spinning technology, reach airtight waterproof respectively.
The water quality parameter vertical characteristics self-adaptation acquisition method that the present invention proposes and device, structure is simple, easy to use, with low cost, after being provided with, without people for operating, can realize automatic measurement, saving manpower and materials.Regulate the lowering velocity of harvester according to the rate of change of water quality parameters simultaneously, realize the self-adaptation online observation of the water surface to water-bed water quality parameter vertical distribution, obtain the water quality distributed data that underwater vertical section is representative, catch water source Reservoir Water Quality lamination better.
Accompanying drawing explanation
Fig. 1 is water source of the present invention reservoir water quality parameter vertical characteristics harvester structural representation.
Fig. 2 is jacking gear schematic diagram of the present invention.
Fig. 3 is lift control system circuit diagram of the present invention.
Fig. 4 is the present invention's water quality acquisition system diagrammatic cross-section under water.
Fig. 5 is the circuit diagram of water quality signal processing unit of the present invention.
Fig. 6 is the process flow diagram of water source of the present invention reservoir water quality parameter vertical characteristics self-adaptation acquisition method.
In figure: 1 terminal; 2 data lines; 3 jacking gear signal control lines; 4 jacking gear control system; 5 jacking gears; 6 water quality acquisition systems; 7 signal input unit; 8 signal transmission units; 9STC51 single-chip microcomputer; 10 direct supplys; 11 buffer circuits; 12 driving circuits; 13 rotary speed detecting signal feedbacks; 14 motor; 15 signal processing units; 16A/D changes; 17 switch selection circuit; 18ARM9 processor; 19 optical coupling isolation circuits; 20 power supplys; 21RS485 communication interface;
5-1 motor; 5-2 motor shaft; 5-3 fixed pulley;
6-1 watertight interface; 6-2 upper end cover; 6-3 housing; 6-4 pressure transducer; 6-5 temperature sensor; 6-6PH sensor; 6-7 dissolved oxygen sensor; 6-8 conductivity sensor; 6-9 oxidation-reduction potential sensor; 6-10 turbidity transducer; 6-11 bottom end cover.
Embodiment
Be illustrated in figure 1 water source of the present invention reservoir water quality parameter vertical characteristics harvester structural representation, mainly comprise control system waterborne and water quality acquisition system 6 under water, control system waterborne and under water water quality acquisition system 6 are undertaken alternately by data line 2, data line 2 is wrapped on jacking gear 5, one end is connected with control system waterborne, and the other end is connected with water quality acquisition system 6 under water.
Control system waterborne comprises terminal 1, jacking gear control system 3 and jacking gear 5, terminal 1 is connected with jacking gear control system 4 by jacking gear signal control line 3, jacking gear control system 4 controls the underwater penetration of water quality acquisition system 6 under water by changing data line 2 length entered in water, terminal 1 sends steering order control jacking gear 5 to jacking gear control system 4 and carries out action, transfers water quality acquisition system 6 under water gather the water quality data of vertical section with certain speed from the water surface to the bottom.Terminal 1 primary responsibility controls jacking gear 5 and transfers the speed of water quality acquisition system under water and process the water quality data of water quality acquisition system 6 transmission under water in real time, terminal 1 is according to the underwater penetration of water quality acquisition system 6 under water and judge apart from the water-bed degree of depth, send to jacking gear control system 4 startup and the stopping that dependent instruction controls jacking gear 5, pass through data line 2 after starting jacking gear 5 with certain rate discharge water quality acquisition system 6 under water.
Be illustrated in figure 2 jacking gear schematic diagram of the present invention, mainly comprise motor 5-1, motor shaft 5-2 and fixed pulley 5-3.Water quality acquisition system 6 is wrapped on fixed pulley 5-3 by signal transmssion line 2 under water, and fixed pulley 5-3 is connected with the motor shaft 5-2 of motor 5-1, and motor 5-1 drives fixed pulley 5-3 to control the underwater penetration of water quality acquisition system 6 under water by motor shaft 5-2.
If Fig. 3 is lift control system circuit diagram, mainly comprise signal input unit 7, signal transmission unit 8, STC51 single-chip microcomputer 9, direct supply 10, buffer circuit 11, driving circuit 12, rotary speed detecting signal feedback 13 and motor 14.After terminal 1 gives STC51 single-chip microcomputer input signal by jacking gear signal control line 3, signal input unit 7 sends the signal that terminal 1 inputs to STC51 single-chip microcomputer 9, after STC51 single-chip microcomputer 9 receives signal, control the speed of motor through buffer circuit 11 and driving circuit 12, and pass through the speed of the real-time detection motor of rotary speed detecting signal feedback unit.When transfer under water by water quality acquisition system 6 for the different speeds control of needs, terminal 1 just can input different signals, to control the speed of motor to STC51 single-chip microcomputer by signal input unit 7.
Be illustrated in figure 4 water quality acquisition system diagrammatic cross-section under water, water quality acquisition system 6 is placed in water through jacking gear 5 under water, for obtaining the water quality data of designated depth measurement point, comprise watertight interface 6-1, upper end cover 6-2, housing 6-3, pressure transducer 6-4, temperature sensor 6-5, PH sensor 6-6, dissolved oxygen sensor 6-7, conductivity sensor 6-8, oxidation-reduction potential sensor 6-9, turbidity transducer 6-10 and bottom end cover 6-11.The output of each water quality sensor of water quality sensor unit is the current signal of 4-20mA, output line is connected with underwater signal processing unit, comprise pressure transducer 6-4, temperature sensor 6-5, PH sensor 6-6, dissolved oxygen sensor 6-7, conductivity sensor 6-8, oxidation-reduction potential sensor 6-9 and turbidity transducer 6-10, the bottom that each sensor probe is fixed on cylindric withstand voltage watertight case bottom end cover 6-11 contacts with detected water sample.The upper end cover 6-2 of cylindric withstand voltage watertight case is circular, data line 2 is connected with the underwater signal processing unit of enclosure interior by the watertight interface 6-1 of upper end cover 6-2, bottom end cover 6-11 is provided with opening, outside detected water sample enters submergence in housing through opening and contacts each water quality sensor, by underwater signal processing unit, the simulating signal of water quality sensor is converted to digital signal and sends to terminal 1, upper end cover 6-2 and bottom end cover 6-11 together with cylindric pressure-resistant seal housing compact siro spinning technology, reach airtight waterproof respectively.
As the circuit diagram that Fig. 5 is water quality signal processing unit, the sealing of underwater signal processing unit is fixed on the inside of cylindric withstand voltage watertight case, the simulating signal of real-time reception water quality treatment sensor unit 4-20mA, data layout water quality data being packaged into setting is sent to terminal 1 by data line 2 and carries out analyzing and processing, comprise ARM9 processor 18, signal processing circuit 15, A/D conversion 16, multidiameter option switch circuit 17, photoelectric isolating circuit 19, power supply 20 and RS485 data transmission interface 21.Underwater signal processing unit selects output signal for the water quality sensor of 4-20mA by multidiameter option switch circuit 17, through signal processing circuit 15, the simulating signal of 4-20mA is converted to the voltage signal of 0-5V, change 16 by A/D and the voltage signal of 0-5V is converted to digital signal, collect the data such as the underwater penetration of water quality acquisition system present position under water, temperature, PH, dissolved oxygen DO, conductivity, oxidation-reduction potential and turbidity respectively.
Water source of the present invention reservoir water quality parameter vertical characteristics acquisition method is, from the water surface to the bottom, transfer water quality acquisition system 6 under water by jacking gear 5 and gather the water quality data of measurement point vertical section, in order to catch the variation tendency of water quality parameters different on vertical section at different depth, transfer in the process of water quality acquisition system 6 under water at jacking gear 5, terminal 1 utilizes LabVIEW to develop Reservoir Water Quality ipc monitor interface, water source, by ipc monitor interface setting initialization acquisition parameter, the water quality data of acquisition is shown in real time the variation tendency of each water quality parameter with the form of numerical value and curve, and be stored in SQL database.The rate of change of the water quality parameters of the real-time computation and measurement point of terminal 1, terminal 1 sends to jacking gear control system 4 lowering velocity that dependent instruction controls water quality acquisition system 6 under water according to the water quality parameter that rate of change is maximum, and to make, water quality acquisition system 6 is under water adaptive from the water surface to the bottom completes whole gatherer process.
Terminal 1 real-time reception the rate of change of water quality parameters on analysis to measure point place vertical section, the maximum water quality parameter of rate of change is selected in the different degree of depth, the lowering velocity of regulating water quality harvester 6 is carried out by jacking gear 5, with the variation tendency of adaptive seizure vertical section water quality parameters according to the size of the rate of change of this water quality parameter.
The rate of change of water quality parameters and the speed of jacking gear are inversely proportional to.When the rate of change of water quality parameters is less, jacking gear 5, with larger rate discharge water quality acquisition system 6 under water, reduces measurement point number; When the rate of change of water quality parameters is larger, jacking gear 5 reduces the speed transferring water quality acquisition system 6 under water, increases measurement point number; In the different degree of depth, jacking gear 5 regulates water quality acquisition system 6 under water according to the rate of change of different water quality parameters, to capture the place that each water quality parameter trend of vertical section changes, reflect water source reservoir vertical section water quality distribution truth better.
The key step of the process flow diagram open fire source Reservoir Water Quality vertical characteristics acquisition method of composition graphs 6 water source reservoir water quality parameter vertical characteristics self-adaptation acquisition method:
In step S400, start to measure.In step S401, the host computer interface according to terminal exploitation arranges initiation parameter, main setting lowering velocity V, interval time T and the rate of change controlling value S of each water-quality guideline.
In step S402, after water quality acquisition system 6 fully contacts with water surface top layer under water, start to gather water quality data, terminal 1 gives an order startup jacking gear 5 with certain rate discharge water quality acquisition system 6 under water by jacking gear signal control line 3 to jacking gear control system 4.
In step S403, terminal 1 reads the water quality data that water quality acquisition system 6 under water gathers in real time, and using the position on water surface top layer residing for water quality acquisition system 6 under water as first sampled point k.
In step S404, after first sampled point data acquisition, whether terminal 1 real-time judge under water water quality acquisition system 6 touches the end, if do not touch the end, in step S405, terminal 1 sends control command makes jacking gear 5 produce action continuation with current rate discharge water quality acquisition system 6 under water, and in step S306 Real-time Collection water quality data.When to T interval time, water quality acquisition system 6 arrives the water quality data that second sampled point gathers this point under water, gathers the water quality data of k sampled point successively, obtains the rate of change Sk of the water quality parameters of a kth sampled point according to least square fitting.
In step S407, when arriving kth+1 sampled point, according to least square fitting the 2nd point to kth+1 point, obtain the rate of change Sk+1 of the water quality parameters of kth+1 sampled point, now calculate the rate of change of each parameter of water quality, obtain the absolute value of the difference of the rate of change Sk of the rate of change Sk+1 of the water quality parameters of kth+1 sampled point and the water quality parameters of a kth sampled point, select the water quality parameter that rate of change is maximum, compare in step S408 and the threshold values preset, and judge whether to be greater than default threshold values in step S409, when the rate of change of this water quality parameter is greater than rate of change controlling value S, in step S410, terminal is given an order to jacking gear, reduce the speed transferring water quality acquisition system under water, increase measurement point number, when the rate of change of this water quality parameter is less than rate of change controlling value S, in step S411, continue with this rate discharge water quality acquisition system 6 under water.
In step S412, judgement is that enough collections terminate, if do not terminated, then repeats step S404 ~ S412, regulates lowering velocity to complete the water quality data collection of all measurement points in real time according to the rate of change of measurement point water-quality guideline.
After collection terminates, in step S413, terminal 1 controls water quality acquisition system 6 under jacking gear 5 recycle-water.Be that sequence arranges measurement point in step S414 with the depth of water, and in step S415, the vertical characteristics data that spline interpolation obtains Reservoir Water Quality carried out to all measurement points.
Claims (4)
1. a water quality parameter vertical characteristics self-adaptation acquisition method, is characterized in that:
From the water surface to the bottom, transferring water quality acquisition system under water at jacking gear gathers in the process of the water quality data of measurement point vertical section, the rate of change of the water quality parameters of the real-time computation and measurement point of terminal, terminal utilizes LabVIEW to develop Reservoir Water Quality ipc monitor interface, water source, by ipc monitor interface setting initialization acquisition parameter, the water quality data of acquisition is shown in real time the variation tendency of each water quality parameter with the form of numerical value and curve, and be stored in SQL database;
Terminal real-time reception the rate of change of water quality parameters on analysis to measure point place vertical section, terminal sends to jacking gear control system the lowering velocity that dependent instruction controls water quality acquisition system under water according to the water quality parameter that rate of change is maximum, carried out the lowering velocity of regulating water quality harvester by jacking gear according to the size of the rate of change of this water quality parameter, the rate of change of water quality parameters and the speed of jacking gear are inversely proportional to, with the variation tendency of adaptive seizure vertical section water quality parameters, complete water quality acquisition system adaptive whole gatherer process from the water surface to the bottom under water.
2. a kind of water quality parameter vertical characteristics self-adaptation acquisition method according to claim 1, is characterized in that:
(1) initiation parameter is set according to the host computer interface of terminal exploitation, main setting lowering velocity V, interval time T and the rate of change controlling value S of each water-quality guideline;
(2) after water quality acquisition system fully contacts with water surface top layer under water, start to gather water quality data, terminal by jacking gear signal control line to jacking gear control system give an order start jacking gear transfer water quality acquisition system under water; Terminal reads the water quality data that water quality acquisition system under water gathers in real time, and using the position on water surface top layer residing for water quality acquisition system under water as first sampled point k;
(3) after first sampled point data acquisition, whether terminal real-time judge under water water quality acquisition system touches the end, if do not touch the end, terminal sends control command makes jacking gear produce action continuation with current rate discharge water quality acquisition system under water, and Real-time Collection water quality data; When to T interval time, water quality acquisition system arrives the water quality data that second sampled point gathers this point under water, gathers the water quality data of k sampled point successively, obtains the rate of change Sk of the water quality parameters of a kth sampled point according to least square fitting;
(4) when arriving kth+1 sampled point, according to least square fitting the 2nd point to kth+1 point, obtain the rate of change Sk+1 of the water quality parameters of kth+1 sampled point, now calculate the rate of change of each parameter of water quality, obtain the absolute value of the difference of the rate of change Sk of the rate of change Sk+1 of the water quality parameters of kth+1 sampled point and the water quality parameters of a kth sampled point, select the water quality parameter that rate of change is maximum; Judge whether to be greater than default threshold values, when the rate of change of this water quality parameter is greater than rate of change controlling value S, terminal is given an order to jacking gear, reduces the speed transferring water quality acquisition system under water, increases measurement point number; When the rate of change of this water quality parameter is less than rate of change controlling value S, continue with this rate discharge water quality acquisition system under water;
(5) judge it is that enough collections terminate, if do not terminated, then repeat step above-mentioned steps, regulate lowering velocity to complete the water quality data collection of all measurement points in real time according to the rate of change of measurement point water-quality guideline; After collection terminates, water quality acquisition system 6 under terminal control jacking gear recycle-water; Be that sequence arranges measurement point with the depth of water, and the vertical characteristics data that spline interpolation obtains Reservoir Water Quality are carried out to all measurement points.
3. for the device of the water quality parameter vertical characteristics self-adaptation acquisition method described in claim 1 or 2, it is characterized in that, described device comprises control system waterborne and water quality acquisition system under water, control system waterborne and under water water quality acquisition system are undertaken alternately by data line, one end of data line is connected with control system waterborne, and the other end is connected with water quality acquisition system under water;
Control system waterborne comprises terminal, jacking gear control system and jacking gear, terminal is connected with jacking gear by data line, terminal sends steering order control jacking gear to jacking gear and carries out action, transfers water quality acquisition system under water and gather the water quality data of vertical section from the water surface to the bottom; Terminal utilizes LabVIEW to develop Reservoir Water Quality ipc monitor interface, water source, by ipc monitor interface setting initialization acquisition parameter, primary responsibility controls jacking gear and transfers the speed of water quality acquisition system under water and process the water quality data of water quality acquisition system transmission under water in real time, terminal judges according to the underwater penetration of water quality acquisition system under water, transfers water quality acquisition system under water after starting jacking gear by data line;
Water quality acquisition system is placed in water through jacking gear under water, for obtaining the water quality data of designated depth measurement point, comprises underwater signal processing unit, water quality sensor unit and cylindric withstand voltage watertight case; The sealing of underwater signal processing unit is fixed on the inside of cylindric withstand voltage watertight case, the simulating signal of real-time reception water quality treatment sensor unit 4-20mA, data layout water quality data being packaged into setting is sent to terminal by data line and carries out analyzing and processing, comprises ARM9 processor, multidiameter option switch circuit, signal processing circuit, A/D conversion and RS485 data transmission interface; Underwater signal processing unit selects output signal for the water quality sensor of 4-20mA by multidiameter option switch circuit, through signal processing circuit, the simulating signal of 4-20mA is converted to the voltage signal of 0-5V, changed by A/D and the voltage signal of 0-5V is converted to digital signal, collect the data such as the underwater penetration of water quality acquisition system present position under water, temperature, PH, dissolved oxygen DO, conductivity, oxidation-reduction potential and turbidity respectively; The output of each water quality sensor of water quality sensor unit is the current signal of 4-20mA, output line is connected with underwater signal processing unit, comprise pressure transducer, temperature sensor, PH sensor, dissolved oxygen sensor, conductivity sensor, oxidation-reduction potential sensor, turbidity transducer and height sensor, the bottom that each sensor probe is fixed on cylindric withstand voltage watertight case contacts with detected water sample; The upper end cover of cylindric withstand voltage watertight case is circular, data line is connected with the underwater signal processing unit of enclosure interior by upper end cover, bottom end cover is provided with opening, outside detected water sample enters submergence in housing through opening and contacts each water quality sensor, by underwater signal processing unit, the simulating signal of water quality sensor is converted to digital signal and sends to terminal, upper end cover and bottom end cover together with cylindric pressure-resistant seal housing compact siro spinning technology, reach airtight waterproof respectively.
4. device according to claim 3, is characterized in that adopting the jacking gear of motor composition to drive fixed pulley to control the lowering velocity of water quality acquisition system under water.
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