CN102445417B - Integrated dissolved oxygen analyzer and method - Google Patents
Integrated dissolved oxygen analyzer and method Download PDFInfo
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- CN102445417B CN102445417B CN201110356406.XA CN201110356406A CN102445417B CN 102445417 B CN102445417 B CN 102445417B CN 201110356406 A CN201110356406 A CN 201110356406A CN 102445417 B CN102445417 B CN 102445417B
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Abstract
The invention discloses an integrated dissolved oxygen analyzer and a method. The analyzer comprises probe, sensing and control parts. The method provided in the invention comprises the following steps of: submerging the probe part which is provided with an optical device as the main body thereof in water, performing a series of conversion processing and then transmitting an electric signal obtained through conversion to the main body part; and performing the courses of correction, conversion, processing and the like on the signal transmitted from the probe part, and completing communication with the control part. Besides, the sensing part is designed with two acquisition and conversion manners which can be also multiplexed. The integrated dissolved oxygen analyzer has the advantages of small volume, high integration level, low power consumption, low cost, good adaptability to multi-point networking and the like, and also has complete functions and rich interfaces; therefore, the integrated dissolved oxygen analyzer is completely capable of meeting the requirements of dissolved oxygen content and temperature detection in water under complex conditions.
Description
Technical field
The present invention relates to a kind of design and method of integral type dissolved oxygen analysis instrument apparatus, can be used for Water quality and detect, complete the flexible Measurement accuracy to content of oxygen dissolved in water and temperature.
Background technology
Dissolved oxygen DO, as an important water-quality guideline, no matter in water quality assessment or in scientific research, all has vital role.How accurately, Fast Continuous Determination dissolved oxygen concentration is the important topic of analytical chemistry always.Therefore first the method for using chemical theory and means to carry out dissolved oxygen DO detection occurs at chemical field, and these class methods is called to chemical method.And along with the development of other subject technology, each subject mutually combine and derivative instrumental method because its feature such as fast and convenient becomes the focus of dissolved oxygen concentration detection field in recent years gradually.
The method of traditional measurement DO mainly contains iodimetric titration, current method and conductance method at present.Traditional measurement method, due to its inherent structure and analytical approach, exists a lot of defects.Domestic some units in recent years and research institution have developed some small-sized dissolved oxygen DO detectors (dissolved oxygen instrument), and these dissolved oxygen instruments are based on galvanometry mostly.And the main flow that dissolved oxygen instrument develops in the world is at present the fiber optic dissolved oxygen sensor that adopts fluorescence method.
Fluorescence method dissolved oxygen instrument is the quenching principle to active fluoro based on predetermined substance in physics.Fluorescence method is measured DO higher measuring accuracy and antijamming capability, adopts the dissolved oxygen instrument of its method to have good repeatability and stability.Current, the producer of domestic research and development fluorescence method dissolved oxygen DO is little, and product quality is all undesirable, substantially all relies in import brand so relate to the project of fluorescence method dissolved oxygen DO buying.But because import brand is expensive, domestic a lot of users are still using embrane method dissolved oxygen DO now.Based on the plurality of advantages of fluorescence method dissolved oxygen meter, be easy to be subject to demestic user's accreditation, and no matter dissolved oxygen DO is in commercial production, environmental monitoring, or be again a requisite monitoring parameter in wastewater treatment, so it is to be developed that fluorescence method dissolved oxygen DO has very large market to have at home, and will the effect escorting be played in the fields such as commercial production, environmental monitoring, wastewater treatment.
Summary of the invention
Technology of the present invention is dealt with problems and is: can overcome existing membrane structure dissolved oxygen meter later maintenance cost large, the unstable deficiency that waits of measurement performance.Improve the accuracy of detection of content of oxygen dissolved in water, reduce the interference that extraneous factor is measured content of oxygen dissolved in water, compared with traditional dissolved oxygen sensing method, in the method 1 year without calibration, later maintenance workload is less, not limited by water volume flow rate, and measurement result is stable.And the structural design of integral type, make that probe and the volume of main part reduce greatly, cost, integrated level raising and be suitable for the advantages such as multiple spot networking.
Technical solution of the present invention is: a kind of design and method of integral type dissolved oxygen analysis instrument apparatus, its feature is to comprise the following steps:
(1), in order to improve the accuracy of detection of content of oxygen dissolved in water, the present invention has adopted the content of fluorescence measurement amount oxygen in water.Thereby it is higher than traditional measurement method precision to obtain one, also more stable new-type dissolved oxygen sensing method, the fine deficiency that makes up traditional measurement method.
(2) probe segment forms (as shown in Figure 2) by devices such as extraordinary plated film (containing extraordinary fluorescent material), light signal generating LED, lens, photoelectrical coupler and temperature sensors.Blue led produces blue light under the control of transducing part, through exciting of extraordinary plated film (containing extraordinary fluorescent material), inspires ruddiness; Simultaneously red LED is sent ruddiness, and the reflection through extraordinary plated film with intensity, as with reference to ruddiness.In the water that contains variable concentrations oxygen, the red light intensity difference that the fluorescent material containing in extraordinary plated film excites, then with reference to ruddiness simultaneously by refraction and the filtration of special lenses, enter photoelectrical coupler, convert the main part that electric signal is sent to dissolved oxygen meter to and process.In addition, the electric signal that water temperature also obtains after temperature sensor measurement reaches main part.
(3) answer the demand of data processing speed, the transducing part of dissolved oxygen meter adopt there are 32 fixed points, powerful dsp chip TMS320F2812, and provide a series of peripherals, comprise multichannel AD modular converter, there is sampling and keep function, meet system requirements.
Transducing part mainly comprises that the control of clock generator, multiple memory module, multiple communication module, iic bus module, demonstration and warning circuit, power circuit, reset, signal correction, signal and conversion and some extend out the parts (as shown in Figure 3) such as interface, wherein, clock generator is to produce the clock of characteristic frequency for subsequent conditioning circuit; Multiple memory module comprises EEPROM, SRAM etc., when allowing circuit operation, related data is stored at any time; Bus module has timesharing, obtains reasonably arbitration simultaneously and distribute can make so multiple equipment apply for bus time; Display circuit can allow the demonstration of the visual result moving in circuit; Warning circuit can be specific moment prompting user; Power circuit is mainly responsible for transducing part lasting reliable power supply supply is provided; Reset circuit makes circuit initialization; The correction of signal is that the signal obtaining from probe circuit is carried out to pre-service and then be input to conversion chip processing; The control of signal is the emphasis of transducing part with conversion, the electric signal that thermal signal and light signal obtain after probe Collect conversion, then can be input to master controller through transducing part data after treatment, thus obtain oxygen concentration and the temperature of water body.
(4) controller master chip adopts the M3062LFGPGP in auspicious Sa M16C/62P series, mainly completes and the communicating by letter and relevant order control of sensing circuit and other peripheral circuit, and a series of peripherals is provided, and system works is stable.Controller part master chip adopts the M3062LFGPGP in auspicious Sa M16C/62P series, completes and the communicating by letter and relevant order control of probe circuit, other peripheral circuit.Main circuit will comprise power circuit, controller holding circuit, multiple communication module, the outer temperature survey of water, Data Flash, key-press input and liquid crystal display circuit; Perpetual calendar timing module; Software and hardware resets; The several parts of iic bus module, anti-clutter circuit and expanded circuit (as shown in Figure 4).Wherein, power circuit comprises power-supplying circuit and voltage conversion circuit, mainly completes the needed voltage of controller part and supplies with, and meets the work required voltage of the relevant components and parts of controller part; Controller holding circuit mainly comprises relay protection circuit; Multiple communication module comprise usb communication, serial communication, network interface communication and with the communicating by letter of sensing circuit, infrared module etc., infrared module is by MCP2150 master control, TFDU5107 is as the circuit module of signals collecting, these communication modules mainly complete controller part and probe segment and and third party software between data communication; The outer temperature survey of water is the temperature of measuring current air; DataFlash can say that the data of operation deposit at any time; Keyboard input module is the operation interface of artificial input of control commands, and liquid crystal display circuit can show the information such as surveyed water temperature and oxygen concentration; Perpetual calendar module is that perpetual calendar is integrated in package unit, the grasp to the time when convenient trip; Software and hardware resets provides system under different situations can recover in time initialization; Bus module has timesharing, obtains reasonably arbitration simultaneously and distribute can make so multiple equipment apply for bus time; Anti-clutter circuit is mainly responsible for the circuit reliability guarantee of controller circuitry, and protection controller partial circuit can be worked normally.
(5) integral type dissolved oxygen meter provides a large amount of data-interface structures that can carry out with the external world exchanges data, as RS232, RS485, USB, network interface, infrared etc., convenient data is incorporated to other networks fast; Also have in addition iic bus structure, facilitated the time-sharing work of different slaves; CAN bus completes the framing processing to communication data, and makes node number in network unrestricted in theory etc.Volume of the present invention is little, low in energy consumption, cost is low, and multiple functional, rich interface, can meet the requirement of complex condition content of oxygen dissolved in water and temperature detection completely.
The present invention's advantage is compared with prior art: the content that has adopted fluorescence measurement amount oxygen in water.Compared with the dissolved oxygen meter of traditional membrane structure, in the method 1 year, without calibration, later maintenance workload is less, not limited by water volume flow rate, and measurement result is stable.On this basis, by measurement excite ruddiness duration, excite ruddiness with reference to the phase differential of ruddiness and excite the content of the fluorescence measurement amount oxygen in water that three kinds of methods of red light wavelength merge, obtain a kind of higher than above-mentioned any single-measurement method precision, also more stable new-type combination dissolved oxygen sensing method, the fine deficiency of three kinds of methods in the time of independent measurement that made up.Integral type dissolved oxygen meter volume is little, low in energy consumption, cost is low, and integrated level is high and multiple functional, rich interface, can meet the requirement of complex condition content of oxygen dissolved in water and temperature detection completely.
Brief description of the drawings
Fig. 1 is integral type dissolved oxygen analytic instrument overall design drawing;
Fig. 2 is probe overall design drawing;
Fig. 3 is sensing overall design drawing;
Fig. 4 is control section overall design drawing;
Fig. 5 is the relation of firing time and oxygen concentration;
Specific embodiments
Below in conjunction with accompanying drawing, the technical scheme of invention is elaborated:
As shown in Figure 1, a kind of design and method of integral type dissolved oxygen analysis instrument apparatus, its feature is to comprise the following steps:
(1), in order to improve the accuracy of detection of content of oxygen dissolved in water, the present invention has adopted the content of fluorescence measurement amount oxygen in water.Thereby it is higher than traditional measurement method precision to obtain one, also more stable new-type dissolved oxygen sensing method, the fine deficiency that makes up traditional measurement method.
(2) probe segment forms (as shown in Figure 2) by devices such as extraordinary plated film (containing extraordinary fluorescent material), light signal generating LED, lens, photoelectrical coupler and temperature sensors.Blue led produces blue light under the control of transducing part, through exciting of extraordinary plated film (containing extraordinary fluorescent material), inspires ruddiness; Simultaneously red LED is sent ruddiness, and the reflection through extraordinary plated film with intensity, as with reference to ruddiness.In the water that contains variable concentrations oxygen, the red light intensity difference that the fluorescent material containing in extraordinary plated film excites, then with reference to ruddiness simultaneously by refraction and the filtration of special lenses, enter photoelectrical coupler, convert the main part that electric signal is sent to dissolved oxygen meter to and process.In addition, the electric signal that water temperature also obtains after temperature sensor measurement reaches main part.
(3) answer the demand of data processing speed, the transducing part of dissolved oxygen meter adopt there are 32 fixed points, powerful dsp chip TMS320F2812, and provide a series of peripherals, comprise multichannel AD modular converter, there is sampling and keep function, meet system requirements.
Transducing part mainly comprises that the control of clock generator, multiple memory module, multiple communication module, iic bus module, demonstration and warning circuit, power circuit, reset, signal correction, signal and conversion and some extend out the parts (as shown in Figure 3) such as interface, wherein, clock generator is to produce the clock of characteristic frequency for subsequent conditioning circuit; Multiple memory module comprises EEPROM, SRAM etc., when allowing circuit operation, related data is stored at any time; Bus module has timesharing, obtains reasonably arbitration simultaneously and distribute can make so multiple equipment apply for bus time; Display circuit can allow the demonstration of the visual result moving in circuit; Warning circuit can be specific moment prompting user; Power circuit is mainly responsible for transducing part lasting reliable power supply supply is provided; Reset circuit makes circuit initialization; The correction of signal is that the signal obtaining from probe circuit is carried out to pre-service and then be input to conversion chip processing; The control of signal is the emphasis of transducing part with conversion, the electric signal that thermal signal and light signal obtain after probe Collect conversion, then can be input to master controller through transducing part data after treatment, thus obtain oxygen concentration and the temperature of water body.
(4) controller master chip adopts the M3062LFGPGP in auspicious Sa M16C/62P series, mainly completes and the communicating by letter and relevant order control of sensing circuit and other peripheral circuit, and a series of peripherals is provided, and system works is stable.Controller part master chip adopts the M3062LFGPGP in auspicious Sa M16C/62P series, completes and the communicating by letter and relevant order control of probe circuit, other peripheral circuit.Main circuit will comprise power circuit, controller holding circuit, multiple communication module, the outer temperature survey of water, Data Flash, key-press input and liquid crystal display circuit; Perpetual calendar timing module; Software and hardware resets; The several parts of iic bus module, anti-clutter circuit and expanded circuit (as shown in Figure 4).Wherein, power circuit comprises power-supplying circuit and voltage conversion circuit, mainly completes the needed voltage of controller part and supplies with, and meets the work required voltage of the relevant components and parts of controller part; Controller holding circuit mainly comprises relay protection circuit; Multiple communication module comprise usb communication, serial communication, network interface communication and with the communicating by letter of sensing circuit, infrared module etc., infrared module is by MCP2150 master control, TFDU5107 is as the circuit module of signals collecting, these communication modules mainly complete controller part and probe segment and and third party software between data communication; The outer temperature survey of water is the temperature of measuring current air; DataFlash can say that the data of operation deposit at any time; Keyboard input module is the operation interface of artificial input of control commands, and liquid crystal display circuit can show the information such as surveyed water temperature and oxygen concentration; Perpetual calendar module is that perpetual calendar is integrated in package unit, the grasp to the time when convenient trip; Software and hardware resets provides system under different situations can recover in time initialization; Bus module has timesharing, obtains reasonably arbitration simultaneously and distribute can make so multiple equipment apply for bus time; Anti-clutter circuit is mainly responsible for the circuit reliability guarantee of controller circuitry, and protection controller partial circuit can be worked normally.
(5) integral type dissolved oxygen meter provides a large amount of data-interface structures that can carry out with the external world exchanges data, as RS232, RS485, USB, network interface, infrared etc., convenient data is incorporated to other networks fast; Also have in addition iic bus structure, facilitated the time-sharing work of different slaves; CAN bus completes the framing processing to communication data, and makes node number in network unrestricted in theory etc.Volume of the present invention is little, low in energy consumption, cost is low, and multiple functional, rich interface, can meet the requirement of complex condition content of oxygen dissolved in water and temperature detection completely.
As accompanying drawing 2, in the time that probe segment pulls the plug, blue led sends blue light under the control of sensing circuit, and blue light illumination, on plated film, inspires ruddiness under the effect of fluorescent material.In the different water body of oxygen level, the red light intensity difference that the fluorescence mass-energy containing in plated film excites blue light.Simultaneously, red LED is also under the control of sensing circuit, with blue led red-emitting simultaneously, obtain the ruddiness of same intensity through the reflection of fluorescent material, the ruddiness that this beam intensity does not decay is as with reference to light, with above-mentioned refraction and the filtration that excites ruddiness to pass through special lenses simultaneously, then through photoelectrical coupler, convert electric signal to and be sent to transducing part and process.
Two bundle ruddiness enter Sensor section simultaneously, and as shown in Figure 3, the pre-service links such as the filtering of process signal, correction, amplification, to signal processing.Two bundle ruddiness are due to mechanism of production difference, so have phase differential, principle as shown in Figure 5, uses three methods to merge, and by comparing with inner calibration value, calculates the concentration of oxygen molecule.Signal processing links is all carried out at the Sensor section of accompanying drawing 3, has designed two kinds of different hardware implementation structures here, can select one according to different situations.Meanwhile, temperature sensor also converts the thermal signal recording to electric signal and is sent to sensing circuit and processes.The above is one-period, and same process recurs some cycles, records water body oxygen content and temperature until stable.
Data after treatment can communicate with control circuit, and as shown in Figure 4, control circuit feeds back, shows and other relevant operation according to the data that transmit.Control circuit can connect host computer or other network in addition, communicates or multiple spot networking etc.
The content not being described in detail in instructions of the present invention belongs to the prior art that professional and technical personnel in the field know altogether.
Claims (3)
1. an integral type dissolved oxygen analytic instrument, is characterized in that comprising probe and main body, and wherein main body comprises again sensing circuit and control circuit, and probe is communicated by letter with control circuit by sensing circuit; Described sensing circuit comprises control and the conversion of clock generator, memory module, multiple communication module, iic bus module, demonstration and warning circuit, power circuit, reset, signal correction, signal and extends out interface section, wherein, clock generator is to produce the clock of characteristic frequency for subsequent conditioning circuit; When storage mould moves by circuit, related data is stored at any time; Iic bus module has timesharing, obtains reasonably arbitration simultaneously and distribute while making multiple equipment apply for bus; The result of moving in display circuit display circuit; Warning circuit is specific moment prompting user; Power circuit is mainly responsible for sensing circuit lasting power supply supply is provided; Reset circuit makes sensing circuit initialization; The correction of signal is that the signal obtaining from probe circuit is carried out to pre-service and then be input to conversion chip processing; The control of signal is the emphasis of sensing circuit with conversion, the electric signal that thermal signal and light signal obtain after probe Collect conversion, then be input to control circuit through sensing circuit data after treatment, thus obtain oxygen concentration and the temperature of water body;
Described probe is made up of LED, lens, photoelectrical coupler and the temperature sensor of the plated film that contains extraordinary fluorescent material, the LED that produces red light signal and generation blue light signal, blue led produces blue light under the control of sensing circuit, through exciting of extraordinary plated film, inspire ruddiness; Simultaneously red LED is sent ruddiness, and the reflection through extraordinary plated film with intensity, as with reference to ruddiness; In the water that contains variable concentrations oxygen, the red light intensity difference that the fluorescent material containing in extraordinary plated film excites, then with reference to simultaneously refraction and the filtration of scioptics of ruddiness, enter photoelectrical coupler, convert electric signal to and be sent to the sensing circuit of integral type dissolved oxygen analytic instrument;
Described control circuit comprises main circuit, power circuit, controller holding circuit, multiple communication module, the outer temperature survey part of water, Data Flash, key-press input and liquid crystal display circuit, perpetual calendar timing module, software and hardware reset, iic bus module, anti-clutter circuit and expanded circuit; Wherein, power circuit comprises power-supplying circuit and voltage conversion circuit, completes the needed voltage of control circuit and supplies with; Controller holding circuit comprises relay protection circuit; Multiple communication module comprise usb communication, serial communication, network interface communication and with the communicating by letter of sensing circuit, infrared module; The outer temperature survey part of water is to measure the temperature of current air; Data Flash deposits the data of operation at any time; Key-press input and liquid crystal display circuit are the operation interfaces of artificial input of control commands, and liquid crystal display circuit shows surveyed water temperature and oxygen concentration information; Perpetual calendar timing module is to take the time; Software and hardware resets provides system under different situations can recover in time initialization; Iic bus module has timesharing, obtains reasonably arbitration simultaneously and distribute while making so multiple equipment apply for bus; The reliability of the main charge control circuit of anti-clutter circuit, protection control circuit can be worked normally.
2. according to claim 1
onekind of integral type dissolved oxygen analytic instrument, is characterized in that, described main circuit adopts the M3062LFGPGP in auspicious Sa M16C/62P series, completes and the communicating by letter and relevant order control of sensing circuit, other peripheral circuit.
3. one kind is utilized described in claim 1
oneplant the method that integral type dissolved oxygen analytic instrument is measured, it is characterized in that, described method is as follows:
(1) blue led produces blue light under the control of sensing circuit, and exciting of the plated film that process contains extraordinary fluorescent material, inspires ruddiness; Simultaneously red LED is sent ruddiness, and the reflection through the plated film that contains extraordinary fluorescent material with intensity, as with reference to ruddiness; In the water that contains variable concentrations oxygen, the red light intensity difference that the fluorescent material containing in the plated film that contains extraordinary fluorescent material excites, then with reference to simultaneously refraction and the filtration of scioptics of ruddiness, enter photoelectrical coupler, convert electric signal to and be sent to the sensing circuit of integral type dissolved oxygen analytic instrument;
(2) clock generator is to produce the clock of characteristic frequency for subsequent conditioning circuit; When memory module allows circuit operation, related data is stored at any time; Iic bus module has timesharing, obtains reasonably arbitration simultaneously and distribute while making multiple equipment apply for bus; The result of moving in display circuit display circuit; Warning circuit is specific moment prompting user; Power circuit is mainly responsible for sensing circuit lasting power supply supply is provided; Reset circuit makes sensing circuit initialization; The correction of signal is that the signal obtaining from probe circuit is carried out to pre-service and then be input to conversion chip processing; The control of signal is the emphasis of sensing circuit with conversion, the electric signal that thermal signal and light signal obtain after probe Collect conversion, then be input to control circuit through sensing circuit data after treatment, thus obtain oxygen concentration and the temperature of water body;
(3) power circuit comprises power-supplying circuit and voltage conversion circuit, completes the needed voltage of control circuit and supplies with; Controller holding circuit comprises relay protection circuit; Multiple communication module comprise usb communication, serial communication, network interface communication and with the communicating by letter of sensing circuit, infrared module; The outer temperature survey part of water is to measure the temperature of current air; Data Flash deposits the data of operation at any time; Key-press input and liquid crystal display circuit are the operation interfaces of artificial input of control commands, show the water temperature of surveying and oxygen concentration information; Perpetual calendar timing module is to take the time; Software and hardware resets provides system under different situations can recover in time initialization; Iic bus module has timesharing, obtains reasonably arbitration simultaneously and distribute while making so multiple equipment apply for bus; The reliability of the main charge control circuit of anti-clutter circuit, protection control circuit can be worked normally.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103398944A (en) * | 2013-08-14 | 2013-11-20 | 中山欧麦克仪器设备有限公司 | Remote control dissolved oxygen detector |
| CN104101585A (en) * | 2014-07-16 | 2014-10-15 | 东南大学 | Device and method for measuring phase difference of sinusoidal signals of on-line oxygen dissolving meter |
| CN105136766B (en) * | 2015-10-16 | 2017-09-26 | 山东省科学院海洋仪器仪表研究所 | A kind of dissolved oxygen sensing method and purposes based on Fluorescence Quenching Principle |
| CN110031437A (en) * | 2019-04-17 | 2019-07-19 | 青岛同华电力设备有限公司 | A kind of trace level high-accuracy portable dissolved oxygen measuring device based on fluorescence method |
| CN113176320B (en) * | 2021-03-23 | 2022-06-28 | 中国科学院计算技术研究所 | Flow velocity compensation method and system of membraneless dissolved oxygen sensor |
| CN114486828A (en) * | 2022-01-19 | 2022-05-13 | 安徽清大云博环保科技有限公司 | Dissolved oxygen analyzer capable of rapidly measuring |
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Address after: 210096, No. four archway, Xuanwu District, Jiangsu, Nanjing 2 Patentee after: SOUTHEAST University Patentee after: Nanjing jiesier environmental protection intelligent technology Co., Ltd Address before: 210096, No. four archway, Xuanwu District, Jiangsu, Nanjing 2 Patentee before: SOUTHEAST University Patentee before: Nanjing jiesier equipment Engineering Co., Ltd |