CN203930088U - A kind of ocean electrical survey (-ing) signal acquisition circuit - Google Patents
A kind of ocean electrical survey (-ing) signal acquisition circuit Download PDFInfo
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- CN203930088U CN203930088U CN201420342031.0U CN201420342031U CN203930088U CN 203930088 U CN203930088 U CN 203930088U CN 201420342031 U CN201420342031 U CN 201420342031U CN 203930088 U CN203930088 U CN 203930088U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The utility model discloses a kind of ocean electrical survey (-ing) signal acquisition circuit, comprise signal condition and analog to digital conversion circuit, Single-chip Controlling core, data storage circuitry, communicating circuit and electric power management circuit, wherein: Single-chip Controlling core is selected power supply source by controlling electric power management circuit; Single-chip Controlling core is controlled the signal of analog to digital conversion circuit collection after the conditionings such as amplification, filtering, and the numerical information obtaining is deposited large capacity SD card on the one hand, passes to water surface PC on the other hand by communicating circuit.The utility model adopts micro volume, be arranged on electrode place, in bee-line, the simulating signal of collection is converted to digital signal, has at utmost avoided simulating signal in transmitting procedure, to be sent interference and the intertrack crosstalk of cable high-power signal, improve measuring accuracy; Adopt RS-485 network transmission of digital signals in cable, reduced cable core number, alleviated cable weight, be convenient to transportation and drag operation.
Description
Technical field
The utility model relates to a kind of signal acquisition circuit, especially relates to a kind of with the signal acquisition circuit in Yu Haiyang electrical survey (-ing).
Background technology
In various seafari methods, ocean resistivity prospecting is according to the electromagnetic property difference existing between different material in marine bottom sediment and even the earth's crust, by observing electric field natural or artificial excitation, electromagnetic field distribution characteristics, study submarine geology structure, mineral resources distribution, solve a class geophysical exploration method of the geological problems such as engineering, environment, disaster.Under the Special Geological Condition that seismic prospecting is at sea difficult to play a role, ocean electrical method can provide the important information of seabed infrastructure.In recent years, the research of ocean electrical method and application obtained flourish, became a research direction very powerful and exceedingly arrogant in seafari method.
At present at home in ocean towing type electrical survey (-ing), Oceanographic Inst. No.1 of State Bureau of Oceanography cooperates with China Geological Univ. Wuhan, develop a set of marine double-frequency and swashed electrical resistivity survey examining system, through the experiment of ocean repeatedly, confirmed that it has obtained important breakthrough and accumulated a large amount of very valuable experiences in this field.The receiver of this marine double-frequency induced polarization instrument, when gathering Dual-frequency Ip Method signal, adopts centralized data acquisition modes.A plurality of receiving electrodes are connected on a polycore cable, and the data collecting card that multiple signals are sent in receiver by the transmission line analog signal in cable carries out analog to digital conversion.Which is similar to the working method of centralized multiple tracks seismic acquisition configuration, mainly have the following disadvantages: first, because the simulating signal of a plurality of passages is all transmitted in receiving cable, and simulating signal is easily sent interference and the intertrack crosstalk of cable high-power signal, affect the measuring precision and due to the limited further data acquisition channel number that limited of signal attenuation communication distance.And simulating signal needs independent circuit transmission, multi-channel data acquisition can increase the core number of cable, can increase the diameter of cable, cause cable to become heavy, in towing work and transportation, will be very inconvenient, and ocean operation environment very severe, cable is easily damaged, not easy-maintaining and replacing.Secondly, along with port number increases, cable size increases, and can increase sealing difficulty and the cost of cable.
Summary of the invention
For the problems referred to above, it is small that the purpose of this utility model is to provide a kind of volume, is easy to the ocean electrical survey (-ing) signal acquisition circuit of sealing, the simulating signal collecting can be converted into digital signal transmits in cable, improve measuring accuracy, reduce cable core number, alleviate cable weight.
For achieving the above object, the technical scheme that the utility model adopts is: at a signal acquisition circuit of each receiving electrode place sealing, the simulating signal collecting is converted to digital signal to be sent on cable, the Acquisition Circuit at a plurality of receiving electrodes place forms collection network by RS-485 communication and transfers signals on PC, reduces cable core number.
Described each signal acquisition circuit comprises signal condition and analog to digital conversion circuit, the single-chip microcomputer as control core, data storage circuitry, communicating circuit, real-time monitoring circuit and electric power management circuit.Wherein, described single-chip microcomputer is the core of signals collecting, and by independent powered battery, the instruction that its reception PC sends is controlled Power Management Unit and selected other modular circuits by externally fed or powered battery, and returns to supply voltage value; Under Single-chip Controlling, analog to digital conversion circuit gathers electric signal, stores the data that obtain into large capacity SD card, and passes to water surface PC by RS-485 communicating circuit.
Described electric power management circuit power supply mode is selected by externally fed or by the powered battery carrying.When adopting externally fed, by external power cord, to circuit, provide power supply.In order to improve delivery of electrical energy efficiency, reduce ability loss, will adopt 24V or the transmission of electricity of 36V voltage, by step-down chip, changed into low-voltage and used.In order to reduce the power attenuation of reduction voltage circuit, voltage conversion circuit is selected high efficiency DC/DC chip, meanwhile, in order to reduce the power supply noise of introducing because of DC/DC, connects one-level low pressure difference linear voltage regulator after DC/DC again.
Described single-chip microcomputer adopts low-power consumption MSP430F1611 single-chip microcomputer, for controlling the storage of serial communication module, calendar clock module, SD card memory module, selection power supply source, analog to digital conversion and data.
Described single-chip microcomputer includes two serial ports: one and the communication of water surface PC, carry out the function that comprises that state detecting information, startup and power cut-off, parameter arrange; Another is by serial ports time-sharing multiplex, respectively with real-time clock and memory module communication.
Described signal condition and analog to digital conversion circuit adopt 24 analog to digital converter translation circuits of 3 input channels to carry out analog to digital conversion to the signal of 3 passages, the electric signal of exporting from the electrode of adjacent three passages is respectively after front end difference input bias voltage, send into preposition programmable amplifier and amplify, then after the Butterworth LPF of a second order, send in 24 analog to digital converters.Analog to digital converter, under the control of single-chip microcomputer, is converted into digital signal the analog electrical signal gathering, and by spi bus, the data that obtain is stored in large capacity SD card, and is transferred to PC by RS-485 bus network.
Described communicating circuit comprises 232 serial communications, 485 communications of isolating with photoelectricity, wherein: single-chip microcomputer and water surface PC adopt 485 communications of light isolation; Single-chip microcomputer and AD conversion unit adopt 232 serial communications.Content of communciation comprises single-chip microcomputer and PC communication, comprises the transmission of data and instruction, the time-sharing multiplex of serial ports, the identification of order, the reception of data and verification, communication failure identification and processing; Unibus reads and sets the reference time of calendar clock and alarm time is set, and the alarm decision and the upper PC system of sending out of packing that comprise Monitoring Data.
Described real-time monitoring circuit obtains voltage, temperature information by Single-chip Controlling core by serial ports time-sharing multiplex mode, is uploaded in real time water surface PC.
Because signal acquisition circuit can be used for a long time powered battery in work in seabed, therefore, in design node and collection network, considered its low power capabilities.Adopt design with the following method and realize, select the low device of oneself power consumption.As the utility model has been selected the low-power scm of MSP430 series, when it is in the dormancy of LPM3 pattern time, current sinking only has 0.1 μ A; Use LVPS, it is system power supply that node is used 3V, reduces the power consumption that voltage can obviously reduce each chip and circuit; Close unwanted resource as far as possible, such as the resources such as timer of single-chip microcomputer, after being used to complete, close at any time; Communication device acquiescence is closed, and when sending and receiving, enables, and each temporary transient obsolete storer, clock chip etc., cancel chip selection signal; The power supply of the outer device of monolithic Bigpian can turn-off control by chip microcontroller as far as possible, as the power supply of signal conditioning circuit and analog to digital conversion circuit is controlled by a cmos device, single-chip microcomputer can integral body turn-off the power supply of this module, maximized saving power consumption when it is idle; Make full use of park mode and the interrupt function of single-chip microcomputer, be allowed to condition in the overwhelming majority time in dormant state.
Signal acquisition circuit need to be sealed in the waterproof compartment of cable splice, in order to seal, light and crushing resistance, makes device can adapt to darker waters work, needs small size.Adopted following measure to realize the volume microminiaturization of node: components and parts and connector adopt minimum encapsulation as far as possible.In design of node, most chip is all flat paster encapsulation, and resistance capacitance is used 0402 package dimension, has saved to greatest extent space; Simple circuit, circuit board is depicted as 4 layers of pcb board, has increased the area of cabling, has compressed the overall volume of node; Because system is used powered battery, reduced after the power consumption of system, under same service time, can make the capacity of battery and volume reduce, also can realize reducing of overall volume.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model.
Fig. 2 is the block diagram of the utility model signal condition and analog to digital conversion circuit.
Fig. 3 is the process flow diagram of the utility model signals collecting.
Embodiment
Below in conjunction with accompanying drawing and by specific embodiment, further describe the utility model.Should be understood that these embodiment are for illustrating the utility model rather than limiting its protection domain.
As shown in Figure 1, the utility model comprises signal condition and analog to digital conversion circuit, single-chip microcomputer, data storage circuitry, RS-485 communicating circuit and electric power management circuit.Wherein: single-chip microcomputer is the core of signal collecting and controlling, by independent powered battery, the instruction that its reception PC sends is controlled Power Management Unit and is selected other modular circuits by externally fed or powered battery, and returns to supply voltage value; Under Single-chip Controlling, analog to digital conversion circuit gathers electric signal, and the data that obtain store large capacity SD card into, and pass to water surface PC by RS-485 communicating circuit.Wherein,
1. electric power management circuit: comprise that power supply source selects and data-switching part.
System can be selected by externally fed or by the powered battery carrying.Voltage transitions partly adopts the voltage transformation module of a plurality of different model isolated form DC/DC, and it is converted to independently power supply to externally fed or by the powered battery voltage carrying, each module of supply circuit.
2. signal condition and analog to digital conversion circuit:
Adopt 24 analog to digital converter translation circuits of 3 input channels to carry out analog to digital conversion to the signal of 3 passages, the electric signal of exporting from the electrode of adjacent three passages is respectively after front end difference input bias voltage, sending into preposition programmable amplifier amplifies, then after the Butterworth LPF of a second order, send in 24 analog to digital converters, as shown in Figure 2.Analog to digital converter, under the control of single-chip microcomputer, is converted into digital signal analog electrical signal, by spi bus, the data that obtain is stored in large capacity SD card, and is transferred to PC by RS-485 bus network.
3. single-chip microcomputer main control unit:
Adopting low-power scm MSP430F1611 is control core, mainly comprises with lower module: serial port module, calendar clock module, SD card memory module, watchdog module.
Serial port module: this series monolithic has two serial ports, one and the communication of water surface PC.Another is by serial ports time-sharing multiplex, respectively with analog to digital conversion circuit, memory circuit communication.
Calendar clock module (chip model DS1306) mainly contains three effects: be the analysis raising correct time information of measurement data; For starting or stoping to measure, timing provides external interrupt; Can be used as external definition resets.
Single-chip microcomputer is the control core of signal acquisition circuit, and major function is to carry out corresponding operation by receiving the communication instruction of water surface PC: startup self-detection, startup and power cut-off and parameter setting.When communicating interrupt with PC, monolithic function is taken over, and completes normal data collection.When the moment presetting arrives, (calendar clock produces and interrupts), will trigger single-chip microcomputer and start surveying work; Can automatically quit work when presetting the finish time.
The FB(flow block) of Single-chip Controlling core (hereinafter to be referred as main control unit) software is shown in Fig. 3.Main flow process is: after powering on, program enters initialization subfunction, mainly comprises that system clock initialization, serial ports initialization, Micro SD card detect and initialization.After completing, initialization reads the operational parameter value existing in power down preventing storer, running status during judgement power down last time.If be improper reset in working order time last time, system directly enters duty, otherwise enter dormancy, waits for that serial ports interrupts occurring.Serial ports is had no progeny in producing, and program can be made following three kinds of tasks: parameter setting, file read, enter work.The program exit of three kinds of tasks is all to turn back to continue to wait for that serial ports interrupts, until next task produces.
4.RS-485 communicating circuit:
Communication modes comprises 232 serial communications, 485 communications of isolating with photoelectricity.Wherein, single-chip microcomputer and the communication of water surface PC make to use up 485 communications of isolation; 232 communications are used in Single-chip Controlling analog to digital conversion and data storage.Communication Main Function is the instruction and data transmission that realizes water surface PC system and single-chip microcomputer, the modification of parameter, the reading etc. of monitoring state.
The utility model is considered the singularity of drag operation, has done following design:
Signal acquisition circuit need to be sealed in the waterproof compartment of cable splice, in order to seal, light and crushing resistance, makes device can adapt to darker waters work, needs small size.Adopted following measure to realize the volume microminiaturization of node: components and parts and connector adopt minimum encapsulation as far as possible.In design of node, most chip is all flat paster encapsulation, and resistance capacitance is used 0402 package dimension, has saved to greatest extent space; Simple circuit, circuit board is depicted as 4 layers of pcb board, has increased the area of cabling, has compressed the overall volume of node; Because system is used powered battery, reduced after the power consumption of system, under same service time, can make the capacity of battery and volume reduce, also can realize reducing of overall volume.
Because signal acquisition circuit can be used for a long time powered battery in work in seabed, therefore, in design node and collection network, considered its low power capabilities.Adopt design with the following method and realize, select the low device of oneself power consumption.As native system has been selected the single-chip microcomputer of this low-power consumption series of MSP430, when it is in the dormancy of LPM3 pattern time, current sinking only has 0.1 μ A.Use LVPS, it is system power supply that node is used 3V, reduces the power consumption that voltage can obviously reduce each chip and circuit; Close unwanted resource as far as possible.Such as the resources such as timer of single-chip microcomputer, after being used to complete, close at any time; Communication device acquiescence is closed in transmission, receives enabled state, and each temporary transient obsolete storer, clock chip etc. are cancelled chip selection signal; The power supply of the outer device of monolithic Bigpian can turn-off control by chip microcontroller as far as possible.As the power supply of signal conditioning circuit and analog to digital conversion circuit is controlled by a cmos device, single-chip microcomputer can integral body turn-off the power supply of this module, the maximized power consumption of having saved when it is idle; Make full use of park mode and the interrupt function of single-chip microcomputer, be allowed to condition in the overwhelming majority time in dormant state.
The course of work of the present utility model is as follows:
Single-chip microcomputer is the core of whole signal acquisition circuit, the tasks such as command execution startup self-detection, startup and the power cut-off of reception water surface PC, parameter setting, data readback.Single-chip microcomputer and water surface PC communication accidental interruption or while having a mind to set, Subsea Control Systems is failure judgement in time, the program that enters is from molar formula, and single-chip microcomputer, there is no to take under the instruction of the water surface PC work of whole signals collecting, completes default task.
First system selects power supply source.In self check operation, single-chip microcomputer is opened each equipment successively, and communication with it, if communication is normal, and indices is without extremely, thinks that self check passes through.If Communications failure, or a certain information is abnormal, and single-chip microcomputer will send fault-signal to water surface PC.
During parameter arranges, single-chip microcomputer is first opened analog to digital conversion circuit, and the parameter then water surface PC being issued (comprise start by set date and finish Measuring Time, data upload interval time, time calibration etc.), sends to single-chip microcomputer.Monolithic carries out power down preventing storage after receiving data, and on send instructions and represent that parameter arranges successfully.Single-chip microcomputer cuts out analog to digital conversion circuit after receiving instruction, and replys water surface PC parameter and arrange successfully.
In work, single-chip microcomputer waits for that PC issues the order that starts measurement.If do not issue this order, when default startup measurement arrives constantly, single-chip microcomputer will be ordered analog to digital conversion circuit unlatching work.Analog to digital conversion circuit converts the electrical signal to digital signal, and one side stores data in SD by spi bus and is stuck in, and will in data, send to water surface PC on the one hand by RS-485 bus.When water surface PC issues, finish measuring command or default end and measure while constantly arriving, single-chip microcomputer order analog to digital conversion circuit is deactivated, and powered-down.
Above-mentioned example only, for explanation technical conceive of the present utility model and feature, can not limit protection domain of the present utility model with this.All equivalent transformations of doing according to the utility model Spirit Essence or modification, all should be encompassed in protection domain of the present utility model.
Claims (8)
1. an ocean electrical survey (-ing) signal acquisition circuit, it is characterized in that this circuit comprises signal condition and analog to digital conversion circuit, Single-chip Controlling core, data storage circuitry, communicating circuit and electric power management circuit, wherein: Single-chip Controlling core is selected power supply source by controlling electric power management circuit; Single-chip Controlling core is controlled the signal of analog to digital conversion circuit collection after the conditionings such as amplification, filtering, and the numerical information obtaining is deposited large capacity SD card on the one hand, passes to water surface PC on the other hand by communicating circuit.
2. electrical survey (-ing) signal acquisition circuit in ocean according to claim 1, it is characterized in that described signal condition and analog to digital conversion circuit adopt 24 analog to digital converter translation circuits of 3 input channels to carry out analog to digital conversion to the signal of 3 passages, the electric signal of exporting from the electrode of adjacent 3 passages is respectively after front end difference input bias voltage, send into preposition programmable amplifier and amplify, then after the Butterworth LPF of a second order, send in 24 analog to digital converters.
3. electrical survey (-ing) signal acquisition circuit in ocean according to claim 1, it is characterized in that it is control core that described Single-chip Controlling core adopts low-power consumption MSP430F1611 single-chip microcomputer, major control serial communication module, calendar clock module, SD card memory module, multi-way switch drive and indicating module work.
4. electrical survey (-ing) signal acquisition circuit in ocean according to claim 3, is characterized in that described Single-chip Controlling core has two serial ports, and one and the communication of water surface PC are carried out and comprised state detecting information, startup and power cut-off, parameter setting; Another is by serial ports time-sharing multiplex, respectively with data acquisition circuit module and data memory module communication.
5. a kind of ocean electrical survey (-ing) signal acquisition circuit according to claim 4, is characterized in that monolithic function is taken over, and when the moment presetting arrives, will trigger single-chip microcomputer startup surveying work when communicating interrupt with water surface PC; Can automatically stop surveying work when presetting the finish time.
6. electrical survey (-ing) signal acquisition circuit in ocean according to claim 1, it is characterized in that described electric power management circuit comprises power supply source selection part and voltage transitions part, wherein: power supply source selects part to use single-chip microcomputer select externally fed or carry powered battery; The cell voltage that voltage transitions part provides outside or carry is converted to independently supply voltage for each module of circuit.
7. electrical survey (-ing) signal acquisition circuit in ocean according to claim 1, is characterized in that described communication unit comprises 232 serial communications, 485 communications of isolating with photoelectricity, wherein: 232 serial ports are used in single-chip microcomputer and the communication of water surface PC; 232 communications are used in single-chip microcomputer and data acquisition unit communication.
8. electrical survey (-ing) signal acquisition circuit in ocean according to claim 1, it is characterized in that described communicating circuit comprises 232 serial communications, 485 communications of isolating with photoelectricity, Content of communciation mainly comprises Single-chip Controlling core and PC communication, comprise the transmission of data and instruction, the time-sharing multiplex of serial ports, the identification of order, the reception of data and verification, communication failure identification and processing; Unibus reads and sets the reference time of calendar clock and alarm time is set, and the alarm decision and the upper PC system of sending out of packing that comprise Monitoring Data.
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| CN201420342031.0U CN203930088U (en) | 2014-06-25 | 2014-06-25 | A kind of ocean electrical survey (-ing) signal acquisition circuit |
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| CN201420342031.0U CN203930088U (en) | 2014-06-25 | 2014-06-25 | A kind of ocean electrical survey (-ing) signal acquisition circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104199112A (en) * | 2014-06-25 | 2014-12-10 | 国家海洋局第一海洋研究所 | Oceanic electrical prospecting signal collection circuit |
| CN111323828A (en) * | 2020-04-02 | 2020-06-23 | 中国海洋大学 | Program-controlled gain type ocean electric field signal acquisition method, system, device and application |
-
2014
- 2014-06-25 CN CN201420342031.0U patent/CN203930088U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104199112A (en) * | 2014-06-25 | 2014-12-10 | 国家海洋局第一海洋研究所 | Oceanic electrical prospecting signal collection circuit |
| CN111323828A (en) * | 2020-04-02 | 2020-06-23 | 中国海洋大学 | Program-controlled gain type ocean electric field signal acquisition method, system, device and application |
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