CN104391337A - Monitoring instrument for receiving earthly natural pulse electromagnetic field signals - Google Patents
Monitoring instrument for receiving earthly natural pulse electromagnetic field signals Download PDFInfo
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- CN104391337A CN104391337A CN201410805153.3A CN201410805153A CN104391337A CN 104391337 A CN104391337 A CN 104391337A CN 201410805153 A CN201410805153 A CN 201410805153A CN 104391337 A CN104391337 A CN 104391337A
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Abstract
The invention provides a monitoring instrument for receiving earthly natural pulse electromagnetic field signals. The monitoring instrument comprises a sensor for acquiring the natural pulse electromagnetic field signals on the surface of the earth, a control unit and a power supply unit for supplying power, wherein the control unit adopts an MSP430F169IPM chip; the sensor adopts an earthly natural pulse electromagnetic field very low frequency receiving sensor; the output end of the sensor is connected with a program-controlled amplifying unit for amplifying the signals through a front-end conditioning unit for secondarily conditioning the signals acquired by the sensor; the program-controlled amplifying unit is bidirectionally connected with the control unit; the control unit is connected with a 3G communication module and a PC. The monitoring instrument acquires the natural pulse electromagnetic field signals on the surface of the earth through the sensor, preprocesses the signals, and performs program-controlled amplification under the setting of the control unit; the whole monitoring instrument is simple in circuit, small in size, stable and high in efficiency, and is powdered only by a direct current power supply and thus is convenient during field operation.
Description
Technical field
The present invention relates to a kind of monitoring instrument for receiving earth natural pulses electromagnetic field signal, belonging to Geodetection and Information Technology field, can be applicable to earthquake precursors research and to study and come down electromagnetism early warning field with earthquake prediction field, oil-gas exploration.
Background technology
Earth natural pulses electromagnetic field (Earth's natural pulse electromagnetic field, referred to as ENPEMF) refers to the electromagnetic field signal produced by natural field source that can receive on earth's surface.In different poses and with different expressions and the crisscross distribution of the various rock of earth interior of earth surface, the difference of the existence of various tomography, crack, fold, earth interior pressure, temperature, and the electric conductivity of various underground medium, specific inductive capacity, magnetoconductivity and electrochemical properties vary, make the generation of ground electromagnetic field, development and distribution all very complicated.The field source of signal both can reflect various electromagnetics phenomenons aerial on earth's surface, more can reflect from intracrustal " underground thunderstorm ".
The frequency distribution of the natural field source of the earth is very wide, and lower than the ultralow frequency range of 1Hz, the extremely low frequency section of 1Hz to 1KHz and the very low frequency (VLF) section (VLF) of 1KHz to 100KHz all have distribution.Although the frequency spectrum of earth Natural electromagnetic field is quite extensive, its energy distribution is mainly within the scope of 1Hz extremely number kHz.The pulse that ENPEMF produces not only derives from air, and more derives from the process between earth crust structure-electric energy conversion.Earthquake seismogenic zone tectonic faults is movable, similar rock sample produces shear fracture and Frictional Slipping, around faulted joint, place the antenna of each quefrency, adopt automatically spread for continuous profiling fast, a large amount of electromagnetic signals from hundreds of hertz ~ tens KHz can be recorded.So one of field source of the natural electromagnetic pulse electromagnetic field that is the earth of the faulting before earthquake.
The monitoring instrument of existing natural pulses electromagnetic field signal is in order to ensure data precision, and circuit is extremely complicated, cause bulky, process complexity, signal transacting fault-tolerant rate variance, and power requirement is high, inconvenient field work.
Summary of the invention
In order to solve the deficiencies in the prior art, the invention provides a kind of monitoring instrument for receiving earth natural pulses electromagnetic field signal, sensor is utilized to gather earth's surface Natural electromagnetic field pulse signal, then by integrated chip and peripheral circuit, signal is delivered to front end conditioning unit to amplify, filtering, linear compensation, isolation, protection, AD conversion etc. carry out pre-service, then under the setting of control module, programming amplifying is carried out, to meet the requirement of data analysis, whole monitoring instrument circuit is simple, volume is little, signal transacting is stablized, efficiency is high, and only need powered by direct current, facilitate field work.
The technical scheme that the present invention adopts for its technical matters of solution is: provide a kind of monitoring instrument for receiving earth natural pulses electromagnetic field signal, comprise the sensor for gathering earth surface natural pulses electromagnetic field signal, control module and the power supply unit for powering, the output terminal of described sensor is connected to the programming amplifying unit for carrying out signal amplification by the front end conditioning unit for carrying out secondary conditioning to the signal of sensor collection, described programming amplifying unit and control module are bi-directionally connected, described control module is connected with 3G communication module and PC, described sensor is earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor, and comprise coil, magnetic core and external shield sleeve pipe, magnetic core is cylindric, and its diameter is 8 ~ 10mm, and length is 160 ~ 180mm, and magnetic core adopts MnZn ferrite material to make, described coil is for receiving earth's surface natural pulses electromagnetic field and converting electric signal to, and coil is wrapped on magnetic core in the same direction evenly, closely, is wound with 1900 ~ 2100 circles, described external shield sleeve pipe is the copper pipe of cylindric ground connection, external shroud pipe box is on magnetic core and coil, its internal diameter is 9 ~ 11mm, its length 8 ~ 12mm larger than core length, the two ends of coil are stretched out by the same one end open on external shield sleeve pipe, gap place between magnetic core and external shield sleeve pipe is filled with solid gum, and magnetic core and coil are fixed in external shield sleeve pipe by described solid gum, the bottom of described external shield sleeve pipe has the length opening identical with core length vertically.
Described coil is the enameled wire of diameter 0.1mm.
The secondary modulate circuit that described front end conditioning unit adopts the first passage of instrument amplifier INA128 chip and dual operational amplifier OPA2227 chip to form, wherein first order conditioning amplifying circuit adopts instrument amplifier INA128 chip, its 1 pin is connected with 8 pin by the resistance OP_R1 of 510 Ω, and its 6 pin passes through the electric capacity OP_C9 of 0.1uF and the resistance OP_R2 ground connection of 10K Ω of series connection; Second level modulate circuit adopts the first passage of dual operational amplifier OPA2227 chip, and its 1 pin is connected with 2 pin by the resistance OP_R3 of 910 Ω, and its 2 pin is by the resistance OP_R4 ground connection of 100 Ω, and its 3 pin is by the resistance OP_R3 ground connection of 10K Ω; 2 pin of instrument amplifier INA128 chip are connected with the output terminal of sensor with 3 pin; Described programming amplifying unit adopts second channel, analog switch sn741vc2g53 chip, digital to analog converter DAC7811 chip, the voltage operational amplifier OPA277 of dual operational amplifier OPA2227 chip, the wherein pin 9 of 1 pin linking number weighted-voltage D/A converter DAC7811 chip of dual operational amplifier OPA2227 chip first passage; Output terminal 7 pin of dual operational amplifier OPA2227 chip second channel is connected with one end of one end of 100 Ω resistance OP_R7 and 10K Ω resistance OP_R6, the other end of resistance OP_R7 and resistance OP_R6 distinguishes 6 pin and 7 pin of connecting analog switch sn741vc2g53 chip again, as the optional control end of enlargement factor, output terminal 7 pin of dual operational amplifier OPA2227 chip second channel is the output terminal of programming amplifying unit simultaneously; 1 pin of digital to analog converter DAC7811 chip, 2 pin and 10 pin are connected with 2 pin of voltage operational amplifier OPA277,3 pin and 6 pin respectively; 6 pin of voltage operational amplifier OPA277 are connected to 6 pin of dual operational amplifier OPA2227 chip second channel by 100 Ω resistance OP_R5.
Described control module adopts MSP430F169IPM chip, and it is connected with programming amplifying unit by modulus conversion chip ADS8361, and wherein 6 pin of modulus conversion chip ADS8361 are connected to 30 pin of MSP430F169IPM chip; Described control module connects 3G communication module by the optional conventional control port of MSP430F169IPM chip.
Described control module is connected with PC by serial transceiver SP202EEN-LTR chip, and wherein, 32 pin of MSP430F169IPM chip and 33 pin are connected with 10 pin of SP202EEN-LTR chip and 9 pin respectively, then are connected with PC.
The present invention is based on the beneficial effect that its technical scheme has to be:
(1) signal of sensor reception of the present invention is through front end conditioning unit and programming amplifying unit, can carry out amplifying, filtering, linear compensation, isolation, protection, the pre-service such as AD conversion, then under the setting of control module, programming amplifying is carried out, to meet the requirement of data analysis, stability is high, simple to operate;
(2) control module of the present invention adopts MSP430F169IPM chip, is provided with 3G communication module, can realizes by network uploading data; Control module is connected with PC simultaneously, the data of collection can be transferred to PC process;
(3) the monitoring instrument circuit for receiving earth natural pulses electromagnetic field signal of the present invention is simple, volume is little, signal transacting is stable, efficiency is high, and only needs powered by direct current, is applicable to long-term field operation;
(4) sensor of the present invention adopts earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor, the natural magnetic field that earth surface converts can be changed into the electric signal of linear change, and be exported by voltage signal; Set external shield sleeve pipe solves a difficult problem for artificial field interference, effectively can receive again very low frequency (VLF) frequency range natural pulses Geomagnetic signal simultaneously; This sensor is utilized to gather very low frequency (VLF) frequency range natural pulses Geomagnetic signal; pre-service such as recycling front end conditioning unit and programming amplifying unit amplifies signal, filtering, linear compensation, isolation, protection, AD conversion etc.; stability is high, degree of accuracy is high; the needs of scientific analysis research can be met, have positive meaning to the omen research of geophysics's exploration, geology analysis and disaster.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the monitoring instrument for receiving earth natural pulses electromagnetic field signal.
Fig. 2 is front end conditioning unit and programming amplifying element circuit connection diagram.
Fig. 3 is control module circuit connection diagram.
Fig. 4 is the circuit connection diagram that control module is connected with PC.
Fig. 5 is analog to digital conversion circuit connection diagram.
Fig. 6 is the structural representation of magnetic core and coil.
Fig. 7 is the one-piece construction schematic diagram of earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor.
Fig. 8 is the sectional view of external shield sleeve pipe.
In figure: 1-magnetic core, 2-coil, 3-external shield sleeve pipe.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
With reference to Fig. 1, the technical scheme that the present invention adopts for its technical matters of solution is: provide a kind of monitoring instrument for receiving earth natural pulses electromagnetic field signal, comprise the sensor for gathering earth surface natural pulses electromagnetic field signal, control module and the power supply unit for powering, the output terminal of described sensor is connected to the programming amplifying unit for carrying out signal amplification by the front end conditioning unit for carrying out secondary conditioning to the signal of sensor collection, described programming amplifying unit and control module are bi-directionally connected, described control module is connected with 3G communication module and PC.
Described sensor adopts earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor, its one-piece construction as shown in Figure 7, be made up of coil 2, magnetic core 1 and external shield sleeve pipe 3, described magnetic core 1 is in cylindric, its diameter is 8 ~ 10mm, length is 160 ~ 180mm, and magnetic core adopts MnZn ferrite material to make; Described coil 2 is for receiving earth's surface natural pulses electromagnetic field and converting electric signal to, and coil is wrapped on magnetic core in the same direction evenly, closely, is wound with 1900 ~ 2100 circles, and as shown in Figure 6, described coil 2 is the enameled wire of diameter 0.1mm.Described external shield sleeve pipe 3 is the copper pipe of cylindric ground connection, external shield sleeve pipe 3 is enclosed within magnetic core and coil, its internal diameter is 9 ~ 11mm, its length 8 ~ 12mm larger than core length, the two ends of coil are stretched out by the same one end open on external shield sleeve pipe, gap place between magnetic core and external shield sleeve pipe is filled with solid gum, and magnetic core and coil are fixed in external shield sleeve pipe by described solid gum; The bottom of described external shield sleeve pipe has the length opening identical with core length vertically, as shown in Figure 8.Simultaneously in order to reduce the impact of ambient noise signal, antenna outer cover a kerf is the copper pipe of 3mm, copper pipe ground connection, as shown in Figure 8.
With reference to Fig. 2, the secondary modulate circuit that described front end conditioning unit adopts the first passage of instrument amplifier INA128 chip and dual operational amplifier OPA2227 chip to form, wherein first order conditioning amplifying circuit adopts instrument amplifier INA128 chip, its 1 pin is connected with 8 pin by the resistance OP_R1 of 510 Ω, its 6 pin passes through the electric capacity OP_C9 of 0.1uF and the resistance OP_R2 ground connection of 10K Ω of series connection, and namely Sce_3O termination Sce_3I holds; Second level modulate circuit adopts the first passage of dual operational amplifier OPA2227 chip, and its 1 pin is connected with 2 pin by the resistance OP_R3 of 910 Ω, and its 2 pin is by the resistance OP_R4 ground connection of 100 Ω, and its 3 pin is by the resistance OP_R3 ground connection of 10K Ω; 2 pin of instrument amplifier INA128 chip are connected with the output terminal of sensor with 3 pin.The fixed gain of first order modulate circuit and second level modulate circuit is 10 times.
Described programming amplifying unit adopts second channel, analog switch sn741vc2g53 chip, digital to analog converter DAC7811 chip, the voltage operational amplifier OPA277 of dual operational amplifier OPA2227 chip, the wherein pin 9 of 1 pin linking number weighted-voltage D/A converter DAC7811 chip of dual operational amplifier OPA2227 chip first passage; Output terminal 7 pin of dual operational amplifier OPA2227 chip second channel is connected with one end of one end of 100 Ω resistance OP_R7 and 10K Ω resistance OP_R6, the other end of resistance OP_R7 and resistance OP_R6 distinguishes 6 pin and 7 pin of connecting analog switch sn741vc2g53 chip again, as the optional control end of enlargement factor, output terminal 7 pin of dual operational amplifier OPA2227 chip second channel is the output terminal of programming amplifying unit simultaneously; 1 pin of digital to analog converter DAC7811 chip, 2 pin and 10 pin are connected with 2 pin of voltage operational amplifier OPA277,3 pin and 6 pin respectively; 6 pin of voltage operational amplifier OPA277 are connected to 6 pin of dual operational amplifier OPA2227 chip second channel by 100 Ω resistance OP_R5, namely Sce-4I end connects Sce-4O end.The gain of programming amplifying unit is optional-10 times to-1 times.
With reference to Fig. 3, Fig. 4 and Fig. 5, described control module adopts MSP430F169IPM chip, and it is connected with programming amplifying unit by modulus conversion chip ADS8361, and wherein 6 pin of modulus conversion chip ADS8361 are connected to 30 pin of MSP430F169IPM chip; Described control module connects 3G communication module by the optional conventional control port of MSP430F169IPM chip.Described control module is connected with PC by serial transceiver SP202EEN-LTR chip, and wherein, 32 pin of MSP430F169IPM chip and 33 pin are connected with 10 pin of SP202EEN-LTR chip and 9 pin respectively, then are connected with PC.Header3 in figure is connection plug, and 3 indicate 3 connecting lead wires.
The signal frequency of the collection of sensor is 5KHz ~ 25KHz, continuously the pulse number in record 24 hours each moment of every day, and frequency acquisition is second.
Claims (5)
1. for receiving the monitoring instrument of earth natural pulses electromagnetic field signal, comprise the sensor for gathering earth surface natural pulses electromagnetic field signal, control module and the power supply unit for powering, it is characterized in that: the output terminal of described sensor is connected to the programming amplifying unit for carrying out signal amplification by the front end conditioning unit for carrying out secondary conditioning to the signal of sensor collection, described programming amplifying unit and control module are bi-directionally connected, and described control module is connected with 3G communication module and PC; Described sensor is earth natural pulses electromagnetic field very low frequency (VLF) receiving sensor, and comprise coil, magnetic core and external shield sleeve pipe, magnetic core is cylindric, and its diameter is 8 ~ 10mm, and length is 160 ~ 180mm, and magnetic core adopts MnZn ferrite material to make; Described coil is for receiving earth's surface natural pulses electromagnetic field and converting electric signal to, and coil is wrapped on magnetic core in the same direction evenly, closely, is wound with 1900 ~ 2100 circles; Described external shield sleeve pipe is the copper pipe of cylindric ground connection, external shroud pipe box is on magnetic core and coil, its internal diameter is 9 ~ 11mm, its length 8 ~ 12mm larger than core length, the two ends of coil are stretched out by the same one end open on external shield sleeve pipe, gap place between magnetic core and external shield sleeve pipe is filled with solid gum, and magnetic core and coil are fixed in external shield sleeve pipe by described solid gum; The bottom of described external shield sleeve pipe has the length opening identical with core length vertically.
2. the monitoring instrument for receiving earth natural pulses electromagnetic field signal according to claim 1, is characterized in that: described coil is the enameled wire of diameter 0.1mm.
3. the monitoring instrument for receiving earth natural pulses electromagnetic field signal according to claim 1, it is characterized in that: the secondary modulate circuit that described front end conditioning unit adopts the first passage of instrument amplifier INA128 chip and dual operational amplifier OPA2227 chip to form, wherein first order conditioning amplifying circuit adopts instrument amplifier INA128 chip, its 1 pin is connected with 8 pin by the resistance OP_R1 of 510 Ω, and its 6 pin passes through the electric capacity OP_C9 of 0.1uF and the resistance OP_R2 ground connection of 10K Ω of series connection; Second level modulate circuit adopts the first passage of dual operational amplifier OPA2227 chip, and its 1 pin is connected with 2 pin by the resistance OP_R3 of 910 Ω, and its 2 pin is by the resistance OP_R4 ground connection of 100 Ω, and its 3 pin is by the resistance OP_R3 ground connection of 10K Ω; 2 pin of instrument amplifier INA128 chip are connected with the output terminal of sensor with 3 pin;
Described programming amplifying unit adopts second channel, analog switch sn741vc2g53 chip, digital to analog converter DAC7811 chip, the voltage operational amplifier OPA277 of dual operational amplifier OPA2227 chip, the wherein pin 9 of 1 pin linking number weighted-voltage D/A converter DAC7811 chip of dual operational amplifier OPA2227 chip first passage; Output terminal 7 pin of dual operational amplifier OPA2227 chip second channel is connected with one end of one end of 100 Ω resistance OP_R7 and 10K Ω resistance OP_R6, the other end of resistance OP_R7 and resistance OP_R6 distinguishes 6 pin and 7 pin of connecting analog switch sn741vc2g53 chip again, as the optional control end of enlargement factor, output terminal 7 pin of dual operational amplifier OPA2227 chip second channel is the output terminal of programming amplifying unit simultaneously; 1 pin of digital to analog converter DAC7811 chip, 2 pin and 10 pin are connected with 2 pin of voltage operational amplifier OPA277,3 pin and 6 pin respectively; 6 pin of voltage operational amplifier OPA277 are connected to 6 pin of dual operational amplifier OPA2227 chip second channel by 100 Ω resistance OP_R5.
4. the monitoring instrument for receiving earth natural pulses electromagnetic field signal according to claim 3, it is characterized in that: described control module adopts MSP430F169IPM chip, it is connected with programming amplifying unit by modulus conversion chip ADS8361, and wherein 6 pin of modulus conversion chip ADS8361 are connected to 30 pin of MSP430F169IPM chip; Described control module connects 3G communication module by the optional conventional control port of MSP430F169IPM chip.
5. the monitoring instrument for receiving earth natural pulses electromagnetic field signal according to claim 4, it is characterized in that: described control module is connected with PC by serial transceiver SP202EEN-LTR chip, wherein, 32 pin of MSP430F169IPM chip and 33 pin are connected with 10 pin of SP202EEN-LTR chip and 9 pin respectively, then are connected with PC.
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| CN201410805153.3A CN104391337B (en) | 2014-12-22 | 2014-12-22 | For receiving the monitoring instrument of earth natural pulses electromagnetic field signal |
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| CN201410805153.3A CN104391337B (en) | 2014-12-22 | 2014-12-22 | For receiving the monitoring instrument of earth natural pulses electromagnetic field signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104991276A (en) * | 2015-06-29 | 2015-10-21 | 中国地质大学（武汉） | Programmable gain amplification system for earth natural pulse electromagnetic field signal |
| CN107037486A (en) * | 2017-03-31 | 2017-08-11 | 中国地质大学（武汉） | The Time-frequency Spectrum Analysis method and system of earth natural pulses electromagnetic field data processing |
| CN112994636A (en) * | 2021-02-04 | 2021-06-18 | 珠海市丰润自动化科技有限公司 | Method for eliminating dead weight, storage medium and terminal |
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| CN112994636A (en) * | 2021-02-04 | 2021-06-18 | 珠海市丰润自动化科技有限公司 | Method for eliminating dead weight, storage medium and terminal |
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