CN2786645Y

CN2786645Y - Earthquake pre-phenomenon electromagnetic wave detector

Info

Publication number: CN2786645Y
Application number: CN 200420095977
Authority: CN
Inventors: 廖华康; 刘庆东; 邱熙; 许勤; 司徒建彬
Original assignee: FOSHAN EARTHQUAKE BUREAU
Current assignee: FOSHAN EARTHQUAKE BUREAU
Priority date: 2004-12-06
Filing date: 2004-12-06
Publication date: 2006-06-07
Anticipated expiration: 2014-12-06

Abstract

The utility model relates to an earthquake pre-phenomenon electromagnetic wave monitoring instrument which comprises an electromagnetic wave signal probe, a machine casing, buttons on the machine casing, indicating lamps on the machine casing, a display screen on the machine casing, and a control circuit in the machine casing, wherein the control circuit comprises a conventional single chip computer control circuit, an analog-digital converting circuit, a clock circuit, a keyboard input circuit, a communication control circuit and an LED display circuit. The utility model is also provided with a digital filter circuit of which the filtering is greater than the frequency of 20HZ. Signals obtained by the electromagnetic wave signal probe are first input into a primary amplifying circuit, are transmitted to the digital filter circuit of which the filtering are greater than the frequency of 20HZ, are amplified by a secondary amplifying circuit, are input into the analog-digital converting circuit, and finally are transmitted to the single chip computer control circuit again, and recorded results are stored in an E2PROM memory. The utility model has the characteristics of low cost, high automatization degree, capability of remote transmission of data, simpleness, convenience, practicability and advance. Besides, the utility model solves the problems that local earthquake departments automatically monitor earthquakes, quickly transmit data, etc.

Description

Earthquake precursors electromagnetic wave monitor

Technical field

The utility model relates to the instrument of a kind of acquisition and recording electromagnetic impulse relevant with earthquake.

Background technology

Lot of domestic and international earthquake example and laboratory all confirm the earthquake radiation that all generates electromagnetic waves in preparation process, electromagnetic wave will become one of a kind of earthquake short forecasting means likely.Therefore, write down and analyze ultra-low frequency electromagnetic wave and change, can understand the change procedure of earthquake preparation, generation, thereby carry out seismic monitoring and forecast.

At present, the instrument of China earthquake department recording electromagnetic wave has two kinds of analog record and digital recordings, and the instrument of digital recording also has several types, needs towards different research units.Some instrument is all preserved the frequency of each waveform of electromagnetic wave and amplitude get off, and causes data volume very huge, and instrument will relate to external units such as computing machine, hard disk, and cost is very high; Some instrument is not preserved the electromagnetic wave that is lower than a certain boundary, only preserve beyond the mark, thereby reduce data volume, but this instrument still must be with storage mediums such as hard disks for auxiliary, cost is also higher; Many electromagnetic wave instruments do not provide the ability of remote transmission data, can not realize networking; Even also there are some instruments can the remote transmission data, connect computing machine and just can finish but must rely on, increased the failure rate of transport communication; Also have the enlargement factor of some instrument input signals to immobilize or arbitrarily change, this is unfavorable for that the data of many instruments compares under the varying environment, reduces the analysis utilization.

The utility model content

The purpose of this utility model is the weak point that overcomes above-mentioned prior art, and a kind of working stability, few, the easy installation of fault, simple to operate, manageable are provided, and is convenient to the earthquake precursors electromagnetic wave monitor of analyzing and processing.And, can have the remote transmission data capability, transmit fast so that realize data.

The purpose of this utility model is achieved by the following technical solution: earthquake precursors electromagnetic wave monitor, include the electromagnetic wave signal probe, casing, button on the casing, pilot lamp, display screen, and be loaded on control circuit in the casing, wherein control circuit includes conventional single chip machine controlling circuit, analog to digital conversion circuit, clock circuit, the keyboard input circuit, communication control circuit, the LED display circuit, single chip machine controlling circuit is a governor circuit, by the one chip microcomputer chip, memory, code translator, address latch and peripheral cell thereof are formed, it is characterized in that: also be provided with the digital filter circuit of filtration greater than 20 hertz frequencies, the signal that the electromagnetic wave signal probe obtains is input one-level amplifying circuit earlier, send into the digital filter circuit of filtration again greater than 20 hertz frequencies, amplify through second amplifying circuit again, import modulus (A/D) change-over circuit then, send into single chip machine controlling circuit again, the result of record deposits E in ²The PROM memory.Further, also be provided with the computer interface circuit, the serial interface circuit output by single chip machine controlling circuit connects desk-top computer.

The utility model has the advantages that: have good filter action for frequency greater than 20 hertz; Preserve pulse and both caught the characteristics of pulse, alleviated data volume again in the method for the pulse number of four strength ranges; Instrument has characteristics such as stable and reliable operation, operation continuous rate height, installation and maintenance be easy; Possessed dialing teledata calling function, realized the observation of digitizing unmanned.It is to be suitable for a kind of earthquake monitor device of promoting the use of in local earthquake department.

Description of drawings

Fig. 1 is a schematic appearance of the present utility model;

Fig. 2 is a circuit block diagram of the present utility model;

Fig. 3 is circuit theory diagrams of the present utility model;

Fig. 4 is circuit theory diagrams of the present utility model.

Embodiment

This electromagnetic wave monitor has adopted advanced electronic technology, computer technology and mechanics of communication.Instrument is formed to be had: single chip machine controlling circuit, amplifying circuit, digital filter circuit, modulus (A/D) change-over circuit, real time clock circuit, keyboard input circuit, automatic reset circuit, computer interface circuit, communication control circuit, LED display circuit.Wherein, single chip machine controlling circuit is the governor circuit of instrument, is made up of one chip microcomputer chip, memory, code translator, address latch and peripheral cell thereof.

Single chip machine controlling circuit is the core of instrument, and it is by computer processor CPU-78E52 and E ²PROM memory AT28C256 and other peripheral cells are formed, and record is the result be stored in the memory, and CPU is responsible for handling functions such as pulse classification, statistics, video data, data communication, button processing.

The firsts and seconds amplifying circuit mainly is made up of the instrument measurement amplification chip I NA126P and the LM32 of special use, has designed high precision, high stability, low-power consumption, the low both-end input amplifying circuit that drifts about, 8000 times of enlargement factors.The secondary amplification design becomes 1 to 9 times, and the user can be provided with by the button on the instrument panel.

Filtering circuit for the interference component beyond filtering 0～20 hertz, adopts eight rank switched capacitor digital filtering chip MAX294 of U.S. MAXIM company and LM324 to form, and is designed to the high-precision high-order low-pass filter that a break frequency is set flexibly.

Modulus (A/D) change-over circuit mainly by 4053 and TLC549 form, the size conversion of analog voltage signal is become digital form.

Real time clock circuit mainly is made up of U.S. DALLAS company real-time timepiece chip, has century-old calendar, walking as usual after the power down, the accuracy of assurance Time of Day.

The LED display circuit is made up of 74HC595, and six LED demonstrations are used to show Monitoring Data and time on date.

The keyboard input circuit is made up of 74HC245 and 74HC30, and six input buttons are finished functions such as consulting data, setting-up time and setting enlargement factor.

Automatic reset circuit, adopt the μ P monitoring chip of U.S. XICOR company, designed a microcomputer monitoring circuit that integrates electrification reset, Power Supply Monitoring, WATCHDOS (house dog) circuit, can under program out of control, wake CPU automatically up and reenter normal measuring task work.

Communication control circuit adopts network link controller NETJET Communication Control card, utilizes telephone wire can finish functions such as dialing, transmission data, on-hook.

Voltage-stabilized power supply circuit is made up of rectification, filtering and LM7806 etc., and is connected to the non-maintaining charging backup battery of dry type 6V, guarantees that power supply is stable lasting.

The computer interface circuit, the serial interface circuit output by single chip machine controlling circuit connects desk-top computer.

Principle of work and flow process

This instrument is an electromagnetic impulse number of times digitized record instrument, and record is per hour added up once result per hour less than the pulse number of 20 hertz of electromagnetic impulses four strength ranges.The principle of work and the flow process of instrument are: the electromagnetic wave signal reception of being popped one's head in, the faint voltage signal of coil-induced generation in the probe is through the input port input of cable from instrument.Instrument was with 0.05 second time interval received signal, and signal is after one-level is amplified 8000 times, and the amplitude of signal is improved greatly, and afterwards, signal is rejected frequency through wave filter greater than 20 hertz signal, keeps 20 hertz of signals that reach with lower frequency.These signals are amplified once more, and enlargement factor is 1 to 9 times, and the signal after at this moment amplifying remains analog quantity, through after the analog to digital conversion, has obtained a voltage amplitude value with numeral.This numerical value is sent in the CPU microprocessor by data line, gives CPU and adds up and handle.CPU judges this voltage amplitude value earlier, respectively relatively it and four strength ranges (greater than 0 volt, greater than 1.5 volts, greater than 3 volts, greater than 4.5 volts) size, if more than or equal to certain strength range, just at the corresponding interim statistic unit of CPU, the increase of pulse recording number of times once.Circulation like this is constantly worked, and adds up singly, and after full one hour, CPU puts into E2PROM memory units corresponding to the result of statistics and preserves, the interim statistic unit zero clearing of CPU, and the pulse that begins next hour is again added up.Like this, just realized writing down in every month less than the pulse change number of times of 20 hertz of electromagnetic wave pulses hourly four strength ranges.Because memory is set as and fixes depositing one day unit sometime, like this, instrument can per hour upgrade its pairing cell data in chronological order, only upgraded once in every month, be that the data of certain month will be maintained to the same time of next month and just be updated, so data can be preserved one month in instrument.

Function:

Instrument of the present utility model has 8 earthquake precursors monitoring stations this instrument successively has been installed in Foshan City's scope, unattended surveillance has been realized at ordinary times without the personal management in the monitoring station; The monitoring center that is located at city seismological bureau regularly receives data to 8 monitoring stations by telephone wire, has realized that data transmit fast; Use supporting computer software to carry out further analyzing and processing to Monitoring Data, very efficient and convenient.Confirm that through the expert this instrument received once the electromagnetic wave change information relevant with earthquake generating process, thus ready in advance measure.The instrument development success has improved city's earthquake monitoring and forecasting ability greatly, and loss, guarantee people property life security to earthquake monitoring and forecasting, minimizing earthquake cause society embody the huge social benefit.

Characteristics of the present utility model are: the one, and effectively filtering keeps 20 hertz and reaches greater than 20 hertz frequency pulse Following frequency; The 2nd, preserve per hour less than the pulse number of 20 hertz of electromagnetic pulses four strength ranges; The 3rd, record is the result can preserve one month in instrument, can not lose because having a power failure or moving; The 4th, preserve in the instrument Data can consult, be connected with computer or obtain by three kinds of modes of telephone wire remote transmission by manual; The 5th, The multiplication factor of instrument input signal is that digitlization is adjustable, is convenient to data contrast property. This instrument cost is low, oneself Movingization degree height, can the remote transmission data, demonstrate fully easy, practical, advanced characteristic, solved the place Seismological department is carried out the problems such as automation seismic monitoring, rapid data transmission, for improving local seismic work department monitoring capability Created condition.

Claims

1, earthquake precursors electromagnetic wave monitor, include the electromagnetic wave signal probe, casing, button on the casing, pilot lamp, display screen, and be loaded on control circuit in the casing, wherein control circuit includes conventional single chip machine controlling circuit, analog to digital conversion circuit, clock circuit, the keyboard input circuit, communication control circuit, the LED display circuit, single chip machine controlling circuit is a governor circuit, by the one chip microcomputer chip, memory, code translator, address latch and peripheral cell thereof are formed, it is characterized in that: also be provided with the digital filter circuit of filtration greater than 20 hertz frequencies, the signal that the electromagnetic wave signal probe obtains is input one-level amplifying circuit earlier, send into the digital filter circuit of filtration again greater than 20 hertz frequencies, amplify through second amplifying circuit again, import modulus (A/D) change-over circuit then, send into single chip machine controlling circuit again, the result of record deposits the E2PROM memory in.

2, electromagnetic wave monitor according to claim 1 is characterized in that also being provided with the computer interface circuit, and the serial interface circuit output by single chip machine controlling circuit connects desk-top computer.