1.Overview

Natural electric field frequency selection method, referred to as frequency selection method. It is based on the differences of electrical properties of mineral rocks underground, through measuring the natural frequency magneto telluric election (Frequency 0.n-30 kHz), and according to the regular variation of different frequencies of electromagnetic fields, to research the situation under ground, it is an alternating current exploration methods, in order to solve geological exploration problems. The instrument is Natural Electric Field Frequency Selection Geophysical Measuring instrument (Frequency Selection Instrument)

Frequency Selection Instrument is mainly new in cities, mountains and plains to quickly find and analyze groundwater (e.g. magma tic water, bedrock fracture spring, quaternary and tertiary phreatic water). To solve geological problems, such as to find and identify the natural or artificial caves (e.g. natural caves, soil cave, tomb, bomb shelters, Coal Mine, coal mine water inrush); to find the fault under the cover and fracture zone; stability analysis of building foundation; find and identify objects buried underground (e.g. water pipes, gas pipes, cast iron or concrete pipes, cables); to find quartz vein or fracture zone goldmine, and so on. Practice has proved Frequency Selection Instrument has received significant geological effects in solving the above geological problems.

Features:

Fast—easy and convenient instrument, easy operation, walk for sampling, and data can be recorded, printed and interpreted in the exploration site. Just in 1-2 days Frequency Selection Instrument can make sure wells location and solve the other geological problems.

Thrift—No need power supply equipment and more staff, saving cost. Only 1-2 people can operate and complete exploration tasks.

Effect—Effect of geological exploration. Exploration using multi-frequency measurements, access to large amounts of geological exploration data and abnormal curves, more accurate and high success rate.

Anti-interference ability— exploration even in cities with serious interference, Frequency Selection Instrument also normal works and still gets good geological exploration effects.

Based on many years experience of designing and manufacturing Frequency Selection Instrument, and Science-First, People-oriented, now we design new product TX-MPI Automatic Natural Electric Field Frequency Selection Geophysical Measuring instrument. TX-MPI is digital automatic instrument, super anti-interference ability, completely ruled out human error, can measure up to 30 frequency data, easy operation and LCD screen, detection electrode and power monitoring, and so on.

2. Specifications

Product Configuration

·5 inch LCD screen, support 240*128 dot matrix

·Intelligent controller, 22MHz frequency

·High sensitivity, high impedance, differential input probe

·Tri-band beneficiation technology

·50Hz/60Hz filtration technology, eliminate frequency interference

·Save up to 10 groups of measurement data, each measurement data contains up to 16 data

·Simple time display and temperature display

·Support for external serial printer (special type)

·Built-in battery 12V/1.2AH

·Support two kinds of chargers: AC-DC 12V charger and DC 12V dedicated car charger

Product parameters

♦ Frequency: (Hz C/S)

Three-frequency measurement: Each measuring point measures the following three frequency data: 25;67;170

Multi-frequency measurements: A measuring point for fixed-point measurement, measuring the following 30 frequency data:

20;30;40;50;60;70;80;90;100;110;120;130;140;150;170;190;210;230;250;300;350;400;460;500;700;900;1100;1300;1500;2000

Each frequency range allows the election: Center frequency ±1%

♦ Measurement parameters: Magneto telluric different frequencies electric field component ΔV ⊥s,ΔV"s (mV)

♦ Measuring range: 1 uV-250mV, instrument automatically converted range

♦ Input impedance: >10MΩ

♦ Power: 12V/1.2AH battery

♦Work environment: Temperature (-10°C—+45°C), relative humidity: ≤85%

♦Weight: 13 KG

♦ Size: 24CM X 13CM X 16CM

3. Introduction of instrument works

TX-MPI Mine Locator exploration method is Natural Electric Field Frequency Selection Geophysical Measuring Method, it is using Magneto telluric as working electromagnetic field source, based on ground resistivity differences between rocks and minerals, and research electrical changes of underground geoelectric section according to several or dozens of different frequency variations of the electric field component, which is Alternating Current Geological Exploration Methods. Because the electric fields measured are magneto telluric electrical components, it is called Natural Electric Field; and because when operating the instrument selects several or dozens of low-frequency electric field component as measurement parameter, then it is named Frequency Selection Method; and the exploration method is named Natural Electric Field Frequency Selection Method. Magneto telluric Signal is Input to Impedance input stage by IN (A/B) electrode probe (sensor) via cable, after attenuation Alternating Current is enlarge, and frequency selection, select the required operating frequency signal, and then after AC-DC converter A/B sampling and CPU data processing (e.g. anti-Interference data processing). In the course of the entire operation, under the control of CPU, the instrument is automatic range switching and automatic frequency selection. Finally, measurements are showing on the LCD screen. Analyze depending on the anomaly curves and measurement data to make geological conclusions