Time-domain ground-air electromagnetic detection system and calibration method

Abstract

The invention relates to a time-domain ground-air electromagnetic detection system and a calibration method, in particular to a system consisting of an induction signal recording device connected with a ground recording device global position system (GPS) synchronization unit, a closed abnormal ring and a data quality evaluation system, and a calibration method for the time-domain ground-air electromagnetic detection system. The closed abnormal ring and the induction signal recording device are adopted, the induction current and induction voltage are simultaneously recorded, and the 24-bit 200Hz sampling rate, a bandwidth of 0-13KHz and a dynamic range of an amplifier of 160dB are achieved. Moreover, the system is synchronous with a ground transmitter and an air receiver GPS, and during measurement, by removing earth background field data, a pure closed abnormal ring electromagnetic signal containing a geometric error is extracted, is input into the data quality evaluation system, andis compared and fitted with the computed closed abnormal ring theoretical value, the system error, the geometric parameter error and the detection resolution of the time-domain ground-air electromagnetic detection system are determined, and the performance of the electromagnetic detection system is tested and calibrated.

Description

Technical field: [0001] The invention relates to a geophysical instrument exploration instrument and calibration, in particular to a time-domain ground-space electromagnetic detection system and a calibration method. Background technique: [0002] The ground-air electromagnetic detection method has the advantages of high signal-to-noise ratio, good spatial resolution, convenient field construction, economy, and high efficiency. , Large depth detection. [0003] Australia 847270G01V003116 discloses the method of aerial reconnaissance through the transition process method of laying loops on the ground. A transmitting device is placed on the pre-determined target body on the ground to emit a transitional electromagnetic pulse. The flying instrument with the receiver flies over the receiving device in the measured area. Measure the electromagnetic field caused by the above-mentioned transitional electromagnetic pulse, form a signal and an instantaneously measurable electromagne...

AI Technical Summary

Problems solved by technology

Since these testing methods cannot accurately calculate the theoretical electromagnetic response of the ore body, they can only qualitatively judge abnormalities based on the measured profile curves to verify the effectiveness of the measurement system detection; known mining area", so the cost of the experiment is relatively high, and it is also necessary to prevent accidental dangers

These experiments cannot simulate other different geoelectric models, so they are not universal

[0007] To sum up the above, the existing technology only proposes the ground-space electromagnetic detection method, and there is no test and calibration of the time-domain ground-space electromagnetic detection system. Moreover, the time-domain electromagnetic detection systems developed by different countries and companies must have differences and differences in performance. characteristics, various electromagnetic detection systems are not comparable in minimum resolution, signal-to-noise ratio, etc. not the same standard

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