Calculation method of off time for digital intensive sampling transient electromagnetic instrument
A transient electromagnetic instrument and intensive sampling technology, which is applied in the fields of electric/magnetic exploration, instruments, scientific instruments, etc., can solve problems such as complex models, impractical practical applications, and unscientific and reliable off-times. The effect of simple and accurate off-time
Active Publication Date: 2020-05-05
HUNAN WUWEI GEOLOGICAL SCI & TECH CO LTD
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[0006] However, the current judgment method for the turn-off time of the transient electromagnetic instrument is either too theoretical (the first method), not only the model is complicated, but also very impractical in actual application; or it is too subjective and relative Random (the second method), its recorded off time is not scientific and reliable
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[0038] Such as figure 1 Shown is the method flow chart of the method of the present invention: the method for calculating the turn-off time of the digital dense sampling transient electromagnetic instrument provided by the present invention includes the following steps:
[0039] S1. When the dense-sampling transient electromagnetic instrument is sending waveforms, it stops powering the dense-sampling transient electromagnetic instrument and enters the shutdown phase of the dense-sampling transient electromagnetic instrument;
[0040] S2. In the shutdown phase, use the dense sampling transient electromagnetic instrument to obtain the receiving response, and derive the time-voltage data of the receiving response;
[0041] S3. Smoothing the time-voltage data obtained in step S2;
[0042] In specific implementation, you can use the five-point three-time smoothing method to smooth the data, specifically using the following formula for smoothing:
[0043] VV(1)=(69*V(1)+4*(V(2)+V(4))-6*V(3)-V...
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The invention discloses a turn-off time calculation method for a digital dense sampling transient electromagnetic instrument. The method comprises the following steps: stopping supplying power when the dense sampling transient electromagnetic instrument transmits a waveform, and entering a turn-off stage; acquiring a receiving response and deriving corresponding time-voltage data; smoothing the time-voltage data; fitting the smoothed time-voltage data to obtain a fitting equation; and calculating a maximum value of the fitting equation, wherein the time corresponding to the maximum value is the turn-off time of the dense sampling transient electromagnetic instrument. The method provided by the invention can more accurately obtain the turn-off time of the dense sampling transient electromagnetic instrument, and the method is simple and feasible, scientific and reliable.
Description
Technical field [0001] The invention particularly relates to a method for calculating the off time of a digital dense sampling transient electromagnetic instrument. Background technique [0002] With the development of economy and technology, the country has paid more and more attention to geological sciences, exploration and other related fields. Geological exploration technology has also been very well developed. [0003] The transient electromagnetic method belongs to the time domain electromagnetic method. This method uses an ungrounded loop or ground line source to send a pulse electromagnetic field to the ground. Under the excitation of the primary electromagnetic field, the underground conductor is induced to generate eddy currents. During the gap, the secondary magnetic field generated by the eddy current will not disappear immediately with the disappearance of the primary field (that is, there is a transient process). Use the coil or ground electrode to observe the second...
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IPC IPC(8): G01V3/38G01R23/16
CPCG01R23/16G01V3/38
Inventor 席振铢龙霞黄龙周胜亓庆新陈兴朋邝金坚侯海涛李娜
Owner HUNAN WUWEI GEOLOGICAL SCI & TECH CO LTD