Turn-off time calculation method for digital dense sampling transient electromagnetic instrument
A transient electromagnetic instrument, dense sampling technology, applied in the direction of electric/magnetic exploration, instruments, scientific instruments, etc., can solve the problems of complex model, unrealistic application, unscientific and reliable off time, etc., to achieve accurate Turn-off time, the effect of the method is simple and easy to implement
Active Publication Date: 2019-01-18
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 off-time calculation method of this digital intensive sampling transient electromagnetic instrument provided by the present invention comprises the following steps:
[0039] S1. When the intensive sampling transient electromagnetic instrument is sending waveforms, stop supplying power to the intensive sampling transient electromagnetic instrument, and enter the shutdown stage of the intensive sampling transient electromagnetic instrument at this time;
[0040] S2. In the turn-off phase, use the intensive sampling transient electromagnetic instrument to obtain the receiving response, and derive the corresponding time-voltage data for receiving;
[0041] S3. Smoothing the time-voltage data obtained in step S2;
[0042] In specific implementation, the five-point cubic smoothing method can be used to smooth the data, specifically, the following formula is used for smoothing:
[004...
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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 specifically relates to a method for calculating the off time of a digital intensive sampling transient electromagnetic instrument. Background technique [0002] With the development of economy and technology, the country has paid more and more attention to related fields such as geological science and exploration. 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 return line or a grounded line source to send a pulsed electromagnetic field underground. Under the excitation of the primary electromagnetic field, an eddy current is induced inside the underground conductor. During the gap period, 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). The secondary magnetic field ...
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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