Helicopter magnetic resonance and transient electromagnetic combined detection device and method
A transient electromagnetic and detection device technology, which is applied in the fields of electronic magnetic resonance/nuclear magnetic resonance detection, measurement devices, and electric/magnetic exploration, etc., can solve the problems of limited action range of pre-polarization field and difficulty in large-scale groundwater exploration. , to achieve the effect of improving the detection signal-to-noise ratio, high efficiency and high precision
Inactive Publication Date: 2018-11-30
JILIN UNIV
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However, this invention is mainly aimed at the detection of oil and gas leakage in shallow layers, and the ran
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Embodiment 1
[0062] The combined detection method of helicopter magnetic resonance and transient electromagnetic is a detection method with high efficiency and high precision, which is suitable for regional hydrogeological detection. The transmitting coil 4 and the receiving coil 5 are hoisted under the helicopter 1, and the The magnetic resonance operating parameters are set, and by controlling the main control unit 7 in the onboard control box 3, the transmission switching circuit 10 is switched to the MRS transmitter 8, and an alternating current of variable frequency and variable current is passed into the transmitting coil 4 to form adiabatic pulses The hydrogen nuclei in groundwater are excited to generate magnetic resonance. After the excitation is stopped, the main control unit 7 in the onboard control box 3 controls the receiver 11 to collect the magnetic resonance relaxation signal induced by the receiving coil 5, and transmits it to the host computer 2 for storage. After the magn...
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The invention discloses a helicopter magnetic resonance and transient electromagnetic combined detection device and method. The helicopter magnetic resonance and transient electromagnetic combined detection method comprises the steps that the upper portion of a detected area carries a transmitting coil and a receiving coil through a helicopter; a variable-frequency converting current with the local Larmor frequency as the reference is introduced into the transmitting coil, thus heat-insulation pulses are formed, and a hydrogen nucleus in groundwater is stimulated to generate the magnetic resonance phenomenon; after stimulation is stopped, the hydrogen nucleus self-rotates to generate the relaxation phenomenon, and the receiving coil inducts a magnetic resonance signal generated by macroscopic magnetic moment precession; a main control unit controls a receiving machine to receives the magnetic resonance signal, and the magnetic resonance signal is transmitted to an upper computer to bestored; after magnetic resonance detection is completed, a periodic pulse sequence is introduced into the transmitting coil, and the sequence is quickly turned off to form a primary field; and the primary field is spread in dielectric media with different electrical properties and reflected to generate a secondary field, and the receiving coil inducts a transient electromagnetic signal formed by the secondary field. According to the helicopter magnetic resonance and transient electromagnetic combined detection device and method, the problems that traditional magnetic resonance and transient electromagnetic combined detection is low in efficiency and is limited in application occasion are solved.
Description
technical field [0001] The invention relates to a geophysical detection device and method, in particular to a device and a detection method for rapidly detecting groundwater resources by using helicopter magnetic resonance and transient electromagnetic fields. Background technique [0002] The combined detection of Magnetic Resonance Sounding (MRS) and Transient Electromagnetic (TEM) is one of the effective ways to improve the detection accuracy of magnetic resonance aquifers. However, the existing MRS-TEM joint detection methods are mainly suitable for ground conditions, and it is difficult to achieve efficient and large-scale regional hydrogeological exploration. [0003] CN1936621 discloses a nuclear magnetic resonance and transient electromagnetic combined instrument and its method, which realizes two detection methods of nuclear magnetic resonance and transient electromagnetic through one instrument. First, the transient electromagnetic technology is used to find the u...
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Login to view more IPC IPC(8): G01V3/14G01V3/10
CPCG01V3/10G01V3/14
Inventor 林婷婷杨玉晶陈健万玲腾飞林君
Owner JILIN UNIV
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