Vehicle-mounted pre-polarization field magnetic resonant water source detection device and detection method

Abstract

The invention relates to a vehicle-mounted pre-polarization field magnetic resonant water source detection device and detection method. The device comprises a crawler-type detection vehicle born witha non-metallic detection platform, distributed pre-polarization field detection equipment and multiple detection coils; one channel of a full-wave receiver continuously collects noise for subsequent data processing through a reference coil; a first emitter firstly imports a pre-polarization current polarized water source into an emitting coil at first, a second emitter imports AC in the transientLarmor frequency to the emitting coil to motivate the hydrogen proton in the water after the current is quickly insulated and turned off; when the motivation is stopped, the hydrogen proton returns toan initial state and release a signal; the full-wave receiver collects a magnetic resonant signal on a receiving coil and transmits the magnetic resonant signal to a computer to process. The underwater source is detected by combining a vehicle-mounted way and the pre-polarization field, and the device has the advantages of being high in precision, high in efficiency and low in cost; the fine detection under the complex noise environment can be realized when the large-range quick detection is realized.

Description

technical field [0001] The invention belongs to the research field of geophysical exploration technology, and relates to a vehicle-mounted prepolarization field magnetic resonance water source detection device and a detection method. Background technique [0002] With the urban population gathering, the rapid urbanization process makes the utilization rate of groundwater resources more and more tense. In order to alleviate the tense water shortage situation, the application of reasonable geophysical methods to exploit groundwater is one of the effective solutions. At present, there are many methods for groundwater detection, but there are problems such as poor safety, high cost, easy to be affected by the environment, and limited application range. Magnetic resonance technology is an emerging geophysical method for detecting groundwater sources in recent years. It uses non-invasive detection methods to judge underground hydrogeological information, and has the advantage of ...

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Problems solved by technology

For ground positioning and drilling integrated equipment, although it can simplify the operation process of drilling wells, save manpower, and adapt to various terrain environments, it can only judge the existence of groundwater sources after drilling wells, and the detection range is limited, so it is difficult to realize For the extensive detection of groundwater sources, if multiple wells are drilled, the cost will increase and the detection efficiency will be reduced

The nuclear magnetic resonance groundwater detection system and detection method with a reference coil adopt a variety of signal processing methods to extract the nuclear magnetic signal from the background noise to a certain extent, but because this method still detects the nuclear magnetic resonance groundwater source under the geomagnetic field, the nuclear magnetic signal There is no increase in the source, so it is still difficult to detect effective signals in complex noise environments such as severe power interference and surrounding large-scale excavation projects such as tunnels and mines

A magnetic resonance multi-channel detection method and device that uses a pre-polarization field to enhance the signal amplitude, which uses a pre-polarization field instead of the geomagnetic field, effectively increases the nuclear magnetic signal of the groundwater source, and realizes fine measurement of a certain detection location. However, due to More detection coils and strict wiring methods are used, so it takes a lot of manpower and material resources to lay the wires, the detection cost is high and the flexibility is poor. At the same time, due to the existence of multiple detection coils, the detection efficiency is extremely low, and it is not suitable for large areas. delineation of groundwater sources

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