Hydrocarbon polluted shallow groundwater magnetic resonance detection device and hydrocarbon polluted shallow groundwater magnetic resonance detection method

Abstract

The invention relates to a hydrocarbon polluted shallow groundwater magnetic resonance detection device and a hydrocarbon polluted shallow groundwater magnetic resonance detection method. According to the detection device, a computer is respectively connected with a transmission logic and control unit, an MCU (Microprogrammed Control Unit) and a signal acquisition card; a 24V battery is connected with a signal regulation circuit by virtue of a DCDC (Direct Current Direct Current) module, a transmission logic and control unit, the MCU and the signal acquisition card; an energy storage transmission unit is connected with the transmission logic and control unit; the energy storage transmission unit is connected with the signal regulation circuit by virtue of a voltage-current acquisition unit 7 and the MCU. By adopting the detection device, non-intrusive quantitative qualitative measurement is achieved, and testing result can be rapidly obtained on site. The intensity of a local magnetic field is improved by virtue of a permanent magnet, magnetic resonance measurement can be carried out at places with intensive electric power interference, the signal to noise ratio can be effectively improved, the constraint that the magnetic resonance exploration cannot be carried out because of intensive electric power interference is broken, and the defect that the result is not correct because of nonuniform magnetic field can be effectively overcome by use of spin echo pulse. Hydrocarbon pollution within 5m underground can be rapidly and accurately detected.

Description

Technical field: [0001] The invention relates to a water pollution detection device and a working method, in particular to a device and a detection method for detecting hydrocarbon-polluted shallow groundwater by nuclear magnetic resonance for non-invasive measurement. Background technique: [0002] For the detection of hydrocarbon pollution in groundwater, digging holes for sampling and analysis is the main analysis method at present. The detection and monitoring of environmental pollution are still concentrated on the visible part of the ground. The main detection methods for hydrocarbon water pollution include chromatography, infrared light method, Ultraviolet light method, fluorescence method, colorimetry and other physical and chemical methods, the main disadvantages of these methods are the need for sampling and analysis, anti-locking of the extraction and testing process, expensive instruments, etc., and the most important thing is that they are all invasive measuremen...

AI Technical Summary

Problems solved by technology

At present, there is no instrument to detect groundwater pollution by this method, and the application of nuclear magnetic resonance technology to the detection of hydrocarbon pollution in groundwater will surely gain a very good development prospect

[0004] CN2528015Y discloses the "underground water resource pollution detection device". By drilling a well, a casing is placed in the well wall, and a conductive line connected to the ground console is built in the casing. Several detectors are distributed on the conductive line for real-time and continuous groundwater pollution detection. , although the device has many functions, strong real-time and continuous advantages, it can only be detected at a specific location, and it needs to drill wells, which is time-consuming, laborious and inefficient to operate.

However, this instrument is also a traditional magnetic resonance water finding method, which cannot be used in places with large power interference such as cities, and because of its transmission waveform problem, it can neither effectively overcome the unevenness of the geomagnetic field, nor can it distinguish underground water according to the returned signal. water or oil

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