Redkylin Machinery & Electric Co., Ltd

TitleRedkylin Machinery & Electric Co., Ltd
ProductsMeasurement & meter, circuit breaker
Company typeManufacturer
Websitehttp://www.redkylin.com
Email
Phone86 0577 62798277
AddressNo.75 xinguang Road, xinguang Industrial Zone, Liushi Town, ; Yueqing, Zhejiang, China (Mainland)
Zip325604
CountryChina
ProductsMeasurement & meter, circuit breaker
Num of employees101 - 500 People
Establish year1998
Contact personLucas
MarketsWorldwide
SalesBelow US$1 Million

New breakthrough in surface-based groundwater measurement

(collapsable)→
Wed, 24 Nov 2021 08:10:00

Based on recent breakthroughs in instruments and data modeling, researchers from the Department of Geoscience and the Department of Electrical and Computer Engineering at Aarhus University have collaborated to develop an effective technology to measure groundwater accurately from the surface.

The sends very much cleaner signals than have so far been possible using NMR-based () measurements, and this enables the researchers to make a detailed map of the hydrogeological and geological structure of the subsurface, even in inaccessible areas.

The research has just been published in Geophysical Research Letters.

"Using this new technology, NMR measurements are now a cheap, fast and, above all, very accurate tool for mapping and characterizing groundwater systems. There are problems with groundwater all over the world, and the really good news is that, using this tool, we can better map the groundwater and thereby take better care of it," says Assistant Professor Denys Grombacher from the Department of Geoscience.

Groundwater is a critical source of freshwater for many billions of people, but , pollution and over-exploitation are making it more difficult to find suitable areas as a groundwater source.

NMR measurements are the only technique available today that enable direct non-invasive measurements of the water content and pore properties of the soil.

NMR is short for Nuclear Magnetic Resonance and in short it means that we influence the hydrogen atoms in water molecules in the subsurface using a man-made magnetic on the surface.

Hydrogen atoms have a nuclear spin which, in principle, aligns with the magnetic field of the earth, either with or against the field—just like small magnets. A pulse from the artificially created changes the spin direction of the hydrogen atoms, and when the pulse fades out, the atoms return to the direction they had before. This realignment emits an electromagnetic field that can be measured.

NMR measurements have a disadvantage, however, in that background noise from the electricity grid, for example, can interfere with the signals, and this can make it exceedingly difficult to measure the very weak electromagnetic field in the realignment.

Roughly speaking, the researchers are looking for a whisper-like voice among the audience at a Motörhead rock concert, and this is where the new technologies in the field of data transmission and modeling come into play.

"We can sort of direct the microphone towards the specific sound source we want to hear, and through a number of identical pulses almost 'force' a clear signal from the in the soil. The computer can piece together the signal we receive to an accurate reproduction of the original signal using data modeling," says Associate Professor Jakob Juul Larsen from the Department of Electrical and Computer Engineering.

The research team sees the new technology as a breakthrough in groundwater modeling, and as a quick, stable, reliable and inexpensive alternative for mapping throughout the world.

The is being headed by Associate Professor Jakob Juul Larsen from the Department of Electrical and Computer Engineering and support is from a grant from the Independent Research Fund Denmark of DKK 5.9 million.



More information: D. Grombacher et al, Steady‐state surface NMR for mapping of groundwater, Geophysical Research Letters (2021). DOI: 10.1029/2021GL095381

Citation: New breakthrough in surface-based groundwater measurement (2021, November 24) retrieved 26 November 2021 from https://phys.org/news/2021-11-breakthrough-surface-based-groundwater.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.