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Dr. Jie Xu

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Guest Editor

College of Physics, Qingdao University, Qingdao 266071, China
Interests: magnetic biosensor; magnetoelectric sensors

Prof. Dr. Shandong Li

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Guest Editor

National Demonstration Center for Experimental Applied Physics Education, Qingdao University, Qingdao 266071, China
Interests: magnetism and magnetic materials; superconducting materials and devices; microwave materials and devices; biosensors
Special Issues, Collections and Topics in MDPI journals

Dr. Xuekui Xi

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Guest Editor

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Interests: optical fiber magnetoelastic sensors

Special Issue Information

Dear Colleagues,

With the progress of science and technology, the demand for sensors is increasing day by day. Among them, magnetic sensors are a special kind of sensors, which are widely used in automobile, aerospace, the Internet of Things, consumer electronics and other industries. In recent years, traditional magnetic sensors based on magnetoresistance, electromagnetic induction and other principles, such as the Hall effect, giant magnetoresistance, tunneling magnetoresistance, fluxgate meter, etc., have had their performance improved. Sensors based on novel principles, such as diamond NV-center magnetometers, optical pumping atomic magnetometer, superconducting quantum interference magnetometer, magnetoelectric coupling effect, magneto-optical effect, optical fiber magnetoelastic composite sensor, are developing rapidly. This Special Issue aims to collect the latest research progress of traditional and novel sensors, as well as their latest application progress in biological detection, weak magnetic field measurement, resource exploration, nondestructive testing and other fields, and to provide a platform for scientists to engage in the research and application of magnetic sensors and to exchange and display knowledge. All research works on magnetic sensors and their applications are welcome in this Special Issue.

Dr. Jie Xu
Prof. Dr. Shandong Li
Dr. Xuekui Xi
Guest Editors

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Keywords

magnetic sensors
application of magnetic sensors
novel principle magnetic sensors
weak magnetic field detection
biosensors
geophysical detection

Published Papers (2 papers)

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Research

20 pages, 9021 KiB

Open AccessArticle

Measuring the Canopy Architecture of Young Vegetation Using the Fastrak Polhemus 3D Digitizer

by Kristýna Šleglová, Jakub Brichta, Lukáš Bílek and Peter Surový

Sensors 2024, 24(1), 109; https://doi.org/10.3390/s24010109 - 25 Dec 2023

Viewed by 677

Abstract

In the context of climate change conditions, addressing the shifting composition of forest stands and changes in traditional forest management practices are necessary. For this purpose, understanding the biomass allocation directly influenced by crown architecture is crucial. In this paper, we want to demonstrate the possibility of 3D mensuration of canopy architecture with the digitizer sensor Fastrak Polhemus and demonstrate its capability for assessing important structural information for forest purposes. Scots pine trees were chosen for this purpose, as it is the most widespread tree species in Europe, which, paradoxically, is very negatively affected by climate change. In our study, we examined young trees since the architecture of young trees influences their growth potential. In order to get the most accurate measurement of tree architecture, we evaluated the use of the Fastrak Polhemus magnetic digitizer to create a 3D model of individual trees and perform a subsequent statistical analysis of the data obtained. It was found that the stand density affects the number of branches in different orders and the heights of the trees in the process of natural regeneration. Regarding the branches, in our case, the highest number of branch orders was found in the clear-cut areas (density = 0.0), whereas the lowest branching was on-site with mature stands (density = 0.8). The results showed that the intensity of branching (assessed as the number of third-order branches) depends on the total number of branches of the tree of different branch orders but also on stand density where the tree is growing. An important finding in this study was the negative correlation between the tree branching and the tree height. The growth in height is lower when the branching expansion is higher. Similar data could be obtained with Lidar sensors. However, the occlusion due to the complexity of the tree crown would impede the information from being complete when using the magnetic digitizer. These results provide vital information for the creation of structural-functional models, which can be used to predict and estimate future tree growth and carbon fixation. Full article

(This article belongs to the Special Issue Novel Magnetic Sensors and Applications)

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11 pages, 3705 KiB

Open AccessArticle

High-Resolution Magnetoelectric Sensor and Low-Frequency Measurement Using Frequency Up-Conversion Technique

by Kunyu Sun, Zhihao Jiang, Chengmeng Wang, Dongxuan Han, Zhao Yao, Weihua Zong, Zhejun Jin and Shandong Li

Sensors 2023, 23(3), 1702; https://doi.org/10.3390/s23031702 - 3 Feb 2023

Cited by 3 | Viewed by 1807

Abstract

The magnetoelectric (ME) sensor is a new type of magnetic sensor with ultrahigh sensitivity that suitable for the measurement of low-frequency weak magnetic fields. In this study, a metglas/PZT-5B ME sensor with mechanical resonance frequency

f_{r e s}

of 60.041 kHz was [...] Read more.

f_{r e s}

of 60.041 kHz was prepared. It is interesting to note that its magnetic field resolution reached 0.20 nT at

f_{r e s}

and 0.34 nT under a DC field, respectively. In order to measure ultralow-frequency AC magnetic fields, a frequency up-conversion technique was employed. Using this technique, a limit of detection (LOD) under an AC magnetic field lower than 1 nT at 8 Hz was obtained, and the minimum LOD of 0.51 nT was achieved at 20 Hz. The high-resolution ME sensor at the sub-nT level is promising in the field of low-frequency weak magnetic field measurement technology. Full article

(This article belongs to the Special Issue Novel Magnetic Sensors and Applications)

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