Recent progress in the development of high-sensitivity tunneling magnetoresistive sensors

2019 ◽  
Author(s):  
Xiaolu Yin ◽  
Yi Yang ◽  
Yen-Fu Liu ◽  
Jiong Hua ◽  
Andrei Sokolov ◽  
...  
Keyword(s):  
Recent Progress ◽  
High Sensitivity ◽  
Magnetoresistive Sensors

Recent progress of dissolved carbon dioxide measurement technologies based on optical methods

2018 ◽  
Vol 41 (8) ◽  
pp. 2374-2385
Author(s):  
Xiang Li ◽  
Qi Wang
Keyword(s):  
Carbon Dioxide ◽  
Greenhouse Effect ◽  
Recent Progress ◽  
High Sensitivity ◽  
Fast Response ◽  
Field Method ◽  
Optical Methods ◽  
Dissolved Carbon ◽  
Carbon Dioxide Measurement ◽  
Dissolved Carbon Dioxide

This paper sums up the developments and achievements of optical methods in the field of dissolved carbon dioxide measurement based on past work. The dissolved CO2 measurement in optical methods is highly applied owing to high sensitivity, fast response and greater versatility with more attention people paid to greenhouse effect. In this article, the measuring is mainly partitioned into fluorescent methods, spectrometric methods and specific optical methods like evanescent field method. Principles, characteristics and structures in previous research are described in detail and our own ideas and perspectives in tendency of dissolved carbon dioxide sensing are emphasized lastly.

scholarly journals Recent Progress in Birdcage RF Coil Technology for MRI System

Diagnostics ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1017
Author(s):  
Sheikh Faisal Ahmad ◽  
Young Cheol Kim ◽  
Ick Chang Choi ◽  
Hyun Deok Kim
Keyword(s):  
Magnetic Resonance ◽  
Recent Progress ◽  
3D Structure ◽  
Larmor Frequency ◽  
High Sensitivity ◽  
Transverse Magnetic ◽  
Rf Coil ◽  
Low Field ◽  
Volume Of Interest ◽  
Magnetic Resonance Imaging Mri

The radio frequency (RF) coil is one of the key components of the magnetic resonance imaging (MRI) system. It has a significant impact on the performance of the nuclear magnetic resonance (NMR) detection. Among numerous practical designs of RF coils for NMR imaging, the birdcage RF coil is the most popular choice from low field to ultra-high field MRI systems. In the transmission mode, it can establish a strong and homogeneous transverse magnetic field B1 for any element at its Larmor frequency. Similarly, in the reception mode, it exhibits extremely high sensitivity for the detection of even faint NMR signals from the volume of interest. Despite the sophisticated 3D structure of the birdcage coil, the developments in the design, analysis, and implementation technologies during the past decade have rendered the development of the birdcage coils quite reasonable. This article provides a detailed review of the recent progress in the birdcage RF coil technology for the MRI system.

scholarly journals Design of a Micromachined Z-axis Tunneling Magnetoresistive Accelerometer with Electrostatic Force Feedback

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 158 ◽  
Author(s):  
Bo Yang ◽  
Binlong Wang ◽  
Hongyu Yan ◽  
Xiaoyong Gao
Keyword(s):  
Magnetic Field ◽  
Force Feedback ◽  
Electrostatic Force ◽  
High Sensitivity ◽  
Magnetic Films ◽  
Magnetic Film ◽  
Field Variation ◽  
Middle Plane ◽  
Main Structure ◽  
Magnetoresistive Sensors

This paper presents the design, simulation, fabrication and experiments of a micromachined z-axis tunneling magnetoresistive accelerometer with electrostatic force feedback. The tunneling magnetoresistive accelerometer consists of two upper differential tunneling magnetoresistive sensors, a middle plane main structure with permanent magnetic films and lower electrostatic feedback electrodes. A pair of lever-driven differential proof masses in the middle plane main structure is used for sensitiveness to acceleration and closed-loop feedback control. The tunneling magnetoresistive effect with high sensitivity is adopted to measure magnetic field variation caused by input acceleration. The structural mode and mass ratio between inner and outer proof masses are optimized by the Ansys simulation. Simultaneously, the magnetic field characteristic simulation is implemented to analyze the effect of the location of tunneling magnetoresistive sensors, magnetic field intensity, and the dimension of permanent magnetic film on magnetic field sensitivity, which is beneficial for the achievement of maximum sensitivity. The micromachined z-axis tunneling magnetoresistive accelerometer fabricated by the standard deep dry silicon on glass (DDSOG) process has a device dimension of 6400 μm (length) × 6400 μm (width) × 120 μm (height). The experimental results demonstrate the prototype has a maximal sensitivity of 8.85 mV/g along the z-axis sensitive direction under the gap of 1 mm. Simultaneously, Allan variance analysis illustrate that a noise floor of 86.2 μg/Hz0.5 is implemented in the z-axis tunneling magnetoresistive accelerometer.

scholarly journals A Versatile Terahertz Chemical Microscope and Its Application for the Detection of Histamine

Photonics ◽  
2022 ◽  
Vol 9 (1) ◽  
pp. 26
Author(s):  
Jin Wang ◽  
Kosuke Sato ◽  
Yuichi Yoshida ◽  
Kenji Sakai ◽  
Toshihiko Kiwa
Keyword(s):  
Cancer Cells ◽  
Chemical Sensing ◽  
Recent Progress ◽  
High Sensitivity ◽  
Label Free ◽  
Terahertz Waves ◽  
Minute Amount ◽  
Low Concentration ◽  
Buffer Solutions ◽  
Small Biomolecules

Terahertz waves have gained increasingly more attention because of their unique characteristics and great potential in a variety of fields. In this study, we introduced the recent progress of our versatile terahertz chemical microscope (TCM) in the detection of small biomolecules, ions, cancer cells, and antibody–antigen immunoassaying. We highlight the advantages of our TCM for chemical sensing and biosensing, such as label-free, high-sensitivity, rapid response, non-pretreatment, and minute amount sample consumption, compared with conventional methods. Furthermore, we demonstrated its new application in detection of allergic-related histamine at low concentration in buffer solutions.

scholarly journals Recent Progress in Microfiber-Optic Sensors

2021 ◽  
Vol 11 (1) ◽  
pp. 45-68
Author(s):  
Wei Luo ◽  
Ye Chen ◽  
Fei Xu
Keyword(s):  
Fiber Optics ◽  
Recent Progress ◽  
Response Times ◽  
Functional Materials ◽  
High Sensitivity ◽  
Fast Response ◽  
Basic Principles ◽  
Area Of Interest ◽  
Compact Size ◽  
Optical Microfiber

AbstractRecently, microfiber-optic sensors with high sensitivity, fast response times, and a compact size have become an area of interest that integrates fiber optics and nanotechnology. Distinct advantages of optical microfiber, such as large accessible evanescent fields and convenient configurability, provide attractive benefits for micro- and nano-scale optical sensing. Here, we review the basic principles of microfiber-optic sensors based on a broad range of microstructures, nanostructures, and functional materials. We also introduce the recent progress and state-of-the-art in this field and discuss the limitations and opportunities for future development.

scholarly journals Linearization strategies for high sensitivity magnetoresistive sensors

2015 ◽  
Vol 72 (1) ◽  
pp. 10601 ◽  
Author(s):  
Ana V. Silva ◽  
Diana C. Leitao ◽  
João Valadeiro ◽  
José Amaral ◽  
Paulo P. Freitas ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Magnetoresistive Sensors

scholarly journals Recent progress for capillary electrophoresis with electrochemical detection

2012 ◽  
Vol 10 (3) ◽  
pp. 639-651 ◽  
Author(s):  
Huan Yu ◽  
Xiaoyu Xu ◽  
Jinying Sun ◽  
Tianyan You
Keyword(s):  
Capillary Electrophoresis ◽  
Electrochemical Detection ◽  
Recent Progress ◽  
Low Cost ◽  
High Sensitivity ◽  
Separation Performance ◽  
Separation Science ◽  
Short Analysis Time ◽  
High Separation ◽  
Important Progress

AbstractCapillary electrophoresis (CE) is an attractive technique in separation science because of its high separation performance, short analysis time and low cost. Electrochemical detection (EC) is a powerful tool for CE because of its high sensitivity. In this review, developments of CE-EC from 2008 to August, 2011 are reviewed. We choose papers of innovative and novel results to demonstrate the newest and most important progress in CE-EC.

scholarly journals Recent Progress on Sensing Application of Metal Nanoarchitectures Enhanced Fluorescence

2021 ◽  
Author(s):  
Meiling Wang
Keyword(s):  
Analytical Method ◽  
Analytical Approach ◽  
Recent Progress ◽  
High Sensitivity ◽  
Enhanced Fluorescence ◽  
Non Invasive ◽  
Target Analytes ◽  
Sensing Application ◽  
Invasive Measurement

Fluorescence analytical method, as a real time and in situ analytical approach to target analytes, can offer advantages of high sensitivity/selectivity, great versatility, non-invasive measurement and easy to transmit over...

scholarly journals Recent Progress in Fiber Optofluidic Lasing and Sensing

2021 ◽  
Vol 11 (2) ◽  
pp. 262-278
Author(s):  
Xi Yang ◽  
Chaoyang Gong ◽  
Yiling Liu ◽  
Yunjiang Rao ◽  
Mateusz Smietana ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Recent Progress ◽  
Signal To Noise Ratio ◽  
Low Cost ◽  
Microfluidic Channel ◽  
High Sensitivity ◽  
Gain Medium ◽  
High Signal ◽  
Biomedical Analysis ◽  
Sensing Applications

AbstractFiber optofluidic laser (FOFL) integrates optical fiber microcavity and microfluidic channel and provides many unique advantages for sensing applications. FOFLs not only inherit the advantages of lasers such as high sensitivity, high signal-to-noise ratio, and narrow linewidth, but also hold the unique features of optical fiber, including ease of integration, high repeatability, and low cost. With the development of new fiber structures and fabrication technologies, FOFLs become an important branch of optical fiber sensors, especially for application in biochemical detection. In this paper, the recent progress on FOFL is reviewed. We focuse mainly on the optical fiber resonators, gain medium, and the emerging sensing applications. The prospects for FOFL are also discussed. We believe that the FOFL sensor provides a promising technology for biomedical analysis and environmental monitoring.

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