Interpole-Type Magnetic Navigation System for Actuation of Magnetic Drug

et al. 2023

Opt. Eng.

.High sensitivity magnetic sensing is proposed using a sandwich structure with polydimethylsiloxane (PDMS) flexible resonator as the core. The directional sensing feature is provided by the sandwich structure’s preset magnetic field. The small Young’s modulus of flexible material corresponds to larger variation, resulting in a highly sensitive magnetic response. In the unshielded environment, the experimental results demonstrate redshift sensitivity of 1.08 nm / mT and blueshift sensitivity of 1.12 nm / mT, which are attributed to a slight variation in the PDMS’s Young’s modulus. The directivity curve’s concave point has a depth of 34.6 dB. The minimum detectable magnetic field of 0.96 nT · Hz − 1/2 is achieved at 1.4 kHz.

Section: Introductionmentioning

confidence: 99%

High sensitivity magnetic field sensing via a sandwich-type polydimethylsiloxane resonator

Rong

et al. 2023

Opt. Eng.

“…In recent years, magnetic field sensor devices have been used in various industrial fields such as geological exploration [20], aviation and navigation [21], and medical instruments [22]. Compared with traditional magnetic field sensors, such as sensor devices prepared based on the Hall effect [23], they are limited by the measurement distance and external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

A High-Sensitivity Magnetic Field Sensor Based on PDMS Flexible Resonator

Rong

et al. 2023

Applied Sciences

High-sensitivity resonator magnetic sensing requires a significant magnetostrictive response, while the narrow linewidth mode of a high-Q resonator can provide a high-precision frequency resolution. Therefore, a polydimethylsiloxane (PDMS) flexible resonator with both a low Young’s modulus and high optical transmittance is an ideal platform for realizing high-sensitivity magnetic sensing. Based on the sandwich structure of the PDMS flexible resonator, the mechanism of the magnetic field sensitivity of the PDMS flexible resonator sandwich structure is studied, and the impact of changes in the refractive index and radius on the sensor device is analyzed. In order to optimize the sensitivity of the sensor, when an external magnetic field acts on the sandwich structure, the impacts of three aspects on the sensitivity of the sensor are simulated and analyzed: different coupling positions of PDMS flexible resonator, different radii, and PDMS mixing ratios. The trend of sensitivity change is obtained, and the physical explanation of the sensitivity trend is analyzed. By optimizing these three aspects, the magnetic field sensitivity is eventually calculated as 19.02 nm/mT. Based on the existing experimental conditions and the preparation technology of the PDMS flexible resonator, the measured magnetic field sensitivity is 4.23 nm/mT.

“…ltralow-field magnetometers are essential components for a wide range of practical applications including medical detection, 1) space navigation, 2) and other scientific and technological fields. 3) As a comprehensive subject of optics, electromagnetism, quantum mechanics and other disciplines, weak magnetic detection has attracted extensive attention.…”

mentioning

confidence: 99%

A high sensitivity magnetometer via the combination of ultrahigh-Q fiber cavity and frequency-locking technology

Tao

et al. 2021

Appl. Phys. Express

The optical cavity with high quality factor (Q) has been successfully employed to improve the sensitivity of magnetometer. However, complex system design and tedious data processing hinder the progress of application, since synchronized with other equipments and undergo additional post-processing. To overcome the limitation, we propose a single-loop frequency-locking (SLFL) optomagnetic (OM) signal solution system (SLFL-OMSS). SLFL-OMSS solution obtained a scale factor of 0.17 mV μT−1 and the peak sensitivity is 44.1 fT/Hz1/2 at 200 kHz. SLFL-OMSS reduces the calculating and complexity of the OM sensor system, which provides an efficient way for achieving a high-sensitivity OM sensing.