Portable Magnetic Detectors Based on TMR Sensors

Portable CO2 detectors.

Portable fiber sensors based on surface-enhanced Raman scattering.

Two portable molecular sensing systems based on surface-enhanced Raman scattering (SERS) have been experimentally demonstrated using either a tip-coated multimode fiber (TCMMF) or a liquid core photonic crystal fiber (LCPCF) as the SERS probe. With Rhodamine 6G as a test molecule, the TCMMF-portable SERS system achieved 2-3 times better sensitivity than direct sampling (focusing the laser light...

Contactless Measurement of Magnetic Nanoparticles on Lateral Flow Strips Using Tunneling Magnetoresistance (TMR) Sensors in Differential Configuration

Magnetic nanoparticles (MNPs) are commonly used in biomedical detection due to their capability to bind with some specific antibodies. Quantification of biological entities could be realized by measuring the magnetic response of MNPs after the binding process. This paper presents a contactless scanning prototype based on tunneling magnetoresistance (TMR) sensors for quantification of MNPs prese...

Portable Nanoparticle-Based Sensors for Food Safety Assessment

The use of nanotechnology-derived products in the development of sensors and analytical measurement methodologies has increased significantly over the past decade. Nano-based sensing approaches include the use of nanoparticles (NPs) and nanostructures to enhance sensitivity and selectivity, design new detection schemes, improve sample preparation and increase portability. This review summarizes...

Portable MRI Magnets and Spinning Micro-Detectors

Introduction Development of mobile NMR and MRI has been pursued since the pioneering work on well-logging, in order to reach the performance of high-resolution systems. Permanent magnets are the key to such mobile systems and the development of rare earth NdFeB and SmCo materials allows the generation of high strength magnets. However, most systems currently used are based on bar magnets or Hal...