Search

Your search keyword '"Cardoso, Susana"' showing total 15 results
Start Over Author "Cardoso, Susana" Journal sensors
15 results on '"Cardoso, Susana"'

2. Hybrid GMR Sensor Detecting 950 pT/sqrt(Hz) at 1 Hz and Room Temperature

Author

Guedes, André, Macedo, Rita, Jaramillo, Gerardo, Cardoso, Susana, Freitas, Paulo P, and Horsley, David A

Subjects
Bioengineering, GMR, MEMS, picotesla, low frequency, heart rate, Analytical Chemistry, Environmental Science and Management, Ecology, Distributed Computing, Electrical and Electronic Engineering
Abstract

Advances in the magnetic sensing technology have been driven by the increasing demand for the capability of measuring ultrasensitive magnetic fields. Among other emerging applications, the detection of magnetic fields in the picotesla range is crucial for biomedical applications. In this work Picosense reports a millimeter-scale, low-power hybrid magnetoresistive-piezoelectric magnetometer with subnanotesla sensitivity at low frequency. Through an innovative noise-cancelation mechanism, the 1/f noise in the MR sensors is surpassed by the mechanical modulation of the external magnetic fields in the high frequency regime. A modulation efficiency of 13% was obtained enabling a final device's sensitivity of ~950 pT/Hz1/2 at 1 Hz. This hybrid device proved to be capable of measuring biomagnetic signals generated in the heart in an unshielded environment. This result paves the way for the development of a portable, contactless, low-cost and low-power magnetocardiography device.

Published
2018

Catalog

Books, media, physical & digital resources
See catalog results