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The development of a DC magnetic field sensor based on a magnetoelectric (ME) PVDF/Metglas composite is reported. The ME sensing composite has an electromechanical resonance frequency close to 25.4 kHz, a linear response (r2 = 0.997) in the 0–2 Oe DC magnetic field range, and a maximum output voltage of 112 mV (ME voltage coefficient α33 of ≈30 V·cm−1·Oe−1). By incorporating a charge amplifier,...
Pulmonary function is reduced in people with impaired mobility. Remotely, unobtrusive respiratory function monitoring can reduce cost and enhance healthcare quality, safety and efficiency for people with motor activity impairments. The paper describes two systems for remote monitoring of respiratory function and indoor air quality: a mobile wearable solution based on EMFi sensing technology, and a...
This paper presents a low-cost tide measurement system based on a set of two inclinometers. The inclination sensors deliver a DC output voltage which varies linearly with the angle of its working direction. Thus, with two inclinometers assembled in orthogonal directions, it is possible to provide the tide direction and intensity. The tide measurement system was developed for a stand alone operation...
This paper presents a low-cost tide measurement system based on a set of two inclinometers. The inclination sensors deliver a DC output voltage which varies linearly with the angle of its working direction. Thus, with two inclinometers assembled in orthogonal directions, it is possible to provide the tide direction and intensity. The tide measurement system was developed for a stand alone operation...
Calibration and linearization are two important topics that must always be considered to assure measurement system's accuracy. Measurement errors, namely offset, gain and linearization errors, can be compensated as long as timely calibration routines are performed in the measurement system. Nowadays, with the advent of smart sensors, the new capabilities associated with microprocessor or microcontroller...
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