Analysis of a Remote Magneto-Optic Linear Displacement Sensor Using a Jones Matrix Approach

Accurate Measurements of the Rotational Velocities of Brushless Direct-Current Motors by Using an Ultrasensitive Magnetoimpedance Sensing System

“…Where R is the number of the rotation turns in one minute, N is the number of the positive peak signals or negative peak signals in a time-span (T). The rotational velocity (R) can be easily figured out by equation (2). For example, there are 30 positive wave crests from 0 s to 0.3 s in Figure 4d, so there are 50 circles in one second and 3000 circles in one minute, which agrees well with the rotation velocity measured by the Hall sensor outputting on the rotating velocity meter.…”

“…Over the past few decades, a series of sensors have been developed for measurements of rotational velocity including Magnetooptical sensors [1,2], Electrostatic sensors [3,4], Magnetoresistance sensors [5][6][7][8][9], etc. [10][11][12][13][14][15][16][17].…”

“…The rotational-velocity measurement results of the DC motor I below rated velocity (3000 r/min) with 2 cm space: (a) 1500 r/min (b) 2000 r/min (c) 2500 r/min (d) 3000 r/min. The rotational velocity (R) can be easily figured out by equation(2). For example, there are 30 positive wave crests from 0 s to 0.3 s in…”

Performance analysis of a flexible polyimide based device for displacement sensing

“…However, non-contact eddy current sensors have one problem, inhomogeneity (electrical run out) that affects their accuracy and applications [1]. Optical, as well as Michelsons interferometers, are one of the popular displacement measurement methods because of their high precision [2,3]. These sensors are very sensitive to environmental perturbations and suffer from deterioration of signal to noise ratio and disappearance of the desired signal and deviations in the optical path length.…”