Liquid-Circular Angular Accelerometer: A Review

This article reviews the mainstream angular acceleration measurement techniques. Varieties of direct measurements, including rotational, solid mechanical inertial, fluid mechanical inertial, and microelectromechanical system angular accelerometer, are expanding in the practical applications of measurement and control systems. Recently researchers focus on microelectromechanical system and fluid-based sensors in light of increasing requirements for the measurement. In this review, we first investigated developments of angular acceleration measurements. Then we introduced one of the fluid-based sensors, a liquid-circular angular accelerometer, which is a novel angular sensor consisting of a porous transducer and an electrolyte solution chiefly. Eventually, we detailed recent works on this sensor's mechanism and the other aspects, e.g. significant properties of components and major research methodologies, and discussed its trade-off on performance with wide frequency, large dynamic range and high accuracy relatively, to show this sensor could bring advantages compared with other measurement methods.