A Flexible Digital Signal Processing Platform for Very High Signal-to-Noise Ratio Enhancement of Weak Eddy Current and Ultrasonic Signals Routinely Encountered in NDE

2006 ◽  
Author(s):  
P. Gaydecki
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Eddy Current ◽  
Signal To Noise Ratio ◽  
Digital Signal ◽  
High Signal ◽  
Signal To Noise ◽  
Ultrasonic Signals ◽  
Processing Platform ◽  
Very High

Signal-to-noise ratio enhancement in frequency-modulation spectrometers by digital signal processing

1994 ◽  
Vol 19 (2) ◽  
pp. 144 ◽  
Author(s):  
Haris Riris ◽  
Clinton B. Carlisle ◽  
Russell E. Warren ◽  
David E. Cooper
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Frequency Modulation ◽  
Signal To Noise Ratio ◽  
Digital Signal ◽  
Signal To Noise ◽  
Noise Ratio

scholarly journals Three-Axis Inductive Displacement Sensor Using Phase-Sensitive Digital Signal Processing for Industrial Magnetic Bearing Applications

Actuators ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 115
Author(s):  
Teemu Sillanpää ◽  
Alexander Smirnov ◽  
Pekko Jaatinen ◽  
Jouni Vuojolainen ◽  
Niko Nevaranta ◽  
...  
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Eddy Current ◽  
High Speed ◽  
Digital Signal ◽  
Magnetic Bearing ◽  
Air Gap ◽  
Sensor Design ◽  
Quadrature Demodulation ◽  
Displacement Sensors

Non-contact rotor position sensors are an essential part of control systems in magnetically suspended high-speed drives. In typical active magnetic bearing (AMB) levitated high-speed machine applications, the displacement of the rotor in the mechanical air gap is measured with commercially available eddy current-based displacement sensors. The aim of this paper is to propose a robust and compact three-dimensional position sensor that can measure the rotor displacement of an AMB system in both the radial and axial directions. The paper presents a sensor design utilizing only a single unified sensor stator and a single shared rotor mounted target piece surface to achieve the measurement of all three measurement axes. The sensor uses an inductive measuring principle to sense the air gap between the sensor stator and rotor piece, which makes it robust to surface variations of the sensing target. Combined with the sensor design, a state of the art fully digital signal processing chain utilizing synchronous in-phase and quadrature demodulation is presented. The feasibility of the proposed sensor design is verified in a closed-loop control application utilizing a 350-kW, 15,000-r/min high-speed industrial induction machine with magnetic bearing suspension. The inductive sensor provides an alternative solution to commercial eddy current displacement sensors. It meets the application requirements and has a robust construction utilizing conventional electrical steel lamination stacks and copper winding.

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