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A method for determining the signal-to-noise ratio of sensors by spectral analysis

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1 Author(s)
Breitenbach, A. ; Lehrstuhl fur Elektrische Messtech., Tech. Univ. Munchen, Germany

Often the dynamic performance of sensors has to be evaluated. For this, figures of merit such as total harmonic distortion (THD) and signal-to-noise ratio (SNR) are useful. Several methods for analysing analog sensor output after sinusoidal stimulation are compared. A method for determining the SNR of an analog sensor is proposed by which the sensor is stimulated sinusoidally, its output sampled, subjected to a FFT and the resulting spectrum analysed to obtain the sensor's SNR value. An experimental set-up for testing displacement sensors is also described. By adapting the outlined measurement method to different sensors the SNR is determined for a number of distance, velocity and acceleration sensors such as eddy current, differential transformer, strain gage and capacitive sensors and compared with the results of interferometric measurements on the displacement actuator

Published in:

Instrumentation and Measurement Technology Conference, 1997. IMTC/97. Proceedings. Sensing, Processing, Networking., IEEE  (Volume:1 )

Date of Conference:

19-21 May 1997