Title :
Measurement of frequency response functions in the presence of correlated input/output errors
Author :
Pintelon, R. ; Schoukens, J.
Author_Institution :
Dept. ELEC, Vrije Univ., Brussels, Belgium
Abstract :
The frequency response function (FRF) of a system is often measured by taking the ratio of the output to the input Fourier coefficients of the steady state response of the system to a periodic excitation. Generator noise, common disturbances picked up by the acquisition channels of the measurement device, and an external feedback loop, cause a correlation between the input/output errors of such an FRF measurement. This paper quantifies the bias error and the variance of the FRF measurement due to correlated input/output errors
Keywords :
Fourier analysis; Gaussian noise; correlation methods; frequency response; measurement errors; spectral analysis; transfer functions; Fourier coefficients; acquisition channel disturbances; bias error; closed loop; confidence intervals; correlated I/O errors; external feedback loop; frequency response function; generator noise; measurement variance; open loop; periodic excitation; steady state response; Arithmetic; Discrete Fourier transforms; Error correction; Feedback loop; Frequency measurement; Frequency response; Frequency synchronization; Noise generators; Noise measurement; Steady-state;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2001. IMTC 2001. Proceedings of the 18th IEEE
Conference_Location :
Budapest
Print_ISBN :
0-7803-6646-8
DOI :
10.1109/IMTC.2001.928778
