T H Wilmshurst and N A Halliwell 1993 Meas. Sci. Technol. 4 479 doi:10.1088/0957-0233/4/4/008
T H Wilmshurst and N A Halliwell
Show affiliationsWhen a rotating scattering disc is used to frequency-shift the reference beam of a laser vibrometer, the noise floor is determined by speckle noise. The speckle noise is cancelled by recording it in the absence of target vibration and then subtracting the recorded signal Vr from that obtained when measuring the vibration. Vr is the average for 256 disc rotations, to reduce the aperiodic amplifier noise that is also recorded. Reduction factors obtained were waveform, -12 dB and spectrum, 0-12.8 kHz, 16 Hz resolution, -14 dB; 0-200 Hz, 0.25 Hz resolution, -30 dB.
42.62.Eh Metrological applications; optical frequency synthesizers for precision spectroscopy
46.80.+j Measurement methods and techniques in continuum mechanics of solids
Instrumentation and measurement
Issue 4 (April 1993)
T H Wilmshurst and N A Halliwell 1993 Meas. Sci. Technol. 4 479
Matjaž Perc 2005 New J. Phys. 7 252
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