Abstract
Resonance measurements have the benefit that the system itself is a natural signal amplifier with a gain proportional to the quality factor (Q) of the resonator. However, even this small respite from Murphy’s law is not always enough to coax weak resonance signals out of a noisy background. In this talk I will discuss several aspects of improving signal to noise ratios in resonant ultrasound spectroscopy measurements using both hardware and software based solutions such as custom low‐noise preamplifiers, lock‐in amplifiers, dynamic averaging during data acquisition, and nonlinear fitting of noisy and overlapping (low‐Q) peaks to an analytical model. Some particular issues of signal transmission across high‐thermal gradients will also be discussed.
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