![]() However, a much more traditional approach has been to use fullwave rectification, whereby a non-linear operator and lowpass filtering are employed. In a previous article, we discussed how differentiation could be used to find the peaks and troughs of sinewave, i.e. ECG biomedical compliance testing – channel compliance with IEC regulations needed for FDA testing typically uses a set of sinewaves at known amplitudes, to ensure that the channel amplitude error is within specification.Measuring harmonic amplitudes in power quality smart grids applications – in 50/60Hz power systems, certain harmonic amplitudes are of interest.Measuring gas concentration in infra-red gas sensors – the resulting sinusoid’s amplitude is used to provide an estimate of gas concentration.Calibrating CT (current transformers) sensors channels – a sinusoid of known amplitude is applied to channel input and the output amplitude is measured.An AC sinusoidal excitation overcomes the difficulty of dealing with instrumentation electronics DC offsets. ![]() Measuring material fatigue/strain with a loadcell – in vehicle and bridge/building applications measuring material fatigue and strain is essential for safety.Many IoT applications use a sinewave for estimating the amplitude of an entity of interest – some examples include: ![]()
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