Patent ID: 8478547

Claim:
A system, comprising: a turbine including a compressor having at least one row of a plurality of blades; a sensor for sensing a blade passing signal of at least one of the plurality of blades; an analog signal transmitter for transmitting an analog signal for the blade passing signal; a signal splitter for splitting the analog signal into at least two split analog signals; at least two analog-to-digital (AD) converters, each AD converter converting each split analog signal to at least two digital waveform samples; and a blade monitoring system that: calculates at least two interpolated threshold crossings, each interpolated threshold crossing calculated from at least two digital waveform samples from each AD converter, wherein the at least two digital waveform samples connect a digital waveform sample coordinates line and each interpolated threshold crossing is where the digital waveform sample coordinates line crosses a predetermined threshold level; and calculates an average threshold crossing (ATC) of the at least two interpolated threshold crossings.