Turbulent-nonturbulent interface detector

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Abstract
An analog circuit is presented for the detection in real time of the turbulent‐nonturbulent interface at the free stream edge of turbulent shear flows. The output of the circuit is a square wave whose value is unity when the detector probe is in turbulent flow, and is zero when in nonturbulent flow. The effectiveness of several detection schemes is evaluated. A method for calibrating the detector circuit is given by using a ``synthetic,'' intermittently turbulent simulated signal of known intermittency properties. A circuit for generating the simulated signal is also presented.