A comparative study of local sensors of power ultrasound effects: electrochemical, thermoelectrical and chemical probes

In order to propose standard methods for the local measurement of the effects of power ultrasound inside a reactor, we compare three methods: a chemical dosimeter (Weissler reaction), a thermal sensor (embedded thermocouple) and an electrochemical probe (developed in our laboratory). The same emission device, i.e. the resonant tube (Sonitube-Sodeva), was used for all these methods. Similar trends were observed using various measurements: ultrasound effects vary significantly along the tube axis (due to standing waves in the resonant tubular emitter), but only slightly from the tube axis to the wall. More reliable and reproducible results were obtained with the thermal and electrochemical probes than with the chemical dosimeter.