Ultrasonic transducer control method and system

Details Ultrasonic transducer control method and system Ultrasonic transducer control method and system

2006-07-24

2009-06-30

Nguyen, Vincent Q (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C310S316010

Reexamination Certificate

active

07554343

ABSTRACT:
The present invention relates to methods for velocity control of transducers that can compensate both for age related changes as well as the more immediate changes that occur during operation. In one aspect of the invention, the non-motional reactive current is measured at two predetermined frequencies, one below (Ilf) and one above the resonance frequency (Ihf). A correction factor is calculated from these measured currents is used to maintain a specified value of end effector velocity or displacement. In another aspect of the invention, methods are provided for the detection of secondary resonances that could be indicative of end effector fault conditions. In another aspect of the invention, velocity control is achieved.

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PCT International Search Report, PCT/US06/28750, Feb. 22, 2007.

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