ABSTRACT
Facilities for measuring acoustic parameters in solid-state loads are virtually identical to those employed for concerned measurements in ultrasonic stacks. During direct measurements, a probe is brought into a contact with a vibratory system. Besides, it is difficult to experimentally obtain necessary corrections for energy loss in vibratory system and measuring cell tubings. The circle diagram of a loaded transducer always lies inside the circle diagram of unloaded transducer, since energy loss in the former case is always greater. Such a construction enables the accommodation of the transformer on a current-carrying wire between the oscillator and transducer, which will prevent the flowing of current through the wattmeter and thus will greatly simplify its design. By varying the frequency of exciting oscillator, its output voltage amplitude can be made such that the vibration velocity amplitude at the radiating surface of the transducer remains constant.
