Ultrasonic oscillator

A method executed by an ultrasonic oscillator comprising:

• a plurality of transducers that oscillates and/or senses the ultrasonic waves;
• a retention portion that retains the plurality of transducers on a deformable concave portion forming a concave thereof opposing the heating target, so as to retain the plurality of transducers movable in conformity with the concave portion deforming in a state where the plurality of transducers is arranged along the concave;
• and
• a controller that controls the transducers so as to oscillate the ultrasonic waves, the method comprises:
• receiving sensing signals output from the transducers which sensed the ultrasonic waves oscillated from any of the plurality of transducers,
• specifying a sensing signal related to a direct wave included in the received sensing signals,
• calculating the distance between the oscillation side transducer and the sensing side transducer based on time from oscillation to sensing of the direct wave,
• calculating a visual angle between a center axis of oscillation and the sensing side transducer viewed from the oscillation side transducer, based on the sensing signal related to the direct wave, and
• correcting position information indicating a relative positional relationship between the plurality of transducers by using the distance and the visual angle.

A computer-readable non-transitory medium on which is recorded a program executed by a computer of an ultrasonic oscillator comprising:

• a plurality of transducers that oscillates and/or senses the ultrasonic waves;
• and a retention portion that retains the plurality of transducers on a deformable concave portion forming a concave thereof opposing the heating target, so as to retain the plurality of transducers movable in conformity with the concave portion deforming in a state where the plurality of transducers is arranged along the concave, wherein the computer controls the transducers so as to oscillate the ultrasonic waves, the program causes the computer to execute:
• receiving sensing signals output from the transducers which sensed the ultrasonic waves oscillated from any of the plurality of transducers,
• specifying a sensing signal related to a direct wave included in the received sensing signals,
• calculating the distance between the oscillation side transducer and the sensing side transducer based on time from oscillation to sensing of the direct wave,
• calculating a visual angle between a center axis of oscillation and the sensing side transducer viewed from the oscillation side transducer, based on the sensing signal related to the direct wave, and
• correcting position information indicating a relative positional relationship between the plurality of transducers by using the distance and the visual angle.