Patent ID: 11959883
Assignee: KABUSHIKI KAISHA TOSHIBA
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. A diagnostic method comprising:
emitting a first vibration sound to a target by using speakers arranged at equal angular intervals on a circumference of a circle;
measuring a vibration of the target generated in response to the first vibration sound, or a second vibration sound radiated from the target due the vibration, by using at least one measurement unit arranged on a central axis of the circle; and
diagnosing the target based on an output from the at least one measurement unit,
wherein emitting the first vibration sound uses Lp speakers as the speakers to emit a vibration sound in a Lobe mode as the first vibration sound, Lp≥2M+1 is satisfied where M (M≥1) is an order of the Lobe mode, and a phase difference depending on Lp and M is set between two speakers adjacent to each other on the circumference.