| 摘要 |
PURPOSE:To enhance the sensitivity at the time of detecting vibration of the mirror surface, in the ultrasonic probe for fetching a reflected wave of an ultrasonic wave radiated into a living body as vibration of the mirror surface by an interference of a laser light. CONSTITUTION:By a reflected wave from an examining body 7, the thin film mirror surface 12 vibrates. A laser emitted from a projector 8 passes through an incident hole 11 of the upper face mirror 10 and is reflected by the thin film mirror surface 12 and subjected to multiple reflection, and thereafter, goes out of an emitting hole 13 and reaches a photodetector 14. In the photodetector 14, vibration of the thin film mirror surface 12 is detected by a phase difference caused by an interference of the transmitted laser and the photodetected laser. Since a multiple reflection of the laser is executed in a groove 9, the phase difference increases and the sensitivity is enhanced. |
