| 摘要 |
PURPOSE:To detect an ultrasonic vibration at a small loss by sticking a reflecting film to the opening surface being adjacent to each element of an ultrasonic transmitter array or of a groove formed by hollowing out each element, putting a minute spot of a continuous wave laser thereon and detecting the ultrasonic vibration on the surface of an examining body as a fluctuation of a reflected laser. CONSTITUTION:A laser light from an optical laser diode 1 is divided into two by a half mirror 2, and one of them is guided as a transmitting laser to a scanner 6. Subsequently, by a rotary mirror 7 in the scanner 6, the direction of the transmitting laser is varied by 90 degrees, and it is guided to a groove 9 being adjacent to an ultrasonic element array 8 which forms the curved surface being on the periphery by looking at from a reflecting point of the rotary mirror 7. In such a state, in accordance with the scanning transmission of the element array 8, the rotary mirror 7 is subjected to synchronized rotation. This synchronized rotation is executed by a fact that ultrasonic data 11 is rotated by a minute angle each by a signal from an ultrasonic pulse circuit 10. Subsequently, a reflected laser from a laser reflecting film attached to the surface of the examining body side of the groove 9 moves backward and is inputted to a detector 13. |
