走査型超音波ホログラフィ
1971 年 40 巻 5 号 p. 504-509
詳細
1971 年 40 巻 5 号 p. 504-509
An experiment to construct the hologram of an object in water using ultrasonic waves (1 MHz) and to reconstruct the original images using laser light (6328 Å) is conducted. Scanning the detector mechanically, ultrasonic holograms are constructed by Gabor's coherent background method and an electronic reference method. As the directivity of the source is an important problem in ultrasonic holography, experimental study is conducted. From the reciprocity theorem in sound fields, the same hologram as is made by scanning the detector is obtained by scanning the source. This is the specific way of the scanning method. Further, it is proposed to apply ultrasonic holography to interferometry and basic experiments are made. From these experiments, it is made clear that ultrasonic holography is a promising method of non-destructive testing.
