| 摘要 |
PURPOSE:To widen an observing area by placing opposingly an optical diffusion plate and a hologram recording photosensitive material on the circumferential surface of a cylindrical frame for surrounding a measuring area. CONSTITUTION:An observing device consists of a light source part (a), an optical element group (b), and a hologram recording part (c). The light source part (a) is constituted so that a pulse laser light source 1A and a continuous light emitting gas laser 1B emit a beam by a light source switching mechanism 1C. A measuring light optical system consists of a beam splitter 7 and reflectors 8, 9 and 10, and sends an incident beam to a diffusion plate 17. A reference light optical system consists of a beam splitter 6 and reflectors 13, 14 and 15, and irradiates a diffused light. The diffusion plate 17 and a band-like hologram recording photosensitive material 18 are placed opposingly on the half circumference of the side face of a cylindrical frame 16 for surrounding a measuring area F1. A picture recording device 21 for collecting a hologram reproduced image is attached to the back of the photosensitive material 18. |
