The characteristics of the reconstructed images of a volume hologram are studied in terms of Kirchhoff diffraction integral when the photographic material undergoes a thickness change after exposure. The Bragg condition and the angular and wavelength sensitivity of the illuminated wave are calculated.
A new simple apparatus for registering eye movements was constructed using a photodiode called a light position sensor (PIN-SC/10, United Detector Technology). The first Purkinje image of a light source was focused on the photodiode put in front of the left eye. The photodiode produced two outputs that corresponded to the horizontal and vertical components of the eye movement respectively. The eye movements, therefore, were readily registered and analyzed. The present apparatus had a sensitivity of about 0.03 degrees of arc in visual angle and a corner frequency of about 1 KHz, and operated over a visual field of 15 degrees in diameter.
The practical range of application of the in-plane displacement measurement technique by the use of multiple aperture imaging, and a new technique of simultaneous representation of two components of the displacement in different colors are reported.