The dynamic process of highly efficient holographic recording of two orthogonally circularly polarized plane light waves on the azo-dye-colored gelatin with powerful Weigert's effect is investigated. The investigation has shown that at some ratios of the intensities of the recording waves the self-recording phenomenon during the reconstruction process by the same actinic light (lambda=488.0 nm) is observed, and the diffractive efficiency for the probe light (lambda=632.8 nm) of an already fully recorded hologram increases again almost instantly after blocking one of the recording beams of low intensity. The maximum diffractive efficiency reaches 40%-45% in this case.
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http://dx.doi.org/10.1364/ao.46.002575 | DOI Listing |
The dynamic process of highly efficient holographic recording of two orthogonally circularly polarized plane light waves on the azo-dye-colored gelatin with powerful Weigert's effect is investigated. The investigation has shown that at some ratios of the intensities of the recording waves the self-recording phenomenon during the reconstruction process by the same actinic light (lambda=488.0 nm) is observed, and the diffractive efficiency for the probe light (lambda=632.
View Article and Find Full Text PDFNihon Jibiinkoka Gakkai Kaiho
May 1992
Department of Otolaryngology, Iwate Medical University, Morioka.
The tinnitus masking test, in which the minimum masking levels of tinnitus by various pure tones and band noises are measured and used to produce tinnitus masking curves, is one of the methods for evaluating the character of tinnitus. At present, the tinnitus masking test is usually performed using a pure tone audiometer. In this study, tinnitus masking curves were produced using a self-recording audiometer (Bekesy audiometer) in 22 cases of tinnitus, and the basic nature of the tinnitus masking curves from the self-recording audiometer was investigated and compared with those from a pure tone audiometer.
View Article and Find Full Text PDFThe provoking mechanism of peripheral vestibular disorder in the cervicovestibular syndrome is discussed on the basis of the results of perivascular sympathectomy of the vertebral artery. The peripheral type of this syndrome can be differentiated from the central type in that it shows fatigue due to positioning nystagmus and the reversion phenomenon in the self-recording cupulogram. 42 cases of the peripheral type could be completely cured of episodes of vertigo by the unilateral operation, but the other 6 cases required bilateral operations to prevent such episodes.
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