鼓膜インピーダンス測定に関する研究
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概要
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The author studied on Troger's method for mesurement of the impedance of the human ear drum and checked it in detail experimentally as well as mathematically.The impedance the author obtained by Troger's method is found similar to those of Troger, Geffcken, Waetzmann & Keibs. and Metz, except that of Zwislocki. For example, the impedances are as follows; At 500 cps, 170 ohms by the author, 90 by Troger, 217 by Geffcken, 155 by Waetzmann & Keibs, 120 by Metz, on the other hand 647 by Zwislocki. At 1000 cps. 89 ohms by the author. 125 by Troger, 160 by Geffcken, 73 by Waetzmann & Keibs, 55 by Metz, on the other hand 310 by Zwislocki.The impedance is higher in a lower frequency range and lower in a higher frequency range.Finally the author measured the impedance of a rubber membrane by Troger's method and by another's method which is not avilable to the human ear but most exact only in measurement of acoustical impedance. It could be found from comparison of these two results that the impedance obtained by Troger's method as well as the other's are not correct. A more correct method for the measurement of the impedance of the human ear drum should be developed in future.
- 一般社団法人 日本耳鼻咽喉科学会の論文