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Original Article

Vibration Measurement of the Human Tympanic Membrane-In Vivo

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Pages 37-42 | Received 12 Mar 1979, Published online: 08 Jul 2009
 

Abstract

The vibration patterns of the human eardrum in vivo have been recorded by time average electronic speckle pattern interferometry-ESPI. The necessary stability was achieved by shortening the exposure time of each TV frame. The amplitude-and phasedistribution was mapped across the drum by phase-modulation techniques which also could show the vibrations in slow motion. By photoelectric detection of the TV image intensity, amplitudes down to 2 nm could be measured. Preliminary results are presented.

Zusammenfassung

Die Schwingungen des lebenden Menschentrommelfells sind registriert worden, mittels Durchschnittszeit elektronischer Speckle-Interferometrie - ESPI. Die not-wendige Stabilität wurde bei Verkürzung der Exponierungszeit jedes Fernsehbildes erreicht. Die Amplituden und Phaseverteilung des Trommelfells wurden mittels der Phasemodellierungstechniken erfaβt, die auch die Schwingungen im Zeitlupentempo darstellen konnten. Bei photoelektrischer Aufdeckung der Intensität des Fernsehbildes konnten Amplituden bis zu 2 nm gemessen werden. Vorläufiger Erfolg wird präsentiert.

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