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A self-mixing laser-diode interferometer for measuring basilar membrane vibrations without opening the cochlea

journal contribution
posted on 2023-06-08, 00:15 authored by Andrei N Lukashkin, Mikhail E Bashtanov, Ian J Russell
A laser-diode forms the basis of a displacement sensitive homodyne interferometer suitable for measurements from poorly reflective surfaces. The compact and cost-effective interferometer utilizes the self-mixing effect when laser light reflected from a moving target re-enters the laser cavity and causes phase dependent changes of the lasing intensity. A piezo positioner was used to displace the interferometer with known frequency and amplitude as a basis for real-time calibration of the interferometer's sensitivity. The signal-processing algorithm is described that allows measurements in presence of high amplitude noise leading to variation of the interferometer's operating point. Measurements of sound-induced basilar membrane displacements were made in the intact cochleae of rodents by focusing the laser beam of the interferometer through the transparent round window membrane. The interferometer provides a viable means for making subnanometre mechanical measurements from structures in the inner ears of small mammals, where opening of the cochlea is not practicable.

History

Publication status

  • Published

Journal

Journal of Neuroscience Methods

ISSN

0165-0270

Issue

2

Volume

148

Page range

122-129

Pages

8.0

Department affiliated with

  • Biology and Environmental Science Publications

Notes

Principal author

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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