A novel opto-electromagnetic actuator coupled to the tympanic membrane
| Autor: | Jyh-Horng Chen, Tien-Chen Liu, Chih-Hua Shih, Jen-Fang Yu, Yuan-Fang Chou, Chia-Fone Lee |
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| Rok vydání: | 2008 |
| Předmět: |
Tympanic Membrane
Materials science Acoustics Transducers Biomedical Engineering Biophysics Vibration Displacement (vector) law.invention Magnetics Optics law Physical Stimulation Humans Orthopedics and Sports Medicine Man-Machine Systems Diode Occlusion effect business.industry Rehabilitation Optical Devices Equipment Design Photodiode Equipment Failure Analysis Transducer Acoustic Stimulation Electronics business Actuator Laser Doppler vibrometer |
| Zdroj: | Journal of Biomechanics. 41:3515-3518 |
| ISSN: | 0021-9290 |
| DOI: | 10.1016/j.jbiomech.2008.09.015 |
| Popis: | A new type of electromagnetic vibration transducer designed to be placed onto the tympanic membrane was developed. The actuator consisted of two photodiodes, two permanent magnets, an aluminum ring, two opposing wound coils, a latex membrane and a Provil Novo™ membrane. An optic probe was designed to allow sound and light signals to enter the ear canal, thereby preventing the acoustic occlusion effect of traditional ear molds. Two light-emitting diodes were used for carrying the input signals. The corresponding photodiodes were used for receiving the light signals and generating currents in the actuator. The opto-electromagnetic vibration actuator was fabricated and tested using a Laser Doppler vibrometer. The actuator showed displacements of vibration between 30 and 1 nm from 300 to 6500 Hz and reduced in amplitude at higher frequencies. The average gain of the actuator with 140 μA on the umbo displacement was about 20 dB relative to 87 dBA at the distance of 6 cm from the tympanic membrane and 0 μA in actuator. |
| Databáze: | OpenAIRE |
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