| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Research Abstract |
We carried out studies to develop the optical wave microphone, which can directly detect sounds by a laser beam without any diaphragm. In the present research report, it is shown that (1) all sound frequencies from audio wave to low-frequency ultrasonic wave can be detected, (2) the sensitivity can be greatly improved by using a co-axial multi-reflection system or an optical resonance system, and (3) the separating measurement of sounds with different incidence angle and the hand control of receiving directivity can be realized by using an optical fiber bundle to detect the spatially-distributed signal light (or the diffracted light by sounds).
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