Advances in Optical Technologies

Research Article

A New Method for Airborne Sound Detection Using Total Internal Reflection and Its Application to Microphone

Figure 11

Power spectra of the signal light (top) and the reference light (bottom).
547597.fig.0011a
(a) 𝑓 0 = 4 0 k H z
547597.fig.0011b
(b) 𝑓 0 = 1 4 . 5 k H z
547597.fig.0011c
(c) 𝑓 0 = 1 2 k H z