Figure 5
From: Air-coupled ultrasound detection using capillary-based optical ring resonators
Temporal response of different ultrasound detectors to an 800 kHz air-coupled ultrasound transducer (Japan Probe 0.9K14x20N-RX). Transmit ultrasound burst of 100 cycles was generated. All data were averaged 512 times. Response data in (c,d and e) are post-filtered with a bandpass filter with f 0 = 800 kHz and Δf = 200 kHz. Inset shows sinusoidal temporal signals for each detector. (a) Driving voltage input to the 800 kHz ultrasound transmitting transducer. Sinusoidal burst output with center frequency of 800 kHz was sent to the transmitter. (b) Detected transmission signal from the ring resonator. (c) Post-filtered response of ring resonator. (d) Post-filtered signal from the 800 kHz receiver. (e) Post-filtered signal from the microphone.
