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We propose an optoacoustic airborne ultrasonic sensor consisting of a 633-nm He-Ne laser, an Si PIN photodetector, and a sensor head. The device has a sensitivity of 92.7 dB SPL (Sound Pressure Level) for acoustic signal inputs of single 40-kHz pulses, and it exhibits wideband receiving properties because of excluding mechanical moving elements such as diaphragms or voice coils from the sensor. The...
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