Improving the line-spectrum detection capability of a single hydrophone is great significance for passive small underwater platforms. In this paper, we propose single-hydrophone cross-power spectrum (SHCS) method based on time-domain coherence. This uses coherence line and non-coherence continuous noise to obtain coherent gain improve signal-to-noise ratio (SNR) spectrum. The effects input SNR,...

This paper describes the design, characterization, and testing of a compact hydrophone capable measuring acoustic signals from cardiomyocytes. Our consists nanofabricated photonic-crystal diaphragm externally-mounted to facet an optical fiber form pressure-sensitive Fabry-Pérot cavity. can operate in small liquid volumes less than 5 mm deep incorporates microchannel vent air during immersion. T...

Abstract To better understand spawning vocalizations of Norwegian coastal cod (Gadus morhua), a prototype eight-element coherent hydrophone array was deployed in stationary vertical and towed horizontal modes to monitor sounds during an experiment spring 2019. Depth distribution aggregations monitored concurrently with ultrasonic echosounder. Cod recorded on the are analysed provide time–freque...