Optical Fiber Photonic Crystal Hydrophone for Cellular Acoustic Sensing

Abstract

This paper describes the design, characterization, and testing of a compact hydrophone capable of measuring acoustic signals from cardiomyocytes. Our hydrophone consists of a nanofabricated photonic-crystal diaphragm externally-mounted to the facet of an optical fiber to form a pressure-sensitive Fabry-Pérot cavity. Our hydrophone can operate in small liquid volumes less than 5 mm deep and incorporates a microchannel to vent air during immersion. The venting channel is designed to optimize bandwidth and sensitivity. Modeling and experimental results in water show a bandwidth from 50 Hz to 18 kHz and a minimum detectable pressure of 3 µP a/ √Hz. We demonstrate the sensitivity to simulated bio-acoustic sources with nanometer-scale displacements.

A high-sensitivity EFPI acoustic sensor based on silicone rubber diaphragm

“…Using optical fiber to sense sound signal is an advanced measurement method. Compared to traditional capacitive or piezoelectric acoustic sensors, optical fiber acoustic sensor has unique advantages, such as passive, corrosion resistant, light weight, freedom from the interference of electromagnetic irradiation, and multiplexing capability [1][2][3][4] . A variety of fiber optic acoustic sensors have been demonstrated over the past decades, including Fiber Bragg grating (FBG) [5,6] ,…”

Realization of high performance PZN-PT single crystal based piezoelectric flexural mode hydrophone for underwater sensor applications

“…It is significantly used in wide range of applications for both military and civilian purposes like acoustic communication, detection, imaging, monitoring, surveillance and exploration etc, [3][4][5][6][7][8][9][10][11][12]. Depending on how the acoustic pressure is converted into electrical signal, hydrophones are categorized into piezoresistive, piezoelectric and optical systems [13][14][15]. Among them piezoelectric hydrophones are widely used for its versatility and optimal performance.…”

A high sensitivity fiber optic acoustic sensor based on incident-angle sensing: application to detect snoring signals

“…Compared with ordinary piezoelectric acoustic sensors, fiber optic acoustic sensors (FOAS) have the advantages of strong anti-electromagnetic interference ability, corrosion resistance, and high sensitivity, which make FOAS a unique advantage in the medical field. For example, the hydrophone can be used in the application of ultrasonic acupuncture tracking [1,2] , empty bubble dynamics [3] , and measuring myocardial cell acoustic signals [4] . In some specific occasions, such as MRI, FOAS also has an irreplaceable effect in detecting voice signals.…”