Wideband fiber-optic acoustic sensor

Wideband fiber-optic acoustic sensor

Funkční vzorek

The functional sample of the wideband fiber-optic acoustic sensor is a complete measurement system designed for contactless acoustic field sensing in industrial and harsh environments. The sensor operates on the principle of a Fabry–Perot interferometer formed by a single-mode optical fiber and a carbon-graphene membrane, which transduces incident acoustic waves into cavity length modulation. The acoustic signal is interrogated optically using a dual-wavelength scheme, enabling differential detection with high linearity, enhanced signal-to-noise ratio, and inherent suppression of DC offsets. The sensing head is fully passive and contains no electrically powered components, providing immunity to electromagnetic interference and allowing signal transmission over long optical fibers to a remotely located signal processing unit. The measurement chain includes optical signal generation and conversion, analog signal conditioning, and an industrial-grade control and acquisition system implementing closed-loop stabilization of the interferometer operating point. This feedback control compensates for temperature-induced drift, mechanical stress, and optical power fluctuations, ensuring stable sensitivity during long-term operation. The functional sample supports fully automated sensor setup, calibration, and operation through dedicated software and enables wideband acoustic measurements up to several hundred kilohertz. Owing to its modular architecture, the measurement system is applicable to a broad class of membrane-based Fabry–Perot fiber-optic microphones and is suitable for advanced industrial diagnostics, fault detection, and high-frequency acoustic emission monitoring.

The functional sample of the wideband fiber-optic acoustic sensor is a complete measurement system designed for contactless acoustic field sensing in industrial and harsh environments. The sensor operates on the principle of a Fabry–Perot interferometer formed by a single-mode optical fiber and a carbon-graphene membrane, which transduces incident acoustic waves into cavity length modulation. The acoustic signal is interrogated optically using a dual-wavelength scheme, enabling differential detection with high linearity, enhanced signal-to-noise ratio, and inherent suppression of DC offsets. The sensing head is fully passive and contains no electrically powered components, providing immunity to electromagnetic interference and allowing signal transmission over long optical fibers to a remotely located signal processing unit. The measurement chain includes optical signal generation and conversion, analog signal conditioning, and an industrial-grade control and acquisition system implementing closed-loop stabilization of the interferometer operating point. This feedback control compensates for temperature-induced drift, mechanical stress, and optical power fluctuations, ensuring stable sensitivity during long-term operation. The functional sample supports fully automated sensor setup, calibration, and operation through dedicated software and enables wideband acoustic measurements up to several hundred kilohertz. Owing to its modular architecture, the measurement system is applicable to a broad class of membrane-based Fabry–Perot fiber-optic microphones and is suitable for advanced industrial diagnostics, fault detection, and high-frequency acoustic emission monitoring.

fiber-optic microphone, Fabry–Perot interferometer, wideband acoustic sensing, industrial diagnostics, dual-wavelength detection, graphene membrane, ultrasonic measurement

fiber-optic microphone, Fabry–Perot interferometer, wideband acoustic sensing, industrial diagnostics, dual-wavelength detection, graphene membrane, ultrasonic measurement

Výsledek je využíván vlastníkem

https://camat.ceitec.cz/vysledky/fom-sensor/