Volkov P, Lukyanov A, Goryunov A, Semikov D, Vyazankin O. Low-Coherence Homodyne Interferometer for Sub-Megahertz Fiber Optic Sensor Readout.
SENSORS (BASEL, SWITZERLAND) 2024;
24:552. [PMID:
38257647 PMCID:
PMC10819612 DOI:
10.3390/s24020552]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 01/09/2024] [Accepted: 01/12/2024] [Indexed: 01/24/2024]
Abstract
This study proposes a method for interferometric fiber optic sensor readouts. The method utilizes the advantages of the active homodyne demodulation technique and low-coherence interferometry. The usage of the tandem low-coherence interferometer enables modulating the reference interferometer without any changes to the sensor. This achieves high sensitivity, high stability, and a wide frequency band. A sensitivity of up to 0.1 nm (RMS) in the frequency range of 5 kHz is demonstrated by detecting acoustic signals with a fiber Michelson interferometer as a sensor.
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