Abstract
A quadrature fiber optic Fabry–Perot cavity microphone based on a differential cross multiplication algorithm consists of a pair of fibers and a membrane. It has many advantages such as high sensitivity, a simple structure, and resistance to electromagnetic interference. However, there are no systematic studies on its key performance, for example, its frequency response and dynamic range. In this paper, a comprehensive study of these two key parameters is carried out using simulation analysis and experimental verification. The upper limit of the frequency response range and the upper limit of the dynamic range influence each other, and they are both affected by the data sampling rate. At a certain data sampling rate, the higher the upper limit of the frequency response range is the lower the upper limit of the dynamic range. The quantitative relationship between them is revealed. In addition, these two key parameters also are affected by the quadrature phase deviation. The quadrature phase deviation should not exceed 0.25π under the condition that the demodulated signal intensity is not attenuated by more than 3 dB. Subsequently, a short-step quadrature Fabry–Perot cavity method is proposed, which can suppress the quadrature phase deviation of the quadrature fiber optic Fabry–Perot cavity microphone based on the differential cross multiplication algorithm.
Highlights
As a new type of microphone, the fiber optic microphone (FOM) has the advantages of high sensitivity, low propagation loss, and resistance to electromagnetic interference compared with the existing electric, piezoelectric, capacitive, and other traditional acoustic microphones [1,2,3,4]
From the the experimental experimental results, ititcan that as the sound signal intensity increased, relative intensity tensity the signal demodulated by wave the wave quadrature fiber opticincreased, F–P the cavity microphone results,of canbe beseen seen that as the sound signal intensity the relative inof the signal demodulated by the quadrature fiber optic F–P cavity microphone decayed
To investigate the suppression of the quadrature phase deviation caused by the investigate drift, the suppression of the quadrature deviation laserTowavelength three quadrature fiber optic Fabry–Perot cavity microphone (Q–FFPM)–differential cross multiplication algorithm (DCM)
Summary
As a new type of microphone, the fiber optic microphone (FOM) has the advantages of high sensitivity, low propagation loss, and resistance to electromagnetic interference compared with the existing electric, piezoelectric, capacitive, and other traditional acoustic microphones [1,2,3,4]. It have a wide range of applications, especially irreplaceable applications in acoustic source detection under a strong electromagnetic environment [5]. The method solves the issue of reduced sensitivity due to changes in the initial cavity length of the F–P cavity
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