Abstract
In the process of measuring the radiated noise of underwater structure, using optical fiber hydrophone array is the main means of information acquisition. Due to the complexity of the measurement environment, when the wavelength of the light source and the array deformation in the optical fiber measurement system are changed, the power fluctuation of the input light and the demodulation failure of the system will be caused, which will affect the measurement effect of the radiated noise. For this reason, an adaptive control system for the optical source and the demodulator is designed, which can ensure the stability of the laser source and the digital demodulation system. The experimental data show that the adaptive control system designed in this paper can realize signal stable modulation and signal synchronous processing, which provides a more suitable scheme for accurate measurement of underwater equipment radiated noise.
Highlights
Optical fiber hydrophone has the advantages of high sensitivity, good integration, strong anti-electromagnetic interference and anti-signal crosstalk
In the measurement of radiated noise of underwater equipment, optical fiber hydrophone array is widely used as noise measurement sensor, and optical fiber is used as transmission channel for signal transmission
Photoelectric signal conversion is mainly realized by photoelectric conversion module, but when the input light intensity is too large, the module will produce saturation phenomenon, and the correct signal can’t be obtained by collecting and processing at the back end; when the input light intensity is too weak, the self-noise generated by demodulation will be very high due to low signal-to-noise ratio [2]
Summary
Optical fiber hydrophone has the advantages of high sensitivity, good integration, strong anti-electromagnetic interference and anti-signal crosstalk. In the measurement of radiated noise of underwater equipment, optical fiber hydrophone array is widely used as noise measurement sensor, and optical fiber is used as transmission channel for signal transmission. The anti-shock ability of large-scale array acquisition and regulation system is limited. It can only process signals with small amplitude change, and the demodulation system will be invalid if the signal is too strong or weak. In order to adapt to the change of the input optical power, the photoelectric preamplifier adaptive gain adjustment system is introduced into the acquisition and demodulation system to ensure the stability of the output signal amplitude, improving the accuracy and effectiveness of the optical fiber hydrophone array for underwater equipment radiation noise measurement
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