Real-time high-precision delay sensing device and method based on optical fiber Doppler interference
A technology of Doppler interference and sensing devices, which is applied in the field of real-time high-precision time-delay sensing devices, can solve the problem of inability to realize direct online sensing of delay line delay, inability to provide real-time online measurement, optical fiber Doppler displacement Interferometers cannot be used at the same time to achieve the effect of online measurement, high fringe contrast, and guaranteed measurement accuracy
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[0038] Embodiment: real-time high-precision delay sensing device based on optical fiber Doppler interference, such as figure 1 As shown, it includes fiber-coupled laser chip 1, fiber splitter 4, fiber polarization combiner 6, three-port fiber circulator 8, target fiber delay line 9, fiber polarization splitter 10, fiber combiner 12, fiber Coupling photodetector 13, time-delay signal real-time processing board 15, multiple single-axis transmission polarization maintaining fiber 2, multiple dual-axis transmission polarization maintaining fiber 7. The fiber-coupled laser chip 1, the fiber splitter 4, the fiber combiner 12, and the fiber-coupled photodetector 13 are sequentially connected along the signal output direction by a uniaxial transmission polarization-maintaining fiber 2, and the output end of the fiber-coupled photodetector 13 It is connected to the input terminal of the delayed signal real-time processing board 15 in communication. The two input ends of the fiber polar...
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