Pressure measuring device and method based on quadrature phase rapid demodulation and intensity compensation
An intensity compensation and quadrature phase technology, which is applied in the field of optical non-contact pressure real-time measurement devices, can solve the problems of the influence of signal strength, the influence of demodulation cannot be eliminated, and it is difficult to achieve fast demodulation, and the effect of reducing influence can be achieved.
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[0022] The wide-spectrum light source 1 is an SLED light source or an ASE light source with a center wavelength of 1550 nm and a spectral width of 70-80 nm. Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. The descriptions about the implementations are only exemplary, and should not be construed as limiting the present invention.
[0023] Such as figure 1 Shown is a schematic diagram of a real-time pressure measurement device based on quadrature phase fast demodulation and intensity compensation. The device includes: wide-spectrum (ASE or SLED) light source 1, optical fiber circulator 2, F-P pressure sensor 3, optical fiber 1×3 coupler 4, low coherence interferometer 5, intensity compensator 6, data acquisition card 7. Signal processing unit 8. Optical fiber collimator, polarizer, birefringent crystal block, analyzer, photodetector. The low-coherence interferometer 5 specifically includes two optic...
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