Multi-parameter distributed optical fiber signal demodulator
A distributed optical fiber and signal demodulation technology, applied in the field of optical signal demodulation, can solve problems such as measurement errors, and achieve the effects of reducing interference, reducing residual stress, and solving measurement errors
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Embodiment 1
[0031] The embodiment is basically as attached figure 1 shown, including:
[0032] The preprocessing unit is used to process the sensing area of the multi-parameter distributed optical fiber by means of cyclic heating and cooling according to the preset temperature range;
[0033] The acquisition unit is used to acquire Stokes signals and anti-Stokes signals of multi-parameter distributed optical fibers;
[0034] a conversion unit, configured to convert the Stokes signal into a first current signal, and convert the anti-Stokes signal into a second current signal;
[0035] The debugging unit is used to debug the first current signal and the second current signal, so that the coincidence degree of the waveform of the first current signal and the waveform of the second current signal within a preset time interval reaches a preset coincidence threshold;
[0036] The calculation unit is configured to calculate the temperature value according to the luminous flux of the first cu...
Embodiment 2
[0045] The only difference from Embodiment 1 is that the preprocessing unit is also used to eliminate the external stress on the multi-parameter distributed optical fiber by means of encapsulation. In this embodiment, firstly, the first capillary, the second capillary and the sealant are prepared; then, the multi-parameter distributed optical fiber is inserted into the first capillary, and the sealant is coated on the outer wall of the first capillary. The sealant is injected into the second capillary, and the first capillary is penetrated into the second capillary; finally, the first capillary is drawn out, and prestress is applied to both ends of the multi-parameter distributed optical fiber until the sealant is cured.
Embodiment 3
[0047] The only difference from Embodiment 2 is that in this embodiment, the optical fiber 5 is used in winter in Northeast China, the daily temperature difference between day and night can be above 20-30°C, and the temperature change rate can reach 4-6°C / h; a part of the optical fiber 5 One is buried in the soil and the other is exposed to the air. Soil temperature will show seasonal fluctuations and diurnal changes with the change of air temperature near the surface; at the same time, due to the influence of periodic diurnal and annual changes in solar radiation, soil temperature will also change accordingly, making the annual change of soil temperature show It is a sinusoidal function, and the variation range of temperature decreases with the increase of soil depth. At a certain depth, the amplitude can be considered to be approximately zero. In addition, due to the different heat transfer coefficients of soil and air, the temperature of the soil is usually higher than that...
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