Pilot-frequency dual-pulse COTDR (Coherent Optical Time Domain Reflectometry) sensing device and method
A sensing device and double-pulse technology, applied in measuring devices, instruments, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problem of limiting the scope of application of COTDR technology, affecting the stability of COTDR sensing signal-to-noise ratio and applicable environmental range, phase Noise COTDR signal phase interference and other problems, achieve the effect of stable return optical signal intensity, eliminate phase change at no vibration, and improve robustness
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Embodiment 1
[0040] Example 1: A COTDR sensing device with different frequency and double pulses
[0041] Such as figure 1 As shown, light source 1 emits frequency f 0 The continuous laser light passes through the 1×2 coupler 2, and is divided into two paths of local reference light and signal light: the signal light passes through the frequency-shift pulse modulator 4 controlled by the modulation signal generating device 3, and the frequency of the modulated light is f 0 +f 1 and f 0 +f 2 , with a width of W 1 and W 2 , interval W 0 The different frequency double pulse, where f 1 , f 2 are the frequency shift frequencies of the two pulses respectively; the double pulses with different frequencies are amplified by the erbium-doped fiber amplifier 5, transmitted by the optical fiber circulator 6, and injected into the sensing fiber 7, and the double pulses with different frequencies are transmitted along the sensing fiber 7, and Backward Rayleigh scattering is generated sequentiall...
Embodiment 2
[0052] Example 2: A COTDR sensing method with different frequency and double pulses
[0053] Such as figure 1 As shown, the light source emits frequency f 0 The continuous laser light is divided into two paths of local reference light and signal light through a 1x2 coupler; the signal light is modulated into optical frequencies f 0 +f 1 and f 0 +f 2 , with a width of W 1 and W 2 , interval W 0 The different frequency double pulse, where f 1 , f 2 are the shift frequencies of the two pulses, respectively. Wherein, the modulation signal of the modulation signal generating device is as follows figure 2 The change shown, in each repetition period T, contains 2 pulse signals, each with a width of W 1 and W 2 , the pulse interval is W 0 . The different-frequency double pulses are amplified by the erbium-doped fiber amplifier and the circulator successively, and then injected into the sensing fiber. Demodulated phase information φ 1(t) , the light frequency is f 0 +...
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