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首页> 外文会议>Distributed and Multiplexed Fiber Optic Sensors II >Spread-spectrum technique for passive multiplexing of reflective frequency-out fiber optic sensors exhibiting identical characteristics
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Spread-spectrum technique for passive multiplexing of reflective frequency-out fiber optic sensors exhibiting identical characteristics

机译：展频技术，用于无源复用反射式光纤传感器，具有相同的特性

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Abstract: A spread spectrum multiplexing (SSM) system for an array of reflective, frequency-out fiber optic sensors of identical characteristics has been developed. This system allows accessing of a large number of sensors with high sampling frequency of up to a few MHz and simultaneously permits a considerable improvement of the system optical power budget over single pulse time-division multiplexing methods. An experimental SSM system has been assembled and tested and the experiments have successfully demonstrated the passive multiplexing of eight reflective frequency-out fiber optic sensors with a vibration frequency of 17.36 kHz. Crosstalk of approximately $MIN@22 dB has been observed, which is in agreement with theoretical results expected from consideration of the code length of the pseudorandom bit sequence used and the sensor number in the network. Additionally, a novel digital PRBS exhibiting zero auto-correlation at non-zero delays has been modelled and experimentally tested, yielding promising results for sensor multiplexing. !8
机译：摘要：已开发出一种具有相同特性的反射式，频出光纤传感器阵列的扩频复用（SSM）系统。该系统允许访问高达几MHz的高采样频率的大量传感器，并且同时允许相对于单脉冲时分多路复用方法显着改善系统光功率预算。一个实验性的SSM系统已被组装和测试，并且实验成功地证明了振动频率为17.36 kHz的八个反射式频率输出光纤传感器的无源复用。已经观察到大约$ MIN @ 22 dB的串扰，这与考虑到使用的伪随机比特序列的代码长度和网络中的传感器数量所期望的理论结果相符。此外，新型的数字PRBS在非零延迟时表现出零自相关的特性已经过建模和实验测试，为传感器复用提供了有希望的结果。 ！8

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