Stolárik Martin, Kepák Stanislav, Pinka Miroslav, Čubík Jakub, Nedoma Jan
Department of Geotechnics and Underground Engineering, Faculty of Civil Engineering, VSB-Technical University of Ostrava, 708 00 Ostrava, Czech Republic.
Department of Telecommunications, Faculty of Electrical Engineering and Computer Science, VSB-Technical University of Ostrava, 708 00 Ostrava, Czech Republic.
Sensors (Basel). 2022 Jul 26;22(15):5579. doi: 10.3390/s22155579.
Currently, all the technology used for seismic monitoring is based on sensors in the electrical domain. There are, however, other physical principles that may enable and fully replace existing devices in the future. This paper introduces one of these approaches, namely the field of fiber optics, which has great potential to be fully applied in the field of vibration measurement. The proposed solution uses a Michelson fiber-optic interferometer designed without polarization fading and with an operationally passive demodulation technique using three mutually phase-shifted optical outputs. Standard instrumentation commonly used in the field of seismic monitoring in geotechnical engineering was used as a reference. Comparative measurements were carried out during the implementation of gravel piles, which represents a significant source of vibration. For the correlation of the data obtained, the linear dependence previously verified in laboratory measurements was used. The presented results show that the correlation is also highly favorable (correlation coefficient in excess of 0.9) from the values measured in situ, with an average deviation for the oscillation velocity amplitude of the optical sensor not exceeding 0.0052.
目前，所有用于地震监测的技术都基于电域中的传感器。然而，还有其他物理原理，未来可能会启用并完全取代现有设备。本文介绍了其中一种方法，即光纤领域，它在振动测量领域有很大的全面应用潜力。所提出的解决方案使用了一种迈克尔逊光纤干涉仪，该干涉仪设计为无偏振衰落，并采用一种使用三个相互相位偏移的光输出的操作上无源的解调技术。岩土工程地震监测领域常用的标准仪器被用作参考。在实施碎石桩期间进行了对比测量，碎石桩是一个重要的振动源。为了对获得的数据进行相关性分析，使用了先前在实验室测量中验证的线性相关性。给出的结果表明，从现场测量值来看，相关性也非常良好（相关系数超过0.9），光学传感器振荡速度幅值的平均偏差不超过0.0052。
