Distributed optical fiber three-component earthquake ground motion measuring device and measuring method

Abstract

The invention discloses a distributed optical fiber three-component earthquake ground motion measuring device. The device comprises a DAS (Distributed Acoustic Sensor) modem connected with a computer;the device further comprises optical fiber measuring units arranged at various measuring points; the optical fiber measuring units corresponding to various measuring points are connected in series and then are connected with the DAS modem through a head-end optical fiber connecting section; and each optical fiber measuring unit comprises a south component optical fiber winding section, an east component optical fiber winding section and an upper component optical fiber winding section which are connected with each other in series. The invention further discloses a distributed optical fiber three-component earthquake ground motion measuring method. According to the distributed optical fiber three-component earthquake ground motion measuring device provided by the invention, the calculationof earthquake ground motion signals is real time and accurate, and the high spatial sampling characteristic of a distributed fiber technology is relied on to obtain the spatially dense three-component earthquake ground motion signal acquisition capability, which is very beneficial to the fine imaging analysis of an underground structure. The observation speed is fast, a large number of measuringpoints can be provided, and signal data with high spatial density and high time density can be obtained.

Description

technical field [0001] The invention belongs to the field of vibration measurement, and more specifically relates to a distributed optical fiber three-component ground motion measurement device, and also relates to a distributed optical fiber three-component ground motion measurement method, which is suitable for underground projects such as subway tunnels and ground projects such as urban roads Vibration observation. Background technique [0002] Vibration signals received on the surface of the earth can bring useful information about the medium inside the earth. The ground motion signal can be used in engineering to calculate the three-dimensional estimation model of the underground structure. The accuracy of the geological model is related to the quality and spatial location of the vibration signal. To obtain imaging of fine structures, a vibration signal acquisition network with high spatial density is required. [0003] The measurement of ground motion generally adop...

AI Technical Summary

Problems solved by technology

Due to the high price of a single sensor, in many occasions that require high spatial density measurement and real-time analysis, such as long-term and small-scale engineering monitoring such as traffic tunnels and mine roadways, it is difficult to form dense arrays for long-term real-time monitoring

Images