Measuring device for brillouin optical sensing type continuous multipoint displacement meter

Abstract

The invention relates to a measuring device for a brillouin optical sensing type continuous multipoint displacement meter. The invention aims at providing the measuring device for the brillouin optical sensing type continuous multipoint displacement meter to simplify the whole structure, reduce construction difficulty and cost and accurately justify the occurrence location of an actual transformation. The technical schemes includes that the measuring device for the brillouin optical sensing type continuous multipoint displacement meter is characterized by comprising a brillouin optical sensing type continuous multipoint displacement meter which is solidified in a drill hole through grouting, a brillouin interrogator which is connected with the displacement meter through a transmission optical cable and a data analysis computer which is connected with the interrogator through signal lines. The measuring device for the brillouin optical sensing type continuous multipoint displacement meter is suitable for the safety monitoring fields of water conservancy,hydropower and geological engineering.

Description

technical field [0001] The invention relates to a detection device for deep displacement of rock and soil based on Brillouin distributed optical fiber sensing technology, especially a Brillouin optical sensing continuous multi-point displacement meter measurement device, which is mainly suitable for water conservancy and hydropower and The field of geological engineering safety monitoring. Background technique [0002] During the excavation of slopes, underground caverns and the construction of large-scale foundation projects, sensors such as bedrock displacement meters and multi-point displacement meters are generally used to monitor the deep displacement of rock and soil. For transmission rods of different lengths, the displacement of the anchorage end relative to the orifice at different depths is measured, and the deformation of each measuring point and the orifice is converted through the assumed deep fixed point. The sensors used are classified according to the sensin...

AI Technical Summary

Problems solved by technology

The current testing instruments and methods have four problems in use: First, limited by the number of sensors, usually only the displacement of 4 to 5 points can be measured at most, which is not enough to judge the exact location of the actual deformation; It needs a transmission rod several meters or even tens of meters long to transmit the axial deformation of the deep part to the orifice. Problems such as thermal expansion and contraction of the transmission rod itself, distortion, and stability of the pressure rod may cause distortion of the measured value; three. In the conversion of relative displacement to absolute displacement, the measured value of the deepest point should be used as the benchmark. Once this measuring point fails, other measuring points cannot be calculated. If there are many, the required drilling diameter will be larger, and the construction difficulty and cost will increase.

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