1. Overview

Geological deformation analysisceremonyIt is a new type of non-contact two-dimensional displacement monitoring sensor based on machine visionTechnology, using artificial intelligence dedicated embedded system platform, high-performance image sensors, professional grade photography lenses, embedded industry advanced image measurement algorithms, local calculation, and real-time output of two-dimensional displacement data through multiple communication interfaces. It has high measurement accuracy, adaptive distance measurement, large measurement range, and multiple targets per machine; Features such as small size, high integration, and easy installation and construction.

image 1 Visual displacement measuring instrument image 2 targetmark

Target or feature point(Installed in key areas of the tested structure)By using the telephoto optical system of a digital image displacement sensor to image on the photosensitive surface of the image sensor (digitizing the three-dimensional space image in reality into a virtual two-dimensional plane image), the object points in objective reality are matched one-to-one with the image points in the digital image）Through image processing recognition and high-precisionDegree positioning technology determines the precise position of the image point, Finally, the spatial position of the target point is determined by the object image relationship. By analyzingComparative analysis of the spatial positions of feature points at different time points to determine the two-dimensional displacement changes of feature points and obtain the measured dataThe deformation parameters of the corresponding position of the structure, and the working principle are shown in the figure 3 As shown.

image 3 Schematic diagram of measurement principle

2. Function and Parameters

2.1 Function and Features

Based on machine vision and high-precision sub-pixel image algorithm technology, it has higher performance compared to traditional measurement sensorsAccuracy, and can simultaneously provide two-dimensional displacement data

Non contact measurement: The equipment adopts non-contact imaging method, which is less affected by environmental temperature and humidity, and can be used in full view

Can replace traditional static level to monitor bridge deflection and displacement;

One machine with multiple targets, high data correlation: reduces the cost of multi-point measurement and provides multi-point displacement parameters at the same time,

High sampling frequency: using hardware modules and algorithms for high-speed image acquisition, processing, storage, and transmission, with high efficiencyThe sampling frequency, To avoid missing data in unexpected events;

Watchdog Protection: Supports software and hardware watchdogs to ensure that devices work 24/7 without shutting down, ensuring the safety of the environmentReal time long-term monitoring in complex external environments;

Proprietary technology to avoid interference: The device adopts a special invisible light wavelength target, effectively avoiding visible light interference and interferenceReduce the interference caused by rainy and foggy weather.

2.2 Technical Specifications

3. install

3.1 Installation Diagram

As a form of deformation description, deflection can evaluate the quality and operational status of bridges, reflecting their stiffness. bridgeThe dynamic deflection of a beam is the most real-time response to the stiffness of a bridge and the most realistic response of a bridge under vehicle loads. In vehiclesUnder the action of load, the bridge structure will undergo greater deformation and stress than under the same static load, thus affecting the dynamic deflection of the bridgeMonitoring has important scientific research value and practical significance

The digital image displacement sensor used for bridge deflection measurement has high monitoring accuracy, large measurement range, multi-point deflection synchronous real-time measurement, small size, high reliability, easy installation and construction, and is suitable for long-term, online automated measurement. Target during deflection measurementInstalled at the location of the test point, rigidly connected to the target being tested; The digital image sensor is installed in a relatively stationary and stable position(Like bridge piers)After the image sensor in the sensor captures the changes in the target, the position of the target can be determined through image measurement algorithmsTime variation parameters are analyzed and calculated to obtain the displacement of the target, and then the dynamic deflection changes of the measured target are obtained for the long termMonitoring can also simultaneously obtain the static deflection changes of the bridge. The layout of measuring points and monitoring data are shown in the figure 4 As shown.