Deformation Monitoring System Based on 2D-DIC for Cultural Relics Protection in Museum Environment with Low and Varying Illumination

Quantifying the condition of large cultural relics, such as marine archaeological shipwreck, is important to verify stability and reliability. Deformation monitoring system plays a key role in the preservation and long-term conservation of cultural relics. Two-dimensional digital image correlation (2D-DIC) method has proven its efficiency in being able to provide accurate quantitative information of structural deformations. In this study, a deformation monitoring system with four cameras based on 2D-DIC is developed to perform noncontact, optically based measurement to monitor the deformation of shipwreck in museum environment with low and varying illumination. Because the consistency of the accuracy of 2D-DIC measurements for different locations is the most basic requirement in the application of structural deformation monitoring, selecting the appropriate exposure time and quantifying the bias errors on 2D-DIC measurements should be helpful to the optimal use of this optical nondestructive testing technique. A theoretical criterion is deduced to quantitatively characterize the dependence of interpolation bias upon natural patterns and illuminations. Then, an exposure adjustment scheme is built based on the aforementioned criterion. Numerical experiments reveal that the exposure adjustment scheme is able to provide consistency interpolation error for different natural patterns even though the environmental illumination is different as well. The deformation monitoring system with the proposed exposure adjustment scheme is promising for developing flexible and robust in situ structural health monitoring for use in museum environment with low and varying illumination, making 2D-DIC technique a really useful tool for in situ long-term monitoring of large cultural relics.

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Application of FBG Sensor in Shaft Structural Deformation Monitoring of JINCHUAN Mine No.3

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.5420 ◽

2011 ◽

Vol 243-249 ◽

pp. 5420-5426 ◽

Cited By ~ 2

Author(s):

Zeng Hui Liu ◽

Qian Gao ◽

Zhi Qiang Yang

Keyword(s):

Monitoring System ◽

Practical Experience ◽

Structural Condition ◽

Deformation Monitoring ◽

Reinforced Concrete Beams ◽

Structural Deformation ◽

Mine Shaft ◽

Monitoring Method ◽

Shaft Deformation

In order to effectively evaluate the security status of shaft and to make timely and accurate forecasts before the shaft break disaster, lead into fiber brag grating technology in the mine shaft deformation monitoring. Designing laboratory experiments verified FBG sensing the reliability of deformation and strain transfer law in reinforced concrete beams, while provide practical experience to the FBG sensors installed on the actual shaft structure. According to the structural condition of the main shaft of JINCHUAN Mine No.3, designed 8 monitoring sections in different level ingate upper and lower and installed fiber optic grating sensors, forming a fully automatic real-time and long-term deformation monitoring system. Initial monitoring results indicate that only the No.4 (down) sensors was failure, but the other seven monitoring sections can effectively detect the corresponding strain, and the monitoring system was stable. The fiber optical sensing technology has broad application prospects in the state's long-term monitoring deformation of the mine project, for the mine shaft deformation monitoring provides a more reliable monitoring method.

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Structural Health Monitoring System Based on FBG Sensing Technique for Chinese Ancient Timber Buildings

Sensors ◽

10.3390/s20010110 ◽

2019 ◽

Vol 20 (1) ◽

pp. 110 ◽

Cited By ~ 3

Author(s):

Shao-Fei Jiang ◽

Ze-Hui Qiao ◽

Ni-Lei Li ◽

Jian-Bin Luo ◽

Sheng Shen ◽

...

Keyword(s):

Structural Health Monitoring ◽

Monitoring System ◽

Health Monitoring ◽

Structural Deformation ◽

Beam Deflection ◽

Health State ◽

Health Monitoring System ◽

Structural Health ◽

Structural Health Monitoring System

Due to the long-term service, Chinese ancient timber buildings show varying degrees of wear. Thus, structural health monitoring (SHM) for these cultural and historical treasures is desperately needed to evaluate the service status. Although there are some FBG sensing-based SHM systems, they are not suitable for Chinese ancient timber buildings due to the differences in architectural types, structural loads, materials, and environment. Besides, a technical gap in Fiber Bragg grating (FBG) sensing-based column inclination monitoring exists. To overcome these weaknesses, this paper develops an FBG sensing-based structural health monitoring system for Chinese ancient Chuan-dou-type timber buildings that aims at monitoring structural deformation, i.e., beam deflection and column inclination, temperature, humidity, and fire around the building. An in-situ test and simulation analyses were conducted to verify the effectiveness of the developed SHM system. To validate the long-term-operation of the developed SHM system, monitoring data within 15 months were analyzed. The results show good agreement between the developed SHM system in this paper and other methods. In addition, the SHM system operated well in the first year after its deployment. This implies that the developed SHM system is applicable and effective in the health state monitoring of Chinese ancient Chuan-dou-type timber buildings, laying a foundation for damage prognosis of such types of timber buildings.

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Deformation Monitoring and Stability Analysis of Shaft Lining in Weakly Cemented Stratum

Advances in Civil Engineering ◽

10.1155/2018/8462746 ◽

2018 ◽

Vol 2018 ◽

pp. 1-12 ◽

Cited By ~ 1

Author(s):

Xianzhou Lyu ◽

Weiming Wang

Keyword(s):

Real Time ◽

Monitoring System ◽

Coal Mine ◽

Deformation Monitoring ◽

Dynamic Monitoring ◽

Thick Wall ◽

Additional Stress ◽

The Real ◽

Shaft Lining

Shaft linings in thick weakly cemented stratum have the disadvantages of large deformation and repeated damage after repair. Considering the typical geologic characteristics and the failure characteristics of shaft linings, we establish a multilayer automatic deformation monitoring system in this paper, and the monitoring system can realize the real-time, continuous, and long-term dynamic monitoring on shaft linings. Based on the concrete strength failure criterion under biaxial compression and the analytical solution for spatially axisymmetric problem of thick-wall cylinders, the damage limit of the shaft lining in Xieqiao coal mine is obtained. Then, we choose three sections as the test area according to the typical damage forms of shaft linings to carry out the monitoring scheme on the auxiliary shaft in Xieqiao coal mine. The monitoring results show that the extreme value of the shaft lining deformation is 2.369 mm. And the shaft lining located in the border between the floor aquifer and the bedrock generates the most severe deformation, which is about 89.4% of the deformation limit. The shaft lining deformation increment fluctuates in certain range, which belongs to elastic deformation. Finally, we inverse the stress state according to the deformation value of the shaft lining, and the obtained additional stress is found to be lower than the ultimate compressive strength. Long-term project practice confirms that the deformation monitoring results can reflect the real stress condition of the shaft lining and that the monitoring system can realize the real-time dynamic evaluation for the status of the shaft lining.

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A Novel Contact Tunnel Profile Monitoring System: Concept and Application

Mathematical Problems in Engineering ◽

10.1155/2020/6617976 ◽

2020 ◽

Vol 2020 ◽

pp. 1-14

Author(s):

Yang Han ◽

Shikun Pu ◽

Lei Gao ◽

Jianli Duan ◽

Erbing Li

Keyword(s):

Monitoring System ◽

Cross Section ◽

Deformation Monitoring ◽

Remote Access ◽

Displacement Sensor ◽

Profile Monitoring ◽

Underground Engineering ◽

Optimal Monitoring ◽

Tunnel Cross Section

The displacement of the cross section directly reflects the stress state and stability of the surrounding rock and structure, so the monitoring of it is essential during the construction and operation of the tunnel and underground engineering, particularly under the conditions of earthquake and other geological disasters. This paper introduces a new contact tunnel profile monitoring system (TPMS) in detail that uses a tilt sensor and a displacement sensor as data acquisition devices. According to the relation between the sensing physical quantity and displacement change, the displacement calculation formulas of the tunnel cross section measuring points based on the two-dimensional plane coordinate system were deduced, and in order to eliminate the actual installation and positioning deviation of the monitoring system, the method of obtaining the optimal monitoring plane and converting coordinates of the measuring points was proposed, thus establishing the theoretical basis for the application of the TPMS. With the Beishan exploration tunnel (BET) in China as the test platform, the TPMS was successfully applied for long-term monitoring. The application experience showed that the TPMS can realize continuous monitoring, automatic collection and transmission of the monitoring data, remote access whenever necessary, without affecting the transportation in the tunnel, and high accuracy, which reaches 0.01 mm. This system provides a new simple and effective method with good generality and applicability for the deformation monitoring of the tunnel and underground engineering.

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Comparison of an open path differential optical absorption spectroscopy system and a conventional in situ monitoring system on the basis of long-term measurements of SO2, NO2, and O3

Atmospheric Environment ◽

10.1016/s1352-2310(01)00216-3 ◽

2001 ◽

Vol 35 (24) ◽

pp. 4059-4072 ◽

Cited By ~ 31

Author(s):

Ki-Hyun Kim ◽

Min-Young Kim

Keyword(s):

Optical Absorption ◽

Monitoring System ◽

Absorption Spectroscopy ◽

Differential Optical Absorption Spectroscopy ◽

In Situ Monitoring ◽

Optical Absorption Spectroscopy ◽

Open Path ◽

Spectroscopy System

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IN-SITU, LONG-TERM MONITORING SYSTEM FOR RADIOACTIVE CONTAMINANTS

10.2172/820568 ◽

2002 ◽

Author(s):

James S. Durham ◽

Stephen W.S. McKeever ◽

Mark S. Akselrod

Keyword(s):

Monitoring System ◽

Long Term Monitoring ◽

Term Monitoring

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IN-SITU, LONG-TERM MONITORING SYSTEM FOR RADIOACTIVE CONTAMINANTS

10.2172/811439 ◽

2002 ◽

Author(s):

James S. Durham ◽

Stephen W.S. McKeever ◽

Mark S. Akselrod

Keyword(s):

Monitoring System ◽

Long Term Monitoring ◽

Term Monitoring

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Spectral Aerosol Extinction Monitoring System (SÆMS): setup, observational products, and comparisons

Atmospheric Measurement Techniques Discussions ◽

10.5194/amtd-6-8647-2013 ◽

2013 ◽

Vol 6 (5) ◽

pp. 8647-8677 ◽

Cited By ~ 2

Author(s):

A. Skupin ◽

A. Ansmann ◽

R. Engelmann ◽

H. Baars

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Monitoring System ◽

Aerosol Extinction ◽

Extinction Coefficients ◽

Spectrally Resolved ◽

Automated Instrument

Abstract. A Spectral Aerosol Extinction Monitoring System (SÆMS) is presented that allows us to continuously measure the spectral extinction coefficient of atmospheric aerosol particles along an about 2.7 km long optical path at 30–50 m height above ground at Leipzig (51.3° N, 12.4° E), Germany. The fully automated instrument measures the ambient aerosol extinction coefficients from 300–1000 nm. The main goal of SÆMS observations are long-term studies of the relationship between particle extinction and relative humidity from below 40 % to almost 100 %. The setup is presented and observations (a case study and statistical results for 2009) are discussed in terms of time series of 550 nm particle optical depth, Ångström exponent, and particle size distribution retrieved from the spectrally resolved extinction. The SÆMS measurements are compared with simultaneously performed EARLINET lidar, AERONET photometer, and in situ aerosol observations of particle size distribution and related extinction coefficients at the roof of our institute. Consistency between the different measurements is found which corroborates the quality of the SÆMS observations.

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