although fiber optic sensor has the characteristics of high reliability and high accuracy, but because it is a state of cable, laying artificial and cost is a problem. Therefore, & other; To combine with wireless, easy to complete set of sensor nodes has recently become a popular in consulting & throughout; .
Using optical fiber to provide bridge monitoring system can NTT data are using wireless acceleration sensor monitoring and control system development. In the verification experiments, NTT data respectively installed on the bridge without linear acceleration sensor and optical fiber sensor, and has carried on the contrast to the two. According to data, & other; Determine the natural frequency of the bridge state need basic consistent throughout & test results; , indicating that no linear acceleration sensor can replace optical fiber sensor.
Not only the NTT data, many companies are working on the use of acceleration sensor. This is because the acceleration sensor to get health monitoring and local monitoring business such as the main data you need.
Without acceleration sensor for monitoring specially developed social infrastructure, the other the USES of gm products. Roma are currently cooperating with tsinghua university, to carry out the verification experiment on the bridge in wuxi city, jiangsu province, the experimental use of is a wholly owned subsidiary of the company & mdhistriadn; & mdhistriadn; The United States Kibureaux smartphone with 3 axis acceleration sensor. Both by 26 acceleration sensor on the bridge configuration, build the wireless sensor network (WSN), & other; Accurate data collected in the vibration frequencies of the bridge & throughout; .
Roma are working with tsinghua university of China, on the bridge in wuxi city, jiangsu province on wireless sensor network to carry out the verification experiment. Install the 26 vibration acceleration sensor.
In addition to the acceleration sensor, image processing, related research is also in progress. Production of research production using measurement technology research center under the mechanical stimulation light & other; Stress & luminaries throughout; That is invisible to the naked eye is developed, and concrete strain and crack visual monitoring system. Function of the system is to show the shape distribution of crack and fracture degree of progress, can be applied to bridge construction such as the maintenance of inspection and maintenance and management.
(1) the infrastructure monitoring system based on wireless sensor network (WSN) is currently in Europe are also carried out verify experiment, which also incorporates energy harvesting technology. For example, in April 2010 to March 2013 on the implementation of & other; BureauintSI (naifchangeorganisationsorgainimpactforstructuralBuddhisoscineoanulus) & throughout; On is building Bridges and subway facilities, use by light, vibration, temperature difference power generation device to drive the sensor. BureauintSI staff to speculate that the European infrastructure maintenance management and update the cost up to & other; At least 1 trillion euro & throughout; Based on wireless sensor network monitoring market expected & other; Will amount to tens of billions of euros in & throughout; .
Murata manufacturing is considering to have anti skid car market (ESC) function, as well as aircraft, machine building, railway and other fields by the acceleration sensor is applied to the social infrastructure.
Japan's industrial technology research institute to develop mechanical stress of the luminous light source preparation applied to construction monitoring. You can't see can find visual cracks.
Has will be put into commercial operation of optical fiber NTT data in order to achieve a new generation system, also in promoting the wireless. The company first developed 3 axis acceleration sensor and the combination of wireless communication system, is currently on the verification experiment. & other; If on the premise of a sensor installed on the existing buildings, so wireless module has advantages in many aspects such as the cost and time limit for a project are & throughout; (NTT data area business headquarters department of homeland security electronic community as minister Lin Lunzhang).
Stress is luminous body converts mechanical energy into light energy. Is the coating containing powdered ceramic particles. When daub is on the surface of concrete construction, stress concentration areas of the particles will glow. Production of research development of the system is monitored by stress luminophor, luminous intensity distribution of cameras, according to the luminous intensity diagnosis structure of database, and integration of the above elements network system, etc.
About 50 years on its completion in the daub on the main girder of the bridge stress luminosity, the usefulness and effectiveness of monitoring and control system has been verified. Stress luminous successfully presented the visual image is difficult to find minor cracks and strain inside the concrete. Currently, the Japanese production of research are kajima cooperation with large construction company, in the mountain area of tunnel Watson instrument to stress the application of light within the tao to carry out the verification experiment. Stress luminous body study the leadership of the production of research Xu Chaonan stress luminous technology group leader (the center), said during a presentation on results & other; At the scene of the tunnel was improved the precision of the visual inspection & throughout; .
As for the future subject, Xu Chaonan considered how to establish evaluation method, this is because & other; The size of the luminous intensity and fracture quantitative judgment and lethal damage to buildings. Each building with different components and architecture of summary evaluation method is not easy. Therefore, the production of research Xu Chaonan said is & other; Prepared with rich knowledge of civil and construction companies and research institutions to promote practical & throughout; .
