A review of some advanced sensors used for health diagnosis of civil engineering structures

The developments in structural health monitoring techniques have led to the invention of various sensors that can be effective damage indicator. Due to environmental or electromagnetic effects and need for constant energy source, the traditional sensors are unable to provide accurate and continuous measurements. In light of these events, new and improved sensors have been developed, along with wireless technology, to assist the monitoring process. With the need of detecting more than one damage parameters, multiplexed sensors have been the main interest of researchers. This paper deals with the different sensors used for determination of strain, acceleration and corrosion. A brief comparative study has been performed and presented in the following review paper. Multiplexed Fiber optics sensor have proved quite effective for SHM and proved to be a good competitor with other sensors. Optimum Sensor Placement technique developed for low level damage diagnosis is Iterated Improved Reduced System (IIRS) Method.