In this research, a new type of corrosion monitoring technique for reinforce concrete was developed. The technique used piezoelectric sensors to detect the ultrasonic signals during corrosion. The mechanism of the method was presented. Experiment was carried out to monitor the corrosion process using piezoelectric sensors. The corrosion was also monitored using stain gauge for comparison.

Several studies in the area of vehicle detection and identification involve the use of probabilistic analysis and sensor fusion. While several sensors utilized for identifying vehicle presence and proximity have been researched, their effectiveness in identifying vehicle types has remained inadequate. This study presents the utilization of an ultrasonic sensor coupled with a magnetic sensor and...

In this work pits, obstacles and navigation of the module is developed for the effective driver control and safety navigation scheme is approached. The system consists of Bluetooth module, IR sensor, Ultrasonic sensor and microcontroller unit. Ultrasonic sensor is used to detect pits and uneven surfaces, IR sensors is used to detect obstacles on left and right sides of the system and using Blue...

A methodology for the predictive modeling of smart structures with in-situ sensing capability is presented and discussed. First, the smart structures concept is briefly reviewed. Then, self-sensing smart structures with in-situ sensing capabilities are introduced. Focus is placed on active sensing methods using ultrasonic guided waves in thin-wall structures. The challenges of modeling ultrason...

This paper investigates the effects that the Doppler shift will theoretically have on a complex ultrasonic rangefinding system that utilizes a ring of concurrently operating sensors, using unique codes to reduce cross-talk between individual sensors. A methodology for selecting pseudorandom codes to maximize autocorrelation performance, maximize Doppler tolerance, and minimize cross-talk is pre...

This paper presents a method for identification and distance detection for ultrasonic sensors of indoor mobile robot by using correlation scheme. The transmitted signal is identified by correlation between known model patterns and the patterned signal from transmitters and this scheme is useful when multiple sensors are involved. Distance detection by correlation is shown to be more accurate th...

A sonar array and a camera are the sensors of a robot that learns to move inside a building. Learning is based on the association of ultrasonic and visual images with motor commands. The two sensors extract diierent information from the environment. Sonars produce a short-range depth image on the sonar array plane, vision gives a wide-range at image of the space. In this work, a memory-based pr...

The embedded ultrasonic structural radar (EUSR) was developed based on phased array technology. It can interrogate large structural areas from a single location using ultrasonic guided Lamb and Rayleigh waves generated by tuned piezoelectric wafer active sensors (PWAS) that are permanently attached to the structure. This paper brings together several aspects of the implementation and applicatio...

Ultrasonic sensing of articulator movement is an area of multimodal speech recognition that has not been researched extensively. The widely-researched audio-visual speech recognition (AVSR), which relies upon video data, is awkwardly high-maintenance in its setup and data collection process, as well as computationally expensive because of image processing. In this thesis we explore the effectiv...