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Characterization of ultrasonic transducer for automotive proximity sensing application.
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on November 21, 2019 by SAE International in United States
Event: NuGen Summit
The automotive industry has seen the rise in safety norms and regulation in recent years. Achieving optimum performance and reducing cost while designing the overall system is biggest challenge. AIS -145 is one of the popular norm which will become mandatory after 2020. AIS -145 is park assistance system based upon the proximity sensing application. This paper deals with characterization of ultrasonic transducers for automotive proximity-based sense application. Characterization of ultrasonic transducer is important to achieve optimum performance and functionality of overall system. The objectives of this work is to characterize the ultrasonic transducer for different vehicle environment and sensor parameters. The vehicle environment such as chassis, bumper and sensor mounting location and sensor parameters such as transducer gain, transducer operating frequency, transducer driver threshold has significant effect on the proximity sensor -ultrasonic transducer sensitivity performance. To realize this, there is need of practical approach and optimization of ultrasonic transducer parameters. This research in turn will help to reduce development time of proximity sensors for different vehicle environment, increase in reliability which adds intelligent system and assistance to driver. We will perform simulation and for ultrasonic sensor performance. The ultrasonic transducer performance is seen with ultrasonic power measurement acoustic chamber and real time environment. The power and directivity of ultrasonic transducer is studied with respect to transducer parameters such as transducer gain, transducer operating frequency, transducer graph threshold values, ringing time and vehicle environment. The transducer power variation is studied with piezoelectric transducer, transducer driver, acoustic chamber, ultrasonic microphone and signal processing in MATLAB. It is intended that the simulation result and practical result will show high degree of correlation.