Fast-response ultrasonic sensor system for piezoceramics
Date Issued
2006
Date
2006
Author(s)
Wu, Yung-Yi
DOI
zh-TW
Abstract
A new digital-signal-processing method combining ultrasonic time-of-flight with phase detection estimation is presented. The method uses the digital pulse width modulation to acquire ultrasonic signal in order to accurately estimate the responding time of the echo. It is also possible to assure reduced bias and uncertainty in digital filtering measurements, such as those involving low measurement errors of echo signal. A number of numerical tests are conducted on simulated signals with the aim of the good performance when operating in real-time conditions.
There are five topics in the thesis, including ultrasonic transducer, ultrasonic sensor, circuit simulation, circuit design, and signal process. Users could follow the steps in the chapter to realize the system working stage. Results attained in DPWM-based distance measurements will finally give the top reliability and max efficiency in the actual ultrasonic tests.
The main contributions of this distance measurement system reduce the responded time and get powerful information in long distance. It is easily achieved by supersonic data stream model to build up the target.
Subjects
壓電
超音波
距離量測
飛行時間法
相位偵測法
piezoceramics
ultrasonic
distance estimation
time-of-flight
phase detection
Type
thesis
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