Journal ArticleDOI
A pulsed ultrasonic distance measurement system based upon phase digitizing
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TLDR
In this article, a pulsed ultrasonic distance measurement system (UDMS) for use in air is described, which is based upon the transmission of a binary-frequency shift-keyed (BFSK) signal followed by data acquisition and signal processing of phase-digitized information from the received signal.Abstract:
A pulsed ultrasonic distance measurement system (UDMS) for use in air is described. A new method of timing is presented that is based upon the transmission of a binary-frequency shift-keyed (BFSK) signal followed by data acquisition and signal processing of phase-digitized information from the received signal. The method reduces many of the problems that arise when dealing with the nonideal behavior of ultrasonic transducers. One of the major advantages is the ease with which the method may be implemented while maintaining high accuracy, since amplitude sampling is not required. Comparison with common ranging techniques is presented, which shows the inherent noise immunity of the new method. A test setup is described, and results given, demonstrating the underlying principle and accuracy. The system measures distances of up to 5000 mm with an accuracy of /spl plusmn/1 mm. >read more
Citations
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Journal ArticleDOI
In-Air Rangefinding With an AlN Piezoelectric Micromachined Ultrasound Transducer
Richard J. Przybyla,Steven E. Shelton,Andre Guedes,Igor Izyumin,Mitchell Kline,David A. Horsley,Bernhard E. Boser +6 more
TL;DR: In this paper, the transducer consists of a piezoelectric AlN membrane with 400-μm diameter, which was fabricated using a low-temperature process compatible with processed CMOS wafers.
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Digital signal processing techniques for accurate ultrasonic sensor measurement
TL;DR: In this paper, the authors employed a suitable time-frequency representation (Wavelet Transform or Short Time Fourier Transform) to extract the envelope of reflected pulse echo, together with a suitable pulse detection algorithm (threshold or correlation) for time-of-flight estimation.
Journal ArticleDOI
Distance Measurement of an Object or Obstacle by Ultrasound Sensors using P89C51RD2
TL;DR: In this paper distance measurement of an obstacle by using separate ultrasonic transmitter, receiver and a microcontroller is presented and the experimental setup and results are described.
Journal ArticleDOI
Multiple-frequency continuous wave ultrasonic system for accurate distance measurement
TL;DR: In this article, a multiple-frequency continuous wave ultrasonic range-measuring system for use in air is described based on the comparative phase shifts generated by three continuous ultrasonic waves of different but closely spaced frequencies.
Journal ArticleDOI
Multiple-frequency ultrasonic distance measurement using direct digital frequency synthesizers
Ke-Nung Huang,Yu-Pei Huang +1 more
TL;DR: This study proposes the direct digital frequency synthesizers (DDFSs) algorithm to accurately generate multiple frequencies for MFCW distance measurement and indicates that the main advantages of this distance measurement are high accuracy, increased range and ease of implementation.
References
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Digital time-of-flight measurement for ultrasonic sensors
TL;DR: In this paper, the authors present a digital algorithm for pulse-echo measurement applications, based on the use of a cross-correlation function to determine the time of flight (TOF).
Journal ArticleDOI
Digital signal processing techniques for high accuracy ultrasonic range measurements
TL;DR: Several digital signal processing (DSP) methods are analyzed and compared with respect to the expected errors for an ultrasonic range measurement arrangement, although all of them allow reduction of errors by several orders of magnitude.
Journal ArticleDOI
Phase digitizing sharpens timing measurements
TL;DR: In this paper, a measurement technique called phase digitizing is presented, which continuously counts a signal's zero-crossings and records exactly when they occur, for the case of spread-spectrum measurements.
Journal ArticleDOI
A Fully Compensated Digital Ultrasonic Sensor for Distance Measurement
P. K. Chande,P. C. Sharma +1 more
TL;DR: In this article, a distance measurement system using an ultrasonic transducer is described, which is based on comparison of the unknown distance with a standard length in the same medium.
Journal ArticleDOI
Modern methods of improving the range accuracy of CTFM sonars
TL;DR: A practical approach for achieving the above specifications is described and illustrations are given for two measuring instruments: an underwater sonar system for quantitative assessment of fish population, and a diagnostic sonar.