Operating principle of a high resolution ultrasonic ranging system based in a phase processing

Laura X. Chaparro; Carlos R. Contreras; Jaime E. Meneses

doi:10.1117/12.2025832

18 November 2013 Operating principle of a high resolution ultrasonic ranging system based in a phase processing

Laura X. Chaparro, Carlos R. Contreras, Jaime E. Meneses

Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 87853D (2013) https://doi.org/10.1117/12.2025832
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal

Abstract

Traditionally, ultrasonic ranging sensors emit pulse trains. The distance traveled by the received signal is calculated from its delay with respect to the emitted signal. There are different strategies to encode the signal in order to determine the delay. In this paper we present a method for encoding amplitude that encodes the amplitude of a signal formed by rectangular pulse trains whose frequency is 40 kHz. The pulse amplitude is encoded in a binary manner according to a pseudorandom sequence. Owing to that the emitted signal is formed by pulse trains whose amplitude is modulated, the impulse response of the designed system generates sinusoidal pulse trains whose amplitude is variable. The proposed strategy uses the phase of signal to position temporally each pulse trains. This positioning has higher precision than the sampling time of the signal.

Citation Download Citation

Laura X. Chaparro, Carlos R. Contreras, and Jaime E. Meneses "Operating principle of a high resolution ultrasonic ranging system based in a phase processing", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87853D (18 November 2013); https://doi.org/10.1117/12.2025832

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