Journal of Pure and Applied Ultrasonics

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Divergence Controlled Ultrasonic array for 3-D Imaging


Affiliations
1 Department of Electrical and Electronics Engineering, Aichi Institute of Technology, Toyota, 1247 Yachigusa, Yakusa-Cho, Toyota, 470-0392, Japan
 

In this paper we present the experimental studies on characteristics of isotropic divergence controlled ultrasonic phased array transmitter (PAT) with wide field-of-view in range sensing and imaging. In earlier theoretical and experimental investigations it was demonstrated that a long range sensor and imaging system is feasible with an increased high power of an ultrasonic array transmitter just by increasing a number of ultrasonic transmitter elements. An increase in the range sensing abilities of a high power ultrasonic PAT, however, limits its fieldof- view angle up to a few degrees as compared to the conventional range imaging method due to high directionality through beam formation. Thus, any improvement in the field-of-view angle requires a divergence control of an ultrasonic PAT by controlling the delay-time of 40 kHz signal modulated as pulse of 2 ms for each element. We, successfully characterized isotropic divergence controlled ultrasonic PAT to compare our experimental results with the theoretical simulations. An object detection field-of-view angle of 18° has been confirmed at the divergence angle of 20° by our ultrasonic PAT with relatively reduced range imaging, which was still higher than that of a range measurement reported by conventional ultrasonic system. In this paper we have considered a simple isotropic divergence controlled ultrasonic PAT for wider field-of-view in range sensing.

Keywords

3-D Range Sensing System, Ultrasonic Phased Array Transmitter, Isotropic Divergence, Delay-Time.
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  • Divergence Controlled Ultrasonic array for 3-D Imaging

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Authors

Sahdev Kumar
Department of Electrical and Electronics Engineering, Aichi Institute of Technology, Toyota, 1247 Yachigusa, Yakusa-Cho, Toyota, 470-0392, Japan
Hideo Furuhashi
Department of Electrical and Electronics Engineering, Aichi Institute of Technology, Toyota, 1247 Yachigusa, Yakusa-Cho, Toyota, 470-0392, Japan

Abstract


In this paper we present the experimental studies on characteristics of isotropic divergence controlled ultrasonic phased array transmitter (PAT) with wide field-of-view in range sensing and imaging. In earlier theoretical and experimental investigations it was demonstrated that a long range sensor and imaging system is feasible with an increased high power of an ultrasonic array transmitter just by increasing a number of ultrasonic transmitter elements. An increase in the range sensing abilities of a high power ultrasonic PAT, however, limits its fieldof- view angle up to a few degrees as compared to the conventional range imaging method due to high directionality through beam formation. Thus, any improvement in the field-of-view angle requires a divergence control of an ultrasonic PAT by controlling the delay-time of 40 kHz signal modulated as pulse of 2 ms for each element. We, successfully characterized isotropic divergence controlled ultrasonic PAT to compare our experimental results with the theoretical simulations. An object detection field-of-view angle of 18° has been confirmed at the divergence angle of 20° by our ultrasonic PAT with relatively reduced range imaging, which was still higher than that of a range measurement reported by conventional ultrasonic system. In this paper we have considered a simple isotropic divergence controlled ultrasonic PAT for wider field-of-view in range sensing.

Keywords


3-D Range Sensing System, Ultrasonic Phased Array Transmitter, Isotropic Divergence, Delay-Time.

References