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Furuhashi, Hideo
- Anisotropic Divergence Controlled Ultrasonic Transmitter Array for Three-Dimensional Range Imaging
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1 Department of Electrical and Electronics Engineering, Aichi Institute of Technology, 1247, Yachigusa, Yakusa-Cho, Toyota, 470-0392, JP
1 Department of Electrical and Electronics Engineering, Aichi Institute of Technology, 1247, Yachigusa, Yakusa-Cho, Toyota, 470-0392, JP
Source
Journal of Pure and Applied Ultrasonics, Vol 38, No 3 (2016), Pagination: 49-57Abstract
A simple, cost effective and long-range three-dimensional (3D) measurement system has been developed using ultrasonic sound. The developed system consists of a high-power ultrasonic transmitter array (UTA) and an ultrasonic receiver array (URA). In some particular cases, measurement in wide horizontal plane is required instead of vertical direction. Therefore, anisotropic divergence control has been proposed and successfully controlled maintaining high peak power in the horizontal direction. The characteristics of the UTA are compared with the theory by generating a 40 kHz ultrasonic signal with modulated pulse width 2 ms. The measurable range without divergence control has been obtained over 17 m ± 0.5 m. Measurable range with anisotropic divergence control has been improved to 16 m ± 0.5 m on the isotropic divergence control from 14 m ± 0.5 m at the same divergence angle 10°. Awidest view angle has been obtained at 20° with the isotropic divergence control and further improvement in the view angle is observed with the anisotropic divergence control.Keywords
3d Measurement System, Ultrasonic Transmitter Array, Anisotropic Directivity, Delay Time, Range Image.Full Text
- Characteristics of an Ultrasonic Array Transmitter in the Short Range
Abstract Views :178 |
PDF Views:0
Authors
Affiliations
1 Department of Electrical and Electronics Engineering, Aichi Institute of Technology, 1247, Yachigusa, Yakusa-Cho, Toyota, 470-0392, JP
1 Department of Electrical and Electronics Engineering, Aichi Institute of Technology, 1247, Yachigusa, Yakusa-Cho, Toyota, 470-0392, JP
Source
Journal of Pure and Applied Ultrasonics, Vol 39, No 1 (2017), Pagination: 27-33Abstract
An ultrasonic array transmitter (12 × 12) has been developed and its theoretical studies were conducted in the short range. In the far field (>5 m), sound pressure level decreases exponentially with the distance. We have studied the effects of short pulse modulation on the array transmitter in the range from 0.5 m to 2 m to compare with our theoretical results. The sound pressure amplitude reduction in this region by 1/r does not follow the same as in the case of far field. The sound pressure level at 1 m wasabove 143 dB which can be considered to be useful for the biomedical applications.We also studied the normal reflected pulse from living and non-living object.Keywords
Ultrasonic Array Transmitter, Short Range, Pulse Modulation.Full Text
References
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- Kumar S., Ichi K. and Furuhashi H., Theoretical investigation of high-power ultrasonic array transmitter for a range sensor in air, Proc. of IEEE DOI:10.1109/ ICIT.2013.
- Kumar S., Wei Q. and Furuhashi H., Characteristics of high-power ultrasonic array transmitter in air, Proc. IEEE 2015, Int. conf. on recent developments in control, automation and power engineering (RDCAPE 2015), 2015, pp.209-213. DOI:10.1109/RDCAPE.2015.7281397.
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- Divergence Controlled Ultrasonic array for 3-D Imaging
Abstract Views :209 |
PDF Views:0
Authors
Affiliations
1 Department of Electrical and Electronics Engineering, Aichi Institute of Technology, Toyota, 1247 Yachigusa, Yakusa-Cho, Toyota, 470-0392, JP
1 Department of Electrical and Electronics Engineering, Aichi Institute of Technology, Toyota, 1247 Yachigusa, Yakusa-Cho, Toyota, 470-0392, JP
Source
Journal of Pure and Applied Ultrasonics, Vol 40, No 3 (2018), Pagination: 63-72Abstract
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.Full Text
References
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- Kumar S., Ichi K. and Furuhashi H., Theoretical investiga-tion of high-power ultrasonic array transmitter for a range sensor in air, Proc. IEEE, Int. conf. on industrial techno-logy ICIT 2013, IEEE Xplore 2013, (2013) 1190-1195.
- Kumar S., Wei Q. and Furuhashi H., Characteristics of High-Power ultrasonic array transmitter in air, Proc. IEEE 2015, Int. conf. on recent developments in control, automation and power engineering (RDCAPE 2015), (2015) 209-213.
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- Kumar S. and Furuhashi H., Anisotropic divergence controlled ultrasonic transmitter array for threedimensional range imaging, J. Pure Appl. Ultrason, 38 (2016) 49-57.
- Kumar S. and Furuhashi H., Long-range measurement system using ultrasonic range sensor with high-power transmitter array in air, Ultrasonics, 74 (2017) 186-195.