scholarly journals Development of Analog to Digital Interface for Scalable Ultrasonic Sensor Array

2017 ◽  
Author(s):  
Yuichi Morita ◽  
Sota Kono ◽  
Akira Yamawaki
Keyword(s):  
Sensor Array ◽  
Ultrasonic Sensor ◽  
Digital Interface ◽  
Analog To Digital

scholarly journals Gas Leak Location Detection Based on Data Fusion with Time Difference of Arrival and Energy Decay Using an Ultrasonic Sensor Array

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2985 ◽  
Author(s):  
Tao Wang ◽  
Xiaoran Wang ◽  
Mingyu Hong
Keyword(s):  
Data Fusion ◽  
Sensor Array ◽  
Three Dimensional ◽  
Energy Decay ◽  
Ultrasonic Sensor ◽  
Time Difference Of Arrival ◽  
Leak Location ◽  
Gas Leak ◽  
Location Algorithm ◽  
The Individual

Ultrasonic gas leak location technology is based on the detection of ultrasonic waves generated by the ejection of pressured gas from leak holes in sealed containers or pipes. To obtain more accurate leak location information and determine the locations of leak holes in three-dimensional space, this paper proposes an ultrasonic leak location approach based on multi-algorithm data fusion. With the help of a planar ultrasonic sensor array, the eigenvectors of two individual algorithms, i.e., the arrival distance difference, as determined from the time difference of arrival (TDOA) location algorithm, and the ratio of arrival distances from the energy decay (ED) location algorithm, are extracted and fused to calculate the three-dimensional coordinates of leak holes. The fusion is based on an extended Kalman filter, in which the results of the individual algorithms are seen as observation values. The final system state matrix is composed of distances between the measured leak hole and the sensors. Our experiments show that, under the condition in which the pressure in the measured container is 100 kPa, and the leak hole–sensor distance is 800 mm, the maximum error of the calculated results based on the data fusion location algorithm is less than 20 mm, and the combined accuracy is better than those of the individual location algorithms.

Proposal of an ultrasonic sensor array with flexible and scalable organization

2018 ◽  
Vol 24 (2) ◽  
pp. 189-194
Author(s):  
Yuichi Morita ◽  
Sota Kono ◽  
Akira Yamawaki
Keyword(s):  
Sensor Array ◽  
Ultrasonic Sensor

scholarly journals Reconstruction of Temperature Distribution in a Steel Block Using an Ultrasonic Sensor Array

2014 ◽  
Vol 33 (3) ◽  
pp. 458-470 ◽  
Author(s):  
A. Gajdacsi ◽  
A. J. C. Jarvis ◽  
P. Huthwaite ◽  
F. B. Cegla
Keyword(s):  
Temperature Distribution ◽  
Sensor Array ◽  
Ultrasonic Sensor

Front-end processor using BBD distributed delay-sum architecture for micromachined ultrasonic sensor array

2003 ◽  
Vol 12 (4) ◽  
pp. 506-512 ◽  
Author(s):  
Yaowu Mo ◽  
T. Tanaka ◽  
K. Inoue ◽  
K. Yamashita ◽  
Y. Suzuki
Keyword(s):  
Sensor Array ◽  
Distributed Delay ◽  
Ultrasonic Sensor ◽  
Front End

scholarly journals Iterative Signal Processing for Mitigation of Analog-to-Digital Converter Clipping Distortion in Multiband OFDMA Receivers

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
Markus Allén ◽  
Toni Levanen ◽  
Jaakko Marttila ◽  
Mikko Valkama
Keyword(s):  
Fundamental Problem ◽  
Turbo Decoding ◽  
Laboratory Measurements ◽  
Digital Interface ◽  
Analog To Digital ◽  
Front End ◽  
Digital Hardware ◽  
Receiver Performance ◽  
Almost All ◽  
Clipping Distortion

In modern wideband communication receivers, the large input-signal dynamics is a fundamental problem. Unintentional signal clipping occurs, if the receiver front-end with the analog-to-digital interface cannot respond to rapidly varying conditions. This paper discusses digital postprocessing compensation of such unintentional clipping in multiband OFDMA receivers. The proposed method iteratively mitigates the clipping distortion by exploiting the symbol decisions. The performance of the proposed method is illustrated with various computer simulations and also verified by concrete laboratory measurements with commercially available analog-to-digital hardware. It is shown that the clipping compensation algorithm implemented in a turbo decoding OFDM receiver is able to remove almost all the clipping distortion even under significant clipping in fading channel circumstances. That is to say, it is possible to nearly recover the receiver performance to the level, which would be achieved in the equivalent nonclipped situation.

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