Ultrasonic signal denoising based on wavelet haar decomposition level

Herlinawati, Herlinawati; Murdika, Umi; Elan, Grienda; Yulianti, Titin

doi:10.1109/icitacee.2016.7892417

Cited by 2 publications

(3 citation statements)

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“…In the previous research about developing a conversion curve from an echo signal [12][13][14][15], the method to remove the noise of the signal is not discussed in detail, it is either because the echo signal can instantly be processed or because the need for signal pre-processing is not necessary. However, in some cases [14][15][16], a pre-processing is required for the echo signal in order to obtain the best quality of the signal parameters applied for developing a conversion curve.…”

Section: Related Workmentioning

confidence: 99%

“…A 3 MHz trigger signal is sent to the transducer by a signal generator (GW Instek GFG-3015). The transducer is a 3 MHz immersion probe transceiver (ISP5- [10][11][12][13][14][15][16][17][18][19][20] which has a focused beam with the focal length of 20 mm. The transducer transmits an ultrasonic wave that propagates through the multi-layered mediums.…”

Section: System Designmentioning

confidence: 99%

“…The Wavelet transform can also be applied to detect the peak of the signal more precisely, compared to the conventional peak detection such as curve fitting method. There are previously some researches which applied the Wavelet method in Ultrasonic field [14][15][16]. An analysis in time-frequency domain is also performed with the Scalogram as the output, to observe the parameters of the signal such as time, frequency, and the amplitude as the signal propagates through the medium.…”

Section: Introductionmentioning

confidence: 99%

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The Enhancement of 3 MHz Ultrasonic Echo Signal for Conversion Curve Development for Acoustic Impedance Estimation by Using Wavelet Transform

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Ultrasonic technology has already been applied for many applications. Most of them are mainly used for object measurement. Some techniques have been widely applied to particular measurement by utilizing a very specific component. In this research, the previous technique to develop a conversion curve to obtain the acoustic impedance of the target is adopted. Then, a 3 MHz concave shaped ultrasonic transducer for measuring liquids is proposed and a confirmation is needed to confirm if the system is correct. Therefore, several saline solutions with some known properties are used. A low voltage of 10 Volt pulse is sent to trigger the transducer. The ultrasonic wave is transmitted through the multilayered mediums, which is pure water, clear acrylic, and the target. The echo from the interface between the acrylic and the target is then received by the same transducer. Some parameters such as peak and Root Mean Square (RMS) are used to develop the conversion curve. A peak detection and comparison between the original echo and the processed one by using Wavelet transform is performed. Some analysis of the echo signal by using multiresolution and timefrequency analysis are also proposed. The result obtained from the measurement is then compared to the theoretical calculation. Based on the result, in terms of developing the conversion curve, only the RMS value of the Undecimated Wavelet Transform (UWT) which has the closest trend to the result of the calculation, with the mean percentage error of 0.65512%, which is the smallest value among all parameters.

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