Ultrasonic Wave-Speed Diffraction Tomography With Undersampled Data Using Virtual Transducers

Cross linked polyethylene is widely used in the manufacturing of tanks for the agriculture, petroleum and chemical industries. These tanks are exposed to a number of environmental effects, which can lead to material degradation. Ultrasonic wave speed change is a method that shows promise in evaluating the UV degradation effects. In order to evaluate the UV effects in the field, however, the effect of stress and temperature on the wave speed must first be established. A series of tests were performed to establish the ultrasonic properties in cross linked as well as natural polyethylene at a range of temperatures from −6 deg C to 44 deg C (22 deg F to 112 deg F). The change is linear, as expected. For the stress tests, the velocity decreased with tension, also as expected. Tests were performed from approximately 689 kPa to 9.6 MPa (100 psi to 1400 psi). Results from these tests were incorporated into the overall algorithm used for evaluating tank degradation.

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Ekstraksi Pektin dari Limbah Kulit Jeruk (Citrus sinensis) dengan Metode Ekstraksi Gelombang Ultrasonik Menggunakan Pelarut Asam Klorida (HCl)

Jurnal Teknik Kimia USU ◽

10.32734/jtk.v8i2.2036 ◽

2019 ◽

Vol 8 (2) ◽

pp. 85-89

Author(s):

Delvia Ariska Damanik ◽

Setiaty Pandia

Keyword(s):

Ultrasonic Wave ◽

Cell Walls ◽

Citrus Sinensis ◽

Galacturonic Acid ◽

Wave Speed ◽

Ash Content ◽

Plant Cell Walls ◽

Effect Of Solvent ◽

Orange Peels ◽

Food And Beverage

Pectin is complex polysaccharide contained D-galacturonic acid bonded by α -1,4 glucosidic in plant cell walls. Pectin widely used in pharmaceutical, food and beverage industries. This study evaluates the effect of solvent and stirring speed on pectin characteristic. The study utilizes ultrasonic wave and acid solvent at the presence of ethanol to yield pectin following by drying to obtain dried pectin. This study carries out using 25 grams orange peels, 10 %, chloride acid solvent, 60 minutes extraction time, temperature of 60 oC, ultrasonic wave speed 50 KHz and 16 hours settling time at various solvent concentrations 0.025 N; 0.05 N; 0.075 N and stirring speed 0 rpm; 50 rpm; 100 rpm; 150 rpm. The results showed that the highest yield of pectin extraction was obtained at concentration of 0.075 N with 20.12 %; stirring speed 150 rpm, water content 8.0 %; 4,0 % ash content, and 7.44 % methoxyl content.

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POINT SOURCE/POINT RECEIVER ULTRASONIC WAVE SPEED MEASUREMENT

Ultrasonics International 87 ◽

10.1016/b978-0-408-02348-1.50086-x ◽

1987 ◽

pp. 509-513

Author(s):

Nelson N. Hsu ◽

Donald G. Eitzen

Keyword(s):

Point Source ◽

Ultrasonic Wave ◽

Wave Speed ◽

Source Point ◽

Speed Measurement

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Determining protein concentration in milk mixtures by measuring speed of ultrasonic waves travelling through milk and comparing with ultrasonic wave speed in distilled water

Food Control ◽

10.1016/0956-7135(94)90153-8 ◽

1994 ◽

Vol 5 (1) ◽

pp. 56

Keyword(s):

Ultrasonic Wave ◽

Protein Concentration ◽

Wave Speed ◽

Ultrasonic Waves ◽

Distilled Water

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Application of the Transfer Function for Measuring Ultrasonic Wave Speed in Engineering Materials

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award ◽

10.1115/95-gt-368 ◽

1995 ◽

Cited By ~ 1

Author(s):

Gary G. Leisk ◽

Anil Saigal ◽

J. M. Pereira

Keyword(s):

Transfer Function ◽

Ultrasonic Wave ◽

Wave Speed ◽

Cross Correlation ◽

Function Technique ◽

Correlation Technique ◽

Slope Analysis ◽

Phase Slope ◽

Analysis Technique ◽

Cross Correlation Technique

Ultrasonic testing is used in determining mechanical properties such as modulus of elasticity, shear modulus, and Poisson’s ratio, in characterizing microstructures, and in detecting flaws. One application of ultrasound, known as acoustoelasticity, involves the measurement of ultrasonic wave speed in solid materials as a function of applied stress. Due to the high resolution that is required, a type of phase-slope analysis technique known as the transfer function technique is introduced as an alternative to the popular cross-correlation technique for measuring ultrasonic wave speed. Time delay results from software-simulated sinusoidal waveforms and measurements of the acoustoelastic response of aluminum 6061-T6 and stainless steel show that significant improvement in resolution and reduction in calculation time can be achieved by using the transfer function technique.

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