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  1. The table below lists typical longitudinal wave ultrasonic velocities in a variety of common materials that can be measured with ultrasonic thickness gauges. Note that this is only a general guide.

  2. Find the longitudinal sound velocity, density and acoustic impedance of various liquids, plastics and solids at different temperatures and concentrations. Compare the data from different sources and materials in a convenient format.

  3. material in/sec m/sec acrylic 120000 3048.00 aluminum 17st 245600 6238.24 aluminum 2024 252200 6405.88 aluminum 250 250000 6350.00 brass 150800 3830.32 brass (naval) 174000 4419.60 brass (yellow) 165800 4211.32 bronze, phosphor 137800 3500.12 copper 183900 4671.06 cu/ni 80/20 194000 4927.60 duplex 2205 220472 5599.99 hastaloy 244000 6197.60 incoloy 899 290400 7376.16 inconel 224400 5699.76

  4. Ultrasonic velocity is directly connected to the elastic moduli and the density of a solid material. By analyzing ultrasonic shear and longitudinal wave velocities, the Young?s modulus and shear modulus can be determined and by this the Poisson ratio.

  5. For the appropriate choice of ultrasonic wave with suitable frequency and intensity, the knowledge of some essential parameters related to transducer is important. The characteristic parameters of ultrasonic wave are: 1. Sound Field (Near field and far field): The sound field of a transducer is divided in two

  6. b. Frequency, Period and Wavelength. Ultrasonic vibrations travel in the form of a wave, similar to the way light travels. However, unlike light waves, which can travel in a vacuum (empty space), ultrasound requires an elastic medium such as a liquid or a solid.

  7. Table of Ultrasonic Properties Material Velocity: Longitudinal Velocity: Shear Velocity: Surface Acoustic Impedance cm/msec in/msec cm/msec in/msec cm/msec in/msec Gm/cm2-sec (x 105) Air (20ºC) .0343 .0135 Alcohol, Ethyl .118 .0465 .789 .930 Alcohol, Isopropyl .117 .0461 .786 .919

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