RAM-5000 SNAP system for the Study of Nonlinear Acoustic Phenomena   Characterize materials by measuring nonlinear properties   Examine harmonic frequencies for increased sensitivity in material evaluation   Two Gated Amplifiers provided for a variety of nonlinear measurements such as beam mixing      with the nonlinear generation of sum and difference frequencies   RF Burst Output Power up to 5 kW   Superb Analog Signal Processing   Determination of both signal amplitude and phase for sensitive and accurate measurements      of changes in ultrasonic velocity and attenuation   Unique Design with three direct digital synthesizers for complete flexibility in measurements

In the last few years, considerable attention has been focused on using nonlinear ultrasonic   properties for the nondestructive evaluation of materials. Some examples of important   applications include: metal fatigue, micro cracking, bond strength of adhesives, metal   embrittlement, and properties of coatings. The RITEC SNAP incorporates a number of unique   circuits designed to facilitate the determination of these properties using a variety of techniques:

1. Harmonic generation in the sample can be monitored as a function of the driving sound      amplitude.    2. Acoustic resonances may be examined at high and low amplitudes.    3. Beam mixing at two driving frequencies can be studied using two high-power, gated amplifiers.    4. In some cases simple amplitude dependence may used to obtain valuable results.

Gated-amplifier, high-power outputs are obtainable over a frequency range far in excess of one   decade. Typical high-power (5KW) frequency ranges are 0.05 to 5 MHz and 0.5 to 7 MHz. At 1KW   these ranges are extended to ~5 and just under 20 MHz respectively.   In the SNAP system, however, the superheterodyne receiver may be independently tuned up to   80 MHz without loss of phase coherency.