Focusing of an N Wave by a Spherical Mirror.
TEXAS UNIV AUSTIN APPLIED RESEARCH LABS
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An experimental and theoretical study of N-wave focusing has been carried out. An N-wave source electric spark was located on the principal axis of a spherical mirror so as to produce a focus image point beyond the center of curvature. The signals before, at, and beyond the focus were received by a wideband condenser microphone of our own manufacture. Linear theory in the form of the Kirchhoff integral was used to obtain predicted waveforms. Corrections for known nonlinear propagation effects were applied. The data are explained adequately by the composite theory. An analysis of the frequency response of the wideband condenser microphone is included. Author Modified Abstract