G - Physics – 10 – K
Patent
G - Physics
10
K
179/3
G10K 11/22 (2006.01) G10K 5/02 (2006.01) G10K 15/02 (2006.01)
Patent
CA 1207673
Abstract of the Disclosure There is described a system for producing noise particularly for sonic testing of an article, such as a satellite, in a reverberation chamber. In one of its aspects the system comprises a low frequency high-level broad-band noise source; a tube means including a section formed as an acoustic horn connected at its small end to the low frequency source and at its large end to the chamber. A Hartmann-type air acoustic high level noise generator, or generators are located inside the tube at a predetermined position. In operation the generator is excited by the generated low frequency noise to provide an output of non-linearly modulated noise. Also described is a Hartmann-type noise generator which comprises a nozzle and an aligned acoustic tube spaced therefrom by an air gap. A reverberation cup is formed in the mouth of the tube facing the nozzle and a bridge member extends between the nozzle and tube and spans the air gap. Means is provided for varying the depth of the reverberation cup and for adjusting the size of the gap if desired.
439980
Swail Carl P.
Westley Robert
Woolley John H.
National Research Council Of Canada
Smart & Biggar
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