Patent ID: 6439053
Filing Date: 2002-08-27
Classification: G01N

Abstract:
An acoustic spectrometer for testing the geometry of a cavity within a cast, molded or machined part, said cavity having openings at two ends, comprising:a) airtight seals covering said openings in said cavity; b) an acoustic transmitter means in acoustic communication with a first end of said cavity, said acoustic transmitter transmitting an acoustic wave into said cavity; c) an acoustic receiver at a second end of said cavity, in acoustic communication with said cavity for receiving said acoustic wave conducted through said cavity and producing a received signal responsive to said acoustic wave; d) a variable frequency generator operatively connected to said acoustic transmitter whereby a generated signal is transformed into an acoustic wave by said acoustic transmitter; e) an amplitude detector responsive to said received signal producing an amplitude signal; f) a control means controlling the frequency of said variable frequency generator to a multiplicity of predetermined frequencies, said control means also responsive to said amplitude signal, producing an acoustic amplitude spectrum; and g) a means to compare said acoustic amplitude spectrum with an acoustic amplitude spectrum produced from a corresponding cavity in a similar part having known properties as reference spectrum.