Patent ID: 6134968
Filing Date: 2000-10-24
Classification: G01N

Abstract:
A portable acoustic impedance data acquisition and processing system for use with a test object, the system comprising:(a) a dynamic signal analyzer for providing audio output test signals;(b) a test head comprising:(i) a compression driver for providing an acoustic signal;(ii) a cylindrical waveguide tube with first and second ends, the first end connected to the compression driver and receiving the acoustic signal, the second end being open; the tube including a side opening near the tube second end;(c) a removable microphone holder attached to the waveguide tube at its side opening and two microphones insertable into the microphone holder; the microphones providing measured signals to the dynamic signal analyzer, the dynamic signal analyzer performing an acoustic analysis of the measured signals and making the results available to an operator;(d) a cylindrical endcap fitting, a mounting disc, and a plug for use in calibrating and adjusting microphone measurements; the endcap fitting including a first end adapted to engage the second end of the waveguide tube and a second end having an opening to hold the mounting disc, the mounting disc adapted to hold the microphones at a longitudinal orientation during calibration; the plug being positionable within the waveguide tube side opening during calibration to prevent the loss of a test signal;(e) an amplifier coupled to the dynamic signal analyzer for amplifying the audio output test signals and providing the amplified signal to the compression driver for use as the acoustic signal; and(f) at least one power supply for providing electrical power to the dynamic signal analyzer, the amplifier, and the two microphones.