Accession Number : ADA125286


Title :   Computerized Measurement and Tracking of Acoustical Resonances.


Descriptive Note : Master's thesis,


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Conte,Donald Vincent


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a125286.pdf


Report Date : Dec 1982


Pagination or Media Count : 38


Abstract : A system is described which incorporated a Hewlett-Packard 85 desk-top computer to control a frequency synthesizer and read the output of a lock-in analyzer to measure, display and record the resonant frequencies, amplitudes, and quality factors of several modes of an acoustical resonator. The system is capable of locating, measuring, and tracking the resonant modes as parameters which affect sound speed and attenuation are varied. An algorithm for rapidly fitting good quality measured data to a resonance lineshape is described which determines quality factors to precisions of better than 0.1 percent, amplitudes to better than 0.01 percent and center frequencies to better than 0.1 ppm. Sample output is provided for the lowest three plane-wave modes of an air filled cylindrical resonator in the temperature range of -15 to 25 degrees Celsius. (Author)


Descriptors :   *ACOUSTIC MEASUREMENT , *COMPUTER APPLICATIONS , *ACOUSTIC TRACKING , *ACOUSTIC RESONANCE , ALGORITHMS , DATA PROCESSING , CONTROL , COMPUTERS , THESES , RESONANT FREQUENCY , ACOUSTIC RESONATORS , ACOUSTIC ATTENUATION , ANALYZERS , AMPLITUDE , ACOUSTIC VELOCITY , FREQUENCY SYNTHESIZERS , LINE SPECTRA , CURVE FITTING


Subject Categories : Computer Hardware
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE