Accession Number:

ADA102705

Title:

Computer Controlled Resonator Measurements with a 12-Liter Pyrex Sphere and a 100-Liter Titanium Sphere.

Descriptive Note:

Technical rept.,

Corporate Author:

CASE WESTERN RESERVE UNIV CLEVELAND OH CASE LABS FOR ELECTROCHEMICAL STUDIES

Report Date:

1981-06-30

Pagination or Media Count:

57.0

Abstract:

A microcomputer controlled spherical resonator apparatus has been developed for acoustic studies of liquids at 5-500 kHz. A programmable frequency synthesizer producing frequencies in steps down to 1 microHz is used as the source. The received signal is fed into a programmable tuned amplifier, and demodulated. AD conversion is made with a high-speed sample-and-hold digital voltmeter via a multiplexing scanner. The system allows for very detailed mode mapping of the sphere by accumulating amplitude data both while the sphere is being driven and after a specified decay time interval, along with recording of temperature. The experimental resonance frequencies have been compared with those predicted theoretically and decay rates of a large number of resonances measured. The amplitude decay can be followed through 70 dB with reproducibility within or - 0.2 dBs under favorable conditions. The system is also used for cylindrical resonators. Author

Subject Categories:

  • Computer Hardware
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE