The Acoustic Resonance Spectrometer |
The ACRS
measures the acoustic spectrum of a fluid bound in a cylindrical cavity when
stimulated by piezoelectric acoustics. This state-of-the-art measurement technique obtains
unusually high resolution over a wide range of operating conditions. A typical operating
range is 100-700 K and 1.3 x 106 mm Hg within an accuracy of +/-0.001 K for
temperature and within +/-0.02% for
pressure. By coupling new pressure,
temperature, and density measurement capabilities with existing acoustic resonance
measurements, the unit may be useful for measuring physical properties and tracking time
dependent phenomena. ORNL is testing the modified ACRS to determine its capability
for measuring/deriving:
 Vapor-liquid equilibrium
Dew and bubble
points
Phase boundary
transitions
Density
Critical points
Solubilities
Heat capacity
of gas
Virial
coefficients
Diffusion
coefficients
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