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Title: Fluid density and concentration measurement using noninvasive in situ ultrasonic resonance interferometry

The specific gravity or solute concentration of a process fluid solution located in a selected structure is determined by obtaining a resonance response spectrum of the fluid/structure over a range of frequencies that are outside the response of the structure itself. A fast fourier transform (FFT) of the resonance response spectrum is performed to form a set of FFT values. A peak value for the FFT values is determined, e.g., by curve fitting, to output a process parameter that is functionally related to the specific gravity and solute concentration of the process fluid solution. Calibration curves are required to correlate the peak FFT value over the range of expected specific gravities and solute concentrations in the selected structure.
 [1];  [2];  [1]
  1. (Los Alamos, NM)
  2. (Espanola, NM)
Issue Date:
OSTI Identifier:
Regents of University of California, Office of Technology (Alameda, CA) LANL
Patent Number(s):
US 5359541
Contract Number:
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
fluid; density; concentration; measurement; noninvasive; situ; ultrasonic; resonance; interferometry; specific; gravity; solute; process; solution; located; selected; structure; determined; obtaining; response; spectrum; range; frequencies; outside; fast; fourier; transform; fft; performed; form; set; values; peak; value; curve; fitting; output; parameter; functionally; related; calibration; curves; required; correlate; expected; gravities; concentrations; curve fitting; calibration curve; fluid density; functionally related; specific gravity; fourier transform; process fluid; process parameter; peak value; ultrasonic resonance; solute concentration; calibration curves; concentration measurement; resonance response; response spectrum; fluid solution; fast fourier; situ ultrasonic; specific gravities; curve fit; /702/73/