Fluid density and concentration measurement using noninvasive in situ ultrasonic resonance interferometry
- Los Alamos National Lab., NM (United States)
- Colorado State Univ., Fort Collins, CO (United States)
A method of noninvasively measuring the density of fluids contained within pipes, cans, tanks and bottles has been developed. The container-fluid system is interrogated using an ultrasonic transducer. A second transducer is used to observe transmitted energy as the input frequency is swept through an appropriate range determined by the geometry. Resonance peaks are observed in the transmitted energy. The periodicity of the resonant peaks is determined by analyzing the response data using a fast Fourier transform. The technique was tested using known NaCl concentration standards within a stainless steel pipe. The concentration of unknown NaCl solutions were then measured in situ with an accuracy of {plus_minus}0.15 M over a range of 0.4 to 3.4 M corresponding to an accuracy of {plus_minus}0.02 specific gravity (SG) units over a range of 1.000 to 1.134 SG units. The precision of each measurement ranged from 1 part in 10,000 to 1 part in 1000. Changes in temperature shift the period in a manner similar to shifts from concentration changes; for NaCl solutions the temperature effect can be expressed as an equivalent concentration change and was found to be 0.029 M per {degree}C or 0.59% over the concentration range measured. Data collection time for a single measurement was less than 2 seconds.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10110313
- Report Number(s):
- LA-UR-92-3309; CONF-9210241-1; ON: DE93003741
- Resource Relation:
- Conference: IEEE symposium on ultrasonics,Tucson, AZ (United States),20-23 Oct 1992; Other Information: PBD: [1992]
- Country of Publication:
- United States
- Language:
- English
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Solution density and concentration measurement using noninvasive in situ ultrasonic resonance interferometry
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