A phase comparison technique for sound velocity measurement in strongly dissipative liquids under pressure
Résumé
An accurate technique for the sound velocity measurement in strongly dissipative liquids is elaborated. This technique is based upon high sensitive phase detection. Each medium, at a given temperature and pressure, is characterized by a specific phase shift due to the propagation of the ultrasonic wave within the analyzed medium. By tuning the insonation frequency of the ultrasonic signal, a succession of consecutive nulls of the output dc voltage generated by the phase detector is observed. Thus from the obtained series of frequency values, the sound velocity is computed. Numerous organic liquids, such as alcohols and alkanes, have been used to validate this experimental procedure. As the developed method is well suited for the sound velocity measurement in strongly dissipative liquids, measurements of compressional wave velocity in heavy oil are also carried out over the temperature range 10 °C to 50 °C. The experimental results agree well with those found in the literature. The accuracy of the developed method is estimated at about ±0.3%.
Mots clés
reproducibility
theoretical model
time
ultrasound MeSH: Alcohols
Alkanes
Humans
Models
Theoretical
Motion
Oils
Pressure
Reproducibility of Results
Sound
Temperature
Time Factors
Ultrasonics Medline is the source for the MeSH terms of this document.
Ultrasonics Medline is the source for the MeSH terms of this document
Compressional wave velocity
Experimental procedure
Heavy oil
Insonation
Organic liquid
Output DC voltage
Phase comparison
Phase detection
Phase detectors
Sound velocities
Sound velocity measurement
Temperature range
Ultrasonic signals Engineering controlled terms: Acoustic variables measurement
Acoustic wave velocity
Antenna phased arrays
Paraffins
Ultrasonic applications
Ultrasonics
Velocimeters
Wave propagation Engineering main heading: Velocity measurement EMTREE drug terms: alcohol derivative
alkane
oil EMTREE medical terms: article
chemistry
comparative study
human