Title :
Instrumentation for time-resolved measurement of ultrasound velocity deviation
Author :
Anderson, Wallace L. ; Jensen, Charles E.
Author_Institution :
Dept. of Electr. Eng., Houston Univ., TX, USA
fDate :
8/1/1989 12:00:00 AM
Abstract :
An inexpensive digital data acquisition unit is described which has the capability to record ultrasound velocity variations up to 20 m/s in ultrasound velocity at rates up to 1000 readings per second. No calibration procedures are required. The intrinsic velocity resolution of the unit is less than 1 part in 106; however, the short-term frequency instability of the phase-locked loop instrument used as a velocity sensor limits the overall resolution to 1 part in 10 5
Keywords :
data acquisition; digital instrumentation; frequency stability; phase-locked loops; ultrasonic velocity measurement; digital data acquisition; digital instrumentation; frequency instability; phase-locked loop instrument; time-resolved measurement; ultrasound velocity deviation; velocity sensor; Frequency conversion; Frequency measurement; Instruments; Phase locked loops; Pulse measurements; Sampling methods; Ultrasonic imaging; Ultrasonic variables measurement; Velocity measurement; Voltage-controlled oscillators;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
