Instrumentation for time-resolved measurement of ultrasound velocity deviation

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...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 1989-08, Vol.38 (4), p.913-916
Main Authors: Anderson, W.L., Jensen, C.E.
Format: Article
Language:English
Subjects:
Acoustical measurements and instrumentation
Acoustics
Exact sciences and technology
Frequency conversion
Frequency measurement
Fundamental areas of phenomenology (including applications)
Instruments
Phase locked loops
Physics
Pulse measurements
Sampling methods
Ultrasonic imaging
Ultrasonic variables measurement
Velocity measurement
Voltage-controlled oscillators
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Description
Summary: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 10/sup 6/; 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/sup 5/.< >
ISSN:0018-9456
1557-9662
DOI:10.1109/19.31013