Linearity and noise in differential travel time acoustic velocity measurement

Author

Williams, Albert J.

Author_Institution

Woods Hole Oceanogr. Instn., MA, USA

fYear

1995

fDate

7-9 Feb 1995

Firstpage

216

Lastpage

219

Abstract

An improved constant current source for the time interval integrator in the differential travel time velocity sensor, BASS (Benthic Acoustic Stress Sensor), has extended the full scale range of velocity over which the measurement of velocity is linear from 100 cm/s to 500 cm/s¹. Slow speed response in the former constant current source introduced non-linearities of 5% to 8% for full scale ranges of 240 cm/s. When corrected, linearity is restored to 1.5% over the entire range. Electronic noise (standard deviation) is less than 0.5% of reading with a minimum noise of 0.3 mm/s equivalent velocity for a 15 cm path length

Keywords

acoustic applications; acoustic devices; flow measurement; flowmeters; oceanographic equipment; oceanographic techniques; sonar; ultrasonic applications; ultrasonic devices; BASS; Benthic Acoustic Stress Sensor; acoustic method; constant current source; electronic noise; electronics; equipment; flow measurement technique; linearity; noise; ocean current dynamics; sea velocity; time interval integrator; travel time acoustic velocity measurement; ultrasonic instrument; velocity sensor; Acoustic measurements; Acoustic noise; Acoustic pulses; Acoustic sensors; Current measurement; Delay lines; Linearity; Sea measurements; Time measurement; Velocity measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Current Measurement, 1995., Proceedings of the IEEE Fifth Working Conference on

Conference_Location

St. Petersburg, FL

Print_ISBN

0-7803-2437-4

Type

conf

DOI

10.1109/CCM.1995.516177

Filename

516177