Title :
Linearity and noise in differential travel time acoustic velocity measurement
Author :
Williams, Albert J.
Author_Institution :
Woods Hole Oceanogr. Instn., MA, USA
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;
Conference_Titel :
Current Measurement, 1995., Proceedings of the IEEE Fifth Working Conference on
Conference_Location :
St. Petersburg, FL
Print_ISBN :
0-7803-2437-4
DOI :
10.1109/CCM.1995.516177
