Some simple, narrow-beam acoustic Doppler velocity meters (ADVMs) measure velocity at a single point in the flow and relate this to the cross-sectional average velocity.
Displacement is the distance traveled by an object (SI unit:meters, m); linear velocity is the rate of change of displacement over time (SI unit: m/s); linear acceleration is the rate of change of linear velocity over time (SI unit: m/s2).
Main Outcome Measures: Five-meter walking velocity, gait pattern, need for spotter intervention, foot position with respect to the base of support of the walker, and subject preference.
Navigation and position reckoning were realized using a magnetic compass, depth gauge, and Doppler velocity meter (DVL).
Since accelerometer networks are more dense than strong motion velocity meter networks, we use accelerometer data in this study.
Flow measurements were taken at all three sites on all sampling dates using a Hach FH950 portable velocity meter (Hach, Loveland, CO, USA).
Similarly, the propagated vibratory information was acquired using a laser Doppler velocity meter [7, 8], microphones [9], accelerometers [10], and PVDF films [11] attached to the finger close to the tip, as well as a microphone [12] on the forearm.
Figure 8 shows temporal variations in the 222Rn concentration measured with a Radon detector; the SGD flux measured with a seepage meter, the wind velocity (a parameter of the physical environment), and salinity levels inside and outside the seepage chamber at the point at which the 222Rn concentration was relatively high (star; location shown in Fig. 1b).
Dorsal aortic and atrioventricular blood velocities were measured with a 20-MHz pulsed-Doppler velocity meter (model 545C-3; Department of Bioengineering, University of Iowa, Iowa City, IA).
Water flow around the corals was measured with a current velocity meter (Swoffer Model 2100, Swoffer Instruments, Inc., Seattle, USA) and ranged between 5 and 10 cm s−1.
