Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Second experiment to validate the phase measurement method: linear-with-frequency phase shifts resulting from hydrophone displacements by z2 – z1 = 4Δz, Δz, -Δz, and −4Δz where Δz = 25 μm. The slopes of least-squares regression fits of phase shift (Δφ) versus frequency were 0.42, 0.10, −0.09, and −0.43 radians / MHz, which corresponded to measured displacements of 100, 24, −22, and −100 μm. These expected values based on Δz = 25 μm were 100, 25, −25, and −100 μm.
