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.
Waveforms measured by a hydrophone after delivering a 7-MHz sine wave with one cycle (a) and with 20 cycles (b) to each transducer. The maximum magnitude appeared at a depth of 15.2 mm in the case of the press-focused transducer (dotted line) and 10.2 mm in the double-focused transducer (solid line).
