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.
Temporal signatures of the PA signals. (a, b) PA signals from a point source detected by a conventional PAM system (a) and PATER (b). The useful signal in (a) lasts approximately 500 ns. PATER records the signal in (b) for 160 μs. (c) Widefield signal recorded using PATER for 160 μs.
