Figure 13.
Surface-wear-related scalogram of (a) R15 sensor, (b) R6 sensor, and (c) wideband sensor.
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.