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.
(a) The floor plan of the engine test facility. The black rectangle in the upper left corner is the source of noise, white rectangles are offices, gray rectangles are inactive engines, and dark gray rectangles are floor openings. The locations of static sensors are numbered from 1 to 18. (b) The pathway of the first roving sensor is drawn in open circles. The pathway of the second roving sensor is similar, and thus omitted.
