Figure 5.
Frequency response of the resonant photoacoustic cell with peaks of different harmonics: 3rd at 3727 Hz, 5th at 6275 Hz, 7th at 8635 Hz. The 3rd harmonic gives the best signal and has a Q-factor of around 12.4.
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.