Figure 5.
Measured 2f QEPAS signals with and without mR at a modulation depth of 0.492 cm−1 using QTFs with f0 of 30.72 kHz and 32.768 kHz.
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.