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 microscope image of an implemented double cavity FPI fiber sensor, and (b) its reflection spectrum [38]. The length of HOF is ∼70 μm, and the length of MMF is ∼360 μm. SMF; single mode fiber, HOF; hollow optical fiber, MMF; multi mode fiber.
