Preamplifier circuit noise is of great importance in quartz enhanced photoacoustic spectroscopy (QEPAS) system.In this paper,several noise sources are evaluated
A short cavity distributed feedback (DFB) fiber laser is used for low frequency acoustic signal detection.Three DFB fiber lasers with different central waveleng
The polymer waveguide optical biosensor based on the Mach-Zehnder interferometer (MZI) by using spectral splitting effect is investigated.The MZI based biosenso
An in-line fiber Fabry-Perot interferometer (FPI) based on the hollow-core photonic crystal fiber (HCPCF) for refractive index (RI) measurement is proposed in t