Trace gas sensors are used in different fields. Light-induced thermoelastic spectroscopy (LITES) has extremely high sensitivity and offers non-contact measurement, attracting extensive research ...

Current extrinsic fiber acoustic sensors face two primary challenges. The first lies in the time-varying initial phase of the interference signal, which arises from environmental vibrations, ...

a, Using the phase demodulation method, the peak-to-peak values of H-LITES signal were generally consistent, with an average of 55.54° and a standard deviation of 0.64°. The phase demodulation method ...

Norwood, Mass.— Analog Devices Inc. is sampling the AD8339, a quad I/Q demodulator and phase shifter that is says replaces delay lines in medical ultrasound equipment to reduce component count and ...

EDAN F15 Series Used in the Study with Its Own IQ Algorithm Proven to Reduce FHR Doubling and Halving Artifacts in Electronic Fetal Heart Rate Monitoring In comparison between IQ demodlation and ...

Lock-in amplifiers were invented in the 1930s [1, 2, 3] and commercialized [4] in the mid 20 th century as electrical instruments that are capable of extracting signal amplitudes and phases in ...