Stable detection under turbulence
Employs a half-mirror and mixer to extract and correct phase in free space, effectively suppressing phase fluctuations caused by atmospheric turbulence for long-range gas detection.
Tang, Qixing · Liu, Lu · Zhang, Yujun · Rao, Yuan · Liao, Juan · Wang, Yuwei · Gao, Yanwei
IEEE Transactions on Instrumentation and Measurement 2025
Low limit of detection for 5 ppm NH3 is 8 ppb (1σ)
Fluctuation power spectral density suppressed below 20 Hz offset frequency
Phase compensation achieved with half-mirror and mixer