Parts-per-Billion Detection of Hydrogen Sulfide via Cavity Ring-Down Spectroscopy
Parts-per-Billion Detection of Hydrogen Sulfide via Cavity Ring-Down Spectroscopy
Blog Article
Rapid and precise detection of hydrogen LIQUID B COMPLEX sulfide (H2S) at trace levels is critical for industrial safety and environmental air quality monitoring, yet existing methods often struggle with cost, speed, or sensitivity.A cost-effective cavity ring-down spectroscopy (CRDS) analyzer is presented, incorporating a novel digital locking circuit for sequential laser-cavity mode matching.This system demonstrates rapid and precise hydrogen sulfide (H2S) detection capability at parts-per-billion (ppb) concentration levels.Compared to traditional wavelength meters, our system delivers a 140-fold improvement in frequency interval precision (0.07 MHz, 0.
027% relative uncertainty).Allan variance analysis under vacuum conditions demonstrates a sensitivity limit of 3 × 10−12 cm−1 at a 60-s Dip Powders averaging time.Validated through calibrated gas dilution tests, the analyzer detects a 4 ppb H2S absorption signal with a signal-to-noise ratio (SNR) > 6, establishing a 2 ppb detection limit (3σ criterion).This innovative approach meets stringent industrial and environmental requirements, offering a significant advancement in trace gas-sensing technology.