Annular phase-matched dual-pump coherent anti-stokes Raman spectroscopy system for the simultaneous detection of nitrogen and methane.

摘要: The concentration and pressure dependence of dual-pump coherent anti-Stokes Raman spectroscopy (CARS) signals from nitrogen methane was investigated. CARS spectra were acquired a gas cell at pressures 0.007 to 2.24 MPa concentrations 0.5 50%. square root the signal intensity divided by found have near-linear on all this integrated ratio decreased with increasing became negligible highest tested. shot-to-shot variation determined single-laser-shot measurements less than 7%. Single-laser-shot obtained cylinder firing direct-injection natural engine.