Lauriola Daniel K, Hsu Paul S, Jiang Naibo, Slipchenko Mikhail N, Meyer Terrence R, Roy Sukesh
Opt Lett. 2021 Nov 1;46(21):5489-5492. doi: 10.1364/OL.439996.
A burst-mode nitrogen () picosecond vibrational coherent anti-Stokes Raman scattering (ps-VCARS) system is presented for accurate flame thermometry at 100 kHz repetition rate. A frequency-tripled ps burst-mode laser is used to pump a custom optical parametric generator/amplifier to produce 607 nm broadband Stokes pulses with 120 bandwidth, along with a narrowband 532 nm pump/probe beam. A simultaneous shot-to-shot nonresonant background (NRB) measurement is implemented to account for Stokes spectral profile and beam overlap fluctuations. The 100 kHz ps-VCARS data are benchmarked in a near-adiabatic / Hencken calibration flame with an accuracy of 1.5% and precision of 4.7% up to peak flame temperatures. The use of VCARS and simultaneous NRB measurements enables high-speed thermometry for a wide range of fuels and combustion applications.
本文提出了一种脉冲模式氮气（）皮秒振动相干反斯托克斯拉曼散射（ps-VCARS）系统，用于在100kHz重复频率下进行精确的火焰温度测量。一个三倍频的皮秒脉冲模式激光器用于泵浦一个定制的光学参量发生器/放大器，以产生带宽为120的607nm宽带斯托克斯脉冲，以及一个窄带532nm泵浦/探测光束。实施了同步逐次非共振背景（NRB）测量，以考虑斯托克斯光谱轮廓和光束重叠波动。100kHz的ps-VCARS数据在近绝热/Hencken校准火焰中进行了基准测试，在高达峰值火焰温度时，精度为1.5%，精度为4.7%。使用VCARS和同步NRB测量能够对广泛的燃料和燃烧应用进行高速温度测量。
