Burst-mode 100 kHz N2 ps-CARS flame thermometry with concurrent nonresonant background referencing
Abstract
A burst-mode nitrogen ( N 2 ) 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 c m − 1 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 C H 4 / a i r Hencken calibration flame with an accuracy of 1.5% and precision of 4.7% up to peak flame temperatures. The use of N 2 VCARS and simultaneous NRB measurements enables high-speed thermometry for a wide range of fuels and combustion applications.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 29, 2021
- Source ID
- 10.1364/ol.439996
Entities
People
- Daniel K. Lauriola
- Mikhail N Slipchenko
- Naibo Jiang
- Paul Hsu
- Sukesh Roy
- Terrence R Meyer
Organizations
- Purdue University
- United States Air Force