Fiber-bundle-based 2D Raman and Rayleigh imaging for major species and temperature measurement in laminar flames

Abstract

In this Letter, we introduce a novel fiber-bundle-based 2D Raman and Rayleigh imaging system for 2D measurements of major species mole fractions and temperature in flames. A cascade of dichroic mirrors and bandpass filters separate the Raman signal associated with each major species and direct it to a custom-built four-inputs/one-output fiber bundle. The single output of the fiber bundle allows simultaneous detection of four species by using a single back-illuminated CCD camera. The novel imaging system combined with a pulse-burst laser operated at 10 kHz and a 10 kHz optical shutter is characterized from measurements in a Mckenna burner and then applied to a flame stabilized over a Santoro burner. The work is, to the best of our knowledge, the first demonstration of 2D measurements of temperature and major species (i.e., N2, O2, H2, and H2O) in H2–air diffusion flames at atmospheric pressure.

Effect of Annealing on PL Intensity of NaYF4:Er3+, Yb3+/Ca2+ Phosphor and the Application to Temperature Sensor

“…The investigation of the method and materials for temperature measurement with excellent performance is still a hot topic because of its comprehensive application in various fields [1][2][3][4][5][6][7]. Especially in the last two decades, the optical sensing technique of measuring high temperature based on the florescence intensity ratio (FIR) of the photoluminescence (PL) intensities resulting from the emission of material-doped rare earth ion (REI) has attracted increasing attention due to its wide dynamic range, high sensitivity, almost perfect antiinterference ability, and so on [8][9][10][11][12][13][14][15][16].…”