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Linearly excited indium fluorescence imaging for temporally resolved high-precision flame thermometry

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Abstract

Two-line atomic fluorescence (TLAF) is a promising technique for two-dimensional (2D) flame thermometry. However, it suffers either from a low signal-to-noise ratio (SNR) when excited in the linear regime or a quenching effect and nonlinear behavior in the nonlinear regime. This work aims to develop a new TLAF modality, which can overcome the aforementioned limitations based on a specifically designed laser source that can generate long pulses (${\sim}{400}\;{\rm ns}$) with a moderate energy of ${\sim}{0.9}\;\unicode{x00B5} {\rm J}$ and operate at a repetition rate up to ${\sim}{22}\;{\rm kHz}$. A proof-of-concept experiment was conducted and linearly excited fluorescence images with an SNR up to ${\sim}{14}$ were obtained within 1 ms acquisition time by synchronizing the laser with the microchannel plate (MCP) of a 10 Hz-rate intensified camera. The SNR achieved was comparable to that of a traditional nonlinear TLAF implementation and superior to a conventional linear TLAF approach. This approach offers a novel solution for recording linearly excited indium fluorescence images and is expected to make TLAF a temporally resolved and high-precision 2D thermometry for the first time.

© 2020 Optical Society of America

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