Ultra-fast and calibration-free temperature sensing in the intrapulse mode

R.S.M. Chrystie, E.F. Nasir, A. Farooq
Optics Letters, 39, pp. 6620-6623, (2014)

Ultra-fast and calibration-free temperature sensing in the intrapulse mode

Keywords

Ultra-fast, Intrapulse

Abstract

A simultaneously time-resolved and calibration-free sensor has been demonstrated to measure temperature at the nanosecond timescale at repetition rates of 1.0 MHz. The sensor benefits from relying on a single laser, is intuitive and straightforward to implement, and can sweep across spectral ranges in excess of 1  cm⁻¹. The sensor can fully resolve rovibrational features of the CO molecule, native to combustion environments, in the mid-infrared range near λ=4.85  μm at typical combustion temperatures (800-2500 K) and pressures (1-3 atm). All of this is possible through the exploitation of chirp in a quantum cascade laser, operating at a duty cycle of 50%, and by using high bandwidth (500 MHz) photodetection. Here, we showcase uncluttered, spectrally-pure Voigt profile fitting with accompanying peak SNRs of 150, resulting in a typical temperature precision of 0.9% (1σ) at an effective time-resolution of 1.0 MHz. Our sensor is applicable to other species, and can be integrated into commercial technologies.

Code

DOI: 10.1364/OL.39.006620

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