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

Robin Chrystie, Ehson Fawad Nasir, Aamir Farooq

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

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 X = 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% (1u) at an effective time-resolution of 1.0 MHz. Our sensor is applicable to other species, and canbe integrated into commercial technologies.
Original languageEnglish (US)
Pages (from-to)6620
JournalOptics Letters
Volume39
Issue number23
DOIs
StatePublished - Nov 20 2014

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