14We demonstrate the first frequency comb laser absorption spectroscopy in an industrial environment. 15 Recent advancements in robust frequency comb design enable installation of the sensor in an operating 16 power plant, where we simultaneously measured temperature, H 2 O and CO 2 concentration in the exhaust 17 of a 16MW stationary gas turbine. The frequency comb laser spectrometer probed 16,000 individual 18 wavelengths of light spaced by 0.007cm -1 (0.0014nm) near 1440nm, spanning 279 absorption features of 19 H 2 O and 43 features of CO 2 . Fits to the measured absorption spectra yield simultaneous temperature, 20 H 2 O and CO 2 concentrations with between 10 and 60 second time resolution. Measurements over a 5 21 hour period tracked variations in the exhaust consistent with various changes to the gas turbine operation. 22 Much larger wavelength ranges (200+ nm) and different time resolutions are possible depending on the 23 desired precision by changing various settings on the same spectrometer. Overall, this work 24 demonstrates the potential for frequency comb laser absorption spectroscopy in industrial combustion 25 environments. 26
This work details a master oscillator power amplifier (MOPA) microjoule-class pulsed coherent Doppler lidar system configuration designed to measure line-of-sight wind velocities and backscatter intensity of atmospheric aerosols. The instrument is unique in its form factor. It consists of two physically separated modules connected by a 10 m umbilical cable. One module hosts the transceiver, which is composed of the telescope, transmit/receive (T/R) switch, and high-gain optical amplifier, and is housed in a small box (34.3 cm × 34.3 cm × 17.8 cm). The second module contains the data acquisition system and several electro-optical components. This form factor enables deployments on platforms that are otherwise inaccessible by commercial and research instruments of similar design. In this work, optical, electrical, and data acquisition components and configurations of the lidar are detailed and two example deployments are presented. The first deployment describes measurements of a controlled wildfire burn from a small aircraft to measure vertical plume dynamics and fire inflow conditions during summer in Florida. The second presents measurements of the marine boundary layer height and vertical velocity and variance profiles from the Research Vessel (R/V) Thomas Thompson. The new instrument has enabled greater flexibility in field campaigns where previous instruments would have been too costly or space prohibitive to deploy.
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