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Optical Facilities

Optical Engine with Camera

Optical engine and camera (foreground) being used for planar laser-induced fluorescence measurements.

The Engine Research Center has a wide array of optical facilities that enable either in-cylinder or chamber measurements of numerous quantities, as listed below:

Gas Properties Liquid Properties Particulate Properties
temperature size size
composition concentration concentration
velocity velocity velocity

These measurements are enabled by various laser systems operating in the 200 5000 nm range, including:

  • high-energy pulsed lasers
  • swept-wavelength sources
  • superluminescent sources

Various cameras are available for acquiring optical data:

  • kHz frame rate CMOS cameras
  • kHz frame rate line-scan cameras
  • intensified CCD cameras
  • slow-scan CCD cameras

This hardware allows measurements over a wide dynamic range of signal and acquisition rate.

The techniques used to make the measurements include: laser diffraction, phase Doppler analysis, planar laser-induced fluorescence (PLIF), particle image velocimetry (PIV), Mie scattering, Fourier-transform infrared (FTIR) spectroscopy, and hyperspectral absorption tomography.