Fuel Pool: 20 mm diameter

Oxygen Inlet: 25 mm diameter

Equivalence ratio: 0.89

This experiment arose from an interest in transient phenomena which requires high time resolution techniques. Limited optical access makes many conventional laser diagnostics difficult, so a streak camera spectrometer offers high time resolution from a single optical access point.

Optical emission spectroscopy is a non-intrusive measurement technique. The measurement volume is determined by the magnification of the detection optics and the size of the spectrometer slit. The temporal resolution is determined by the exposure time of the camera.

A streak camera is an instrument for very high-speed optical data collection. It has only one dimension of spatial resolution and is commonly coupled with a spectrometer. The raw streak spectra shows OH* emission. It has a low signal to noise ratio for several reasons. On the streak camera image, the distortions at the edges are due to the CCD being larger than the streak tube.

For data processing, the edge effects on the streak image are trimmed. Time averaging is implemented to improve S/N, and the spectra are fit in LIFBASE from SRI International to extract a rotational temperature.

The temperature profile shapes show promising agreement with the thermocouple data. However, improvements to signal and noise ratio are needed to achieve the desired time resolution. In addition, more work is needed to correct for the difference between rotational and translational temperature.