Phred Petersen
Camp stove, 2008

High-speed Schlieren Photograph; direct capture onto 8 x 10 Ilford HP 5 film using Broncolor Grafit 2 flash equipment; flash duration of approximately 250 microseconds (1/4000 sec).

RMIT University, Melbourne, Australia

Using a schlieren imaging system, the heat produced from a gas-fueled backpacking stove rises around a small cooking pan becomes visible. In this photograph, a slit light source was used in a Z-type schlieren arrangement which incorporated two 300mm f/10 mirrors. Schlieren are inhomogeneities in transparent material and are not visible to the human eye. They may be characterized as differences in optical path lengths that cause energy travel to be deviated. This deviation is observed as shadows in a schlieren system. A stop was used to the control sensitivity of the system. The image was recorded at a life size because the system had no lens and both the subject and the film plane were located six meters from the second schlieren mirror. An electronic flash with a flash duration of approximately 250 microseconds was used to freeze the high-speed event.

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