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TJ-II:Fast camera: Difference between revisions
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The camera is located in [[TJ-II:Sectors|sector]] B8, [[TJ-II:Ports|port]] B8TANG, viewing the [[TJ-II:Limiter|limiter]] in sector C3. | The camera is located in [[TJ-II:Sectors|sector]] B8, [[TJ-II:Ports|port]] B8TANG, viewing the [[TJ-II:Limiter|limiter]] in sector C3. | ||
The camera employed at TJ-II is a Photron SA1 camera. | == Camera == | ||
The camera employed at TJ-II is a [http://www.photron.com/ Photron] SA1 camera. | |||
Sampling speed (measured in frames per second, fps) and image size can be selected, but there is a trade-off: | Sampling speed (measured in frames per second, fps) and image size can be selected, but there is a trade-off: | ||
* 3000 fps with 1024 x 1024 pixels (full frame) | * 3000 fps with 1024 x 1024 pixels (full frame) | ||
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* 650000 fps (maximum) with 64 x 16 pixels | * 650000 fps (maximum) with 64 x 16 pixels | ||
The dynamic range of the sensor is 8 bits, and the memory size is 8 GB. | The dynamic range of the sensor is 8 bits, and the memory size is 8 GB. | ||
== Image intensifier == | |||
Incoming photons are converted into electrons on a photocathode. | |||
The emitted electrons are multiplied in a Micro Channel Plates (MCP) element. | |||
These electrons impact on a phosphor screen, stimulating line emission. | |||
The phosphor material is specially selected for its short decay time (which is the main limitation for high speed operation). | |||
A [http://sales.hamamatsu.com/en/home.php Hamamatsu] C9548-03BL series image intensifier is used. | |||
This is a two stage intensifier, including a first GEN II stage with a fast phosphor (P-46) and gain adjustable via the voltage at the MCP, and a second GEN I one (booster) with a fixed gain of 50 and somewhat slower phosphor screen (P-24). Both stages are optically coupled by a Fiber Optic Plate (FOP) which transfers the output signal from the first to the second. | |||
[[File:TJ-II_Fast_camera_diagram.jpg|800px|thumb|center|Schematic diagram of the TJ-II fast camera installation]] | |||
== References == | == References == | ||
<references /> | <references /> | ||