Four-frame gated optical imager with 120-ps resolution

Conference · Tue Aug 11 04:00:00 EDT 1987

OSTI ID:6781847

Young, P E; Hares, J D; Kilkenny, J D; Phillion, D W; Campbell, E M

In this paper we describe a framing camera capable of four separate two-dimensional images with each frame having a 120-ps gate width. The time separation between frames can be selected arbitrarily. Fast gating of a single frame is accomplished by using a standard wafer image intensifier tube in which the cathode is capacitively coupled to a conducting mesh placed over the input window of the tube. The mesh is then pulsed relative to the microchannel plate by a narrow (120 ps), high-voltage pulse. The transmission of the tube as a function of time has been verified using a laser-diode pulser and is approximately Gaussian with a FWHM of 120 ps. Multiple frames are obtained using multiple gated tubes which can then share a single bias supply and pulser with relative gate times selected by the cable lengths between the tubes and the pulser. A beamsplitter system has been constructed which produces a separate image for each tube from a single scene. In the present system, the tubes use S-20 photocathodes with an 18 mm diameter and quartz input windows. Spatial resolution is unchanged between d.c. and fast gated operations and has been measured to 10 lp/mm. Applications to time-dependent behavior in laser-produced plasmas will be presented. 7 figs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6781847
• Report Number(s): UCRL-97226; CONF-8708110-42; ON: DE89005659
• Country of Publication: United States
• Language: English

Related Subjects

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47 OTHER INSTRUMENTATION
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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CAMERAS
DIAGNOSTIC TECHNIQUES
IMAGE INTENSIFIERS
LASER-PRODUCED PLASMA
MEASURING INSTRUMENTS
PLASMA
PLASMA DIAGNOSTICS
RESOLUTION
SPATIAL RESOLUTION