Fast Imaging Applications in the Nuclear Test Program

Abstract

Applications of fast imaging employ both streak cameras and fast framing techniques. Image intensifier tubes are gated to provide fast two-dimensional shutters of 2-3 ns duration with shatter ratios of greater than 10 6 and resolution greater than 10 4 pixels. Shutters of less than 1 ns have been achieved with experimental lubes. Characteriza tion data demonstrate the importance of tube and pulser design.Streak cameras are used to simultaneously record temporal and intensity information from up to 200 spatial points. Streak cameras are combined with lemote readout fordownhole uses and .-.re coupled to fiber optic cables for uphole uses. Optical wavelength multiplexing is being studied as a means of compressing additional image data onto optical fibers. Performance data demonstrate trade-offs between im age resolution and system sensitivity.

Developments Of Optical Fast-Gated Imaging Systems

“…extensively as optical shutters of fast-framing cameras. [1][2][3][4] MCP intensifies. The MCP intensifier consists of a photocathode (PC), a MCP electron multiplier, and a phosphor screen that constitutes the photon source viewed by the camera.…”

“…Both coaxial termination geometry and microstnp transmission-line geometry are used. 1,4 Photo:! tod* For most high-speed imaging applications, the correlation of optical shutter speed to spatial resolution at a fixed contrast transfer function (CTI : ) must be precisely Tinined.…”

“…The streak camera described in this report was built around the RCA 73435 AK and AJ series tube. 1 This tube is a gated e'ectrostatic-focus, electrostatic-deflection image device that is specifically designed for high-speed light shutters. The image tube has a fiber-optic or glass input window and a fiber-optic output window, a modified S-20 photocathode (allowing extended LTV and IR resoonse), and a P-ll phosphor.…”

“…In the experiment, nuclear radiation is focused through a pinhole onto a plastic fluor. 1 Light from the fluor is then focused onto the camera that digitizes the data and sends them to a memory. These data and the calibration data are processed by computer into a quantized image.…”

Research on fabrication technology of tungsten micro-hole with large aspect ratio based on micro-EDM

“…X-ray imaging is an effective diagnostic means to analyze the internal reaction mechanism in the process of nuclear physics research, and pinhole device is one of the key devices to realize X-ray imaging [1,2]. Figure 1 shows the schematic diagram of the single-pinhole X-ray imaging device.…”