英和和英

名詞

double flash (複数形 double flashes)

1. The characteristic visual phenomenon produced by the atmospheric detonation of a nuclear weapon, consisting of a very brief, bright flash of light which dims rapidly, followed by a second, gradually brightening flash.
   • 2010 May, Dombey, Norman, “Double Flash”, in London Review of Books‎^[1] (blog), London: LRB Limited:

     On 22 September 1979 at about 1 a.m. GMT, a US Vela satellite passing over the South Atlantic detected a double flash of light in the vicinity of Prince Edward Island.

   • 2015 July, Patterson, Eileen, “The Double Flash Meets the Bhangmeter”, in Clay Dillingham, editor, National Security Science‎^[2], Los Alamos National Laboratory, page 12:

     One of the sensors on satellites in the U.S. Nuclear Detonation System uses a relatively simple device to detect the “double flash” of a nuclear detonation anywhere on earth.

   • 2019 September, Burr, William; Cohen, Avner; De Geer, Lars-Erik; Gilinsky, Victor; Polakow-Suransky, Sasha; Sokolski, Henry; Weiss, Leonard; Wright, Christopher, “Blast From the Past”, in Jonathan Tepperman; Ravi Agrawal; Dan Ephron; Cameron Abadi; Sasha Polakow-Suransky; Kathryn Salam; Sarah Wildman; James Palmer; Benjamin Soloway; Nina Goldman, editors, Foreign Policy‎^[3], The Slate Group:

     The detected signal was a “double flash” characteristic of nuclear test signals recorded on 41 previous occasions by Vela satellites.

2. (engineering) A system using two flash separators to separate phases of a working fluid.
   • 2018, A Rachmat; Nasruddin; A S Wibowo; A Surachman, “Exergoeconomic analysis and optimization of a combined double flash–binary cycle for Ulubelu geothermal power plant in Indonesia”, in IOP Conference Series: Earth and Environmental Science‎^[4], volume 105 (PDF), IOP Publishing Ltd, DOI:10.1088/1755-1315/105/1/012087, ISSN 1755-1315:

     Dipippo, in 2008, reported that the double-flash plant increased power output by 15-25% compared to a single flash plant under the same geothermal fluid conditions [9, 10].

Further reading

• Effects of nuclear explosions on Wikipedia.