"double flash" meaning in English

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  "etymology_text": "double + flash",
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      "form": "double flashes",
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          "ref": "2010 May, Norman Dombey, “Double Flash”, in London Review of Books (blog), London: LRB Limited",
          "text": "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.",
          "type": "quotation"
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        {
          "ref": "2015 July, Eileen Patterson, “The Double Flash Meets the Bhangmeter”, in Clay Dillingham, editor, National Security Science, Los Alamos National Laboratory, archived from the original on 2020-11-01, page 12",
          "text": "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.",
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          "ref": "2019 September, William Burr, Avner Cohen, Lars-Erik De Geer, Victor Gilinsky, Sasha Polakow-Suransky, with Sokolski, Henry, Weiss, Leonard, and 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, The Slate Group",
          "text": "The detected signal was a “double flash” characteristic of nuclear test signals recorded on 41 previous occasions by Vela satellites.",
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        "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."
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          "ref": "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, volume 105 (PDF), IOP Publishing Ltd, →DOI, →ISSN",
          "text": "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].",
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        "A system using two flash separators to separate phases of a working fluid."
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          "flash separator",
          "flash separator"
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          "working fluid",
          "working fluid"
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        "(engineering) A system using two flash separators to separate phases of a working fluid."
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  "word": "double flash"
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          "text": "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].",
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        }
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        "(engineering) A system using two flash separators to separate phases of a working fluid."
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