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Helkir mine
The Helkir is an anti-helicopter mine developed by the Austrian company Hirtenberger.〔http://www.janes.com/articles/Janes-Military-Vehicles-and-Logistics/Hirtenberger-HELKIR-Electronic-Fuze-System-for-Anti-helicopter-Mines-Austria.html〕 It uses an IR sensor and an acoustic sensor to detect airborne targets. Once the mine is armed and ready to engage, the acoustic sensor listens for a valid noise input. This enables the IR sensor which is located coaxially to the warhead. When the IR sensor detects a hot signature, the mine blasts off fragments that can penetrate up to 6 mm of armored steel at 50 meters and 2 mm of mild steel at 150 meters. The mine is active for a period of 1 to 120 days, after which it returns to a safe mode.
Helkir, as well as other mines developed by Hirtenberger, like the APM-1 and the APM-2 anti-personnel directional mines (discontinued in 1994),〔http://www.pmulcahy.com/mines/austrian_mines.html〕 do not appear on the company's current website.〔http://www.hirtenberger.at/〕
==See also==
* Bulgarian anti-helicopter mines
* List of land mines
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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