Editing Bunker buster (section)

== Fuzing ==
The traditional [[fuze]] is the same as a classic [[armor-piercing bomb]]: a combination of timer and a sturdy dynamic propeller on the rear of the bomb. The fuze is armed when the bomb is released, and detonates when the propeller stops turning and the timer has expired.

Modern bunker busters may use a traditional fuze, but some also include a [[microphone]] and [[microcontroller]]. The microphone listens, and the microcontroller counts the number of floors until the bomb breaks through the desired numbers of floors.
Northrop Grumman is working on the Hard Target Void Sensing Fuze (HTVSF), an electronic and cockpit programmable fuze capable of destroying deeply buried and targets. It provides multiple delay arming and detonation times, as well as a void-sensing capability, which allows for precision activation of the fuze for {{convert|2000|and|5000|lb|kg|adj=on}} weapons to explode when they reach an open space in a deeply buried bunker.<ref>{{cite web |url=http://www.globalsecurity.org/military/library/news/2011/04/mil-110405-atk01.htm |title=ATK Awarded Contract for Hard Target Void Sensing Fuze (HTVSF) Engineering & Manufacturing Development (EMD) Phase |work=ATK |date=5 April 2011 }}</ref>
<ref>{{cite web |url=https://news.northropgrumman.com/news/releases/northrop-grumman-awarded-110-million-for-us-air-force-hard-target-void-sensing-fuze |title=Northrop Grumman Awarded $110 Million for US Air Force Hard Target Void Sensing Fuze |website=Northrop Grumman Newsroom |date=February 28, 2020 |archive-url=https://web.archive.org/web/20200303153124/https://news.northropgrumman.com/news/releases/northrop-grumman-awarded-110-million-for-us-air-force-hard-target-void-sensing-fuze |archive-date=March 3, 2020 |url-status=dead }}</ref>