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Topic: Exploding-bridgewire detonator

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Blasting cap - Wikipedia, the free encyclopedia Explosive bridgewire or EBW detonators use a higher voltage electric charge and a very thin bridge wire (1mm long, 0.04 mm diameter). Some similar detonators use a thin metal foil instead of a wire, but operate in the same manner as true bridgewire detonators. Slappers, instead of directly using the exploding foil to detonate the initiator explosive, use the electrical vapoization of the foil to drive a small circle of insulating material such as mylar or kapon down a circular hole in an additional disc of insulating material. en.wikipedia.org /wiki/Blasting_cap   (1332 words)

Alternating current activated firing circuit for EBW detonators - Patent 5533454 The invention is a firing circuit for an exploding bridgewire explosive detonator which is activated only by application of an alternating current of a preselected frequency. EBW detonators are insensitive to mechanical impact and are immune to accidental firing caused by spurious electromagnetic (EM) radiation and stray voltages. An EBW detonator is typically activated by a specialized firing circuit, which should be capable of discharging a detonating current of about 1500 volts and 800 amperes in a time of about 1 microsecond. www.freepatentsonline.com:9003 /5533454.html   (2160 words)

Exploding-bridgewire Detonator Information - Articles Free The exploding-bridgewire detonator (EBW, also known as exploding wire detonator) was invented by Luis Alvarez and Lawrence Johnson for the Fat Man-type bombs of the Manhattan Project, during their work in Los Alamos National Laboratory. Given a sufficiently high and well known known amount of electrical current and voltage, the timing of the bridgewire vaporization is both extremely short (a few microseconds) and extremely precise and predictable (standard deviation of time to detonate as low as a few hundredths of a microsecond). The EBW and the slapper detonator are the safest known types of detonators, as only very high-current fast-rise pulse can successfully trigger them. www.articlesfree.com /index.php?title=Exploding-bridgewire_detonator   (693 words)

www.risi-usa.com: td In an exploding bridgewire detonator, the explosive is pressed in two increments of different density with both increments consisting of a secondary type explosive. The basic circuit for exploding a wire is shown in Figure 3, and consists of: A power supply to charge a capacitor, a capacitor for storage of electrical energy, a spark gap or trigger switch to discharge the capacitor across the bridgewire, a transmission line to the bridgewire and a bridgewire. EXPLODING BRIDGEWIRE CONCEPT: The difference between an exploding bridgewire and a bridgewire used in a low energy electric primer, does not necessarily lie in the physical shape or material of the wire. www.risi-usa.com /0products/8td/page03.html   (694 words)

www.risi-usa.com: td Secondary explosives are used in an exploding bridgewire detonator for the initial pressing and output pellet. Therefore, functional differences between a low energy and an EBW detonator are such that a low energy detonator requires only heating of the bridgewire whereas an EBW detonator requires exploding of the bridgewire. In an EBW detonator the explosive next to the bridgewire is a secondary explosive pressed to approximately 50% crystal density. www.risi-usa.com /0products/8td/page04.html   (714 words)

Modular detonator device - Patent 4616565 A first electrical contact is disposed on the base and is coupled through an exploding bridgewire and the coupler to the case, where the external wall of the case comprises a second electrical contact of the device. 2, detonator device 30 comprises a molded header 32, wherein bridgewire 36 is electrically connected between electrically conductive casing 42 and electrically conductive pin 34. During this mating process, in a preferred embodiment, bridgewire 100, being attached at one leg thereof to projection 92 as described earlier, is also projected into through-hole 84, where the unconnected leg of bridgewire 100 is caused to extend into recess 86 defined within coupler 80. www.freepatentsonline.com /4616565.html   (3232 words)

58228.981223&ELEMENT_SET=DECL In the il- lustrated embodiment, the delay detonator 200 is coupled to a non-electric initiation signal means that comprises, in the illustrated case, a shock tube 210, booster charge 220 and transducer module 158. The detonator may be equipped with an externally accessible programming interface so that the timer circuit may be programmed with a delay after the detonator is constructed. In a typical embodiment, detonator delay circuit 10 is assembled into two ma- jor components, a triggering portion 18 and a delay portion 28, both of which com- prise constituent circuits. www.wipo.int /cgi-pct/guest/getbykey5?KEY=98/58228.981223&ELEMENT_SET=DECL   (9534 words)

AIAA 96-2874 Development and Qualification Testing of the High Voltage Detonator Table 1 is due to the large variation in the bridgewire lengths in the test devices. Rather than create a new detonator design, an impossible task within the time allowed, the method chosen to meet this critical objective was to take an established design, the High Voltage Initiator (HVI) developed for a Navy application, and perform the minimum modifications required to turn it into a High Voltage Detonator (HVD). Neyer 1995v) described the advantages of using the VISAR to determine the output of detonators. neyersoftware.com /Papers/AIAA96/HVD.htm   (6512 words)

EBA&D Aerospace An Exploding Bridgewire (EBW) Detonator is used to initiate a secondary explosive charge when a high voltage/ high current pulse is applied across a metallic bridgewire. While similar in construction to the more standard HBW detonator, EBW detonators utilize all secondary explosives to ensure safety and virtually eliminate the possibility for inadvertent initiation. These devices are noted for their high level of inherent safety as well as their rapid and repeatable function time. www.lshd.com /client/ebad/aerospace/exploding_bridgewire.php   (81 words)

Fat Man Information - Articles Free Numerous detonators located on the surface of the high explosive were fired simultaneously to produce a powerful inward pressure on the core, squeezing it and increasing its density, resulting in a supercritical condition and a nuclear explosion. The Soviet Union's first nuclear weapon detonated at Operation First Lightning (known as "Joe-1" in the West) was more or less a purposeful copy of the "Fat Man" device, on which they had obtained detailed information from the spy Klaus Fuchs. Immediately after the bombings of Japan, the United States produced a technical history of the Manhattan Project, known as the Smyth Report, that did not disclose the information that the "Fat Man" device was different from the "Little Boy" device, and did not imply that a different method was required for plutonium weapons. www.articlesfree.com /index.php?title=Fat_Man   (1035 words)

S-IVB Stage A safety and arming device prevents inadvertent, initiation of the explosive train by providing a positive isolation of the EBW detonator and explosive train until arming is commanded. Once detonated, the explosive force of the MDF occurs at a rate of 23,000 feet per second. A CDF; detonated by the safety and arming device, explodes a flexible linear-shaped charge which cuts through the tank skin to disperse both fuel and oxidizer. www.apollosaturn.com /sibnews/sec5.htm   (4808 words)

EBA&D Aerospace This conversion is frequently performed using a Hot Bridgewire (HBW) squib or detonator. The common component in these devices is the bridgewire, a thin metallic wire used to convert electrical current into heat, causing subsequent initiation of a pyrotechnic or explosive charge. Explosive events often require the conversion of an electric signal to an energetic output. www.lshd.com /client/ebad/aerospace/hot_brigewire.php   (88 words)

Teledyne Reynolds Ltd - High Voltage Connectors, High Voltage Cable Assemblies, High Voltage Wire, High Voltage Cable, High Voltage Capacitors The SQ-80 is a thermite filled Exploding Bridgewire ignitor possessing all the safety characteristics of an Exploding Bridgewire Detonator. The RP-2 is a high precision EBW which features close tolerance electrode spacing, precise bridgewire attachment, high quality loading sleeves and a rigidly control crystalization process of the PETN explosive and loading operation. The result is a detonator with a transmission line simultaneity standard deviation of less than 0.035 uS. www.teledynereynolds.co.uk /electronics_ebw.asp   (317 words)

ArmsLocker Forums - Who says full auto is a bad thing? Most of the detonators I use are from RISI in California, http://www.risi-usa.com/ they have an exploding bridgewire detonator that requires 4,000 volts to intiate it. We use the RISI detonators, a significant majority of the the RP-83 for the built in safety factor and the ease at attaching data recording equipment. As for normal blasting caps, when we use them it is generally a #12 electric or #12 non electric blasting cap. www.armslocker.com /forums/showthread.php?t=29790   (675 words)

detonator - OneLook Dictionary Search Phrases that include detonator: delay detonator, electric detonator, exploding-bridgewire detonator, exploding bridgewire detonator, instantaneous detonator, more... Words similar to detonator: cap, detonating device, fuze, more... DETONATOR : Navajo Code Talkers' Dictionary [home, info] www.onelook.com /?w=detonator&ls=a   (253 words)

About Products and Services EFI is similar to EBW except that an exploding foil bridge is used to accelerate a flyer down the barrel to impact an insensitive secondary explosive. Its function is to preclude premature arming and consequent initiation of the detonator during transportation, handling, pre-launch and launch conditions. LID & LI Laser detonators & laser initiators are used with our Laser firing units and fiber optic cable assemblies. www.hstc.com /aboutprods.html   (750 words)

Johnston Oral History That was my project, and I hold the patents on that type of detonator known as the exploding bridgewire detonator. We went through the story step-by-step, of my going to Los Alamos, of being assigned the job of inventing the kind of detonators required for the "Fat Man," of flying with the bombing mission, and finally taking out the patents on the "exploding Bridgewire" detonator. The project I worked on was the detonators for the high explosive shell. www.ieee.org /organizations/history_center/oral_histories/transcripts/johnston.html   (7354 words)

EBA&D Aerospace A Shock Tube Assembly (STA) is a flexible explosive transfer assembly used to propagate an energetic signal and to explosively initiate devices. A Low Energy (LE) endtip is also available, which can be initiated by high-pressure, high-temperature gas instead of a high-energy detonating output, allowing the engineer greater flexibility in optimizing system designs. STA's were developed to directly replace or work in conjunction with Flexible Confined Detonating Cord Assemblies (FCDCA) and Shielded Mild Detonating Cords (SMDC). www.ebco-aerospace.com /aerospace/shock_tube_assembly.php   (155 words)

EBA&D Aerospace In addition to the standard, low voltage Hot Bridgewire (HBW) initiators, EBA&D can provide both Exploding Bridgewire (EBW) and Semiconductor Bridge (SCB) initiators offering greater resistance to RF/EMI as well as more exact timing of the ordnance function. EBA&D initiators can be tuned to offer unique performance and system safety characteristics. EBA&D can integrate any of these initiators with customer or EBA&D supplied devices to perform various functions required by the application. www.ebco-aerospace.com /aerospace/system_init_over.php   (517 words)

Completion Systems - Perforating Systems - Guardian System By incorporating a specially designed downhole firing circuit and exploding bridgewire (EBW) detonator in the perforating system, the Guardian system has raised perforating operations to a new level of safety assurance. The Guardian system protects against accidental firing of perforating guns caused by a wide range of stray voltage sources such as radio frequency (RF) systems, welding equipment, and lightning. www.bakerhughes.com /bakeratlas/completion/perforating_guardian.htm   (161 words)

Dimethylaniline for Tetryl? - Archive File - The Explosives and Weapons Forum posted 05-29-2001 03:51 PM NG and EGDN could be set off by flash, or an exploding bridgewire detonator (no primary, a huge electrical current heats up and vapourises a metal wire, causing a shock wave and temperature rise). I won't bring the discuss about if flashpowder detonates, up again, but I just wanna know if there are any relatively sensitive sec. Probably any highly nitrated nitro-ester (NG, EGDN, MHN etc., but not something like mononitrobutanol where the number of nitrate groups per C atom is low) would be detonated when confined with a charge of good flash. www.roguesci.org /theforum/showthread.php?t=2373   (1072 words)

US Patent Class 102-- AMMUNITION AND EXPLOSIVES .~ Holders for fuse or fuse cord to blasting cartridge, igniting device, or detonator .~.~ Shaped charge or charge with detonation wave cavity modifier www.patentec.com /data/class/102.html   (274 words)

FIRESETS - Explosive Test Site Range Instrumentation - Capacitive Discharge Units and Electronic Detonator Units consist of circuitry to charge a capacitor to a high voltage, then to switch the energy in that capacitor into a low impedance load, typically an exploding bridgewire, foil, or the like, at the end of a transmission line. CDU’s can be configured as single-point or multiple-point outputs, the latter for applications where simultaneous high voltage, high current pulses are required. Numerous specialized interfaces, signal conditioners, etc., utilizing both copper and fiber-optic inputs and outputs. www.cal-av.com /test-range.html   (464 words)

Tentative Program IPS2004 - 31st International Seminar "Exploding Bridgewire Initiation Characteristics of Several High Explosives" "A Study on the Factors Affecting the Firing Sensitivity of Exploding Foil Initiator" "A Numerical Study of Detonation Initiation by Reflected Shock Using a Two-Step Chemical Kinetics" ipsusa.org /program.htm   (1359 words)

IPS2002 - Titles and Authors Mechanism of Exploding Bridgewire and Direct Laser Initiation of Low-Density PETN Development of Pin Type Slapper Detonator for In-Line Fuzing Applications Some Simplified Approaches to the Estimation of the Heat of Formation and Detonation Properties of Energetic Materials ipsusa.org /session.htm   (1181 words)

36th International Annual Conference of ICT - Program QinetiQ Ltd., Sevenoaks, GB Initiation Characteristics of a Laser Driven Exploding Bridgewire Detonator Technion -- Israel Institute of Technology, Haifa, IL Micro-Ejecta from Detonation Front as an Ignored Negative Factor in Performance of PBX Detonation www.ict.fhg.de /english/events/anconf/a36prog.html   (626 words)

Technical Information Database - ISEE Proceedings/Abstracts THE EXPLODING BRIDGEWIRE DETONATOR - A SAFER EXPLOSIVE INITIATION METHOD WAVE PROPAGATION IN A SUBSURFACE ENVIRONMENT DUE TO BLASTING OPERATIONS MINE PLANNING - ITS EFFECT ON DRILLING AND BLASTING www.isee.org /tis/Proceed/General/81gen/81genlist.htm   (194 words)

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