Bridge wire

Miniature Conductive Mix Detonator. Since conductive mix detonators would have no bridge wire, which is a delicate and expensive step in the manuf of bridge wire detonators, it has been proposed that conductive mix detonators would provide an attractive alternative... 

Initiation by exploding bridge. This subject has been studied extensively by Leopold (Refs 32a, 41 43). He used a smear camera to observe the growth of expln in PETN, and a condenser discharge to explode the bridge wire. 

These bridge wire devices are relatively safe from initiation by direct application of heat and external mechanical influences or from most electrical inputs. They are designed for highly specialized electrical impulses (Ref 13)... 

From the measurements made on the bridge wire, the resistance X of the electrolyte in solution is determined by the relationship given above. Therefore, the conductance of the solution (1 /X) will also be known. The specific conductance, K, of the solution is related to the conductance of the solution thus determined by the equation ... 

Bridge wire. The fine wire in an electric detonator which is heated by the firing current. 

Lag time. In firing electric detonators, the interval between the application of the current and the breaking of the bridge wire (see p. 112). 

Another aspect of the EMI problem for low-temperature experiments is the injection of RF (at megahertz frequencies and up) energy via the wiring into the cryostat. A common RF-induced problem is a heating caused by local telephone broadcasters. RF transmitters often ride in over resistance bridge wirings whose signal are at very low frequencies. 

Detonation by Exploding Bridge-Wires. See under DETONATORS, PRIMERS, etc in Section 3, Part C of this Volume... 

Accdg to Dunkle (Refs 19 20), plasmas come into play in the detonation head and are very important in EBW s (exploding bridge wires) (Ref 18) (See also Addnl Refs A, B, C, D E)... 

Explosive Actuator, Linear. A self-contained power transmitting device designed to convert chemical energy into controlled mechanical force in the form of linear mechanical movement. It is comprised essentially of a piston, propellant chge, electrical bridge wire and contacts enclosed in a housing (Ref 38b, pp 3-4, Actuator, Explosive, Linear)... 

The spray metal" technique was invented in order to obtain good contact between extremely thin and short bridge wires and leads. Such bridges are used in newer type electric primers which are capable of being actuated by an extremely small energy input... 

Zn 83 Si 9.6 parts loaded in a fuze train 0.054 inches long gave a mean delay time of 0.023 sec, while 2) KMnC>4 100, Zn 111 70/30-Tl/Ni alloy 11 parts gave a mean time of 0.062 sec] Ad 112a) R.M. Hillyer R.H.F. Stresau EBW (Exploding Bridge Wire) Initiation of RDX with Fifty Milli-joules , Paper No 5, Electric Initiator Sum-posium, Franklin Institute, Philadelphia,... 

The bridge wire ignites the styphnate, which in turn sets off the base chge (a mixt of B/KNOj pellets and granules) located in the same cavity. The basic elements of this system have been tested separately and proved to be satisfactory Ad 155) L.R. Rothstein et al, USP 3284255 (1966) 81 CA 66, 1989(1967) (An expl initiator contg a mixt of 1 part LA with 2 parts Ba styphnate as primary expl and PETN as a secondary expl. It is claimed that LA-BaSt mixts are no mote dangerous to handle than some secondary expls) Ad 156) G.W.C. Taylor S.E. Napier, USP 3291663(1966)... 

A complete discussion on bridge wires and the tescing of electric detonators is given in Ref 11, where also are shown photographic views of test equipment... 

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