US EPA

8216922 

Meetings & Symposia 

Overview of recent developments of optopyrotechnics for space applications 

Dilhan, D; Farfal, P; Cahuzac, F; Moulard, H; Ritter, A 

2008 

English 

Laser initiation activities are in progress with ISL for CNES Toulouse (French Space Agency) since 1996. A laser initiator (IOP) equivalent to the electro-explosive NASA Standard initiator has been developed and thoroughly tested in accordance to a space qualification programme. A laser initiated detonator (DOP) without use of primary explosives has been designed by ISL for CNES. The detonator is based on two stages, one dedicated to the high pressure combustion for the acceleration of a flyer that impacts the second one corresponding to the high explosive detonator output. The variation of the functional parameters of the donor (mass, density, diameter of HMX, angle of incidence of the internal flyer) and also of the receptor (diameter, density of RDX) have been tested to assess their influence on the performances of the lst/2nd stages Shock to Detonation Transition. The output detonic properties of the detonator have been verified after mechanical and thermal environments in worst case configurations with different targets representative of the terminal functions of Ariane 5 (e.g. flexible linear shaped charges; TBI; flexible detonating cords,⋯). The results of these activities are detailed in the paper. This paper also addresses the possible implementation of the Optopyrotechnic technology on Launch Vehicles. It reminds of the expected advantages, in terms of cost reduction, decreasing of sensitivity to ESD and EMI, simplifications of AIT (Assembly, Integration & Tests). Trade-offs to be dealt with (technological choices vs. system constraints: functional needs, harsh environments, safeguard regulations, testability⋯), and the general approach implemented to reach the Technology Readiness Level needed, are presented. © 2008 by CNES and ASTRIUM Space Transportation.