Study of design parameters of explosive initiators with respect to space environments Final report
Environmental hazards to explosives and explosive triggering devices encountered on manned space flights
HAZARD↗
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Results for “Trigger”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Spacecraft hydraulic timers
Hydraulic timers for triggering celestial events on Ranger Block III and Marine IV spacecraft
TIMING APPARATUS↗
Proposed method of rotary dynamic balancing by laser
Laser method, where high energies of monochromatic light can be precisely collimated to perform welding and machining processes, is proposed for rotary dynamic balancing. The unbalance, as detected with the velocity pickup, would trigger the laser system which would emit high energy pulses directed at the heavy side of the component.
Perkins, W. E.↗
Some Aspects of an Air-Core Single-Coil Magnetic Suspension System
This paper presents some of the technical aspects in the development at the Langley Research Center of an air-cove, dual-wound, single-coil, magnetic-suspension system with one-dimensional control. Overall electrical system design features and techniques are discussed in addition to the problems of control and stability. Special treatment is given to the operation of a dual-wound, high-current support coil which provides the bias fields and superimposed modulated field. Other designs features include a six-phase, solid-state power stage for modulation of the relatively large magnitude control current, and an associated six-phase trigger circuit.
SUPPORT SYSTEM↗
Liquid propulsion
The Resonant Combustion Program uses a bombing technique to precipitate the transition from the steady state to the resonant, or oscillatory, rocket combustion mode. The initial pressure disturbance produced by the high-explosive device, when exploded in a nonreactive environment of cold N2 gas, is a blast-wave having an initial amplitude of several thousand psi (within a radius of approximately one inch from the bomb case) which is still several hundred psi strong even at a radius of 4 to 5 in. The use of such a severe triggering disturbance has brought up the question of whether or not the violent sustained oscillatory mode observed in this program is forced by the character of the initial disturbance itself.
INJECTOR↗
One-shot pulse shaper circuit
Pulse shaper circuit exhibits low power dissipation, self setting, and easy triggering. It is basically a magnetic one-shot multivibrator consisting of two blocking oscillators and an inhibit circuit.
Radys, R. G.↗
Fuel transfer system permits rapid coupling
Docking and fuel transfer system provides an efficient method for transferring fuel from a tanker to another vehicle. With this system, no triggering operation is required prior to docking, the support system can be rigidized by simply locking the rams of shock absorbers, and no separate fuel line coupling action is required.
West, A. M.↗
Electronic gating circuit and ultraviolet laser excitation permit improved dosimeter sensitivity
Standard dosimeter reader, modified by adding an electronic gating circuit to trigger the intensity level photomultiplier, increases readout sensitivity of photoluminescent dosimeter systems. The gating circuit is controlled by a second photomultiplier which senses a short ultraviolet pulse from a laser used to excite the dosimeter.
Eggenberger, D.↗
Tunnel diode circuit used as nanosecond-range time marker
Simple tunnel diode time marker circuit determines the time at which an event occurs in a scintillation crystal. It is capable of triggering at voltages as low as the noise level of a 10-stage PM tube.
Larsen, R. N.↗
High-speed camera synchronization
Photoelectric sensor enables synchronization of the rotating mirror in a high-speed framing camera with the passage of a very-high-velocity droplet to obtain direct photographic data on droplet breakup. It detects droplet movement across a high intensity light beam and generates a signal triggering the camera.
Rojec, E. A.↗
Transistorized Marx bank pulse circuit provides voltage multiplication with nanosecond rise-time
Base-triggered avalanche transistor circuit used in a Marx bank pulser configuration provides voltage multiplication with nanosecond rise-time. The avalanche-mode transistors replace conventional spark gaps in the Marx bank. The delay time from an input signal to the output signal to the output is typically 6 nanoseconds.
Jung, E. A.↗
Development of high voltage - High current switches Final report
Envelope, electrode, and trigger design for high voltage high current switch
Price, H. N.↗
Research in the development of an improved multiplier phototube Final report
Triggered light sources, after pulsing, and materials for multiplier phototubes
Barr, F. H.↗
Firing squibs by low voltage capacitor discharge for spacecraft application.
Design procedure for low voltage capacitor discharge circuits to trigger electroexplosive devices in aerospace vehicles
Earnest, J. E., Jr.↗
Explosive high-speed shutter.
Explosive high speed spectrographic shutter noting opening, closing, triggering and delay times
Nims, D. J.↗
Positive and Negative Output Circuits
Trigger circuit has a fixed positive output in the on state and a fixed negative output in the off state. The amplitude of the positive and negative pulses may be independently chosen.
Maslowski, E. A.↗
Data processing method for a weak, moving telemetry signal
Method of processing data from a spacecraft, where the carrier has a low signal-to-noise ratio and wide unpredictable frequency shifts, consists of analogue recording of the noisy signal along with a high-frequency tone that is used as a clock to trigger a digitizer.
Kendall, W. B.↗
Magnetic structure of sunspot groups which produce solar proton flares
Effects of magnetic structure in sunspot groups in triggering solar proton flares
Sakurai, K.↗