| 摘要 |
1. An electronic ordnance fuze adapted to function upon receiving a target signal that increases in amplitude for at least a predetermined length of time, said fuze comprising: input means adapted to receive an alternating-current signal of increasing amplitude; first means for obtaining from said alternating-current signal a first negative-going unipotential signal of increasing amplitude, a ripple frequency due to the original alternating current being superimposed on said unipotential signal; an amplifier tube having at least a control grid, a screen grid, and an anode; means for applying said negative-going unipotential signal to said control grid; sources of direct current supply voltage for said screen grid and said anode, the voltage at the screen grid being maintained more positive than the voltage at the anode and the operating conditions being so maintained that the anode current remains substantially saturated for control grid signals more positive than a predetermined negative value; means for taking an amplified unipotential signal from said screen grid, said screen grid thus resembling functionally the plate of a triode amplifier; first and second capacitor means for coupling said ripple frequency present in said first negative-going unipotential signal to said screen grid and to said anode, said capacitor means tending to filter out said ripple, the degree of filtering being dependent upon the gain of said amplifier tube; means for obtaining a direct-current feedback voltage from said anode; a biased diode; means for applying said feedback voltage to said control grid through said biased diode, so that, if said alternating-current signal is of sufficient amplitude and increases in amplitude at an abnormally large rate, a direct-coupled inverse feedback voltage is applied to said control grid, reducing the gain of said amplifier but permitting the ripple-frequency output of said amplifier to increase; resistance-capacitance differentiator means adapted to produce a unipotential output signal upon receiving a positive-going unipotential signal from said screen grid of said amplifier; diode rectifier-limiter means connected between the output of said differentiator means and ground, said rectifier-limiter means serving to prevent the output of said differentiator means from rising appreciably above ground potential and serving also to rectify any component of said ripple frequency present in the input of said differentiator means, so as to make the output of said differentiator means more negative when the ripple-frequency output of said amplifier increases; resistance-capacitance integrator means connected to the output of said differentiator means; a thyratron; means for applying to the grid of said thyratron a signal from the output of said integrator means; and fixed bias means for maintaining the output of said differentiator and the grid of said thyratron at values sufficiently negative to prevent firing of said thyratron in the absence of a signal.
|
