## Analog Computer Simulation of a DC Arc Emission Spectrometer Control System to Define Requirements for Optimum Control |

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20 percent 30 amperes AgCl ANALOG COMPUTER SIMULATION analog simulation analytical description approximate arc anode arc control system arc electrodes arc emission process arc function arc instabilities arc temperature argon stabilized dc bias current cathode circuitry computer model computer variables control gain parameters control unit current changes current level current of 30 current oscillations current squared DC ARC EMISSION derivative signal described differential equation electrometer amplifier element emission line emission intensity output experimental data first-order function V^(i hertz integral gain Lewis Research Center linear mathematical model model and real Model response NASA NASA TN natural profile noise disturbances obtained overshoot percent is achieved photomultiplier plasma potentiometer programmed input proportional gains real system responses response to noise result Sample Vaporization sec Figure shown in figure silver chloride spectral line stabilized dc arc stable control stable operation static argon stabilized system stability thyratron current transient effects transient response waveform zero