Abstract: A constant energy, constant spark rate ignitor system suitable for use in high energy ignition systems. The ignitor system includes a vacuum interrupter switch through which an energy storage capacitor discharges to fire a surface gap spark plug. Discharge of the energy storage capacitor through the vacuum interrupter can only occur upon actuation of the switch. The quantity of energy stored in the energy storage capacitor and the timing of capacitor discharge is therefore not a function of ambient operating conditions or the dielectric properties of the switch and can therefore be independently controlled. A voltage comparator and spark rate clock are used to trigger closure of the vacuum interrupter switch and fire the plug when the capacitor contains the desired quantity of energy and a clock signal is present. A current proving circuit is also provided to verify that current passes through the spark plug.

Abstract: A flame scanning system for monitoring a combustion process by detecting flame emission characteristics in the ultraviolet light spectrum. A metered relative flame intensity signal, flame-off signal, and flame-on signal are provided. A self-diagnostic feature produces a flame marginal signal indicative of substandard flame operation; a tube marginal signal indicative of imminent UV tube failure is also produced. A scanner shutter mechanism includes a check failure feature for detecting UV tube failure. An electronic assisted sighting indicator is also included to assist during on-sight scanner positioning and to provide optimum scanner placement.