| 摘要 |
An electric spark type light source for producing light for spectroscopic analysis, comprising an analytical spark gap, an energy storage capacitor, a charging and discharging circuit for alternately charging the capacitor and causing the capacitor to discharge across the spark gap to generate sparks which produce light for spectroscopic analysis, such circuit including at least one inductance coil for causing the discharge current through the spark gap to be oscillatory and pulsating in waveform, the circuit including rectifier means for causing the discharge current through the spark gap to have at least a unidirectional component, and time gate pulse generating means for deriving time gate pulses from the circuit in synchronized relation with the oscillatory pulsating spark gap current for use in selecting repetitive segments of the light from the sparks for spectroscopic analysis. The time gate pulses may be derived from the rectifier current, the capacitor discharge current or the spark gap current. A current transformer, a threshold detector and variable delay means may be employed to generate the time gate pulses. The circuit may comprise a capacitor path including a first inductance coil, a spark gap path across the capacitor path and including a second inductance coil, and a rectifier path in parallel with the spark gap path and including a third inductance coil. The spark gap path may include electronic switching means for initiating the discharge of the capacitor across the spark gap. The rectifier means may take the form of a bridge rectifier having its alternating current input terminals connected to an alternating current power supply for charging the capacitor. The direct current output terminals of the bridge rectifier may be connected into the rectifier path for producing a unidirectional pulsating oscillatory current in the rectifier path, while also causing the oscillatory pulsating spark gap current to have at least a unidirectional component.
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