装置と技術

キセノンランプの直流電流変調

岩田哲郎、今本洋平、荒木　勉、内田照雄

　　We have developed a technique for modulating a xenon (Xe) lamp that is usually driven by a direct-current (dc) mode. The lamp current is sinusoidally modulated using a metal-oxide-semiconductor field-effective-transistor (MOSFET), which is connected in series to the Xe lamp. To operate in a high frequency region, an LC filter is attached on the anode side of the Xe lamp. The degree of modulation was 90 % at a frequency 1 kHz and was 25 % at a frequency 100 kHz, respectively. In combination with a loch-in amplifier, fluorescence measurement under the dc background light was carried out to demonstrate the performance of the modulated Xe Lamp.

Keywords: Xenon lamp, light source, modulation, spectroscopic instrument