M Herrmann et al 2002 Phys. Med. Biol. 47 3711 doi:10.1088/0031-9155/47/21/306
M Herrmann, M Tani, M Watanabe and K Sakai
Show affiliationsWe have developed a signal amplifier for the detection of weak repetitive pulsed signals superimposed on a large background. It is based on a double gated integrator principle with two channels locked to a sequence of alternate signal and background pulses. The circuit is compact and cost effective, and thus suitable for use in large numbers with detector arrays, for example in terahertz imaging. The performance was verified in terahertz time-domain spectroscopy based on an amplified femtosecond laser and found to be better than that of a commercial lock-in amplifier.
72.40.+w Photoconduction and photovoltaic effects
42.65.Re Ultrafast processes; optical pulse generation and pulse compression
Condensed matter: electrical, magnetic and optical
Issue 21 (7 November 2002)
Received 15 March 2002
Published 17 October 2002
M Herrmann et al 2002 Phys. Med. Biol. 47 3711
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