A quasilinear wide-range radiometer amplifier implemented with correlated phase-sensitive detection
نویسندگان
چکیده
A radiometer amplifier capable of wide-range optical measurement is described. Based on a novel automatically ranged electrometer and amplifier circuit, the radiometer provides a quasilinear analog output for the measurement of input radiation over ten orders of magnitude. Together with the scheme of phase-sensitive detection of modulated optical signals, the circuit resulted in an output voltage of low noise and offset drift. It can be applied directly to various kinds of photodetectors. The application of standard integrated circuits and lock-in amplifiers makes the whole system low cost and it can be readily built. © 1999 American Institute of Physics. @S0034-6748~99!04905-9#
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