Note: Innovative demodulation scheme for coherent detectors in cosmic microwave background experiments

K. Ishidoshiro, Y. Chinone, M. Hasegawa, M. Hazumi, M. Nagai, O. Tajima

Research output: Contribution to journalReview articlepeer-review

1 Citation (Scopus)

Abstract

We propose an innovative demodulation scheme for coherent detectors used in cosmic microwave background polarization experiments. Removal of non-white noise, e.g., narrow-band noise, in detectors is one of the key requirements for the experiments. A combination of modulation and demodulation is used to extract polarization signals as well as to suppress such noise. Traditional demodulation, which is based on the two-point numerical differentiation, works as a first-order high pass filter for the noise. The proposed demodulation is based on the three-point numerical differentiation. It works as a second-order high pass filter. By using a real detector, we confirmed significant improvements of suppression power for the narrow-band noise. We also found improvement of the noise floor.

Original languageEnglish
Article number056104
JournalReview of Scientific Instruments
Volume83
Issue number5
DOIs
Publication statusPublished - 2012 May
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation

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