New demodulation scheme for coherent polarimeters in CMB experiments

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

doi:10.1117/12.925784

5 October 2012 New demodulation scheme for coherent polarimeters in CMB experiments

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

Proceedings Volume 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI; 845237 (2012) https://doi.org/10.1117/12.925784
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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, which is from the stronger suppression to the tail of 1/f noise.

Citation Download Citation

K. Ishidoshiro, Y. Chinone, M. Hasegawa, M. Hazumi, M. Nagai, and O. Tajima "New demodulation scheme for coherent polarimeters in CMB experiments", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 845237 (5 October 2012); https://doi.org/10.1117/12.925784

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