TY - JOUR
T1 - Note
T2 - Innovative demodulation scheme for coherent detectors in cosmic microwave background experiments
AU - Ishidoshiro, K.
AU - Chinone, Y.
AU - Hasegawa, M.
AU - Hazumi, M.
AU - Nagai, M.
AU - Tajima, O.
N1 - Funding Information:
We acknowledge QUIET collaboration, especially California Institute of Technology (Caltech), Jet Propulsion Laboratory (JPL), and Fermi National Accelerator Laboratory for providing detectors and their electronics to control the detector bias. We also thank Donna L. Kubik for carefully reading the manuscript. This work was supported by a Grant-in-Aid for Scientific Research on Innovative Areas (21111002) of The Ministry of Education, Culture, Sports, Science, and Technology, Japan.
PY - 2012/5
Y1 - 2012/5
N2 - 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.
AB - 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.
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U2 - 10.1063/1.4719922
DO - 10.1063/1.4719922
M3 - Review article
AN - SCOPUS:84862132748
SN - 0034-6748
VL - 83
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
IS - 5
M1 - 056104
ER -