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Polarization Calibration of a Microwave Polarimeter with Near-Infrared Up-Conversion for Optical Correlation and
Francisco J Casas1, Patricio Vielva1, R Belen Barreiro1
1Instituto de Física de Cantabria (IFCA), Avda. Los Castros s/n, 39005 Santander, Spain.
Sensors (Basel, Switzerland)
|October 27, 2022
Summary
A new polarization calibration method enhances microwave polarimeter accuracy for cosmic microwave background (CMB) measurements. This technique corrects systematic errors, enabling precise Stokes parameter determination for CMB radiation studies.
Area of Science:
- Astrophysics and Instrumentation
- Optical Engineering
- Microwave Engineering
Background:
- Cosmic Microwave Background (CMB) radiation requires precise polarization measurements.
- Existing polarimeters face challenges with systematic errors affecting accuracy.
- Near-infrared (NIR) frequency up-conversion offers novel approaches for signal detection.
Purpose of the Study:
- To present a novel polarization calibration method for a microwave polarimeter demonstrator.
- To enable accurate measurement of CMB polarization by correcting systematic errors.
- To validate the method using a laboratory setup with a variable polarization angle input signal.
Main Methods:
- Developed a polarization calibration procedure for a microwave polarimeter.
- Utilized a near-infrared (NIR) frequency up-conversion stage for signal detection at 1550 nm.
- Employed sinusoidal function fitting (additive/multiplicative terms) to correct polarization errors.
Main Results:
- Achieved high polarization efficiency and low polarization angle errors.
- Demonstrated that accuracy improves with the number of terms in fitting functions.
- Showed that typical and ultra-sensitive CMB experiment error levels are attainable.
Conclusions:
- The proposed calibration method effectively corrects systematic errors in microwave polarimeters.
- The technique is adaptable for various CMB experiment sensitivities, from low-frequency to ultrasensitive B-mode.
- This advancement facilitates more precise cosmological observations through improved polarimetry.
Keywords:
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