Design and calibration of a high-sensitivity and high-accuracy polarimeter based on liquid crystal variable retarders
Polarimetry plays an important role in the measurement of solar magnetic fields. We devel- oped a high-sensitivity and high-accuracy polarimeter （HHP） based on nematic liquid crystal variable retarders （LCVRs）, which has a compact setup and no mechanical moving parts. The system design and calibrati...
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| Veröffentlicht in: | Research in astronomy and astrophysics 2017, Vol.17 (1), p.87-96 |
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| container_title | Research in astronomy and astrophysics |
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| creator | Guo, Jing Ren, De-Qing Liu, Cheng-Chao Zhu, Yong-Tian Dou, Jiang-Pei Zhang, Xi Beck, Christian |
| description | Polarimetry plays an important role in the measurement of solar magnetic fields. We devel- oped a high-sensitivity and high-accuracy polarimeter （HHP） based on nematic liquid crystal variable retarders （LCVRs）, which has a compact setup and no mechanical moving parts. The system design and calibration methods are discussed in detail. The azimuth error of the transmission axis of the polarizer as well as the fast axes of the two LCVRs and the quarter-wave plate were determined using dedicated procedures. Linearly and circularly polarized light were employed to evaluate the performance of the HHP. The experimental results indicate that a polarimetric sensitivity of better than 5.7 × 10-3 can be achieved by using a single short-exposure image, while an accuracy on the order of 10-5 can be reached by using a large number of short-exposure images. This makes the HHP a high-performance system that can be used with a ground-based solar telescope for high-precision solar magnetic field investigations. |
| doi_str_mv | 10.1088/1674-4527/17/1/8 |
| format | Article |
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We devel- oped a high-sensitivity and high-accuracy polarimeter （HHP） based on nematic liquid crystal variable retarders （LCVRs）, which has a compact setup and no mechanical moving parts. The system design and calibration methods are discussed in detail. The azimuth error of the transmission axis of the polarizer as well as the fast axes of the two LCVRs and the quarter-wave plate were determined using dedicated procedures. Linearly and circularly polarized light were employed to evaluate the performance of the HHP. The experimental results indicate that a polarimetric sensitivity of better than 5.7 × 10-3 can be achieved by using a single short-exposure image, while an accuracy on the order of 10-5 can be reached by using a large number of short-exposure images. 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We devel- oped a high-sensitivity and high-accuracy polarimeter （HHP） based on nematic liquid crystal variable retarders （LCVRs）, which has a compact setup and no mechanical moving parts. The system design and calibration methods are discussed in detail. The azimuth error of the transmission axis of the polarizer as well as the fast axes of the two LCVRs and the quarter-wave plate were determined using dedicated procedures. Linearly and circularly polarized light were employed to evaluate the performance of the HHP. The experimental results indicate that a polarimetric sensitivity of better than 5.7 × 10-3 can be achieved by using a single short-exposure image, while an accuracy on the order of 10-5 can be reached by using a large number of short-exposure images. 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| ispartof | Research in astronomy and astrophysics, 2017, Vol.17 (1), p.87-96 |
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| language | eng |
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| source | IOP Publishing Journals; Alma/SFX Local Collection |
| subjects | Astronomical polarimetry Calibration Liquid crystals Nematic crystals Polarimeters Retarders Solar magnetic field 可变 旋光仪 液晶 相位延迟器 设计 高性能系统 高灵敏度 高精度 |
| title | Design and calibration of a high-sensitivity and high-accuracy polarimeter based on liquid crystal variable retarders |
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