An Accurate Method of Measuring Azimuth Based on Sine Wave Magneto-Optic Modulation

Zhiyong, 杨志勇 Yang; Zhaofa, 周召发 Zhou; Xianxiang, 黄先祥 Huang; Zhili, 张志利 Zhang

doi:10.3788/aos201232.1012001

Cited by 3 publications

(1 citation statement)

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“…When the frequency of polarization direction change is  , the above equation can be obtained with sin t  of the fundamental frequency signal and cos2 t  of the two-fold frequency signal. By analyzing the AC signal in Equation ( 12), it can be found that there are two polarization points whose transverse coordinates are not related to the change of the angle d of the detector, and the two polarization points, 1 u and 2 u are respectively [5] :…”

Section: Polarization State Analysismentioning

confidence: 99%

Design of polarization direction detection circuit

Yang,

Li,

Cai

et al. 2023

J. Phys.: Conf. Ser.

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In the polarized light angle measurement system, it is important to detect the polarization direction of linearly polarized light. First, the principle of polarized light angle measurement is introduced, and then the polarization direction detection circuit is designed. This circuit receives the light intensity output signal from the Polarization State Analysis and converts it to an electrical signal. The electrical signal is filtered, amplified, sampled, and integrated to obtain a stable and useful electrical signal waveform. The polarization direction is judged by the waveform, which plays a role in the field of polarized light angle measurement and realizes accurate angle measurement. The simulation results show that the circuit can detect weak light signals and achieve 71.45 dB–97.95 dB adjustable gain. A stable and clear signal waveform can be obtained. The polarization direction can be determined by using the waveform. The circuit has a simple structure, good stability, and easy realization.

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Section: Polarization State Analysismentioning

confidence: 99%

Design of polarization direction detection circuit

Yang,

Li,

Cai

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

The application rule of simple symmetrical wave signal magneto-optical modulation in spatial azimuth measurement

Yang¹,

Huang²,

Zhou³

2014

Optik

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Analysis and research of polarization aberration in rapid space angle measuring system

Li¹,

Lu²,

Lin³

2018

Acta Phys. Sin.

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The precise angle measurement and transmission technology have been widely used in the precision measurement, aerospace, military, biomedicine and other devices, which are based on the polarized light and magneto-optical modulation. This method has the characteristics of no rigid connection required, long distance transmission, high precision, etc. However, the azimuth information measurement method needs the assistance of complex servo tracking system according to the orthogonal extinction principle of polarization prism, meanwhile, the measurement time is longer, which reduces reliability and reaction sensitivity of the system. In order to improve the measurement accuracy and fast response capability of the system, a fast space goniometry method is proposed through the Wollaston prism polarizing beam splitter, with which the azimuth is directly calculated according to the two light intensities. The measurement time can be shortened, and the accuracy is improved by the use of magneto-optical modulation technology. The rapid space angle measuring system needs to realize the measurement function in a certain translation range, which requires the beam to have a certain coverage area in the receiving unit. However, the system is limited by size and volume of the device; we can only choose to expand the incident beam. Therefore, when the beam is incident onto the receiving unit, some incident angle and azimuth, that is, non-vertical incidence will be produced. However, the polarization of the non-vertically incident light passing through the system will change and polarization aberration exists, which will lead to measurement error. In this paper, the beam passes through the polarizing prism in a certain range of azimuths and incident angles, and the polarized light tracing method and the boundary condition of the electromagnetic field are used to study and simulate the polarization change and distribution of the outgoing beam. The changes of different incident azimuths and angles can be simulated through the translation of receiving unit, and the azimuths can be measured indirectly by using self-collimation theodolite and right angle prism. By comparing the measured azimuths under the translational and centering conditions, the influence of polarization aberration on the angle measuring system and the correctness of the theoretical analysis are verified. It is concluded that when the azimuth angle is 0, the measurement error is small; when the azimuth is 90, the measurement error is largest, meanwhile the measurement error will increase with the translation distance becoming longer (i.e., the incident angle). According to the comparison between the experimental data and the simulation results, the existing problems are pointed out, and the corresponding improvement measures are proposed. The results of this work have some significance in guiding the optimization of the system structure, and the further improvement inthe performance of the system.

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An Accurate Method of Measuring Azimuth Based on Sine Wave Magneto-Optic Modulation

Cited by 3 publications

References 0 publications

Design of polarization direction detection circuit

Design of polarization direction detection circuit

The application rule of simple symmetrical wave signal magneto-optical modulation in spatial azimuth measurement

Analysis and research of polarization aberration in rapid space angle measuring system

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