Device for real-time measurement of sun polarization stokes vector

Abstract

The invention provides a device for the real-time measurement of a sun polarization stokes vector. The device comprises a spectral filter, a wave plate array, a polarizer array and a light intensity acquisition camera. A solar magnetic field provides a driving force and an energy source for the activity outbreak of the sun, while the measurement on the sun polarization stokes vector is the only way for the detection of the solar magnetic field. According to the technical scheme of the invention, a novel device for the real-time measurement of the sun polarization stokes vector is provided. Based on the micro-optical technology principle, the microwave plate array is prepared. On the above basis, the micro-polarizer array is prepared and is attached to the photosensitive surface of the light intensity acquisition camera. In this way, the information of the sun polarization stokes vector can be obtained through the single-exposure process. Compared with a conventional device, the above device is compact in structure and high in real-time property. Meanwhile, the device does not need to be finely tuned or manually operated, and is wide in spectral response range, low in cost and suitable for mass production. At the same time, the occurrence of detection errors, due to the non-uniform response of the camera, aberration and the like, can be avoided. The device can be conveniently extended and applied to other application fields.

Description

technical field [0001] The invention relates to the field of polarization measurement, in particular to a device that can be used for real-time measurement of the solar polarization Stokes vector. Background technique [0002] The solar magnetic field is the driving force and energy source of solar activity explosions, and the solar polarization Stokes vector measurement is the only way to detect the solar magnetic field. Traditional solar polarization measurements often use time-sharing modulation (such as figure 2 shown) and sub-amplitude simultaneous modulation (as image 3 shown) way. Time-division modulation includes rotating the wave plate, modulating the phase delay of the wave plate, modulating the direction of the optical axis of the wave plate, etc. [0003] figure 2 (a) shows the way to rotate the wave plate, wherein 2-1 is a 1 / 4 wave plate, 2-2 is an electric angle rotation stage, 2-3 is a polarizer, 2-4 is a light intensity acquisition camera, 2- 5 is the c...

AI Technical Summary

Problems solved by technology

[0007] However, affected by the environment, during the two exposure periods of the light intensity acquisition camera, the sunlight entering the polarization measurement device has light intensity flicker, so the measurement accuracy of the time-sharing modulation method is limited.

In addition, there is mechanical vibration in the way of rotating the wave plate, and the modulation frequency is low. In order to achieve high system stability, there are high requirements for the diagonal rotating table, and the cost is high; It is sensitive to temperature, often requires additional constant temperature equipment, and the system is complex

The method of modulating the direction of the optical axis of the wave plate is also sensitive to temperature because the direction of the optical axis of the FLC is also difficult to process and the cost is high. It is difficult to meet the requirements of some systems; Complicated, and there is inhomogeneity among the cameras, which affects the measurement accuracy

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