New method for judging azimuth of fast and slow axis of ferroelectric liquid crystal wave plate (FeLC)

A ferroelectric liquid crystal and new method technology, applied in the field of polarized optical detection, can solve the problems of low measurement accuracy, uncomfortable promotion, complicated operation, etc., and achieve the effects of high test accuracy, elimination of 45-degree uncertainty, and wide application range

CN104062094AInactive Publication Date: 2014-09-24NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-09-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of polarized optical detection, and relates to a new method for judging azimuth of a fast and slow axis of a ferroelectric liquid crystal wave plate (FeLC). According to basic principles of a rotating wave plate method and a phase modulation method, the FeLC to be measured is arranged in an elliptic bias field, a function relation between emergent light intensity and reference azimuth of the fast and slow axis of the FeLC is acquired from a polarized optical transmission theory, and reference azimuth of the fast and slow axis is judged via measurement of equality of intensity of two emergent light after FeLC modulation. The measurement method does not depend on FeLC phase delay or a modulation angle or phase delay of other wave plates in the elliptic bias field so that the measurement method is simple, easy to carry out, high in accuracy and can be widely applied to judgment of the fast and slow axis of the ferroelectric liquid crystal wave plate of arbitrary phase delay.
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Description

technical field

[0001] The invention belongs to the technical field of polarization optical detection, in particular to a new method suitable for judging the orientation of the fast and slow axes of a ferroelectric liquid crystal wave plate (FeLC). Background technique

[0002] Under the control of low voltage, the ferroelectric liquid crystal wave plate (FeLC) will quickly change the orientation of its fast and slow axes with a certain modulation angle, so as to realize the modulation of the polarization state. As an important photoelectric modulation device, it is widely used in polarization optics, solar magnetic field measurement, etc. Research areas. For ferroelectric liquid crystal wave plates, although there is no unified requirement for the number of technical parameters representing quality, the direction of the fast and slow axes is one of the technical parameters that must be clearly marked. At present, there are mainly Michelson interferometry, rotating wave pla...

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Embodiment Construction

[0024] Embodiments of the present invention are described as follows in conjunction with accompanying drawings:

[0025] see figure 1 The structure of a new method for judging the orientation of the fast and slow axes of a ferroelectric liquid crystal wave plate (FeLC) in the present invention consists of a light source 1, an interference filter 2, a polarizer 3, a measured sample (FeLC) 4, a wave plate 5, and a detection Polarizer 6, detector 7, oscilloscope 8 and voltage controller 9. The measured sample (FeLC) 4 is controlled by the voltage controller 9 so that its fast axis orientation changes rapidly with the modulation angle Δ. The light beam generated by the light source 1 is filtered by the interference filter 2 to obtain quasi-monochromatic light. It is converted into an electrical signal and sent to the oscilloscope 8 .

[0026] Adopt above-mentioned measuring structure, a kind of new method measuring step of judging ferroelectric liquid crystal wave plate (FeLC) ...