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Birefringence measurement of large-format samples

A birefringence, sample technology, applied in the field of birefringence measurement of large samples, can solve problems such as false detection of birefringence properties

Inactive Publication Date: 2010-02-24
HINDS INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, accurate detection of the intrinsic birefringence properties of large samples requires that the associated optics or the sample be fixed or supported in a manner that does not induce birefringence in the sample, which would lead to a loss of the intrinsic birefringence properties. error detection

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  • Birefringence measurement of large-format samples
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  • Birefringence measurement of large-format samples

Examples

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Embodiment Construction

[0020] according to figure 1 and figure 2 , an embodiment of a birefringence detection system is described. This system uses a dual photoelastic modulator (PEM) device to detect low-level linear birefringence in optical elements. This embodiment can determine the magnitude and angular orientation of birefringence and has specifically designed signal processing means, data collection systems, and algorithms for detecting low levels of linear birefringence with very high precision.

[0021] Such as figure 1 As shown, the dual photoelastic modulator (PEM) device 20 of this embodiment comprises two modules. The source module includes a light source 22, a polarizer 24 oriented at a 45 degree angle, and a PEM 26 oriented at a 0 degree angle. The light source 22 is a polarized helium-neon laser capable of producing a beam of light with a wavelength of 632.8 nm and a spot size (diameter) of approximately 1 mm.

[0022] The detection module includes a second PEM 28 whose modulati...

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Abstract

The disclosure is directed to systems and methods for precisely measuring birefringence properties of large-format samples of optical elements. A gantry-like configuration is employed for precise movement of birefringence measurement system components relative to the sample. There is also provided an effective large-format sample holder that adequately supports the sample to prevent induced birefringence therein while still presenting a large area of the sample to the unhindered passage of light.

Description

technical field [0001] The present application relates to methods for measuring the birefringence of optical components, mainly large components such as large plates for liquid crystal displays (LCD). Background technique [0002] Many important optical materials exhibit birefringence. Birefringence means that light of different linear polarizations travels through the material at different speeds. Most of these different polarizations are often viewed as two mutually perpendicular components of polarized light. Birefringence is an intrinsic property of many optical materials and can also be induced by external forces applied to the material. [0003] Retardation or retardation represents the combined effect of birefringence along the path of a beam of light through a sample. If the incident light is linearly polarized, the two mutually perpendicular components of the polarized light will emerge from the sample with different phases, this is called retardation. The basic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J4/00
Inventor 安德鲁·D·卡普兰詹姆斯·C·曼斯菲尔德道格拉斯·C·马克
Owner HINDS INSTR