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Terahertz polarization real-time imaging method

A real-time imaging, terahertz technology, applied in polarization spectrum, instrument, polarization influence characteristics, etc., can solve the problems of narrow application range and insufficient detection accuracy, and achieve the effect of high-precision identification and wide application range

Active Publication Date: 2010-09-15
上海微太宝驰光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] The present invention provides a method for real-time imaging of terahertz polarization to solve the technical problems in the above-mentioned background technology: only a single polarization component of terahertz radiation can be detected, the application range is narrow, and the detection accuracy is not high enough

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Embodiment 1

[0072] Select a magnetic plate (thickness is about 2mm) and a glass (thickness is about 2mm) to form a sample, the sample includes magnetic plate part, glass part and air part (such as figure 2 shown). Put the sample into the imaging device, adjust the polarization angle of the probe light by adjusting the half-wave plate 9, measure the horizontal and vertical polarization components of the terahertz pulse respectively, and obtain two sets of time-domain image data sets of the sample.

[0073] The corresponding time-domain signal is extracted from each pixel. Such as image 3 As shown, from top to bottom are the spectral line diagrams of air, glass and magnetic plate. The dark solid line represents the horizontal polarization component, and the light dotted line represents the vertical polarization component. The horizontal axis is the time difference obtained by dividing the optical path difference between the pump light and the probe light by the speed of light; the vert...

Embodiment 2

[0077] Choose a quartz crystal (thickness is about 1.7mm) and a quartz glass (thickness is about 1mm), form a sample with the glass in embodiment 1, sample comprises quartz crystal, quartz glass, glass and air part (as Image 6 shown). Put it into the imaging device, measure the horizontal and vertical polarization components of the terahertz pulse respectively, Figure 7 The dark solid line represents the horizontal polarization component, and the light dotted line represents the vertical polarization component. The horizontal axis is the time difference between the pump light and the probe light, and the vertical axis is the relative intensity of the signal.

[0078] Figure 8a with Figure 8b Shown in are the horizontally polarized terahertz image Ex and the vertically polarized terahertz image Ey, respectively. The horizontal axis is the position coordinate, and the vertical axis is the position coordinate. The relative intensity image of the sample is calculated by (...

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Abstract

The invention discloses a terahertz polarization real-time imaging method, which comprises the following steps of: (1) putting samples to be tested in a terahertz polarization real-time imaging device; (2) continuously changing the optical path difference between pump light and detection light, and measuring a polarized component Ex of a terahertz pulse passing through the samples; (3) changing the polarization state of the detection light, continuously changing the optical path difference between the pump light and the detection light again, and measuring another polarized component Ey of the terahertz pulse; and (4) processing two groups of terahertz polarized components of the samples, and forming relative-intensity images. The terahertz polarization real-time imaging method can rapidly and accurately measure different polarized components of terahertz light waves, highly precisely identifies target objects, and has wide application range.

Description

technical field [0001] The invention relates to an imaging method, in particular to a real-time terahertz polarization imaging method. Background technique [0002] The basic information of light waves mainly includes four parts, namely amplitude, frequency, phase and polarization. The first thing humans can detect is the amplitude information of visible light, and the images obtained are black and white images; with the development of detection materials, the frequency information of light waves can be detected, and the combination of amplitude and frequency information can display color images; using holographic technology, Humans may now be able to detect the phase information of light waves. Polarization is a nature of light, and its detection can obtain very rich optical information. The research on polarization imaging has rapidly become the research focus of imaging technology at home and abroad in recent years. [0003] As an important branch of polarization imagin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84G01J3/447G01N21/21
Inventor 张岩
Owner 上海微太宝驰光电科技有限公司
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