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Terahertz imaging method and device based on dark field imaging

A technology of terahertz imaging and dark field imaging, applied in the field of terahertz quasi-light imaging, can solve the problems of low ratio and small difference of terahertz transmission/reflectivity, and achieve the effect of real-time imaging

Active Publication Date: 2021-03-19
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the contrast of terahertz biomedical images is often very low, mainly due to the high water content of biological tissues, water has a strong absorption of terahertz waves, and some different types of biological tissues have little difference in the transmission / reflection of terahertz

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  • Terahertz imaging method and device based on dark field imaging
  • Terahertz imaging method and device based on dark field imaging
  • Terahertz imaging method and device based on dark field imaging

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0022] At present, most traditional terahertz biomedical imaging methods have low imaging contrast and poor imaging quality. The present invention aims to introduce dark field imaging in optical imaging into terahertz imaging to improve imaging contrast. Compared with traditional imaging methods, dark-field imaging adds a beam baffle to the spectrum plane to filter out the low-frequency information of the target, thereby extracting the high-frequency information of the target. Since low-frequency information represents the background and high-frequency information represents the details of the target, dark-field imaging can suppress the background and extract the target details, thereby achieving high-contrast imaging. T...

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Abstract

The invention discloses a terahertz imaging method and device based on dark field imaging. The method comprises the following steps that a collimated terahertz beam is transmitted through a target toobtain a first transmission beam; the first transmission beam is propagated by a distance f and then is modulated by a first lens to obtain a second transmission beam; the second transmission beam ispropagated by the distance f and then passes through a beam baffle of a spectrum surface to obtain a third transmission beam; the third transmission beam is propagated by the distance f and then is modulated by a second lens to obtain a fourth transmission beam; and the fourth transmission beam is propagated by the distance f and then is received by a terahertz camera to be imaged. The dark fieldimaging technology is introduced into terahertz imaging, and the characteristic of high-contrast imaging can be achieved by combining with dark-field imaging, so that high-contrast terahertz imaging is achieved.

Description

technical field [0001] The present invention relates to the technical field of terahertz quasi-light imaging, in particular to a terahertz imaging method and device based on dark field imaging. Background technique [0002] Terahertz waves have a certain penetrating ability to biological tissues, and the single photon energy is low, and will not cause ionization of biological tissues. It is very safe in biomedical imaging and is suitable for biomedical imaging. However, the contrast of terahertz biomedical images is often very low, mainly due to the high water content of biological tissues, water has a strong absorption of terahertz waves, and some different types of biological tissues have little difference in the transmission / reflection of terahertz. Therefore, there is an urgent need to study terahertz high-contrast imaging methods. Dark-field imaging technology is widely used in optical imaging. Compared with common imaging methods, dark-field imaging achieves imaging c...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3586
CPCG01N21/3586
Inventor 吴世有刘辉李超常超方广有
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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