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Detecting device and method for continuous wave terahertz real-time watermark imaging

An imaging detection and terahertz technology, which is applied in measuring devices, banknote authenticity inspection, and material analysis through optical means, can solve the problems of slow imaging speed, cumbersome data processing, and small imaging area, and achieve good real-time performance , low energy and high detection sensitivity

Inactive Publication Date: 2015-12-23
CAPITAL NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems of small measurable sample imaging area, slow imaging speed, and cumbersome data processing in existing imaging devices and imaging methods, the present invention provides a terahertz wave real-time watermark imaging detection device and imaging device with simple structure and convenient operation. method

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Embodiment

[0034] Select the SIFIR-50co2 laser pumped continuous wave terahertz radiation source from Coherent Corporation of America, and adjust the frequency to 2.52THz. The designed high-resistance silicon thickness is h=400μm, the radius of the high-resistance silicon wafer is r=25mm, the resistivity of the high-resistance silicon is 10000Ωcm, the working wavelength of the tunable argon ion laser is 514nm, the beam diameter is 0.75mm, and the power is 2W. Make the terahertz wave of the corresponding frequency focus on the preset middle position of high-resistance silicon. The terahertz wave detector (9) selects the IRV-T0831C focal plane array camera from NEC Corporation of Japan, and is connected to the computer (10) through a USB interface, with high detection sensitivity and good real-time performance.

[0035] A continuous wave terahertz real-time watermark imaging detection method, comprising the following steps:

[0036] a. The continuous wave terahertz radiation source (1) em...

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Abstract

The invention discloses a detecting device and method for continuous wave terahertz real-time watermark imaging. The detecting device comprises a continuous wave terahertz radiation source, a collimating beam-expanding system, a high-resistance silicon wafer, an argon ion laser, an off-axis parabolic lens, a sample platform, a terahertz wave detector and a computer. According to the detecting device provided by the invention, the collimating beam-expanding system is utilized to collimate the terahertz wave into parallel beams; the off-axis parabolic lens is used for expanding the beams for the second time; after the beams penetrate through a sample, the beams are focused on the terahertz wave detector; the computer is used for performing real-time imaging display on the image; the turning-on / off control on the detecting device is realized by utilizing a fact that whether the argon ion laser beam illuminates on the high-resistance silicon wafer or not. The detecting device for continuous wave terahertz real-time watermark imaging provided by the invention has the advantages of compact structure, high response speed, convenient switching, real-time watermark imaging and significant practical application value, and is also capable of performing non-destructive detection on the hazardous metal hidden in the packaging articles such as newspaper, fabrics and plastics.

Description

technical field [0001] The invention relates to an imaging detection device and an imaging method thereof, in particular to a continuous wave terahertz real-time watermark imaging detection device and an imaging method thereof. Background technique [0002] Terahertz (THz) radiation means that the oscillation frequency is between 0.1THz-10THz (1THz=10 12 Hz), the electromagnetic radiation in this band has many unique properties: 1) THz waves have good penetrability to many dielectric materials and non-polar liquids, so terahertz waves can perform perspective imaging on opaque objects; 2) Another notable feature of THz wave is its safety. Its photon energy is very low, which is safe for living organisms; 3) THz wave band also contains rich spectral information and has good spectral resolution characteristics. Therefore, terahertz technology has unique advantages in fields such as biomedicine and safety monitoring. [0003] At present, considering the radiation source, THz i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84G07D7/12
Inventor 申彦春赵国忠刘影王佳
Owner CAPITAL NORMAL UNIVERSITY
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