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Transmission imaging device and method based on tera-hertz quantum device

A quantum device and imaging device technology, applied in the field of terahertz applications, can solve the problems of affecting imaging quality, difficulty in realization, slow response speed of THz thermal detectors, etc., achieve high terahertz light collection efficiency, good detection effect, and reduce impact Effect

Inactive Publication Date: 2012-05-09
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the relatively slow response speed of the above-mentioned THz thermal detectors, it is difficult to realize the imaging under the condition that the pulse-masing THz QCL (usually with a pulse frequency of 5 kHz and a pulse width of 1 μs) is used as a radiation source
In addition, the response frequency range of the above-mentioned thermal detector is very wide, and the imaging quality is easily affected by the interference of environmental noise during the imaging process.

Method used

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  • Transmission imaging device and method based on tera-hertz quantum device
  • Transmission imaging device and method based on tera-hertz quantum device
  • Transmission imaging device and method based on tera-hertz quantum device

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Embodiment 1

[0072] This embodiment provides a transmission imaging device based on a terahertz quantum device, such as figure 1 As shown, the imaging device includes a light source part A, an optical path part B and a detection part C.

[0073] The light source part includes:

[0074] A driving power supply for outputting electrical signals;

[0075] The first cold head is used to provide a low temperature environment;

[0076] a first heat sink installed in the first cold head for conducting heat;

[0077] A terahertz quantum cascade laser, installed on the first heat sink, is used to radiate terahertz light under the trigger of the electrical signal;

[0078] a first polyethylene window, installed on the first cold head, to allow the terahertz light to emit through the first polyethylene window;

[0079] The optical path part includes:

[0080] The first off-axis parabolic mirror is used to collect and reflect the terahertz light emitted through the first polyethylene window;

[0...

Embodiment 2

[0140] This embodiment provides an imaging method of the transmission imaging device based on a terahertz quantum device described in Embodiment 1. The imaging method includes the following steps:

[0141] Step 1: Install the sample to be tested on the two-dimensional electric translation stage with a fixture, and place the sample to be tested at the common focus of the second off-axis paraboloid and the third off-axis parabola in the optical path, so that the sample to be tested The surface is perpendicular to the propagation direction of the terahertz light.

[0142] A notebook computer is used to control the movement of the X-Z two-dimensional electric translation stage, so that each part of the sample to be tested is penetrated by the terahertz light at the focal point, and at the same time, the position information of the sample to be tested at the focal point is recorded in the notebook computer. The moving step of the two-dimensional electric translation stage in the X ...

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Abstract

The invention provides a transmission imaging device and method based on a tera-hertz quantum device. The transmission imaging device comprises a light source part, an optical path part and a detection part, wherein the light source part comprises a driving power supply, a first cold head, a first heat sink arranged in the first cold head, a tera-hertz quantum cascaded laser arranged on the first heat sink and a first polyethylene window arranged on the first cold head; the optical path part comprises a first off-axis parabolic mirror, a second off-axis parabolic mirror, a two-dimensional electric translation platform, a third off-axis parabolic mirror and a fourth off-axis parabolic mirror; and the detection part comprises a second cold head, a second polyethylene window arranged on the second cold head, a second heat sink arranged in the second cold head, a tera-hertz quantum trap detector arranged on the second head sink, a signal processing circuit, an oscilloscope and a computer. The device and the method have the advantages that: an adopted tera-hertz radiation source can work in the pulse mode; and due to the adoption of the tera-hertz quantum trap detector serving as a signal detector, the imaging speed of a system can be increased effectively, and the imaging quality can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of terahertz applications, and relates to an imaging device, in particular to a transmission imaging device and an imaging method based on a terahertz quantum device. Background technique [0002] With the continuous innovation in the fields of photonics and nanotechnology, terahertz (THz, 1THz=10 12 Hz) waves have achieved rapid development in information and communication technology, national security, biomedicine, non-destructive testing, quality control of food and agricultural products, global environmental monitoring, etc., and are considered to have great application prospects and applications in the above fields value. In recent years, with the in-depth research on important radiation sources and detectors in the THz frequency band - THz quantum cascade laser (terahertz quantum-cascade laser, THzQCL) and quantum well detector (terahertz quantum-well photodetector, THz QWP), based on The application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/27
CPCG01N2021/5973G01N21/27G01N21/3581
Inventor 谭智勇曹俊诚周涛陈镇郭旭光张戎
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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