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Method and system for improving signal-to-noise ratio of fast terahertz spectroscopy system based on code modulation

A coding modulation and spectral system technology, which is applied in the field of signal-to-noise ratio improvement of fast terahertz spectral systems, can solve the problems that the level of signal-to-noise ratio needs to be improved, the signal-to-noise ratio and timeliness cannot be taken into account, etc., so as to improve the interference ability and increase the internal Correlation, the effect of improving the level of signal-to-noise ratio

Active Publication Date: 2022-05-10
青岛青源峰达太赫兹科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, seek to design a method and system for improving the signal-to-noise ratio of a fast terahertz spectroscopy system based on coded modulation, and solve the problems existing in the current generation and detection of terahertz signals based on photoconductive antennas. The signal-to-noise ratio and timeliness cannot be balanced, and the overall level of signal-to-noise ratio needs to be improved

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  • Method and system for improving signal-to-noise ratio of fast terahertz spectroscopy system based on code modulation

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Embodiment 1

[0018] Such as figure 1 As shown, the device for improving the signal-to-noise ratio of a fast terahertz spectroscopy system based on coded modulation in this embodiment includes a femtosecond laser 1, an optical delay line 2, a modulation bias source 3, a signal generation and acquisition processing unit 4, and a terahertz The transmitting transmission receiving unit 5 and the host computer 6, wherein the terahertz transmitting transmission receiving unit 5 is a component for terahertz signal generation, collimation, focusing and detection, including photoconductive transmitting antenna, photoconductive detecting antenna, collimating lens and focusing Lens; the femtosecond laser 1 is connected with the photoconductive transmitting antenna, and the femtosecond laser 1 is connected with the photoconductive detection antenna through the optical delay line 2, and acts as a high repetition frequency femtosecond pulse laser signal, which is used as an excitation source of the photoc...

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Abstract

The invention discloses a method and system for improving the signal-to-noise ratio of a fast terahertz spectrum system based on coded modulation. The modulation code is added to the modulation bias of the existing terahertz spectrum system to generate a terahertz signal with the modulated coded signal as a subcarrier. Hertz signal, and then generate a current signal proportional to the strength of the encoded modulated terahertz signal at the detection end. By encoding and modulating the terahertz signal, the internal correlation of the terahertz signal is increased, and its interference ability in the transmission process is improved, which can bring good coding gain without increasing the actual accumulation times, and significantly improve the signal of the system. Noise level.

Description

Technical field: [0001] The invention belongs to the technical field of terahertz spectroscopy and imaging, in particular to a method and system for improving the signal-to-noise ratio of a fast terahertz spectroscopy system based on coded modulation. Background technique: [0002] The terahertz time-domain spectroscopy system based on photoconductive antenna is the most mature terahertz spectroscopy product at present. The basic principle is: at the transmitting end, a femtosecond pulsed laser is used to excite the photoconductive antenna to generate free carriers (electron-hole pairs), and the free carriers migrate rapidly under the high bias voltage of about 100V applied to the transmitting antenna, resulting in The transient change of the current, the change period is on the sub-ps level, and then radiates a terahertz pulse with the same repetition frequency as the femtosecond laser pulse. At the detection end, the synchronous femtosecond pulse irradiates the detection ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/28G01J3/02
CPCG01J3/2823G01J3/027
Inventor 朱新勇刘永利王玉建张朝惠
Owner 青岛青源峰达太赫兹科技有限公司
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