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Method and system for improving signal-to-noise ratio of fast terahertz spectrum system based on coded 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: 2020-04-14
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 spectrum system based on coded modulation

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Embodiment 1

[0018] Such as figure 1 As shown, the signal-to-noise ratio improvement device of the fast terahertz spectroscopy system based on code 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, transmitting and receiving unit 5 and the host computer 6, wherein the terahertz transmitting and receiving unit 5 is a component for generating, collimating, focusing and detecting terahertz signals, including photoconductive transmitting antenna, photoconductive detecting antenna, collimating lens and focusing Lens: The femtosecond laser 1 is connected to the photoconductive transmitting antenna, and the femtosecond laser 1 is connected to the photoconductive detection antenna through the optical delay line 2 to generate a high-repetition frequency femtosecond pulse laser signal, which is used as the excitation source of the photoconductive ant...

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Abstract

The invention discloses a method and system for improving a signal-to-noise ratio of a fast terahertz spectrum system based on coded modulation. A modulation code is added to a modulation bias voltageof the existing terahertz spectrum system, a terahertz signal with a modulation code signal as a subcarrier is generated, and then a current signal in direct proportion to the intensity of the terahertz signal subjected to code modulation is generated at a detection end. Terahertz signals are modulated through coding, so that the intrinsic correlation of the terahertz signals is increased and theinterference capability of the terahertz signals in the transmission process is improved; a good coding gain can be brought on the premise that the actual accumulation frequency is not increased; andthe signal-to-noise ratio level of the system is remarkably improved.

Description

Technical field: [0001] The invention belongs to the technical field of terahertz spectroscopy and imaging, and particularly relates to a method and system for improving the signal-to-noise ratio of a fast terahertz spectroscopy system based on code modulation. Background technique: [0002] The terahertz time-domain spectroscopy system based on photoconductive antennas is currently the most mature terahertz spectroscopy product. 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 when the transmitting antenna is applied with a bias high voltage of about 100V. The transient change of the current has a period of sub-ps, 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 antenna to excite free ca...

Claims

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Application Information

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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