Power synthesis terahertz amplitude-stabilizing method based on phase adjustment

Abstract

The invention discloses a power synthesis terahertz amplitude-stabilizing method based on phase adjustment. The traditional intensity detector is used as amplitude detection, and a low-frequency envelope detection signal for detecting the level is used as feedback quantity to drive the phase fitness-degree adjustment between the branches of the power synthesis, thereby realizing the adjustment function of the final terahertz output amplitude. In the self-feedback and correction process, the output amplitude of the terahertz signal can be restrained by a feedback signal, so that the level amplitude of the output terahertz signal is changed to be steady to achieve the amplitude-stabilizing aim.

Description

technical field [0001] The invention belongs to the field of signal processing, and relates to a signal amplitude adjustment method, which is especially suitable for terahertz sources that require terahertz amplitude stabilization characteristics. Background technique [0002] Terahertz technology is a hotspot in current academic research, and can be applied to fields closely related to national economic and social development, such as object imaging, environmental monitoring, medical diagnosis, radio astronomy, security inspection, anti-terrorism detection, satellite communication, and radar detection. Terahertz source is one of the indispensable components. Although there are strict requirements on the output power of the terahertz source in practical applications, the actual value of the output power of the terahertz source is still not known accurately. Even if the power meter purchased from abroad, its measurement accuracy cannot be guaranteed after a long period of use...

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Problems solved by technology

At this stage, it is very difficult to obtain a terahertz signal with stable amplitude. One is that the terahertz signal is generated by a nonlinear process regardless of the optical or electrical means. Controlling its bias parameters cannot ensure that the signal is generated in a better stable state. And the monotonicity of the control function is not strong; the second is to use the attenuator for dynamic adjustment, but most of the terahertz attenuators are manually adjusted at this stage, and the response speed of a small number of electronically adjustable attenuators that have been reported are all on the sub-second level. Unable to meet the needs of rapid amplitude adjustment

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