Two-way femtosecond pulse high-precision displacement detection method and device

Abstract

The invention provides a high-precision displacement detection method and device of two-way femtosecond pulses, and belongs to the field of gravitational-wave detection. According to the method, a pulse time-domain locking type two-way measurement structure is adopted, system light return power is changed into a square attenuation function of measured distance from a quadruplicate attenuation function of the measured distance, dynamic displacement detection on the ultra-long distance over hundreds of millions of kilometer scale is achieved, and sub-nanometer displacement detection sensitivity is achieved through optical delay line scanning. The device comprises a measuring-terminal femtosecond laser, a measuring-terminal spectral optical path, a measuring-terminal balanced photoelectric detection unit, a measuring-terminal control unit, an optical delay line scanning unit, a measured-terminal femtosecond laser, a measured-terminal spectral optical path, a measured-terminal balanced photoelectric detection unit and a measured-terminal control unit, a measuring terminal and a measured terminal are relatively independent, and the real-time communication and high-precision time synchronization problems of satellites which are distant from one another are avoided.

Description

technical field [0001] The invention belongs to the field of gravitational wave detection, and mainly relates to an ultra-long-distance high-precision femtosecond laser pulse displacement detection method and device. Background technique [0002] For many years, the detection of gravitational waves has been a research hotspot all over the world. The detection of gravitational waves is a direct verification of the predictions of general relativity and a direct test of its core ideas. The origin and evolution of the universe is of great significance. The detection of gravitational waves directly contributed to the birth of gravitational wave astronomy, making it possible to observe the universe with gravitational waves instead of traditional electromagnetic wave means, which can provide us with a large amount of information that could not be obtained in the past, and provide a new way for people to further deepen their understanding of the universe. way. [0003] Long-distan...

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Problems solved by technology

[0010] Aiming at the problems of low detection sensitivity of the above-mentioned method and device, further improvement of measurement range, inability to measure dynamic targets, and difficulty in realizing real-time communication and high-precision clock synchronization between two distant measurement terminals, the present invention proposes and designs a Two-way femtosecond pulse high-precision displacement detection method and device

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