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Relay femtosecond pulse high-precision displacement detection method

A technology of femtosecond pulse and detection method, which is applied in the field of gravitational wave detection, can solve the problems of low precision, difficulty in realizing real-time communication, and the need for further improvement of measurement range, and achieve the effect of avoiding real-time communication and high-precision clock synchronization

Active Publication Date: 2018-05-15
HARBIN INST OF TECH
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Problems solved by technology

[0010] The present invention proposes and designs a relay type for the problems of low accuracy of the above method, 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. Femtosecond pulse high-precision displacement detection method

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Embodiment Construction

[0024] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] The relay-type femtosecond pulse high-precision displacement detection method of this embodiment, figure 1 It is a schematic diagram of the principle, and the steps of the method are as follows:

[0026] a, at the measurement end, the femtosecond laser pulse sequence sent by the femtosecond laser 11 has a wavelength λ of 1550nm; the pulse repetition frequency f is 100MHz; the pulse period T is 10 -8 s; pulse width w is 10fs. The light beam is divided into two beams after passing through the No. 1 polarizing beam splitter 5, and the transmitted beam is used as the measurement signal A, denoted as S ma , transmitted to the No. 1 femtosecond phase-locked repeater 6, and the reflected beam is used as a reference signal, denoted as S r , shoot to the reflector 2 and return along the original optical path, and then pass through the No. 1 polarizing...

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Abstract

The invention discloses a relay-type femtosecond pulse high-precision displacement detection method, and belongs to the field of gravitational wave detection. The method employs a relay measurement structure of a pulse time domain locking type, amplifies the light power of measured light through the cascading of three femtosecond phase-locking relays, enables the return light power of a system to be changed into a square attenuation function from a quadruplicate attenuation function of a measured distance, and achieves the over-distance dynamic displacement detection of the scale of an outer solar system. The method achieves the sub-nanometer level displacement detection sensitivity through light delay line scanning. A measurement end and the three femtosecond phase-locking relays are independent of each other, and the method solves a problem of real-time communication and high-precision clock synchronization among satellites which are remotely separated from each other.

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 in the outer solar system. 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. [00...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/02
CPCG01B11/02
Inventor 于亮胡鹏程谭久彬
Owner HARBIN INST OF TECH
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