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Four-channel detection technology based method for inter-satellite displacement measurement through weak-light phase lock and device for realizing same

A four-channel detection and displacement measurement technology, applied in the field of weak light phase-locked inter-satellite displacement measurement, can solve the problem that the beam energy cannot meet the measurement needs

Active Publication Date: 2012-04-18
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the light beam energy is difficult to meet the measurement needs in the ultra-long-distance inter-satellite displacement measurement, and to provide a weak-light phase-locked inter-satellite displacement measurement method based on four-channel detection technology and a device for realizing the method

Method used

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  • Four-channel detection technology based method for inter-satellite displacement measurement through weak-light phase lock and device for realizing same
  • Four-channel detection technology based method for inter-satellite displacement measurement through weak-light phase lock and device for realizing same
  • Four-channel detection technology based method for inter-satellite displacement measurement through weak-light phase lock and device for realizing same

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specific Embodiment approach 1

[0064] Specific implementation mode one: the following combination Figure 1 to Figure 3 Describe this embodiment, a kind of weak light phase-locked inter-satellite displacement measurement method based on four-channel detection technology described in this embodiment, the method includes the following steps:

[0065] Step 1. Turn on the laser module at the target end. After the preheating process, the laser module enters a stable working state. Use a half-wave plate and a polarization beam splitter to divide the linearly polarized laser output from the laser module into two parts, one part as the target end of the return laser, denoted as L B , and the other part is used as a phase-locked laser for feedback control of the laser module, denoted as L L , phase-locked laser L L is the vertically linearly polarized laser, and the return laser L B The frequency of the phase-locked laser L L The frequencies are the same, and they are respectively denoted as v B and v L ;

[...

specific Embodiment approach 2

[0131] Specific implementation mode two: the following combination figure 1 Describe this embodiment, realize the device of a kind of weak-light phase-locked inter-satellite displacement measurement method based on the four-channel detection technology described in claim 1, it is characterized in that it includes a measurement end and a target end,

[0132] The measuring end includes a dual longitudinal mode laser module 1, a frequency stabilization control module 2, a first half-wave plate 3, a first depolarizing beamsplitter prism 4, a first analyzer 5, a first high-speed photodetector 6, a first A polarization beam splitter 7, the first quarter wave plate 8, the fourth quarter wave plate 30, the sixth polarization beam splitter 31, the second analyzer 32, the sixth high-speed photodetector 33, the phase finer Sub-module 34 and displacement calculation module 35,

[0133] The target end includes a second quarter-wave plate 9, a second polarization beamsplitter prism 10, a s...

specific Embodiment approach 3

[0143] Embodiment 3: This embodiment further describes Embodiment 2. The optical phase retarder 16 is a wave plate phase retarder, a reflective phase retarder, a liquid crystal phase retarder or an electro-optical phase shifter.

[0144] The optical phase retarder 16 only phase retards the measurement laser light.

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Abstract

The invention relates to a four-channel detection technology based method for inter-satellite displacement measurement through weak-light phase locking and a device for realizing the same, belongs to the field of optics, and solves the problem that light beam energy can hardly meet the measurement requirement in the inter-satellite displacement measurement of ultralong distance. The method is used for measuring a displacement between two satellites, both of which are respectively called as a target end and a measurement end, and comprises the steps of: outputting a laser containing two longitudinal mode laser components with mutually vertical polarization states by using a double longitudinal mode laser module at the measurement end; regulating the laser and then transmitting the regulated laser to the target end as a measurement laser, and forming a reference signal Sref; after processing the measurement laser at the target end, combining the processed measurement laser with a laser transmitted by a laser module at the target end; returning a formed return laser to the measurement end; combining the return laser with the reference laser and performing frequency mixing to obtain ameasurement signal Smeas obtained through a heterodyne interferometry; and after respectively inputting the reference signal Sref and the measurement signal Smeas into a phase subdivision module, resolving the displacement of the target end relative to the measurement end according to an accumulated phase value by a displacement calculating module.

Description

technical field [0001] The invention relates to a method for measuring the displacement between weak light phase-locked stars based on four-channel detection technology and a device for realizing the method, belonging to the field of optics. Background technique [0002] From launching earth satellites to successfully landing on the moon, from exploring alien life to detecting gravitational waves in space, human exploration of space has never stopped. During this process, the inter-satellite displacement measurement technology used to monitor the motion state of the aircraft has been greatly developed. By using the laser heterodyne interferometry method, the detection distance has been extended to several million kilometers under the premise of ensuring the accuracy of micron or even nanometer. In the case of such a long detection distance, the method of passively reflecting the measurement laser at the target end used in traditional displacement and distance measurement is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/50
Inventor 胡鹏程谭久彬杨睿韬
Owner HARBIN INST OF TECH
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