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Laser sail attitude measuring device based on Cavendish torsion balance

A measuring device and laser technology, applied in the field of laser sails, can solve problems such as affecting sailing stability, achieve good stability and repeatability, and eliminate noise.

Pending Publication Date: 2021-12-24
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is a challenge to accurately measure the motion attitude of the laser sail, which directly affects the prediction and regulation of its sailing stability and other performance

Method used

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  • Laser sail attitude measuring device based on Cavendish torsion balance
  • Laser sail attitude measuring device based on Cavendish torsion balance
  • Laser sail attitude measuring device based on Cavendish torsion balance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The materials used and their parameters are as follows: the suspension wire is tungsten wire, the diameter d 30μm, length L 5.1cm, torsion coefficient G It is 36GPa; the laser sail is a square with a side length of 10cm, and the surface is made of PET aluminized film. R About 0.9, equivalent force arm l 3.5cm; the vacuum box is made of acrylic material, the size is 36cm*36cm*36cm in outer diameter, 30cm*30cm*30cm in inner diameter, 3cm in thickness, and the ultimate vacuum is -29.5inhg; the driving laser power is 10w, and the effective power P is 8.48w, the wavelength is 450nm, and the incident angle θ 90°; positioning laser power 20mw; reflection distance W It is 144.5cm.

[0028] The operation steps of the device are as follows:

[0029] (1) Adjust the distance between the aluminum block and the magnet so that it can better suppress the vibration of the laser sail without affecting the deflection of the laser sail. Close the vacuum box and draw a vacuum using ...

Embodiment 2

[0036] Suspension wire is tungsten wire, diameter d 30μm, length L 12.0cm, torsion coefficient G It is 36 GPa; the laser sail is a square with a side length of 10cm, and the surface is made of PET aluminized film. R About 0.9, equivalent force arm l 4.0 cm; the vacuum box is made of acrylic material, the size is 36cm*36cm*36cm in outer diameter, 30cm*30cm*30cm in inner diameter, 3cm in thickness, and the ultimate vacuum is -29.5inhg; the laser power is 10w, and the effective power P is 8.48w, the wavelength is 450 nm, and the incident angle θ 90°; positioning laser power 20mw; reflection distance W It is 284.5cm.

[0037] Repeating the operation steps of Example 1, the experimental value of the spot shift is about 44.8 cm, and the calculated theoretical value is 51.3 cm, and the error between the two is 12.7%.

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Abstract

The invention belongs to the technical field of laser sails, and relates to a laser sail attitude measuring device based on a Cavendish torsion balance. The laser sail attitude measuring device comprises a vacuum box, a laser sail, a tungsten filament, a magnet sheet, aluminum blockS, a positioning laser source, a driving laser source, a fan, an aluminum frame and a graduated scale; the laser sail is connected with one end of the tungsten filament and is hung in the vacuum box; the magnet sheet and the two aluminum blocks form electromagnetic damping and are arranged on the two sides of the laser sail; the driving laser source is used for emitting driving laser to the laser sail; and the positioning laser source is used for emitting positioning laser to the laser sail; the other end of the tungsten filament is fixed on the aluminum frame; the graduated scale is arranged on a reflection light path of the laser sail; and the fan is installed at the rear end of the driving laser and used for conducting air cooling treatment on the driving laser. Deflection motion generated by the laser sail under excitation of laser light pressure can be accurately measured, most noise in an experiment is eliminated by adding electromagnetic damping, and good stability and repeatability are achieved.

Description

technical field [0001] The invention belongs to the technical field of laser sails, and in particular relates to a laser sail attitude measuring device. Background technique [0002] In the mid-19th century, Maxwell predicted the existence of light pressure theoretically. At the beginning of the 20th century, Lebedev measured the value of light pressure experimentally for the first time, which led to the scientific idea of ​​light pressure-driven space navigation. In 2010, the Japanese Space Agency JAXA successfully launched the IKAROS laser sail into space and successfully completed various experiments, which further stimulated people's enthusiasm for research on laser sail spacecraft. In 2016, Hawking proposed the "Breakthrough Starshot" (Breakthrough Starshot) plan, which aims to use the huge light pressure generated by the laser array on the ground to accelerate the laser sail to 20% of the speed of light to achieve interstellar navigation, target the stars and seas, an...

Claims

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Application Information

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IPC IPC(8): G01B11/02G01B11/26
CPCG01B11/02G01B11/26
Inventor 徐凡刘俊廷杨易凡程柘张晓亮汪婷
Owner FUDAN UNIV