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Gravitational wave detecting method based on pseudo random encoding technique

A pseudo-random coding and detection method technology, applied in the direction of measuring gravitational field, measuring device, geophysical measurement, etc., can solve the problems of high operating cost, increased cost, low cost performance of antenna quality, etc., and achieve the level of easy measurement, antenna thermal noise The effect of level reduction

Inactive Publication Date: 2019-03-15
JILIN UNIV
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Problems solved by technology

[0006] 2) The antenna works at the temperature of liquid helium. It is difficult to guarantee the energy conversion characteristics of general sensors (such as optical fiber sensors) at such a low temperature. Sensitization measures can only be taken such as (increasing the quality of the antenna, etc.) which are not cost-effective;
[0007] 3) The additional cooling device brings technical difficulties to the construction and operation of the system and leads to a substantial increase in costs
Taking the MiniGARIL system as an example, it takes 40 days for the gravitational wave antenna to cool from normal temperature to the predetermined 0.1k. Its complicated technical support and high operating costs make the IGEC observatory only run intermittently

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  • Gravitational wave detecting method based on pseudo random encoding technique
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  • Gravitational wave detecting method based on pseudo random encoding technique

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Embodiment 1

[0030] Mass resonance method based on pseudo-random coding technology to detect gravitational waves The laser interferometric phase demodulator (including laser), gravitational wave resonant rod antenna and fiber sensing arm wound on it, coupler, fiber reference arm, etc. constitute the laser Interferometric vibration measurement systems such as Figure 4 shown;

[0031] Among them, the gravitational wave resonant rod antenna design:

[0032] Input design conditions: the mass range of the resonator is 100kg to 300kg, the mass body material options are pure aluminum, aluminum alloy, copper aluminum alloy CuAl6%, and the shape options are rod shape, tube shape, and spindle shape. Taking the resonant frequency point 220Hz (35Hz, 100Hz, 250kHz) as the constraint condition, and taking the reference index (3dB bandwidth ≥ 0.5%, Q value ≥ 1000, larger gravitational wave interception area, larger structural sensitization effect) as the evaluation basis , complete the gravitational w...

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Abstract

The invention discloses a gravitational wave detecting method based on a pseudo random encoding technique. A pseudo random encoded laser beam is used for assisting in irradiation to a normal-temperature gravitational wave antenna, resonance having pseudo code characteristics can be formed when the light pressure of encoding laser conforms to the frequency / phase of gravitational wave pressure signals in a detection antenna, and accordingly the capability of detecting weak gravitational wave vibration under the thermal noise background is remarkably improved. Compared with a large resonance rodantenna, huge construction and operation cost for cooling to liquid helium temperature and the brought thermal noise level of the antenna by 2-4 orders of magnitude are reduced. The signal-to-noise ratio gain of 10 orders of magnitude is brought with relatively low cost through a pseudo random technique, and gravitational waves can be increased to the orders of magnitude of 10-4 to 10-5 g, so thatthe measurement level is easily achieved.

Description

technical field [0001] The invention relates to the technical field of gravitational wave detection, in particular to a gravitational wave detection method based on pseudo-random coding technology. Background technique [0002] The essence of gravitational wave detection technology is to detect extremely weak vibration signals submerged in various noises. There are mainly two technical routes of "mass resonance method" and "laser interferometry". [0003] The sensitivity of the mass resonance method is not inferior to the laser interferometry measurement system, and it is even possible to compare with the improved Advanced LIGO. Its disadvantage is that the measurement bandwidth (a dozen Hz) is smaller than that of the laser interferometry (hundreds of Hz). At present, the biggest challenge to the "mass resonance method" is how to solve the thermal noise problem of molecular motion of antenna materials. The molecular thermal motion noise of the antenna material not only sub...

Claims

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Application Information

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IPC IPC(8): G01V7/00
CPCG01V7/00
Inventor 仲志成林君韩雪刘奎元
Owner JILIN UNIV
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