Acta Scientiarum Naturalium Universitatis Pekinensis
CHEN Shaoguang1, LIU Baocheng2
According to c=νλ , the test theories of special relativity in common version will not be harmonious, in which the inferred phase difference is deduced by the optical path difference of anisotropic light speed c , while the inference is based on the isotropy of frequency ν and wavelength λ . A new version of the Doppler effect of absolute velocity V can avoid the theory contradicting itself. The test theories of Robertson and Mansouri Sexl are based on the isotropy of wavelength just as the classical aether theory does. Because unit of length (“meter”) changes with direction for wavelength being anisotropy, the resonant condition of laser is satisfied in one direction but not in other directions, which makes the test experiments very difficult to design. The test theories of Robertson and Mansouri Sexl all assume that the velocity of light is independent of motion of the source to ensure isotropy of the wavelength. If wavelength is invariable in direction, the anisotropy of twoway speed of the light will accompany the frequency anisotropy of return light beams. Because the Doppler frequency shifts are different for longitudinal and transverse absolute velocities of the apparatus relative to the preferred reference frame Σ , the frequency anisotropy of return light beams occurs on the process of reflecting. We obtain the conclusion:usual MichelsonMorley experiment just examined the frequency anisotropy of return light beams, which can be carried out by the beat frequency method. By means of the heterodyne frequency shift technique and the computer storage technique, the sensitivity of beat frequency is limited only by the noise. By means of common mode restraint technique the error caused by frequency instability of light source can be decreased to the level of 1/104 Hz. The isotropy of twoway speed of light can be tested to the precision of 1/1018 in Δ c/c , which will represent a 1 000-fold improvement on the previous best measurement given by Brillet and Hall.
two-way speed of light,
Doppler effect of absolute velocity,
laser heterodyne frequency shift,
common mode restraint
CHEN Shaoguang,LIU Baocheng. A New Method for Inspect Spatial Isotropy[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.
陈绍光,刘宝诚 . 检验空间各向同性的新方法[J]. 北京大学学报（自然科学版）.
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