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托福词汇:引力波

2016-02-17 14:50:41来源:网络

  探测的装置是?

托福词汇:引力波

  A gravitational wave propagating orthogonally to the detector plane and linearly polarized parallel to the 4km optical cavities will have the effect of lengthening one 4km arm and shortening the other during one half-cycle of the wave; these length changes are reversed during the other half-cycle. The output photodetector records these differential cavity length variations.

  一个线性偏振、方向平行于长度为4km的光学腔体的引力波沿着垂直于探测器所在的平面传播。这将会在波的半个周期中引起其中一个4km的臂伸长,另外一个4km的臂缩短;再另外半个周期中,两臂以相反的规律变化。输出端的光探测器记录了腔体长短变化的差值。

  【重点词汇

  orthogonally 垂直的,正交的

  linearly 线性的

  polarized 偏振的,极化的

  parallel 平行的

  cavity 腔体

  half-cycle 半周

  reverse相反的

  photodetector 光探测器

  differential 差值

  variation 变化量

  Inset (a): Location and orientation of the LIGO detectors

  Inset (b): The instrument noise for each detector near the time of the signal detection; this is an amplitude spectral density, expressed in terms of equivalent gravitational-wave strain amplitude. The sensitivity is limited by photon shot noise at frequencies above 150 Hz, and by a superposition of other noise sources at lower frequencies. Narrow-band features include calibration lines (33–38, 330, and 1080 Hz), vibrational modes of suspension fibers (500 Hz and harmonics), and 60 Hz electric power grid harmonics.

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