LIGO的GW信號(hào)是北美電網(wǎng)啁啾(Chirps)信號(hào)嗎?

• Time-frequency and chirps, Patrick Flandrin (PDF Link)
  引用:Chirps are ubiquitous in nature and man-made systems.
  電網(wǎng)是最大的人造系統(tǒng),當(dāng)然存在各種各樣啁啾(Chirps)信號(hào)(次同步/超同步振蕩信號(hào)或其他諧波信號(hào)),而LIGO的所有文件中都沒(méi)有提到電網(wǎng)啁啾信號(hào),所以需要懷疑LIGO的GW信號(hào)是北美電網(wǎng)的啁啾信號(hào)。
  由于美國(guó)是全國(guó)聯(lián)網(wǎng)(和加拿大也聯(lián)網(wǎng)),所以可以在北美大陸的任何地方安裝帶GPS時(shí)標(biāo)連續(xù)記錄交流瞬時(shí)值波形(10kHz的采樣頻率即可)的錄波裝置(接在家里的電氣插座即可)。當(dāng)LIGO公布新的GW信號(hào)后,即查出同一時(shí)間段的記錄數(shù)據(jù),用MatLab等作FFT變換,再做小波變換,再做空間-時(shí)間shift(根據(jù)你的裝置與信號(hào)發(fā)生源之間的電氣距離換算。LIGO兩個(gè)觀測(cè)臺(tái)距信號(hào)發(fā)生源HVDC換流站的電氣距離不同,產(chǎn)生了7ms左右的時(shí)間差)。最后用你的波形與LIGO的波形比較。如果數(shù)個(gè)相互獨(dú)立的錄波裝置在同一個(gè)時(shí)間段都沒(méi)有LIGO公布的啁啾信號(hào),我們才可以確認(rèn)LIGO的GW信號(hào)不是電網(wǎng)啁啾(Chirp)信號(hào)。當(dāng)然這種裝置是多多益善。
• 引用: The gravitational waves expected to be radiated by massive astrophysical objects such as coalescing binaries.17/57
  17. Chassande-Mottin, E. and Flandrin, P. (1999). On the time-frequency detection of chirps. Appl. Comp. Harm. Anal. 6, 252{281.
  57. Schutz, B.F. (1989). Gravitational wave sources and their detectability. Class. Quant. Grav. 6, 1761{1780.
• Electric power quality, Wikipedia(LINK)
• Chirp, Wikipedia(LINK)
• Chirp spectrum, Wikipedia(LINK)
• Time–frequency analysis, Wikipedia(LINK)
• Phasor measurement unit, Wikipedia(LINK)
  PMU是一個(gè)探測(cè)電網(wǎng)基波相量的裝置,無(wú)法探測(cè)和記錄電網(wǎng)啁啾(Chirps)信號(hào)。
• Substation Noise(LINK)
• DESIGN OF NOISE CONTROL TECHNOLOGY IN SUBSTATIONS AND CONVERTER STATIONS, 鏈接斷
  找一個(gè)變電站或換流站去聽(tīng)"引力波信號(hào)"。
• High-voltage direct current, Wikipedia(LINK)
• North American power transmission grid, Wikipedia(LINK)
• Sub Synchronous Oscillations – An Introduction (LINK)
• Subsynchronous Oscillations (SSO) and PowerWorld Applications at ERCOT (LINK)