两种校准器的故事：高级LIGO第三次观测运行后牛顿校准器与光子校准器的比较
A Tale of Two Calibrators: Comparing Newtonian and Photon Calibration in Advanced LIGO after the Third Observing Run
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中文总结 AI 辅助
该研究对比了高级LIGO第三次观测运行后的NCal与PCal两种校准系统，发现二者应变振幅比值相差约1%，强调需维护多个独立校准参考以验证LIGO的校准。
中文摘要 AI 辅助
LIGO的应变读出精确校准对从引力波探测中提取信息至关重要。本文对两种独立的直接力校准方法——牛顿校准器（NCal）和光子校准器（PCal）系统——进行了对比分析。目前LIGO仅依赖PCal系统作为其绝对校准参考。为便于对比，在第三次观测运行结束后，我们在LIGO汉福德天文台使用NCal和PCal系统进行了一系列直接力注入实验。我们计算了每次注入的实测应变振幅与预期应变振幅的比值。在30赫兹频带的每个注入频率上，NCal和PCal的比值相差约1%，表明两个系统间存在微小的系统偏差。这一差异凸显了维护多个独立校准参考以验证LIGO校准的重要性。
英文摘要
Precise calibration of LIGO's strain readout plays a vital role in our ability to extract information from gravitational-wave detections. We present a comparative analysis of two independent direct-force calibration methods: the Newtonian Calibrator (NCal) and Photon Calibrator (PCal) systems. Currently, LIGO relies solely on the PCal system as its absolute calibration reference. To facilitate comparison, a series of direct-force injections were performed using the NCal and PCal systems at the LIGO Hanford observatory just after the completion of the third observing run. We compute the ratio of the measured to expected strain amplitudes for every injection. For each injection frequency across a 30 Hz band, the ratios of NCal and PCal differ by $\sim$0.5-1%, demonstrating a small systematic difference between the two systems. This offset highlights the importance of maintaining multiple independent calibration references to validate LIGO's calibration.
发表机构
- The Australian National University（澳大利亚国立大学）
- University of Washington（华盛顿大学）
- LIGO Hanford Observatory（LIGO汉福德天文台）
- LIGO Livingston Observatory（LIGO利文斯顿天文台）
- Missouri Institute of Science and Technology（密苏里科技大学）
- Kenyon College（肯扬学院）
机构由 AI 辅助整理，请以论文原文为准。
