Fiducial displacements with improved accuracy for the global network of gravitational wave detectors
Fiducial displacements with improved accuracy for the global network of gravitational wave detectors
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DOI：
10.1088/1361-6382/aba9ed
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发表时间：
2020-05
影响因子：
3.5
通讯作者：
D. Bhattacharjee;Y. Lecoeuche;S. Karki;J. Betzwieser;V. Bossilkov;S. Kandhasamy;E. Payne;R. Savage
中科院分区：
文献类型：
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作者：
D. Bhattacharjee;Y. Lecoeuche;S. Karki;J. Betzwieser;V. Bossilkov;S. Kandhasamy;E. Payne;R. Savage
随着灵敏度的提高和更多的探测器加入到全球引力波观测站网络中，校准精度和精确度变得越来越重要。光子校准器依赖于从悬挂的干涉仪光学器件反射的功率调制辅助激光束，通过生成与调制激光功率成比例的位移基准来实现连续校准。激光功率校准经由传递标准到监测调制激光功率的在线功率传感器的传播的发展已经使得能够以改进的精度生成长度基准。估计的不确定性几乎比以前报告的最低值小两倍。部分原因是方法的改进提高了对报告结果的信心。将每个观测站的激光功率校准标准参照到单个传递标准，能够减少探测器网络各元件之间的相对校准误差。国家计量研究所正在努力提高激光功率传感器的校准精度。
As sensitivities improve and more detectors are added to the global network of gravitational wave observatories, calibration accuracy and precision are becoming increasingly important. Photon calibrators, relying on power-modulated auxiliary laser beams reflecting from suspended interferometer optics, enable continuous calibration by generating displacement fiducials proportional to the modulated laser power. Developments in the propagation of laser power calibration via transfer standards to on-line power sensors monitoring the modulated laser power have enabled generation of length fiducials with improved accuracy. Estimated uncertainties are almost a factor of two smaller than the lowest values previously reported. This is partly due to improvements in methodology that have increased confidence in the results reported. Referencing the laser power calibration standards for each observatory to a single transfer standard enables reducing relative calibration errors between elements of the detector network. Efforts within the national metrology institute community to realize improved laser power sensor calibration accuracy are ongoing.