使用漂移扫描成像的高节奏光学瞬态成像技术III：廉价驱动控制系统的开发以及驱动系统周期性误差的表征和校正
High Cadence Optical Transient Searches using Drift Scan Imaging III: Development of an Inexpensive Drive Control System and Characterisation and Correction of Drive System Periodic Errors
摘要：
为了进一步开发和实施新的漂移扫描成像实验，以进行宽视场，高时间分辨率的毫秒光学瞬变测量，需要一个合适的望远镜驱动系统。本文介绍了一种简单而廉价的硬件和软件系统的开发，以监测，消除和纠正望远镜驱动误差的主要类别，由于在驱动和齿轮链的缺陷周期性错误。的周期性错误的模型产生的望远镜驱动轴旋转的直接测量，通过比较天文测量的周期性错误进行验证。生成预测模型，并以驱动速率校正的形式实时应用。系统的演示表明，峰-峰幅度~ 100“的固有周期误差被减小到~ 3”的视宁度极限以下。该演示允许对Tingay & Joubert（2021）原型调查的瞬态灵敏度时标的不确定性进行估计，将标称时标灵敏度21 ms修订为20 - 22 ms，这不会显著影响实验结果。该校正系统将用于正在建设中的高节奏成像实验的最终版本。该校正系统价格低廉（<100美元），由容易获得的硬件组成，并且容易适应其他应用。因此，设计细节和代码是公开的。
英文摘要：
In order to further develop and implement novel drift scan imaging experiments to undertake wide field, high time resolution surveys for millisecond optical transients, an appropriate telescope drive system is required. This paper describes the development of a simple and inexpensive hardware and software system to monitor, characterise, and correct the primary category of telescope drive errors, periodic errors due to imperfections in the drive and gear chain. A model for the periodic errors is generated from direct measurements of the telescope drive shaft rotation, verified by comparison to astronomical measurements of the periodic errors. The predictive model is generated and applied in real-time in the form of corrections to the drive rate. A demonstration of the system shows that that inherent periodic errors of peak-to-peak amplitude ~100'' are reduced to below the seeing limit of ~3''. This demonstration allowed an estimate of the uncertainties on the transient sensitivity timescales of the prototype survey of Tingay & Joubert (2021), with the nominal timescale sensitivity of 21 ms revised to be in the range of 20 - 22 ms, which does not significantly affect the results of the experiment. The correction system will be adopted into the final version of high cadence imaging experiment, which is currently under construction. The correction system is inexpensive (<$A100) and composed of readily available hardware, and is readily adaptable to other applications. Design details and codes are therefore made publicly available.
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