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Towards in-situ monitoring of tapestry degradation using strain-based engineering techniques

使用基于应变的工程技术对挂毯退化进行现场监测

基本信息

批准号：
AH/D001404/1
负责人：
Frances Lennard
金额：
$ 49.28万
依托单位：
University of Southampton
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2007
资助国家：
英国
起止时间：
2007 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=AH%2FD001404%2F1
关键词：
Towards situ monitoring tapestry degradation

项目摘要

Tapestries are large and heavy and damage may be caused while they are on continuous display, not only because of their sensitivity to the environment but also through the stress imposed by their own weight. This load becomes more significant as the tapestry ages and its component materials degrade. The effects of deformation under a constant load are well understood within engineering and procedures exist for monitoring deformation. Applying engineering techniques to the monitoring of damage caused by hanging tapestries would enable areas of degradation to be identified before it is apparent that damage is occurring. Such monitoring would allow the optimum time for conservation treatment to be predicted and different methods of treatment to be quantitatively evaluated. It would help to ensure that funding available for conservation is used most effectively. The work would have wider applications for the treatment of other textiles. Although such techniques have recently been applied in the cultural heritage sector, this remains a small and pioneering field and these techniques have not been applied to tapestry conservation. The interdisciplinary research team at the University of Southampton, consisting of researchers from the Textile Conservation Centre (TCC) and the School of Engineering Sciences, has completed a pilot study investigating a number of possible techniques for monitoring tapestries. The work examined contact and non-contact techniques, including optical fibre strain gauges, electronic speckle pattern shearing interferometry (ESPSI), thermography and photoelasticity. The results of the pilot study indicated that optical fibres can be attached directly to a tapestry-like material and that the strain is transferred to the sensors. Optical fibres are the most suitable permanent monitoring device for monitoring the strain locally. The study also showed that 3-D photogrammetry using digital image correlation is the most suitable technique for whole-field monitoring, allowing the entire tapestry to be monitored quickly and without direct contact. The two techniques would be used in tandem, the fibre-optic sensors acting as a reference to validate the data from the photogrammetry technique.The current proposal is aimed at developing these techniques into a hybrid system which can be used to monitor tapestries in-situ. A post-doctoral researcher will take responsibility for developing the application of the optical fibres, while a PhD student will develop the photogrammetry technique. The major challenge will be to apply the two techniques together so that strain readings from the optical fibres provide calibration for the photogrammetry. The final stage of the project will be to apply the methodology to both a custom-woven tapestry incorporating optical fibres in its structure and to a historic tapestry belonging to one of the project partners, Historic Royal Palaces, English Heritage or the National Trust. The successful result will be a fully operational monitoring system that can be installed unobtrusively in a historic house environment. The optical fibre component will be hidden from view. The photogrammetry equipment will be portable so that it can be introduced for periodic testing and then removed.The three investigators, Frances Lennard, Dr Janice Barton and Dr Alan Chambers, will manage the project with Dinah Eastop, Senior Lecturer TCC, and Associate Director of the AHRC Research Centre for Textile Conservation and Textile Studies, the fourth member of the current project team. An advisory panel made up of representatives from the heritage field and other researchers will provide additional support.

挂毯又大又重，在连续展出时可能会造成损坏，这不仅是因为它们对环境敏感，也是因为它们本身的重量所施加的压力。随着挂毯的老化和其组件材料的退化，这种负载变得更加明显。在恒定载荷下变形的影响在工程中是很好理解的，并且有监测变形的程序。将工程技术应用于监测悬挂挂毯造成的损害，将能够在损害明显发生之前查明退化的区域。这种监测将能够预测养护治疗的最佳时间，并对不同的治疗方法进行定量评估。这将有助于确保可用于保护的资金得到最有效的利用。这项工作将在其他纺织品的处理中得到更广泛的应用。虽然最近在文化遗产部门应用了这种技术，但这仍然是一个小而开创性的领域，这些技术还没有被应用于织锦保护。由纺织保护中心(TCC)和工程科学学院的研究人员组成的南安普顿大学跨学科研究小组已经完成了一项初步研究，调查了一些可能的挂毯监测技术。这项工作检查了接触和非接触技术，包括光纤应变计、电子散斑图案剪切干涉测量(ESPSI)、热成像和光弹性。初步研究的结果表明，光纤可以直接连接到挂毯状材料上，并将应变传递给传感器。光纤是最适合用来监测局部应变的永久性监测装置。研究还表明，使用数字图像相关的三维摄影测量是最适合全场监测的技术，可以快速且不直接接触地监测整个挂毯。这两种技术将被串联使用，光纤传感器作为参考，验证摄影测量技术的数据。目前的提议旨在将这些技术发展成一种混合系统，可用于现场监测挂毯。一名博士后研究人员将负责开发光纤的应用，而一名博士生将开发摄影测量技术。主要的挑战将是同时应用这两种技术，以便光纤的应变读数为摄影测量提供校准。该项目的最后阶段将是将该方法应用于在其结构中加入光纤的定制编织挂毯和属于项目合作伙伴之一的历史挂毯--历史皇家宫殿、英国遗产或国家信托基金。成功的结果将是一个完全可操作的监控系统，可以不引人注目地安装在历史悠久的房屋环境中。光纤组件将隐藏在视线之外。摄影测量设备将是便携式的，这样它就可以被引入进行定期测试，然后再被移除。三名调查人员France Lennard、Janice Barton博士和Alan Chambers博士将与TCC高级讲师Dinah Eastop和AHRC纺织品保护和纺织研究研究中心副主任Dinah Eastop一起管理该项目，Dinah Eastop是目前项目团队的第四名成员。一个由遗产领域代表和其他研究人员组成的咨询小组将提供额外的支持。