Phase coating on roof prism serves mainly for reducing interruption of light inside roof prism and thus enhance acutance of images 在屋脊棱镜上镀制相位膜，其主要目的是为了减小屋脊镜内光波的干涉，增加影像锐度。
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Based on the strain history information obtained from monitoring of bridge operation state , and through detailed analysis of influential line shapes of measurement points on the bridge , a bwim ( bridge weight in motion ) method , the single - acme acutance method that can identify passing vehicle load , is established 摘要基于桥梁运营状态监测得到的应变历程数据，通过对测点影响线形状的较深入分析，建立了识别过桥车辆荷载的一种bwim方法“单峰锐度法” 。
