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首页> 外文期刊>Journal of Imaging Science and Technology >Effects of Energetic Polymers on Laser Photothermal Imaging Materials
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Effects of Energetic Polymers on Laser Photothermal Imaging Materials

机译：高能聚合物对激光光热成像材料的影响

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摘要

The effects of adding a thin layer of an energetic polymer such as nitrocellulose (NC) to laser photothermal imaging media are investigated. Photothermal media are used which are model systems for computer-to-plate or computer-to-press imaging. The media consist of a substrate, a thin absorbing metallic absorbing layer and a silicone rubber imaging layer. An energetic polymer can be added between the substrate and the absorber. With 10 μs duration near-IR exposure pulses, the energetic layer has no discernable effect. With 110 ns imaging pulses, exposed spots in imaging media with energetic underlayers can be more than three times larger. The improvement due to energetic polymers results from confining the hot gas-phase thermochemical decomposition products under the silicone layer, as shown by time-resolved microscopy The force exerted by the expanding bubble tears the neck of the bubble away from the substrate, increasing the imaged spot size. These rather complicated processes cannot be described by previously used simple exposure threshold models. An exposure parameter is introduced which deals with this problem. In some cases energetic material underlayers can improve the sensitivity of the media by a factor of three. This work is believed to be the first where a substantial sensitivity improvement in laser threshold for photothermal imaging is obtained with energetic polymers.
机译：研究了向激光光热成像介质中添加一层薄薄的含能聚合物（例如硝化纤维素（NC））的效果。使用光热介质，该光热介质是用于计算机制版或计算机印刷成像的模型系统。介质由基材，薄吸收金属吸收层和硅橡胶成像层组成。可以在基材和吸收剂之间添加高能聚合物。对于持续时间为10μs的近红外曝光脉冲，高能层没有明显的影响。使用110 ns的成像脉冲，具有高能量底层的成像介质中的裸露斑点可以大三倍以上。高能聚合物的改善是由于将热气相热化学分解产物限制在有机硅层之下，如时间分辨显微镜所示。膨胀气泡所施加的力将气泡的颈部从基材上撕开，从而增加了成像的质量。斑点大小。这些相当复杂的过程无法通过以前使用的简单暴露阈值模型来描述。引入了一个曝光参数来解决这个问题。在某些情况下，高能材料底层可以将介质的灵敏度提高三倍。据信这项工作是首次用高能聚合物大大提高了光热成像激光阈值的灵敏度。

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