THE DISASTER RELIEF AND THE ENVIRONMENTAL PROTECTION BY USING THE COIL (CHEMICAL OXYGEN-IODINE LASER)

本研究旨在建立利用COIL(化学氧碘激光)作为救灾和环境保护工具的技术里程碑。主要研究成果如下：1.研制成功了一种高压亚音速盘管。激光腔处的工作压力比以前的线圈提高了几倍，因此对真空泵容量的要求降低到五分之一。这导致线圈设备的尺寸大大减小。获得的化学效率为25%，与以前的超音速操作相当。研制了一台1kW级移动式线圈装置样机。在超音速工况下获得1343W的输出功率，在高压亚音速工况下，在6Torr的工作压力下获得1123W的输出功率。可以进一步提高操作压力，最终在12Torr下操作成功。测得比能量为3.8J/L。并进行了一小时连续运行的演示。新研制的盐捕集器运行效果良好。研究了卷材对混凝土、岩石等潜在材料的切割能力。预测的30kW级设备的切割能力为350 mm/min(沥青-100 mm厚)、260 mm/min(混凝土-100 mm厚)等。对高功率光纤传输进行了基础性实验。研究发现，现有的光纤在弯曲损耗和传输损耗方面是可行的。另一方面，连接损耗为6%，太大，不实用。测试光纤的理论极限(受激布里渊散射)大于30kW。作为上述研究的结果，我们得出结论，作为上述应用的工具，我们在线圈方面取得了重大进展，并朝着这一目标建立了一个里程碑。

This research has been done to establish the techological milestone of using COIL (chemical oxygen-iodine laser) as a tool for the disaster relief and environment protection. The obtained results are summarized as follows ;1. Development of a high-pressure subsonic operation of COIL was successful. The operating pressure at the laser cavity was increased several times compared to previous COIL's. As a result, the requirement of the vacuum pump capacity was reduced to a fifth. That results in a great size reduction for COIL devices. Obtained chemical efficiency, 25% was comparable to the previous supersonic operation.2. A 1kW-class prototype mobile COIL device was developed. Obtained output power in the supersonic operation regime was 1343W.In the high-pressure subsonic operation, 1123W was obtained at the operating pressure of 6 Torr. The operation pressure could be further increased and finally, operating at 12 Torr was successful. The obtained specific energy was 3.8J/liter. One-hour continuous operation has been demonstrated. The newly developed salt trap functioned effectively.3. Cutting capability of COIL to the potential materials, such as concrete and rock was studied. The predicted cutting capability of a 30kW-class device was 350mm/min (asphalt-100mm thick), 260mm/min (concretet-100mm thick), and so on.4. Basic experiments on the high-power optical fiber delivery were conducted. It was found that currently available fiber is viable in terms of bending loss and transmission loss. On the other hand, the connection loss was 6% and it was too large to be practical. The theoretical limit (Stimulated Brillouin Scattering) of the tested fiber was more than 30kW.As a result of above studies, we concluded that we have obtained a significant advance in the COIL as a tool of aforementioned applications, and established a milestone toward the goal.