Development of a cryogenic air sampling system for unmanned aircraft observation.
开发用于无人机观测的低温空气采样系统。
基本信息
- 批准号:07558076
- 负责人:
- 金额:$ 8.9万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (A)
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 1997
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In order to clarify distributions and variations of atmospheric trace gases in the stratosphere using an unmanned aircraft, it is necessary to develop a small and light weight air sampling system. For this purpose, we developed and tested a new cryogenic air sampler using neon Joule-Thomson (JT) cooler. The results are summarized as follows :1. An refrigeration capacity of neon JT cooler was experimentally determined. The results showed that the neon JT cooler produced refrigeration of about 23 Joule/second at neon gas pressure of 130 kgf/cm^2 and of nearly zero at 50 kgf/cm^2. It was also confirmed that the neon gas was liquefied after 50 to 150 seconds of the neon gas introduction.2. Low pressure nitrogen was introduced into a new cryogenic air sampling system in which the JT cooler was equipped, and sampling rate of nitrogen were measured. the sampling rate was between 0.7 and 1.0 normal litter/minutes at nitrogen pressure of 100 hPa and between 0.3 and 0.7 normal litter/minutes at 5 hPa. these results indicate that it is necessary to increase the sampling rate to realize a practical sampling system.3. To examine the composition of air after sampled by the cryogenic sampling system, an air-base standard gas, of which methan concentration was already determined, were introduced into the sampling system and sampled cryogenically. As a result, the methan concentration of the sample was confirmed to be identical to that of the standard gas within the measurement precision.4. A high conductance valve system was successfully developed using a pipe breaking cutter, cold weld and N-S joint techniques. Because the valve system was composed only by straight tubes, high conductance was easily attained even if relatively thin tube was used.
为了利用无人机了解大气中痕量气体在平流层中的分布和变化,有必要开发一种小而轻的空气采样系统。为此,我们研制并测试了一种使用霓虹焦耳-汤姆逊(JT)制冷器的新型低温空气采样器。主要研究结果如下:1.对霓虹灯JT制冷机的制冷量进行了实验测定。结果表明,在Ne气压为130kgf/cm2时,Ne JT制冷器的制冷量约为23焦耳/秒,而在50kgF/cm2时,制冷量几乎为零。此外,还证实了在Ne气体引入50~150秒后,Ne气体发生了液化。将低压氮气引入到装有JT冷却器的新型低温空气采样系统中,测量了氮气的采样率。在氮气压力为100百帕时,采样速率为0.7~1.0标准凋落物/分钟;在5百帕时,采样速率为0.3~0.7标准凋落物/分钟。这些结果表明,要实现实用的采样系统,有必要提高采样率。为了检测经低温采样系统采样后的空气成分,将已确定甲烷浓度的气基标准气体引入采样系统进行低温采样。结果表明,在测量精度范围内,样品的甲烷浓度与标准气体的浓度一致。采用断管切割器、冷焊和N-S接头技术,研制成功了一种高电导阀门系统。由于阀门系统只由直管组成,即使使用较薄的管也很容易获得高电导。
项目成果
期刊论文数量(14)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Honda,H. et al.: "Cryogenic sampling system for measurements of the concentrations of storatospheric trace gases and their isotopic rations over Antarctica." J.Geomag.Geoelec.48. 1145-1155 (1996)
本田,H.
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Honda, H.et al.: "A newly developed grab sampling system for collecting storatospheric air over Antarctic" Antarctic Record. 40. 156-168 (1996)
Honda, H.et al.:“一种新开发的抓取采样系统,用于收集南极上空的平流层空气”《南极记录》。
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Yamanouchi,T.: "Report of atmospheric science observations at Ny-Ålesund,Svalbard" Mem.Natl Inst.Polar Res.,Spec.Issue. 51(未定). (1996)
Yamanouchi, T.:“斯瓦尔巴群岛 Ny-Ålesund 大气科学观测报告”Mem.Natl Inst.Polar Res.,Spec.Issue 51(待定)。
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Yamanouchi, T.et al.: "A future plan for atomspheric observations using unmanned aircraft" Proc.Polar.Meteorol.Glaciol. 11. 257 (1997)
Yamanouchi, T.et al.:“使用无人机进行原子层观测的未来计划”Proc.Polar.Meteorol.Glaciol。
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T.Yamanouchi et al.: "A Future Plan for Atmospheric Observations using Uumanned Aircraft" Proc.NIPR Symp.Polar Meteol.Glaciol.11(in press). (1997)
T.Yamanouchi 等人:“使用无人机进行大气观测的未来计划”Proc.NIPR Symp.Polar Meteol.Glaciol.11(印刷中)。
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