Development of calibration instrument for precise stratospheric and tropospheric ozone measurement

平流层和对流层臭氧精密测量校准仪的研制

基本信息

批准号：
11680526
负责人：
KITA Kazuyuki
金额：
$ 2.5万
依托单位：
THE UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680526/
关键词：
ozone stratospheric chemistry tropospheric chemistry instrumentation 航空機観測

项目摘要

To investigate the ozone decrease in the lower stratosphere and ozone increase in the upper troposphere, the precision of the measurement should be improved significantly. It is crucial to calibrate instruments for ozone measurement under the low-pressure condition similar to the upper troposphere/lower stratosphere. For this purpose, we have developed an instrument for calibration of ozone monitor under low-pressure condition. At first, we used a commercial standard ozone generator as the ozone source and made a Teflon chamber with backward pressure controller to reduce the pressure of ozone from the ozone generator. However, the adjustment of the pressure of the chamber was difficult and critical although the pressure reduction was successful. Thus we have improved this system : 1) pressure-stabilize the inlet and exhaust ports of the ozone generator, 2) flow monitor from ozone generator, 3) some capillaries (instead of needle valve) are used to make pressure drop between ozone generator and the Teflon chamber, and so on. After these improvements, the developed calibration system worked stably. By comparing a precise ozone monitor, this ozone calibration system can calibrate a ozone measurement instrument with an accuracy of 3%. However, for using this system easily in the observation field, the operation should be automated.

为了研究平流层低层臭氧减少和对流层高层臭氧增加的情况，需要显着提高测量精度。在类似于对流层上层/平流层下层的低压条件下校准臭氧测量仪器至关重要。为此，我们开发了一种低压条件下校准臭氧监测仪的仪器。首先，我们使用商业标准臭氧发生器作为臭氧源，并制作了带有后向压力控制器的特氟龙室，以降低臭氧发生器产生的臭氧压力。然而，尽管减压成功，但腔室压力的调节却是困难且关键的。因此我们改进了该系统：1）对臭氧发生器的入口和排气口进行压力稳定，2）臭氧发生器的流量监测，3）使用一些毛细管（而不是针阀）来使臭氧发生器和臭氧发生器之间的压力下降。聚四氟乙烯室等。经过这些改进，开发的校准系统工作稳定。通过比对精确的臭氧监测仪，该臭氧校准系统可以校准臭氧测量仪器，精度为3%。然而，为了在观测领域轻松使用该系统，操作应该自动化。