Developments of Condensation Nuclei Counter used in the Troposphere and Stratosphere : Balloon-borne Type Counter

为了测试系统的性能，我们制作了实验型CN探头，并进行了实验室实验。实验表明，实验型探头基本实现了项目初期选定的目的。1.探测极限：对1 nm左右的颗粒物的探测存在明显的不确定性，实验型探头的观测粒子数随第一个探头和第二个探头的不同而不同（两种实验型进行了比较）。然而，这两个关于几个纳米尺寸颗粒的检测数浓度之间的差异很小。2.观测项目的种类：CN粒子浓度对应的输出、电机转速/分钟、激光输出功率、腔室温度、大气温度、大气压力。3.可观测范围：本文所用的电动泵已作为光学粒子计数器的标准泵，用于监测对流层和平流层气溶胶浓度，在各个领域都取得了良好的效果。因此，可以在对流层和平流层（约35公里）操作CN探测器。CN-探测器的估计总重量在7- 8公斤之间，在世界气球使用标准的基础上，需要减少1- 2公斤的重量作为小气球使用。探测器在低温条件下的测试将在本财政年度内进行。低温试验后将确定实验型。

Experimental type of CN-sonde was made to test characteristics of the system, and we performed the laboratory experiments. The experiments suggested that the experimental type sonde had mostly realized the purpose which was chosen at beginning of the project.1.Detectable limit : There was noticeable uncertainty to detect about 1 nanometer size particles, and the number of particles observed experimental type sondes varied from first sonde to second sonde (two experimental types were compared). However, there was little difference between those two concerning detected number concentrations of several nanometer size particles. We could observed 1particles/cm3 at a few nanometer size range.2.Kinds of observation items : Out put corresponding to CN particle concentration, number of rotation of motor/minute, power of laser out put, temperature of chamber, atmospheric temperature, and atmospheric pressure.3.Observable range : Motor pump used here has been used as standard one of optical particle counter which was made to monitor tropospheric and stratospheric aerosol concentrations, and good results were obtained in various fields. Therefore it is possible to operate the CN-sonde in the troposphere and stratosphere (〜35km).4.Portability : Estimated total weight of the CN-sonde is in the range of 7-8kg, and it is necessary to reduce about 1-2kg of the weight to used as the small balloon on the basis of world standard of usage of balloon.Test of the sonde under low temperature conditions will be made within this financial year, and experimental type of the sonde will be established after the low temperature test.