Development of Dew-Point-Sonde without CFCs

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Dew-point-sonde which has been used for routine observation of upper atmospheric water vapor is now inhibited to use since this type sonde contains CFCs to cool mirror surface. Therefore there are few data on water vapor content of the stratosphere although information on stratospheric water vapor is important to do accurate weather forcast. During this project, we discussed and summarized technical points as follow to develope the new-type dew (frost) point sonde which had non-CFCs.According to laboratory experiment, following points can be concluded ;1.Optical systems with semiconductor laser and Si-photo diode was very effective to detect dew droplets on mirror surfaceand depolarization changes in scattering light from the droplets.2.Proto type sonde was made and handing efficinecy was tested. The results of experiments showed that quality controle of mirror surface is very important, and total weight of sonde including buttery decreased comparing the value of traditional type sonde owing to weight increase of optical system which used to detect polarization properties of scattering light. In conclusion, dew (frost) point zonde which is used for upper atmospheric water vapor is practically hopeful.