講演情報
[PEM15-P10]TromsoのNa lidarに用いる昼間観測と熱圏観測のための超狭帯域フィルタの開発(3)
*川原 琢也1、野澤 悟徳2、斎藤 徳人3、津田 卓雄4、川端 哲也2、和田 智之3、高橋 透5 (1.信州大学工学部、2.名古屋大学宇宙地球環境研究所、3.理化学研究所光量子工学研究センター、4.電気通信大学、5.国立研究開発法人 海上・港湾・航空技術研究所 電子航法研究所)
キーワード：
ナトリウムライダー、磁気光学フィルタ
An ultra-narrowband magneto-optical filter, also called a Faraday dispersive filter, is being developed for the Na LIDAR receiver in Tromsø to enable thermonspheric observations and daytime observations in sunlit conditions. The filter consists of a heated Na cell between two crossed polarizers in a strong magnetic field, producing a transmission profile.
Currently, the following stages of development are underway:
1. A new Faraday filter is being built for the new lidar receiver. Its transmission profiles are being measured at RIKEN with a high resolution of a few MHz under different cell temperatures with magnetic fields of 170 mT. The measured transmission profiles are being compared with theoretical ones for validation.
2. A new sapphire cell is being developed for LIDAR daytime measurements. Commercially available glass-type Na cells corrode at high temperatures of over 150°C due to chemically active high-temperature Na atoms in the cell.
3. A thermal stability test of the transmission profiles has been conducted, assuming long-term observation. The filter transmission during observation is required for data analysis, so the transmission needs to be measured between observations.
Discussions on these topics are presented in the talk.
Currently, the following stages of development are underway:
1. A new Faraday filter is being built for the new lidar receiver. Its transmission profiles are being measured at RIKEN with a high resolution of a few MHz under different cell temperatures with magnetic fields of 170 mT. The measured transmission profiles are being compared with theoretical ones for validation.
2. A new sapphire cell is being developed for LIDAR daytime measurements. Commercially available glass-type Na cells corrode at high temperatures of over 150°C due to chemically active high-temperature Na atoms in the cell.
3. A thermal stability test of the transmission profiles has been conducted, assuming long-term observation. The filter transmission during observation is required for data analysis, so the transmission needs to be measured between observations.
Discussions on these topics are presented in the talk.