Fredga K
Appl Opt. 1969 Feb 1;8(2):333. doi: 10.1364/AO.8.000333.
A rocket-borne spectroheliograph designed to take monochromatic pictures of the sun in the Mg II line at 2802.7 A is described in detail. The photographic system consists of a Questar telescope, a Solc type birefringent filter, and an automatic Robot camera. The double Solc filter has a spectral bandwidth of 3.5 A. The two units in the double filter have been thoroughly tested and are compared with theoretically calculated transmission curves. Two new types of linear film polarizers for the uv region have been tested and used in the filter. A temperature control unit was developed which stabilized the filter temperature in flight to within +/-0.2 degrees C. The instrument has been tested in vacuum and to the Aerobee 150 vibration specifications. It has been flown and successfully recovered three times and performed excellently during each fight.
详细描述了一种用于在2802.7埃的镁II谱线拍摄太阳单色照片的火箭携带式太阳单色光照相仪。该照相系统由一台Questar望远镜、一个索尔型双折射滤光片和一台自动机器人相机组成。双索尔滤光片的光谱带宽为3.5埃。双滤光片中的两个单元已进行了全面测试，并与理论计算的透射曲线进行了比较。测试了两种新型的用于紫外区域的线性薄膜偏振器，并将其用于滤光片。开发了一个温度控制单元，可在飞行中将滤光片温度稳定在±0.2摄氏度以内。该仪器已在真空环境下进行了测试，并符合Aerobee 150振动规格。它已进行了三次飞行并成功回收，每次飞行期间都表现出色。
