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Development of a Cryogenic Infrared Camera with a Wide Field of View

宽视场低温红外相机的研制

基本信息

批准号：
07554001
负责人：
NAGATA Tetsuya
金额：
$ 4.8万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07554001/
关键词：
infrared detector wide-field optics metal mirror

项目摘要

Elemnts required for the development of the cryogenic infrared camera were divided into three categories : cryogenics, optics, and electronics. Each development is nearly completed.A cryostat with a large opening was designed and manufactured. Despite of large heat coming in from the window, the whole optics can be maintained below 80K and the detector unit below 30K,by using a closed cycle cooler. Indium seal and copper wires were employed to improve heat conduction and expel the heat from the cooler head efficiently. Cryogenic motors were made out of usual commmerical motors be changing bearings, and their tests have established their motion at the liquid nitrogen temperature.Metal mirrors were manufactured and examined. First, several small test mirrors were made : offset parabolas, parabolas of 10 cm in diameter, and spherical mirrors of 15 cm in diameter. All of them turned out to have sufficient accuracy. A Ritchey-Chretien optics was adopted as the primary and secondary mirrors. The primary (25 cm in diameter) and secondary have been designed and manufactured. Two-pieceens for aberration correction was also manufactured.Test electronics was completed and shows sufficiently low noise. MESSIA-III (National Astronomical Observatory of Japan) will be used as detector-independent part.The above three elements will be integrated, and observation of the Galactic plane with it will be started this year.

将研制低温红外相机所需的元件分为三类：低温、光学和电子学。各项研制工作已基本完成。设计并制造了大开口式低温恒温器。尽管从窗口进来的热量很大，但通过使用闭合循环冷却器，整个光学系统可以保持在80K以下，探测器单元可以保持在30K以下。采用铟封和铜丝来改善热传导，并有效地排出冷却器头部的热量。低温马达是由普通的更换轴承的马达制成的，它们的试验确定了它们在液氮温度下的运动。制造了金属反射镜并进行了检验。首先，制作了几个小的测试镜：偏置抛物线，直径10厘米的抛物线，和直径15厘米的球面反射镜。事实证明，所有这些数据都有足够的准确性。采用里奇-克雷蒂安光学元件作为主镜和次镜。设计制造了一次(直径25厘米)和二次(直径25厘米)。制作了用于像差校正的两片样机，完成了测试电子器件的制作，显示出足够低的噪声。MESIA-III(日本国家天文台)将作为与探测器无关的部分使用。这三个元素将被整合在一起，并将于今年开始用它来观测银河系平面。