Udaipur太阳天文台多用途太阳望远镜的窄带成像系统：铌酸锂标准具的特性
Narrow-Band Imaging System for the Multi-application Solar Telescope at Udaipur Solar Observatory: Characterization of Lithium Niobate Etalons
摘要：
多用途太阳望远镜是一台50厘米离轴格里高利望远镜，安装在乌代布尔太阳观测站的湖边。为了准同时进行光球和色球观测，研制了一台窄带成像仪，作为该望远镜的后端仪器之一。窄带成像是使用两个锂酸盐法布里-珀罗标准具作为滤波器串联工作。该滤波器可以通过改变标准具的电压、倾斜或温度来调谐到不同的波长。为了描述标准具的特性，一台利特罗摄谱仪与一台15厘米的卡尔·蔡司库德太阳望远镜一起被安装起来。校准标准具的太阳谱线FeI 6173 nm和CaII 8542 nm。在这项工作中，我们讨论的法布里-珀罗标准具的特性，特别是温度和电压调谐的系统的谱线提出的意见。我们提出的校准设置和各种调整参数的细节。我们还提出了使用系统参数获得的太阳图像。我们还介绍了使用该系统获得的太阳图像。
英文摘要：
Multi-application Solar Telescope is a 50 cm off-axis Gregorian telescope that has been installed at the lake site of Udaipur Solar Observatory. For quasi-simultaneous photospheric and chromospheric observations, a narrow-band imager has been developed as one of the back-end instruments for this telescope. Narrow-band imaging is achieved using two lithium niobate Fabry-Perot etalons working in tandem as a filter. This filter can be tuned to different wavelengths by changing either voltage, tilt or temperature of the etalons. To characterize the etalons, a Littrow spectrograph was set up, in conjunction with a 15 cm Carl Zeiss Coudé solar telescope. The etalons were calibrated for the solar spectral lines FeI 6173 Å, and CaII 8542 Å. In this work, we discuss the characterization of the Fabry-Perot etalons, specifically the temperature and voltage tuning of the system for the spectral lines proposed for observations. We present the details of the calibration set-up and various tuning parameters. We also present solar images obtained using the system parameters. We also present solar images obtained using the system.
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