The High Resolution Chirp Transform Spectrometer for the Sofia-Great Instrument
The High Resolution Chirp Transform Spectrometer for the Sofia-Great Instrument
复制标题
适用于 Sofia-Great 仪器的高分辨率线性调频变换光谱仪
DOI：
10.1007/s10686-005-9004-3
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发表时间：
2004
影响因子：
3
通讯作者：
P. Hartogh
中科院分区：
文献类型：
--
作者：
G. Villanueva;P. Hartogh
在本文中，我们设计了一个高分辨率的啁啾变换光谱仪（CTS），它是SOFIA（平流层红外天文观测台）上的GREAT（德国太赫兹天文接收机）仪器的一部分。新的光谱仪将提供独特的光谱分辨能力和线性响应，因为CTS光谱仪执行的模拟傅里叶变换通过一种新的设计得到改进，我们称之为“自适应数字啁啾处理器（ADCP）”。ADCP的原理是通过数字方式产生适应压缩频散特性的色散信号，从而实现最大的频谱分辨率和更高的动态范围。实验结果表明，该方法的白噪声动态范围为30 dB，光谱分辨率（FWHM）为41.68 kHz，这意味着在GREAT仪器（4.7 THz）的高频接收器上分析信号时，光谱分辨率（λ/Δ λ）高于108。
In this paper, we present the design of a high resolution Chirp Transform Spectrometer (CTS) which is part of the GREAT (German REceiver for Astronomy at Terahertz frequencies) instrument onboard SOFIA, the Stratospheric Observatory For Infrared Astronomy. The new spectrometer will provide unique spectral resolving power and linearity response, since the analog Fourier transform performed by the CTS spectrometer was improved through a new design, that we call “Adaptive Digital Chirp Processor (ADCP)”. The principle behind the ADCP consists on digitally generating the dispersive signal which adapts to the compressor dispersive properties, achieving maximum spectral resolution and higher dynamic range. Excellent test results have been obtained such as a white noise dynamic range of 30 dB, and a spectral resolution (FWHM) of 41.68 kHz which would mean if analyzing signals with the high frequency band receiver on the GREAT instrument (4.7 THz) a spectral resolving power (λ/Δ λ) higher than 108.