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李遠哲陣列望遠鏡計畫(YTLA, 原簡稱AMiBA)

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This custom plate assembly was design to generate and distribute 2 to 18 GHz wide-band noise or CW tone for in-situ calibration and test of the I/Q down converters and digital backend correlator system. The plate is mounted on the platform and is controlled remotely via Ethernet.

Noise/Tone Calibration Plate, YTLA Project

This photo represents the first production in-phase/quadrature down converter designed for the YTLA project as an upgrade to the AMiBA analog correlator system. The design was based on the results of a prototype development conducted the previous year.

In-Phase/Quadrature Down Converter Production Bracket, YTLA Project

This is a photo of the YTLA clock distribution drawer packaged in a standard rack mount 2U height EMI chassis.

Clock Distribution Chassis, YTLA Project

Early prototype of in-phase/quadrature down converter for YTLA upgrade. The goal was to down convert and digitize any 2 GHz portion of the 2-18 GHz IF spectra from the receiver output using our new in-house board development of a 5 Gsps ADC board (courtesy of H.M. Jiang).

In-Phase/Quadrature Down Converter Prototype Plate, YTLA Project

Photo of wide-band radio frequency translator plate. This prototype provides signal conditioning and frequency translation of a pair of intermediate frequency channels to baseband for digitization.

Early Prototype Down Converter Plate, YTLA Project

Photos of analog correlator module. Left - top view of module with custom low noise DC amplifier board. Right - bottom view of custom 4-lag wide-band analog correlator module consisting of two 4-way Wilkinson power dividers and four double balanced mixers.

Wideband Analog Correlator Module, AMiBA Project

2006年10月李遠哲陣列望遠鏡計畫（YTLA原簡稱AMiBA）在夏威夷的毛納洛峰正式啟用，是亞洲首座且僅有的一座專門研究宇宙學的儀器。此一尖端儀器的設計、興建與運轉均由本所主導，主要的合作者為國立臺灣大學物理系及電機系。位於海拔3,400公尺處的宇宙背景輻射陣列能靈敏地觀測到伴隨宇宙最初膨脹之宇宙微波背景（CMB）輻射的分佈。由CMB的分佈可嚴格界定宇宙的組成成分，如一般物質、暗物質、與暗能量（一種假設的能量形式，一般認為它是造成宇宙加速的原因）等的相對比例。宇宙背景輻射陣列也能藉由CMB光子的逆康普吞散射，偵測並描繪遙遠的星系團。星系團具有在波長3毫米之輻射稍微被冷卻的特徵，且與星系的距離無關。此特徵成為探測原本無法觀測的遙遠宇宙之結構的有力工具。此陣列於2007年開始運轉，藉由CMB冷卻的特徵，已完成8個遙遠星系團的初步觀測。2009年我們完成李遠哲陣列望遠鏡（YTLA原簡稱AMiBA）從7座0.6米鏡面升級為13座1.2米鏡面的擴建工程，使得我們的觀測速度改善了約60倍。