Основной обзорный инструмент

Телескоп был построен по схеме «ломаного» хода лучей: излучение падало на 57-сантиметровое главное зеркало, затем малое вторичное зеркало направляло его через центральное отверстие главного зеркала в фокальную плоскость. Три прибора, на которые оно фокусировалось, включали чувствительные к ИК-излучению полупро

водниковые приемники. Телескоп размещался внутри изолированного резервуара, заполненного перед запуском 457 л жидкого гелия. Хладагент поддерживал трубу телескопа и зеркала при температуре около 10 К. Приемники охлаждались до температуры приблизительно 2 К. Хладагент поддерживался при этой температуре (ниже точки кипения) за счет его медленного испарения.

В качестве приемников использовались фотопроводящие детекторы со специально подобранными фильтрами; они были чувствительны к определенным полосам инфракрасного спектра. Их чувствительность была настолько высокой, что телескоп мог «заметить» пылинку на расстоянии 2

или 3 км. Основной обзорный инструмент представляет собой набор из 62 детекторов, почти полностью перекрывающих ИК-спектр от 8 до 120 мкм четырьмя полосами с центрами при 12, 25, 60 и 100 мкм. (Видимая часть спектра занимает область до 0,7 мкм, а радиодиапазон начинается примерно с 1000 мкм.) В фокальной плоскости были смонтированы еще два прибора: спектрометр для записи ИК-спектра ярких источников и фотометр с более высоким пространственным разрешением (чем могли обеспечить обзорные детекторы) для измерения отобранных источников.

Каждый элемент набора обзорных детекторов сканировал полоску неба шириной пять угловых минут и вырабатывал сигнал, пропорциональный полному потоку падающего на него излучения. При машинной обработке на Земле из непрерывного потока данных выделялись дискретные источники и многократные регистрации каждого источника объединялись для совместной обработки. Дискретные источники в этой процедуре считались «точечными» (размером меньше нескольких угловых минут).



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