The first, and still most widely used, astronomical telescope/detector system is the human eye. With a relatively small aperture, and able to detect light only in the visible part of the spectrum (400-700 nm), the human eye has serious limitations. In this chapter so far we have described the techniques and telescopes that have enhanced our ability to see the universe. We now turn to the latest revolutionary detectors and other technologies that have improved that view. These include imaging devices such as charge-coupled devices, or CCDs, now commonly found in digital cameras, new radio-frequency detectors such as bolometers, bolometer arrays, and hot electron bolometer mixers, and techniques now enabled by such technological advances as mul-tiobject spectroscopy.
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