Passive Arrays

Multiplex systems based on arrays are highly desirable in astronomy because of the cost of photons. However, large and dense heterodyne arrays are challenging to develop and most of the astronomical arrays in use are arrays of square law detectors, bolometers, photo detectors, etc. [1].

While 2-D focal plane arrays of suitable sensitivity and density have proven to be challenging, a 1-D bolometer array has been combined with a mechanical scanner to address this issue [4]. Particular attention should be called to the innovative mechanical scanner used in this system. Another important feature of this system is that it includes an integrated cryocooler and does not require cryogens. While this is still a substantial system, it shows a development path to a useable public application.