Perspective of long baseline interferometry

摘要: This article is a sort of sequel the earlier extensive review by Saha (1999a) where emphasis was laid down on ground based single aperture, as well working long baseline optical interferometers (LBI) situated at various observatories across globe that are producing large amount astronomical results. Since future high resolution astronomy lies with new generation arrays, numerous technical challenges developing such systems addressed indicating current trends and path to progress in interferometry. The Palomar testbed interferometer (PTI), Navy prototype (NPOI), Keck interferometer, Very telescope (VLTI), Center for angular (CHARA) array, Optical very array (OVLA), Mitaka infrared arrays (MIRA), etc., being developed. A few them, viz., PTI, NPOI, IOTA Among have been described (1999a), expansion Grand interf\'erom\`etre \`a deux (two) t\'elescopes (GI2T), Infrared (IOTA) progress. status all these stated above enumerated. data analysis carried out using also described. space interferometry programmes advancing fast. notable ones Space technology 3 (ST3), mission (SIM), Darwin; they already received funds. details their objectives highlighted.