Tianlai experiment
The Tianlai experiment (Chinese: 天籁) is a radio astronomy experiment run by the National Astronomical Observatories, Chinese Academy of Sciences (NAOC). Its aim is to develop the key techniques of intensity mapping observation for the redshifted 21cm line of neutral hydrogen, in order to probe the large-scale structure, and to detect and measure the dark energy using baryon acoustic oscillations (BAO). The experiment is currently at a pathfinder stage, two pathfinder interferometric imaging radio telescope arrays have been built for this experiment. These are the cylinder array and the dish array. In the full scale stage, the experiment is expected to measure the large scale structure, and use the BAO feature to detect the dark energy