25-08-2017, 09:32 PM
Abstracts: “Enhancing The Resolution of Temperature Controller Unit of PARAS” for the project PARAS (PRL Advance Radial velocity All sky Search) to achieve a temperature stability of 0.01°C rms throughout the period of observation of thermally insulated chamber where PARAS spectrograph is installed. The scientific aspect of the temperature controlled environment is to bring down the error in radial velocity measurement to 1m/s. Radial velocity (RV) technique is used to determine various orbital parameters in exo-planet search. It has been found that temperature variation of 1°C at the spectrograph environment can increase the error in radial velocity measurement by few thousands of m/s. Due to temperature and pressure variations, mechanical flexures(in the scale of micrometers) in the optical components can increase the error by a significant percentage. The cost of the project is extremely modest as against the cost of a commercially available temperature controller of similar kind.