Active disturbance rejection control of temperature for ultrastable optical cavities.
This paper describes the application of a novel active disturbance rejection control (ADRC) to the stabilization of the temperature of two ultra-stable Fabry-Perot cavities. The cavities are 10 cm long and entirely made of ultralow- expansion glass. The control is based on a linear extended state observer that estimates and compensates the disturbance in the system in real time. The resulting control is inherently robust and easy to tune. A digital implementation of ADRC gives a temperature instability of 200 μK at one day of integration time.
Istituto Nazionale di Ricerca Metrologica, Torino, Italy. m.pizzocaro@inrim.it
Marco
M
Pizzocaro
Davide
D
Calonico
Claudio
C
Calosso
Cecilia
C
Clivati
Giovanni A
GA
Costanzo
Filippo
F
Levi
Alberto
A
Mura