TCS (TCS)swinkels - 19:55 Friday 20 November 2009 (25684)
Print this reportEtalon servosI implemented some servos in Alp_TCS that should keep both input mirrors at the right position of the etalon fringe by acting on the TCS powers. This should finally replace the old method, for which there was always a human in the loop. Since the temperature of the mirrors is now availabe in the data, it was easy to implement a classical servo. The gain of the loop is set for a time constant of 10 hours, so it should take a bit more than a day for the servo to converge. The temperature setpoints are 3 degrees for the NI (minimum of fringe) and 3.1 for the WI (top of fringe). Attached figure shows that the servos at least started moving in the right direction, but we will have to see after the weekend if they are really working as expected.
