Controlling the Secondary Mirror Cell of the Euro50 Project using an Inertial Measurement Unit
(2005) In MSc ThesesDepartment of Automatic Control
- Abstract
- When building a telescope, importance does not only lie on the optical performance. Keeping the entire structure stable is also of great importance. In the case of the Euro50, the secondary mirror cell will be located some 60 m above ground level, exposed of wind speeds up to 15 m/s. This makes the stabilization of the mirror cell to a dicult problem. However, it has to be solved. <p> The main goal of this master thesis is to develop a controller to stabilize the secondary mirror cell of the Euro50 extremely large telescope. The approach is to use an inertial measurement unit, consisting of gyros and accelermeters, for position feedback. This approach has been evaluated before, with the conclusion that no long sample times can be made due... (More)
- When building a telescope, importance does not only lie on the optical performance. Keeping the entire structure stable is also of great importance. In the case of the Euro50, the secondary mirror cell will be located some 60 m above ground level, exposed of wind speeds up to 15 m/s. This makes the stabilization of the mirror cell to a dicult problem. However, it has to be solved. <p> The main goal of this master thesis is to develop a controller to stabilize the secondary mirror cell of the Euro50 extremely large telescope. The approach is to use an inertial measurement unit, consisting of gyros and accelermeters, for position feedback. This approach has been evaluated before, with the conclusion that no long sample times can be made due to noise in the feedback. Here, a wavefront sensor is used to create additional position feedback, thus allowing the long sample times required. Favourably, more than one controller should be derived, to give the Euro50 developers more freedom of choise. Also, the noise charateristics of the inertial measurement unit are to be investigated, to give recommendations of the performance needed. <p> This master thesis is one of three closely related projects involving the secondary mirror cell of the Euro50 telescope. The others are Modeling and Control of a Large Deformable Mirror, and Actuator servos for Deformable Mirrors. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/8847938
- author
- Sandberg, Olof
- supervisor
- organization
- year
- 2005
- type
- H3 - Professional qualifications (4 Years - )
- subject
- publication/series
- MSc Theses
- report number
- TFRT-5750
- ISSN
- 0280-5316
- language
- English
- id
- 8847938
- date added to LUP
- 2016-03-18 09:56:27
- date last changed
- 2016-03-18 09:56:27
@misc{8847938, abstract = {{When building a telescope, importance does not only lie on the optical performance. Keeping the entire structure stable is also of great importance. In the case of the Euro50, the secondary mirror cell will be located some 60 m above ground level, exposed of wind speeds up to 15 m/s. This makes the stabilization of the mirror cell to a dicult problem. However, it has to be solved. <p> The main goal of this master thesis is to develop a controller to stabilize the secondary mirror cell of the Euro50 extremely large telescope. The approach is to use an inertial measurement unit, consisting of gyros and accelermeters, for position feedback. This approach has been evaluated before, with the conclusion that no long sample times can be made due to noise in the feedback. Here, a wavefront sensor is used to create additional position feedback, thus allowing the long sample times required. Favourably, more than one controller should be derived, to give the Euro50 developers more freedom of choise. Also, the noise charateristics of the inertial measurement unit are to be investigated, to give recommendations of the performance needed. <p> This master thesis is one of three closely related projects involving the secondary mirror cell of the Euro50 telescope. The others are Modeling and Control of a Large Deformable Mirror, and Actuator servos for Deformable Mirrors.}}, author = {{Sandberg, Olof}}, issn = {{0280-5316}}, language = {{eng}}, note = {{Student Paper}}, series = {{MSc Theses}}, title = {{Controlling the Secondary Mirror Cell of the Euro50 Project using an Inertial Measurement Unit}}, year = {{2005}}, }