PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
A dither mirror has been developed which uses three piezo-electric translators for mirror positioning. Three voltages, generated by a strain gauge in each translator and proportional to translator position, are used as position feedback in the closed-loop controller. The nominal mirror scan pattern, a 33 Hz square, is produced by commanding azimuth and elevation angles. This paper describes the three-channel electronic controller under development. Each channel is a closed-loop controller for one actuator/strain gauge pair. Controller circuitry is described and the results of bandwidth optimization are presented. Controller performance is further enhanced through the application of a Digital Error Correction System (DECS). DECS is a second control loop which measures the controller response and alters the command signal to achieve the desired response. Controller performance is presented and compared with the significant improvement achieved using DECS.
John B. Thatcher Jr.,Robert R. Clappier, andRay Von Savoye
"Primary mirror controller with digital error correction", Proc. SPIE 2227, Cryogenic Optical Systems and Instruments VI, (23 June 1994); https://doi.org/10.1117/12.178612
ACCESS THE FULL ARTICLE
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
The alert did not successfully save. Please try again later.
John B. Thatcher Jr., Robert R. Clappier, Ray Von Savoye, "Primary mirror controller with digital error correction," Proc. SPIE 2227, Cryogenic Optical Systems and Instruments VI, (23 June 1994); https://doi.org/10.1117/12.178612