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Entry  Wed Mar 30 12:55:54 2011, Aidan, Laser, Hartmann sensor, Prism modulation experiment 
    Reply  Thu Mar 31 11:27:02 2011, Aidan, Laser, Hartmann sensor, Prism modulation experiment 
Message ID: 129     Entry time: Wed Mar 30 12:55:54 2011     Reply to this: 130
Author: Aidan 
Type: Laser 
Category: Hartmann sensor 
Subject: Prism modulation experiment 

I've set up a quick experiment to modulate the angle of the Hartmann sensor probe beam at 10mHz and to monitor the measured prism. The beam from the SLED is collimated by a lens and this is incident on a galvo mirror. The reflection travels around 19" and is incident on the HWS. When the galvo mirror is sent a 1.1Vpp sine wave, then beam moves around +/- 0.5" on the surface of the Hartmann sensor, giving around 50mrad per Vpp.

The galvo is currently being sent a 0.02Vpp sine wave at 10mHz.

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