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Entry  Thu Aug 11 12:31:39 2011, Nicole, Summary, SUS, Photosensor Head Calibration Curve for TT Frame ps2frame.jpg
    Reply  Thu Aug 11 14:22:00 2011, Nicole, Summary, SUS, Photosensor Head Calibration Curve for TT Frame 
    Reply  Thu Aug 11 14:32:12 2011, Koji, Summary, SUS, Photosensor Head Calibration Curve for TT Frame 
Message ID: 5188     Entry time: Thu Aug 11 12:31:39 2011     Reply to this: 5191   5192
Author: Nicole 
Type: Summary 
Category: SUS 
Subject: Photosensor Head Calibration Curve for TT Frame 

I have re-calibrated the photosensor I used to measure the displacements of the TT frame (what I call "Photosensor 2").

As before, the linear region is about 15.2mm to 25.4mm. It is characterized by the slope -0.0996 V/mm (-0.1 V/mm). Recall that photosensor 1 (used to measure mirror displacements) has a calibration slope of -3.2V/mm. The ratio of the two slopes (3.2/0.1 = 32). We should thus expect the DC coupling level to be 32? This is not what we have for the DC coupling levels in our data (2.5 for flexibly-supported, fully-assembled TT (with EDC, with bar), 4.2 for EDC without bar, 3.2 for rigid EDC without bar, 3.2 for no EDC, with bar, 3.2 for no EDC without bar) . I think I may need to do my calibration plot for the photosensor at the frame?

ps2frame.jpg

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