A feasibility study of the REFL33Q as a MICH sensor was coarsely performed from the point view of the noise performance.
The answer is that :
the REFL33Q can be BARELY used as a MICH sensor in the PRMI configuration, but the noise level will be at only sub-nano meter level.
Tonight I will try to use the REFL33Q to control the MICH DOF to see what happens.
I did a coarse noise analysis for the REFL33Q signal as shown in the attached plot below while making some assumptions as follows.