Seeing monitor based on wavefront curvature sensing

Details Seeing monitor based on wavefront curvature sensing Seeing monitor based on wavefront curvature sensing

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236..474r&link_type=abstract

IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 1 (A91-23201 08-89

Physics

Optics

4

Focal Plane Devices, Monitors, Reflecting Telescopes, Scintillation, Wave Front Deformation, Adaptive Optics, Autocorrelation, Curvature, Data Processing, Photomultiplier Tubes, Turbulence

Scientific paper

A new wavefront sensing technique called curvature sensing is described. It maps the wavefront total curvature rather than its slope and has been applied to an experimental seeing monitor which detects turbulence induced fast focus fluctuations. Some of the advantages this monitor presents, as compared to DIMM's, are: (1) sensitivity is increased by the use of a circular pupil, (2) the cost is lowered by the use of a photomultiplier, (3) the loss of signal is prevented by the system's fast run, (4) the system runs continuously, and (5) the noise bias is continuously measured and subtracted out.

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