The noise bias problem in optical speckle imaging experience with a real detector

Details The noise bias problem in optical speckle imaging experience with a real detector The noise bias problem in optical speckle imaging experience with a real detector

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..627..772h&link_type=abstract

IN: Instrumentation in astronomy VI; Proceedings of the Meeting, Tucson, AZ, Mar. 4-8, 1986. Part 2 (A87-36376 15-35). Bellingha

Astronomy and Astrophysics

Astronomy

3

Calibrating, Counting Circuits, Reflecting Telescopes, Signal To Noise Ratios, Speckle Interferometry, Faint Objects, Fourier Transformation, Photons, Power Spectra, Transfer Functions

Scientific paper

Diffraction-limited images for bright objects have been obtained using various large astronomical telescopes, including the MMT, but the results have not been convincing for fainter objects. All speckle interferometric techniques utilizing image power spectrum or autocorrelation methods to obtain calibrated image amplitudes are subjected to a noise bias, independent of image frequency for ideal detectors with delta-functionlike point-spread functions, which must be removed to obtain calibrated image amplitudes. The noise bias characteristic of the present intensified TV detector, both as a raster event localizer (faint object mode) and as a convenctional image amplitude detector (bright object mode), is not only image frequency-dependent but signal rate- and signal distribution-dependent, as well. This precludes signal independent calibration of the characteristic bias functions and sets limits on object faintness for successful image recovery. Implications for detector development are noted.

Affiliated with

Also associated with

No associations

Rating

The noise bias problem in optical speckle imaging experience with a real detector does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The noise bias problem in optical speckle imaging experience with a real detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The noise bias problem in optical speckle imaging experience with a real detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1848367