Grey level on axis computer holograms for incoherent image processing

Braunecker, Bernhard; Hauck, R.

doi:10.1016/0030-4018(77)90340-6

Cited by 18 publications

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, it is possible to arrive at the required OTF by means of hybrid aperture synthesis. 1,7,12 Since great emphasis will be placed on cost savings and design simplicity, the hybrid techniques will be ruled out in the meantime. Instead, the prespecified low pass filter will be installed on frequency offset sections of the aperture OTF, in effect becoming a bandpass filter.…”

Section: Introductionmentioning

confidence: 99%

Optical bandpass filters for detector arrays’ modulation transfer function estimation by means of laser speckle

Astar

1996

Opt. Eng

View full text Add to dashboard Cite

Two apertures, a square slit (SS) and a diamond slit (DS), both zero'th-order magnitude transparencies with bandpass filters in their optical transfer functions (OTFs), are designed and optimized for the purpose of modulation transfer function (MTF) evaluation of detector arrays by means of laser speckle. The SS and DS apertures are compared to an existing design, the extended frequency aperture (EFA), and show, respectively, improvements of 464% and 58% in filter magnitude; improvements of Ϫ13.4% (a compromise) and 17% in bandwidth; and improvements of 627% and 423% in throughput, implying a greatly reduced laser power requirement. As a result, they should significantly enhance detector arrays' MTF evaluations and at a greatly reduced cost. The DS aperture possesses identical OTFs in both the horizontal and vertical directions, enabling MTF evaluation using the bandpass filters in those directions from the same speckle data frame-previously not possible. The DS aperture can be further modified to yield filter magnitude and bandwidth improvements of 111% and 40%, respectively; although becoming easier to fabricate, this modification would be at a lower throughput improvement of 310% over the existing design. © 1996 Society of Photo-Optical Instrumentation Engineers.

show abstract

Section: Introductionmentioning

confidence: 99%