Narcissus in current generation FLIR systems

Ford, Eric H.; Hasenauer, David M.

doi:10.1117/12.48446

Cited by 2 publications

(4 citation statements)

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“…4). However, changes in housing ghost reflections due to warming and cooling the housing, will require recalibration at times undesirable for some applications.…”

Section: Introductionmentioning

confidence: 93%

“…Paraxial calculation of YNI has been shown (Ref. [1][2][3][4][5] to indicate the strength ofnarcissus for scanning FLIRs. The calculation and interpretation is the same for scanning or staring FLIRs.…”

Section: Paraxial Narcissus Calculationsmentioning

confidence: 99%

“…[1][2][3][4][5][6]. Narcissus is the image nonuniformity due to the detector seeing its own cold reflection.…”

Section: Introductionmentioning

confidence: 99%

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<title>Narcissus considerations in optical designs for infrared staring arrays</title>

et al. 1996

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Narcissus is a stray light problem for infrared imaging sensors. Control ofnarcissus is a requirement for designing scanning sensors and narcissus analysis tools are available in some optical raytrace programs. These tools have not been optimized for staring sensors. Narcissus is assumed to be unimportant in staring array designs because the shading effects can be removed by offset correction of the detector array data. This would be sufficient for sensors which meet the following conditions: (1) calibrated at the enirance aperture, (2) operate at a constant optical housing temperature, (3) no movement of lenses for focus or change in field of view. Narcissus may be noticeable for sensors not meeting these conditions. We have developed procedures for applying existing narcissus analysis tools to staring sensors. A staring array prototype FLIR has been analyzed. Laboratory tests have confirmed the narcissus analysis.

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“…4). However, changes in housing ghost reflections due to warming and cooling the housing, will require recalibration at times undesirable for some applications.…”

Section: Introductionmentioning

confidence: 93%

Section: Paraxial Narcissus Calculationsmentioning

confidence: 99%

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<title>Narcissus considerations in optical designs for infrared staring arrays</title>

et al. 1996

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“…The irradiance on the scene image will be (5) H = A NA(TWA) from warmer scene areas, and H = A N(T) (6) from colder scene areas. Subscripts WA, CA denote scene warm area and cold area, respectively.…”

Section: Scene Radiance and Irradiance Differencesmentioning

confidence: 99%

Exact ray-tracing computation of narcissus-equivalent temperature difference in scanning thermal imagers

Rayces¹,

Lebich²

1992

SPIE Proceedings

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The formula for evaluation of narcissus equivalent temperature difference as a function of the scan angle in thermal imaging systems is made more meaningful by grouping the parameters in two factors: one depending on wavelength and temperature and the other, a function of the scan angle, depending on the geometry of the instrument. Exact ray tracing equations are used to evaluate the ratio of radiant energy reaching the detector from warm and cold areas of the instrument.

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Narcissus in current generation FLIR systems

Cited by 2 publications

References 0 publications

<title>Narcissus considerations in optical designs for infrared staring arrays</title>

<title>Narcissus considerations in optical designs for infrared staring arrays</title>

Exact ray-tracing computation of narcissus-equivalent temperature difference in scanning thermal imagers

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