The transmission of the atmosphere in the infrared—A review

Howard, John N.; Garing, J. S.

doi:10.1016/0020-0891(62)90048-9

Cited by 16 publications

(2 citation statements)

References 28 publications

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“…The reduction in IR intensity when the sensor moves from 0.3 km to 12 km is higher in the MWIR band compared to the LWIR band. It is because the absorption of IR radiation in the MWIR band is higher compared to the LWIR band (Howard and Garing, 1962).…”

Section: Exhaust Plume Simulationmentioning

confidence: 99%

Analysis of aero engine plume potential core infrared signature

Bhatt,

Mahulikar

2024

AEAT

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Purpose Aero-engine exhaust plume length can be more than the aircraft length, making it easier to detect and track by infrared seeker. Aim of this study is to analyze the effect of free stream Mach number (M∞) on length of potential core of plume. Also, change in infrared (IR) signature of plume and aircraft surface with variation in elevation angle (θ) is examined. Design/methodology/approach Convergent divergent (CD) nozzle is located outside the rear fuselage of the aircraft. A two dimensional axisymmetric computational fluid dynamics (CFD) study was carried out to study effect of M∞ on potential core. The CFD data with aircraft and plume was then used for IR signature analysis. The sensor position is changed with respect to aircraft from directly bottom towards frontal section of aircraft. The IR signature is studied in mid wave IR (MWIR) and long wave IR (LWIR) band. Findings The potential plume core length and width increases as M∞ increases. At higher altitudes, the potential core length increases for a fixed M∞. The plume emits radiation in the MWIR band, whereas the aerodynamically heated aircraft surface emits IR in the LWIR band. The IR signature in the MWIR band continuously decreases as the sensor position changes from directly bottom towards frontal. In the LWIR band the IR signature initially decreases as the sensor moves from the directly bottom to the frontal, as the sensor begins to see the wing leading edges and nose cone, the IR signature in the LWIR band slightly increases. Originality/value The novelty of this study comes from the data reported on the effect of free stream Mach number on the potential plume core and variation of the overall IR signature of aircraft with change in elevation angle from directly below towards frontal section of aircraft.

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Section: Exhaust Plume Simulationmentioning

confidence: 99%

Analysis of aero engine plume potential core infrared signature

Bhatt,

Mahulikar

2024

AEAT

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“…The intensity of the fundamental band of NO vapor was remeasured and found to be higher than previously published values (491), while the temperature dependence of infrared band intensities was used to determine the heat of dissociation of N204 (234). noted-for example, five by Burch and coworkers (97); this subject was also reviewed (274).…”

Section: Intensitiesmentioning

confidence: 99%