Radiometric Characterization Methods For Infrared Countermeasures Systems

John L. Grangaard; Charles Link; Gerald Spade; William Ramsey

doi:10.1117/12.971072

8 February 1985 Radiometric Characterization Methods For Infrared Countermeasures Systems

John L. Grangaard, Charles Link, Gerald Spade, William Ramsey

Proceedings Volume 0499, Optical Radiation Measurements; (1985) https://doi.org/10.1117/12.971072
Event: 28th Annual Technical Symposium, 1984, San Diego, United States

Abstract

Infrared countermeasures systems used to protect aircraft must produce a powerful infrared radiation pattern spread over a wide range of angles, and with a complicated modulation in time. The measurement of this radiation with respect to the parameters of time, angle, and wavelength is described. The radiometer measurement equation is examined to see what approximations are necessary for a solution in the terms desired. The measurement apparatus is described along with how it satisfies the measurement equation approximations. A two-step procedure was required for measurement of the spectral radiant intensity. First, the relative spectral output was determined using a monochromator, and then a scaling factor is determined for converting this to absolute units. An electrically activated shutter was used for the radiometer reference rather than the usual chopper. The detector was used in the DC coupled mode and a digital oscilloscope was used under computer control to acquire data. The results obtained were intended mainly for setting parameters for simulation studies of the effectiveness of these countermeasures systems. The manu-facturers of these systems also have measurement facilities in their own plants. A comparison is made between these different techniques, discussing the different approximations required and the advantages or disadvantages of these different methods.

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John L. Grangaard, Charles Link, Gerald Spade, and William Ramsey "Radiometric Characterization Methods For Infrared Countermeasures Systems", Proc. SPIE 0499, Optical Radiation Measurements, (8 February 1985); https://doi.org/10.1117/12.971072

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KEYWORDS

Radiometry

Transmitters

Black bodies

Infrared countermeasures

Monochromators

Mirrors

Sensors

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