for example what measures are u referring to?
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Conventional countermeasures to an IR missile threat include jamming systems which confuse or blind the IR missile using either IR lamps and/or IR lasers. These jamming systems transmit either a high powered IR carrier signal to blind the IR detector of the incoming IR missile or, otherwise, transmit a lower powered IR carrier signal modulated with a modulating signal to confuse the IR detector of the incoming missile.
In Closed-Loop InfraRed CounterMeasure (CLIRCM) systems, the optical subsystem of the missile sensor is remotely interrogated to determine its optical modulation frequency. Coherent laser energy that is specifically encoded in a suitable format by the countermeasure system is then directed toward the missile sensors, thereby confusing, or jamming, the missile sensors, causing the missile to be steered off course. High-power laser energy can also be used to counterattack FPA-based systems, by disabling the focal plane array.
The IR lamp and/or IR laser jamming systems are heavy, complex, consume a great deal of power, and require significant space. Real estate in airborne platforms, as well as in most other transportation is typically at a premium or may not be available. Further, systems using IR lasers include precise pointing and tracking devices, which are hard to implement and produce drag on an aircraft platform.
Owing to their extremely high cost, such countermeasure systems have enjoyed only limited use, primarily on military aircraft. The countermeasure systems are commonly integrated into the aircraft, for example, in the fuselage, wing, or nose of the aircraft, or fixed onto an outer portion of the aircraft. Depending on where the countermeasure systems are mounted to the aircraft, they can lead to an increase in drag, reducing flight performance and increasing operating costs. Also, servicing, maintenance, upgrading and testing of the systems are expensive and time consuming procedures. In addition, such procedures require grounding of each aircraft for a period of time.
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Full Article is here:
Infrared Countermeasures Systems