Abstract: A target simulator device for the simulation of infrared targets as input to entrance optics. A voice coil of an audio loud speaker including a cone portion and two electrical input connections has a physical projection one end of which is coupled to the cone portion and the other end approximate to and in front of a shield aperture. A black body radiation source is placed behind the aperture and a frequency compensated amplifier electrically coupled to the input connections such that collimated signal-modulated black body energy that is proportional to the total range of frequencies input is observed by an infrared sensitive detector aligned with the radiation emanating from the aperture.

Abstract: An infrared (IR) illuminator indicator which has a fiber optics light guide hat channels the IR radiation from an IR radiation source in the illuminator to the faceplate of an image tube as an indicator mark. The image tube converts the IR radiation to the visible spectrum. If the operator of the image tube attempts to operate the IR illuminator at large ranges, or if a near target is suddenly removed so that the IR radiation suddenly reached a much larger range, the image tube gain will suddenly increase to compensate for less reflected radiation. With the fiber optics light guide channeling a constant amount of IR radiation from the IR radiation source to the input of the faceplate, the enhanced gain of the image tube automatically brightens the indicator mark to the observer of the image tube and thus indicates the need to immediately turn off the IR radiation source to avoid detection by the enemy.