A system comprising: a lens through which mid-wave infrared radiation (MWIR), long-wave infrared radiation (LWIR), and visible/near infrared radiation (VIS/NIR) pass; a beam splitter to split the MWIR, the LWIR, and the VIS/NIR into one or more of an MWIR component, an LWIR component, and a VIS/NIR component; an MWIR detector for receiving the MWIR component, wherein the MWIR detector comprises a bolometer array and a filter-window operable to permit only the MWIR component to reach the bolometer array; an LWIR detector for receiving the LWIR component and a visible/near infrared (VIS/NIR) detector for receiving the VIS/NIR component, wherein the LWIR detector does not include a filter or other device for attenuating the LWIR component, wherein the LWIR detector and the VIS/NIR detector are standalone units (140, 240) separate from the MWIR detector; and a computer processor coupled to the MWIR detector, the LWIR detector, and the VIS/NIR detector; wherein the MWIR detector is operable to detect the MWIR component; wherein the LWIR detector is operable to detect the LWIR component; wherein the VIS/NIR detector is operable to detect the VIS/NIR component; wherein the computer processor is operable to analyze the MWIR component and to determine a presence of a flame; wherein the computer processor is operable to analyze one or more of the LWIR component and the VIS/NIR component and to determine whether the system is functioning properly; and wherein one or more of the LWIR detector and the VIS/NIR detector determine if the system is functioning properly by determining that the lens is operable, that the LWIR detector or the VIS/NIR detector is operable, that there is an obstruction in a field of view of the LWIR detector or the VIS/NIR detector, or that there is a presence of a hot object in the field of view of the LWIR detector or the VIS/NIR detector that is interpreted as a flame; and comprising an MWIR emitting element for determining the functionality of the MWIR detector. a lens through which mid-wave infrared radiation (MWIR), long-wave infrared radiation (LWIR), and visible/near infrared radiation (VIS/NIR) pass; a beam splitter to split the MWIR, the LWIR, and the VIS/NIR into one or more of an MWIR component, an LWIR component, and a VIS/NIR component; an MWIR detector for receiving the MWIR component, wherein the MWIR detector comprises a bolometer array and a filter-window operable to permit only the MWIR component to reach the bolometer array; an LWIR detector for receiving the LWIR component and a visible/near infrared (VIS/NIR) detector for receiving the VIS/NIR component, wherein the LWIR detector does not include a filter or other device for attenuating the LWIR component, wherein the LWIR detector and the VIS/NIR detector are standalone units (140, 240) separate from the MWIR detector; and a computer processor coupled to the MWIR detector, the LWIR detector, and the VIS/NIR detector; wherein the MWIR detector is operable to detect the MWIR component; wherein the LWIR detector is operable to detect the LWIR component; wherein the VIS/NIR detector is operable to detect the VIS/NIR component; wherein the computer processor is operable to analyze the MWIR component and to determine a presence of a flame; wherein the computer processor is operable to analyze one or more of the LWIR component and the VIS/NIR component and to determine whether the system is functioning properly; and wherein one or more of the LWIR detector and the VIS/NIR detector determine if the system is functioning properly by determining that the lens is operable, that the LWIR detector or the VIS/NIR detector is operable, that there is an obstruction in a field of view of the LWIR detector or the VIS/NIR detector, or that there is a presence of a hot object in the field of view of the LWIR detector or the VIS/NIR detector that is interpreted as a flame; and comprising an MWIR emitting element for determining the functionality of the MWIR detector.