Abstract: Techniques are disclosed for optical imager devices, systems, and methods. In one example, an imaging system includes a focal plane array (FPA) and a light shield. The FPA includes a detector array configured to detect a first portion of electromagnetic radiation and generate a detector signal based on the first portion. The FPA further includes a readout circuit coupled to the detector array and configured to receive the detector signal. The light shield is coupled to the FPA and configured to block a second portion of the electromagnetic radiation. Related devices and methods are also provided.

Abstract: A state-of-charge indicator, powered by a battery to be monitored, compares a reference voltage level developed from the battery and a voltage proportional to that of the battery in a differential-type circuit employing a pair of transistors with common emitter load and each having a collector current activated annunciator; with a first annunciator being activated under conditions of battery voltage definitive of a "good" battery, both annunciators being activated for lower battery voltage indicative of a failing trend, only the second annunciator being activated for still lower battery voltage indicative of a "bad" battery, and neither annunciator being activated for still lower battery voltage indicative of a failed condition.