Abstract: Electromagnetic bandgap isolation systems and methods are provided. In one example, an electromagnetic bandgap isolator device includes a base support having a curved surface. The electromagnetic bandgap isolator device further includes a metamaterial. The metamaterial includes a continuous curved layer in contact with the base support. The metamaterial is configured to absorb energy associated with a frequency range. Related systems and methods are also provided.

Abstract: Disclosed herein are systems and methods for a three-dimensional (3D) non-contact position sensor. A system includes a magnetic target coupled to and/or integrated with a target object and a position sensor comprising a plurality of magnetometers configured to provide a set of magnetic flux values corresponding to a magnetic field generated by the magnetic target. A logic device receives the set of magnetic flux values provided by the plurality of magnetometers of the position sensor and determines a position and/or orientation of the target object based, at least in part, on the received set of magnetic flux values. The position and/or orientation of the target object may be used as feedback to help position and/or orient the target object according to a desired position and/or orientation or to track its position accurately in real-time.

Abstract: Techniques are disclosed for systems and methods for nested gimbal assemblies. A gimbal system may include a base, a yoke, and a gimbal assembly rotatably connecting the yoke to the base. The gimbal assembly may include a motor, a bearing, and a ferrofluid seal. The motor may be configured to rotate the yoke relative to the base about a rotational axis. The bearing may be seated within the base and permit rotation of the yoke relative to the base about the rotational axis. The ferrofluid seal may be positioned to seal an interface between the yoke and the base. The motor may be positioned within an inner diameter of the bearing. The bearing may be positioned within an inner diameter of the ferrofluid seal.

Abstract: Techniques are disclosed for display systems and methods associated with pulse detection and imaging. In one example, a system includes an imaging device configured to capture an image that includes a light pulse of a pulse sequence. The system further includes a display device. The display device is configured to receive data associated with the pulse sequence, where the data includes a location of the light pulse. The display device is further configured to display the image and an overlay on the image. The overlay is indicative of the location of the light pulse. Related devices and methods are also provided.

Abstract: Open-loop or feed-forward image stabilization systems and related techniques are provided to improve the accuracy and reliability of imaging systems. An open-loop or feed-forward image stabilization system includes a fast steering mirror assembly, an angular motion sensor, and a logic device. The fast steering mirror assembly adjusts a propagation direction of an optical path for an imaging system. The angular motion sensor is configured to measure and provide an angular motion of the imaging system. The logic device is configured to provide open-loop or feed-forward control for the fast steering mirror assembly by determining a compensating angular offset for the fast steering mirror assembly based, at least in part, on the received angular motion of the imaging system, and by controlling the fast steering mirror assembly to adjust the propagation direction of the optical path for the imaging system according to the determined compensating angular offset.

Abstract: Radial counterbalance mechanisms and related techniques are provided to improve the accuracy and reliability of gimbal systems. A radial counterbalance system includes a radial counterbalance mechanism, an orientation sensor, and a logic device. The radial counterbalance mechanism includes a counterbalance weight and a motor configured to adjust a radial position of the counterbalance weight. The orientation sensor is configured to provide an orientation of a payload coupled to the gimbal ring, a platform coupled to the gimbal ring, and/or the gimbal ring. The logic device is configured to determine a compensating radial weight position for the counterbalance weight based, at least in part, on a received orientation, and to control the motor to position the counterbalance weight at the compensating radial weight position. The compensating radial weight position is configured to reduce a radial displacement of a center of gravity of the payload from the rotational axis of the gimbal ring.

Abstract: Techniques are disclosed for facilitating pulse detection and synchronized pulse imaging systems and methods. In one example, a system includes a light pulse detection device and an imaging device. The light pulse detection device is configured to detect a first light pulse. The light pulse detection device is further configured to determine that the first light pulse is associated with a pulse sequence. The light pulse detection device is further configured to determine timing information associated with a second light pulse of the pulse sequence. The light pulse detection device is further configured to generate data associated with the timing information. The imaging device is configured to determine an integration period based on the data. The imaging device is further configured to capture, using the integration period, an image that includes the second light pulse. Related devices and methods are also provided.

Abstract: A wavelength selective structure for selectively reflecting or absorbing incident electromagnetic visible or infrared radiation. The wavelength selective structure includes a wavelength selective structure with a plurality of layers, including a compound layer forming a plurality of surface elements, an electrically isolating intermediate layer, wherein the compound layer is in contact with a first surface of the electrically isolating intermediate layer, and a continuous electrically conductive layer in contact with a second surface of the electrically isolating intermediate layer. The compound layer includes at least one metallic layer and at least one dielectric layer. The selective surface has at least one resonance band for selectively reflecting or absorbing visible or infrared radiation based on a resonant electromagnetic coupling between the plurality of surface elements and the continuous electrically conductive layer.

Abstract: Techniques are disclosed for facilitating control of electric motors. A system includes a brushless direct current (BLDC) electric motor that includes a rotor and windings, where the rotor is configured to rotate with an adjustable angular speed. The system further includes a plurality of switching regulators. Each switching regulator is configured to generate an electrical drive signal based on to a torque control signal, where the angular speed of the rotor is based on the electrical drive signals. The system further includes a commutation logic circuit configured to selectively provide the electrical drive signals of the switching regulators to the windings based on a position of the rotor. To selectively provide the electrical drive signals, the commutation logic circuit may be configured to provide routing control signals provided as six-step commutation signals or motor phase control signals provided as sinusoidal commutation signals. Related systems, devices, and methods are also disclosed.

Abstract: A tunable electromagnetic radiation device that includes a wavelength selective structure comprising a plurality of layers. The plurality of layers includes a compound layer comprising a plurality of surface elements, an electrically isolating intermediate layer, and a continuous electrically conductive layer. The compound layer includes at least one metallic layer or metallic-like layer and at least one dielectric layer and is in contact with a first surface of the electrically isolating intermediate layer. The continuous electrically conductive layer is in contact with a second surface of the electrically isolating intermediate layer. The wavelength selective structure has at least one reflective or absorptive resonance band. The tunable electromagnetic radiation device further includes an electrode in electrical contact with at least one of the compound layer, the electrically isolating intermediate layer, and the continuous electrically conductive layer.

Abstract: A tunable electromagnetic radiation device that includes a wavelength selective structure comprising a plurality of layers. The plurality of layers includes a compound layer comprising a plurality of surface elements, an electrically isolating intermediate layer, and a continuous electrically conductive layer. The compound layer includes at least one metallic layer or metallic-like layer and at least one dielectric layer and is in contact with a first surface of the electrically isolating intermediate layer. The continuous electrically conductive layer is in contact with a second surface of the electrically isolating intermediate layer. The wavelength selective structure has at least one reflective or absorptive resonance band. The tunable electromagnetic radiation device further includes an electrode in electrical contact with at least one of the compound layer, the electrically isolating intermediate layer, and the continuous electrically conductive layer.

Abstract: A wavelength selective structure for selectively reflecting or absorbing incident electromagnetic visible or infrared radiation. The wavelength selective structure includes a wavelength selective structure with a plurality of layers, including a compound layer forming a plurality of surface elements, an electrically isolating intermediate layer, wherein the compound layer is in contact with a first surface of the electrically isolating intermediate layer, and a continuous electrically conductive layer in contact with a second surface of the electrically isolating intermediate layer. The compound layer includes at least one metallic layer and at least one dielectric layer. The selective surface has at least one resonance band for selectively reflecting or absorbing visible or infrared radiation based on a resonant electromagnetic coupling between the plurality of surface elements and the continuous electrically conductive layer.

Abstract: An apparatus and method improve sight. The apparatus includes a first sight configured to view a scene. A second sight is configured to alter content representative of the scene in a first manner to form first altered content. A third sight is configured to alter content representative of the scene in a second manner to form second altered content. An image combiner is configured to combine the second altered content with the first altered content to form combined altered scene content.