Abstract:
An apparatus includes a heat exchanger configured to be positioned around and coupled to a multi-axis gimbal. The heat exchanger includes an inlet configured to receive fluid containing heat generated by an equipment package carried by the gimbal. The heat exchanger also includes multiple heat rejection interfaces configured to reject the heat from the fluid into surrounding air in order to cool the fluid. The heat exchanger further includes an outlet configured to provide the cooled fluid from the heat exchanger. The heat rejection interfaces of the heat exchanger extend around the heat exchanger and are configured to reject the heat from the fluid regardless of a direction in which the gimbal is pointing the equipment package.
Abstract:
An apparatus includes a bootstrap accumulator having multiple fluid expansion volumes each configured to receive fluid. The bootstrap accumulator also includes a piston assembly configured to move within the fluid expansion volumes based on pressures within the fluid expansion volumes. The piston assembly includes (i) a fluid pathway that couples the fluid expansion volumes and (ii) a bypass valve configured to selectively open or block the fluid pathway. The piston assembly could also include multiple pistons and a connecting rod coupling the pistons. The fluid pathway could include a narrower path through a first portion of the connecting rod and a wider path through a second portion of the connecting rod. The bypass valve could include a ball and a spring configured to push the ball to block the narrower path through the first portion of the connecting rod.
Abstract:
A torque motor includes a large area rotor, a stator surrounding at least a portion of the rotor, and a small air gap separating the rotor from the stator to allow frictionless thermal coupling between the rotor and the stator. Heat from the rotor is transferred to the stator by conduction. The stator contacts an inner surface for a housing of the torque motor for conductively coupling to a cold environment air flow exterior to the torque motor housing. The air gap may have a dimension of about 0.002 to 0.003 inches. The stator may be conductively coupled to the torque motor housing by one of a thermal gap pad or high conductivity thermal gap filling compound. Heat conduction from the rotor to the stator preferably occurs without rotation of the rotor.
Abstract:
A vibration isolation device includes flexures and a multi-part mounting interface for coupling a frame that supports equipment to a structure. The flexures may include three pairs of flexures that allow movement in three orthogonal directions, to allow compliance and/or damp vibrations in the three directions. The flexures may surround the multi-part mounting interface, the parts of which are configured to move relative to one another. One of the parts of the mounting interfaces passes through another part of the mounting interface, such as in one or more holes in one of the interfaces. The device allows equipment mounted on the frame to be isolated from some or all of vibrations produced at the structure. In an example embodiment the vibration isolation system is used in mounting an optical sensor or device to an aircraft.
Abstract:
An optical system (e.g., a telescope) comprising an optical assembly that reflects and refracts light rays through a single window about an optical path to a detector. A field-of-view switch assembly comprises a mount, having a pair of diverter mirrors, movably coupled to the optical assembly and being selectively movable between a non-bypass position and a bypass position. The diverter mirrors bypass a first field-of-view and translate a second field-of-view (both through the single window) when moved from the non-bypass position to the bypass position to redirect the optical path. The diverter mirrors straddle the optical path in the non-bypass position. A dynamic shutter shields the second diverter mirror and exposes the second diverter mirror when moved between non-bypass and bypass positions. A four-bar linkage mechanism rotates the mount with an on-board motor and a torsional shaft to absorb impact forces. Associated methods are provided for facilitating switching between fields-of-view.
Abstract:
A torque motor includes a large area rotor, a stator surrounding at least a portion of the rotor, and a small air gap separating the rotor from the stator to allow frictionless thermal coupling between the rotor and the stator. Heat from the rotor is transferred to the stator by conduction. The stator contacts an inner surface for a housing of the torque motor for conductively coupling to a cold environment air flow exterior to the torque motor housing. The air gap may have a dimension of about 0.002 to 0.003 inches. The stator may be conductively coupled to the torque motor housing by one of a thermal gap pad or high conductivity thermal gap filling compound. Heat conduction from the rotor to the stator preferably occurs without rotation of the rotor.
Abstract:
A light sensor system including a reference light source that moves in unison with a primary mirror and/or an inertial measurement device, and/or the reference light source is directed toward an obscured region of the light sensor system. The reference light source may allow for improved jitter compensation based on feedback of the reference light. The feedback may be representative of the elastic deformation of the optics and telescope optical axis. The improved jitter compensation may allow for the light sensor system (e.g., the housing and/or mirrors) to be built with less stiff materials, which can reduce the cost of manufacturing the present light sensor system compared to previously known optical sensor systems. In cases of high vibration levels which would otherwise degrade the resulting image quality after material stiffness property selections have been exhausted, the light sensor system may provide jitter compensation to improve video or still image quality.
Abstract:
A device is provided for controlling fluid flow over a window of a movable optical instrument housing. The device includes a generally annular body having an inner peripheral edge configured to correspond to a peripheral edge of the window of the housing and an outer peripheral edge, an arcuate outer surface disposed between the inner peripheral edge and the outer peripheral edge, and a reduced width portion between the inner peripheral edge and the outer peripheral edge. The reduced width portion is configured to lower elevation torque. Other embodiments of the device and methods for controlling fluid flow are further disclosed.
Abstract:
A single monotlithic moving window may follow the free aperture of an optical sensor contained in a housing over a reasonable field of regard by translating the window with respect to the sensor and/or a pod cover. Because the window angle of attack is unvarying, near field turbulence is minimized over the envelope of operation.