Abstract:
One exemplary embodiment is directed to a vibratory structure gyroscope having a substrate having a top surface. The vibratory structure gyroscope can also include a resonator having a hemitoroidal shape, the resonator including a stem and an outer lip that surrounds the stem, the stem attached to the top surface of the substrate and the outer lip located apart from the top surface to allow the resonator to vibrate.
Abstract:
Photonic structures and photonic devices are provided. A photonic structure includes a three-dimensional photonic crystal and an actuator. The three-dimensional photonic crystal comprises an elastomeric, auxetic material and configured to provide a predetermined optical bandgap. The actuator is coupled to the three-dimensional photonic crystal and is configured to compress the three-dimensional photonic crystal. When the actuator compresses the three-dimensional photonic crystal, the three-dimensional photonic crystal shifts from reflecting light in a first wavelength range to light in a second wavelength range.
Abstract:
A method of fabricating a multi-axis sensor is provided. The method includes forming patterns of sacrificial material overlaying a substrate and overlaying a flexible material on the sacrificial material and an anchor-surface of the substrate. The flexible material includes sensor-regions, an anchor-region, and at least one hinge-region. The method further includes forming sensor elements from orientable sensor material overlaying respective sensor-regions of the flexible material; forming at least one respective anchor-hinge in the flexible material along the boundary between the anchor-region and an adjacent sensor region; forming the sensor-regions, the anchor-region, and the at least one hinge-region in the flexible material; training the sensor elements to form respective oriented-sensor elements that are oriented in the same direction; etching the sacrificial material; and etching the substrate at an angle from the anchor-surface.
Abstract:
A ground contact switch system comprises a first object configured to contact a ground surface during a stride, and one or more switches coupled to the first object. An inertial measurement unit can be coupled to the first object. The one or more switches are configured to detect when the first object is at a stationary portion of the stride. The one or more switches can also be configured to send a signal to activate an error correction scheme for the inertial measurement unit.
Abstract:
An eye tracking system includes a transparent lens, at least one light source, and a plurality of light detectors. The transparent lens is adapted for disposal adjacent an eye. The at least one light source is disposed within the transparent lens and is configured to emit light toward the eye. The at least one light source is transparent to visible light. The plurality of light detectors is disposed within the transparent lens and is configured to receive light that is emitted from the at least one light source and is reflected off of the eye. Each of the light detectors is transparent to visible light and is configured, upon receipt of light that is reflected off of the eye, to supply an output signal.
Abstract:
An approach where items of different temperatures are bonded to each other such that upon cooling down they contract in size resulting in zero residual stress between the bonded items at an ambient temperature. If materials of the bonded items have different thermal expansion coefficients and the items are put together at different bonding temperatures, then they may have insignificant residual stress upon cooling down to the ambient temperature (e.g., room temperature) because the different ranges of the temperature drops compensate for the different contractions.
Abstract:
A ground contact switch system comprises a first object configured to contact a ground surface during a stride, and one or more switches coupled to the first object. An inertial measurement unit can be coupled to the first object. The one or more switches are configured to detect when the first object is at a stationary portion of the stride. The one or more switches can also be configured to send a signal to activate an error correction scheme for the inertial measurement unit.
Abstract:
A method for providing conductive paths into a hermetically sealed cavity is described. The sealed cavity is formed utilizing a silicon-glass micro-electromechanical structure (MEMS) process and the method includes forming recesses on a glass substrate everywhere that a conductive path is to pass into the cavity, and forming conductive leads in and around the recesses. A glass layer is deposited over the substrate, into the recesses, and over the conductive leads and then planarized to expose portions of the conductive leads. A sealing surface is formed on at least a portion of the glass layer. Silicon is then bonded to the sealing surface of the planarized glass layer, the wafer being configured such that a portion of each lead is within the sealed cavity and a portion of each lead is outside the sealed cavity.
Abstract:
A microactuator array device, which includes a plurality of generally parallel thin flexible polymer sheets bonded together in a predetermined pattern to form an array of unit cells on at least one layer. Thin conductive and dielectric films are deposited on the sheets to form a plurality of electrodes associated with the array of unit cells. A source of electric potential operably connects the electrodes, whereby electrostatic forces are generated most intensely proximate the point where the gap between the sheets is smallest. Inlets and outlets for each cell permit displacement of fluid during generation of the electrostatic forces. In a preferred embodiment, the plurality of sheets forms a stack of layers of arrays of unit cells. The layers are configured such that bi-directional activation is caused by pairs of actuators working opposite each other. At least one of every pair of the sheets may be preformed into corrugations or into flaps to provide a predetermined mechanical bias between the pairs, or the sheets may form curved portions by an applied load to provide a displacement between the pairs. The sheets are preferably from about 1 &mgr;m to about 100 &mgr;m thick and the cells preferably have an individual displacement of from about 5 &mgr;m to about 200 &mgr;m.
Abstract:
Systems and methods for two degree of freedom dithering for micro-electro-mechanical system (MEMS) sensor calibration are provided. In one embodiment, a method for a device comprises forming a MEMS sensor layer, the MEMS sensor layer comprising a MEMS sensor and an in-plane rotator to rotate the MEMS sensor in the plane of the MEMS sensor layer. Further, the method comprises forming a first and second rotor layer and bonding the first rotor layer to a top surface and the second rotor layer to the bottom surface of the MEMS sensor layer, such that a first and second rotor portion of the first and second rotor layers connect to the MEMS sensor. Also, the method comprises separating the first and second rotor portions from the first and second rotor layers, wherein the first and second rotor portions and the MEMS sensor rotate about an in-plane axis of the MEMS sensor layer.