Abstract: An example system can monitor the stress and fatigue of a subject. The system can include a light source configured to direct illuminating light onto a face of the subject. The illuminating light can reflect off the face of the subject to form reflected light. The system can include collection optics that collect a portion of the reflected light and produce video-rate images of the face of the subject. The system can include an image processor configured to locate an eye in the video-rate images, extract fatigue signatures from the located eye, and determine a fatigue level of the subject, in part, from the fatigue signatures. The image processor can also be configured to locate a facial region away from the eye in the video-rate images, extract stress signatures from the located facial region, and determine a stress level of the subject from the stress signatures.

Abstract: A first controller can have a greater number of output lines than a second controller has input lines. The first controller can receive an ultrasonic transducer control signal and provide a first portion of the control signal to the first processor, where the length of the first portion is less than or equal to the number of input lines of the second processor. The first processor can send portions of the control signal to a plurality of second processors. Each of the plurality of second processors can have a number of input lines less than the number of output lines of the first processor. Portions of the control signal can be sent through the output lines of the first processor to the plurality of second processors at substantially the same time.

Abstract: An ultrasonic transducer having a membrane and a container having a base and at least one wall element. The one or more wall elements can be situated over at least part of the base to form a cavity that can have an at least partially open end. The open end can be sealed with the membrane and the interior of the container can be maintained at a lower atmospheric pressure than the ambient pressure. Within the container, a piezoelectric flexure can be fixed at one end to a location at a wall element. The other end of the flexure can be in mechanical communication with the membrane, either directly or through a stiffener that is itself in communication with the membrane.

Abstract: An ultrasonic transducer that can include a driver side and a bias voltage side. A higher voltage source can be electrically connected to the bias voltage side through a first resistor. A lower voltage source can be electrically connected to the driver side of through a second resistor. A field effect transistor or other suitable switch can be included, having a source, a gate and a drain. The source can be electrically connected to ground and the gate can be electrically connected to a control signal source. The drain can be electrically connected to the lower voltage source through a second resistor and be electrically connected to the driver side of the ultrasonic transducer. The gate can be electrically connected to a signal source through a third resistor.

Abstract: An array of ultrasonic transducers can be controlled to produce a steerable beam. Beam steering can be skewed by buffer delays in the distribution of a clock signal. The skew can be at least approximately linearized by distributing the clock signal in a diagonal fashion across an array of buffers corresponding to ultrasonic transducer controllers. Potential error in beam steering that can arise from clock skew can be corrected based on the linear tilt.

Abstract: A method for processing data includes receiving a data element in a first processing node, the data element including data, reading a first control word in data element and perform a first processing task with the data with a processing portion of the first processing node, the first processing task associated with the first control word, adding a first sub-header associated with the first processing task to the data element, adding metadata associated with the first processing task to the data element, removing the first control word from the data element, determining whether a second processing task should be performed with the data, and adding a second control word to the data element responsive to determining that a second processing task should be performed with the data.

Abstract: Some embodiments relate to a method of collecting light reflected from a subject and analyzing the light to monitor time-varying physiological parameters of the subject. Other embodiments relate to a system including collection optics to receive light reflected from a subject, filters to filter the light around a number of wavelengths, image capture zones to receive filtered light from the filters and to generate data to represent the filtered light and an image and signal processing system to monitor time-varying physiological parameters of the subject indicated by the data.

Abstract: Some embodiments pertain to an optical zoom system. The optical zoom system includes a first inward-facing surface that is at least partly reflective and a second inward-facing surface that is at least partly reflective. The optical zoom system further includes a first aperture that includes a plurality of sub-apertures which are positioned around at least a portion of an outer periphery of one of the first and second inward facing surfaces. Each sub-aperture includes an optically powered element. The optical zoom system further includes a second aperture that exists proximate a central region of the optical zoom system. Light is reflected on the first and second inward facing surfaces as the light travels between the first aperture and the second aperture such that the light is optically combined into a single image before exiting the second aperture.

Abstract: Embodiments of a multi-plenoptic system with image stacking and method for wide field-of-regard (FOR) high-resolution image are generally described herein. The multi-plenoptic system may include a subfield separator to decompose an image within a wide field of view into a plurality of multi-pixel subfields. The subfield separator may rotate a chief ray within each multi-pixel subfield by a differing amount relative to a rotation of other rays of the subfield. The multi-plenoptic system may also include a subfield modulator to selectively block or pass light from at least a portion of one or more of the subfields and a subfield image formation element to relay the portions of the subfields that are passed by the subfield modulator onto substantially overlapping areas of a common image plane. A single focal-plane array (FPA) may be aligned with the common image plane to provide for high-resolution imaging over a wide FOR.

Abstract: Some embodiments pertain to an optical zoom system. The optical zoom system includes a first inward-facing surface that is at least partly reflective and a second inward-facing surface that is at least partly reflective. The optical zoom system further includes a first aperture that includes a plurality of sub-apertures which are positioned around at least a portion of an outer periphery of one of the first and second inward facing surfaces. Each sub-aperture includes an optically powered element. The optical zoom system further includes a second aperture that exists proximate a central region of the optical zoom system. Light is reflected on the first and second inward facing surfaces as the light travels between the first aperture and the second aperture such that the light is optically combined into a single image before exiting the second aperture.

Abstract: A method of fabricating a high-frequency piezoelectric resonator includes the steps of (a) forming a region of reduced thickness in a central portion of a quartz disk, a step zone being formed at the transition between the thinned region and the non-thinned region; (b) depositing a conductive tongue on the step so as to extend over a portion of the non-thinned region and over a portion of the thinned region; (c) mounting two lead attachments on the disk; and (d) depositing first and second electrodes on the disc, each electrode coupled to a respective one of the lead attachments, a portion of the first electrode being deposited on the conductive tongue.

Abstract: The high-frequency piezoelectric resonator comprises a quartz plate or disk having a region of reduced thickness which forms a diaphragm and is joined to the remainder of the plate or disk by means of a zone forming a step. A conductive electrode extends from the exterior of the disk or plate to the center of the thinned region and is provided with a conductive tongue constituted by a metallic film-layer of controlled thickness and disposed in the stepped zone. The method involves formation of the disk or plate by ion machining whereas the electrodes and the conductive tongue are formed by the sputtering technique.

Abstract: The device for displaying the distribution of current density of a beam of electrically charged particles comprises a support plate of electrically insulating material having a surface area at least equal to the cross-sectional area of the beam and m.times.n=q electrically conducting elements e which are fixed on the support plate in a lattice array of m lines and n columns. These elements e.sub.mn intercept portions of the beam and are each electrically connected to a system designed to process the electrical signals collected by said elements and to display the current density at m.times.n points of the beam cross-section.

Abstract: The present invention relates to the monitoring of the machining of a wafer of piezoelectric material by a beam of charged particles. The monitoring method is performed by measuring and displaying the complex voltage-current relationship produced by the electrical excitation of the wafer using a variable-frequency measuring signal applied to electrodes carried by the wafer.