143 results about "Variable intensity" patented technology

The application relates to a system and a method for the phase-contrast imaging by use of X-ray gratings. The system comprises an X-ray device, a first absorption grating, a second absorption grating, a detection unit, a data processing unit and an imaging unit, wherein the X-ray device transmits an X-ray bundle to a detected object; the first and second absorption gratings are positioned in the direction of the X-ray bundle; the X-ray refracted by the detected object forms an X-ray signal with variable intensity through the first absorption grating and / or the second absorption grating; the detection unit receives and converts the X-ray with variable intensity into an electrical signal; the data processing unit processes and extracts refraction-angle information in the electrical signal, and utilizes the refraction-angle information to figure out pixel information; and the imaging unit constructs images of the object. In addition, the system and the method can also realize CT imaging by using a rotating structure to rotate the object so as to obtain refraction angles in a plurality of projection directions and the corresponding images, and use CT reconstruction algorithm to figureout refraction-index fault images of the detected object. According to the invention, the phase-contrast imaging of approximate decimeter-magnitude viewing fields under incoherent conditions can be realized by use of common X-ray machines or multi-seam collimator such as source gratings, as well as two absorption gratings.

Improved method and apparatus for hand-held portable LED illumination. The illumination source includes a plurality of LEDs, and an electrical circuit that selectively applies power from the DC voltage source to the LED units, wherein the illumination source is suitable for handheld portable operation. In some embodiments, the electrical circuit further includes a control circuit for changing a proportion of light output having the first characteristic color spectrum output to that having the second characteristic color spectrum output, and that drives the LEDs with electrical pulses at a frequency high enough that light produced has an appearance to a human user of being continuous rather than pulsed. Still another aspect provides an illumination source including a housing including one or more LEDs; and a control circuit that selectively applies power from a source of electric power to the LEDs, thus controlling a light output color spectrum of the LEDs.

An access point in an optical fiber-based high-speed optical wireless network is disclosed. The access point includes an antenna for receiving communication requirement signals, a switch for selectively outputting a corresponding signal according to the communication requirement signals, a bias control unit for selectively outputting bias current with variable intensity according to whether an output of the signal from the switch exists or not, on the basis of a threshold current; a bias operation unit for outputting input signals to the antenna when an input bias current is smaller than the threshold current and for outputting signals received by the antenna when an input bias current is larger than the predetermined threshold current, and a semiconductor optical amplifier for selectively performing an optical detection function of converting optical signals, which have been received through a first optical fiber from an central station, into electrical signals and sending the converted electrical signals to the bias operation unit, when a current smaller than the threshold current is input to the bias operation unit, and an optical modulation function of transmitting signals output from the bias operation unit through a second optical fiber to the central station, when a current larger than the threshold current is input to the bias operation unit.

An apparatus and method for performing human algometry are disclosed. They include a stimulator configured to apply electrical stimulation of variable intensity to an area of a patient's body, a monitoring device configured to measure a. level of cortical activity in one or more regions of the patient's brain, and a microprocessor connected to the stimulator and the monitoring device that is configured to correlate the intensity of the electrical stimulation with the level of activity in the one or more regions of the patient's brain and to determine at least one of a measurement of pain intensity, a measurement of a sensory detection threshold (SDT), a measurement of a drug's analgesic impact, an indication of an onset of tolerance to a drug, an indication of an onset of analgesic-induced hyperalgesia, an indication of conditions of allodynia, a measurement of dose-response characteristics of pain management drugs, and a characterization of a pain condition.

A proportional force input apparatus for an electronic device includes a mechanism operable by a user of the electronic device, such as a stylus inserted into a spring-loaded socket of the device. The mechanism provides a tactile feedback to the user proportional to a force applied by the user. A variable strength sensor detects the force applied by the user to the mechanism and converts this to an electrical signal proportional to the force applied by the user. A processor operates to input the electric signal from the variable strength sensor and provide force information to an application running on the electronic device. Optionally, a second sensor can detect rotation of the stylus. As a result, a stylus can be used to provide vector information to an application such as a game.

For continuous tracking without noticeable skips during physical changes in head position, the intensities of all subpixels of the matrix screen are reduced in order to form intensity focuses for subpixel groups behind barrier elements, which comprise a number n of subpixels, including a subpixel reserve, in the image lines. In the case of parallel alterations, these intensity focuses are then displaced by a constant absolute value continuously through directly adjacent subpixels and also through subpixel group boundaries with different stereo image views. Distance changes involve the intensity focuses being increasingly widened or compressed relative to the screen edges. The intensities of the individual subpixels can be altered by means of simple multiplication by standardized constant or variable intensity factors which can be ascertained as a function of motion.

A variable-intensity, wide-angle illuminator is disclosed, one embodiment comprising: a light source for providing a light beam; an optical cable, optically coupled to the light source for receiving and transmitting the light beam; a handpiece, operably coupled to the optical cable to receive the light beam; an optical fiber, operably coupled to the handpiece, wherein the optical fiber is optically coupled to the optical cable to receive and transmit the light beam; an optical element, optically coupled to a distal end of the optical fiber, for receiving the light beam and scattering the light beam to illuminate a surgical field, wherein the optical element comprises: a polymer matrix; and a plurality of microbubbles displaced within the polymer matrix; and a cannula, operably coupled to the handpiece, for housing and directing the optical fiber and the optical element. The optical element can be a small-gauge, diffusive optical element having circular or semi-ellipsoidal incident surfaces. For example, the optical element can be a 19, 20 or 25 gauge optical element. Further, the optical element, the cannula and the handpiece can be fabricated from biocompatible materials. The optical cable can comprise a first optical connector operably coupled to the light source and a second optical connector operably coupled to the handpiece (to optically couple the optical cable to the optical fiber housed within the handpiece and cannula).

Apparatus and method for dissolving chemical tablets for creating a variable rate of chemical dissolution in a stream of constant flow rate of untreated liquid, especially water. The apparatus includes a housing in which a container is placed. The container includes a sieve plate or perforated grid which separates the container into an upper chamber in which chemical tablets are stored and a lower mixing chamber. A collection reservoir is defined in an annular outside the container wall and inside of the housing. Several arrangements are illustrated by which a vortex of liquid is generated of controllable variable intensity in the lower or mixing chamber thereby creating uneven liquid pressure beneath the perforated grid as a function of radial distance. As a result, fluid passes aggressively through outer radial perforations or holes in the grid and which impinge on the chemical tablets stacked on the grid. The liquid circulates in the upper chamber from the outward radial position toward the center of the grid plate, while eroding the tablets, and returns to the mixing chamber. A portion of the liquid exits into the collection reservoir. Liquid communication also exits from a hole in the bottom of the lower mixing chamber, which is open to the collection reservoir. Varying the intensity of the vortex varies the rate of chemical dissolution, yet the flow rate of liquid through the apparatus is constant.

Variable display lighting intensity of an information handling system, such as notebook computer, is used to achieve image lighting uniformity for document scanning with a camera that is integrated or otherwise attached or built-in to a display of the information handling system.

In a portable computing device that includes a backlit device having a variable-intensity backlight, a light sensor, and a light controller coupled to the light sensor and the backlight, a method for controlling the intensity of light produced by the backlight involves the steps of (1) with the ambient light sensor determining the ambient light level at the computing device; and (2) with the light controller automatically adjusting the intensity of light produced by the backlight in accordance with the determined light level.

A light emitting diode (LED) warning signal light, the warning signal light comprising a plurality of light sources constructed and arranged with a reflector or culminator, the LED light source being in electrical communication with a controller and a power supply, battery, or other electrical source. The warning signal light provides various colored light signals for independent use or use on an emergency vehicle. The warning light signals may include a strobe light, revolving light, an alternating light, a flashing light, a modulated light, a pulsating light, an oscillating light or any combination thereof. The controller may further be adapted to regulate or modulate the power intensity exposed to the illuminated LED's to create a variable intensity light signal.

A light emitting diode (LED) warning signal light, the warning signal light comprising a plurality of light sources constructed and arranged with a reflector or cullminator, the LED light source being in electrical communication with a controller and a power supply, battery, or other electrical source. The warning signal light provides various colored light signals for independent use or use by an emergency vehicle. These light signals may include a strobe light, revolving light, an alternating light, a flashing light, a modulated light, a pulsating light, an oscillating light or any combination thereof. Additionally, the warning signal light may be capable of displaying symbols, reverse characters, or arrows. The controller may further be adapted to regulate or modulate the power intensity exposed to the illuminated LED's to create a variable intensity light signal.

A sensor module configured to be located behind a window of a vehicle to detect an object through the window and about the vehicle. The module includes a radar unit with an antenna and a controller. The antenna emits and / or receives a radar signal through the window with a selected or preferred polarization. The polarization determines a preferred angle of propagation of the radar signal through the window based on reflection characteristics of the window that vary with impingement angle and transmitted polarization. By varying the transmitted polarization vs. beam direction when a directional antenna is used, the signal propagating through the windshield can be maximized to enhance object detection over a range of signal directions. Also, by varying the transmitted polarization when an omnidirectional type antenna is used, the object can be ‘illuminated’ with variable intensity and detected with variable sensitivity.

A device and method for adjusting the magnetic strength of a magnetic end effector for lift systems is described. The magnetic end effector is capable of lifting discriminate payloads by selectively varying the strength of the magnetic forces output by the magnetic end effector. An actuator can be operatively coupled to the variable strength magnet end effector, wherein the actuator is selectively actuatable to control the adjustment of the variable strength magnet. The actuator may also be configured to maintain the variable strength magnet at a desired magnetic force output strength once achieved for any given amount of time.

The device described herein comprises a dual-compartment container for the storage of women's make-up and an electrically powered therapeutic massage unit. The unit resembles a make-up compact in size and appearance, yet contains a second, less obvious compartment housing an electrically powered, variable speed, variable intensity, vibrator which may be utilized to relieve physical or sexual tension.

A lighting control arrangement controls the user interface lighting in a portable electronic device. An output of the lighting control arrangement selectively provides lighting intensity commands to a lighting controller. Each of the lighting intensity commands indicates one of certain basic lighting intensity levels. A level selector repeatedly changes, at a frequency that is higher than an integration frequency of a human visual system, the lighting intensity command to be provided at said output.

The present invention provides apparatus and method for varying an operating parameter for a nuclear gamma ray tool for evaluating the integrity of gravel packing. The gamma ray output intensity and area of investigation are altered by changing a source housing geometry and the material from which the source housing is made. An actuator is provided to slide a variable electron density sleeve over the source and to vary the area of investigation by changing the distance between the source and a detector.

A variable-intensity, wide-angle illuminator is disclosed, one embodiment comprising: a light source for providing a light beam; an optical cable, optically coupled to the light source for receiving and transmitting the light beam; a handpiece, operably coupled to the optical cable to receive the light beam; an optical fiber, operably coupled to the handpiece, wherein the optical fiber is optically coupled to the optical cable to receive and transmit the light beam; an optical element, optically coupled to a distal end of the optical fiber, for receiving the light beam and scattering the light beam to illuminate a surgical field, wherein the optical element comprises a hemispherically shaped sapphire; and a cannula, operably coupled to the handpiece, for housing and directing the optical fiber and the optical element. The optical element can be a small-gauge, diffusive sapphire element having a polished circular surface co-incident with the distal end of the cannula and a light refracting hemispherical surface facing the optical fiber. For example, the optical element can be a 19, 20 or 25 gauge optical element. Further, the cannula and the handpiece can be fabricated from biocompatible materials. The optical cable can comprise a first optical connector operably coupled to the light source and a second optical connector operably coupled to the handpiece (to optically couple the optical cable to the optical fiber housed within the handpiece and cannula).

A haptic control system and a method for controlling a tactile feedback, wherein the haptic control system and the method control the tactile feedback in response to a vehicle condition, are disclosed. The haptic control system for a vehicle includes a vehicle information system adapted to generate and transmit a vehicle information signal including data and information representing a vehicle condition and a controller adapted to receive the vehicle information signal, analyze the vehicle information signal, and generate and transmit a control signal for controlling a tactile feedback in response to the vehicle information signal.

The invention relates to an X ray phase contrast imaging system and an X ray phase contrast imaging method. The system comprises an X ray device, a grating system, a detection unit, a data processing unit and a relative shifting device, wherein the X ray device emits X ray bundles to a detected object; the grating system comprises a first absorption grating and a second absorption grating and is positioned on a direction of an X ray, and the X ray refracted by the detected object forms a variable-intensity X ray signal through the first absorption grating and the second absorption grating; the detection unit receives the variable-intensity X ray signal and converts the variable-intensity X ray signal into an electrical signal; the data processing unit processes and extracts the refraction angle information in the electrical signal and computes pixel information by utilizing the refraction angle information; and the relative shifting device is used for enabling the detected object to relatively shift relative to the imaging system. The imaging system carries out phase contrast imaging for the detected object within a certain relative shifting range of the imaging system and the detected object at a plurality of positions so as to obtain a plurality of images of the detected object. The images are converted into the images on the same reconstruction plane so as to carry out three-dimensional image reconstruction.

An authentication scheme for unlocking a computing system may require a shortened password in some cases. For example, the computing system may be configured to determine a time that a user has been locked out of a computing device and to determine which of a plurality of time spans that the time falls within. The computing system may also prompt the user for a required password including a full password or a subset of the full password depending on the determined time span. The computing system may be further configured to display a visual indicator corresponding to the determined time span or a required password length on a visual display. A length of the required password for login may be progressively longer for each of the plurality of time spans as a time period that a respective time span covers increases.

The present embodiments disclose apparatus, systems and methods for allowing users to receive targeted delivery of haptic effects—air flow of variable intensity and temperature—from a single tower or surround tower configuration. The haptic tower may have an enclosed, modular assembly that manipulates air flow, fluid flow, scent, or any other haptic or sensation, for an immersed user. Moreover, the system has an application of sensor technology to capture data regarding a user's body positioning and orientation in the real environment. This data and, or data from a program coupled to the system, and, or audio-video data corresponding to a user in a virtual environment, is relayed to a haptic engine; recognized; scored along a plurality of parameters; and converted into a haptic output command for haptic output expression corresponding to the user in the virtual environment.

A highly tensile dielectric layer is generated on a heat sensitive substrate while not exceeding thermal budget constraints. Cascaded ultraviolet (UV) irradiation is used to produce highly tensile films to be used, for example, in strained NMOS transistor architectures. Successive UV radiation of equal or shorter wavelengths with variable intensity and duration selectively breaks bonds in the Si—N matrix and minimizes shrinkage and film relaxation. Higher tensile stress than a non-cascaded approach may be obtained.

A printing apparatus 10 exposes an image onto a photosensitive medium 14, having a printhead 20 with a linear array of exposure sources 40, each exposure source 12 operable at a variable intensity. A shuttle mechanism 16 moves the printhead 20 over the photosensitive medium 14 in a reciprocating motion between one end of a carriage assembly 72 and the other. An encoder 38 is coupled to the shuttle mechanism (16) for providing an index encoder pulse 60 at each of a plurality of increments of position of the shuttle mechanism 16 along the carriage assembly 72. Exposure control logic calculates a shuttle velocity according to index signal timing and adjusts the variable intensity of each exposure source 12 according to the shuttle velocity.

An illuminator and surgical illumination system are disclosed, one embodiment of the surgical illumination system comprising: a light source for providing a light beam; an optical cable, optically coupled to the light source for receiving and transmitting the light beam; a handpiece operably coupled to the optical cable; an optical fiber assembly operably coupled to the handpiece, wherein the optical fiber assembly is optically coupled to the optical cable to receive and transmit the light beam and wherein the optical fiber assembly comprises a plurality of fiber guides, wherein each fiber guide comprises a cladding having one or more fiber cores for transmitting and scattering the light beam to illuminate the surgical field, and a cannula, operably coupled to the handpiece for housing and directing the optical fiber assembly. The surgical illumination system can further comprise a separator operable to maintain a spacing between the fiber guides. The optical fiber assembly, the cannula, and the handpiece can be fabricated from biocompatible materials. The optical fiber assembly can be operably coupled to the handpiece to enable linear displacement of the optical fiber assembly within the cannula. The handpiece can include an adjustment means, such as a push / pull mechanism, for adjusting the linear displacement of the optical fiber assembly. Other adjusting means as known to those in the art can also be used including, for example, a mechanical coupling, an electrical coupling, a magnetic coupling, a pneumatic coupling or any combination thereof. The distal end of the optical fiber assembly can be coincident with an open aperture of the cannula. Adjusting the linear displacement via the adjusting means can thus cause the optical fiber assembly to exit the open aperture by an amount corresponding to the change in linear displacement (a reverse adjustment can retract the optical fiber assembly). Further, a separator can be positioned between the fiber guides in such a way that the fiber guides can be uniformly displaced outward from one another by an amount proportional to the change in linear displacement from the distal end of the cannula.

The invention provides a thermal protection coating surface performance test method including following steps: a), processing a thermal protective coating sample, installing the sample on a cooling base, wherein the sample lower surface and the cooling base form a closed cooling medium channel; b), using a laser beam with variable intensity to heat the sample thermal protective coating surface, then cooling the sample; repeatedly performing the step b) for specified cycle times; measuring temperature values of every measuring point required in the experimental process; observing the change of the thermal protective coating surface state in the experimental process; and c) evaluating the sample thermal fatigue performance and heat insulation performance. The thermal protection coating surface performance test method improves the thermal stress, significantly accelerates the surface thermal fatigue, shortens the testing period, and saves the experimental cost. Movement is not needed in the hot and cold cycle, so that the test system is relatively simple. Two surface properties of thermal protective coating thermal fatigue performance and heat insulation performance can be simultaneously tested.