1598 results about "Single pulse" patented technology

A three dimensional imaging device is presented which uses a single pulse from a pulsed light source to detect objects which are obscured by camouflage, fog or smoke but otherwise enveloped by a light-transmitting medium. The device simultaneously operates in two modes, light reflected from the nearest object is processed to form a three-dimensional image by an array of pixels. This first image is based upon the light-pulse transit time recorded in each pixel. Each pixel also contains a high-speed analog memory that sequentially stores reflected signals at a repeated time interval. The first reflection acts as a time base that controls when the analog memory begins or ends the storage sequence. The first return could be from a camouflage net and the amplitudes of the return signals, after the first return, would then be from objects behind the net. Computer processing these amplitudes reveals the three-dimensional nature of the obscured objects.The device consists of the pulsed light source, optics for collecting the reflected light, a sensor for detecting the light and converting it to electrical data, drive and output electronics for timing and signal conditioning of data generated by the sensors and a computer for processing the sensor data and converting it to a three dimensional image. The sensor collects and processes the light data in a unique manner, first converting it to electricity by a number of alternate detector technologies and then using integrated circuit chips which consist of a two dimensional array of electronic pixels also called unit cells. The two dimensional array defines two dimensions of the image. Stored within each unit cells is data associated with the third dimension, ranges of targets, and amplitudes of target reflections. This data is read out of the integrated circuit chip in the time interval between laser pulses to a processing computer. The processing computer corrects the data and, by means of computer algorithms specific to the device, converts the data to a three-dimensional image of one or more targets. This image may be viewed or processed electronically to isolate targets.

The present invention determines the dimensions and volume of an object by using a novel 3-D camera that measures the distance to every reflective point in its field of view with a single pulse of light. The distance is computed by the time of flight of the pulse to each camera pixel. The accuracy of the measurement is augmented by capture of the laser pulse shape in each camera pixel. The camera can be used on an assembly line to develop quality control data for manufactured objects or on a moving or stationary system that weighs as well as dimensions the objects. The device can also ascertain the minimum size of a box required to enclose an object.

A method and apparatus is provided for detecting a pulse in a signal. In one aspect of the invention, a method comprises digitizing the signal into a plurality of samples; repeatedly convolving each one of at least a portion of the buffered samples R times, wherein R>1; and detecting the received signal's center of energy from the convolution results. In a second aspect, an apparatus comprises a analog-to-digital converter capable of digitizing the received signal to produce a plurality of samples; a convolution circuit, including a matched filter for convolving the digitized signal at a second sampling rate; a buffer capable of storing the samples and serially outputting each of the samples R times, where R>1, to the convolution circuit; and a detector for detecting the digitized signal's center of energy from the output of the convolution circuit.

A pressure sensing apparatus for operative arrangement within an environment, having: a sensor comprising a hermetically-sealed receptacle, at least one side of which has an flexible membrane to which a magnetically hard element is attached. Enclosed within the receptacle is a magnetostrictive element that vibrates in response to a time-varying magnetic field. Also included is a receiver to measure a plurality of successive values for magneto-elastic emission intensity of the sensor taken over an operating range of successive interrogation frequencies to identify a resonant frequency value for the sensor. Additional features include: (a) the magnetically hard element may be adhered to an inner or outer side of, or embedded within, the membrane; (b) the magnetostrictive element can include one or more of a variety of different pre-formed, hardened regions; (c) the magneto-elastic emission may be a primarily acoustic or electromagnetic emission; and (d) in the event the time-varying magnetic field is emitted as a single pulse or series of pulses, the receiver unit can detect a transitory time-response of the emission intensity of each pulse (detected after a threshold amplitude value for the transitory time-response is observed). A Fourier transform of the time-response can yield results in the frequency domain. Also, an associated method of sensing pressure of an environment is included that uses a sensor having a magnetostrictive element to identify a magneto-elastic resonant frequency value therefore. Using the magneto-elastic resonant frequency value identified, a value for the pressure of the environment can be identified.

A method and device for presenting music to a patient in real time synchrony with relation to every single pulse of the patient's heartbeat, thereby inducing an enjoyable and relaxing sensation. A digitized electric signal representative of the patient's heartbeat is fed to a microprocessor which brings the digitized electric signal into correspondence with a sequence of musical sound configurations so that each pulse beat is followed by one of the sound configurations in real time. The sequence of musical sound configurations is presented to the patient so that each sound configuration is played in real-time synchrony with a respective pulse beat.

An excitation circuit for a flux switching motor. The circuit includes a low-value film capacitor across the DC side of a bridge rectifier. A plurality of electronic switches are arranged in an H-bridge configuration for switching current flow through an armature winding of the motor in accordance with a PWM control scheme and single-pulse control scheme controlled by a microcontroller. A start-up diode is placed across the field winding of the motor and is electronically switched out of the circuit after a startup phase of the motor has completed. The circuit implements armature energy recirculation through the field winding during startup to promote more uniform and quicker startup of the motor. The use of a film capacitor improves the power factor of the circuit, helps to eliminate the introduction of harmonics into the AC voltage source, and helps in mitigating EMI. Reverse commutation is used to bring the motor to a quick stop when it is powered off.

A method and apparatus for ranging finding of signal transmitting devices is provided. The method of signal reception is digitally based only and does not require receivers that are analog measurement devices. Ranging can be achieved using a single pulse emitting device operating in range spaced relation with a minimum of a single signal transmitter and a single digital receiver and processing circuitry. In general a plurality of transmitting pulsed emitters may be ranged and positioned virtually simultaneously in 3-dimensions (XYZ coordinates) using a configuration of a plurality of digital receivers arranged in any fixed 3-dimensional configuration. Applications may involve at least one single transmitter to receiver design to determine range, or at least one transmitted reflecting signal off from an object to determine range.

The present invention relates to an aerosol therapy device, wherein an aerosol is generated in an aerosol generating device and is supplied through a nosepiece to a patient's nasal cavities via a single pulsed main aerosol flow.

The invention discloses a small low-altitude light area array laser radar measuring system. The master control sub-system of the measuring system triggers a pulse laser emitting module to emit lasers, the lasers are collimated and generate two paths of laser signals through a beam splitting sheet, one path is used for determining the time of emitting the lasers and generating timing starting signals, the other path irradiates an object through beam expansion, echo signals are received by an APD array detection module and generate N2 paths of stopping pulses, and a multi-channel high-precision time interval measuring module is combined with starting signals to measure the round-trip flight time difference of N2 paths of lasers of a rectangular detection area. The location attitude measuring sub-system, the master control sub-system and the area array laser radar distance-measuring sub-system of the measuring system are integrated, original three-dimensional information can be obtained in real time, and assembling and verification are eliminated. The laser radar measuring system does not need scanning, three-dimensional imaging can be achieved through a single pulse, the imaging speed is high, measuring precision and working efficiency are high, the size is small, the weight is small, and the small low-altitude light area array laser radar measuring system is suitable for being carried small low-altitude light remote sensing platforms.

Methods and apparatus are provided for radar systems using multiple pulses that are shorter than the expected range delay extent of the target to be imaged. In one implementation, a method for performing radar includes the steps of: transmitting a plurality of pulses, each pulse having a different center frequency and a time duration shorter than an expected range delay extent of a target, wherein a total bandwidth is defined by a bandwidth occupied by the plurality of pulses; receiving reflections of the plurality of pulses; and performing pulse compression on the received pulse reflections to generate a detection signal having a radar resolution approximately equivalent to the transmission and reception of a single pulse having the total bandwidth. In preferred form, the pulses comprise ultrawideband (UWB) pulses each occupying a sub-band of the overall system bandwidth.

A material processing system and method is disclosed for processing materials such as amorphous silicon in an annealing processes and lithography processes on a silicon wafer, as well as ablation processes. A first laser generates periodic pulses of radiation along a beam path directed at the target material. Similarly, at least one additional laser generates periodic pulses. A beam aligner redirects the beam path of the at least one additional laser, such that the beam from the at least one additional laser is directed at the target along a path colinear with the first laser's beam path. As a result, all the lasers are directed at the target along the same combined beam path. The periodic pulses of the at least one additional laser are delayed relative to the first laser such that multiple pulses impinge on the target within a single pulse cycle of any given laser.

A frame loss compensating method wherein even when audio codec, which utilizes past sound source information of adaptive codebook or the like, is used as a main layer, the degradation in quality of the decoded audio of a lost frame and following frames is small. In this method, it is assumed that a pitch period ‘T’ and a pitch gain ‘g’ have been obtained as encoded information of a current frame. The sound source information of a preceding frame is expressed by use of a single pulse, and a pulse position ‘b’ and a pulse amplitude ‘a’ are used as encoded information for compensation. Then, an encoded sound source signal is a vector that builds up a pulse having an amplitude ‘a’ at a position that precedes by ‘b’ from the front position of the current frame. This vector is used as the content of the adaptive codebook, so that a vector, which builds up a pulse having an amplitude (g×a) at the position of the current frame (T−b), can be used as an adaptive codebook vector at the current frame. This vector is used to synthesize a decoded signal. The pulse position ‘b’ and pulse amplitude ‘a’ are then decided such that a difference between the synthesized signal and an input signal becomes minimum.

A feedback controller in a PWM amplifier comprises a signal input for receiving a pulse width modulated (PWM) input signal (Vin) whose duty cycle represents a desired analogue output signal. A feedback loop filter 518 generates a filtered error signal (Vint) comprising a filtered representation of differences between the input signal (Vin) and a feedback signal (Vfb). A comparator (520) compares the filtered error signal with a reference to generate a provisional PWM switching control signal (C) for controlling the PWM amplifier (500). A pulse conditioner (532) receives both the provisional PWM switching control signal (C) and the PWM input signal (X=Vin) and outputs to the amplifier (500) a conditioned PWM switching control signal (Y), modified in accordance with predetermined constraints in relation to the PWM input signal. The pulse conditioner includes a single pulse function (534) whereby only a single pulse is permitted for every pulse in the input signal, thereby eliminating oscillations that can otherwise Occur under over-voltage supply conditions. Missing pulse and minimum pulse width functions (536, 538) can also be provided.

The invention discloses a multi-line laser radar system for automobiles, which is characterized in that a laser device, a spherical reflector and a parabolic reflector form a set of simple and effective beam shaping system to enable laser beams to be aligned in the horizontal direction and divergent in the direction of an optical axis of the system, an output light spot is a linear light spot, and the distance among a plurality of angle targets in the direction of a vertical axis can be detected by transmitting single pulses. The laser device generates linear beams used as radar scanning signals, the parabolic reflector is used for collecting echo signals of objects, the collected echo signals firstly pass through an optical filter and then incidence onto a photoelectric receiver array, and a motor drives a transmitting light path part and a receiving light path part to integrally rotate, thereby completing multi-line target scanning. In the invention, the linear beams are used as the radar scanning signals, the off-axis parabolic reflector is used for collecting the echo signals, and the photoelectric receiver array is used for receiving the echo signals. The multi-line laser radar system for the automobiles has the advantages of high detection efficiency, short light path, light weight, small volume and the like and is suitable for various automobiles.

Described herein are methods and systems for applying extremely low duty-cycle stimulation sufficient to treat chronic inflammation. In particular, described herein are single supra-threshold pulses of electrical stimulation sufficient to result in a long-lasting (e.g., >4 hours, greater than 12 hours, greater than 24 hours, greater than 48 hours) inhibition of pro-inflammatory cytokines and / or effects of chronic inflammation. These methods and devices are particularly of interest in treatment of inflammatory bowel disease (IBD).

The invention discloses a wide band single pulse flat plate slot array antenna which comprises four wide band low profile flat plate slot antenna sub-arrays and a single pulse waveguide comparator. Each wide band low profile flat plate slot antenna sub-array further comprises a wide band low profile flat plate slot antenna unit and a waveguide feed network, and each wide band low profile flat plate slot antenna unit further comprises a square radiating cavity, radiating slots, a stimulation waveguide cavity, a stimulation slot and a feed waveguide. Each waveguide feed network is formed by a plurality of equal-arm-length equal-power-division and equal-arm-length unequal-power-division waveguide H-T powder dividers in a cascading mode, the single pulse waveguide comparator is formed by three plane magic Ts and an equal-arm-length equal-power-division waveguide H-T power divider, output openings of the single pulse waveguide comparator are connected with the wide band low profile flat plate slot antenna sub-arrays, and a sum beam, an azimuth difference and a pitching difference beam are formed at three input ports. Compared with a traditional single pulse waveguide slot antenna, the wide band single pulse flat plate slot array antenna has the wider band and is higher in efficiency, easier to design and easier to manufacture.

An information recording device comprising at least a recording pulse generating means and a recording pulse selecting means capable of generating various multi-pulses each of which is a combination of a leading heating pulse and a succeeding heating pulse, and rectangular pulses each of which is a single pulse, as a recording pulse, is disclosed. The recording pulse selecting means switches and selects among the multi-pulses and the rectangular pulses according to a recording condition, and then causes a light emission of a laser light source through a light source driving means. Even though in a high recording linear velocity recording condition that is insufficient in power for the recommended multi-pulse recording, a very low recording power can still be used by switching to the rectangular pulse recording, so as to achieve a recording with a much higher recording speed. In addition, good recording marks can be formed without exceeding a maximum allowable recording power.

The invention discloses a wide band low profile flat plate slot array antenna which comprises wide band low profile flat plate slot antenna units and waveguide feed networks. Each wide band low profile flat plate slot antenna unit comprises a radiating square cavity, radiating slots, a stimulating waveguide cavity, a stimulating slot and a feed waveguide, wherein each waveguide feed network is composed of a plurality of equal-power-dividing and unequal-power-dividing waveguide H-T power dividers and connected with each power feeding waveguide, and the waveguide feed networks and the power feed waveguides are located in the same layer. Signals enter the feed waveguides through the waveguide feed networks and are transmitted to the stimulating waveguide cavities through the stimulating slots, the radiating slots enable the signals to be coupled out from the stimulating waveguide cavities, and then the signals are radiated to the free space through the radiating square cavities. The wide band low profile flat plate slot array antenna has the advantages of being wide in band, high in efficiency, low in profile and easy to machine, and is capable of being expanded to be a single pulse antenna after being combined with a comparator.

The invention discloses a radar foresight super-resolution imaging method which specifically includes: distance toward pulse compression, distance walking corrosion, distance toward inverse fast fourier transform (IFFT), determination of iterations and azimuth deconvolution. The radar foresight super-resolution imaging method performs azimuth modeling on echo scanned by a radar antenna in foresight mode to enable the echo to be in convolution, and estimates front ground feature distribution information in a deconvolution method; and additionally, based on noise statistical property, optimum iterations can be determined according to iteration deconvolution, so that radar can obtain better foresight super-resolution imaging performance. Compared with the background technology, the radar foresight super-resolution imaging method overcomes the restrains on scene of a single-pulse imaging technology and limitation on platform dimension of an array imaging method, further solves the problems of complex synchronization, motion compensation and the like of double-foundation synthetic aperture radar (SAR) and can effectively obtain ground feature distribution information of the area dead ahead the platform.

The invention provides a preparation method of a super-hydrophobic micro-nano structure on a titanium alloy surface. The preparation method comprises the following steps: performing ultrasonic cleaning on a titanium alloy sample respectively with acetone and anhydrous alcohol, to obtain a titanium alloy sample with a clean surface; performing femtosecond laser photoetching processing on the surface of the titanium alloy sample with the clean surface, to obtain the titanium alloy sample with the surface having the super-hydrophobic micro-nano structure in one step, wherein a femtosecond laser beam is fixed and perpendicular to the surface of a processed material, the single pulse energy of the femtosecond laser beam is 100mu J-800mu J, the pulse width is 100fs-500fs, the central wavelength is 500nm-1000nm, the repetition frequency is 500Hz-2kHz, and the size of the etched facula of the femtosecond laser beam is 0.5mum-300mum; the surface of the titanium alloy sample moves relative to the etched facula of the femtosecond laser beam along the three-dimensional directions x, y and z, the motion positioning precision in x and y directions is 50nm-100nm, and the motion positioning precision in z direction is 5nm-10nm.

This invention describes a method for operating a weapon targeting system comprising the steps of using a laser to fire a single pulse at a target to obtain a reflected laser pulse; detecting the reflected laser pulse as a signal by a SWIR focal plane; detecting background illumination by using the SWIR focal plane; scene clutter filter and using optical filtering if it is necessary to suppress background illumination.

An automatic auto-correcting method is presented to improve the accuracy of fiber optic distributed temperature measurements derived from Raman back scatterings utilizing two light sources with different wavelengths, by appropriate choice of the wavelengths of the two sources, the use of single pulse modulating circuit for the two light sources, and use of one of the light sources as a primary measurement system and the second light source as an occasional correcting source.

The invention discloses a manufacturing method of oriented silicon steel sheets for a low-noise transformer. Grooves in special shaped are formed in a single side or double sides of silicon steel sheets in a mark carving method; the bottom surfaces of the grooves are parallel to approximately parallel to the surfaces of the silicon steel sheets; the angle with the maximum absolute value in included angles between the single side or multiple sides of the inner walls of the groove and the normal plane is defined to be the included angle theta; the include angle theta is in a range of being greater than or equal to -60 degrees but smaller than 0 degree; the included angle theta of each side edge is identical or different; the normal plane refers to a plane vertical to the rolling direction of the silicon steel sheets. The mark carving processing mode is set before or after the decarburizing annealing, or is after the high-temperature annealing, or is after the insulation coating flattening annealing. Pulse laser beams with the single-pulse instantaneous peak value power density not lower than 2.0*10<6>W / mm<2> are used for processing on the surface of the silicon sheets; the laser injection total energy is between 0.002J / mm to 1.3J / mm. The oriented silicon steel sheets manufactured by the method have the advantages that the iron loss is low; after the stress relief annealing, the performance is not reduced; in addition, under the same manufacturing and test conditions, the noise level of the transformer is lowered.