2151 results about "Short Waves" patented technology

A sensor system that provides an adjustable threshold level for the sensed quantity is described. The adjustable threshold allows the sensor to adjust to ambient conditions, aging of components, and other operational variations while still providing a relatively sensitive detection capability for hazardous conditions. The adjustable threshold sensor can operate for extended periods without maintenance or recalibration. A portable monitoring unit working in communication with the sensor system provides immediate communication of conditions detected by the sensors. The portable monitoring unit allows building or complex management to be in communication with a sensor system at all times without requiring someone to be physically present at a monitoring site. The portable monitoring unit can be equipped with an auditory device for alerting management or a screen for displaying pertinent information regarding an occurring situation so that management can quickly identify and resolve the problem. In addition, the portable monitoring unit can also be equipped with function keys that allow the portable monitoring unit to send instructions back to the sensor system. In one embodiment, the portable monitoring unit also includes a second transceiver for communications over a short wave radio frequency, or with a cellular phone system.

A sensor system that provides an adjustable threshold level for the sensed quantity is described. The adjustable threshold allows the sensor to adjust to ambient conditions, aging of components, and other operational variations while still providing a relatively sensitive detection capability for hazardous conditions. The adjustable threshold sensor can operate for extended periods without maintenance or recalibration. A portable monitoring unit working in communication with the sensor system provides immediate communication of conditions detected by the sensors. The portable monitoring unit allows building or complex management to be in communication with a sensor system at all times without requiring someone to be physically present at a monitoring site. The portable monitoring unit can be equipped with an auditory device for alerting management or a screen for displaying pertinent information regarding an occurring situation so that management can quickly identify and resolve the problem. In addition, the portable monitoring unit can also be equipped with function keys that allow the portable monitoring unit to send instructions back to the sensor system. In one embodiment, the portable monitoring unit also includes a second transceiver for communications over a short wave radio frequency, or with a cellular phone system.

Cleaning apparatus includes a cleaning head, a light source and a light guide. The cleaning head has a flexible contact member including photo-activating catalyst (photocatalyst). The light source emits short wave light rays to activate the photocatalyst. The light guide transmits the light rays from the light source to the contact member(brushes). The cleaning head may have a transparent brush supporter to support a group of brushes with many photocatalyst particles. The light guide may preferably include a transparent rod and / or an optical fiber. The cleaning apparatus may be applied for a vacuum cleaner. Therefore, such dirty component can be cleaned as bacteria, molds etc. by use of the cleaning apparatus of the invention.

A device and method for generating extremely short-wave ultraviolet electromagnetic wave uses two intersecting plasma beams generated by two plasma accelerators. The intersection of the two plasma beams emits electromagnetic radiation and in particular radiation in the extreme ultraviolet wavelength. In the preferred orientation two axially aligned counter streaming plasmas collide to produce an intense source of electromagnetic radiation at the 13.5 nm wavelength. The Mather type plasma accelerators can utilize tin, or lithium covered electrodes. Tin, lithium or xenon can be used as the photon emitting gas source.

An ultra wide bandwidth, high speed, spread spectrum communications system uses short wavelets of electromagnetic energy to transmit information through objects such as walls or earth. The communication system uses baseband codes formed from time shifted and inverted wavelets to encode data on a RF signal. Typical wavelet pulse durations are on the order of 100 to 1000 picoseconds with a bandwidth of approximately 8 GHz to 1 GHz, respectively. The combination of short duration wavelets and encoding techniques are used to spread the signal energy over an ultra wide frequency band such that the energy is not concentrated in any particular narrow band (e.g. VHF: 30-300 MHz or UHF: 300-1000 MHz) and is not detected by conventional narrow band receivers so it does not interfere with those communication systems. The use of pulse codes composed of time shifted and inverted wavelets gives the system according to the present invention has a spatial resolution on the order of 1 foot which is sufficient to minimize the negative effects of multipath interference and permit time domain rake processing.

The invention discloses a vehicle-road collaborative vehicle-mounted terminal application system based on LTE-V. In the system, the vehicle maintains wireless short-wave communication with other vehicles and roadside equipment in real time by utilizing the characteristics of low delay and high coverage range of LTE-V communication, and interacts information with a vehicle-road collaborative background server through a 4G network. The method comprises the following steps: receiving real-time state information of other vehicles; The method comprises the following steps of: sensing surrounding traffic conditions by traffic participant real-time information sent by roadside equipment, and judging and analyzing a map road relationship, a road distance and collision time between a vehicle and other traffic participants, traffic signs or events according to the vehicle state information and local lane track point map information; According to different traffic scenes judged by the system, a driver is reminded of different traffic events and early warning information through visualization, so that the driving safety is enhanced, and meanwhile, the traffic efficiency is improved.

This invention relates to luminescent materials for ultraviolet light or visible light excitation containing lead and / or copper doped chemical compounds. The luminescent material is composed of one or more than one compounds of aluminate type, silicate type, antimonate type, germanate / or germanate-silicate type, and / or phosphate type. Accordingly, the present invention is a good possibility to substitute earth alkaline ions by lead and copper for a shifting of the emission bands to longer or shorter wave length, respectively. Luminescent compounds containing copper and / or lead with improved luminescent properties and also with improved stability against water, humidity as well as other polar solvents are provided. The present invention is to provide lead and / or copper doped luminescent compounds, which has high color temperature range about 2,000K to 8,000K or 10,000K and CRI over 90.

A receiver for broadcast signals, e.g. DAB, FM, DVB, and digital or analog short-wave RF broadcast signals according to the present invention includes a polyfunctional circuit (5) that can be switched into three modes and performs the digital frequency demodulation which is needed for the reception of a frequency modulated signal in a first mode A, a digital frequency adjustment of the receiver in case of the reception of a digital or analog modulated broadcast signal like DAB, DVB, DRM or AM in a second mode B and the digital frequency adjustment and the digital gain control of the receiver which is needed in case of the reception of a digitally modulated broadcast signal like DAB, DVB, DRM in a third mode C. Depending on the needed functionality not all of these modes need to be realized. Nevertheless, the same hardware will be used for different purposes although the circuit is realized with an optimized amount of hardware to realize an efficient receiver.

Water-based invisible red fluorescent inks provide machine-readable, inverse contrast invisible images and can be printed using conventional ink jet printers. The inks employ rare earth complexed ligand fluorophores having narrow excitation and emission spectra. In one embodiment the images are printed with an ink comprising water and a water-soluble organic fluorescent fluorophore, which when printed and dried on paper is invisible to the eye and fluoresces in the green to infrared range, e.g., from about 550 to 1200 nm, when irradiated with short wave length UV radiation, e.g., from 230 nm to 280 nm. The highly specific excitation and emission rates, coupled with a high inverse contrast on papers of all colors, makes them particularly useful as ink jet inks for postal and other purposes.

The invention relates to the technical field of protection films, and particularly relates to a golden blue ray-resistant protection film and a preparation method thereof. The golden blue ray-resistant protection film comprises a main film layer, a protection film layer and a release layer, wherein a blue ray-resistant layer is arranged on the upper surface of the main film layer; a first adhesive layer is arranged between the blue ray-resistant layer and the protection film layer; a second adhesive layer is arranged between the lower surface of the main film layer and the release layer; the blue ray-resistant layer is prepared from 2-10 parts by weight of nano CeO2:Er fluorescent powder and 100 parts by weight of acrylic ester; the acrylic ester is one or a mixture of more of urethane acrylate, epoxy acrylate, methacrylate and polyester acrylate. The preparation method is simple in preparation technology, and low in production cost; large-scale popularization and application are facilitated; the prepared protection film has an effect of resisting the blue ray, and has absorption and conversion functions on bluish violet high-energy short waves; the filtration rate at the blue ray wave band of 360-500nm can be up to over 90%. Therefore, the eye health is well protected.

An economical, flexible, breathable polymer film composite modified in at least one of its surfaces by the formation of pores opening out in a funnel shape at the surface thereof, with a nanoscale particle system and which is particularly suitable for packaging purposes. The modification further includes at least one composite layer construction made from a binding agent layer of chemically inert inorganic nanoparticles and a lining layer of hydrophilic non-toxic metal oxide particles which are photocatalytically active under short wave light radiation and which have an anti-bacterial and self-cleaning effect.

A device and method for generating extremely short-wave ultraviolet electromagnetic wave, utilizing a theta pinch plasma generator to produce electromagnetic radiation in the range of 10 to 20 nm. The device comprises an axially aligned open-ended pinch chamber defining a plasma zone adapted to contain a plasma generating gas within the plasma zone; a means for generating a magnetic field radially outward of the open-ended pinch chamber to produce a discharge plasma from the plasma generating gas, thereby producing a electromagnetic wave in the extreme ultraviolet range; a collecting means in optical communication with the pinch chamber to collect the electromagnetic radiation; and focusing means in optical communication with the collecting means to concentrate the electromagnetic radiation.

An antireflective member according to the present invention has an uneven surface pattern, in which unit structures are arranged in x and y directions at respective periods that are both shorter than the shortest wavelength of an incoming light ray, on the surface of a substrate and satisfies the following inequality (1): lambda, / lambda ) . . ., where lambda is the shortest wavelength of the incoming light ray, theta i is the largest angle of incidence of the incoming light ray, ni is the refractive index of an incidence medium, lambda is the period of the uneven surface pattern in the x direction, and lambda is the period of the pattern in the y direction. As a result, diffraction of short-wave light components can be reduced in a broad wavelength range.

Several methods are disclosed for the generation of coherent short-wavelength electromagnetic radiation through optical nonlinear frequency mixing means. The invention involves several stages of efficient nonlinear frequency conversion to shift the output of high-power infra-red fiber-lasers into the vacuum ultraviolet (VUV). The described laser source architecture is designed around non-critically phase-matched (NCPM) sum-frequency mixing (SFM) interactions in the nonlinear crystal CLBO. The NCPM interaction is an optimum condition for bulk frequency conversion of cw radiation because it allows tight focusing of the input laser radiation without Poynting vector walk-off, thereby increasing the non-linear drive significantly. The sub-200-nm output wave is generated from SFM of a long-wave IR laser field and a short-wave UV laser field. The long-wave laser beam may be derived directly from a rare-earth-doped fiber laser, whereas the short-wavelength UV beam is provided as the fourth frequency harmonic of a second rare-earth-doped fiber laser system.

The invention provides an ultra-short wave electromagnetic interference cancelling device, comprising a sampler and an interference cancelling host. The interference cancelling host comprises a quadrature bridge, an I-path bipolar attenuator, a Q-path bipolar attenuator, an I-path correlation operation circuit, a Q-path correlation operation circuit, a first combiner, a second combiner, a directional coupler and a power divider. The sampler samples interference signals from an interference transmitter; the quadrature bridge, the I-path bipolar attenuator, the Q-path bipolar attenuator and the first and second combiners are used for adjusting the amplitude and phase of the sampled signal so that the sampled signals have the same amplitudes and opposite phases as the interference signals in a receiving antenna; the I-path and Q-path correlation operation circuits carry out an correlation operation on an error signal and the sampled signal; the operation results separately control the I-path and Q-path bipolar attenuators to form a negative feedback loop and maximize cancellation of the interference signal. The invention improves the interference rejection ratio and rejects the coupling interference between a receiving antenna and a transmitting antenna in a common field without reducing the utilization ratio of low frequency spectrum resources.

The invention relates to an application of a carbazole oxime ester compound serving as a photoinitiator in a photopolymerisable acrylate composition, the photopolymerisable acrylate composition containing the carbazole oxime ester compound and an application thereof. The composition presents excellent suitability by the combination of the specific photoinitiator and specific photopolymerisable acrylate monomer, and has high storage stability, higher light sensitivity in a short wave position, and excellent dissolvability performance; and when the composition is polymerized, the composition has the advantages of fast solidification speed, little pollution, energy conservation, high exposal efficiency and small exposal dosage, meanwhile, the solidified image pattern is fine and complete without defect and scum, and the membrane has good hardness.

Digital musical footwear is disclosed having hidden compartments which house a thin integrated multi-plane electronic circuit board assembly (2) and a rechargeable lithium ion battery pack. A transmitter antenna is attached to a hand held device such as a smart phone which antenna sends wireless short wave sound signals to a receiving antenna part of the circuit board assembly. Multiple mini-speakers (6, 7) are footwear mounted to play the music. Bluetooth® version 4.0 wireless protocol technology is employed in the circuit board assembly. The circuit board can be flat and hidden in a recess of a heel or curved and hidden in a wall recess of the footwear as can the battery pack. Advanced lithium ion batteries such as silicon wafer or silicon core-shell nanowire batteries may be used to reduce battery weight. Flexible flat speakers (65) such as the FleXpeaker® may also be used to further reduce weight.

A method and apparatus for assessing standing tree stems for readiness for harvesting, or for determining cutting points for processing of felled tree stems, logs, or wood pieces, or for assessing stems, logs, or wood pieces for a particular end use, includes scanning with short-wave or microwave electromagnetic energy and processing the scan data to produce an image indicating the external shape or dimensions of the stem or log and hidden internal characteristics and their position, and assessing the image. Knots and / or whorls, which are not visible from the exterior and the depth of the clear wood sheath from the surface, may be determined.

The invention relates to a 3D printing composite material for mouth rehabilitation and a preparation and using method of the 3D printing composite material. The 3D printing composite material for mouth rehabilitation is characterized by comprising the following components in parts by weight: 10-40 parts of low-viscosity monomer, 10-40 parts of enhanced monomer or low polymer, 150-200 parts of ceramic powder, 5-20 parts of expansion monomer, 5-15 parts of a dispersing agent, 2-6 parts of a short-wave photoinitiator, 1-3 parts of a long-wave photoinitiator, 1-3 parts of an ultraviolet absorber and 2-5 parts of polymerizable quaternary ammonium salt anti-bacterial monomer. The 3D printing composite material for mouth rehabilitation is small in curing shrinkage, short in curing time and high in anti-bacterial property, and is suitable for manufacturing a dental prosthesis.

The invention discloses a spatial large view field, superwide spectral band and multispectral imaging optical system, which comprises a switching reflector, a main optical off-axis three-reflector system, a medium- and short-wave focus-free relaying optical system and a long-wave focus-free relaying optical system, wherein a radiation light beam of an imaging target enters from the switching reflector, and is divided into light rays in three channels, namely a visible multispectral channel, a short-wave / medium-wave channel and a long-wave infrared channel, by color division sheets after passing through the main optical off-axis three-reflector system; the light ray in the visible multispectral channel is reflected by the first color division sheet, and then full-color multispectral imaging is realized through a five-color device; the light rays in the short-wave / medium-wave channel and the long-wave infrared channel are transmitted / reflected by the second color division sheet, respectively pass through the own focus-free relaying optical systems, and then are focused on a focal surface for imaging after being subdivided by filters. The spatial large view field, superwide spectral band and multispectral imaging optical system has the advantages of large view field, large relative aperture, wide spectral range, high subdivision degree, compact structure, small volume, light weight and the like; and large-range, all-day and high-resolution dynamic and stable detection can be realized.

A write-once optical disk comprises a transparent resin substrate having a concentrically or spirally shaped groove and a land formed thereon, and a recording film formed on the groove and the land of the transparent resin substrate, a recording mark being formed by emission of a short-wavelength laser light beam. In addition, a light reflectivity of the recording mark portion formed by emission of the short wave laser light beam is higher than a light reflectivity obtained before emission of the short wavelength laser light beam, and a depth of the groove is in the range of 50 to 80 nm.

This invention discloses an anti-reflection film of silicon solar cell used in solar cells by depositing a rich silicon SiN film on the positive surface of a silicon chip and a SiN film with ideal match on the rich silicon SiN film, in which, and the film content closing to the Si chip surface is high and the surface pasivation effect is better than the SiN film approaching to the idea match, the surface composition speed is more than one time less than the normal matched SiN film, and the rich Si film is thin and only absorbs 20%-30% short waves with the wavelength about 300nm and does not absorb long-middle lightwaves and other composition approaches to ideal chemical match.

The invention belongs to synthetic anti-forgery ink of anti-counterfeiting materials, which is produced by mixing and specially processing commercial pigments, synthetic resin, vegetable oil, mineral oil, filling materials, additives and anti-counterfeiting materials, wherein the anti-counterfeiting materials include long-wave ultraviolet excitation fluorescence, short-wave ultraviolet excitation fluorescence, sunlight excitation color variable, infra-red excitation luminescence, thermochromism, chemical stain anti-counterfeiting materials, optical variable-hue, magnetism, DNA, invisible barcodes covering, intelligent potential and the like anti-counterfeiting materials. The synthetic anti-forgery ink of the invention is adaptable for various securities, bills, trademarks and the like, which has multiply anti-counterfeiting function. One time printing of the invention can achieve multiple anti-counterfeiting purposes. Further, the invention can satisfy identifying demands of different levels and has high anti-counterfeiting degree, which effectively increases anti-counterfeiting difficulty.

The invention relates to selective diffusion technology for a crystalline silicon solar cell, which comprises high-concentration phosphorous diffusion in a facade electrode grid line area and low-concentration phosphorous diffusion out of the facade electrode grid line area, and comprises the following steps: after a silicon chip is cleaned and made to be velvet, preparing a layer of dense silicon dioxide film on the silicon chip as a diffusion blocking layer, then selectively removing an oxidation film in the electrode grid line area by adopting laser grooving technology and forming a groove with a definite depth, and performing the high-concentration phosphorous diffusion to form heavy doping in the electrode area. The selective emitter solar cell prepared by the technology not only has high short wave efficiency, but also has lower electrode resistance and contact resistance; and compared with the conventional corrosion electrode figures adopting photoetching technology, the technology has the advantages of low equipment cost and high production efficiency, and is applicable to industrialized production of the crystalline silicon solar cell.

The invention relates to a high / intermediate-frequency front-end circuit of a digital short-wave receiver, which mainly comprises a PIN diode electric control attenuator, digital control electric tuning preselected tracking filter groups, a gain control low-noise amplifier, a direct digital frequency synthesizer, a plurality of frequency mixers, an intermediate-frequency amplifier, an amplitude detection and grain control circuit and a preselected controller, wherein a weak signal sensed by an antenna is subjected to tracking frequency selection by the first digital control electric tuning preselected tracking filter group after passing through the PIN diode electric control attenuator and then is subjected to frequency selection by the second digital control electric tuning preselected tracking filter group after being amplified by the gain control low-noise amplifier, the signal after being subjected to frequency selection is subjected to frequency mixing three times with the plurality of frequency mixers by three local oscillators formed by the frequency synthesizer and is transmitted to a demodulator for demodulation after being subjected to multistep intermediate-frequency amplification and gain control processing. The high / intermediate-frequency front-end circuit of the digital short-wave receiver can meet the requirement of high sensitivity, strong anti-interference performance and wide dynamic range for the short-wave receiver, is suitable for a frequency-hopping receiving machine with rapid frequency change and has the effects of low insertion loss, low in-band ripple and high selectivity.

We have defined an automated detection system consisting of a combined visible and Short Wave Infra-Red (SWIR) camera that identifies vehicle identification number and the number of occupants in a given vehicle, as well as the speed of the automobile. This information is processed in conjunction with law enforcement rules to determine whether the particular vehicle driver is in violation to enable the law enforcement personnel to issue traffic violation ticket and mail it to the registered driver's address. Such an automated system could be placed at strategic locations along the stretch of the High Occupancy Vehicle (HOV) or carpool lanes and interconnected with backend computing and decision support system to assist law enforcement personnel in identifying vehicle driver violating the HOV or carpool lane rules and in issuing violation tickets to the registered driver of the particular vehicle.

The invention discloses a short wave / medium wave / long wave infrared detector based on InAs / GaSb class II-type superlattice materials. The detector comprises a GaSb substrate, an epitaxial structure deposited on the GaSb substrate, a passivation layer and a metal electrode, wherein the epitaxial structure sequentially comprises a GaSb buffering layer, an n-type InAs / GaSb superlattice contact layer, a first M-type InAs / GaSb / AlSb / GaSb / InAs superlattice hole blocking layer, a p-type InAs / GaSb superlattice long wave infrared absorbing layer, a first p-type InAs / GaSb superlattice contact layer, a p-type InAs / GaSb superlattice medium wave infrared absorbing layer, a second M-type InAs / GaSb / AlSb / GaSb / InAs superlattice hole blocking layer, a p-type InAs / GaSb superlattice short wave infrared absorbing layer, a second p-type InAs / GaSb superlattice contact layer and a cover layer. The detector is of a pMp-p-pi-M-n heterostructure and has the advantages of being low in crosstalk, low in dark current and high in detection rate.

The invention discloses a fake identification system of bank bills based on spectral image analysis, which uses a device and adopts a method of multispectral analysis to excite the anti-fake characteristics on the standard samples of bank bills so that the anti-fake characteristics, such as paper characteristics of paper, fiber, watermark, printing ink, format, print, writing information and the like, are shown, and finally collects, inputs and establishes a standard image database. The database is edited by a computer language and then application software is generated so as to form the fake identification system of bank bills together with the device. A plurality of main anti-fake characteristics of the identified bank bills, such as the paper, the print, the printing ink, the writing information and the like, can be identified under all different light sources, such as illuminating light sources, main light sources, side light sources, backlight sources, long-wave ultraviolet rays, short-wave ultraviolet rays, anti-face laser, infrared light sources and the like. The system is applicable to the technical field such as the anti-fake identification of the bills circulating on the market and is capable of detecting all anti-fake characteristic points of the bills. Synchronously, a network supervision system is established.

In an optical transmitter comprising a directly modulated laser and a wavelength filter provided on a post-stage of the directly modulated laser, the wavelength filter has a modulated light input port for inputting modulated light output from the directly modulated laser, a filter transmitted light output port for outputting light having a wavelength included in a filter transmission band among the modulated light as filter transmitted light, and a filter cutoff light output port provided separately from the modulated light input port and the filter transmitted light output port and outputting light having a wavelength included in a filter cutoff band among the modulated light as filter cutoff light, and the peak of the filter transmission band is set on a shorter-wave side from the peak of the spectrum of modulated light output from the directly modulated laser.

A system for detecting ice or water within an area of interest having a detection system measuring radiance or reflectance of the area of interest when exposed to shortwave infrared radiation having a wavelength in the range containing a crossover point between the curves representing the absorption of electromagnetic radiation by ice and water. The detection system measures the radiance or reflectance in a first band having a wavelength in a spectral band on a first side of the crossover point and outputting a first band signal, and further measures the radiance or reflectance in a second band having a wavelength in a spectral band on a second opposing side of the same crossover point and outputting a second band signal. A processing unit determines a ratio of the first band signal and the second band signal and compares the ratio to a predetermined critical ratio and outputs a determination signal indicating presence of ice or water.