164results about How to "Good spectral characteristics" patented technology

A method of printing using dry pigments is introduced, wherein a binder material is applied to the surface of an object uniformly or in a pattern, and then dry pigment is applied to the binder material in a pattern or uniformly. The dry pigment sticks to the patterned binder, or the patterned pigment may be bound to the uniform binder, to produce a pattern.

The invention relates to vanadium dioxide-doped powder, vanadium dioxide-doped dispersion, and a preparation method and application thereof. The chemical compositions of the vanadium dioxide-doped powder shown as V1-xMxO2 (x is more than 0 and less than or equal to 0.5, and M is a doped element used for controlling the size and appearance of the vanadium dioxide-doped powder.). The vanadium dioxide-doped powder has uniform grain size and high dispersibility.

A computer-controlled system for producing a multi-color image on a substrate using multi-colored cholesteric liquid crystal (CLC) pigment materials made from CLC flakes tuned to predetermined bands of color. An image generator automatically generates an image specifying a pattern over which binder material is to be applied to a substrate by a binder material applicator. A plurality of CLC pigment applicators automatically apply patterns of different-color CLC pigment material to the pattern of binder material, which binds thereto as the binder material dries according to its drying characteristics. An output device is used to automatically return the substrate to a different one of CLC pigment applicators after each application of a pattern of different-color CLC pigment material to the pattern of binder material. The output device automatically repeats the return of the substrate to the CLC pigment applicators until all bands of color in the multi-color image are rendered.

The object of the invention is to provide a favorable spectral characteristic that reduces variation depending on the frequency of received light intensity, and that is gentle on a subject eye. It also eliminates displacement between positions of respective spectral images of the same part even if a change in alignment occurs between the eye and apparatus with the lapse of time. An apparatus 1 for measuring spectral fundus image data of this invention comprises: an illumination optical system 10 having an illumination light source 11 that emits a light beam in a specified wavelength range; a light receiving optical system 20 for forming a fundus image on the light receiving surface of a photographing section 4; a liquid crystal wavelength tunable filter 32 capable of choosing a wavelength of a transmitted light beam in a specified wavelength range; a spectral characteristic correction filter 13 having wavelength characteristic for correcting the wavelength characteristic of the emitted light intensity of the illumination light source 11 and the transmission wavelength characteristic of the wavelength tunable filter 32 so that the received light intensity on the light receiving surface is kept within the specified range; and a data measuring section 7 for taking the spectral fundus image data from the light receiving surface while changing the wavelength of the light beam passing through the wavelength tunable filter 32.

Textile fibers and other fibrous substrates functionalized with particles are provided for use in the detection of targets of interest by spectroscopic methods. In one embodiment, a substrate is provided that comprises a conformal coating on its surface, wherein the coating comprises a plurality of chemically functional particles that are spectroscopically enhancing. Methods for producing such functionalized textile fibers are also provided. These textiles can be used as platforms for spectroscopic detection, including surface-enhanced Raman scattering (SERS), surface-enhanced infrared absorption (SEIRA), and surface-enhanced fluorescence (SEF). Functionalized textile fibers for use in the signature detection methods are produced by performing layer-by-layer self-assembly of particles on natural and synthetic textile substrates.

The invention provides a direct sequence spread spectrum and despread demodulation method which is mainly applied to the continuous phase modulation in the field of wireless spread spectrum communication. The method comprises the steps of: at a transmitting end, firstly designing a group of spread spectrum sequence, mapping transmitting bits 0 and 1 into two groups of constant envelope baseband complex signals wit continuous changing phases and identical head and end phases, and during modulation, selecting one of the two baseband complex signals to serve as a modulation signal according to transmission information for transmission; at a signal receiving end, accumulating signals corresponding to all chips to the baseband complex signal corresponding to anyone chip in the sequence according to a spread spectrum rule of the spread spectrum sequence to complete the despread treatment of a spread spectrum signal; and comparing phase change directions at the initial position and the end position of the despread complex signal, and judging the transmission information carried by the spread spectrum sequence according to the increase and decrease of the phase change directions, thereby realizing signal demodulation. According to the invention, the continuous phase characteristic and the constant envelope characteristic of the signal are maintained in the direct sequence spread spectrum, and the estimation of carriers and initial phases under low signal to noise ratio are avoided by adopting incoherent despread and demodulation.

The invention discloses a color regulation and control method based on porous alumina and single atom deposition technology, which comprises the following steps of: deducing a calculation formula according to a simulated porous alumina membrane system; calculating by the wavelength corresponding to the regulation and control color to be expected to obtain a template hole depth matched with the wavelength; then, preparing a porous alumina template with the required hole depth by accurately controlling the secondary anode oxidation time in the porous alumina preparing process; and depositing a high-reflectivity nano-membrane layer on the surface of the porous alumina template by utilizing the single atom deposition technology to enable the template to present the expected regulation and control color, thereby realizing the regulation and control on the color of porous alumina. The method disclosed by the invention greatly improves the dichroism of the porous alumina used as a two-dimensional photonic crystal, can be used for preparing porous alumina with different regulation and control colors, and realizes the regulation and control on the colors of the porous alumina. The method is hopeful of playing a great role in micro-device preparation in related instruments such as lasers, integrated optical circuits, optical communication instruments, optical interconnection instruments, optical calculation instruments, optical information processing instruments and the like.

The invention discloses a non-isolated direct-current converter type differential three-level inverter. The circuit structure of the inverter consists of a power supply, an input filter, two bidirectional three-level direct-current converters, an output filter and an alternating current load, wherein the bidirectional three-level direct-current converters are connected in a differential way, i.e. input ends are connected in parallel and output ends are connected in series. By the inverter, the function of converting unstable and low-quality direct-current voltage into stable and high-quality sine alternating-current voltage as required can be realized. A circuit topology family of non-isolated direct-current converter type differential three-level inverters, including Boost type, Buck type, Buck-Boost type, Cuk type, Sepic type and Zeta type, is obtained by changing the type of the bidirectional three-level direct-current converters. The inverter has the characteristics of simple circuit topology, capability of adapting to wider voltage input range, bidirectional power current, single-stage conversion, small volume, light weight, low cost, simple control, high conversion rate, high load adaptability, high dynamic performance and the like, and is applied to a high-voltage input occasion.

The device calculates a first frequency-dependent useful signal level estimator for the frame. The transfer function of a first noise-reducing filter is determined on the basis of the first useful signal level estimator and of a frequency-dependent noise level estimator. A second frequency-dependent useful signal level estimator for the frame is then calculated by combining the spectrum of the input signal and the transfer function of the first noise-reducing filter. The transfer function of a second noise-reducing filter is determined on the basis of the second useful signal level estimator and of the noise level estimator. The latter transfer function is used in a frame filtering operation to produce a signal with reduced noise.

The invention discloses a method and system for identifying an oil spilling target of a ship. The method comprises the following steps of: establishing a conventional oil type actual measurement spectrum database of the ship by use of actual measurement spectrum data of a conventional oil type through an ASD (Analytical Spectral Device) ground spectrometer; synchronously acquiring actual measurement spectrum data and imaging spectrum image data of different oil types by utilizing the ASD ground spectrometer and a vehicle-mounted high-spectrum sensor, acquiring rebuilt spectrum data by utilizing an experimental linear method, and carrying out precision evaluation on the rebuilt spectrum data by utilizing a similar coefficient method and optimizing a rebuilt scheme; and optimizing spectrum characteristics of an oil film according the actual measurement spectrum data and the rebuilt spectrum data, and selecting a spectrum section to carry out spectrum angle map identification. According to the invention, a problem that continuous spectrum data on the same ground can not match because absorption characteristics of multi-waveband images and satellite-mounted high-spectrum images are attenuated due to space scale change is solved, the oil spilling identification precision is improved to more than 85%, and fast identification of the oil spilling target based on a high-spectrum image is realized.

The invention discloses a high frequency isolation type three-level inverter based on a Boost converter. The high frequency isolation type three-level inverter is composed of an input direct-current electrical source unit, an input filter, a high frequency isolation type three-level inversion unit with an energy storage inductor, a high frequency transformer, a cycle converter, an output filter and an output alternating load which are sequentially connected. Power switch tubes are staggered to be connected, three sorts of voltage levels can occur on the input energy storage inductor L, the size of the inductor is decreased, the voltage stress of the power switch tubes is reduced, a filter capacitance value can be reduced, the selecting range of the power switch tubes is widened, and after the assisting side edge of the high frequency transformer passes through the cycle converter and an output filter capacitor, a stable sine alternating voltage is obtained. The high frequency isolation type three-level inverter based on the Boost converter has the advantages that the number of power conversion stages is small, the number of power switching devices is small, the voltage stress of the power switch tubes is low, two-way power flow and high frequency electrical isolation can be realized, and the voltage spectral characteristics at the front end of the output filter are good.

The present invention refers to laser diode array double feedback outer cavity laser. It contains making alignment to laser diode array output light by fast axis, transmitting in two ways in slow axis direction, spherical reflector dispersion element constructed double feed-back outer cavity respectively to proceed spatial filtering and mode selection to this two ways light, said spherical reflector and dispersion element constituting one resonant cavity. The present invention raises laser diode array output laser spectra and spatial character, capable of realizing high power, narrow linewidth, and high-brightness laser output.

The invention discloses a device and a method for measuring the shapes of spaces on the basis of low-reflectivity three-core fiber grating arrays, and belongs to technologies for manufacturing and measuring precision instruments. The device is structurally characterized in that a three-core fiber fan-out device is connected with an optical cable of a low-reflectivity three-core fiber Bragg grating array sensor, the optical cable of the low-reflectivity three-core fiber Bragg grating array sensor comprises a three-core fiber and a protective sleeve, fiber cores of the three-core fiber are uniformly configured, the protective sleeve is configured on the outside of the three-core fiber, and low-reflectivity fiber Bragg grating arrays are written on the three-core fiber. The method for measuring the shapes of the spaces includes measuring spectra by an optical frequency-domain reflectometer OFDR under the effects of a multi-way optical switch to acquire stress and temperature distribution of the low-reflectivity fiber Bragg grating arrays and optical cables of reference fiber Bragg grating arrays; decoupling influence of temperatures; reconstructing information of the shapes of the spaces. The optical cables of the reference fiber Bragg grating arrays are packaged in an outer stress isolation mode. The device and the method have the advantages that the device and the method are high in signal-to-noise ratio and precision and are insensible to environments, and the device can be attached onto the surfaces of measured components to measure the measured components in real time and is long in service life.

A colored photosensitive resin composition comprising an alkali-soluble resin, a photosensitive compound, a curing agent, a solvent and a colorant represented by the formula (I):

The colored photosensitive resin composition can form a color filter array which shows good spectral characteristics.

A computer-based system for producing a multi-color multilayer image on a substrate using multi-colored cholesteric liquid crystal (CLC) pigment materials made from CLC flakes tuned to predetermined bands of color. A computer-controlled image generator automatically generates an image specifying a pattern over which binder material is to be applied to a substrate by a binder material applicator. A plurality of CLC pigment applicators automatically apply patterns of different-color CLC pigment material to a pattern of binder material applied to the substrate, binding thereto as the binder material dries. An output device is used to automatically return the substrate to a different one of CLC pigment applicators after each application of a pattern of different-color CLC pigment material to the pattern of binder material. The output device automatically repeats the return of the substrate to the CLC pigment applicators until all bands of color in the multi-color multilayer image are rendered and the multi-color multilayer image is produced.

The invention discloses a high-frequency isolation type tri-level inverter based on a forward converter. The high-frequency isolation type tri-level inverter based on the forward converter is composed of an input direct-current power supply (Ui), a dividing capacitor, a high-frequency isolation type forward tri-level conversion unit, a frequency converter, an output filter and an output alternating-current load, wherein the input direct-current power supply (Ui), the dividing capacitor, the high-frequency isolation type forward tri-level conversion unit, the frequency converter, the output filter and the output alternating-current load are connected in sequence. The high-frequency isolation type tri-level inverter based on the forward converter has two stages of power conversion (direct current DC--high frequency alternating current HFAC--low frequency alternating current LFAC), and has bidirectional power flow, the front end of the output filter is good in voltage spectral characteristic, and the high-frequency isolation type tri-level inverter based on the forward converter has high power density, can reduce the voltage stress of a switching element, and can achieve high-frequency electrical isolation of alternating current load and direct-current power supply.

The invention discloses an automatic gain control device and a method thereof. The automatic gain control device comprises a simulation VGA, an ADC, a downsampling unit, a digital VGA, a simulation AGC controller, a digital AGC controller and a power calculating unit, wherein the simulation VGA, the ADC, the downsampling unit and the digital VGA are sequentially connected, the simulation AGC controller is connected with the simulation VGA and the digital AGC controller, the digital AGC controller is connected with the digital VGA, and the power calculating unit is connected with the downsampling unit, the simulation AGC controller and the digital AGC controller. The method comprises the steps of downsampling analog-digital conversion output signals, calculating the power average value for downsampled data, calculating the gain coefficient of the simulation VGA in a logarithm domain based on the power average value, using the gain coefficient of the simulation VGA to gain the power average value, and calculating the amplitude gain coefficient based on the gained power average value. The automatic gain control device can reduce downsampling operation amount and signal distortion, widens an automatic gain dynamic range, enables coefficient updating time to be controllable, solves the problem of loop convergence time and is small in resource consumption of hardware.

The invention belongs to the field of organic light emitting devices, and particularly relates to a top-emitting white light organic light emitting device containing two or more light emitting layers. The top-emitting white light organic light emitting device adopting a forward-mounted structure is used as a research object, and a spectrum adjustment layer with hole injection and transmission functions is used as an adjustment object; by selection of a material and control of the material thickness, the top-emitting white light organic light emitting device has a specific optical thickness; by adjustment of the optical thickness of the spectrum adjustment layer and limitation to the light emitting layers and other functional layers, the top-emitting white light organic light emitting device adopting the forward-mounted structure is higher in spectral characteristic and efficiency performance.

The invention relates to a vanadium dioxide doped powder, and a film and a preparation method thereof. The chemical composition of the vanadium dioxide doped powder is V[1-x]M[x]O[2], x is greater than 0 and not greater than 0.5, M is a doped element, and the doped element is Mg or Al, and can be used for improving the optical performances of the vanadium dioxide doped powder and adjusting the phase transition temperature of the vanadium dioxide doped powder.

The invention provides an implantable axial-flow type blood pump temperature detection system and method based on fiber bragg gratings. The system comprises a blood pump, the fiber bragg gratings (8), a motor controller (10), a demodulator (14) and a computer (13), wherein the fiber bragg grating (8) is pasted to an axial blood pump flow passage (7); the motor controller (10) and the demodulator (14) are connected with the leading-out ends of the fiber bragg gratings (8); the computer (13) is connected with the demodulator (14) through a data line. The method comprises the steps that the fiber bragg gratings are laid on a brushless motor stator; the fiber bragg gratings are laid in the implantable axial-flow type artificial heart pump; optical fibers are led out of the human body and connected with the demodulator. The implantable axial-flow type blood pump temperature detection system detects the temperature of the implantable axial-flow type blood pump through the fiber bragg gratings, and the compatibility problem caused by introduction of a sensor cannot occur while temperature detection is achieved, so that intelligent detection and control are realized, power consumption of the blood pump is reduced, and the problems existing in implantation of the blood pump are reduced.

The invention discloses a high-power broadband ultra-flat microwave frequency comb generating device and a method thereof, the generating device comprises a tunable laser source, an optical coupler, aphotodetector, a radio frequency spectrum analyzer, a radio frequency signal source, a cascaded first Mach-Zehnder modulator and a cascaded second Mach-Zehnder modulator, a band pass filter and an optical amplifier, the radio frequency signal source providing a driving voltage to the cascaded first Mach-Zehnder modulator and the cascaded second Mach-Zehnder modulator. The invention has the advantages of wide band range, high power level, good flatness and the like, and the generated microwave frequency comb has good spectrum characteristics, has advantages in spectrum bandwidth and flatness,and can be used in high-speed wireless communication and satellite transponder system. The invention is based on the optical loop of the cascaded MZM modulator, and only needs to change the RF drivingsignal RF so as to obtain the microwave frequency comb with different spacing, and the structure is very simple.