39 results about "Thermal modulation" patented technology

The invention discloses a silicon-based integrated optical vector-matrix multiplier, which consists of nano-wire micro-ring resonators arranged periodically, and is used for realizing the multiplication of an N*N matrix and an N*1 vector, wherein elements in the N*N matrix and the N*1 vector are all 0 or 1. The optical vector-matrix multiplier is prepared from a silicon-on-insulator material, the basic units of the multiplier are the nano-wire micro-ring resonators (MRR), and the basic structure is the MRRs which are arranged in N*N and are provided with a thermal modulation mechanism respectively. The silicon-based integrated optical vector-matrix multiplier adopts the prior art, so that the device has small volume, low power consumption and good expansibility and is convenient to be integrated with an electrical element; the silicon-based integrated optical vector-matrix multiplier adopts laser pulses to transmit information, so the speed is high and the delay is short; a digital mode is utilized for processing signals, so the defect that an analog optical computing system has low accuracy and poor programmable capacity is avoided; and waveguides with a great refractive index difference are utilized to transmit light, so the problem that the space diversity efficiency of the conventional optical vector-matrix multiplier is low is avoided.

A method to measure the quantity of olefin species in a complex hydrocarbon mixture by means of comprehensive multi-dimensional gas chromatography, involves passing a sample of a hydrocarbon mixture through a first capillary column comprising a dimethyl-polysiloxane stationary phase, subjecting the sample to a thermal modulation before entering a second column comprising a 50% phenyl, equivalent, polysilphenylene-siloxane stationary phase, wherein the introduction bandwidth into the second column is smaller than 20 milliseconds.

An Apparatus and method for two-stage chromatographic separation uses thermal modulation. The chromatographic column or modulation tube (1) has a loop structure such that two portions of modulation tube (1) can be thermally modulated simultaneously by at least one thermal modulation device, which device can have a cold gas source, jet tube (2), and a hot gas source, hot jet tube (5), to modulate the temperature of the portions (3, 4) of modulation tube (1).

A high-power, tunable and narrow linewidth external cavity semiconductor laser belongs to the technical field of a semiconductor laser and aims to solve the problem that the comprehensive requirements such as mode characteristic, beam quality, linewidth, coherence and tunability of a single laser are difficult to be met. The high-power, tunable and narrow linewidth external cavity semiconductor laser is formed by directly coupling a gain chip, a tunable external cavity and an inclined power amplifier with a curved waveguide through an end surface, wherein the gain chip is used for achieving laser output of single-mode wide spectrum; the tunable external cavity adopts a silicon on insulator (SOI) material; the linewidth is narrowed by increasing cavity length and a quality factor Q of a laser resonant cavity; the tunability is achieved by the adoption of refractive index of a thermal modulation material; and by the arrangement of the inclined power amplifier with curved waveguide, laser output with high power and high beam quality is achieved under ensuring the stability of the gain chip and the tunable external cavity. By the high-power, tunable and narrow linewidth external cavity semiconductor laser, a novel semiconductor laser integrating a single mode, high power, high beam quality, narrow linewidth, high coherence, tunable wavelength and the like is achieved, and the high-power, tunable and narrow linewidth external cavity semiconductor laser has important application prospect in the fields such as space laser communication and laser radar.

A thermal modulator device for gas chromatography and associated methods. The thermal modulator device includes a cooling member, an electrically conductive capillary in direct thermal contact with the cooling member, and a power supply electrically coupled to the capillary and operable for controlled resistive heating of the capillary.

The invention discloses a thermal modulation method for an infrared gas image and belongs to the field of gas detection. The method comprises the following steps of: 1, multiplying a brightness mean value of the infrared gas image by a certain proportionality coefficient to serve as a segmentation threshold, segmenting the infrared gas image by using the segmentation threshold, and obtaining a low-brightness interval (0, T) and a high-brightness interval (T, 255); 2, selecting a brightness node, wherein the node is greater than the brightness mean value of the infrared gas image, performing gray stretch on the low-brightness interval (0, T), wherein the low-brightness interval is changed into (0, node), performing gray stretch on the high-brightness interval (T, 255), wherein the high-brightness interval is changed into (node, 255+node), and the gray interval of the image is (0, 255+node); converting the gray space of the image to the interval (0, 255), and obtaining a processed image; and 3, normalizing the gray of the image data of the processed image, performing gamma transform on the normalized image I', and obtaining a final image. The thermal modulation method is suitable for enhancement processing of the infrared gas image.

The invention discloses an adjustable 2*2 light splitter which comprises a substrate, wherein an input waveguide unit, a coupling waveguide unit and an output waveguide unit are arranged on the substrate; the input waveguide unit is connected with the output waveguide unit through the coupling waveguide unit; and the coupling waveguide unit comprises a coupling waveguide component, a thermal modulation component and a thermal insulating component. The light splitter has the beneficial effects that firstly, adjustment of any light splitting ratio can be achieved; secondly, only a primary orientated coupler structure is provided, so that the light splitter is low in consumption, compact in size and easy in integration with other devices; and thirdly, adjustment of different voltages can be achieved through the thermal modulation component, and adjustment on light splitting ratios of different wavelengths is achieved.

The invention discloses a near-infrared thermal modulation zoom super-structure lens based on a phase change material Sb2S3. The near-infrared thermal modulation zoom super-structure lens comprises an elliptical Si nano-column on the bottom layer and an elliptical Sb2S3 nano-column on the upper layer, a filling material SiO2 is deposited on the periphery of the elliptical Si nano-column, and an ITO layer is deposited between the filling material SiO2 and the elliptical Sb2S3 nano-column. According to the invention, the phase-change material Sb2S3 is used for thermally modulating a zoom super-structure lens. In the near-infrared region, a real part refractive index change exists between the amorphous state and the crystalline state of the Sb2S3, and the loss in the two states is very low. By switching the Sb2S3 between the two states, the variable-focal-length double-layer super-structure lens is realized. The maximum full width at half maximum of each focus of the lens is close to the diffraction limit. The focusing efficiency of the two focuses can reach more than 50%. The super-structure lens has the advantages of thermal control, good imaging effect and the like, and has a huge application potential in the fields of multifunctional devices, biomedicine, communication, imaging and the like.

The present invention refers to a “Method for pasty ink flexography printing associated to ink load variation due to thermal modulation” developed to allow a novel printing technology in central drum flexography equipments with high viscosity inks and 100% solids with later UV radiation (UV) or electron beam (EB) curing. The invention provides a central drum flexographic printing system which by means of modifications in the inking systems allows applying high viscosity inks with no intermediate drying or curing system between the successive appliance of several colors having only the final drying with a curing device, preferably based on electron beam or optionally by actinic radiation (UV light).

A modular heat exchanger for battery thermal management having a plurality of similarly constructed heat exchange elements affixed to a cover plate and fluidly coupled with one another via a single external manifold structure that functions as both an inlet manifold and an outlet manifold for each of the heat exchange elements. Rigidity is improved with alternating tabs or overlapping tabs between adjacent elements, and / or side edges between adjacent elements having cutouts for receiving stiffening ribs formed in the cover plate. The external manifold structure provides additional stiffening for the interconnected heat exchange elements.

A system and method for locating a circuit defect, such as a short or an incipient open, in an electric circuit in a workpiece, such a Printed Circuit Board (PCB) or MultiChip Module (MCM). The circuit is connected to a device for sensitively measuring any resistance change. A thermal stimulus is applied to various subsets of the surface of the workpiece, the thermal stimulus being temporally modulated, and the resistance change measurement correlated with this modulation. By applying well-designed thermal stimulus subsets, resistance measurements may be logically combined which correspond to the plural thermal stimulus subsets. Further, the search region where the defect may be located may be iteratively refined. By measuring the time delay between the thermal stimulus and corresponding resistance change, the depth of a defect below the surface of the workpiece is further determined. Thus the system and method efficiently and accurately locates a defect in three dimensions, even if the workpiece is large, and the defect is small and underneath the surface.

A method includes modulating a laser that is coupled to a fiber; modulating the laser with a member selected from the group consisting of low frequency thermal modulation or bias modulation to broaden a laser linewidth, increase an SBS threshold and reduce an IIN; and modulating the laser with a predistorting modulation selected from the group consisting of phase modulation or amplitude modulation, the predistorting modulation being of equal magnitude but opposite phase as that produced in at least one member selected from the group consisting of the laser or the fiber as a result of the low frequency thermal modulation or bias modulation. An apparatus includes a laser; and a fiber coupled to the laser, wherein the laser is i) modulated ii) modulated with a member selected from the group consisting of low frequency thermal modulation or bias modulation to broaden a laser linewidth, increase an SBS threshold and reduce an IIN and iii) modulated with a predistorting modulation selected from the group consisting of phase modulation or amplitude modulation, the predistorting modulation being of equal magnitude but opposite phase as that produced in at least one member selected from the group consisting of the laser or the fiber as a result of the low frequency thermal modulation or bias modulation.

The invention relates to a TEC temperature control structure, and especially relates to a photon chip temperature control structure based on a TEC; the photon chip temperature control structure comprises a temperature control object photon chip, a PCB substrate used for leading out a photon chip thermal adjusting electrode and a heat conductive plate; the heat conductive plate is provided with a heat conductive platform; the photon chip is bonded on the heat conductive platform; the PCB substrate is provided with a through hole; the photon chip extrudes outside the top surface of the PCB substrate, and the photon chip thermal adjusting electrode is led to the PCB substrate; the heat conductive plate bottom is attached to the cold end of a TEC refrigeration piece; the hot end of the TEC refrigeration piece is attached on the top end face of a heat radiation pedestal; a hole is opened on the side wall of the heat conductive plate and positioned right below the heat conductive platform, a NTC temperature sensor is arranged in the hole. The TEC and the photon chip are integrated so as to solve the photon chip thermal modulation temperature drift problems, thus greatly improving the thermal modulation coupling and packing efficiency of the photon chip; the photon chip temperature control structure is small in size, compact in structure, high in efficiency and high in integration level.

The invention discloses a metal oxide gas sensor array and a method for identifying the type and concentration of methanol or ethanol or isopropanol by using the gas sensor array. The sensor array comprises sensors coated with n different nickel oxide sensitive films, the nickel oxide sensitive films are prepared through a solution method, and the types and recognition performance of the metal oxide sensitive films are expanded through doping of different metal ions; Furthermore, thermal modulation resistance response signals of the sensor array to methanol, ethanol or isopropanol with different concentrations and types are tested through variable-temperature thermal modulation, and then normalization processing of thermal modulation sensitivity response signals is carried out; mapping (calibration) between methanol or ethanol or isopropanol with different concentrations and a normalized sensitivity signal is established through a supervised learning algorithm, then types and concentrations of the three alcohols are identified, and the method can be widely applied to quantitative identification and detection of types and concentrations of other volatile organic compounds very easily.

A thermal modulator device for gas chromatography and associated methods. The thermal modulator device includes a recirculating fluid cooling member, an electrically conductive capillary in direct thermal contact with the cooling member, and a power supply electrically coupled to the capillary and operable for controlled resistive heating of the capillary. The capillary can include more than one separate thermally modulated sections.

The invention relates to a gas chromatography detection device, which comprises a sample introduction device, a column oven and a detection device, a first chromatographic column and a second chromatographic column are installed in the column oven, a thermal modulator is arranged on the column oven, and the thermal modulator comprises a shell, a first semiconductor chilling plate and a second semiconductor chilling plate. The first semiconductor chilling plate and the second semiconductor chilling plate are located in the shell and oppositely arranged on the two sides of the shell, the length of the first semiconductor chilling plate and the length of the second semiconductor chilling plate are parallel and equal, a first sliding block and a second sliding block are arranged in the shell, the first sliding block makes contact with the cold end of the first semiconductor chilling plate, the second sliding block makes contact with the hot end of the first semiconductor chilling plate, a first air channel is formed in the first sliding block, a second air channel is formed in the second sliding block, a connecting rod is connected between the first sliding block and the second sliding block, a boss is arranged on the connecting rod, a displacement mechanism is arranged on the heat modulator, and the displacement mechanism drives the boss to slide in the length direction of the through groove.

Improved thermal modulator (2) for gas chromatography comprising: an analytical capillary (4) to be passed through by analytes and intended to be interposed between two gas chromatographic columns (1,3), a cooling system (8) comprising a cold zone (10), a support element (11) associated with said cold zone (10) and configured to support a portion (17) of said analytical capillary (4) so that saidportion (17) is at a substantially corresponding or slightly higher temperature, with respect to that of said cold zone (10), said portion (17) of said analytical capillary (4) which passes through and / or is in contact with said support element (11) thus defining the trapping portion (17) in which the analytes passing through said capillary (4) are intended to be trapped / immobilized, control means (14) which selectively control the sending of pulsed current to electrically conductive elements (70, 71) associated with said analytical capillary (4) so as to heat said trapping portion (17), thuscausing the release / desorption of previously immobilized analytes, means (80) to cause the heating of a portion (81) of said analytical capillary (4) which is positioned outside of said support element (11) and upstream of said portion (17) of said capillary tube which passes through and / or is in contact with said support element (11) so as to generate a rapid expansion of the gas, which is contained in said portion (81), along the direction of development of said analytical capillary (4), thus facilitating the advancement of the analytes released / desorbed towards the outlet of said portion (17).

The invention belongs to the field of integrated circuit design, and particularly relates to a large-scale thermal modulation phase shifter driving method and system, and the method comprises the steps: generating N reference digital PWM signals through employing a high-frequency clock signal, and carrying out the time domain combination of the N reference digital PWM signals independently through employing K N-bit digital control signals, obtaining k digital PWM signals used for correspondingly driving K power tubes; and driving the K thermal modulation phase shifters by the K power tubes. According to the invention, N reference digital PWM signals are firstly generated, and then a plurality of control signals are adopted to carry out time domain combination on the N reference digital PWM signals to obtain a digital PWM signal which is finally used for driving a power tube, so that the power consumption and the area of the whole driving scheme are reduced in a mode of multiplexing the N reference digital PWM signals; and large-scale thermal modulation phase shifter driving with small area, low cost, low power consumption and high efficiency is realized. The method can be used for driving the optical thermal phase shifter.

A thermally modulating inhalable medicament delivery device may deliver an inhalable medicament as an aerosol, vapor, or partial aerosol and partial vapor mixture. The inhalable medicament may be delivered to a target in a subject. Described herein are devices, systems, and methods for delivering an inhalable medicament to a subject.

The invention discloses a rolling wheel type intelligent rail flaw detection method based on optical-electro-mechanical-hydraulic integration. The technical scheme is as follows: when a flaw detection vehicle runs on rails at a certain speed, rolling wheels provided with probes rotate in the direction opposite to the running direction of the flaw detection vehicle at a given speed, three rolling wheels are mounted on each of two sides of the flaw detection vehicle, one probe is mounted on each rolling wheel, the angle formed by the probes on every two rolling wheels is 120 degrees, and the higher detection speed and efficiency can be obtained by the aid of the speed of the rolling wheels relative to the flaw detection vehicle. The probes has photo-thermal modulation and wireless transmission functions, the probes can emit lasers when moving above the rails, the lasers irradiate into the rails to emit heat, and the heat enables flaws (such as blind cracks) in the rails to be closed, so that excited surface wave signals produce obvious peek variation wirelessly transmitted to a control system on the vehicle, and positions and shapes of the flaws of the rails can be further determined.