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.

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 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 discloses a method and device for carrying out gas recognition based on a single sensor. The method includes the following steps that: a short-period pulse heating voltage is applied tothe single sensor, the test current of an unknown gas is obtained, and maximum time and a gas sensitive response value sequence are calculated separately; the position of the maximum time in a concentration-maximum time relation curve in a pre-established gas characteristic recognition library is determined according to the maximum time, and the possible types and concentrations of the gas are preliminarily judged; the closed envelope line of the gas sensitive response value sequence in a radar map is matched with a closed envelope line cluster in a radar map in the pre-established gas characteristic recognition library, and the type and concentration of the gas are finally recognized based on preliminary judgment. With the method and device adopted, gas recognition can be realized with the single sensor, which enables simplicity and easiness in operation, and the size of the sensor is greatly reduced; short-period thermal modulation processing is adopted, so that the single sensor isperiodically under a plurality of experimental temperatures, and therefore, a large quantity of experimental data can be rapidly obtained, and working efficiency is further improved.

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.

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).

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.