182results about How to "High temperature sensitivity" patented technology

The present invention relates to a method and a device to monitor and control the Selective Laser Powder Processing. A Selective Laser Powder Processing device comprising a feedback controller to improve the stability of the Selective Laser Powder Processing process is presented. A signal reflecting a geometric quantity of the melt zone is used in the feedback controller to adjust the scanning parameters (e.g. laser power, laser spot size, scanning velocity, . . . ) of the laser beam (4) in order to maintain the geometric quantity of the melt zone at a constant level. The signal reflecting the geometric quantity of the melt zone can also be displayed in order to monitor the Selective Laser Powder Processing process. The present invention allows for the production of three-dimensional objects from powder material and improves the state of the art by compensating variations of the border conditions (e.g. local heat conduction rate) by a feedback control system based on a geometric quantity of the melt zone resulting in e.g. a lower amount of dross material when overhang planes are scanned.

The present invention relates to the use of light-converting, colloidal, doped semiconductor nanocrystals to provide a new generation of high performance, low cost monochromatic and white light sources based on LEDs.

Disclosed is a block copolymer formed by coupling the following components with each other: (a) a copolymer (A) of a polyethylene glycol (PEG) type compound with a biodegradable polymer; and (b) at least one oligomer (B) selected from the group consisting of poly(β-amino ester) and poly(amido amine). A method for preparing the same block copolymer, and a polymeric hydrogel type drug composition comprising the temperature and pH-sensitive block copolymer and a physiologically active substance that can be encapsulated with the block copolymer are also disclosed. The multiblock copolymer is obtained by copolymerization of a pH-sensitive poly(β-amino ester) and / or poly(amido amine) type oligomer, a hydrophilic and temperature-sensitive polyethylene glycol type compound and a hydrophobic and biodegradable polymer. Therefore, the block copolymer can form a polymeric hydrogel structure due to its amphiphilicity resulting from the combination of a hydrophilic group and a hydrophobic group in the copolymer and ionization characteristics depending on pH variations, and thus can be used as a drug carrier for target-directed drug delivery depending on pH variations in the body.

A light source sequentially emits lights generated by at least three light emitting elements each emitting a different primary color to generate an image. Each light emitting element has a duty cycle in a lighting period, which may be an image frame period. A sequence scheme is provided for alternatingly driving different ones of the light emitting elements. The light emitting elements are driven in accordance with the sequence scheme at least two times in the lighting period, while maintaining the duty cycle for each light emitting element. In the sequence scheme, at least one light emitting element having the highest temperature sensitivity of all light emitting elements is driven more times than another one.

A piping is anchored onto the lower faces of a heater chip and temperature sensor chips by using a thermal conductive adhesive. The heater chip and the temperature sensor chips are coated with a molding resin, and thermal resistance up to an element formed inside thereof is made smallest on a lower face side.

The invention relates to the technical field of wallpaper, in particular to temperature sensitive ink and a preparation method, temperature sensitive wallpaper and a preparation method of the wallpaper. The temperature sensitive wallpaper is composed of a base material layer, a densification treatment layer, an ink texture layer, a temperature-sensitive reversible color changing layer and a transparent resin layer which are stacked in sequence, and ink adopted by the temperature-sensitive reversible color changing layer is formed by mixing resin emulsion, reversible temperature-sensed color-changing pigment, a cross-linking agent, a light stabilizer, a dispersing agent, a flatting agent and a defoaming agent; the temperature sensitive wallpaper obtained through printing is good in weather resistance and pattern color developing effect, multiple dynamic change forms exist, the wallpaper can be changed to be colorless from a colored state and can also be changed to be colored from a colorless state, the service time is long, and the damp and mildew proofing effect is good.

This invention relates to low resilience, viscoelastic foams which have slower recovery and improved tear strength, and to a process for the production of these foams. The viscoelastic foams of the invention comprise the reaction product of a polyisocyanate with an isocyanate-reactive component, in the presence of a blowing agent, a surfactant and a catalyst. Suitable isocyanate-reactive components comprise at least about 5% by weight of at least one polyether polyol having about 2 to about 4 reactive hydroxyl groups per molecule, an equivalent weight of about 280 to about 2,000, and which is the alkoxylation product of an organic compound which contains at least two aromatic rings, contains from about 2 to about 4 Zerewitinoff active hydrogen atoms and has an equivalent weight of about 100 to about 575.

An optical fiber based polymer core sensor includes an optical fiber having a core and an end having a cured polymer core affixed to the core of the optical fiber. The cured polymer core extends outward from the end of the optical fiber and has a diameter approximately equal to the core of the optical fiber. Note the cured polymer core can be substantially cylindrical, tapered or geometrically shaped. The optical fiber based polymer core sensor can be used to measure a temperature, measure a strain, measure a distance, measure a refractive index, detect or measure an analyte, detect a toxin, detect a biological agent, monitor a chemical process, or a combination thereof

Provided is a temperature sensing circuit for a display, the display and an operation method thereof. The sensing circuit comprises a temperature sensing module, a reading module and a resetting module. The temperature sensing module can provide a sensor voltage potential according to a sensed temperature. The reading module is used for receiving the above sensor voltage potential, and determines whether to output the sensor voltage potential according to a first control signals. The resetting module is used for receiving a second control signal and determines whether resets the sensor voltage potential to be a low-voltage potential according to the second control signal.

The invention discloses a preparation method of a strawberry-like thermochromic energy storage material, comprising the steps of (1) mixing styrene, divinyl benzene, acrylic acid, glycidyl methacrylate, polyvinylpyrrolidone and paraffin, adding an emulsifier and an initiator, cooling, and centrifuging to obtain pure phase-change microspheres; (2) mixing a leuco body dye, an electronic acceptor compound and a solvent to form a mixture, heating the mixture, mixing well to obtain a solution, adding deionized water, tetraethyl orthosilicate, a silane coupling agent and an emulsifier, adding ammonia water under ultrasound to allow reacting, centrifuging, drying at low temperature to obtain thermochromic silicon capsule particles; (3) mixing the phase-change microspheres and the thermochromic silicon capsule particles to obtain a mixture, adding an emulsifier and a catalyst to allow reacting, centrifuging, and drying to obtain the strawberry-like thermochromic energy storage material. The strawberry-like thermochromic energy storage material has the advantages of high enthalpy, high thermosensitive response speed, irreversible color variation, cyclic repetitive color variation, good property stability and the like, can act as a novel intelligent material, and has a good application prospect in the fields, such as building, energy conservation, environmental protection, apparel, and medical services.

The invention discloses a recoverable flexible temperature sensing cable. A cable core is composed of three conductors and a supporting core. Each conductor comprises a wire and an insulating layer, wherein the wire is located in the middle, and the insulating layer coats the wire. The insulating layers are made of negative temperature coefficient heat sensitive material. The supporting core is composed of three metal supporting plates, and the included angle between every two adjacent metal supporting plates is 120 degrees. The three conductors are longitudinally arranged between every two adjacent metal supporting plates respectively, and the conductors adjoin to every two adjacent metal supporting plates adjacent to the corresponding conductors. A one-side metal and plastic composite belt coats the cable core, the metal layer of the one-side metal and plastic composite belt is arranged inwards, and the plastic layer of the one-side metal and plastic composite belt is arranged outwards. An inner sheath coats the one-side metal and plastic composite belt, an outer sheath coats the inner sheath, and a lubricating layer is arranged between the inner sheath and the outer sheath. The recoverable flexible temperature sensing cable is stable in structure and high in flexibility, and can be safely used in the overload or high temperature environment.

The invention provides a temperature sensor based on a hollow annular waveguide optical fiber. One end of an optical fiber sensing head is connected with a light source through an input single-mode optical fiber, and the other end of the optical fiber sensing head is connected with an optical spectrum analyzer through an output single-mode optical fiber. The optical fiber sensing head is composed of a capillary tube, an optical fiber Mach-Zehnder interferometer packaged in the capillary tube and liquid with a high thermo-optical coefficient. The optical fiber Mach-Zehnder interferometer comprises an input multi-mode optical fiber, the hollow annular waveguide optical fiber and an output multi-mode optical fiber, wherein the input multi-mode optical fiber is fused with the input single-mode optical fiber in an axis alignment mode, the output multi-mode optical fiber is fused with the output single-mode optical fiber in an axis alignment mode, the hollow annular waveguide optical fiber is fused with the input multi-mode optical fiber and the output multi-mode optical fiber in an axis staggering mode, the staggering distance between the optical fiber axes is larger than the wall thickness of the hollow annular waveguide optical fiber, and air holes of the hollow annular waveguide optical fiber are filled with the liquid with the high thermo-optical coefficient. Through the air holes of the hollow annular waveguide optical fiber and two light beams transmitted by the annular waveguide, the temperature can be measured, and the temperature sensor is compact in structure and high in sensitivity.

Biodegradable copolymer hydrogels are provided. The biodegradable copolymer hydrogels have a structure of Formula (I) or Formula (II)A-B—BOX—B-A  Formula (I)B-A-B—(BOX—B-A-B)n-BOX—B-A-B  Formula (II), wherein, A comprises a hydrophilic polyethylene glycol polymer (A); B comprises a hydrophobic polyester polymer (B); BOX is bifunctional group monomer of 2,2′-Bis(2-oxazoline) and used for coupling the blocks A-B or B-A-B; and n is an integer, equal to or greater than 0.

A temperature detection circuit includes a first voltage source circuit to generate a first voltage having a temperature dependence by utilizing a work function difference of gate electrodes of a plurality of field effect transistors, a second voltage source circuit to generate a reference voltage having no temperature dependence by utilizing a work function difference of gate electrodes of a plurality of field effect transistors, a correction circuit configured to correct the reference voltage and output a corrected voltage, and a subtraction amplifier configured to subtract the corrected voltage from the first voltage, amplify a resulting subtracted voltage, and output a resulting amplified voltage as a correction voltage signal to adjust a temperature coefficient of the correction voltage signal.

By incorporating germanium material into thermal sensing diode structures, the sensitivity thereof may be significantly increased. In some illustrative embodiments, the process for incorporating the germanium material may be performed with high compatibility with a process flow for incorporating a silicon / germanium material into P-channel transistors of sophisticated semiconductor devices. Hence, temperature control efficiency may be increased with reduced die area consumption.

The invention relates to a double-cladding SPR temperature sensor, and relates to a liquid-filled D-type hollow core double-cladding optical fiber SPR temperature sensor which belongs to the field of optical communication and optical fiber devices. The liquid-filled D-type hollow core double-cladding optical fiber SPR temperature sensor is based on the extension of an SPR optical fiber temperature sensor, has the advantages of simple principle, high sensitivity, small structure, light weight, simple production process, being flexible and low cost, and is suitable for temperature detection of a variety of environments. According to the liquid-filled D-type hollow core double-cladding optical fiber SPR temperature sensor, the inner wall of a D-type hollow core area (3) of a special D-type hollow core double-cladding optical fiber is coated by a metal film (4), and the area is filled with a high thermal light coefficient liquid material. The thermo-optical effect of the filled liquid material is used. When the external temperature changes, the refractive index of the filled liquid material changes greatly, resulting in large shift and change of the corresponding SPR loss spectrum. High sensitivity temperature measurement is realized.

A multi-wavelength Brillouin fiber laser based optical fiber temperature sensor which is formed according to an optical fiber Brillouin gain effect, an er-doped optical fiber amplifying effect, a multi-level Brillouin scattering temperature effect and a heterodyning beat frequency demodulation principle comprises a narrow line width single frequency laser, an optical branching device, a polarization controller, an opto-isolator, an optical circulator, a single-mode sensing fiber, an er-doped optical fiber amplifier, an er-doped optical fiber being not pumped, a high-speed photoelectric detector and a frequency analyzer. The multi-wavelength Brillouin fiber laser based optical fiber temperature sensor has the advantages of being many in the number of wavelengths, narrow in line width, fixed in wavelength interval and stable in output. The multi-wavelength Brillouin fiber laser based optical fiber temperature sensor achieves heterodyning best frequency demodulating detection of a high-order stokes wave and high-accuracy high-sensitivity temperature measuring with the single-mode optical fiber which provides gain for the fiber laser being served as a temperature sending detect unit.

Biodegradable copolymer hydrogels are provided. The biodegradable copolymer hydrogels have a structure of Formula (I) or Formula (II)A-B—BOX—B-A  Formula (I)B-A-B—(BOX—B-A-B)n-BOX—B-A-B  Formula (II),wherein, A comprises a hydrophilic polyethylene glycol polymer (A); B comprises a hydrophobic polyester polymer (B); BOX is bifunctional group monomer of 2,2′-Bis(2-oxazoline) and used for coupling the blocks A-B or B-A-B; and n is an integer, equal to or greater than 0.

The invention discloses a high-modulus asphalt mixture additive and a preparation method thereof. The additive comprises, by weight, 100 parts of plastic, 10-20 parts of EVA resin, 15-25 parts of butadiene-styrene rubber and / or derivative thereof, 10-20 parts of ethylene tar and 10-20 parts of composite modifier, wherein the composite modifier is composed of a mesoporous molecular sieve coated with epoxy grafted polyethylene wax. The additive has high compatibility with asphalt and a mixture, so that resistance to low-temperature cracking of a high-modulus asphalt mixture is improved remarkably, the additive has excellent resistance to track and water damage, and the mixture is low in blending temperature and high in construction peaceability.

An improved cushioning apparatus having a plurality of individual pockets containing an improved filler material comprising granular viscoelastic foam.

A temperature-sensor circuit includes: a transistor having an emitter that is grounded, a collector, and a base; a first resistor having a first end and a second end, the first end being coupled with the collector; and a second resistor having a third end and a fourth end, the third end being coupled with the second end of the first resistor. A junction joining the first resistor and the second resistor is coupled with the base.

The invention relates to a temperature sensor array structure formed by coupling a tetragonal lattice dielectric post photonic crystal W1.15 waveguide and nine single-hole microcavities, and belongs to the technical field of photonic crystal sensors. According to the method, a tetragonal lattice dielectric post photonic crystal array structure is firstly applied to the design of temperature sensors, the number of the temperature sensors on the same module is increased, high temperature sensitivity is obtained, and accordingly detection accuracy of a temperature sensor array is greatly improved. The nine single-hole microcavities are coupled in the vertical direction of the W1.15 waveguide, and resonance frequencies of the nine microcavities are different. When temperature around the certain microcavity of the photonic crystal temperature sensor array changes differently, the resonant wavelength of the microcavity deviates differently, and harmonic peaks of other microcavities are kept unchanged, namely, the microcavities can achieve the sensing function independently and do not interfere with one another. The photonic crystal sensor array structure has extendibility and can be used for temperature sensing at the same time.

The invention discloses a composite fiber grating sensor and the dual-parameter measurement method of a refractive index and a temperature. A sensor structure comprises a single mode fiber (1) and a single mode fiber core (2). The single mode fiber core (2) is provided with a hybrid grating formed by a long period grating (3) and an inclined grating (4) along a horizontal direction. Incident light(5) is emitted into the hybrid grating, and then emergent light (6) enters into an optical wave measuring system. The wavelength offset of an inclined grating refractive index measurement factor is acquired, and then an actual sensitivity value is obtained through the inversion of a sensitivity coefficient. Then, the actual sensitivity value is used to compensate the wavelength shift caused by arefractive index in the dual-parameter measurement factor of the long period grating, and a measured temperature is acquired, and the dual-parameter measurement of the refractive index and the temperature is realized. Two parameters can be measured simultaneously, the structure is simple, a calculated amount is reduced, and the advantage of the high refractive index sensitivity in a traditional long period grating and the advantage of high temperature sensitivity in the inclined grating are possessed simultaneously.

The invention relates to a temperature and refractive index dual-parameter sensor based on a directional coupler and a long-period fiber grating. The temperature and refractive index dual-parameter sensor belongs to the technical field of optical fiber sensing, and comprises a light source, single-mode optical fibers, a section of double-core optical fiber and a detector, wherein the same fiber core of the double-core optical fiber is aligned and welded with fiber cores of the single-mode optical fibers on both sides; the two fiber cores of the double-core optical fiber are made of the same material and are in a single mode respectively, a distance between the fiber cores is less than 20 micrometers, the two fiber cores satisfy a phase matching condition, the fiber core connecting the single-mode optical fibers on two ends is engraved with the long-period fiber grating, and the fiber core is a light-through fiber core; the two fiber cores can undergo energy coupling to form a directional coupler; and a resonance peak generated by the fiber grating drifts with changes of the external refractive index and temperature, and the change of a resonance peak of the directional coupler is only caused by the external temperature change, thereby achieving simultaneous measurement of the refractive index and temperature. The temperature and refractive index dual-parameter sensor is simple to manufacture, the device is small and easy to integrate, the two-parameter measurement can be simultaneously performed, the sensitivity is high, the temperature self-compensation capability is available, and the application prospect is broad.

The invention discloses a preparation method of a low-melting-point copolyamide hot melt adhesive, which includes the steps of adding binary acid consisting of lactam and a mixture of adipic acid andlong carbon chain binary acid having 10 to 14 carbon atoms, diamine consisting of a mixture of short carbon chain diamine having 6 to 8 carbon atoms and long carbon chain diamine having 10 to 14 carbon atoms, a molecular weight modifier, an antioxidant and water to a kettle; first performing nitrogen replacement; then raising the temperature to 120 DEG C and starting to stir; continuing to raise the temperature to 230 DEG C, keeping the pressure rising continuously, and performing reaction at the pressure of 1.3 MPa to 1.5 MPa and temperature of 230 DEG C to 250 DEG C for 1.5 h; reducing the pressure to atmospheric pressure, adding inorganic filler, performing reaction for another 2 hours, and then pressurizing and discharging a material. The obtained copolyamide hot melt adhesive preparedby the preparation method of the invention has the advantages of low melting point, stability, short opening time, appropriate melt index, good bonding effect, and excellent water washing resistanceand dry cleaning resistance.

The invention provides a harmonic amplitude temperature measurement method for magnetic nanoparticle temperature measurement in a high-frequency excitation magnetic field, and the method comprises thesteps: carrying out the fitting of a harmonic amplitude compensation function through a Fokker-Planck equation and a Langevin equation, and building a harmonic amplitude-temperature model for magnetic nanoparticle temperature measurement in the high-frequency excitation magnetic field; and substituting the harmonic amplitude and the phase information of the magnetic nano sample under the high-frequency excitation magnetic field into the constructed harmonic amplitude-temperature model, and solving the temperature information of the magnetic nano sample. According to the invention, magnetic nano real-time temperature measurement in a high-frequency excitation magnetic field is realized, the problem that a magnetic nano temperature measurement method is only suitable for a low-frequency excitation magnetic field and cannot be applied to a high-frequency magnetic field is solved, and the timeliness and feasibility of magnetic nano particles are improved; the method can be used for solving the problem of low magnetic nano temperature measurement precision under high-frequency magnetic field excitation of high-power integrated devices in the industrial field and thermal therapy in themedical field.

The invention discloses a heat-resisting ceramic-armored high-temperature thermocouple and a manufacturing method thereof. The thermocouple is composed of a junction box, a cover shell, wiring columns, a protection bushing, a sealing tape, an insulation layer, a lead, a thermocouple wire and insulators, wherein the protection bushing is made of alumina high-temperature ceramic, a carbon fiber basket is integrated inside the ceramic body, and one surface, facing the inner part of the protection bushing, of the carbon fiber basket exceeds the insulation layer on the inner surface of the protection bushing; a heat conduction block made of pure titanium is also arranged, the working end is connected with the carbon fiber basket extending end, and the center of the opening end is connected with the lead; silicon carbide-based ceramic fiber is braided to form the lead; the sealing tape is made by adopting a high-temperature adhesive HN-767A; the sealing space formed by the protection bushing, the high-temperature adhesive and the junction box is a protective atmosphere environment; and the thermocouple wire is the nickel-chromium-silicon / nickel-silicon thermocouple wire. The thermocouple of the invention can replace an expensive platinum rhodium thermocouple, and has the advantages of good economics, high reliability and long service life.

The invention discloses an infrared lens with high definition, long focal length and long wave. The infrared lens comprises a front fixed group, a zooming group, a compensating group, a rear fixed group and a detector which are sequentially distributed along an optical axis from the object side to the image side, wherein the front fixed group consists of positive meniscus lenses of which convex surfaces face to the object side; the zooming group consists of biconcave lenses; the compensating group consists of first double convex lenses; the rear fixed group consists of a first negative meniscus lens, a second biconvex lens and a second negative meniscus lens which are sequentially distributed along the incidence direction of light. The infrared lens disclosed by the invention has the advantages that continuous zooming of high zooming ratio (25 to 300mm) can be realized, and a target is found at short focus and is identified at long focus; in addition, the target cannot be lost in the zooming process; the infrared lens can be matched with infrared detectors with high-definition, big area array and long wave and types of 1024*768 and 1280*1280.

The invention discloses a PTC thermosensitive resistor based on a conducting polymer and application of the PTC thermosensitive resistor. The PTC thermosensitive resistor based on the conducting polymer is prepared from polyimide, polyacetylene, phenolic epoxy resin, conductive filler, thermal conducting filler, silicon dioxide, calcium oxide and talcum powder. The PTC thermosensitive resistor based on the conducting polymer has the advantages of being high in temperature sensibility, short in response time, low in residual current and high in stability, has the excellent winding property and fracture resistance, can be widely applied to automatic temperature-control heaters such as a plate-type automatic temperature-control heater, an automatic temperature-control heating band, a tubular automatic temperature-control heater and an automatic temperature-control heating cable which have various shapes and is long in service life.

The invention discloses an optical fiber Fabry-Perot temperature sensing head based on a PDMS arc-shaped reflecting surface and a preparation method of the optical fiber Fabry-Perot temperature sensing head. The sensing head comprises a single-mode optical fiber (1) and a microtube (2) arranged at the tail end of the single-mode optical fiber (1) in a welding manner; the microtube (2) is filled with PDMS (3); the microtube (2) filled with the polymer PDMS (3) forms a Fabry-Perot cavity; and an arc-shaped reflecting surface is formed at the tail end of the polymer PDMS (3). Compared with the prior art, the temperature sensitivity of the sensing head is improved by nearly 7.33 times compared with that of an unconstrained condition; the temperature sensitivity is controlled by controlling the length of the PDMS or the radian of the end face of the PDMS, and the smaller the length of the filled polymer PDMS is, the larger the radian of the arc-shaped end face is, and the higher the temperature sensitivity of the sensing head is; the sensing head has the advantages of being small in size, high in sensitivity, simple in structure, easy to manufacture and the like.