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69results about How to "Temperature insensitive" patented technology
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Method and apparatus for forming silicon containing films
InactiveUS20030124818A1Lower activation energyDecomposes faster and more efficientlyFrom solid stateSemiconductor/solid-state device manufacturingElectrical resistance and conductanceActivation energy
The present invention describes a method and apparatus for forming a uniform silicon containing film in a single wafer reactor. According to the present invention, a silicon containing film is deposited in a resistively heated single wafer chamber utilizing a process gas having a silicon source gas and which provides an activation energy less than 0.5 eV at a temperature between 750° C.-550° C.
Owner:APPLIED MATERIALS INC
Two-piece container seal and method of manufacture
InactiveUS20070007229A1Simple to manufactureImproved separation mechanismCapsSealingEngineeringMechanical engineering
An improved two-piece container seal suitable for sealing a container having a removable closure and for lining the closure comprises a flexible sealant sheet and a flexible liner sheet bonded thereto. The sealant sheet and liner sheet are of the same size and shape. The sealant sheet has a sealing surface and a first thermoplastic surface, and the liner sheet has an outer surface and a second thermoplastic surface. The first and second thermoplastic surfaces are in opposed, congruent contact with each other, and the first thermoplastic surface is ultrasonically welded to the second thermoplastic surface by an array of spaced, frangible ultrasonic welds, forming an adhesive-free interface therebetween. A method of manufacturing a two-piece container seal and a sealed container comprising a two-piece container seal are also described.
Owner:TEKNI PLEX
Two-piece container seal and method of manufacture
InactiveUS7648764B2Easy to manufactureImproved separation mechanismCapsSealingFree interfaceEngineering
An improved two-piece container seal suitable for sealing a container having a removable closure and for lining the closure comprises a flexible sealant sheet and a flexible liner sheet bonded thereto. The sealant sheet and liner sheet are of the same size and shape. The sealant sheet has a sealing surface and a first thermoplastic surface, and the liner sheet has an outer surface and a second thermoplastic surface. The first and second thermoplastic surfaces are in opposed, congruent contact with each other, and the first thermoplastic surface is ultrasonically welded to the second thermoplastic surface by an array of spaced, frangible ultrasonic welds, forming an adhesive-free interface therebetween. A method of manufacturing a two-piece container seal and a sealed container comprising a two-piece container seal are also described.
Owner:TEKNI PLEX
Asphalt-rubber compositions and systems and methods for preparing same
ActiveUS8808445B2Temperature insensitiveEasily applied to road surfaceBituminous material adhesivesBuilding insulationsEngineeringCrumb rubber
Owner:COE WILLIAM B
Fiber grating vibrating sensor with temperature insensitivity, tunable damping and high precision
InactiveCN103471702AReduce vibrationHigh measurement accuracySubsonic/sonic/ultrasonic wave measurementUsing wave/particle radiation meansFiberCantilevered beam
The invention discloses a fiber grating vibrating sensor with temperature insensitivity, tunable damping and high precision. The fiber grating vibrating sensor comprises a cantilever beam. A permanent magnet is connected at the end portion of the cantilever beam. The upper side and the lower side of the permanent magnet are respectively provided with a sealing coil, wherein the sealing coils are the same in diameter and number of wire turns. The upper surface and the lower surface of the cantilever beam are respectively provided with a sensing grating, wherein the sensing gratings are symmetric. The sensing gratings are led out through transmission optical fibers. The gratings are stuck to the upper side and the lower side of the central axis of the cantilever beam with the constant strength respectively. Due to the fact that the cantilever beam can be stretched or compressed by vibration, the central wavelengths of the two sensing gratings can drift in the negative direction, the measurement of vibration acceleration can be achieved by demodulating the changes of the central wavelengths of the two sensing gratings, the signal measurement accuracy can be effectively improved by the adoption of the double-grating structure, the influences, caused by temperature changes, on the measurement result are eliminated, and the sensor has the temperature insensitivity.
Owner:马宾
Asphalt-rubber compositions and systems and methods for preparing same
ActiveUS20100168274A1Temperature insensitiveEasily applied to road surfaceBituminous material adhesivesBuilding insulationsEngineeringCrumb rubber
One embodiment provides a process for preparing an asphalt-coated crumb rubber composition that meets the specification set forth in ASTM D80-02 or deviations thereof which may be established by the specifying agency from time to time. The process generally comprises obtaining asphalt of different penetration grades, combining the asphalt of each grade with preselected chemicals to form separate premixed components, blending the premixed components together under predetermined conditions to form, upon curing, an asphalt-coated crumb rubber composition that meets certain physical requirements for asphalt-rubber binder (ARB), such as those set forth in ASTM D8-02. Advantageously, the resulting asphalt-coated crumb rubber composition not only meets the physical requirements of ARB used in road paving but also has improved dispersion of the rubber, such as dispersion of the rubber in an oil-in-water emulsion of an asphalt.
Owner:COE WILLIAM B
Force sensor for sensing surgical operating force
The invention provides a force sensor for sensing surgical operating force. The force sensor comprises a sensing element and a contact probe. The sensing element is composed of a flexible beam, an upper vertical beam, a lower vertical beam, an upper base and a lower base. Semiconductor strain gages are arranged on the flexible beam, wherein the number of the semiconductor strain gages is 4N, and N is an integer larger than or equal to 1. The semiconductor strain gages constitute N groups of Wheatstone full bridge converters. The upper vertical beam and the lower vertical beam have the force transmission function and the supporting function. The upper surface of the contact probe is fixed to the lower base of the sensing element. The force sensor has the advantages of being high in flexibility, low in cost and small in size, can be integrated with the operation ends of various surgical operating instruments and achieves the function of sensing multi-dimension surgical operating force (including axial force, lateral force, twisting force and the like). The force sensor can be widely applied to the fields of surgery real-time force feedback, rotor assisted surgery, surgery simulation and training, rehabilitation training and the like.
Owner:SHANGHAI JIAO TONG UNIV
Single-mask fabrication process for linear and angular piezoresistive accelerometers
ActiveUS20070084041A1Reduce complexityLow costWave amplification devicesSolid-state devicesEngineeringPiezoresistive accelerometer
An accelerometer and a method of fabricating an integrated accelerometer comprises the steps of providing an SOI wafer with a selected resistivity to eliminate any need for additional doping of the SOI wafer, providing a single mask on the SOI wafer, and simultaneously defining all components of the accelerometer in the SOI wafer without using any pn-junctions to define any piezoresistive components and to provide the same resistivity of all components. The step of simultaneously defining all components of the accelerometer in the SOI wafer comprises defining all components of a linear or angular accelerometer.
Owner:RGT UNIV OF CALIFORNIA
Beet pectin and extraction method thereof
The invention relates to a beet pectin and an extraction method thereof, and concretely relates to a beet pectin with good emulsibility, good emulsification stability and excellent yield stress, and an extraction method thereof. An acid extraction-cooling-pH adjustment-alcohol precipitation technology adopted by the extraction method further improves the emulsion turbidity, the purity and the yield stress of the obtained beet pectin. The beet pectin is especially suitable being used in stabilizers and emulsifiers in the food industry in order to improve the economic benefit of the sugar industry, and provides a good approach for further comprehensive utilization of wastes.
Owner:COFCO NUTRITION & HEALTH RES INST +2
Polyurea type polyurethane coating, raw material composition and use of polyurea type polyurethane coating
ActiveCN108239255AShorten drying timeGood mechanical propertiesPolyurea/polyurethane coatingsOrganic solventPolyol
The invention discloses a polyurea type polyurethane coating, a raw material composition and use of the polyurea type polyurethane coating. The raw material composition of the polyurea type polyurethane coating contains a prepolymer and polyol and does not contain organic solvent, and the mass ratio of prepolymer to polyol is 1 to (0.8-2). A coating prepared from the raw material composition is relatively short in surface drying time, has very good mechanical property, does not contain organic solvent and is environmentally friendly, convenient to use and relatively suitable for being used asa manual patching material.
Owner:SHANGHAI DONGDA CHEM
Method for making near infrared band three-dimensional photon crystal
ActiveCN101393303ALow costEasy to introduce areaPhotosensitive material processingOptical light guidesRefractive indexAcid washing
The invention discloses a method for manufacturing a near infrared waveband three-dimensional photonic crystal, wherein an one-dimensional crystal mask is formed by utilization of holographic interference, and is transferred onto a SiO2 layer on a silicon substrate material through ion beam etching or reactive ion beam etching; high refractive index materials are filled into an etched groove; the surface is polished by the ion beam etching method, and then SiO2 is deposited; a second layer is formed after coating of photoresist, holographic photoetching, ion beam etching and so on; the steps are repeated, and layers are aligned by the Moire fringe technique; and finally the SiO2 is removed by the acid washing method, and the three-dimensional photonic crystal required is obtained. The method fully utilizes the submicron resolution of holographic photoetching, can manufacture the large-area three-dimensional photonic crystal which can then be cut into small blocks as required, has the advantages of high efficiency and low cost, and simultaneously is convenient to overcome the defects of introduction of large area and periodicity by changing wave fronts of two beams of coherent light in an interference field.
Owner:SUZHOU UNIV
Anatase type TiO2 nano particle based pH sensor and pH value detection method
ActiveCN103675061AEasy accessImprove performanceMaterial electrochemical variablesIndium tin oxideRoom temperature
The invention discloses an anatase type TiO2 nano particle based pH sensor and a pH value detection method. TiO2 nano particles are ultrasonically dispersed in a water phase, dispensed on the surface of ITO (indium tin oxide) conductive glass and dried at the room temperature, and a formed uniform film forms a sensitive element of the pH sensor. On the basis of an electrochemiluminescence technology, the ITO conductive glass modified by the TiO2 nano particles is taken as a working electrode, a three-electrode system is adopted, and an integral pH sensor is obtained. An electrochemiluminescence peak potential of the working electrode shifts negatively with the rising of the pH value, so that the pH value of a solution is detected according to the principle. The pH sensor displays stable and repeatable detection signals, and the application range can cover eight pH units. Further, urease is modified above the TiO2 modification area on the ITO glass, a biological sensing application model of the pH sensor is obtained, and the pH sensor can be applied to concentration monitoring of active substances in a biology system.
Owner:THE SECOND HOSPITAL OF NANJING
Sensitive element of three-dimensional micro force sensor based on flexible mechanism
Owner:南通重矿金属新材料有限公司
A temperature insensitive laser
ActiveCN105938975ATemperature insensitiveLaser detailsLaser optical resonator constructionSemiconductor packageWaveguide
The invention relates to a temperature insensitive semiconductor laser (100), comprising: a gain region (101) for generating laser radiation; a reflector region (103) for reflecting the laser radiation generated in the gain region (101), and a waveguide (105) for guiding the laser radiation generated in the gain region (101) to the reflector region (103) and for guiding the laser radiation reflected in the reflector region (103) to the gain region (101), wherein the gain region (101), the reflector region (103) and the waveguide (105) define a resonating cavity of the semiconductor laser (100) and wherein the waveguide (105) is substantially athermal.
Owner:HUAWEI TECH CO LTD
Online light fluid FP cavity based on suspended core fibers
InactiveCN108761649AReduce processing costsQuick responseCoupling light guidesLighter fuelUltimate tensile strength
The present invention relates to an online light fluid FP (Fabry-Perot) cavity based on suspended core fibers. The online light fluid FP cavity is formed by a quartz capillary (2), a single mode fiber(1) welded at the left end of the quartz capillary (2) and a suspended core fiber (3) welded at the right end of the quartz capillary (2). The shaft axes of the single mode fiber (1), the quartz capillary (2) and the suspended core fiber (3) are coincide. The online light fluid FP cavity is simple in manufacturing process, low in cost, high in contrast, fast in response, good in mechanical strength, not sensitive in temperature, resistant to high temperature, etc.
Owner:SHANXI UNIV
Method for encapsulating CaO-Y2O3-Al2O3-SiO2 glass at port of SiCf/SiC core cladding tube
ActiveCN110903102AImprove securityReduce reactivityFuel elementsNuclear energy generationThermal dilatationNuclear radiation
The invention relates to a method for encapsulating CaO-Y2O3-Al2O3-SiO2 glass at a port of a SiCf / SiC core cladding tube. Part of raw materials which are low in reaction activity and low in nuclear irradiation decay rate and have no side effects on the nuclear reaction process are selected, and a glass brazing filler metal is prepared through a melting-water cooling method; by means of the SiCf / SiC matched thermal expansion coefficient, good wettability and low high-temperature viscosity, packaging / connection of the SiCf / SiC composite core cladding tube is achieved under the conditions that the temperature is lower than the applicable temperature (<=1450 DEG C) of domestic third-generation SiC fibers and no pressure exists. The SiCf / SiC core cladding tube is promoted to be applied to a nuclear reactor, nuclear radiation leakage accidents are prevented in advance, and the operation safety of the nuclear reactor is improved. The method has the beneficial effects that the raw materials selected by an encapsulating agent are low-activity elements, the nuclear radiation decay of the encapsulating agent is small, the encapsulating agent has no side effect on a nuclear reaction process, and the mechanical and airtight requirements of port encapsulation of the core cladding tube are met, so that nuclear radiation leakage in the cladding tube can be effectively prevented in a harsh service environment, and nuclear radiation leakage accidents are prevented in advance.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Sliding guide and arm support provided with such a sliding guide
ActiveUS8534733B2Raise spring pressureEasily adaptRotary combination bearingsLinear bearingsFastenerEngineering
A sliding guide, for instance for an arm support (A), comprising at least a first and an at least second profile, with bearing and friction elements included therebetween for providing a particular frictional resistance between the profiles, wherein the profiles are provided with fastening elements, wherein the first and second profiles on both sides in the longitudinal direction are provided with respective connecting longitudinal edges, which cooperate in order to allow sliding of the second profile relative to the first profile, wherein the bearing and the friction elements are provided between the profiles near the respective connecting longitudinal edges thereof in order to provide an internal space (I) between the at least first and the at least second profile. The invention further relates to an arm support (A) provided with such a sliding guide.
Owner:THOMAS REGOUT INT
Integrated switched reluctance machine flywheel energy storage device
InactiveCN101860114AReduce noiseReduce frictionMechanical energy handlingPower inverterManufacturing technology
The invention relates to an integrated switched reluctance machine flywheel energy storage device, belonging to the technical field of the design and preparation of the electric motor. The flywheel energy storage device comprises a switched reluctance machine and a bidirectional power inverter connected with the output end of the electric motor, wherein the outside of the switched reluctance machine is provided with a vacuum shell, the inside of the shell is provided with a stator, a rotor, an upper magnetic suspension bearing and lower magnetic suspension bearing used for supporting the rotor; the switched reluctance machine has an external rotor structure, the rotor is also used as the flywheel, a rotary inner bushing is fixed between the rotor and the stator, and a rotary outer bushing is fixed between the rotor and the vacuum shell. The device of the invention cancels the intermediate transmission unit through which the traditional flywheel is connected with the electric motor in the coupling manner and the like, thus reducing the noise and friction of the system and increasing the efficiency and reliability of the system.
Owner:TIANJIN UNIV
Polycarboxylate water reducing agent and preparation method thereof
The invention discloses a polycarboxylate water reducing agent and a preparation method thereof. The water reducing agent is prepared from the following main components in parts by weight: methyl allyl polyethenoxy ether, sodium methallyl sulfonate, maleic anhydride, acrylamide, propenoic acid, hydrogen peroxide, mercaptoacetic acid and purified water. The polycarboxylate water reducing agent has the advantages that the water reducing rate reaches up to 45%, the high water reducing and slump loss resisting requirements of concrete can be better met, the sensitivity to temperature is low, the adaptability to cement is strong, the preparation process is simple, and the preparation is easy.
Owner:贵州省瓮安新源新材料有限公司
Optical-fiber polarimetric sensor
InactiveUS6118539AEasy to assembleTemperature insensitiveUsing optical meansLight polarisation measurementFiberLight beam
An optical-fiber polarimetric sensor for measuring the displacement of an object relative to a frame, the sensor comprising a measurement optical fiber secured, over a fraction of its length, both to a central point of the object and to first and second fixed points of the frame, means disposed at one end of the measurement fiber and serving to emit a light beam of determined polarization into said measurement fiber, means for exerting twist on the measurement fiber so as to modify the polarization of the light beam, and means disposed at another end of the measurement fiber and serving firstly to detect the resulting light beam and secondly to determine the displacement of the object by analyzing the polarization modified in this way, wherein said measurement fiber is stripped, over said fraction of its length, of the covering that imparts mechanical strength thereto, and it is slid into a deformable guide sheath fixed both to the rotary object and also to the frame. Preferably, the deformable guide sheath is made of fine steel, and it may lined with a flexible protective sheath.
Owner:SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A
Single-mask fabrication process for linear and angular piezoresistive accelerometers
ActiveUS7939355B2Reduce complexityLow costWave amplification devicesSolid-state devicesPiezoresistive accelerometerEngineering
An accelerometer and a method of fabricating an integrated accelerometer comprises the steps of providing an SOI wafer with a selected resistivity to eliminate any need for additional doping of the SOI wafer, providing a single mask on the SOI wafer, and simultaneously defining all components of the accelerometer in the SOI wafer without using any pn-junctions to define any piezoresistive components and to provide the same resistivity of all components. The step of simultaneously defining all components of the accelerometer in the SOI wafer comprises defining all components of a linear or angular accelerometer.
Owner:RGT UNIV OF CALIFORNIA
Vibration measurement apparatus based on coreless fiber
InactiveCN106248194ATemperature insensitiveSignificant effect of light transmission fieldSubsonic/sonic/ultrasonic wave measurementUsing wave/particle radiation meansFiberData acquisition
The invention discloses a vibration measurement device based on a coreless optical fiber, which includes a data acquisition module, a photoelectric detector, a coupler, an erbium-doped optical fiber, a wavelength division multiplexer, a light source, an isolator and a coreless optical fiber sensing structure; The first end of the multiplexer is connected to the light source, the second end of the wavelength division multiplexer is connected to one end of the erbium-doped fiber, the other end of the erbium-doped fiber is connected to the first end of the coupler, and the second end of the coupler is connected to One end of the coreless fiber sensing structure, the other end of the coreless fiber sensing structure is connected to one end of the isolator, the other end of the isolator is connected to the third end of the wavelength division multiplexer, and the third end of the coupler is connected to The input end of the photodetector, the input end of the data acquisition module is connected to the output end of the photodetector. The invention can overcome the influence of temperature on the vibration measurement and improve the measurement accuracy.
Owner:HUAZHONG UNIV OF SCI & TECH
FBG (fiber bragg grating) based pressure sensor and application thereof
ActiveCN104359598ATemperature insensitiveOptional sensitivityForce measurement by measuring optical property variationGratingFiber Bragg grating
The invention discloses an FBG (fiber bragg grating) based pressure sensor and application thereof, and belongs to the technical field of optical fiber sensing. A support optical fiber and an optical fiber with an FBG-FP (Fabry-Perot) structure are parallelly clamped between two metal plates; the two metal plates completely cover two FBGs of the optical fiber with the FBG-FP structure to serve as a Fabry-Perot structure section of a reflection surface, and two ends of the optical fiber with the FBG-FP structure are arranged on the outer sides of the two metal plates respectively; the opposite surfaces of the two metal plates are smooth planes. The optical fiber with the FBG-FP structure serves as a measuring element, pressure applied to the outsides of the metal plates is transmitted to the measuring optical fiber through the metal plates, and the two ends of the optical fiber, with the FBG-FP structure, on the outer sides of the two metal plates can serve as signal connection ports of a corresponding detection instrument. By applying the pressure sensor for measuring, accurate dual-wavelength laser and microwave signals generated by a resonator laser can be respectively measured conveniently.
Owner:江苏西贝电子网络有限公司
Electrical device for detecting moisture
InactiveUS20120126838A1Easy to implementTemperature insensitiveResistance/reactance/impedenceMaterial analysis by electric/magnetic meansEngineeringMoisture
An electrical device for detecting moisture has a detection cable (10a, 10b, 10c) made up of a first element (1) and of a second element (2a, 2b, 2c) which elements are elongate and electrically conducting and separated by a polymer-based material (3), and an electrical resistance measurement appliance intended to measure the electrical resistance between the first and second elements of the the cable, where the material (3) is a non-soluble and moisture-sensitive material.
Owner:NEXANS
Three-dimensional gallium nitride-based exhalation type gas sensor and preparation method thereof
ActiveCN111063725AHigh selectivityImprove performanceTelevision system detailsPiezoelectric/electrostriction/magnetostriction machinesThin membraneGraphite
The invention relates to a three-dimensional gallium nitride-based exhalation type gas sensor and a preparation method thereof, and belongs to the technical field of gas sensors. A two-dimensional unintentionally doped and n-type GaN thin film is formed on a sapphire substrate in an epitaxial mode, then a Ni / SiO2 hexagonal mask plate is prepared, a high-quality Nano p-i-n structure grows on the mask plate in an epitaxial mode, and a novel Nano p-i-n diode is formed; and the Nano p-i-n structure and a PDMS / graphene transfer electrode technology are combined to prepare the gas sensor with high sensitivity and high selectivity. The GaN-based device adopted by the invention is relatively insensitive to temperature, relatively stable in device performance, good in biocompatibility and environmental friendliness, simple and easy to operate in detection process, high in result repeatability and low in equipment maintenance cost.
Owner:TAIYUAN UNIV OF TECH
Premixed polyether for ocean buoys, polyurethane raw material composition, polyurethane foam and preparation method of polyurethane foam
ActiveCN110746564AReduce weightImprove waterproof performanceWaterborne vesselsBuoysPolyesterPolymer science
The invention relates to premixed polyether for ocean buoys. In terms of parts by weight, the premixed polyether for ocean buoys is prepared from the following raw material components: 45-55 parts offirst polyether polyol, 25-35 parts of second polyether polyol, 15-25 parts of polyester polyol, 2-3 parts of a foam stabilizer, 1.5-3.0 parts of a catalyst, 1.5-1.7 parts of a chemical foaming agentand 19-21 parts of a physical foaming agent, wherein the first polyether polyol is polyether polyol which has a hydroxyl value of 465-515 mg KOH / g and a viscosity of 23,000-17,000 mPa.s at 25 DEG C, the second polyether polyol is polyether polyol which has a hydroxyl value of 415-435 mg KOH / g and a viscosity of 4800-6200 mPa.s at 25 DEG C, and the polyester polyol is polyester polyol which has a hydroxyl value of 170-180 mg KOH / g and a viscosity of 8000-13000 mPa.s at 25 DEG C. The invention also relates to a polyurethane raw material composition including the premixed polyether, polyurethanefoam and a preparation method of the polyurethane foam. The polyurethane foam has a long service life, low water absorption, high compressive strength, high corrosion resistance, high aging resistanceand other excellent properties, and can be applied to manufacture of ocean buoys.
Owner:SHANGHAI DONGDA POLYURETHANE
A communication band 1.5 micron laser wavelength standard generation method and device
ActiveCN107370016BGuaranteed accuracyImprove anti-interference abilityLaser detailsSemiconductor amplifier structureMicrometerLasing wavelength
The invention provides a communication waveband 1.5 micrometer laser wavelength standard generating method which comprises the steps of (1), making laser which is transmitted from a laser diode with a reflection reducing coating penetrate through an RF excited rubidium atom 5P-4D excitation state 1529nm optical filter, thereby performing selection on the frequency of the laser; (2), performing feedback of the laser after selection to the laser diode; and (3), outputting a laser wavelength standard which forms laser at a 5P-4D transition wavelength that corresponds with rubidium atom filtering. According to the method of the invention, the laser diode with the reflection reducing coating, the RF excited rubidium atom 5P-4D excitation state 1529nm optical filter and a laser chamber mirror are used for performing feedback, and a communication waveband 1.5 micrometer laser wavelength standard is realized. The communication waveband 1.5 micrometer laser wavelength standard has long-term stability and high accuracy and is a novel long-term stable 1.5 micrometer laser wavelength standard in the optical communication field.
Owner:PEKING UNIV
Isolation amplifier
ActiveCN112019173AHigh bandwidthSimple structureAmplifier modifications to reduce temperature/voltage variationSoftware engineeringHemt circuits
The invention provides an isolation amplifier which comprises a sending end, an isolation layer and a receiving end. The sending end is connected with the isolation layer and is used for amplifying the input signal of the isolation amplifier, modulating the amplified input signal of the isolation amplifier by adopting a closed-loop circuit, generating a modulation signal and sending the modulationsignal to the isolation layer; one end of the isolation layer is connected with the sending end, the other end is connected with the receiving end, and the isolation layer is used as a unique signaltransmission channel between the sending end and the receiving end to transmit modulation signals to the receiving end; the receiving end is connected with the isolation layer and is used for demodulating and amplifying the modulation signal and outputting an amplified signal; and the duty ratio of the modulation signal is in linear relation with the amplified input signal of the isolation amplifier. According to the invention, modulation is carried out by using a closed-loop method, errors are effectively suppressed, and the performance is improved. And meanwhile, the modulation circuit and the demodulation circuit adopt almost the same structure, so that the precision can be improved more effectively.
Owner:SHANGHAI CHIPANALOG MICROELECTRONICS LTD
Carbon dioxide sensor for monitoring microbial growth and preparation method thereof
The invention discloses a carbon dioxide sensor for monitoring microbial growth and a preparation method thereof, and belongs to the technical field of carbon dioxide sensors and preparation methods thereof. The technical problem to be solved is to provide an improvement of a carbon dioxide sensor hardware structure for monitoring microbial growth. According to the technical scheme, an n-type gallium nitride layer is grown on a sapphire substrate in an epitaxial mode, a Ti / Al / Pt / Au electrode is deposited on a gallium nitride epitaxial wafer through a series of electrode preparation processes, and then a BP-PEI layer is prepared through liquid phase stripping of black phosphorus and functional modification of the black phosphorus, so that the miniaturized carbon dioxide gas sensor which is high in sensitivity and can be operated in real time is obtained. The carbon dioxide sensor is stable in performance, good in carbon dioxide gas-sensitive performance, low in price, small in size and simple in detection mode, and has the advantages of being disposable, free of pollution and the like. The carbon dioxide sensor is applied to monitoring of microbial growth.
Owner:TAIYUAN UNIV OF TECH
HiBi-FLM (High Birefringence Fiber Loop Mirror) temperature sensor and device based on PCF-LPG (Photonic Crystal Fiber-Long Period Grating) differential demodulation
InactiveCN102012280AHigh sensitivityTemperature insensitiveThermometers using physical/chemical changesCoupling light guidesGratingSpectrometer
The invention relates to HiBi-FLM (High Birefringence Fiber Loop Mirror) temperature sensor based on PCF-LPG (Photonic Crystal Fiber-Long Period Grating) differential demodulation. Two ports at one side of a 3dB coupler are respectively and optically connected with a broadband light source and one end of a PCF-LPG. The two ports at the other side of the 3dB coupler are respectively and optically connected with one end of a panda polarization maintaining fiber and one end of a polarization controller. The other end of the panda polarization maintaining fiber is optically connected with the other end of the polarization controller. The other end of the PCF-LPG is optically connected with the input end of a spectrometer. The two output ends of the spectrometer are respectively and optically connected with one ends of two optical filters, wherein the two optical filters are the same in bandwidth and different in central wavelength. The central wavelength of one optical filter is within the negative linear region of a PCF-LPG transmission spectrum and is smaller than the wavelength of a HiBi-FLM resonance peak. The central wavelength of the other optical filter is within the positive linear region of the PCF-LPG transmission spectrum and is greater than the wavelength of the HiBi-FLM resonance peak. The other ends of the two optical filters are optically connected with a photoelectric converter and a signal processing unit. The 3dB coupler, the polarization controller and the panda polarization maintaining fiber form a HiBi-FLM which is a sensing element. The PCF-LPG, the spectrometer, the optical filters, the photoelectric converter and the signal processing unit form a demodulator of the HiBi-FLM sensor. The invention effectively eliminates the jittering of the light source and the interference caused by various unstable factors of the sensing system, and greatly improves the system accuracy.
Owner:CHINA JILIANG UNIV
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