156 results about "Oxygen sensing" patented technology

The present invention provides a system, method and composition for detecting exposure of the contents of a container to one or more gases using a gas sensitive package sensor. The gas sensitive package sensor includes a ruthenium-based luminescence indicator composition having a ruthenium-based luminescence compound having one or more optical properties dispersed within a gas permeable polymer matrix. Exposure to one or more gases modifies the one or more optical properties of the ruthenium-based luminescence compound.

An apparatus with time controlled color change indication comprises an apparatus includes a disposable, limited or restricted use product and an oxygen sensing color changeable dye disposed on a portion of the apparatus, the dye being translucent or having a first color upon application and for a defined time thereafter and the dye changing color after exposure to oxygen for the defined time. For example, a packaging for containing a product for human consumption has a portion with a color changeable dye disposed thereon. The dye changes color after being exposed to oxygen for a controlled and predetermined period of time indicating that the product for human consumption should no longer be consume or has decreased in freshness, quality of taste or potency.

A polymeric sensing membrane having a Stern-Volmer constant within a pre-determined range of Stern-Volmer constants. The membrane includes a polymeric material having a fluorescent dye molecule dispersed therein. The dye molecule is capable of having its fluorescence collisionally quenched by a gas to be detected by the membrane. In one embodiment, the membrane includes a fluorescent dye molecule which has a relaxation time and a polymeric material having a permeability within a range of permeabilities defined by a mathematical function of the pre-determined range of Stern-Volmer constants. In another embodiment, the membrane includes a polymeric having a permeability and a fluorescent dye molecule having a relaxation time within a range of relaxation times defined by a mathematical function of the pre-determined range of Stern-Volmer constants.

The invention discloses a sheet type oxygen sensor and its manufacturing method. It includes heater basal body, reference gas channel body, and zirconium oxide sensing basal body. Insulating layer is set between the former two. And its inner is set many heating bodies. The up and down surfaces of the third are respectively set outer and inner electrodes. The reference gas channel is connected with the space and atmosphere where the inner electrode is set. Heater and oxygen sensing probe are burned together high temperature to be a whole to form direct heating structure. The invention has the advantages of simple structure, small size and quality, saving energy, fast response speed, greatly shortening weighting time, and obvious economic and social benefits.

The present invention relates to compositions comprising a core and a hydrophobic coating material surrounding the core. The core comprises at least one oxygen-sensing particle. The present invention also relates to methods of detecting and monitoring oxygen in a sample using the microencapsulated oxygen-sensing particles.

A high electron mobility transistor (HEMT) capable of performing as a CO₂ or O₂ sensor is disclosed, hi one implementation, a polymer solar cell can be connected to the HEMT for use in an infrared detection system. In a second implementation, a selective recognition layer can be provided on a gate region of the HEMT. For carbon dioxide sensing, the selective recognition layer can be, in one example, PEI/starch. For oxygen sensing, the selective recognition layer can be, in one example, indium zinc oxide (IZO). In one application, the HEMTs can be used for the detection of carbon dioxide and oxygen in exhaled breath or blood.

The invention belongs to the field of composite luminescent materials and discloses a fluorescent carbon dot/mesoporous molecular sieve composite luminescent material, a preparation method of the composite luminescent material and application of the composite luminescent material in the aspect of oxygen sensing. The preparation method of the composite luminescent material comprises the following steps: (1) preparing silane functionalized fluorescent carbon dots: under a stirring condition, adding anhydrous citric acid into a silane coupling agent and reacting at a constant temperature; purifying to obtain silane functionalized fluorescent quantum dots; (2) preparing the fluorescent carbon dot/mesoporous molecular sieve composite luminescent material: under the condition of taking ethanol as a solvent, taking a mesoporous molecular sieve to react with the silane functionalized fluorescent carbon dots prepared in the step (1) and purifying to obtain the fluorescent carbon dot/mesoporous molecular sieve composite luminescent material. The preparation method is simple, and the raw materials are low in price and have no toxin; the prepared composite luminescent material has high sensitivity and selectivity, stable performance, and quick response, the emission intensity is sensitive to oxygen concentration, and the composite luminescent material is an economical type green and environment-friendly oxygen sensing material.

The invention provides a process monitoring system for a laser precision forming technology. The process monitoring system comprises an oxygen sensing monitoring module, a temperature monitoring module, an optical monitoring module, a powder bed monitoring module and a central control system. Compared with the prior art, the process monitoring system has the beneficial effects that 1, more process information is acquired, and process phenomena of the laser precision forming technology are better understood; 2, the quality of laser precision formed parts is improved, and internal defects of the parts are decreased; and 3, closed-loop control of the laser precision forming process is established, and intelligence of laser precision forming is achieved.

The preparation method for nanometer lines comprises: coating a metal on the silicon substrate; placing the gallium powder into the boat; the substrate is placed at a location away from the boat in proper distance; heating and keeping the temperature; blowing nitrogen gas into the heating furnace; after cooling the heating furnace to the room temperature; the nanometer lines are formed in the substrate. The method for preparing the sensor comprises: depositing the golden electrode on the silicon substrate with SiO2 layer; the distance between two electrodes is 1 mu m; connecting single nanometer line to the electrode; connecting the lead; making aging process. The fast oxygen response of the sensor: at first, the free carrier concentration in the nanometer is very low; by adjusting the oxygen, its electric conductance is very week; under the illumination of the ultraviolet light, the current passing through the nanometer line is increased into a certain value, it show the oxygen concentration in short time; after closing the illumination, the photo-generated carriers are fast combined, the photo-driven oxygen sensing character disappears.

The invention provides a preparation method and application of polystyrene fluorescent microspheres, relating to the technical fields of high polymer material synthesis and environment detection, particularly a preparation method and application of fluorescent microspheres. The invention aims to solve the problem of poor monodispersity of the fluorescent microspheres used as an oxygen-sensing indication material at present. The preparation method comprises the following steps: adding ultrapure water into a reaction vessel, mechanically stirring at the rotation speed of 350-450 r/min in a nitrogen protective atmosphere for 25-35 minutes, adding a fluorescent indication material and polystyrene, continuing stirring for 10-20 minutes, adding a potassium persulfate water solution, and condensing at 65-75 DEG C to perform reflux reaction for 22-24 hours to obtain the polystyrene fluorescent microspheres. The polystyrene fluorescent microspheres are applicable to the field of detection of dissolved oxygen in a water body. The polystyrene fluorescent microspheres have the advantages of simple synthesis method, controllable size, high oxygen sensitivity and favorable reproducibility.

An oxygen-sensing assembly for attachment to a urinary catheter may include a housing having a flow pathway extending between an inlet end and an outlet end thereof, an oxygen sensor in operable communication with the flow pathway of the housing, the oxygen sensor configured to detect oxygen levels of a fluid flowing through the flow pathway, a flowrate sensor configured to detect a flowrate of the fluid flowing through the flow pathway, and a temperature sensor configured to detect a temperature of the fluid flowing through the flow pathway.

An apparatus for oxygen sensing is provided. The apparatus for oxygen sensing includes: a header part to generate interference wave to light generated in a light source by the principle of fiber Fabry-Perot interferometer; and an optical spectrum analyzer to decide existence of oxygen based on change of spectrum periodicity of the above interference wave, in which the header part includes a sensing material of which effective refractive index changes by combination with the oxygen and the above interference wave changes its spectrum periodicity depending on change of effective refractive index of the above sensing material.

Oxygen levels in biological tissue or systems can be measured by the phosphorescence quenching method using phosphorescent porphyrin probes, also referred to as a dendritic oxygen probes, with controllable quenching parameters and defined biodistributions. Provided are a “next generation” of oxygen sensors with substantially improved phosphorescence emission for better imaging capabilities, ease of use, increasing the quantum efficiency (phosphorescence intensity) and extending their range of applicability including constructing a class of oxygen sensors for making measurements in organic media. In addition, provided are methods for synthesizing new porphyrin constructs in which the porphyrin is made less flexible and more planar, changing with decrease internal quenching, and thereby increasing the phosphorescence emission used for oxygen sensing. Additional methods are provided for structurally modifying the dendrimer used to encapsulate the porphyrin phosphor to provide internal quenching of singlet oxygen molecules formed during oxygen measurements.

The invention relates to an oxygen-sensitive photoluminescence material and a preparation method and application thereof. The invention discloses a new copper complex, namely [Cu(POP)(PTZ)]BF4, a composite luminescent material formed by the copper complex and inorganic mesoporous molecular sieve as well as the application of the material in oxygen sensing. The copper complex is dissolved in solvent; then the mesoporous molecular sieve material MCM-41 is dispersed in the copper complex solution, wherein the mass ratio of the copper complex and the mesoporous molecular sieve is 1:100 to 3:100, and the obtained solution is stirred at room temperature and filtered; and finally the solvent is used for washing the solid for three times, and the solid is dried naturally in the air, thus obtaining the composite luminescent material. The material is white, and has luminescent characteristic under an ultraviolet lamp with the maximum emission at the wavelength of about 500nm. The invention, compared with the existing expensive noble metals, has the advantages of low price, simple preparation method, high sensitivity and low toxicity, and is especially suitable for preparing oxygen sensors.

This invention discloses a method for preparing yttria with its weight percentages of 2-24wt% doped Zirconia nanometer crystal and noncrystal co-constitutive ball-shaped ceramics powder, including cubic phase, tetragonal phase, monoclinic phase nanometer crystal and amorphous, with the complex structure of: even distribution of nanometer crystal and amorphous and nanometer crystal coated with amorphous. The production procedures comprise: coprecipitation, gelatin being slurried, spray-drying, low middle temperature amorphous sintering and high temperature quick surface sintering. This method is of simple process, simple equipment, low cost and can be commercial production. This inventive powder is suitable for parlicularly thermal barrier coating, fuel cell coating, oxygen-sensing coating, corrosion-resistant coating, abrasion-resistant coating; used for manufacturing oxygen-sensor, ceramic-plate of integrated circuit, in aerospace fields.

The invention relates to a preparation method of a metalloporphyrin oxygen sensing film. According to the preparation method, the problems that after a phosphorescent reagent is embedded in an oxygen sensing film prepared by virtue of existing methods, the sensitivity is low, the response time is long, and the phosphorescent reagent is easily optically degraded and is low in linear fitting are solved. According to the preparation method, the oxygen sensing film is prepared by taking octaethyl porphilin platinum as an indicator, methyl methacrylate and trifluoroethyl methacrylate as copolymer matrixes, tributyl phosphate as a plasticizer and an azodiisobutyronitrile toluene solution as an initiator. The preparation method is used for preparing the metalloporphyrin oxygen sensing film.

The invention discloses a composite luminescent material as well as application thereof on oxygen sensing aspect. A copper complex has an expression formula of [Cu(POP)(ptpm)]BF4 and has a chemical structural formula which is shown in the specification; the composite luminescent material is formed by loading the copper complex formed by a phenanthroline derivative and metal copper ions into an inorganic mesoporous molecular sieve duct. The copper complex emits green-yellow light under a 365nm ultraviolet lamp, has maximal emission peak near 510nm, is cheap in price, smaller in toxicity and easier to prepare. Moreover, the copper complex/composite luminescent material disclosed by the invention has emission intensity sensitive to oxygen gas concentration, and is an economical, green and environment oxygen sensing material.

The invention discloses a multifunctional nano-composite having up-conversion luminescence, oxygen sensing and biological connectivity and a preparation method thereof, in particular relates to a multifunctional nano-composite with a core-shell structure formed by connecting a [Ru(phen)2phen-Si]Cl2 complex with NaYF4:Yb<3+> and Tm<3+> nano-particles by using a SiO2 shell and preparation thereof. The nano-composite and the method solve the problems of the single structure of composites and a complex preparation process in the conventional fields of biomedicine and biochemistry. The composite comprises the [Ru(phen)2phen-Si]Cl2 complex, SiO2, and the NaYF4:Yb<3+> and Tm<3+> nano-particles in a mass ratio of 40-100:1.1-3.3:13.4-53.4. Due to the functions of the multifunctional composite, the application of the multifunctional composite in the fields of the biomedicine, such as biomarkers, oxygen concentration measurement in organisms and the like, is enhanced.

The sensing head is made of plastic optical fiber-polymethyl methacrylate; said sensing head is U-shaped, biconical, biconical + U-shaped, or filament-shaped; on the sensing head the sensitized material is coated. The preparing method is: using the knife to cut off certain length sleeve of the plastic optical fiber; using the alcohol cotton ball to clean up the optical fiber; using the optical fiber to make an optical sensing head in any shapes; putting the optical sensing head into the sol-gel solution; using the crystal pulling method to coat a layer of sensitized material; drying the sensing head in room temperature.

The invention discloses preparation for an oxygen sensing film and a device and a method for measuring micro dissolved oxygen in non-aqueous media, and belongs to the technical field of oxygen sensors. Mixed solution prepared from aqueous solution of polyvinylbutyral and ruthenium polypyridyl is coated on a glass slide, and is dried for standby to prepare the oxygen sensing film; the oxygen sensing film is put into a cuvette with a plug; the measuring device consists of nitrogen saturation, oxygen saturation, two peristaltic pumps, the cuvette in which the oxygen sensing film is placed, a fluophotometer, a recorder and an effluent liquid pipe; non-aqueous media to be measured are respectively put into two reagent bottles; one reagent bottle is introduced with O2 to saturation, and the other reagent bottle is introduced with N2 to saturation; the rotating speed of the two peristaltic pumps is accurately adjusted and controlled, so that the total flow rate of the oxygen saturated solution and the nitrogen saturated solution is kept constant; the volume ratio of the oxygen saturated solution to the nitrogen saturated solution is adjusted to prepare non-aqueous media solution to be measured with different oxygen concentration by a tee valve mixing method; the fluorescence intensity is measured under excitation wavelength of 465nm, a Stern-Volmer curve of a sample is drawn, and the fluorescence intensity is reduced along the increase of the oxygen content in the non-aqueous media.

The preparation of oxygen-sensing sensor includes the steps of: preparation of titanium trichloride doped with certain amount of niobium or tantalum pentachloride as source matter; addition of hydrogen peroxide as strong oxidant and DBS surface cladding agent and stirring at 50-70 deg.c water bath for 3-5 hr to form gel; mixing obtained powder with terpineol and painting the mixture to ceramic tube with brush-type electrodes; sintering in a muffle furnace at 380-450 deg.c for 1 hr to prepare niobium or tantalum pentachloride doped TiO2 nanometer powder, addition of heating filament to preparethe thick-film oxygen-sensing element; and aging through electrical heating for 10 dyas. The present invention has low working temperature, high sensitivity, fast response and high stability.

The invention relates to a ratio-type transition metal porphyran polymer luminescent oxygen sensing material and a construction method thereof. BODIPY with strong luminous intensity is uniformly mixed with a transition metal porphyran complex in a certain ratio, BODIPY and the transition metal porphyran complex are stably connected together under the crosslinking action and then cover on a quartz sheet, so that the ratio-type transition metal porphyran polymer is constructed; BODIPY is not sensitive to oxygen while the transition metal porphyran complex is sensitive to oxygen, and determination of ratio-type oxygen sensing is realized by comparing the luminescent intensity ratio of BODIPY to the transition metal porphyran complex; besides, a transition metal complex with three different triple excited state lives is selected, and wide-range oxygen content can be accurately determined. The ratio-type transition metal porphyran polymer luminescent oxygen sensing material has the advantages that an oxygen sensing membrane is fixed in an optical fiber circulation tank and oxygen content can be accurately determined when being combined with a luminoscope.