35results about How to "High sensitivity response" patented technology

The invented optical-fibre grating vibration sensor is characterized by that it utilizes a demodutation grating and a sensing grating and makes them be series-connected together, and respectively makes them be stuck on a main beam and an auxiliary beam, two beams are made of identical material and have identical heat expansion coefficient, so that their central wavelengths can be synchronously shifted with temperature, therefore they have automatic temperature compensation function so as to implement matching filter demodutation. Said invention utilizes the detection of light intensity change of sensing grating reflecting light to monitor the parameters of vibration frequency and vibration amplitude of monitored body, finally utilizes computer or single-chip computer to make analysis and processing of body vibration frequency spectrum.

The invention relates to a method for preparing flake porous ZnO nano powder, which comprises the following steps: adding ammonia into solution of zinc nitrate dropwise, and adjusting the pH of the solution to between 6 and 8; under the condition of stirring by magnetic force at the rotating speed of 0 to 180r/m, performing reaction at the temperature of between 0 and 80DEG C for 0.5 to 3 hours; separating, washing and drying the obtained cloudy solution to obtain a crosslinked flake and dispersed flake basic zinc nitrate precursor; and calcinating the basic zinc nitrate precursor with the two appearances at the temperature of between 220 and 500DEG C for 0.5 and 3 hours to obtain the flake porous ZnO nano powder. The nano ZnO product prepared by the method is white powder, belongs to a hexagonal system, has large specific surface area, high purity and good product quality, and responds to gas such as ethanol and acetone sensitively.

The invention relates to a preparation method of a graphite oxide phase carbon nitride modified electrode. The preparation method comprises the following steps: (1) preparing graphite oxide phase carbon nitride; and (2) preparing a graphite oxide phase carbon nitride sensor. The electrode is applied to detecting heavy metal ions. Graphite oxide phase carbon is of a three-dimensional hole structure which is large in specific surface area and contains hydrophilic groups such as hydroxyl, carboxyl, and epoxy groups. The graphite oxide phase carbon is applied to an electrochemical sensor. The heavy metal ions Cu<2+> are detected by virtue of a different pulse stripping voltammetry, and influence of factors such as enriching time, enriching potential, the pH value of a solution, and modification amount on stripping peak current can be optimized. Under an experimental condition that the enriching time is 300s, the enriching potential is -0.6V, the pH value of the solution is 4.68 and the modification amount is 12 microliters, a standard curve represents a good linear relationship, wherein the linear range is (1.60*10<-15>-6.31*10<-15>mol/L, the linear equation is ip(microA)=1.2533C(micro mol/L)+6.2232, the correlation coefficient (R) is 0.9989, and the limit of detection (S/N=3) reaches 1*10<-16>mol/l. The electrode has ultrahigh sensitivity to heavy metal ion detection.

The present invention relates to a preparation method and an application of a dual-response fluorescent molecular probe for detecting ClO<->/H2S based on hydrogen ion activation. The method comprises the steps of dissolving NBD-Cl in chloroform, adding a hydrazine hydrate-methanol solution, and performing uniform mixing to obtain a product 1; dissolving the product 1 in ethanol, adding benzaldehyde and glacial acetic acid, and conducting refluxing, cooling, precipitation, etc. to obtain the final product. The fluorescent molecular probe is applicable to qualitative analysis and quantitative analysis of ClO<->/H2S in biological samples, and detection is sensitive, accurate and fast; the biological samples mainly include gastric juice, gastric mucosa, cells, and so on. The fluorescent molecular probe can be used in the related fields of analytical chemistry, life organic analysis, disease pre-diagnosis and clinical examination.

The invention discloses an application of a two-dimensional palladium selenide nano film for detection of broadband polarized light signals. The application is characterized in that the two-dimensional palladium selenide nano film is taken as a light sensitive layer to make a polarization-sensitive photoelectric detector, and detection of the broadband polarized light signals is realized. The application is advantaged in that the polarization-sensitive photoelectric detector made based on the two-dimensional palladium selenide nano film has significant response to the polarized light signals,and thereby accurate and stable detection of the wavelength-covered ultraviolet, visible and infrared polarized light signals in the complex electromagnetic environment can be performed.

The invention belongs to the photonics device field and relates to a supporting column-supported echo wall mode photonics device, a preparation method thereof and the use of the device. In particular,the present invention provides a supporting column-supported micro disk. The supporting column of the supporting column-supported micro disk comprises a first electron beam resist; the micro disk comprises a second electron beam resist; and the molecular weight of the first electron beam resist is lower than that of the second electron beam resist. The supporting column-supported micro disk, a micro disk array structure, an echo wall mode optical resonant micro-cavity and a photonics device of the invention have the advantages of simple preparation process, convenient operation and low cost,and can be prepared on a large scale, have high quality factors and spectral modulation functions. With the preparation method adopted, a problem that a substrate needs to be separately etched in a traditional high-quality micro-cavity preparation process can be solved; and the coupling effect of a plurality of micro-cavities can be realized. The method has high practicability, and is especially suitable for the design and application of photonics integrated components.

The invention discloses zinc tungstate/zinc oxide heterogeneous nanofiber as well as a preparation method and application thereof. The preparation method comprises the steps that the molar weight of zinc nitrate is fixed in an electrostatic spinning precursor solution, the molar weight of phosphotungstic acid is regulated and controlled, the precursor solution is mixed and stirred to be uniform, then electrostatic spinning is conducted, and calcination is conducted in air, so that the zinc tungstate/zinc oxide heterogeneous nanofiber synthesized with the assistance of polyoxometallate is obtained. The one-dimensional heterogeneous nanofiber is composed of zinc tungstate and zinc oxide compounded with the zinc tungstate, and has an n-n type heterogeneous nanofiber structure. When the heterogeneous nanofiber is used as a gas sensitive sensor, a gas sensitive test result shows that the gas sensitive sensor has the characteristic of high-sensitivity quick response to triethylamine. In combination with excellent electron transfer performance and large specific surface area of the zinc tungstate/zinc oxide heterogeneous nanofiber, the gas sensitive sensor can realize high-selectivity, high-sensitivity and long-term stable detection of the triethylamine.

The invention discloses a licker-in micro-current leveling device of an automatic cotton carding machine. The device comprises an independent motor and a micro-current inductor; the independent motoris installed on the automatic cotton carding machine, any power supply line of the independent motor is connected with the input end of the micro-current inductor, the output end of the micro-currentinductor is connected with the input end of a main control board, the input end of the main control board is connected with the input end of a frequency converter, and the output end of the frequencyconverter is connected with the input end of a speed reduction motor of a cotton feed roller. The cotton supply roller can directly enter the licker-in through the cotton feed procedure, the licker-incan directly send cotton feed changes, and therefore the cotton feed roller speed can be accurately adjusted in time.

The invention discloses a receiving transducer with adjustable working frequency which comprises a plurality of coupled Helmholtz resonant cavity structure units which are arranged together. Each coupling Helmholtz resonant cavity structure unit comprises a thin-wall circular tube extension neck, a piezoelectric material and two coupled Helmholtz resonant cavities. Each Helmholtz resonant cavity comprises a perforated top wall, a non-perforated bottom wall, a side wall, a front panel and a rear panel. Each side wall is located between the two coupled Helmholtz resonant cavity structure units,and each front panel and each rear panel are used for forming a closed cavity; openings in the top walls of the two Helmholtz resonant cavities are the same or different in size, thin-wall circular tube extension necks are arranged in the openings in the top walls in a penetrating mode, piezoelectric materials are arranged between the two Helmholtz resonant cavities, and the piezoelectric materials are formed by pressing piezoelectric ceramic pieces and electrode pieces. The whole structure and the manufacturing process are simple, array processing is easy to achieve to improve the sensitivity, series-parallel connection processing can be conducted according to needs, and the cost is low.

The invention discloses an anti-dispersion structure of an electron multiplying charge-coupled device(EMCCD). According to the structure, an anti-dispersion channel is arranged in an imaging unit in an imaging area of the EMCCD; signal channels in the imaging unit in the imaging area of the EMCCD are arranged on two sides of the anti-dispersion channel. Excess photon-generated carriers generated due to glare irradiation or relatively over long light integrating time overflow to the anti-dispersion channel, and are converted into current to be released through the anti-dispersion channel, so as to inhibit dispersion phenomenon. According to the anti-dispersion structure, not only a low-light level imaging system based on the EMCCD has higher response sensitivity, but also the dynamic range of the low-light level imaging system taking the image sensor of the EMCCD as a core device is greatly broadened.