13results about How to "Good linear response" patented technology

The invention provides a flexible capacitive three-dimensional force sensor and a preparation method thereof. The sensor sequentially comprises a flexible substrate, a bottom pole plate, a composite dielectric layer, a top pole plate and a packaging layer from bottom to top, wherein at least three bottom pole plates are arranged and are arranged in a triangular shape; when the packaging layer is subjected to external force, the force is sequentially transmitted to the top electrode plate and the composite dielectric layer through the packaging layer, the composite dielectric layer deforms under the force, the capacitance value between the bottom electrode plate and the top electrode plate is changed, and the capacitance value between the bottom electrode plate and the top electrode plate is measured according to the change of the capacitance value between different bottom electrode plates and top electrode plates before and after the force is applied. And analyzing to obtain the direction and the magnitude of the external force. According to the flexible capacitance type three-dimensional force sensor, the three-common-plate capacitor structure is adopted, when the force is applied, the numerical value of the tangential force can be measured through the relative displacement and the opposite area of the upper and lower electrode plates of the three capacitors, the direction of the force is determined through the increase and decrease change of the capacitors, and therefore three-dimensional force detection is achieved.

The invention provides a method, a primer and a probe for qualitatively / quantitatively detecting an astragalus component in a Chinese patent medicine. The method for qualitatively or quantitatively detecting the astragalus membranaceus component in the Chinese patent medicine is constructed on the basis of the specific primer pair, the probe and ddPCR. The quantitative detection method comprises the following steps: extracting DNA (Deoxyribose Nucleic Acid) of a Chinese patent medicine which has a known feed ratio and contains astragalus membranaceus components in different proportions, and carrying out ddPCR amplification reaction based on a specific primer pair and a probe to determine copy number ranges corresponding to the astragalus membranaceus components in different proportions; dNA of the Chinese patent medicine to be detected is extracted, ddPCR amplification reaction is carried out based on the specific primer pair and the probe, and the target DNA copy number of astragalus membranaceus is calculated; and determining the content of the astragalus component in the Chinese patent medicine to be detected through comparison. The method provided by the invention can qualitatively and quantitatively detect the astragalus membranaceus component in the Chinese patent medicine in a high-specificity and high-sensitivity manner, and a new technical means is provided for quality control of Chinese patent medicine bulk drugs.

The invention discloses a fluorescent substrate 7-HC-P-E, a preparation method thereof and application of the fluorescent substrate 7-HC-P-E in detection of the active concentration of alkaline phosphatase (ALP). The fluorescent substrate can be catalytically hydrolyzed by ALP under an alkaline condition to release 7-hydroxycoumarin (7HC) with a strong fluorescent signal, so that high-sensitivity and high-specificity detection on the enzyme activity is realized. The invention further provides a synthesis route and an optimization process of the fluorescent substrate, the operation is simple and convenient, the product purity is high, and the fluorescent substrate is suitable for multiple fields such as biological analysis, medical diagnosis and environmental monitoring.

The invention discloses a conductive elastomer composite material as well as a preparation method and application thereof. The composite material comprises a film I and a film II positioned on the surface of the film I, the thin film II is provided with a wrinkle structure; the raw materials of the film I comprise a flexible substrate I and a conductive filler I; the thin film II is prepared from the following raw materials: a flexible substrate II and a conductive filler II; the conductive filler I and the conductive filler II are different; and the mass ratio of the conductive filler II to the flexible substrate II is (20-100): 100. The flexible strain sensor prepared from the composite material combines a double-layer network conductive structure and an asymmetric wrinkle design, realizes improvement of sensitivity, and has a wide linear range and high linearity.

The invention provides a high-precision flexible pulse wave sensor, a manufacturing method of the high-precision flexible pulse wave sensor and a blood pressure monitoring device and method based on pulse wave signals. The sensor is prepared by taking melamine sponge, polydopamine (PDA) and carbon nanotubes (CNT) as main materials through specific soaking and drying processes, and has good linear response and ultralow detection limit. In combination with an extreme learning machine (ELM) blood pressure model, the device can realize high-precision and real-time blood pressure prediction, improves the prediction precision and speed, is suitable for stably measuring pulse waves for a long time, and has a wide application prospect.

A humidity sensor based on a small-diameter fiber bragg grating is characterized by comprising a fiber bragg grating demodulator, a 2 * 1 fiber coupler, a transmission fiber, a temperature sensing fiber bragg grating and a humidity sensing fiber bragg grating, the fiber bragg grating demodulator comprises a broadband light source output part and a signal demodulation part. The humidity sensing fiber bragg grating is prepared on a small-diameter optical fiber, a gate region is coated with polyimide added with lithium bromide with the concentration of 0.5-2%, the thickness of a coating layer ranges from 10 micrometers to 100 micrometers, and the humidity sensing fiber bragg grating is used for sensing relative humidity. Compared with a traditional fiber bragg grating humidity sensor, the fiber bragg grating humidity sensor has higher sensitivity, better humidity linear response and shorter response time due to the fact that the small-diameter fiber bragg grating has higher deformation quantity compared with the traditional fiber bragg grating humidity sensor.

The present invention relates to a fuel cell vehicle hydrogen emission concentration tester, comprising an exhaust gas sampler for collecting exhaust gas from a fuel cell vehicle; a dryer for drying the collected exhaust gas; a sampling pump (4) for introducing the dried exhaust gas into a thermal conductivity cell (5); and a thermal conductivity cell (5) for detecting the hydrogen concentration in the exhaust gas. The exhaust gas sampler is connected to the thermal conductivity cell (5) through the dryer and the sampling pump (4) in sequence. Compared with the prior art, the present invention can detect hydrogen concentration in a wide range and has high detection accuracy.

The invention provides a self-adaptive reconfigurable high dynamic range infrared detector and a control method thereof. The detector comprises a first electrode, an N-type InP layer and an intrinsic InGaAs layer, an annular P-type InP region is arranged on the outer side of the side wall of the intrinsic InGaAs layer, an oxide layer is arranged on the surface of the other side of the intrinsic InGaAs layer, and a transparent electrode is arranged on the oxide layer; and a second electrode is arranged on the P-type InP region. By applying voltage to the transparent electrode, the energy band structure and the carrier transport characteristic of the InGaAs surface can be regulated and controlled: zero bias or positive bias voltage is applied under weak light, and high sensitivity is maintained; negative bias voltage is applied under strong light, a high-concentration hole high-conductivity channel is formed on the surface of the InGaAs in an induction mode, hole collection is accelerated, and charge accumulation and an electric field shielding effect are eliminated. Therefore, linear response in a wide dynamic range is realized under the condition that external attenuation devices are not added.

A porous hollow spherical photonic crystal sensor for detecting xylene gas and a method thereof, comprising synthesizing PS@SiO2 core-shell colloids, assembling into spherical photonic crystals by microfluidics, calcining to remove the polystyrene inner core to form a hollow SiO2 structure, and introducing a porous structure by controllable chemical etching. Subsequently, functionalization is performed by using P(VBC-co-MMA) to obtain a porous hollow spherical photonic crystal sensor, which is endowed with strong molecular affinity for xylene, and selective gas adsorption of the porous photonic crystal is realized. Benefiting from the super-symmetrical spherical structure, the obtained photonic crystal sensor exhibits an inherent angle-independent optical response, overcoming the limitation of angle dependence of thin film photonic crystal sensors. Exposure to xylene gas shows a significant reversible red shift of the optical stop band and a clear color change, which is due to the increase of the effective refractive index caused by vapor diffusion and adsorption. By monitoring the movement of the optical stop band in air and saturated xylene, visual detection of xylene gas can be realized.

The invention discloses a preparation method and application of a Co3O4 / In2O3 heterostructure, and the preparation method at least comprises the following steps: grinding and mixing Co3O4 and In2O3 powder, and calcining to obtain the Co3O4 / In2O3 heterostructure. The preparation method comprises the following steps: firstly, physically mixing Co3O4 and In2O3 by adopting a mechanical grinding method, further calcining the mixed Co3O4 / In2O3 at a high temperature, and enabling Co3O4 and In2O3 to interact under the induction of heat to form a heterostructure. The Co3O4 / In2O3 heterostructure based hydrogen sensor is prepared by taking the Co3O4 / In2O3 heterostructure as a gas sensing film. In hydrogen sensing detection, the response value of the Co3O4 / In2O3 heterostructure-based hydrogen sensor to 10 ppm hydrogen at 200 DEG C can reach 100, and the defect of poor hydrogen sensing performance is overcome.

This invention belongs to the field of biomedical materials and flexible sensing technology, and particularly relates to an implantable pressure sensor, its preparation method, and its application. The pressure sensor has a three-layer parallel plate structure, wherein the electrode layer is a conductive hydrogel prepared from polymerizable zwitterionic monomers, the dielectric layer is a microphase-separated hydrogel formed by copolymerization of acrylamide monomers and acrylate monomers, and the encapsulation layer is a biocompatible polymer fiber membrane. By controlling the material composition, polymerization conditions, and structure, the device achieves good matching with biological soft tissues in terms of water content and tissue adaptability. In terms of functional characteristics, the implantable sensor exhibits advantages such as sensitive pressure response and strong cyclic stability, and can be applied in fields such as tissue engineering, physiological or pathological signal monitoring, neural stimulation modulation, and drug delivery.

The invention discloses a novel low-afterglow scintillator single crystal and a preparation method thereof, and belongs to the technical field of materials. A novel scintillator CsCu2Br3 single crystal is prepared through a cooling crystallization method for the first time. The specific preparation method comprises the steps that CsBr and CuBr are put into a crystal growth bottle, and a hypophosphorous acid solution and a hydrobromic acid solution are sequentially added; the preparation method comprises the following steps: preparing a precursor solution, then sealing the solution, then putting the solution into an oil bath pan, setting the temperature to 90 DEG C for 24 hours, and then carrying out three-stage gradient cooling, in the first stage, rapid cooling is that the temperature of the precursor solution is reduced to 66 DEG C from 90 DEG C within 10 hours; in the second stage of extremely slow cooling, the temperature of the precursor solution is reduced to 60 DEG C from 66 DEG C at the speed of reducing 2 DEG C every day; in the third stage, the temperature of the precursor solution is reduced to 55 DEG C from 60 DEG C at the speed of reducing 2.5 DEG C every day until the growth of the crystal is finished, and then the crystal is put into a vacuum drying oven to be subjected to constant-temperature drying treatment for 24 hours to finally prepare the CsCu2Br3 centimeter-level single crystal with fewer nucleation points and better seed crystals, and the prepared CsCu2Br3 single crystal has the characteristic of low afterglow, and can be used for preparing the CsCu2Br3 centimeter-level single crystal. The method can be applied to the fields of X-ray imaging and CT imaging.

The application belongs to the field of fluorescent probes, and discloses a kind of fluorescent probe for monitoring dynamic change of hydrogen peroxide in different subcellular organelles, preparation method and application thereof, the probe is with flavonol as parent nucleus, and hydrogen peroxide ratio type fluorescent probe PML is targeted to lysosome, and hydrogen peroxide ratio type fluorescent probe PZD is targeted to lipid droplet.The application also provides the preparation method and application of the probe.The probe provided by the application has novel structure, simple synthesis method, good recognition effect on hydrogen peroxide, especially hydrogen peroxide in subcellular organelles, fast response speed, high sensitivity, reliable inspection result, good biocompatibility, subcellular organelle positioning function, so that they can be used for monitoring hydrogen peroxide in intracellular microenvironment, and it has great significance to apply probe technology to practical related pathological model to develop the mechanism of hydrogen peroxide in its pathology, especially in the process of ferroptosis.