561 results about "Chemical sensor" patented technology

The invention discloses a kit raw material quality detection method based on multi-modal data fusion, and relates to the technical field of automatic quality detection of chemical reagent raw materials. Comprising the following steps: S1, synchronously acquiring spectral data, microscopic image data and chemical detection data of a kit raw material through a spectral sensor, microscopic imaging equipment and a chemical sensor; s2, inputting the multi-modal data into a self-adaptive spatial-temporal feature calibration network, and analyzing local detail features and global time sequence features of the modal data through a multi-scale spatial-temporal feature extraction module; according to the kit raw material quality detection method based on multi-modal data fusion, by constructing a collaborative fusion system of an adaptive spatial-temporal characteristic calibration network and a layered information entropy screening mechanism, the core technical problems of misalignment of multi-modal data dynamic alignment and redundant interference accumulation are solved.

An electrochemical sensor extracts information from biofluid systems by harnessing a nonlinear dynamic electrochemical model and stochastic voltage or current input. It uses a black-box approach that describes the fluid's state and predicts its evolution over time using a collection of model parameters, nonlinear dynamic measurement modes, and modeling techniques. For example, the sensor can use principal component analysis to reduce the set of (potentially hundreds) of model parameters to a handful of latent variables which evolve independently of each other. The sensor can use a set of these latent variables as a description of the state of the fluid. For a given sample fluid (e.g., milk containing contaminants), the sensor collects trajectories of the fluid state over time under varying conditions, permitting the training of a machine learning model to predict either fluid state trajectories or time until the fluid state crosses a given threshold (e.g., spoilage).

The invention discloses an electrochemical sensor calibration method and equipment. The method comprises the following steps: acquiring probe data, temperature and humidity data and gas characteristic data of a sensor to be calibrated; according to the probe data, constructing a dynamic updating model for dynamically updating the zero data of the sensor to be calibrated; according to the temperature and humidity data, constructing a temperature and humidity compensation model for performing temperature and humidity compensation on the to-be-calibrated sensor; according to the gas characteristic data, a multi-gas correction model is constructed, and the multi-gas correction model is used for correcting output data when the sensor to be calibrated is in different gas types; the dynamic updating model, the temperature and humidity compensation model and the multi-gas correction model form a calibration model of the sensor to be calibrated; and calibrating the to-be-calibrated sensor according to the calibration model to obtain a calibration result which is used for indicating the to-be-calibrated sensor to be calibrated and then output. The output data of the sensor to be calibrated in different gas types can be corrected, and the problem that accurate measurement cannot be achieved in a multi-gas interference scene is solved.

A system may include a flow valve coupled to a gas inlet of a landfill gas system and a pump coupled to the flow valve and configured to draw gas from the landfill gas system via the gas inlet. The system may further include an oxygen sensor comprising at least one laser configured to detect oxygen concentration in the gas, a carbon dioxide sensor comprising at least one infrared light source configured to detect carbon dioxide concentration in the gas, and / or one or more chemical sensors configured to sense concentrations of a respective one or more chemicals in the gas. A microprocessor may determine sensed data including at least the oxygen concentration, the carbon dioxide concentration, concentrations of the one or more chemicals, the static pressure, the atmospheric pressure, and / or a differential pressure, and communicate the sensed data to a mobile control device.

Embodiments herein relate to an optical chemical sensor system that is wearable and includes a microneedle array. In one embodiment, the invention includes a chemical sensing device having a set of microneedles and sensor elements. The sensor element may include a first low refractive index gel layer, a second low refractive index gel layer, and a chromogenic ionophore sensing film disposed between the first low refractive index gel layer and the second low refractive index gel layer. In one embodiment, a retardation layer may be disposed between the sensor element and a set of microneedles. An optical emitter may be configured to emit light into the sensor element. An optical detector may be configured to receive light from the sensor element. Other embodiments are also included herein.

The invention provides a flexible electrochemical sensor, a preparation method and application. The flexible electrochemical sensor comprises a flexible substrate, three electrodes, a conductive strip, an external wire and a multi-cavity polypyrrole film, the three electrodes comprise a working electrode, a reference electrode and an auxiliary electrode and are printed on the flexible substrate; the conductive strip is connected with the three electrodes, the conductive strip is packaged through an insulating tape, and only working areas of the three electrodes are exposed; the external wire is pasted on the conductive strip through conductive silver adhesive. The multi-cavity polypyrrole film is modified on the surface of the working electrode. The technical problems that existing equipment is insufficient in portability, cannot meet the requirements of on-site rapid screening and real-time analysis of large-batch samples, and is difficult to realize on-site mobile detection are solved. The invention provides a feasible technical means for portable, mobile and on-site rapid detection of high-harm heavy metal ions such as Hg < 2 + > and Cd < 2 + >, and the method is simple to operate and extremely low in cost.

The invention relates to an electrochemical sensor for monitoring beta cell insulin secretion in real time and a preparation method and application thereof, the sensor is an electrochemical chip modified by a multi-dimensional nano material, and the multi-dimensional nano material on the electrochemical chip is used for capturing dopamine released by beta cells; and determining the release quantity of dopamine according to the electrochemical signal. According to the method, the insulin secretion condition of the beta cells is monitored in real time by taking dopamine as a tracer agent, and the exocytosis process of the beta cells can be researched under natural and normal conditions. According to the invention, only a common Faraday cage and a basic electrochemical workstation are needed for detection, one or more beta cells can be detected, the operation is simple, and the research efficiency of insulin secretion is greatly improved. In addition, the medicine for regulating beta cell insulin secretion can be efficiently screened, and a foundation is laid for research of diabetes treatment medicine.

The invention discloses a dual-emission molecular imprinting ratiometric fluorescence sensor, a preparation method thereof and application of the dual-emission molecular imprinting ratiometric fluorescence sensor in aureomycin detection, and belongs to the technical field of chemical sensors. The preparation method of the sensor comprises the following steps: preparing silicon dioxide-quantum dot composite nanoparticles, and preparing a molecularly imprinted polymer by taking salicylamide as a template molecule; and mixing the molecularly imprinted polymer and the silicon dioxide-quantum dot composite nanoparticles in an HEPES buffer solution by adopting a post-mixing strategy to construct the dual-emission molecularly imprinted ratiometric fluorescence sensor. The double-emission molecular imprinting ratiometric fluorescence sensor has the beneficial effects that the double-emission molecular imprinting ratiometric fluorescence sensor provided by the invention is rich in fluorescence color change, rapid, high-sensitivity and visual detection of aureomycin can be realized, the whole detection process is simple, convenient and rapid, and the double-emission molecular imprinting ratiometric fluorescence sensor is suitable for being widely popularized in practical application.

The embodiment of the invention provides an intelligent drainage tube, a preparation method thereof and a drainage tube body. Wherein the drainage tube body is used for being placed in a drainage area of a receptor; a flexible electrochemical sensor module, a signal processing module and a wireless transmission module are integrated at the top of the drainage tube body; wherein the flexible electrochemical sensor module is arranged in a drainage area, and the flexible electrochemical sensor module is electrically connected with the signal processing module and the wireless transmission module in sequence; the flexible electrochemical sensor module is used for collecting one or more biological index parameters in drainage liquid in a drainage area and converting the biological index parameters into detection electric signals; the flexible electrochemical sensor module transmits one or more detection electric signals to the signal processing module; and the signal processing module amplifies one or more detection electric signals and outputs the amplified detection electric signals to the monitoring equipment through the wireless transmission module.

Provided is a potentiostat-based electrochemical sensor detection device. The device comprises: a digital-to-analog converter (DAC) configured to receive a digital signal from a waveform generator and digital logic and output an analog signal corresponding to a reference voltage; a control amplifier (CA) configured to receive the analog signal corresponding to the reference voltage and apply the reference voltage to a reference electrode (RE); a gain-boosting current mirror configured to copy a sensor current of an electrochemical sensor and output a copied sensor current; a transimpedance amplifier configured to convert the copied sensor current into a voltage signal; a low-pass filter configured to block a high-frequency band signal component of the voltage signal; and an analog-to-digital converter (ADC) configured to perform digital signal processing on a signal having passed through the low-pass filter, wherein at least one of the gain-boosting current mirror and the transimpedance amplifier employs a dynamic element matching (DEM) technique using a plurality of choppers and a plurality of DEM clock signals.

The invention discloses a sodium iodide probe assisted gold nanoparticle-polyarginine-polylysine electrochemical sensor and an application thereof. The composite electrode provided by the invention comprises an electrode substrate and a nano composite film modified on the surface of the electrode substrate, the nano composite membrane comprises gold nanoparticles, polyarginine and polylysine. The invention further provides an electrochemical sensor which is constructed by combining the sodium iodide probe and the composite electrode and is used for detecting nitrite. The electrochemical sensor has the advantages of simplicity, rapidness, low detection limit, wide response range, good reproducibility, high selectivity and the like. The electrochemical sensor can be used for measuring the content of nitrite in beef and tap water samples, the recovery rate is satisfactory, and the electrochemical sensor has potential application prospects in the aspects of food safety and environmental protection.

The invention discloses a hexachlorophenol electrochemical sensor built based on NiFe-coated C / MoO3 and a preparation method and application thereof.The hexachlorophenol electrochemical sensor comprises a working electrode, an auxiliary electrode and a reference electrode, the working electrode is a NiFe-coated C / MoO3 modified electrode and is composed of a glassy carbon electrode and a NiFe-coated C / MoO3 composite material modified on the glassy carbon electrode, the auxiliary electrode is a NiFe-coated C / MoO3 modified electrode, and the reference electrode is a NiFe-coated C / MoO3 modified electrode. The NiFe (at) C / MoO3 composite material comprises a NiFe (at) C framework and MoO3 loaded on the NiFe (at) C framework, and the NiFe (at) C framework is formed by embedding NiFe bimetal nanoparticles into a porous carbon framework. The preparation method comprises the steps of synthesis of MoO3, synthesis of NiFe C, preparation of the modified electrode and preparation of the electrochemical sensor. The hexachlorophenol electrochemical sensor disclosed by the invention can be used for direct electrochemical detection without derivatization, and is high in selectivity, portable at low cost, ultrahigh in sensitivity and good in application prospect.

The invention discloses an electrochemical urine biopsy system for cathepsin B analysis and a detection method of the electrochemical urine biopsy system. The electrochemical urine biopsy system comprises gold nanoparticles AuNPs, a peptide-peptide nucleic acid PNA series probe and an electrochemical sensor. The peptide-peptide nucleic acid tandem probe is combined with gold nanoparticles through a mercaptan modified sequence to form a spherical nanostructure with the diameter of 15 nm, a polypeptide substrate sequence serves as a specific reaction substrate of cathepsin B, and PNA provides stability and a signal shielding function. The electrochemical sensor is based on a cutting enzyme-assisted DNAwalker mechanism, signal amplification is started through methylene blue MB release, and high-sensitivity detection of the released PNA probe is achieved. The system provided by the invention has the characteristics of high specificity, high sensitivity and rapid response, can realize quantitative analysis of cathepsin B through noninvasive urine biopsy, and provides a new technical means for early diagnosis and treatment monitoring of tumors.

Readings may be received from a chemical sensor disposed proximate to a battery within a housing of a smart-home device. The readings from the chemical sensor may be processed to determine whether a chemical associated with an internal environment of the battery is present inside the smart-home device. A determination may then be made as to whether the battery is damaged based on whether the chemical is present inside the smart-home device. Alternatively, the device may determine that the chemical originates from outside of the housing of the device. A sequence of mitigation actions may then be executed to remedy the faulty battery or improve the indoor air quality.

The invention belongs to the technical field of electrochemical detection, and discloses an anti-pollution electrochemical saliva sensor based on fluorinated side chain polypeptide as well as a preparation method and application of the anti-pollution electrochemical saliva sensor. The fluorinated side chain polypeptide disclosed by the invention not only has excellent hydrophilicity, can form a dense hydration layer with water molecules to repel pollutants, but also has low surface energy, and the interaction between the pollutants and an interface is remarkably reduced. Through the synergistic effect, the fluorinated side chain polypeptide has better anti-pollution performance compared with traditional zwitterionic polypeptide. The anti-pollution electrochemical sensor constructed on the basis of the fluorinated side chain polypeptide can be used for directly detecting CA15-3 in saliva, the saliva does not need to be pretreated, and the detection accuracy can be comparable with that of a commercial ELISA (Enzyme-Linked Immunosorbent Assay) method.

The invention relates to the technical field of bridge health monitoring, in particular to a bridge support corrosion current field imaging monitoring method and system, and the method comprises the steps: presetting a matrix type electrochemical sensor on a support steel plate, and collecting the inductance data of a collector at a sampling frequency of 0.1-0.5 Hz; ohmic resistance drift caused by temperature is eliminated through adaptive quantum Kalman filtering, and a resistance-current density distribution diagram is constructed; constructing a current density distribution diagram of the cross section of the support by adopting a back propagation electrical impedance tomography technology; when the corrosion rate exceeds 0.15 mm / year, an early warning system is triggered, the bearing capacity attenuation rate of the support is calculated, and the support is guided to be replaced; a topological separation technology of a multi-dimensional state space and quantum heuristic adaptive parameter optimization effectively eliminate temperature interference; through current field topology reconstruction and multi-source data fusion, the imaging precision is improved; the quantitative relation between the corrosion rate and bearing capacity attenuation of the support is established, and a scientific basis is provided for bridge maintenance.

The present invention provides a homocysteine ​​electrochemical sensor, and its preparation method and application. The preparation method of the homocysteine ​​electrochemical sensor of the present invention comprises the following steps: adding a dispersion containing carbon nanomaterials to the surface of a glassy carbon electrode, baking and drying, to obtain a carbon nanomaterial-modified electrode; then placing the carbon nanomaterial-modified electrode in a gold salt aqueous solution, and using an electroplating method to deposit nanogold on the surface of the carbon nanomaterial-modified electrode, to obtain a homocysteine ​​electrochemical sensor; the high conductivity of gold nanoparticles is of great significance for improving the electrocatalytic performance of the composite material for homocysteine. The homocysteine ​​electrochemical sensor prepared by the present application has low cost, low detection limit, and good stability. In addition, the spiked recovery rate of homocysteine ​​in serum samples is good, which provides potential application value for the reliable determination of homocysteine ​​in biological systems and the study of homocysteine-related diseases.

The invention relates to an underwater robot target detection method based on multi-sensor information fusion, and the method comprises the steps: obtaining the sonar echo, visual image, surrounding water temperature and chemical information of a target through the sonar, visual, temperature and chemical sensors of an underwater robot, adding a timestamp to each piece of information, aligning the information to a unified time axis through an interpolation method, and carrying out the detection of the target. Extracting sensor feature information of the target, fusing the sensor information based on a credibility model, adjusting the credibility of each sensor in real time, performing similarity matching on the fused feature information and a target feature library to identify a potential target object, and within a confirmed target potential range, identifying the target in the target potential range. A probability density function detection algorithm is adopted to judge the existence of a target, temperature and chemical sensor feature information are combined, and a support vector machine algorithm is used to determine the type of the target, so that the problems that the underwater target is relatively high in similarity with the surrounding environment during detection, the features are not obvious enough and accurate detection is difficult are solved.

The invention discloses an anionic surfactant and a preparation method and application thereof.The anionic surfactant has a double-wedge-shaped molecular structure, alkaline earth metal benzene sulfonate serves as a polar hydrophilic wedge tip, a long-chain alkoxy flexible chain segment serves as a hydrophobic wedge group, the surface tension of water can be remarkably reduced in an aqueous solution, and the anionic surfactant has excellent emulsifying capacity. The molecular structure is based on alkaline earth metal benzene sulfonate and has good thermotropic and lyotropic liquid crystallinity, the liquid crystal phase temperature range of the molecular structure exceeds 140 DEG C, and the phase transition temperature and the mesogenic state temperature range can be controlled by adjusting the number of carbon atoms of an alkoxy substituent. When in a mesogenic state, the molecules can form a supramolecular columnar phase through self-assembly aggregation, and the columnar structure can form a transmission channel with ion recognition in the column center direction. By utilizing the characteristic, a novel bionic ion selective conduction membrane can be constructed, and the biomimetic ion selective conduction membrane has wide application potential in the aspects of preparation of ion selective electrodes and chemical sensors and the like.

The invention discloses a rhizoma polygonati polysaccharide rapid detection electrochemical sensor as well as a preparation method and application thereof, and relates to the field of electrochemical sensors. The method comprises the following steps: (1) preparing an AC-COOH-PANI composite material; (2) preparing an AC-COOH-PANI (at) GCE modified electrode; and (3) preparing the MIP-AC-COOH-PANI (at) GCE. According to the present invention, Glu is adopted as a template molecule, MAA is adopted as a functional monomer, a molecularly imprinted polymer film is constructed on the surface of an AC-COOH-PANI composite material modified GCE electrode through a self-assembly polymerization technology, and the molecularly imprinted electrochemical sensor MIP-AC-COOH-PANI (at) GCE for rapid detection of polygonatum sibiricum polysaccharide is developed, the sensor shows relatively low detection limit, relatively wide linear range, relatively high sensitivity and good selectivity and stability, and has a good application prospect.

The invention discloses an electrochemical sensor and a wearable glucometer, and relates to the technical field of sensors, the electrochemical sensor comprises a working electrode, a counter electrode and a substrate, the working electrode and the counter electrode are both arranged on the substrate, and the projection area of the working electrode on the substrate is smaller than the projection area of the counter electrode on the substrate. The invention aims to improve the current signal stability of the electrochemical sensor so as to realize the sensitivity and reliability of detecting glucose in the body fluid of a diabetic patient.

The invention belongs to the field of electroanalytical chemistry / electrochemical sensors, and discloses preparation and application of a molecularly imprinted sensitive membrane modified electrode for perfluorooctane sulfonic acid detection. According to the method, aniline and o-fluoroaniline are selected as bifunctional monomers, PFOS is taken as a template molecule, in-situ electropolymerization is carried out through cyclic voltammetry, and the molecularly imprinted sensitive membrane capable of specifically recognizing PFOS is obtained. According to the invention, o-fluoroaniline is introduced and is combined with a fluorocarbon chain of PFOS through F-F interaction, and due to the existence of fluorine atoms, non-specific combination can be reduced, so that the anti-interference capability of the molecularly imprinted sensitive membrane is stronger, and the selective limitation on a perfluorinated compound composed of a sulfonic acid group and the fluorocarbon chain is reduced; according to the invention, aniline is used as another functional monomer, so that the conductivity can be improved, and the aniline and o-fluoroaniline can be doped and electrically polymerized to form fluorinated polyaniline. And the chemical property of the fluorinated polyaniline is relatively stable, so that the stability of the eluted molecularly imprinted cavity is relatively high.

The invention discloses a field high-sensitivity CO2 concentration detection device and a fault self-diagnosis method thereof.A shell of the device is internally divided into an air inlet chamber, a concentration quantitative control chamber, a two-stage gas mixing chamber and a detection chamber through wallboards, and a CO2 concentration quantitative control assembly capable of adjusting air into the required CO2 concentration is arranged in the concentration quantitative control chamber; the electrochemical CO2 sensor detects compressed air, the temperature sensor detects the temperature of the head of the front end of the cigarette incense for calibration, the rechargeable lighter ignites the cigarette incense for calibration to generate CO2, and the steering engine drives the cutter to cut off the head of the front end of the cigarette incense for calibration; a CO2 concentration calibration value is obtained in the calibration stage, the CO2 concentration of the gas for self-inspection is obtained when self-inspection is executed, the CO2 concentration of the gas for self-inspection is compared with the CO2 concentration calibration value, and whether a fault exists or not is judged; when the detection device works normally, the electrochemical CO2 sensor collects the CO2 concentration of the air to be detected; the CO2 diffusion rate and density are enhanced by using pressure so as to improve the response current of the electrochemical sensor and improve the detection sensitivity.

The invention relates to the technical field of detection, and discloses an MCP image enhancement high-sensitivity detection system, which comprises a photoelectric cathode, which adopts a multi-quantum well structure and a surface plasma enhancement technology, is used for converting incident photons into primary electrons, and comprises a quantum well formed by gallium arsenide and gallium aluminum arsenide; a microchannel plate for amplifying primary electrons generated from the photocathode; the microchannel plate is coated with a superconducting thin film so as to reduce noise and improve electronic gain; various types of sensors include optical sensors, thermal imaging sensors, acoustic sensors, and chemical sensors. By adopting a multi-quantum well structure and a surface plasma enhanced photoelectric cathode, the spectral response and photoelectric conversion efficiency are remarkably improved, and the sensitivity and response speed of the system to non-specific wavelengths are enhanced. Meanwhile, the microchannel plate coated with the superconducting thin film effectively reduces the noise level, improves the signal definition and the image quality, and solves the high-gain limitation of a traditional system.

This invention discloses an electrochemical sensor for neutralizing antibodies applicable to whole blood and its usage method, comprising a foldable drainage region, a reaction region, and an adsorption region. The working electrode of the reaction region is coated with PEDOT:PSS conductive hydrogel material, which is then modified with PEG to immobilize specific biorecognition molecules. This invention's detection device can quickly and efficiently quantify neutralizing antibody concentrations, can be used for whole blood testing, can detect extremely low concentrations, and exhibits high sensitivity and good detection performance.

The application discloses a continuous acquisition and data model construction system and method of an intelligent sensor. In order to overcome the problems that the training data acquisition of the chemical sensor in the prior art is inconsistent with the actual application, the data acquisition efficiency is low, and effective data is insufficient, in the training process, the sensor unit is placed in the test unit, and the concentration control unit is used to adjust the concentration of different samples, so that the data is continuously acquired. In the prediction process, the sensor unit is placed in the sample input unit, is input into the concentration prediction model after correction by the state calibration unit, and the sample concentration output is obtained. The continuous data sampling method is used, the recovery process is not performed, and the balance state is reached in a relatively short time, so that the training time is greatly reduced; the response and recovery stage data are continuously acquired, so that the training data is consistent with the signal and concentration change process in the actual application; in the prediction process, the state of the sensor is dynamically detected and different models are called, so that the model accuracy is improved.

This invention provides a food fraud detection device using terahertz spectroscopy that achieves a compact and stable structural configuration. [Solution] The food fraud detection device 100 using terahertz spectroscopy according to the present invention comprises a base housing 20 and an upright housing 21 attached to the base housing 20. A display unit 1 is provided in the upright housing 21, and a user input unit 2 is provided in the base housing 20. The main body of the device 100 is equipped with a wireless connection antenna 7, a voice generation unit 8, a voice input port 81, first to fourth connection ports 31, 32, 33, 34, an external sensor connection port 4, a server connection port 5, and a port 6 for opening the device. An optical sensor 10, an ultrasonic sensor 11, and a chemical sensor 12 are arranged on the base housing 20 together with corresponding control switches 13, 14, 15.

The present invention relates to a circulating tumor cell detection system and an electrochemical sensor preparation method, which relate to the field of computer vision. The system includes an acquisition module for acquiring cell images using an electrochemical sensor; a segmentation and extraction module for performing segmentation and extraction based on the cell images using a cell image segmentation model to obtain segmentation results; the cell image segmentation model is obtained by training a U-Net network using a transfer learning algorithm; and a Grad-CAM algorithm processing module for obtaining a tumor cell heat map based on the segmentation results using the Grad-CAM algorithm. The present invention can achieve accurate identification of CTCs.

The invention relates to an electrochemical sensor having a porous diaphragm and an electrolyte formulation that comprises at least one solvent, at least one electrolyte from the group of alkali metal salts and at least one alkaline earth metal ion, and to an electrolyte formulation.

The application discloses an electrochemical sensor and a preparation method and application thereof. The electrochemical sensor comprises a three-electrode system composed of a working electrode, a reference electrode and a counter electrode, wherein the working electrode is composed of a base electrode, a molybdenum disulfide nanoparticle modification layer and a polyethylene dioxythiophene layer; the molybdenum disulfide nanoparticles are loaded on the surface of the base electrode through a drop coating method, and the polyethylene dioxythiophene is in-situ loaded on the surface of the molybdenum disulfide nanoparticle modification layer through an electro-polymerization reaction. The electrochemical sensor can be used for detecting lead ions in water bodies, has the advantages of simple preparation, stable performance, suitability for an acidic medium and the like, and is suitable for practical application and popularization.