270results about How to "High test sensitivity" patented technology

The invention relates to impulse response analytical test apparatus and method for detecting deformation of transformer winding, belonging to the technical field of transformer winding detection. The apparatus mainly comprises an impulse generator, a broadband digital oscilloscope, a computer, a high-voltage probe, a head end signal impedance matching device, a tail end signal impedance matching device and a screened coaxial cable. In the method, site test and analysis are carried out by using the apparatus. The invention has the advantages of high test sensitivity, rapid detection, strong capacity of resisting disturbance and flexible analytical method, and can detect slight deformation of the transformer winding and judge early potential faults effectively with high judging accuracy. The invention can be widely applied to the detection of the deformation of the transformer winding and the state overhauling.

A method and apparatus for use in a flow through assay process is disclosed. The method is characterised by a “pre-incubation step” in which the sample which is to be analysed, (typically for the presence of a particular protein), and a detection analyte (typically an antibody bound to colloidal gold or a fluorescent tag) which is known to bind to the particular protein may bind together for a desired period of time. This pre incubation step occurs before the mixture of sample and detection analyte come into contact with a capture analyte bound to a membrane. The provision of the pre-incubation step has the effect of both improving the sensitivity of the assay and reducing the volume of sample required for an assay. An apparatus for carrying out the method is disclosed defining a pre-incubation chamber for receiving the sample and detection analyte having a base defined by a membrane and a second membrane to which a capture analyte is bound. In one version the pre-incubation chamber is supported above the second membrane in one position but can be pushed into contact with the membrane carrying the capture analyte thus permitting fluid transfer from the incubation chamber through the capture membrane. In another version the membrane at the base of the incubation chamber is hydrophobic and its underside contacts the capture membrane and when a wetting agent is applied to the contents of the pre-incubation chamber fluid transfer occurs.

A method and apparatus for use in a flow through assay process is disclosed. The method is characterised by a “pre-incubation step” in which the sample which is to be analysed (typically for the presence of a particular protein), and a detection analyte (typically one or more antibodies bound to colloidal gold or a fluorescent tag) which is known to bind to the particular protein may bind together for a desired period of time. This pre-incubation step occurs before the mixture of sample and detection analyte come into contact with a capture analyte bound to a membrane. The provision of the pre-incubation step has the effect of both improving the sensitivity of the assay and reducing the volume of sample required for an assay. An apparatus for carrying out the method is disclosed defining a pre-incubation chamber for receiving the sample and detection analyte having a base defined by a membrane and a second membrane to which a capture analyte is bound. In one version the pre-incubation chamber is supported above the second membrane in one position but can be pushed into contact with the membrane carrying the capture analyte thus permitting fluid transfer from the incubation chamber through the capture membrane. In another version the membrane at the base of the incubation chamber is hydrophobic and its underside contacts the capture membrane and when a wetting agent is applied to the contents of the pre-incubation chamber fluid transfer occurs.

A tactile sensing garment of intelligent robot consists of garment wearing on intelligent robot and tactile sensing unit set on said garment. It is featured as forming said tactile sensing unit by both top and bottom film electrode plates with each electrode contact being corresponded one by one as well as with one electrode contact being arranged in line array form and another one being arranged in column array mode, sticking a conductive rubber on each electrode contact of bottom film electrode plate and setting a backing strap with holes corresponding to said conductive rubber between two said film electrode plates.

The invention discloses a microscopic Raman imaging spectrum rapid detection apparatus and a method thereof, which belong to the technical field of optical microscopic imaging and spectral measurement. The microscopic Raman imaging spectrum rapid detection apparatus comprises a light source, a multifunctional sample room, a composite optical system, an image acquisition system, a data fusion processing system, a Raman spectrum detection system, and a computer control and display system. According to white light or laser emitted by the light source, sample in-situ observation and microscopic Raman imaging spectrum real-time on-line detection are respectively realized, the data fusion processing system performs real-time analysis processing on images and spectrum information, and images andspectrum information are displayed and output in the computer control and display system. The microscopic Raman imaging spectrum rapid detection apparatus has the characteristics of compact structure,high spatial resolution, convenient usage, and stable performance, can be used in the fields of water quality detection, material analysis, petrochemical engineering, environment monitoring, and industrial precision detection, is convenient for field on-site investigation experiment and on-line test real-time analysis, and has a wide application prospect.

Methods and apparatus for measuring sag properties of a drilling fluid using a rotary viscometer. An insert, or shoe, is placed at the bottom of the heat cup containing the fluid to be tested. A rotating cylinder is disposed within the fluid and solid particles are allowed to settle toward the bottom of the heat cup. The shoe incorporates a curved and inclined upper surface that directs the settled particles toward a well non-centrally located in the shoe. As the test is performed, fluid samples can be withdrawn from the well and analyzed. The samples can then be returned to the well and the test continued. The insert concentrates the settled solids into a single location, which increases the sensitivity of the test and provides a location for sample acquisition that is easily and repeatedly located, which allows for improved correlation with laboratory and flow loop results.

By measuring ultralow moisture permeation through a barrier material sample at a temperature substantially above ambient, definitive values are produced on an accelerated basis that can be used to accurately predict long term daily performance of that barrier material. The sample is heated to a desired test temperature where there is controlled access to both its upstream and downstream surfaces, and HTO vapor is then supplied at predetermined relative humidity to the upstream surface by fracturing a glass ampoule containing not more than 10 millicuries of specific radioactivity for each test. Radioactive gas permeating from the downstream surface is collected by circulating a very slow flow of dry carrier gas past the downstream surface, which stream flows to an ionization chamber containing a beta-particle radiation monitor. Continuous monitoring generates signals that are converted to calculate instantaneous permeation rates through the sample, and operation at such elevated temperature is carried out until the values being monitored reach a steady state, allowing accurate prediction of the extent of long term barrier protection against moisture permeation the sample will exhibit.

The invention provides a device for simulating and measuring a heat flux of continuous casting covering slag, and the device comprises a heat flux emission system, a copper mould crystallizer, a power control system, a data acquisition/computer control system and a digital imaging system, wherein one end of the power control system is connected with the heat flux emission system and the other end of the power control system is connected with the data acquisition/computer control system; the copper mould crystallizer is placed below the heat flux emission system; and the digital imaging system is arranged beside the copper mould crystallizer. According to the invention, by virtue of comprehensively simulating a working condition and approaching to an actual production, the heat flux under instantaneous and stable conditions of the covering slag can be measured, and the size of the interface heat resistance between a slag film and a copper mould can be measured; and meanwhile, the thickness of the covering slag is accurate and controllable. Heat flux measuring equipment has the functions of controllable input heat flux waveform/amplitude and high testing flexibility; and the device has the advantages of good test repeatability, low equipment investment and maintenance cost, convenience for operation, stability, reliability, unique and novel structure, convenience for preparing test samples and low manufacturing cost, so that the device is novel heat flux measuring equipment.

The present invention provides a reagent kit which is used for measuring a test substance in a biological sample and can improve measurement sensitivity of the test substance; measurement kit; and a method of measuring the test substance. Provided is a reagent kit which is used for measuring the above-described test substance in the biological sample and contains first particles which are modified by a first binding substance having specific binding properties with respect to the test substance and have a label, and a compound which has at least one amino group having a positive charge.

The invention discloses an enrichment analysis instrument of carbon and nitrogen of the greenhouse gases of CO2 and N2O. A greenhouse gas sample collected by a sampling tube is led through a sample guiding valve under the He gas, is dehydrated by an electron cold trap, undergoes enrichment and transferring in a liquid nitrogen cold trap, undergoes separation by a chromatographic column and dehydrating by a water trap and is led into a gas isotope mass spectrometer through an opened shunting port for being detected. The enrichment analysis instrument has the port which is directly connected with an isotope mass spectrometer mainframe, is an independent accessory device of the isotope mass spectrometer and carries out assay determination on isotope abundance of the carbon and the nitrogen of the greenhouse gases of CO2 and the N2O which are greenhouse gases at the same time. The gas is transferred from a cold trap T1 to a cold trap T2 through conversion of gas-carrying flow and by changing a freezing state of the target gas in the traps. Meanwhile, other impurity gases which are captured by a freezing gas are released and thus, good chromatographic peak shapes and higher purity of the sample are achieved and the testing precision is improved.

The invention discloses a test structure for measuring the thermal conductivity of a film, which comprises a substrate and an insulating layer arranged on the substrate, wherein a test unit is arranged on the insulating layer, and the test unit comprises a reference unit and a test unit. The structure has simple preparation process and convenient test and is particularly suitable for measuring the thermal conductivity of a silicon nitride (Si3N4) film in a natural air environment. An S-shaped heater made of platinum (Pt) is adopted and can achieve more uniform heating temperature and reduce temperature error, and moreover, the S-shaped heater has higher test precision.

The invention relates to a distributed crack sensor based on a coaxial cable, belonging to the technical field of an engineering structure safety monitoring. The distributed crack sensor provided by the invention is characterized in that a metal conductor core on the inner layer, an insulating layer in the middle, the metal conductor layer provided with a weak link (such as sunk weak threads, dot mode weak threads and the like) and a surface anticorrosive material are sequentially arranged from inside to outside; the weak threads are machined by applying the rotation advancing traction to the coaxial cable and simultaneously utilizing a drill to carve grooves on an outer conductor layer or utilizing a puncher to continuously punch on the outer conductor layer; the depth and pitch of the weak threads select different numerical values according to the requirements of the structure on the test sensitivity and the space resolution; and when cracks are monitored, the attenuation signals which are generated because of the crack modulation of the coaxial cable are obtained through an electric time domain reflectometer to determine the occurrence position and expansion degree of the cracks. The sensor provided by the invention has the beneficial effects that the sensor is a coaxial cable distributed crack sensor provided with weak threads, the structure is simple, the durability is good, the crack monitoring scale is large, and a structural damage memory function is achieved.

The invention relates to a gold nanoparticle-molybdenum disulfide-gold ultra-sensitive SERS substrate material and a preparation method thereof. The structure is a gold nanoparticle/molybdenum disulfide/gold sandwich structure with the gold nanoparticle as a core, the molybdenum disulfide as a shell, and a layer of gold particles with a certain "hot sopt" effects evaporated on the surface of the core-shell structure in a vacuum mode. The molar ratio of the nano-material element is molybdenum: sulfur: gold being 1.0:1.9: 1.0. The chemical formula of molybdenum disulfide is MoS2. Compared with the prior art, the preparation method of the gold nanoparticle-molybdenum disulfide-gold ultra-sensitive SERS substrate material is convenient and fast. According to the gold nanoparticle-molybdenum disulfide-gold SERS substrate material, MoS2 serves as a supporting body to adsorb target molecules, a double-plasma coupling effect exists between the Au nano particles, the "hot spot" effect enhancedan SERS signal, the MoS2 is in bridge connection with the Au so as to realize the ultra-sensitive detection of rhodamine B molecules, the detection limit can reach 10-10 mol/L, and the repeatability and the stability of the rhodamine B is detected to be good.

The invention relates to a full-automatic fecal occult blood analyzer, and belongs to measurement devices used for immunization test. The analyzer comprises a main case, an upper cover, a reaction disc component, a sample disc component, a reagent loading bracket, a probe component, a mechanical arm component and a base plate, wherein the probe component and the mechanical arm component are connected with the base plate respectively. The full-automatic fecal occult blood analyzer has the advantages that the full-automatic sample detection can be realized, the test velocity is fast, the possibility that a tester comes into contact with the sample is lowered, so that the environmental protection is facilitated and the hemoglobin concentration in excrement can be measured quantitatively.

The invention specifically relates to a system for measuring micro vibration by using a femtosecond laser based on balanced optical cross-correlation and a micro vibration measuring method, and belongs to the field of photoelectric precision measurement. The system comprises a microwave atomic clock, an optical fiber femtosecond laser, servo control equipment, data acquisition equipment, an upper computer and an optical measurement assembly. The basic principle of the system is a balanced optical cross-correlation principle. Femtosecond pulses emitted by the locked femtosecond laser pass through the optical measurement assembly, the data acquisition equipment acquires optical signals, output signals respectively get into the servo control equipment and computer processing equipment, the servo control equipment controls the repetition frequency of the laser, and the computer outputs a measurement result in real time. The greatest advantage of the method lies in that the method is sensitive in measurement and simple in data processing, and the method is mainly used for realizing high-precision micro vibration measurement in real time. The system and the method provided by the invention can be applied to measurement for one-dimensional micro vibration signals and calibration for a micro vibration sensor, and can also be used for manufacturing vibration measurement instrument and equipment and the like.

In general, the invention features multiplexed devices, systems, methods, and kits for analysis of cells, particles, and other analytes on a porous membrane. Preferred devices detect, identify and quantify low levels of microorganisms in complex biological samples, such as blood. An exemplary device includes a housing having a fluid inlet that is in fluid communication with a plurality of channels, e.g., having substantially the same fluidic resistance. Each of the plurality of channels is in fluid communication with a reservoir containing reagents for analyzing cells, particles, or other analytes bound to particles, one or more substantially planar, porous membranes through which the cells or particles do not pass, and one or more outlets, wherein liquid flowing away from the inlet is divided between the plurality of channels and flows through the one or more membranes towards the outlet, and wherein the reservoir is disposed upstream of the one or more membranes.

The invention relates to a device and a method for generator rotor winding turn-to-turn insulation fault diagnosis. The device is used for detecting a rotor winding, and comprises a signal generator and a data acquisition card electrically connected with two ends of the rotor winding respectively, wherein the data acquisition card is also in communication connection with a computer; the signal generator sends an excitation signal to the rotor winding; the data acquisition card receives a feedback signal and sends the signal to the computer; and the computer deduces the fault of the rotor winding according to the feedback signal. Thus, the operation process is simple, convenient and reliable, and the test efficiency and the test accuracy for the generator rotor winding turn-to-turn insulation fault diagnosis can be improved.

The invention provides a high-durability fiber grating scouring sensor which comprises a metal shell and a measuring part arranged in the metal shell and connected with the metal shell, wherein the measuring part is composed of a FRP uniform strength beam and two fiber gratings stuck on the upper and lower surfaces of the FRP uniform strength beam, the leading-out wire of the fiber grating passes through the metal shell and is educed, the inner wall of the metal shell is provided with a metal baffle plate provided with a calcium carbide, the lower part of the metal shell is provided with a dowel bar, a prepressing small-rigidity spring is arranged between one end of the dowel bar and the inner wall of the metal shell, and the other end of the dowel bar is provided with a FRP disc. The scouring sensor has the advantages of the high precision, the convenient arrangement and the adjustable range and resolution, and is applied to the foundation soil scouring monitoring of health monitoring of civil engineering structure and the foundation soil scouring monitoring of structural test.

The invention provides a non-contact life sign monitoring signal processing system, comprising an I/Q channel signal processing module, a respiration frequency estimation module, a modulation component removing module and a heartbeat frequency estimation module, wherein the I/Q channel signal processing module is used for combining I/Q channel signals I(t) and Q(t) into a complex signal S(t); the respiration frequency estimation module is used for defining a frequency rotation operator according to the baseband signal mathematic model characteristic, multiplying S(t) by, performing Fourier transformation, performing optimizing estimation on a parameter P by the spectrum concentrated index, and estimating firstly to obtain respiration frequency fr; the modulation component removing module is used for multiplying S(t) by the frequency rotation operator estimated in the step 2 and removing the modulation component caused by respiration in S(t); and the heartbeat frequency estimation module is used for estimating the heartbeat frequency fh. According to the non-contact life sign monitoring signal processing system provided by the invention, the matched frequency rotation operators are constructed based on a radar baseband signal model to perform parameterization optimizing estimation, and high-precision fr and fh estimation values can be obtained by short sampling length data, so the test sensitivity and the noise resistance are high.

The invention discloses a high-sensitivity gas sensor based on a microchannel plate three-dimensional structure and a production method of the high-sensitivity gas sensor. The high-sensitivity gas sensor consists of a detection module and a heating module; the detection module is bonded with the heating module through an electrically-conductive sizing agent; the detection module and the heating module are respectively provided with two lead leading-out electrodes, i.e. a detection electrode and a heating electrode, the detection module and the heating module are packaged inside a packaging tube shell, and the packaging tube shell is provided with at least four electrodes; the detection module is sequentially formed by an upper electrode, a microchannel plate and a lower electrode from top to bottom; the heating module is sequentially formed by a heat insulation substrate, a heating resistance coil and an insulation film from bottom to top. The high-sensitivity gas sensor has the beneficial effects that the effective specific surface area of a gas-sensitivity film can be improved, so that the sensitivity of the gas sensor can be improved; the porous structure of the microchannel plate favors the successful passing of detected gas, so that the test sensitivity and reaction speed of a device can be improved.

The invention discloses a thick loose rock-soil layer bottom water injection sedimentation deformation analog device and method. The thick loose rock-soil layer bottom water injection sedimentation deformation analog device is characterized in that the two ends of a model barrel of the device are connected to flanges, and the two sides of the model barrel are connected to a water drainage flange and a pressure measuring pipe; a constant-pressure water injection pump is connected to a water source, the other end of the constant-pressure water injection pump is connected to a flowmeter, the other end of the flowmeter is connected to a water injection pipe which is connected to a water injection floral pipe in the model barrel, the bottom of a cavity is connected to a perforated plate, an optical cable is connected to a fiber grating sensor, and the other end of the optical cable is connected to a fiber grating demodulator, a computer and remote transmission equipment. The sedimentation analog method comprises the steps that the constant-pressure water injection pump is used for injecting water so as to cause the sedimentation and the deformation of a thick loose rock-soil layer, a light source in the demodulator is applied to the sensor, the demodulator is used for converting an optical signal returned by the sensor into a wavelength value and sending the wavelength value to the computer, the wavelength drift distance is calculated, and the wavelength value is converted into an internal stress value of the thick loose rock-soil layer. The thick loose rock-soil layer bottom water injection sedimentation deformation analog device has the advantages of being complete in monitoring, high in testing flexibility, repeated in manufacturing and wide in suitability for the research of a sedimentation problem of coal mines, foundation ditches, side slope roads and railways, and the wireless data transmission can be realized.

The invention discloses an infrared optical fiber for detecting sulfur hexafluoride gas and a preparation method thereof. Monocrystalline Si is used as the substrate of the infrared optical filter; Ge is used as a high-index material; and ZnS is used as a low-index material. A main film system surface film and an interference cutoff film system surface film are respectively deposited on two surfaces of the substrate. A film plating process is characterized in that electron beam evaporation of Ge is performed, and the deposition rate is 8 angstroms/sec; porous molybdenum boat electrothermal evaporation of ZnS is performed, and the deposition rate is 20 angstroms/sec; and when evaporation is started, the vacuum degree is 1.0*10<3>Pa and the deposition temperature is 130 DEG C. According to the infrared optical filter for detecting the sulfur hexafluoride gas and a 10560nm bandpass infrared optical filter obtained through the preparation method, a peak transmittance can reach above 90%; a signal-to-noise ratio is greatly improved; an interference by other gases can be well inhibited; and detecting precision and detecting efficiency of an instrument are improved.