341results about How to "Measurement results are stable" patented technology

The invention relates to a sensing method with an optical-fiber Bragg grating laser device. An optical-fiber Bragg grating is used as a reflector of the resonant cavity, an active optical fiber capable of generating sufficient gains is added, and a double wavelength/multiple wavelength optical-fiber Bragg grating laser device is formed under the action of a pump light source and used as a sensor. When the outside strain, temperature and other physical quantities act on the sensing system, the beat signal frequency among the double wavelength or multiple wavelength laser can shift, and counter stress, temperature and other physical parameters can be measured precisely by detecting the beat signal frequency information. The invention has the advantages of simple manufacture, stable and reliable operation, stable measurement result and high precision, and is free from the interference of light intensity, polarization and other optical information quantities. The multipoint distribution sensing measurement can be realized in a frequency-division multiplexing mode. An electrooptical modulator is added before the spectrum analyzer starts detection so as to randomly adjust the beat signal frequency, thereby greatly reducing the spectral range of the spectrum analyzer and reducing the detection cost.

The invention discloses a continuous variable-angle digital holographic metrology method and a continuous variable-angle digital holographic metrology device for complicated face type and belongs to the technical field of photoelectric measurement. The device comprises a laser, an optical fiber beam splitter, an optical fiber phase shifter, a precision angle deflection device, an off-axis paraboloid calibrator, a collimating lens group, a light combining prism, an optical fiber, a charge coupled device (CCD) camera, a computer and the like. The invention is characterized in that a precision angle deflection structure in a system can precisely change the direction of reference light in a multi-angle mode; when an angle is changed, a hologram which is generated by interference of the reference light and object light can be changed; and a wrapped phase value of an object at each angle is obtained by controlling the optical fiber phase shifter and using a phase shifting method; cosines of the wrapped phase values are added to obtain a function, and peak search is performed, so the height information of each point of the object can be obtained. The invention has the advantages that all points of the object to be measured are separately measured in the measurement process, a phase unwrapping step is eliminated, and face type parameters of the object which has complicated shape and is interrupted can be measured.

An image processing sensor includes an image-group acquiring unit configured to acquire a plurality of non-defective product candidate images and a plurality of background candidate images, a differential-image generating unit configured to generate a non-defective product-background differential candidate image from a non-defective candidate image and a background candidate image acquired under the same brightness condition candidate among the plurality of brightness condition candidates, a matching-degree calculating unit configured to respectively calculate matching degrees of the background candidate image with respect to pattern models corresponding to non-defective product-background differential candidate images generated for each of the plurality of brightness condition candidates, and a brightness-condition selecting unit configured to select one brightness condition out of the plurality of brightness condition candidates according to a selection condition on the basis of the matching degrees calculated for each of the plurality of brightness condition candidates.

Pretreatment of residual food removal and bacteria dyeing, and measurement of the number of bacteria using the fluorescence flow cytometry method, are stably performed by easy operations.

A measurement chip 10 includes: a specimen container 151; a reaction container 170 for mixing a specimen and a dyeing reagent into a liquid mixture; a bacteria detection portion 18 being irradiated with excitation light; a detection liquid waste container 163 into which liquid mixture which has passed the bacteria detection portion enters; a solution flow path 157 which connects the specimen container, the reaction container and the bacteria detection portion, and ventilation ports 1631 through 1633 which are connected to the specimen container, the reaction container and the detection liquid waste container, through a air flow path and is connected to a chip connecting tube. Bacteria are detected in the bacteria detection portion 18 by switching of the states of the specimen container, the reaction container, and the detection liquid waste container between a sealed state and a state open to the atmospheric pressure, by moving the specimen to the reaction container 170 to mix and stir the specimen and the dyeing reagent, and by moving of the liquid mixture to the detection liquid waste container 163.

The invention discloses a measurement method of concrete resistivity and a device thereof. The measurement method comprises the following steps: a. arranging an electrode respectively at two ends of the concrete to be detected; b. applying direct current of a steady state value between the above two electrodes, measuring the electric potential between the electrodes and recording as energization electric potential; c. disconnecting the direct current applied on the electrodes, measuring the electric potential between electrodes in short enough time and recording as interruption electric potential; d. changing the value of the applied direct current value of a steady state value, repeating the steps of b and c for 0 to 50 times; and e. calculating the concrete resistivity according to the energization electric potential and the interruption electric potential measured in the above steps. The measurement method and device can directly measure the concrete resistivity without destroying the surface structure of the concrete to be detected, the measuring result is stable, the measurement method is rapid and accurate and the measuring instrument is easy to operate.

The present invention provides an unbalanced polarization maintaining fiber dual-interferometer temperature strain simultaneous measurement device and method. A polarization-maintaining fiber coupler,a phase modulator, a polarization-maintaining fiber and a polarization-maintaining fiber reflector form an unbalanced polarization-maintaining fiber interferometer. A light source injects light intoa fast axis and a slow axis through a polarizer at the same time for transmission, coaxial transmission signal interference is achieved in the interferometer, interference signals are detected by a polarization beam splitting difference detection device formed by a polarization-maintaining circulator, a polarization beam splitter and a photoelectric detector, and finally, a signal collection and demodulation and record device processes the interference signals. Parameters of the fast axis and the slow axis of the polarization maintaining fiber are different to allow fast-axis signals and slow-axis signals to have different responses for the same temperature and the same strain, and an unbalanced interferometer structure is employed to construct an orthogonal response matrix and measure temperature response coefficients and strain response coefficients of two paths of interference signals to achieve simultaneous measurement of temperatures and strains. The unbalanced polarization maintaining fiber dual-interferometer temperature strain simultaneous measurement device and method solve the intersection sensitivity problem, the measurement result is accurate and stable, and the sensitivity is high.

The invention discloses a method for analyzing and detecting alloying elements in a beryllium-aluminum alloy. The method comprises the following steps: weighing a beryllium-aluminum alloy sample to be detected and 20% sodium hydroxide solution in the mass ratio of (0.1 to 5): 100, and putting into a polytetrafluoroethylene plastic beaker; dissolving at a low temperature; oxidizing by adding 30% hydrogen peroxide in a small amount drop by drop, and decomposing excessive hydrogen peroxide by heating after oxidizing; cooling to obtain a mixed solution; weighing the mixed solution, 50% hydrochloric acid and 50% nitric acid in the volume ratio of (5 to 10): (30 to 50): (10 to 20); acidizing and heating until the solution is absolutely clear; cooling and diluting the solution to the required volume with water; shaking the solution up to obtain the beryllium-aluminum alloy sample solution to be detected; then, plotting standard working curves; and finally detecting the samples. The method for analyzing and detecting alloying elements in a beryllium-aluminum alloy in the invention solves the problems of the determination of silver with higher content in the beryllium-aluminum alloy material and the influence thereof on other elements to be detected in the material in the analysis and detection using plasma emission spectra.

The present invention discloses a switching device and a measurement system for the tongue-and-groove measurement of a turbine disc. The system comprises an adapter and a positioning block arranged on the adapter. The adapter comprises a body and a tenon tooth shaft in sliding fit with the body along the axial direction of the body. The tenon tooth shaft is embedded in the body. Both the bottom end of the body, and the end portion of the tenon tooth shaft which extends out of the body, are provided with tenons. The molded surfaces of tenons, formed on the body and the tenon tooth shaft, are matched with each other and combined together to form an adapter tenon matched with a tongue-and-groove on the turbine disc. The dimension of the adapter tenon is smaller than the dimension of the tongue-and-groove, so that an assembly clearance is provided. An elastic mechanism for realizing the elastic buffer of the axial displacement is sleeved onto the tenon tooth shaft. The top end of the tenon tooth shaft is provided with a locking mechanism used for locking the tenon tooth shaft along the axial direction. For the measurement of the complex molded surface of a tree-shaped tongue-and-groove, a combined structure of the body and the tenon tooth shaft is designed. In this way, not only the assembly clearance for the cooperation of the adapter tenon with the tree-shaped tongue-and-groove on the turbine disc is provided, but also the adapter tenon is reliably positioned. Meanwhile, the measurement result is stable, and the measurement mode is simple and convenient to operate.

The invention discloses a comprehensive analysis system for xerophthalmia. The comprehensive analysis system comprises an imaging system, an analyzing system and a video terminal, wherein the imaging system comprises a lighting source, an imaging assembly, a control panel and a camera shooting module, the lighting source penetrates through the imaging assembly and irradiates the eyes of a patient, and the camera shooting module carries out imaging on the eyes of the patient, and transmits the generated image to a PC machine through a USB interface; the analyzing system is arranged at the PC machine end, and comprises a communication module, an image data collecting module, a tear film breakup time check module, a lacrimal rivus height measuring module, a meibomian gland image collecting and enhancing module, a lipid layer analyzing module, a data analyzing module and an information management output module; the video terminal is connected with the analyzing system. With the comprehensive analysis system for xerophthalmia provided by the invention, the functions of tear film breakup time statistics checking, lacrimal rivus height measurement, meibomian gland image collection and enhancement, human eye lipid layer analysis, and the like are realized, a basis is provided for the clinical diagnosis for xerophthalmia, and the comprehensive analysis system is applied to the medical treatment in the relevant fields of clinical diagnosis of the ophtalmology department.

The invention discloses a hydrobiontic algae chlorophyll measuring method which consists of, using spectrophotometry method to measure the algae chlorophyll content in the water, filtering subaqueous algae with cellulose acetate microporous filtering film, carrying out interception to the algae cellulose acetate through immersion with 90% ethanol, extracting the chlorophyll in algae cell into ethanol, centrifuging the tobacco extract to obtain the clarified solution, using 90% ethanol as reference, determining absorbancy of the tobacco extract at 630, 647, 664 and 750 nm with a spectrophotometer, calculating content of chlorophyll a, b, c in the water sample by utilizing the measured data.

The invention discloses a method for measuring titanium content in iron-bearing material and blast furnace slag, which comprises the following steps of: preparing a titanium standard working sample solution, drawing a working curve, preparing a mother solution, and then, measuring the titanium content. By adopting the technical scheme, with the improvement of the method prescribed by the standard GB6730.22 through a large number of experiments on the basis of GB6730.22 and the combination of the traditional sample processing method, a method for accurately and quickly analyzing and measuring the titanium content is developed. The experimental verification indicates that: satisfactory effects are obtained, measuring results are accurate and stable, the steps are simplified and the work efficiency of analysis of chemical components is improved.

The invention discloses a simultaneous determination method for nicotine, 1,2-propylene glycol and glycerol in electronic cigarette smoke. The method comprises the following steps: smoking an electronic cigarette according to a smoking scheme; capturing the smoke by using a glass fiber filter; after extraction oscillation is performed on the fiber filter by adopting internal standard-containing organic solution, taking 1mL of solution in a 2mL chromatogram bottle; detecting extracted solution through a gas chromatography-hydrogen flame detector. According to the method, a DB-ALC1 (30m*0.32mm*1.8 mum) chromatographic column is adopted, so simultaneous analysis of high-concentration 1,2-propylene glycol and glycerol and low-concentration nicotine in the electronic cigarette smoke can be simultaneously analyzed; the internal diameter of the chromatographic column is 0.32 mm; feed detection of the high-concentration 1,2-propylene glycol and glycerol in the extracted solution is not overloaded; meanwhile the chromatographic peak tailing phenomenon of the 1,2-propylene glycol and glycerol with high polarity can be effectively improved by using the 1.8 mum thick liquid membrane column, so the quantification is more accurate.

The invention discloses a method for testing the ground sampling distance of a high-accuracy remote sensing satellite based on a target. The method comprises the following steps of: (1) laying a sector-shaped radial target and guaranteeing that the target can detect the two directions of a vertical rail and an edge rail simultaneously; (2) arranging a satellite to form an image, analyzing the imaging data of the target, and calculating the ground sampling distance according to the actual imaging effect of the target: (2.1) determining a position o (x0, y0) of the center of the sector-shaped radial target at the image of the satellite; (2.2) determining a pixel coordinate (x, y) of the right sampling point; (2.3) calculating a mean value of the distances from all outer-edge mark points to the center of the sector-shaped radial target and a distance L from the origin of a sector shape to the right sampling point line or row; and (2.4) according to the radius of the sector-shaped radial target and a side-swaying angle a of the satellite, determining the ground sampling distance R of the high-accuracy remote sensing satellite in the two directions of the vertical rail and the edge rail.

The invention provides self-powered multifunctional piezoelectric intelligent aggregates for an asphalt pavement, and belongs to the field of health monitoring of asphalt pavements. According to the self-powered multifunctional piezoelectric intelligent aggregates for the asphalt pavement in the invention, the modulus after epoxy resin is cured is approximately equal to the asphalt pavement; the piezoelectric intelligent aggregates encapsulated by the epoxy resin 6200A have a certain strength and durability; the piezoelectric intelligent aggregates have good coupling performance with the pavement, and can be used in the asphalt pavement for a long time; furthermore, the piezoelectric intelligent aggregates do not influence the pavement performance of the pavement; micro-fracture damage monitoring can be carried out in the asphalt pavement; furthermore, an encapsulation container is prepared from the epoxy resin 6200A, a curing agent and quartz powder together; the encapsulation container has high surface hardness and resists corrosion, aging and hot and cold impact; due to encapsulation protection, influence of factors, such as the temperature and the humidity, on a signal measurement result can be weakened or eliminated; interference of an external environment on driving signals and sensing signals can be effectively overcome; therefore, a measurement result is relatively accurate; and simultaneously, the self-powered multifunctional piezoelectric intelligent aggregates in the invention are low cost, simple in structure and steady in performance, and can be widely used inthe asphalt pavement.

The invention discloses a power battery discharge power conversion factor measurement method which is accurate in result and simple. The method comprises the following steps: first discharging a fully-charged single battery to a discharge end voltage at a C/3 rate and a constant current under a standard stipulation condition, and obtaining a standard discharge electric quantity QSD in a calculation manner; performing the constant-current discharge at different currents I in a same way, and obtaining the discharge electric quantity value QID of the battery at different currents I by virtue of calculation; fitting various different discharge currents I and the corresponding discharge electric quantity conversion factor KID=fID(I). The invention also provides an SOC variation measurement method when in discharge of a power battery which is accurate in test, simple and easy. The electric quantity of the power battery discharged at the current I is converted to the release electric quantity QZ=xif ID(I)Idt discharged at the C/3 rate; when the power battery is discharged, SOC variation delta SOC=QZ/Qn, and Qn is a quoted capacity.

The invention discloses a clenbuterol matrix standard substance and a preparation method thereof. The preparation method comprises the following steps of: uniformly mixing pig urine in which a solid substance is removed; then adding a clenbuterol standard substance to a quantity value level; uniformly mixing to obtain a mixed solution; and carrying out uniformity check on the mixed solution and then carrying out subpacking and freeze drying to obtain the clenbuterol matrix standard substance. The preparation method disclosed by the invention is scientific and reasonable and is strong in operability; the prepared matrix standard substance can be stored under the condition of -20DEGC and provides a quantity value tracing substance for detecting clenbuterol residue in daily pig urine; and according to the prepared matrix standard substance, the problem that different detection results are caused by matrix difference is solved and the monitoring of the clenbuterol residue in pig products is accurately ensured.

The invention discloses a method for determining the content of saffron in a medicinal composition, and aims to solve the problem that the content of saffron in a complex medicinal composition is difficult to determine. According to the method, methanol-acetonitrile-0.05mol/L ammonium acetate in a volume ratio of (30-45):5:(50-65) is adopted as a mobile phase, and a high performance liquid chromatography is adopted for determination; the mobile phase is a multi-solvent system, the mobile phase system is kept to be stable by adopting buffer salt, and the elution power is reinforced. The method provided by the invention is stable in determination result and good in linearity, the correlation coefficient, the resolution and the number of theoretical plates can meet the requirement of measurement standard, and a good detection result can be obtained on the saffron in a medicinal composition with a complex prescription.

The invention relates to a method for determining total iron in vanadium titano-magnetite by using an acid dissolution method. The method comprises the following steps: dissolving a sample with sulfuric acid-phosphate mixed acid; in a hydrochloric acid medium, using stannous chloride to reduce a great amount of ferric iron, using potassium permanganate to oxidize vanadium, using sodium tungstate as an indicator, using titanium trichloride to reduce ferric iron to diatomic iron, oxidizing excessive titanium trichloride with potassium dichromate until tungsten blue fades, using sodium diphenylaminesulfonate as an indicator, and determining the content of iron with potassium dichromate titration. Compared with determination with an alkali fusion method, the method greatly shortens the operating process, saves drugs, reduces human resource cost, and improves the production efficiency; as the potassium permanganate oxidation process is adopted, the interference of vanadium on iron is eliminated, the determination results are stable, and data is accurate.

The invention provides a monitoring device and a monitoring method for a high-voltage busbar of an electric vehicle. A sampling resistance voltage signal is acquired by a current sampling circuit anda sampling resistance, a voltage dividing signal is acquired by a voltage acquisition circuit and a voltage-dividing resistance array, a capacitor voltage signal is acquired by an insulation detectioncircuit, a microprocessor is used for processing the received signals and performing compensation and correction on the signals through a reference source to obtain a busbar current value, a bus voltage value and an insulation resistance value, and finally, the data interaction between the monitoring device and equipment connected with a CAN bus is realized through the CAN bus. The monitoring device and the monitoring method provided by the invention have the benefits that the current, voltage and insulation resistance values of the high-voltage busbar of a battery can be simultaneously, quickly and accurately measured, battery key parameters is provided for a battery management system in real time, and the battery safety protection capability and the remaining electric quantity estimation accuracy are improved.