1372results about How to "Accurate and reliable measurement results" patented technology

The invention relates to high optical spectral image technique without harm to agricultural products. It can reflect the appearance of the agriculture products like color, shape, texture, dimension, scar and son on, and internal features like hardness, protein content and connected with knowledge base and experience of experts to make judgment. It can make quick, accurate, timely judgment of products, controlling the overall production with guarantee of the agriculture quality.

The invention discloses an LED optical parameter comprehensive testing device, belonging to the technical field of optical parameter measurement. The LED optical parameter comprehensive testing device is technically characterized in that one end of a horizontal base provided with a one-dimensional mobile platform is fixedly provided with an arc-shaped clamp provided with a fiber-optic probe and astandard luminosity probe, the other end of the horizontal base is fixedly provided with an arc-shaped light collector consisting of an arc fiber-optic array and a linear array CCD (Charge Coupled Device), and a rotary clamping table for holding an LED to be tested is arranged on the one-dimensional mobile platform; light information acquired by the fiber-optic probe is converted into a spectrum band by a spectrograph and then is sent into a computer, outputs of the standard luminosity probe and the linear array CCD are sent to the computer through the data acquisition unit, the computer performs corresponding processing and operation on measurement data through measurement software to finally obtain the luminescence characteristics of the LED to be tested. According to the invention, theproblem on comprehensively measuring the LED on a single measurement instrument is solved; and the LED optical parameter comprehensive testing device has the characteristics of simplicity for operation, compact structure, fastness for measurement, easiness for realization and the like.

The invention provides a method and device for detecting a polarization extinction ratio of an optical polarizer. The detection method comprises the following steps of: making linear polarized light incident along a principal axis of an optical polarizer to be detected, and obtaining two light signals on two orthogonal optical axes at an outgoing end due to polarization crosstalk; interfering and carrying out photoelectric conversion and data acquisition on interfering light signals to obtain one group of discrete voltage signal values reflecting the interfering light intensity signals; and calculating coupling intensity h at each coupling spot based on a formula (1), and calculating an extinction ratio of the optical polarizer to be detected based on a formula (2). The device sequentially comprises a light source, an isolator module, a polarization module, the optical polarizer to be detected, a projection direction regulating module, an interferometer module, a data acquisition module and a central processor module. The invention has the advantage that the coupling intensity of the coupling spots is detected to induce the polarization extinction ratio, so that the measurement result is accurate. The invention is suitable for various optical polarizers, such as polarization maintaining fibers, polarization maintaining fiber couplers, polarizers and the like and has certain universality.

Some sample of relevant food is estimated by some professionals with their sensory organ or tested through conventional physical and chemical analysis to establish correlative data base. Some other sample is determined with sensor array through carrying the smell of the food to the sensor array reaction chamber via carrier gas, amplifying and filtering the signal from the sensor array, A/D conversion in A/D converter and data processing in computer. The result of computer processing is related with those in the established data base and one knowledge library is obtained through learning forthe determination of truth and quality of tested sample. The said method is fast and simple, needs no pre-treatment of the sample and organic solvent extraction, and has the artificial intelligent identification to unknown sample. The present invention facilitates the physical and chemical analysis of food products.

The invention relates to a fixed burning source emission particulate sampling system, which comprises an off-gas inlet system, a second diluter, a setting house and a sampling system positioned on the lower part of the setting house. It arranges a compressed air system on the first diluter and a sampler outlet with gas flow gauge and a superfluity gas outlet with gas flow adjusting valve on the outlet end; it arranges a dilution air supplying system and a gas flow gauge on the outlet of the second diluter and a plurality of pressure balance holes around the lower part of the setting house.

The invention discloses a fish tenderness hyperspectral detection method based on a characteristic wave band. The detection method comprises the following steps of: firstly, detecting fish tenderness according to the conventional detection method; then, with fish as a sample set, utilizing a near-infrared hyperspectral imager to carry out nondestructive detection on the fish, establishing a multi-element linear regression model of the tenderness and a characteristic wavelength, detecting a fish sample, and calculating the tenderness of fish sample according to the multi-element linear regression model of the tenderness and the characteristic wavelength. The fish tenderness hyperspectral detection method provided by the invention has the advantages that the fish tenderness is rapidly detected in an optimized manner through the characteristic wave band, the time of hyperspectral collection, detection and data analysis is greatly shortened, the detection efficiency is improved, and the fish tenderness hyperspectral detection method really provides theoretical support and research basis for on-line, rapid and nondestructive detection of food quality.

The invention relates to wind tunnel turbulence scale measuring, in particular to an indirect measuring method for hypersonic speed wind tunnel turbulence scale. According to the indirection measuring method for hypersonic speed wind tunnel turbulence scale, a miniature airspeed head is used for measuring pressure pulsation in a hypersonic speed wind tunnel flow field, and then the turbulence scale is indirectly obtained according to relation conversion between pressure pulsation and speed pulsation. The method includes the steps of wind tunnel data collecting and data analyzing. According to wind tunnel data collection process, an adjustable device of the miniature airspeed tube is used for measuring pulsation pressure values at different positions of wind tunnel incoming flows, and other probes are used for measuring other wind tunnel data. According to the data analyzing process, the measured pressure pulsation values and other wind tunnel data are analyzed to obtain the function relation expression between pressure pulsation and speed pulsation in hypersonic speed airflows through deduction, and therefore the hypersonic speed wind tunnel turbulence scale is obtained through calculation. The function relation expression between pressure pulsation and speed pulsation is simple and clear, the hypersonic speed wind tunnel turbulence scale can be obtained only by pressure pulsation measurement and simple calculation, and the indirect measuring method is convenient and rapid to implement.

The invention relates to a method for detecting rotating mechanical blade vibration, in particular to a method for detecting high speed rotating blade synchronous vibration parameters under speed change, aiming at providing a method for detecting high speed rotating blade synchronous vibration parameters under speed change with high resolution preciseness and strong adaptability. The technical proposal of the invention comprises the following steps: step 1, determining a multi-sensor distribution scheme of blade tip timed vibration measurement: firstly pre-estimating the synchronous vibration frequency multiplication Ne possible to occur to the blade to be detected according to the actual detected rotating mechanical performance, and secondly determining the number and distribution condition of the mountable blade tip timed sensors and determining the mounting angles among the sensors according to the actual requirement of the rotating machinery; step 2, carrying out synchronous vibration measurement according to the above determined scheme; and step 3, adopting the traversal method to precisely obtain blade resonance frequency multiplication Ne, natural frequency fn and other parameters. The invention is mainly used for detecting rotating mechanical blade vibration.

The invention discloses an underground high-conducting visualizer and an observation method thereof. The invention includes a plurality of plugging devices that are connected in series; a water injection pipeline between two neighboring plugging devices is provided with a water injection opening; one end of the water injection pipeline is connected with a water injection control platform; the plugging pipelines are mutually communicated by external connecting pipelines and are connected with expansion pipelines. When in use, firstly bores are drilled in the cover rocks needed observing; then the plugging devices connected in series are pushed into the preset position of the bores; gas is pumped into the expansion pipeline and then one section of the bores is plugged into a plurality of sections; water is injected into the water injection pipelines and the water injection opening on the water injection pipeline between the two neighboring plugging devices are opened in sequence; water is injected into the terrane that the section of bores lies in; finally the cranny growth situation inside the cover rocks is analyzed according to the water injection seepage discharge of each section of terrane. The underground high-conducting visualizer has simple structure, is convenient for use, can realize simultaneous plugging, water injection by section and multi-section seepage detection, improve the observing efficiency and has highly reliable detection result.

Images of farm animal products taken by CCD camera through image acquisition card are transferred to computer. Under certain condition (temperature, humidity and flow rate), smells emitted from farm animal products through mini pump with no oil are sucked into reaction chamber, where signals are generated by array of gas sensor. The said signals through conditioning circuit, A/D acquisition card are transferred to computer. Computer for simulating human brain to treat vision data and smell data carries out syncretizing and pattern recognition processing. Combining with experts' knowledge in knowledge base as well as experiences, computer makes judgment for qualities of garden spgarden stuff, meat and corns etc. synthetically.

The invention discloses a detection method for the expression of a GPR120 gene based on eGFP. The detection method comprises the following steps: inserting an eGFP fragment to the specific site TAA of the termination codon of the GPR120 gene by using CRISPR/Cas 9 technology so as to obtain a transgenic model mouse with eGFP-labeled GPR120 positive cells; and carrying out excitation by using a fluorescence analyzer and determining the fluorescence intensity of the positive cells of the mouse. The method carries out real-time monitoring on the expression of the GPR120 gene so as to control and reduce errors among groups, guarantee the reliability of results and compensate for and overcome the problems of variability caused by comparison of different groups of histocytes and incapability of monitoring the changes of gene expression at a living cell level in the prior art. According to the invention, the expression level of the GPR120 gene can be immediately determined after collection of cells, and operations and reactions like RNA extraction, inverse transcription and PCR are omitted, so detection of the expression of the GPR120 gene is simpler.

A combined microwave sensor comprises metal ground at the bottom layer, dielectric at the middle layer, an input port, an output port I, a branched line coupler, a power divider, an open resonant ring, a microstrip line I and a microstrip line II, wherein the input port, the output port I, the branched line coupler, the power divider, the open resonant ring, the microstrip line I and the microstrip line II are arranged in the top layer. The input port and the output port I are connected with a vector network analyzer. The output side of the branched line coupler is provided with an isolated port and the output port I. The input end of the power divider is connected with the input port. The output port II and the output port III are connected with an annular directional coupler through a microstrip line. The open resonant ring is arranged between the power divider, the branched line coupler and the two microstrip lines. The combined microwave sensor has advantages of effectively eliminating background noise, realizing testing for weak background signals, and ensuring large offset of the sensor resonant frequency through small disturbance of the tested object. Therefore the combined microwave sensor provided by the invention has higher sensitivity and higher accuracy in dielectric constant measurement and can be used in high-sensitivity testing with small dielectric constant change.

The invention discloses a 25-hydroxy-vitamin D3 detection kit, as well as a preparation method and applications thereof. The detection kit consists of a reagent I and a reagent II which are independent from each other, wherein the reagent I comprises the following components: a 25-hydroxy-vitamin D3-BSA conjugate, a biobuffer, a chelating agent, a surface active agent, a coagulant, a preservative, a stabilizer and water; the reagent II comprises the following components: rubber latex particles coated by a 25-hydroxy-vitamin D3 antibody, a biobuffer, a chelating agent, a surface active agent, a suspending agent, a preservative, a sealing agent, a stabilizer and water. The detection kit disclosed by the invention is high in detection sensitivity, high in specificity, accurate in quantification and wide in linear range, and is especially suitable for the detection of samples with extremely low 25-hydroxy-vitamin D3 content. In addition, the detection kit disclosed by the invention does not need to dilute the samples in advance in the detection process, facilitates the clinical use, and is easy to operate, low in detection cost and suitable for various full-automatic biochemical analyzers.

The invention provides a monitoring method for a surrounding rock and full face tunnel boring machine shield interaction process. The method comprises the steps of: A, welding and installing pressure boxes to the outer surface of a shield for testing the extrusion force applied to the shield by surrounding rocks directly, placing cables of the pressure boxes in flexible cable-protecting casing pipes, and leading the cables into the shield and connecting the cables to a reading device; B, installing a surface strain sensor in each of the annular direction and the longitudinal direction of each monitoring point on the inner surface of the shield, and inversely calculating the extrusion force applied to the shield by the surrounding rocks according to the principle of elastic mechanics based on the tested annular and longitudinal strains of the inner surface of the shield; C, according to the acquired distribution rules of the extrusion force applied to the shield by the surrounding rocks, calculating the friction force borne by the shield on the premise of linear distribution of the extrusion force between two adjacent measuring points; D, according to the jamming state judging criteria and jamming risk coefficient calculation method, calculating whether the shield is jammed and giving early warning of a jamming risk level. The method solves the problem in monitoring of surrounding rock and shield interaction in a shield type TMB tunneling process, provides basis for the predictive analysis of jamming accidents and is of great importance for the safety of TBM tunneling.

The invention relates to the technical field of reliability test of a disc-type tool magazine and automatic tool-changing system for a machining center and specifically relates to a disc-type tool magazine and automatic tool-changing system comprehensive performance detection platform. The detection platform comprises a detection system, a test system and a control system. The detection system is used for finishing detection and collection of various parameters of the disc-type tool magazine and automatic tool-changing system; the test system is used for testing the reliability of the same-kind multi-dimension disc-type tool magazine and automatic tool-changing systems; and the control system is used for finishing setting of related test parameters in the test process and carrying out processing and analysis on the collected parameters, graphical display and test result display, and realizing comprehensive control of the detection system and the test system. The comprehensive performance detection platform is a test platform capable of loading the same-kind multi-dimension disc-type tool magazine and automatic tool-changing systems; and especially, the platform can carry out detection on the state and performance of the disc-type tool magazine and automatic tool-changing system and give corresponding analysis results.

The invention relates to a device for measuring rotational inertia and friction moment of a ball screw. The device comprises a bottom plate, two linear guide rails, the ball screw, a torque sensor, a servo motor, a mobile platform and two friction moment measuring mechanisms. Each linear guide rail is provided with two sliding blocks. The two ends of the ball screw are supported by the part, located between the two linear guide rails, of the bottom plate in a rotary mode through a fixed supporting base and a floating supporting base. One end of the torque sensor is connected with the end, supported by the fixed supporting seat, of the ball screw through a coupler. An output shaft of the servo motor is connected with the torque sensor through a coupler. The two friction moment measuring mechanisms are arranged on the two sides of a screw nut base respectively. Each friction moment measuring mechanism comprises a cantilever. A connecting sleeve is arranged at the tail end of each cantilever. Each connecting sleeve is connected with a sliding bar through a vertical linear bearing. The other end of each sliding bar is connected with a pressure sensor. Each sliding bar is sleeved with a spring. The bottom of each pressure sensor is connected with a universal ball. The bottom of each universal ball makes contact with a linear slab which is parallel to the ball screw. The linear slabs are tightly connected to the bottom plate.

The invention discloses a data demodulation method for polarization maintaining fiber stress sensing. The method comprises the following steps of: acquiring an interference signal by using a polarization maintaining fiber stress sensing test system to acquire photovoltage data; pre-processing the photovoltage data, averaging every n points to acquire new photovoltage data, and data volume; decomposing a photovoltage data signal into an intrinsic mode function (IMF) component and an allowance by an experimental mode method; finding out a basic component and identifying a small coupling point; reconstructing coupling intensity of a signal, and calculating the stress magnitude through intensity of each coupling point so as to realize the distributed detection of a system; and calculating indexes which can show the system test accuracy, such as a signal-to-noise ratio and the like. The method can effectively improve the signal-to-noise ratio of the polarization maintaining fiber stress sensing system, and improves the identification capacity of weak coupling points and the sensitivity of a coupling test. Under the environment of relatively low signal-to-noise ratio, microstress can be detected well.

A method and apparatus for measuring at least one polarization-related characteristic of an optical path (FUT) uses a light input unit connected to the FUT at or adjacent a proximal end of the FUT anda light output unit connected to the FUT at or adjacent its proximal or distal end. The light input unit injects into the FUT at least partially polarized light having a controlled state of polarization (I-SOP). The output light unit extracts corresponding light from the FUT, analyzes and detects the extracted light corresponding to at least one transmission axis (A-SOP), and processes the corresponding electrical signal to obtain transmitted coherent optical power at each wavelength of light in each of at least two groups of wavelengths, wherein the lowermost (lambda 1) and uppermost (lambdau) said wavelengths in each said group of wavelengths are closely- spaced. A processing unit than computes at least one difference in a measured power parameter corresponding to each wavelength in awavelength pair for each of the at least two groups, the measured power parameter being proportional to the power of the said analyzed and subsequently detected light, thereby defining a set of at least two measured power parameter differences; computes the mean-square value of said set of differences; and calculating the at least one polarization-related FUT characteristic as at least one predetermined function of said mean-square value, the predetermined function being dependent upon the small optical frequency difference between the wavelengths corresponding to the said each at least said two pairs of closely-spaced wavelengths.

The invention relates to a technique for measuring an initial attitude of a high-speed rotating projectile body at a muzzle, in particular to a method for measuring the initial attitude of the high-speed rotating projectile body at the muzzle based on a three-axis micro electro mechanical system (MEMS) accelerator and two nonorthogonal distributed MEMS gyroscopes to solve the problem of accurately measuring the high-speed rotating projectile body with high axial overload and high angular speed. The method for measuring the initial attitude of the high-speed rotating projectile body at the muzzle comprises the following steps: (I) establishing a cannon emission coordinate system as a reference coordinate system, setting an emission point of the projectile body in a barrel as an original point of the reference coordinate system, and arranging the barrel in an XnOYn plane of the reference coordinate system; establishing a projectile body coordinate system, setting a projectile body core as an original point of the projectile body coordinate system, and enabling an axis to be along the axial direction of the projectile body; and in the whole process of emitting the projectile body to the muzzle, ensuring that the yaw angle of the projectile body is zero and the pitch angle is not changed. The design is reasonable, and the measurement problem that the range and the accuracy are conflicted when the axis angular rate of the projectile body is measured is solved through the two high-precision small-range gyroscopes.

A detection method of a nitrofuran metabolites and chloramphenicol multiresidue in shrimp belongs to the technical field of aquatic products detection. The method is as below: hydrolyzing a sample with hydrochloric acid, subjecting nitrofuran metabolites to derivatization by using 2-nitrobenzaldehyde, adjusting the pH value to 6.5-7.5, adding acetonitrile, adding an extraction salt package; conducting liquid-liquid extraction of a target compound by using acetonitrile; purifying and concentrating a supernatant; then determining by a liquid chromatography-tandem mass spectrometer, and quantifying by an internal standard method. The method uses a novel sample extraction and purification mode for simultaneous analysis and determination of two prohibited drugs with the highest detection rate in shrimp, overcomes the limitations of separate determination of two drugs in the detection method of the prior art, improves the extraction efficiency of chloramphenicol in actual positive samples, greatly improves the work efficiency, shortens the work time and saves reagent consumption and labor costs. The method adopts the isotope internal standard method for quantification, the determination result is more accurate and reliable, has high sensitivity, and good reproducibility and quantitative accuracy.

The invention discloses a cardiovascular function detection method based on multi-channel pulse wave form analysis and a device thereof. A cardiovascular function evaluation index system suitable for health screening and personal dynamic detection is built by collecting blood pressure of upper limbs and lower limbs and multi-channel pulse wave form of neck, thigh, radio and ankle, and quality analysis and control can be conducted on evaluation index in the system. Simultaneously, the device is convenient to operate, low in cost and capable of well meeting requirements of large crowd for cardiovascular disease screening.

The invention discloses an isotope dilution mass spectrometry method for determining the content of uranium in a uranium niobium alloy. A formula for calculating the content of uranium in the uranium niobium alloy is derived according to an isotope dilution mass spectrometry principle. A decomposition process of the uranium niobium alloy is researched, the sampling quantity and the amount of a diluent are optimized, and the influences of mass spectrum line interference and alloy element interference on a measurement result are discussed. The method comprises the following steps: adding nitric acid and hydrofluoric acid to quantitatively dissolve the uranium niobium alloy, adding a quantitative amount of a uranium isotope diluent to directly prepare a mixed sample solution, determining the mixed solution and the uranium isotope proportion in the uranium niobium alloy sample through mass spectrometry, and calculating the content of uranium in the uranium niobium alloy. Quantitative separation of uranium is not needed by the determined method. An XRF technique, an ICP-AES technique and an element analysis technique are used to measure the content of niobium and the total content of impurity elements in the uranium niobium alloy, and back stepping is carried out to obtain the corresponding uranium content order in order to verify the accuracy of the analytical result, and the obtained result is consistent with a result obtained through the experiment method. When the method disclosed in the invention is used to analyze the uranium niobium alloy sample, the relative standard uncertainty of determination results is 0.2% (6 determinations), and the expanded uncertainty is 0.5% (95% confidence level).

The present invention is continuous drilling flow rate capable of predicting coal draft outburst and its apparatus. By means of the method of drilling holes in the coal bed drilling direction for data acquisition and the apparatus comprising hole sealing capsule unit, solid-gas separator, filter, coal bit controller, electric rock drill with connected displacement sensor LXC, controller unit KZ with explosion resistant enclosure and connected computer data acquisitor SC, the present invention can determine the gas distribution in the drilling direction, obtain the gas flow rate distribution curve along the drilling depth during coal bed drilling process, so as to determine the distance of soft coal containing high pressure gas to the ground, judge the distance to the place with maybe outburst. The present invention has compact reasonable structure, high accuracy and stable and reliable measurement result, and may be used widely.