26results about How to "Wide measurement range" patented technology

The invention discloses a rear-mounted holographic focusing schlieren imaging method. The method comprises the following steps: after a laser emits a laser beam, the laser beam is divided into a main light source and holographic reference light; a main light source sequentially passes through a multi-stage beam expander, a soft light screen, a Fresnel lens and a source grating to obtain light beams with alternate brightness and darkness, and the light beams irradiate a flow field; the light beam penetrating through the flow field is focused by the focusing lens, an image of the source grating is formed at the knife edge grating through the focusing lens, and the light beam penetrating through the flow field is modulated by the knife edge grating, so that an image of the section of the flow field is formed behind the knife edge grating; the light beam modulated by the knife edge grid passes through the field lens and is recorded together with the holographic reference light to obtain a holographic focusing schlieren map; performing digital reconstruction to obtain three-dimensional flow field position information; and calculating the three-dimensional density gradient and the density value of the flow field based on the imaging principle of focusing schlieren. The invention further discloses a rear-mounted holographic focusing schlieren imaging system. According to the method and the system, the ultra-high-speed flow field can be measured, and the requirement of an ultra-high-speed aircraft test on fine quantitative measurement of the three-dimensional flow field is met.

The invention belongs to the technical field of sewage pipeline flow detection, and particularly relates to a sewage pipeline flow calculation method based on electromagnetic induction, which comprises the following steps: step 1, a detection mechanism is arranged between two butt-joint flowing sewage pipelines, and the detection mechanism is composed of a measuring pipe, an electrode and an excitation coil, the magnet exciting coil wraps the outer arc surface of the measuring tube. The sewage pipeline flow calculation method based on electromagnetic induction is high in measurement precision and suitable for various conductive media including sewage, corrosive liquid and a mixture containing solid particles; the measuring range is wide, and the device is suitable for measuring fluids with different pipe diameters and flow ranges. The electromagnetic flowmeter can be quickly mounted on the sewage pipe through the quick clamping mechanism, so that the mounting time is shortened, the labor intensity is reduced, and maintenance and calibration are facilitated; measurement errors caused by fluid interference are avoided by reducing accumulation of sediments, and the accuracy of circulation measurement is further enhanced by circular motion measurement of the electrodes.

The invention relates to an inertial navigation / polarization compass / laser velocimeter integrated navigation method, which belongs to the technical field of inertial navigation / integrated navigation, and comprises the following steps: mounting and fixing an inertial navigation system, a polarization compass and a laser velocimeter on a carrier, and acquiring coordinate systems of sensors; establishing a polarization compass error equation and a laser velocimeter error equation by considering a course angle installation error, a pitch angle installation error and a scale error of the laser velocimeter; and deriving an inertial navigation / polarization compass / laser velocimeter combined system state equation based on the error equation, establishing a measurement equation by taking the difference between the speed calculated by inertial navigation and the speed of the laser velocimeter and the product of the polarization vector of the polarization compass and the sun vector as observed quantities, and carrying out estimation and feedback correction on the system state. The invention provides an inertial navigation / polarization compass / laser velocimeter combined navigation method in a satellite navigation denial environment, which realizes full-autonomous and high-precision directional positioning.

The invention discloses an automatic detecting and adjusting device for a bogie. The automatic detecting and adjusting device comprises a gantry motion unit supporting device, a gantry type motion measuring unit and a gantry type motion adjusting unit. The gantry motion unit supporting device comprises two equipment foundations, a gantry motion bottom adjusting guide rail, a gantry motion top adjusting guide rail, a cross beam and stand columns, the two equipment foundations are symmetrically arranged on the two sides of the gantry motion unit supporting device, the two stand columns are installed on the equipment foundation on each side, and the cross beam of a high-low double-layer step structure is installed on the two stand columns. A gantry motion bottom adjusting guide rail is installed on a lower step of the cross beam and used for installing a gantry type motion measuring unit and achieving displacement of the gantry type motion measuring unit along the gantry motion bottom adjusting guide rail, and a gantry motion top adjusting guide rail is installed on an upper step of the cross beam. And the gantry type motion adjusting unit is mounted, and the displacement of the gantry type motion adjusting unit along the gantry motion top adjusting guide rail is realized. The device can be suitable for measurement and adjustment of bogies of various specifications and types, the measurement range is wide, and the adjustment efficiency is high.

The invention discloses a river sediment content measuring device and method based on ultrasonic attenuation, and relates to the field of river sediment concentration monitoring. A digital-to-analog conversion module in the device is arranged on an FPGA development board; the digital-to-analog conversion module is connected with the ultrasonic transmitting probe; the ultrasonic receiving probe is connected with the analog-to-digital conversion module; the analog-to-digital conversion module is connected with the FPGA development board; the ultrasonic transmitting probe is used for transmitting ultrasonic waves under the driving of the excitation signal transmitted by the digital-to-analog conversion module; the ultrasonic waves are used for spreading in a to-be-detected river in a gradual attenuation mode; the ultrasonic receiving probe is used for receiving ultrasonic waves propagating in a river to be detected, generating voltage signals according to the received ultrasonic waves and sending the voltage signals to the FPGA development board; and the FPGA development board is used for determining the sediment concentration of the river to be measured according to the voltage signal and the calibration curve. According to the invention, high-precision and wide-dynamic-range real-time measurement of the sediment content of the river can be realized.

This utility model relates to the field of generator set maintenance technology, and in particular to a generator set fault location circuit. A voltage acquisition element measures and collects voltage waveform signals from the generator terminals and the low-voltage side of the main transformer; a current acquisition element measures and collects the zero-sequence currents from the generator terminals, the high-voltage side of the excitation transformer, the low-voltage side of the main transformer, and the high-voltage side of the high-voltage transformer; the fault location element transmits data through a signal transmission interface connected to the terminals of the current acquisition element. This system can accurately determine the location of a single-phase ground fault, narrowing the fault location range and improving maintenance efficiency. The optical current transformer is unaffected by conductor spatial arrangement and magnetic field imbalance, accurately measuring zero-sequence current with a wide measurement range and no saturation problem. The insulating frame of the primary sensing unit can be designed according to the size and arrangement of the three-phase conductors being measured in the protected generator set, without strict requirements on conductor shape, size, and arrangement, facilitating installation and maintenance.

The utility model provides a single iron core measures ac leakage current system, it has solved leakage current detection circuit cost higher problem, it includes power module, power module is connected with measurement circuit and MCU module, measurement circuit has two groups of operational amplifier follower, one group of operational amplifier follower is connected through sampling resistance R9 with the one end of the measurement coil that is wound on annular core, the other end of measurement coil is connected through another group of operational amplifier follower with the PWM pin of MCU module, the ADC pin of MCU module is connected on sampling resistance R9. The utility model has good leakage detection effect, lower cost and the like advantages.

The utility model relates to a detection circuit for a touch screen. A port of the touch screen is sequentially connected with a voltage dividing module, a detection module and an output module. The voltage dividing module is used for simulating voltage when the touch screen is pressed and inputting the voltage to the detection module, the detection module is used for detecting the voltage, and when the voltage is within a set voltage range, the output module displays the voltage. The voltage division module of the detection circuit can simulate voltage division when the touch screen is pressed, so that resistance detection can be performed on a plurality of ports of the touch screen at the same time by pressing the touch screen once during detection, and rapidness and convenience are achieved; the detection module is used for limiting the standard voltage range of the touch screen and comparing the partial voltage generated by the voltage dividing module, if the partial voltage is within the standard voltage range, the detection result is displayed on the output module, automatic detection can be achieved, manual operation is not needed, time and labor are saved, and the detection result is accurate.

The application belongs to the field of distributed optical fiber sensing detection, and discloses a distributed strain and temperature sensing device and method based on chaotic laser Rayleigh scattering. The device comprises a chaotic laser. Chaotic laser emitted by the chaotic laser enters a pulse modulator after an isolator, is modulated into pulsed laser, then enters a sensing optical fiber through a first optical circulator after a light amplifier and a polarization scrambler. Rayleigh scattering occurs along the sensing optical fiber, backward Rayleigh scattering light signals are output after returning to the first optical circulator, and are converted into electric signals by a photoelectric detector. The electric signals enter a data processing system after a data acquisition card. Quantitative measurement of strain is realized through linear relationship between cross-correlation frequency shift and strain or temperature. The application uses chaotic laser with low coherence state as detection light pulse, which can ensure wide measurement range under medium sensitivity.

The present disclosure relates to a kind of rotating speed detection device and magnetic suspension bearing system, belong to magnetic suspension motor technical field, rotating speed detection device includes control panel and silicon steel sheet assembly, silicon steel sheet assembly includes multiple layering silicon steel sheet groups;Along the length direction of silicon steel sheet assembly, silicon steel sheet assembly includes first end and second end, first end and second end are all set first probe and second probe;First probe and second probe are oppositely arranged at the same end of silicon steel sheet assembly, and the interval between first probe and second probe is greater than or equal to the thickness of silicon steel sheet group;Coil is wound on first probe and second probe respectively, and coil is connected with control panel.The rotating speed detection device of the present disclosure has strong anti-interference ability, strong output signal, wide measurement range, low maintenance cost, and the operation of rotating speed detection device does not need mechanical action, does not need lubrication, compact structure, easy to install.

A reflective online coating thickness gauge includes a mounting platform, a slide, a limit switch, a motor, a control cabinet and a thickness measuring component; the slide is arranged on one side of the mounting platform, and the thickness measuring component is movably embedded in the slide and driven by a motor to move. This thickness gauge uses visible light to measure film thickness online. In addition to avoiding the problems existing in infrared and ray methods, this thickness gauge has a wide measurement range and high measurement accuracy. It is currently the most ideal measurement method for online coating thickness measurement.

The application discloses a kind of based on double optical comb linear optical sampling optical fiber time delay measurement method and device, for solving the problem of high-precision optical fiber time delay precision measurement in information science and optical fiber communication, its characteristics are using two optical comb modules with small difference in repetition frequency, the optical comb signals generated by it are divided into a total of 4 optical comb signals after beam splitting;One optical comb signal generated by one optical comb module is divided into one after beam splitting, and the other optical comb module is divided into one after beam splitting to obtain an electrical signal by linear optical sampling;After linear optical sampling, the remaining 2 optical comb signals obtain another electrical signal;The time delay of the two electrical signals amplified by a fixed multiple is measured to calculate the time delay of the optical fiber to be measured.Compared with the prior art, the device has a simple structure, higher measurement accuracy and a large measurement range in theory, and has the prospect of integration and miniaturization, and is expected to have important applications in the fields of optical fiber sensing and precision measurement.

In order to provide an exhaust gas analysis apparatus that, without the need to greatly change the flow rate of diluted exhaust gas passing through a filter, for example, when switching a driving mode, can change the flow rate of exhaust gas in the diluted exhaust gas passing through the filter with good followability to reflect weighting, and accurately measure PM, the exhaust gas analysis apparatus is adapted to include: a collection part that collects particulate matter in sampling exhaust gas partially splitting from original exhaust gas or in the diluted exhaust gas resulting from diluting the sampling exhaust gas with diluent gas; and a split flow ratio control mechanism configured to, in accordance with a vehicle driving mode set in compliance with predetermined regulations, change a split flow ratio that is the ratio of the split flow rate of the sampling exhaust gas to the total flow rate of the original exhaust gas.

The present invention discloses a polyacrylamide-sodium alginate-polypyrrole composite conductive hydrogel and its application. The present invention adopts a one-pot method to synthesize polyacrylamide-sodium alginate hydrogel, and dopes pyrrole into the composite hydrogel by dipping, and then oxidizes pyrrole by ferric chloride solution, and polymerizes it into polypyrrole in situ by the molecular template effect of sodium alginate, and the obtained polypyrrole nanospheres are evenly dispersed in the hydrogel matrix, and finally obtains a polyacrylamide-sodium alginate-polypyrrole composite conductive hydrogel with good conductivity, ultra-high tensile performance, high strength, high toughness, good biocompatibility, certain self-repair and self-adhesion ability. The composite conductive hydrogel of the present invention can be used to prepare a tensile strain sensor, which has the characteristics of high sensitivity, rapid response, large detection range, etc. The present invention is simple to operate and concise in steps, and is suitable for multiple related fields such as human motion detection, vocalization monitoring, and electronic skin.

The present application relates to a kind of angle sensor assembly and angle measurement method, belong to angle measurement technical field.The angle sensor assembly of the present application, with stator component and the rotor component of arbitrary angle rotation relative to stator component, stator component includes four electrode parts using magnetic multilayer film is formed, rotor component is the annular magnet or cylindrical magnet along its diametric direction magnetization is formed.The measurement method of the present application is relative to the angle sensor stator component configuration rotatable magnetic source, in three-dimensional space rotation the rotor component, according to the position relationship of the rotor component with the angle sensor stator component, using abnormal Hall effect or tunnel magnetoresistance effect measurement resistance characteristic, in the Cartesian coordinate system under prior calibration, the angle of radial magnetic field generated by magnetic source is projected on three orthogonal planes, so as to be able to efficiently measure the rotation angle of magnetic source relative to angle sensor.

The invention discloses a device and a method for rapidly detecting the alcoholic strength of white spirit based on a fluorescent indicator and a smart phone. The method comprises the following specific steps: firstly, preparing a fluorescent indicator stock solution; then, preparing a series of alcohol standard solutions with the alcoholic strength of 10-90%, adding the fluorescent indicator stock solution, photographing and recording fluorescent pictures of all samples by using a smart phone under the irradiation of an ultraviolet light source, and establishing a linear curve between the color channel ratio R / B and the alcoholic strength; and finally, adding the fluorescent indicator stock solution into a white spirit sample to be detected, obtaining a fluorescent picture, and calculating the alcoholic strength of the white spirit sample to be detected by utilizing the established linear curve. According to the method, the alcoholic strength is indirectly measured by using the chromaticity difference of the fluorescent indicator in samples with different alcoholic strength, and the method has the advantages of wide measurement range, small background interference, simplicity and convenience in detection operation and the like.

The application discloses a low-orbit atmospheric density measuring device and method in parallel with orbit departure, and belongs to the field of low-orbit spacecraft measurement and control. The application comprises a device shell, a film ball, an inflation system, a patch type pressure sensor, a pressing unlocking mechanism and a communication module B. The application adopts a spherical film device to inflate and expand to increase the windward area of constellation satellites, and improve the orbit departure efficiency of the constellation satellites. Meanwhile, the patch type pressure sensor is used to measure the resultant force borne by the orbit departure-measuring system. The real-time low-orbit atmospheric density is calculated in combination with the orbit data, the shape structure and the resistance coefficient of the orbit departure-measuring system. The folding method of the film ball is a combination of plane spiral bonding and z-type folding. The multiple plane petals of the film ball are sequentially spiral bonded and then z-type folded to form a cubic shape, so that the film ball is conveniently packaged. The application realizes the atmospheric density measurement of the area passed by the constellation satellites during the orbit departure based on the patch type pressure sensor, and has the advantages of low cost and real-time measurement.

This utility model relates to a multi-range flow measurement device, including a main cavity, a rotating shaft, a damping adjustment module, a sealing assembly, a swing rod assembly, a swing arm assembly, a baffle, a base, and an angle sensor. The rotating shaft is disposed within and extends through the main cavity. One end of the rotating shaft is connected to the damping adjustment module, and the other end is connected to the angle sensor. One end of the swing rod assembly is sleeved on the rotating shaft and securely connected, while the other end of the swing rod assembly is connected to the swing arm assembly, which has a baffle. The main cavity is installed at the flow measurement position via the base. During measurement, the baffle is in direct contact with the fluid. One end of the sealing assembly is connected to the main cavity, and the other end is connected to the swing rod assembly or the swing arm assembly, isolating and sealing the baffle and the fluid outside the main cavity. This utility model enables flexible adjustment and wide-range measurement. The damping adjustment module can adjust the damping force according to actual working conditions, avoiding the measurement inaccuracy caused by the baffle reaching its maximum range at high flow rates.

The present invention discloses a non-contact flow measurement device and method for oilfield injection wells, the device includes an ultrasonic transducer control unit, a time difference measurement chip circuit, and a single-chip control circuit, the ultrasonic transducer control unit is provided with two and respectively on the upstream and downstream sides of the downhole pipe wall, an angle θ is formed between the two ultrasonic transducer control units, the receiving end and the transmitting end of the two ultrasonic transducer control units are respectively connected to the time difference measurement chip circuit, and the time difference measurement chip circuit is connected to the single-chip control circuit. The present invention adopts non-contact measurement and is not affected by medium pressure, so the parameters such as viscosity and density of the fluid have limited influence on it; it has strong high temperature resistance and is suitable for various fluids, especially some fluids mixed with corrosive substances and high pH; it has high accuracy and sensitivity, a wide measurement range, good measurement stability and repeatability, and a wide range of applications.

This invention discloses an electric field sensor based on a chromium telluride resonant structure, comprising a chromium telluride layer, a first charge dielectric layer, a second charge dielectric layer, a charge residence region, a fixed support, and a fixed block. The chromium telluride layer is fixedly connected to the fixed block, and the fixed block is fixedly connected to the fixed support. The charge dielectric layer is disposed on the surface of the chromium telluride layer. This invention converts the measurement of the external electric field into a change in the resonant frequency of the chromium telluride layer. The intensity of the external electric field is determined by the change in the resonant frequency of the chromium telluride layer, thus obtaining the intensity of the external electric field. Due to the excellent resonant characteristics of the chromium telluride layer itself, the sensitivity and reliability of the electric field sensor are greatly improved. Furthermore, it can achieve a wide measurement range, excellent performance, low cost, and small size, and is easy to mass-produce.

This invention discloses a test method for determining the plastic strain ratio. By introducing the concept of a finite body and specifying the consistency of the measurement point positions before and after deformation, and using conventional measuring tools and different test conditions, the plastic strain ratio is determined, ensuring the stability of the data measurement results, improving test efficiency and reliability, and eliminating the problem of large fluctuations in the r-value measurement results caused by many uncontrollable factors in existing standards. It achieves accurate determination of the r-value in a low-cost, simple, and efficient manner. Therefore, this invention has important engineering practical significance and broad engineering application prospects.

This invention belongs to the field of chloride detection technology, specifically relating to a perovskite-based nanomaterial, its preparation method, and its application. The perovskite-based nanomaterial includes upconversion nanomaterials and Ag₂S quantum dots, with the upconversion nanomaterials and Ag₂S quantum dots linked by chemical bonds. The upconversion nanomaterials have a core-shell structure, with Yb 3+ / Er 3+ The perovskite-based nanomaterials form the core, which is then coated with a Cs₂NaYF₆ shell. The perovskite-based nanomaterials are added to the sample, and the emission intensity of the sample is measured in the 300–750 nm range under 980 nm laser excitation. The chloride concentration is calculated based on a standard curve. The perovskite-based nanomaterials prepared in this invention exhibit high detection accuracy in chloride detection, enabling quantitative detection of chloride at the micromolar level. Furthermore, the preparation method is simple and inexpensive.

The application discloses a beam distribution system capable of setting stations in three-dimensional space at will, comprising: a mounting cylinder arranged on a plurality of treatment rooms distributed radially in a circumferential direction; a combined rotating beam line arranged in the mounting cylinder and capable of rotating around a rotation axis perpendicular to the ground, used for distributing beam to each treatment room; a bracket structure installed in a specified height on the inner wall of the mounting cylinder in a ring shape; a laser tracker station setting system, comprising: a pin wheel unit installed on the bracket structure; a trolley unit drivingly connected to the pin wheel unit and capable of moving circumferentially around the combined rotating beam line; a lifting unit installed on the trolley unit and capable of moving vertically along the height direction of the combined rotating beam line; and a laser tracker unit installed on the lifting unit, capable of moving circumferentially around the combined rotating beam line with the trolley unit and moving vertically along the combined rotating beam line with the lifting unit, so as to realize three-dimensional space arbitrary station setting of the laser tracker unit in the mounting cylinder.

This invention discloses a composite conductive organic hydrogel, prepared by the following method: First, acrylamide, carboxylated cellulose nanofibers, and carboxymethyl chitosan are copolymerized in an aqueous glycerol solution to obtain a pregel. Then, pyrrole is incorporated into the pregel, and subsequently, pyrrole is oxidized using a ferric chloride solution, causing it to polymerize in situ into polypyrrole. The hydrogel of this invention uses polyacrylamide as the network framework, incorporating carboxylated cellulose nanofibers and carboxymethyl chitosan, and polymerizing polypyrrole in situ to form a multi-layered cross-linked network. The hydrogel of this invention possesses excellent mechanical properties, strong adhesion and easy peeling, high electrical conductivity, excellent freeze resistance, and biocompatibility. It can be used as a high-performance flexible strain sensor for human motion monitoring or as a bioelectrode for electrocardiogram signal acquisition, showing broad application prospects in wearable electronics and health monitoring.

The invention discloses a pulse per second time difference measuring system and method based on a field programmable gate array. Relates to the technical field of time measurement. A clock management module of a system generates two clock signals with opposite phases; the sampling model is used for sampling the input pulse per second twice in the same clock period based on the double data rate trigger so as to obtain a sampling signal of the pulse per second; the timestamp generation module is used for respectively generating a coarse count value and a fine time interpolation when an edge signal appears, and splicing the coarse count value and the fine time interpolation into a timestamp; and the time difference calculation output module calculates a difference value of the two generated timestamps to determine a time difference measurement result. The pulse per second is sampled twice in the same clock period through the double data rate trigger, and the measurement precision is improved under the condition that the clock period is not changed; and based on coarse time counting and fine time interpolation, wide-range measurement is realized, and the problem that high measurement precision and wide measurement range are difficult to consider in an existing pulse per second measurement method is solved.

This invention discloses an absolute planar two-dimensional time-grating displacement sensor and measurement method based on an alternating electric field. Excitation signals are sequentially applied to the X-excitation pairs. When the sensing electrode generates a sensing signal, the application of excitation signals to the remaining X-excitation pairs is stopped. By processing the four electrical signals generated by the sensing group, the position of the moving scale substrate within the X-excitation pair and its displacement position within that pair are obtained, thus yielding the absolute two-dimensional time-grating displacement value of the moving scale substrate relative to the fixed scale substrate in the X direction. Similarly, the absolute two-dimensional time-grating displacement value of the moving scale substrate in the Y direction is obtained. Then, the absolute two-dimensional time-grating displacement values ​​in the XY directions are used as the coordinates of the moving scale substrate in the XY directions, thus obtaining the absolute displacement of the moving scale substrate. This invention uses a scanning method to obtain the absolute position in the XY directions to achieve planar two-dimensional absolute displacement measurement, which can reduce cumulative and random errors, improve measurement accuracy, and achieve high-precision measurement over a large range.