14 results about "Linear measurement" patented technology

The utility model provides a laser level gauge linear type measuring frock, including base, be provided with support cover on the base, be provided with 360 degree conical mirror glass tube on the support cover, still be provided with light source and lens support jig on the base. The utility model can adjust and fix focal length, has the advantages that the precision is high, the efficiency is high to the repeated measurement of same lens.

The application discloses an edge computing network service function chain embedding method based on K shortest path, and aims at a distributed service function chain embedding problem under time delay constraint. In the case of meeting the end-to-end time delay constraint, a service function embedding algorithm based on K shortest path algorithm is designed to minimize the deployment cost. The application firstly proposes a service function embedding problem modeling method based on a weighted layered graph, and converts the service function chain embedding problem into a minimum cost path problem under time delay constraint in the weighted layered graph. Secondly, a service function chain embedding mechanism under time delay constraint is designed based on the weighted layered graph and K-linear measurement aggregation algorithm. Compared with the prior art, the application has better high performance and operability, and has practical significance for complex network applications in edge computing networks.

The application provides a visible light band optical fiber SPR liquid refractive index linear measurement device and method, the device comprises a broadband light source, a first lens and a second lens, a polarizer, a third lens and a fourth lens, a pinhole, a fifth lens, an optical fiber SPR, a sixth lens, a diffraction grating, a concave mirror, a linear array CCD and a data processing unit; the data processing unit is used for extracting the resonance wavelength corresponding to the normalized light intensity minimum value from the wavelength-intensity spectrum curve, and calculating the refractive index of the liquid medium to be measured according to the linear relationship between the refractive index and the resonance wavelength which is calibrated in advance. The device is not only intuitive in optical path debugging and easy to operate, but also has a rigorous theoretical model and high measurement precision, and is very suitable for rapid and accurate refractive index screening and analysis of a large number of low-concentration liquid samples, and has wide application prospect and industrial value.

This invention discloses a linearization method for eddy current displacement sensors based on exponential carrier pulse width modulation (PWM). This method addresses the problem of limited linear measurement range of the output voltage of eddy current displacement sensors. First, the displacement-voltage characteristic curve of the eddy current displacement sensor is measured. Then, a linearization circuit based on exponential carrier PWM is constructed, and the circuit parameters are adjusted so that the shape of the exponential carrier is identical to the displacement-voltage characteristic curve of the eddy current displacement sensor. The output voltage of the eddy current displacement sensor to be linearized and the exponential carrier are pulse-width modulated (PWM). A standard PWM waveform is obtained by passing it through a double inverter, then filtered in a low-pass filter, and finally the linearized voltage of the eddy current displacement sensor is output. This invention effectively improves the linearity of eddy current displacement sensors, enabling them to have a wider linear measurement range within a given measurement range.

Device (10) for detecting an object surface (16), comprising: a radiation generating device (17) with at least one radiation source (12), wherein the radiation generating device (17) is configured to emit first electromagnetic radiation with a first wavelength and second electromagnetic radiation with a second wavelength onto a linear measuring field on an object surface (16) with at least one measuring point (32) of the object surface (16) to be measured or an area of ​​the object surface (16) to be measured, which has at least one measuring point (32) to be measured, wherein the radiation generating device (17) is configured to emit no radiation or radiation used for surface detection onto the measuring point (32) to be measured or onto the area of ​​the object surface (16) in a wavelength range between the first wavelength and the second wavelength.such that the first and second wavelengths are different from each other; and a detection device (31) configured to detect at least one first measurement value and at least one second measurement value for each of the measurement points (32) to be measured, wherein the first measurement value is based on radiation with the first wavelength reflected from the object surface (16) and the second measurement value is based on radiation with the second wavelength reflected from the object surface (16), characterized in that the first and second measurement values ​​are each distance values ​​to the object surface (16) and are determined by triangulation, wherein the detection device (31) comprises an optical separating element (36) to divide the radiation reflected from the object surface (16) into a first and a second radiation component (40, 44), wherein the detection device (31) comprises a photosensitive unit (34),wherein the radiation components (40, 44) separated by means of the optical separating element (36) strike the photosensitive unit (34) at offset points of impact (42, 46), wherein the optical separating element (36) is a dispersion prism or an objective of the detection device (31) serves as the optical separating element (36).

The invention relates to a device and a method for determining the position of a magnet, an actuator for a steer-by-wire, in particular a device and a method for precisely determining the position of a magnet along a track, in particular for steer-by-wire applications, preferably for an actuator for a rear axle steering. The device comprises a sensor unit with a Hall sensor and a Hall switch arranged along the track. The Hall sensor detects the position of the magnet within a linear measuring range, while the Hall switch provides additional information about the position of the magnet. The misalignment between the Hall sensor and the zero position of the magnet enables an extended adjustment range and a flexible reinitialization. The method comprises moving the magnet from an initial position to a reference position, e.g. the position of the Hall sensor, and moving it again to the zero position based on at least one stored offset value. This enables a precise reinitialization after a system failure.

A device and method for precisely determining the position of a magnet along a path is proposed, particularly for applications such as steer-by-wire steering systems, preferably in a rear-axle steering actuator. The device comprises a sensor unit with a Hall sensor and a Hall switch arranged along the path. The Hall sensor detects the position of the magnet within a linear measuring range, while the Hall switch provides additional information about the magnet's position. An offset between the Hall sensor and a zero position of the magnet enables an extended positioning range and flexible re-initialization. The method involves moving the magnet from a starting position to a reference position (e.g., the position of the Hall sensor) and then to the zero position based on at least one stored offset value. This allows for precise re-initialization after system failures.

The application discloses a signal source positioning method and system based on zero norm outlier separation, and belongs to the technical field of wireless communication and positioning, comprising the following steps: acquiring distance measurement values between a signal source and multiple sensors, and constructing a pseudo-linear measurement model; constructing a projection matrix according to the pseudo-linear measurement model, eliminating source position variables in the pseudo-linear measurement model by using the projection matrix, and constructing an underdetermined observation equation; solving the underdetermined observation equation by using an iterative solving mode, and restoring an outlier deviation by using a hard threshold mode in the solving process; correcting the acquired distance measurement values according to the restored outlier deviation, and constructing an optimization problem with a quadratic equality constraint according to the corrected distance measurement values; and solving the optimization problem with the quadratic equality constraint by using a Lagrange multiplier method, so that the position coordinates of the signal source are obtained. By separating and eliminating sparse outliers, and combining with geometric constraint optimization, the application realizes high-precision and high-robustness signal source positioning.

A tape measure device including a housing with branding options, a lock tab mechanism for controlling tape extension / retraction, and compatibility with different tape lengths is disclosed. The tape measure blade incorporates three distinct sets of ascending and descending numbers, each tailored for specific measurement scenarios. The first set offers traditional ascending linear measurements, identical to a standard tape measure, simplifying common length assessments. The second set (i.e., descending set) is engineered for calculating differences (i.e., section cut-offs) in 8-foot building materials, while the third set (i.e., descending set) caters to 12-foot materials. The aforementioned sets enable users to quickly identify and cut precise lengths without the need for extensive tape measure blade extension. The device's design optimizes ease of use, portability, and secure storage through a belt clip.

The application discloses a two-degree-of-freedom linear displacement sensor and a measuring method, and belongs to the technical field of measurement and sensing. The sensor comprises a dynamic ruler base body and a fixed ruler base body, the fixed ruler base body is provided with parallelogram excitation electrodes arranged along an x direction, and the dynamic ruler base body is provided with parallelogram sensing electrodes arranged along the x direction. The excitation electrodes and the sensing electrodes are arranged at a certain angle with the length direction of the fixed ruler base body; the displacement value solved by the output signal of the sensing electrodes is inversely deduced through a trigonometric function, and the real displacement value of the dynamic ruler base body when moving along the x direction and the y direction can be obtained. The excitation electrodes and the sensing electrodes are both arranged obliquely, the displacement values of the two rows of sensing electrodes are solved through a trigonometric function, and the displacement in the x direction and the y direction can be measured simultaneously. The sensor has a simple structure, one reading head can measure two directions simultaneously, and the offset error caused by linear measurement is effectively reduced.

This invention relates to the field of seismic data processing technology, specifically to a linear relaxation measurement device, comprising a sensor module, a signal conditioning module, an analog-to-digital conversion module, a data processing module, a storage module, and an interface module; wherein the data processing module includes a constitutive projection and factorization unit, a constitutive degree evaluation and ranking unit, a relaxation measurement equation establishment unit, and a calculation unit; this invention, by determining and setting relaxation variables in the relaxation measurement equation establishment unit, obtains high-precision measurement results for some target parameters in the linear measurement system that are closer to the constitutive properties, achieving optimal linear measurement accuracy, and making the measurement accuracy of some key parameters higher than that of traditional methods.

This invention belongs to the field of sound field reconstruction and sound source identification technology. It discloses an equivalent source sound field localization method and system based on sparse sound intensity measurement. The method involves acquiring complex sound pressure and complex particle velocity at measurement points on a holographic surface using a vector sensor array, and calculating the measured sound intensity vector. A sound intensity transfer matrix is ​​constructed based on the equivalent source method, establishing a linear measurement equation between the measured sound intensity vector and the equivalent source intensity vector. Utilizing the spatial sparsity of the equivalent source intensity, the solution for the equivalent source intensity vector is transformed into an L1 norm sparse optimization problem, solved using a convex optimization algorithm to obtain the optimal equivalent source intensity vector. Based on the optimal equivalent source intensity vector, the acoustic quantities at any point in the target sound field are reconstructed using a free-field Green's function. This invention utilizes the active component of the sound intensity vector to suppress uncorrelated noise and combines compressed sensing theory to improve the ill-conditioned nature of the inversion, achieving highly robust and accurate sound source localization and sound field reconstruction without the need for a reference microphone.

Linear measuring instrument (100) comprising: a spindle (110); a guide cylinder part (220) configured to guide the spindle (110) so that it moves back and forth in an axis line direction; a guide slot section (240) formed parallel to the axis line of the guide cylinder part (220), providing a gap between the guide slot section (240) and the guide cylinder part (220); and a position adjustment pin (400) attached to a side face of the spindle (110) passing through the guide slot section (240), the position adjustment pin (400) being an eccentric pin.

This application provides a method, apparatus, device, medium, and aircraft for estimating aircraft disturbance parameters, relating to the field of aircraft control technology. The method includes: acquiring flight state data of the aircraft in the current flight cycle; the flight state data includes flight speed, flight acceleration, and thrust; constructing a residual measurement model based on the flight speed, flight acceleration, and thrust; the residual measurement model is constructed from residual measurements, wind speed, and load changes; and estimating the disturbance in the current cycle using the residual measurement model to obtain estimated wind speed and load change values. This application, by constructing a residual measurement model, transforms the complex coupling relationship between aerodynamic drag and mass change into a linear measurement model concerning wind speed and load changes, avoiding the cumbersome and unstable nature of nonlinear estimation. The estimation of wind speed and load changes is achieved by solving the residual measurement model.