17results about How to "High precision measurement" patented technology

The utility model relates to the technical field of cleaning of car washers, in particular to a cleaning strength adjusting device for a car washer, which comprises a water tank. A water pipe is installed at the end, away from the water tank, of the pipeline, a water gun head is connected to the end, away from the pipeline, of the water pipe, a filter screen is installed at a water inlet, extending into the water tank, of the pipeline, and the pipeline and the water pipe provide a path for conveying a water source; the variable-frequency water pump is responsible for conveying a water source of the cleaning vehicle, the distance measuring assembly comprises a fixing piece installed on the outer side face of the water gun head, an installation module, an infrared emitting module and an infrared receiving module, and the infrared emitting module is used for emitting infrared light to measure the distance between the spray head and a target; the distance between the water gun head and the vehicle body is detected in real time through the infrared distance measuring transmitter and the infrared distance measuring receiver, water pressure adjustment is achieved in combination with the variable-frequency water pump, automatic pressure reduction is achieved when the vehicle is close to the vehicle body, and vehicle paint is prevented from being damaged.

The present application provides a sensor capable of high-precision measurement with high SN ratio even when the ambient temperature changes, and a bandpass filter for the sensor. The sensor has a light source, a bandpass filter that extracts light of a peak wavelength of the light source, and a light-receiving element that receives the light extracted by the bandpass filter. The bandpass filter has a bandpass layer and a support that supports the bandpass layer. When the thermal expansion coefficient of the bandpass layer is α1, the elastic modulus is E1, the thermal expansion coefficient of the support is α2, and the elastic modulus is E2, α1 > α2 and E1 < E2 are satisfied.

The application discloses a kind of based on the optical wave parameter precision measurement method of cross polarization effect, comprising: step 1, the polarized light of polarization direction as horizontal direction is as incident light to be illuminated to dielectric, and cross polarization effect occurs when reflecting on dielectric interface;Step 2, make reflected light pass through the polarizer, and adjust the polarizer, the central light intensity of reflected light after passing through the polarizer becomes 0, and record the initial angle of the light transmission direction of polarizer and vertical direction at this time;Step 3, the physical quantity to be measured is introduced to incident light, then adjust the polarizer again, when the central light intensity of reflected light becomes 0, record the angle ψ of the change of polarizer from initial angle;Step 4, the change amount of incident light polarization direction after introducing the physical quantity to be measured is calculated according to ψ, and then the physical quantity to be measured is calculated.The optical wave parameter measurement method of the application is simple, low in cost, but the small change of the physical quantity to be measured can be accurately measured.

This invention relates to the field of stress measurement technology, specifically to a method for measuring wall shear stress based on an event camera and a micro-cylindrical sensor. This method is used to measure wall shear stress in a flow field and includes: setting the installation position of the micro-cylindrical sensor; setting the light threshold of the event camera; acquiring the pixel position of the bright spot at the top of the micro-cylindrical sensor and the position of the marker point on its substrate at the initial moment based on the event camera; acquiring the pixel position of the bright spot at the top of the micro-cylindrical sensor during operation; and obtaining the wall shear stress in the flow field based on the offset of the bright spot at the top of the micro-cylindrical sensor and the curve between the wall shear stress and the offset of the bright spot at the top of the micro-cylindrical sensor. This invention can significantly improve the detection efficiency of the micro-cylindrical sensor, avoid the problem of uneven LED lighting, and effectively avoid the post-processing difficulties caused by simultaneous illumination from the top and bottom of the micro-cylindrical sensor after lighting.

The application relates to a distributed optical fiber sensing system and discloses a fast measurement BOTDA sensing device based on chaotic light polarization orthogonal detection, which comprises a narrow-line-width laser; signals output by the narrow-line-width laser are divided into two paths: one path is used as injection light to enter a chaotic light generation module to make the module output chaotic light with a wide spectrum, the chaotic light is used as detection light and sequentially connected with one end of a sensing optical fiber after passing through an optical isolator, an electro-optic modulator, a polarization maintaining optical fiber and an erbium-doped fiber amplifier; the other path is used as pump light and sequentially connected with the other end of the sensing optical fiber after passing through a semiconductor optical amplifier and a first circulator; after polarization orthogonal detection light is transmitted to the other end of the sensing optical fiber, the polarization orthogonal detection light is output through a first circulator output end and is coherently detected and data processed by a coherent detection module to obtain a Brillouin gain spectrum of the sensing optical fiber along a line. The application can realize Brillouin gain sweep-free measurement and improve the measurement speed.

A kind of six-freedom absolute deformation measurement method of measuring platform based on single reference point measurement platform, with measuring platform as center, in the measured area, and with measuring platform as the other side of symmetry, reference point is arranged, laser displacement measuring instrument, camera and target are arranged on reference point;Camera is used to collect measuring platform target image on measuring platform;Target on reference point is used as feature recognition point;Two-dimensional inclination measuring instrument is arranged on measuring platform, measuring platform camera and measuring platform target;Measuring platform target is used for collecting image data by camera of reference point;The present application realizes real-time solution to six-freedom (three-dimensional translation+three-dimensional rotation) displacement of measuring platform by single reference point feature identification and measuring platform feature identification, to realize high-precision measurement to position change of measuring platform itself, so that measurement result is more accurate.

The application discloses a detection device and an electronic device. The detection device comprises: a driving unit driving a transmitting unit to transmit first and second modulated light beams; an iTOF unit receiving a first echo light signal of the first modulated light beam; a dTOF unit receiving a second echo light signal of the second modulated light beam; and a processing unit generating a detection strategy based on a first depth map generated by the first echo light signal: when the detection distance of the depth map is less than a first threshold, the driving unit drives the transmitting unit to continue transmitting the first modulated light beam to enable the iTOF unit to realize iTOF imaging; and when the detection distance is greater than or equal to the threshold, the driving unit drives the transmitting unit to transmit the second modulated light beam to enable the dTOF to realize dTOF imaging. The scheme determines the detection strategy through the corresponding detection result of the iTOF unit, ensures that the detection device realizes high-precision measurement in the full detection distance range, reduces energy consumption, and improves the near-distance high-reflection expansion of dTOF imaging.

The present application provides a small gas detection device capable of high-precision measurement. The gas detection device is provided with a light emitting portion (10), a light receiving portion (20), and a light guide portion (30) for guiding light from the light emitting portion (10) to the light receiving portion (20). The light guide portion (30) includes a mirror (50) having a shape of a part of a rotating ellipsoid, the mirror (50) being disposed at or near a first focal point of the rotating ellipsoid, the light emitting portion (10) and the light receiving portion (20) being disposed at or near focal points other than the first focal point of the rotating ellipsoid, respectively, and the light emitting portion (10) and the light receiving portion (20) being arranged in parallel with a major axis direction of the rotating ellipsoid.

The invention belongs to the technical field of core nuclear magnetic resonance measurement, and provides a mobile core nuclear magnetic resonance measurement method and system based on step length control, and the method comprises the steps: carrying out the calibration of different positions of a coil, and obtaining the calibration coefficients corresponding to the different positions of the coil through a moving stepping mode; after the coil is scaled, the core to be tested is moved to a coil signal acquisition area for testing according to a set step length based on a scale coefficient; during testing, the same stepping mode is kept in the scale process, T2 signals of the full-diameter to-be-tested rock cores at different length positions are obtained, and nuclear magnetic resonance data of the to-be-tested rock cores are obtained through data processing. By means of accurate driving of the stepping motor, errors caused by manual operation or mechanical instability in traditional measurement are eliminated, repeatability and consistency of measurement are greatly improved, and reliable guarantee is provided for subsequent data analysis.

The application discloses a lens detection device, which comprises a detection head vertically downwardly facing a to-be-detected lens, the to-be-detected lens is horizontally supported in a lens jig with an axial hollow, the lens jig is clamped in a fixed seat with an axial hollow, the fixed seat is installed on a fixed platform, the inside of the fixed platform is formed with a horizontal light path projection channel, one end of the light path projection channel is provided with a projection light pipe, and the other end is provided with a reflecting element, the reflecting element vertically upwardly reflects the horizontal light path projected by the projection light pipe, and sequentially passes through the fixed seat, the lens jig and the to-be-detected lens, and is received by the detection head to realize detection. The utility model discloses the structure when detecting the lens, is suitable for reflecting the lens simultaneously, and applies multiple displacement platforms to the moving structure of the detection device, and realizes relatively precise lens detection.

The invention discloses a spherical particle size measurement method and device based on a generative adversarial network and deep learning, and belongs to the field of particle measurement and image processing. The method comprises the following steps: acquiring a spherical particle interference fringe pattern acquired in an experiment and an ideal fringe pattern based on optical transmission matrix simulation; each image is labeled with a corresponding spherical particle size label; the simulation graph is converted into a simulation graph by using a CycleGAN network, and an expanded data set is constructed; combining the experiment diagram with the simulation diagram; the data set is used for training a pre-constructed size prediction model, the size prediction model takes an Ege-unet network as a basis, and a frequency domain attention module and a full connection layer are added to a coding and decoding layer and a network output layer respectively; and performing size prediction on an input image by using the trained size prediction model to realize measurement of spherical particles of any size. According to the method, the data generalization ability is enhanced through the generative adversarial network, and finally measurement of spherical particles of any size can be realized.

The invention discloses a real-time high-speed three-dimensional point cloud generation method and system based on laser triangulation ranging, and belongs to the technical field of three-dimensional measurement, and the method comprises the steps: building a vector field from image pixels to a three-dimensional space based on built-in calibration parameters of an integrated structure; performing dynamic differential analysis on the high-speed image flow, extracting a sub-pixel-level light stripe center and mapping the sub-pixel-level light stripe center into an initial three-dimensional point cloud in real time; consistency filtering is carried out on the flow type point cloud based on a space-time topological structure to remove noisy points; performing synchronous real-time compensation on a composite error caused by optical distortion, thermal drift and a dynamic attitude on the filtered point cloud, and outputting a point cloud with a locked pose; according to an encoder synchronization signal, incremental registration splicing is carried out on the continuous frame point clouds under kinematics constraints, a complete and consistent three-dimensional model is generated in real time, high-precision and high-stability real-time generation of the three-dimensional point clouds under a high-speed scanning condition is realized, and the problem that the speed and the precision are difficult to consider at the same time is solved.

A high-precision measuring device for high voltage mainly comprises a high-voltage attenuation and input protection module, a differential input and signal conditioning module and a high-precision measuring and processing module which are connected in sequence, and the high-voltage attenuation and input protection module is used for attenuating an input direct-current high-voltage signal to a low-voltage range capable of being processed by a subsequent circuit according to a preset proportion; the differential input and signal conditioning module is used for identifying and extracting a differential-mode voltage signal, namely an effective signal, between the two input ends, and greatly suppressing common-mode noise of the two input ends at the same time; and the high-precision measuring and processing module converts the differential analog signal into a single-ended signal through pre-stage conditioning, firstly performs high-precision voltage measurement, then performs analog-to-digital conversion, and finally uploads the single-ended signal to the processor through noise isolation. According to the device, a graded and reliable safety protection and anti-interference system is constructed, high-precision measurement of high voltage can be realized, and the highest 7.5-bit high-voltage measurement precision can be realized.

This invention relates to a focal plane consistency coefficient testing device for a fluorescence endoscopy system. It includes a fixed plate, a worktable mounted on the fixed plate, and a transmission light box. An endoscope with a camera is mounted on the worktable via a connector. The camera is secured to the endoscope with a clip. A focusing knob is provided on the camera for adjusting image sharpness. The endoscope is positioned directly opposite the transmission light box, and a test card is mounted above the transmission light box. This invention provides a focal plane consistency coefficient testing device for a fluorescence endoscopy system, which boasts advantages such as simple and reasonable structure, practicality, and convenience.

The invention provides a focusing ring height measuring system and method, and relates to the technical field of semiconductor manufacturing, and the system comprises a light source which is arranged on the surface of a wafer and emits a laser beam; the optical element is arranged on an emergent light path of the light source and is used for shaping the laser beam into a light spot projected to the inner side surface of a focusing ring; the image collector is used for collecting the light spots and generating image information; the control processing module is connected with the light source and the image collector and used for receiving the image information and processing the image information to obtain the height value of the focusing ring. The purpose of measuring the height of the focusing ring in a non-contact, in-situ and high-precision mode can be achieved, and particle pollution and electrostatic damage are prevented. The purpose of non-contact, in-situ and high-precision measurement of the height of the focusing ring can be achieved, and the measurement efficiency and the measurement precision are improved.

A kind of hydraulic support high-precision moving frame alignment positioning control method, (1) the adjacent two hydraulic supports are contacted each other, and the position of the hydraulic support is always constrained by its adjacent frame during moving frame;(2) displacement sensor is arranged in the base of hydraulic support;(3) first, the relative displacement between hydraulic supports is used as the basis to calculate the position information of each hydraulic support compared with the first frame, and the actual arrangement trajectory of hydraulic support is obtained;Then, the ideal trajectory of next moving frame and the moving distance of each hydraulic support needed to compensate straightness are calculated with the position of the most lagged hydraulic support as reference, finally, the moving distance of each hydraulic support should be calculated and moving frame action is completed in combination with the moving frame step distance set in advance, and the dynamic alignment of hydraulic support is realized during moving frame process.The present application makes the adjacent two supports keep direct contact, and controls the alignment and positioning of hydraulic support, avoids the problem of inconsistent moving frame direction angle caused by independent hydraulic supports.

The invention belongs to the technical field of industrial measurement, and particularly relates to a code band position and speed identification method and system. The method comprises the following steps: constructing and storing a standard coding model adaptive to a current identification program; carrying out continuous light beam scanning sampling on the code band according to a preset sampling period, collecting a light intensity change signal representing the physical structure of the code band, and converting the light intensity change signal into a discretized one-dimensional time sequence photoelectric signal; preprocessing the one-dimensional time sequence photoelectric signal; a continuous sampling frame matching mode with a multistage filtering fault-tolerant mechanism is adopted, the preprocessed one-dimensional time sequence photoelectric signal is compared with a standard coding model, and the absolute position and the accurate position of a current scanning section in a code band are determined; and calculating the running speed of the moving target based on the displacement variation of the matching result of the continuous sampling frames and the sampling period. According to the invention, the problems of insufficient adaptation flexibility, poor stability in a complex environment and weak anti-interference capability of the existing code band detection system can be solved.