10 results about "Laser doppler velocimeter" patented technology

The utility model discloses a kind of dynamic steel billet laser doppler measuring devices of follow-up, including conveying roller, the inner wall left side of conveying roller is equipped with measuring hole, the left side of conveying roller is fixedly installed with linear displacement rod, the upper movable mounting of linear displacement rod has moving platform, the upper fixed mounting of moving platform has laser doppler velocimeter sensor, first position sensor and second position sensor, the left side of linear displacement rod is fixedly installed with servo motor, the output end fixed mounting of servo motor has adjusting screw rod.The utility model actively adapts to the position change of steel billet, reduces the requirement to the running stability of steel billet, expands the applicable scenario of laser doppler velocimeter sensor, to realize the length measurement of continuous, stable, high-precision to the steel billet that exists swing or bending;It provides accurate length and positioning information for automatic sawing and subsequent process, help to improve product size qualification rate and yield rate.

The present application relates to a kind of continuous elevation measurement method and system based on SINS / LDV combination, belong to geodetic survey field.The system includes strapdown inertial navigation system, laser doppler velocimeter, UPS power supply and navigation computer, wherein, the angular motion and linear motion of sensitive carrier are used to strapdown inertial navigation system;Strapdown inertial navigation system is connected with laser doppler velocimeter and navigation computer respectively;Laser doppler velocimeter is connected with navigation computer, and UPS power supply is connected with strapdown inertial navigation system and laser doppler velocimeter respectively;In order to improve the precision of elevation measurement, the output of laser doppler velocimeter is triggered with the pulse output of strapdown inertial navigation system as benchmark, to prevent the data loss phenomenon caused by the inconsistency of internal crystal oscillator of strapdown inertial navigation system and laser doppler velocimeter.

The application discloses an unmanned mine truck sliding distance laser measuring device and a measuring method, and belongs to the technical field of mine truck detection. The unmanned mine truck sliding distance laser measuring device and the measuring method, which belong to the technical field of mine truck detection, comprise a mine truck with a first mounting hole, and a second clamping plate and a first clamping plate are arranged at the upper and lower ends of the outer side of the first mounting hole, respectively. The application solves the problem that the additional scale plate needs to be laid on a relatively flat position close to the subsequent moving position of the mine truck during detection, and the efficiency is low and the accuracy is poor. After the second clamping plate and the first clamping plate are clamped and fixed, the laser Doppler velocimeter can be unfolded by rotating the second adjusting frame, the unfolded laser Doppler velocimeter can be adjusted in angle by rotating around the connecting roller as the center, the installation position is adapted, and different installation positions and installation heights can be adjusted and adapted during the unfolding process.

The invention provides a laser Doppler velocity measurement device based on a multi-core optical fiber and a vortex light field, and belongs to the technical field of vortex light field velocity measurement. The system comprises a laser, an optical splitter, a phase modulator, a multi-core optical fiber fan-in and fan-out device, a multi-core optical fiber, a gradient refractive index lens, an optical beam splitter, a photoelectric detector, an analog-to-digital converter, an upper computer, a controller and a driving circuit, the optical path design is simplified, direct generation of vortex light is achieved through the multi-core optical fiber, the optical path design is simplified, and the power consumption is reduced. The Doppler probe is formed by the gradient refractive index lens and the multi-core optical fiber, the light beam focusing characteristic is optimized, the quality of a vortex light field is ensured, meanwhile, the flexibility of a system is improved, the advantages of being compact in structure, high in integration level and high in precision are achieved, a stable vortex field can be formed at the position with the short emitting distance, and the requirement for the working environment is lowered. And a more efficient solution is provided for measuring the speed of the compound motion.

The utility model discloses a connecting mechanism frame of a film drawing machine and a coating machine. The connecting mechanism frame comprises a carrier roller frame, an optical axis, an aluminum guide roller, a heightened belt vertical type seat bearing, a deep groove ball bearing, a shaft fixing ring and a tension controller. The aluminum guide roller is concentrically installed on the optical shaft, the optical shaft is connected with the heightening belt vertical type seat bearing, the heightening belt vertical type seat bearing is installed on the carrier roller frame cross beam, and the tension controller is installed on the carrier roller frame stand column. The deep groove ball bearings are installed on the two sides of the aluminum guide roller, and the shaft fixing rings are installed on the outer sides of the deep groove ball bearings. According to the utility model, the film drawing machine and the coating machine are connected, so that the integration of front and back procedures of product production is realized, the production efficiency can be improved, and the yield can be improved. In addition, two systems of the laser Doppler velocimeter and the tension controller are introduced and can verify each other, and when data are abnormal, an alarm can be given out through the PLC.

FIELD: production of linear products.SUBSTANCE: production of linear products by drawing, rolling, extrusion, twisting, layering, methods and devices for contactless monitoring of surface defects. Claimed device comprises a horseshoe-shaped housing mounted on a telescopic stand with the ability to be folded out of the working area by means of a hinge with light sources, video cameras and a laser Doppler velocimeter installed in it, a switch, a computer, a switch for connecting to a corporate network, a light and sound signaling unit, a connection unit with a process line, a connection unit with peripheral devices in the form of a printer and a marking machine, a mouse, a keyboard, a touch screen and software for collecting, processing and displaying information.EFFECT: increase in the accuracy of defect detection, determination of the geometric dimensions of the body, monitoring of the surface of the working body from all sides in a plane perpendicular to the direction of movement of the working body, creation of the possibility of introducing and removing the control and measuring system from the measurement zone without stopping the technological process and determining the coordinates of the detected defect along the length of the inspected working body.16 cl, 6 dwg

The application belongs to the technical field of integrated navigation and relates to a two-dimensional Doppler velocimeter calibration method and device, computer equipment and medium. The method comprises the following steps: obtaining relevant parameters of a two-dimensional laser Doppler velocimeter to obtain error velocity of the two-dimensional laser Doppler velocimeter in its own coordinate system; converting the error velocity to a carrier coordinate system and then to a navigation coordinate system to obtain error velocity in the navigation coordinate system, and then obtaining an error model of the two-dimensional laser Doppler velocimeter; constructing an error model of a strapdown inertial navigation system; constructing a Kalman filter, taking the global positioning system as a reference, taking the velocity error, position error of the strapdown inertial navigation system and the velocity error of the two-dimensional laser Doppler velocimeter in the navigation coordinate system as observation quantities, estimating the state vector of the integrated navigation system and calibrating it. The method is not limited by the directions of the two beams of the two-dimensional laser Doppler velocimeter.

The application belongs to the technical field of integrated navigation and relates to a loosely coupled land integrated navigation method, device, computer equipment and medium. The method comprises the following steps: acquiring the wavelength of a two-dimensional laser Doppler velocimeter, the Doppler frequency shift of each of a first light beam and a second light beam and the design inclination angle of each of the first light beam and the second light beam, obtaining the error speed of the two-dimensional laser Doppler velocimeter in its own coordinate system; converting the error speed to a carrier coordinate system and then to a navigation coordinate system to obtain the error speed in the navigation coordinate system and then obtain the measurement model of the integrated navigation system; constructing an error model of a strapdown inertial navigation system; constructing a Kalman filter, estimating the state vector of the integrated navigation system and performing navigation. The method can provide the forward speed and the skyward speed of the carrier based on the two-dimensional laser Doppler velocimeter and the strapdown inertial navigation system to form a land integrated navigation system.

The application belongs to the technical field of integrated navigation, and relates to a tightly coupled land integrated navigation method, device, computer equipment and medium. The method comprises the following steps: obtaining related parameters of a two-dimensional laser Doppler velocimeter, and obtaining a conversion matrix of a two-dimensional laser Doppler velocimeter coordinate system and a beam coordinate system; obtaining an output speed of a strapdown inertial navigation system in a navigation coordinate system, and obtaining an output speed of the strapdown inertial navigation system in the two-dimensional laser Doppler velocimeter coordinate system; obtaining an output speed of the strapdown inertial navigation system in the beam coordinate system according to the conversion matrix and the output speed of the strapdown inertial navigation system in the two-dimensional laser Doppler velocimeter coordinate system; constructing a Kalman filter, taking a difference between the output speed of the strapdown inertial navigation system in the beam coordinate system and a speed of the two-dimensional laser Doppler velocimeter in the beam direction as a filter observation, estimating a state vector of the integrated navigation system, and navigating. The method improves the robustness of the integrated navigation system.

This application relates to an online calibration method and apparatus for a laser Doppler velocimeter based on position observation. The method divides the calibration process into two stages: coarse calibration and fine calibration. In the coarse calibration stage, an analytical method is employed. In the fine calibration stage, a robust Kalman filter is first designed to obtain accurate carrier attitude, velocity, and position information. Then, another Kalman filter is designed using the error propagation model of the laser Doppler velocimeter based on position observation to further calibrate the laser Doppler velocimeter. To reduce the impact of non-holonomic constraints being violated during vehicle turning on the calibration results, the output of an astrogyroscope and the output velocity of the laser Doppler velocimeter are used to distinguish whether the vehicle is changing direction, and lateral velocity compensation is performed on the laser Doppler velocimeter's velocity in its own coordinate system when the vehicle changes direction. This method significantly improves the robustness of the laser Doppler velocimeter during the calibration process.