scholarly journals A Fast Laser Adjustment-Based Laser Triangulation Displacement Sensor for Dynamic Measurement of a Dispensing Robot

2020 ◽  
Vol 10 (21) ◽  
pp. 7412
Author(s):  
Zhuojiang Nan ◽  
Wei Tao ◽  
Hui Zhao ◽  
Na Lv
Keyword(s):  
Least Square ◽  
Displacement Sensor ◽  
Step Response ◽  
Laser Triangulation ◽  
Stable Operation ◽  
Difference Threshold ◽  
Laser Sensor ◽  
Height Measurement ◽  
Peak Intensity ◽  
Laser Adjustment

Height measurement and location by a laser sensor is a key technology to ensure accurate and stable operation of a dispensing robot. In addition, alternation of dynamic and static working modes of a robot, as well as variation of surface and height of a workpiece put forward strict requirements for both repeatability and respond speed of the location system. On the basis of the principle of laser triangulation, a displacement sensor applied to a dispensing robot was developed, and a fast laser adjustment algorithm was proposed according to the characteristics of static and dynamic actual laser imaging waveforms on different objects. First, the relationship between the centroid position of static waveform and peak intensity for different measured objects was fitted by least square method, and the intersection point of each curve was solved to confirm the ideal peak intensity, and therefore reduce the interference of different measured objects. Secondly, according to the dynamic centroid difference threshold of two adjacent imaging waveforms, the static and dynamic working modes of the sensor were distinguished, and the peak intensity was adjusted to different intervals by linear iteration. Finally, a Z direction reciprocating test, color adaptability test, and step response test were carried out on the dispensing robot platform; the experiments showed that the repeatability accuracy of the sensor was 2.7 um and the dynamic step response delay was 0.5 ms.

Solar Tracking Device Based on Electronic Compass and Accelerometer

2014 ◽  
Vol 981 ◽  
pp. 522-525 ◽  
Author(s):  
Zhong Ran Zhang ◽  
Yuan Ma ◽  
Bo Jiao ◽  
Tong Liang Liu
Keyword(s):  
Elevation Angle ◽  
Least Square Method ◽  
Least Square ◽  
Stable Operation ◽  
Solar Tracking ◽  
High Flexibility ◽  
Tracking Device ◽  
Solar Position ◽  
Electronic Compass ◽  
The Magnetic Field

A solar tracking device was designed in this paper. First, In order to determine the initial direction of the mechanism and the east, HMC5883L was used for measuring the magnetic field of earth. Then, the mechanism began to operate according to the solar position which was confirmed though the astronomical calculation. Finally, the azimuth and the elevation angle of solar were measured and corrected by HMC5883L and MPU6050 respectively. HMC5883L was calibrated by the ellipse fitting, which was obtained though the least square method. The horizontal error of HMC5883L was compensated. The experimental study was performed. And the results show that the solar tracking device has the characteristics of stable operation, high flexibility and low requirement of installation precision.

Design and Implementation of High Precision Online Thickness Gauge by Laser Displacement Sensor

2014 ◽  
Vol 568-570 ◽  
pp. 331-335
Author(s):  
Ping He ◽  
Meng Wang ◽  
Chao Liu ◽  
Ying Li
Keyword(s):  
High Precision ◽  
Steel Industry ◽  
High Reliability ◽  
Displacement Sensor ◽  
Laser Sensor ◽  
Thickness Gauge ◽  
Laser Displacement Sensor ◽  
Steel Rolling ◽  
X Ray ◽  
Ultrasonic Thickness

Steel rolling occupies a very important position in the iron and steel industry. The thickness of the steel plate is a crucial index of the quality, so the automatic detection system for high-precision thickness of the steel industry has a vital significance. The traditional thickness instruments have X-ray thickness gauge and ultrasonic thickness meter while the X-ray thickness gauge has radiation which is harmful to human body and ultrasonic thickness has a lower precision. For these shortcomings, a high precision thickness gauge by laser sensor was designed. Presented the differential measurement method based on laser displacement sensor. Then using TMS320F2812 as main control chip designed the hardware of the system. Finally, software programming was completed based on the hardware design. By experiment research, the results show that the laser thickness gauge has advantages of high precision and high reliability. It has a high practical value.

A Height Measurement Based on Laser Triangulation Probe and a Two Dimensional Image Measurement System for Smart Manufacturing

2015 ◽  
Vol 764-765 ◽  
pp. 1324-1328
Author(s):  
Pen Han Chen ◽  
Chien Hung Liu ◽  
Yu Fen Chen ◽  
Hung Sheng Chiu ◽  
Yu Chi Liu
Keyword(s):  
Measurement System ◽  
Smart Manufacturing ◽  
Measuring Error ◽  
Laser Triangulation ◽  
Two Dimensional ◽  
Image Measurement ◽  
Height Measurement ◽  
Dimensional Image ◽  
Two Dimensional Image ◽  
Auto Focusing

This paper integrated a laser triangulation probe with a two-dimensional image measurement system to measure the height of an object using the auto-focusing method. In the laser triangulation probe, the laser diode was used as the light source and one-dimensional position sensitive detector was adopted to receive the position of the laser spots to detect the height. The laser triangulation probe was used for small height measurement and the auto-focusing method was used for large height measurement. Two standard gauges with thicknesses of 8mm and 8.5mm were used to verify our proposed method. With height difference of 500μm, the experiment results showed the measuring error was within ±3μm and standard deviation was about 0.1μm.

Error Calibration System for Time Grating Angular Displacement Sensor

2013 ◽  
Vol 662 ◽  
pp. 705-708
Author(s):  
Zhong Hua Gao
Keyword(s):  
Angular Displacement ◽  
Least Square Method ◽  
Least Square ◽  
Displacement Sensor ◽  
Calibration System ◽  
Displacement Sensors ◽  
Optical Grating ◽  
Calibration Algorithm ◽  
Error Calibration ◽  
Angular Displacements

A calibration system was developed for time grating angular displacement sensors to calibrate errors of this type of sensor. In the system, the motor was controlled by ARM processor according to the setting value coming from the USB port of the computer, and therefore the motor outputted angular displacement values. Meanwhile, with the motor turning, the optical grating, which was used as the criterion instrument, and time grating turned together corresponding angular displacements. Several displacement values from a circle of sensors of time grating and optical grating were sent to computer by serial port to be processed. Furthermore, an error calibration algorithm, which was based on the least square method (LMS), was used in this calibration system. The precise of time grating can reach to ±0.7″after calibrating using this algorithm and the process of error calibration can be automatically made by the computer.

scholarly journals Analysis of the Displacement of Thin-Walled Workpiece Using a High-Speed Camera during Peripheral Milling of Aluminum Alloys

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4771
Author(s):  
Jakub Czyżycki ◽  
Paweł Twardowski ◽  
Natalia Znojkiewicz
Keyword(s):  
Aluminum Alloys ◽  
High Speed ◽  
Cutting Parameters ◽  
Displacement Sensor ◽  
Laser Sensor ◽  
High Speed Camera ◽  
The Finite Element Method ◽  
Peripheral Milling ◽  
Thin Walled ◽  
Theoretical Results

The paper presents the possibilities of a high-speed camera in recording displacements of thin-walled workpiece during milling made of aluminum alloys, which allowed for an analysis in which it was compared to other methods of testing the deflection of such elements. The tests were carried out during peripheral milling with constant cutting parameters. Deflection of thin-walled workpiece due to cutting forces was measured using a high-speed camera and a laser displacement sensor. Additionally, the experimental results were compared with the theoretical results obtained with the use of the finite element method. The research proved the effectiveness of the use of high-speed camera in diagnostics of thin-walled workpieces during milling with an accuracy of up to 11% compared to measurements made with a displacement laser sensor.

Irradiance distribution model for laser triangulation displacement sensor and parameter optimization

2019 ◽  
Vol 58 (09) ◽  
pp. 1
Author(s):  
Hongwei Yang ◽  
Wei Tao ◽  
Kaimei Liu ◽  
Yassine Selami ◽  
Hui Zhao
Keyword(s):  
Parameter Optimization ◽  
Displacement Sensor ◽  
Distribution Model ◽  
Laser Triangulation

scholarly journals An improved MPPT control strategy based on incremental conductance algorithm

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Liqun Shang ◽  
Hangchen Guo ◽  
Weiwei Zhu
Keyword(s):  
Control Strategy ◽  
External Environment ◽  
Weather Conditions ◽  
Response Speed ◽  
Step Response ◽  
Stable Operation ◽  
Pv System ◽  
Radiation Level ◽  
Incremental Conductance ◽  
Incremental Conductance Algorithm

Abstract PV power production is highly dependent on environmental and weather conditions, such as solar irradiance and ambient temperature. Because of the single control condition and any change in the external environment, the first step response of the converter duty cycle of the traditional MPPT incremental conductance algorithm is not accurate, resulting in misjudgment. To improve the efficiency and economy of PV systems, an improved incremental conductance algorithm of MPPT control strategy is proposed. From the traditional incremental conductance algorithm, this algorithm is simple in structure and can discriminate the instantaneous increment of current, voltage and power when the external environment changes, and so can improve tracking efficiency. MATLAB simulations are carried out under rapidly changing solar radiation level, and the results of the improved and conventional incremental conductance algorithm are compared. The results show that the proposed algorithm can effectively identify the misjudgment and avoid its occurrence. It not only optimizes the system, but also improves the efficiency, response speed and tracking efficiency of the PV system, thus ensuring the stable operation of the power grid.

scholarly journals The laser beamline in SULF facility

2020 ◽  
Vol 8 ◽  
Author(s):  
Zongxin Zhang ◽  
Fenxiang Wu ◽  
Jiabing Hu ◽  
Xiaojun Yang ◽  
Jiayan Gui ◽  
...  
Keyword(s):  
Peak Power ◽  
Contrast Ratio ◽  
Laser Pulses ◽  
Stable Operation ◽  
Chirped Pulse ◽  
Peak Intensity ◽  
Laser Facility ◽  
Chirped Pulse Amplification ◽  
Maximal Peak ◽  
Laser Condition

In this paper, we report the recent progress on the $1~\text{PW}/0.1~\text{Hz}$ laser beamline of Shanghai Superintense Ultrafast Laser Facility (SULF). The SULF-1 PW laser beamline is based on the double chirped pulse amplification (CPA) scheme, which can generate laser pulses of 50.8 J at 0.1 Hz after the final amplifier; the shot-to-shot energy fluctuation of the amplified pulse is as low as 1.2% (std). After compression, the pulse duration of 29.6 fs is achieved, which can support a maximal peak power of 1 PW. The contrast ratio at $-80~\text{ps}$ before main pulse is measured to be $2.5\times 10^{-11}$ . The focused peak intensity is improved by optimizing the angular dispersion in the grating compressor. The maximal focused peak intensity can reach $2.7\times 10^{19}~\text{W}/\text{cm}^{2}$ even with an $f/26.5$ off-axis parabolic mirror. The horizontal and vertical angular pointing fluctuations in 1 h are measured to be 1.89 and $2.45~\unicode[STIX]{x03BC}\text{rad}$ , respectively. The moderate repetition rate and the good stability are desirable characteristics for laser–matter interactions. The SULF-1 PW laser beamline is now in the phase of commissioning, and preliminary experiments of particle acceleration and secondary radiation under 300–400 TW/0.1 Hz laser condition have been implemented. The progress on the experiments and the daily stable operation of the laser demonstrate the availability of the SULF-1 PW beamline.

System Identification of a Class of Second-Order Continuous System

2014 ◽  
Vol 651-653 ◽  
pp. 528-533 ◽  
Author(s):  
Zhi Gang Jia ◽  
Xing Xuan Wang
Keyword(s):  
Linear Equations ◽  
Continuous System ◽  
Least Square Method ◽  
Second Order ◽  
Least Square ◽  
Step Response ◽  
Order System ◽  
Simulation Results ◽  
Order Continuous ◽  
Identification Model

An identification method of a class of second-order continuous system is proposed. This method constructs a discrete-time identification model, forms a set of linear equations. The parameters can be obtained by least square method. Simulation results show that the method is effective for a class of second-order system, and is not only for step response but also for square wave signal.

Measuring Coaxiality with Optoelectronic and Non-Contact Based on Helical Scanning

2012 ◽  
Vol 588-589 ◽  
pp. 1002-1005
Author(s):  
Qi Fang Liu
Keyword(s):  
Relative Motion ◽  
Servo System ◽  
Automatic Testing ◽  
Feasibility Analysis ◽  
Laser Triangulation ◽  
Laser Sensor ◽  
Spiral Scanning ◽  
Simulation Results ◽  
Helical Scan ◽  
The Way

In view of the characteristic of the inefficiency on measuring coaxiality manually in industry, we put forward to studying on a laser triangulation san method[1] for measuring distance to measure coaxiality. It takes relative motion between the measurement thing and displacement laser sensor to implement helical scan motion and gain the data of spiral scanning projection based on step servo system by gyration and the axial feed. This method can improve manufacture efficiency and achieve the demand of online automatic testing. Finally, the way of implementation of this system would be discussed in this paper, meanwhile, it would provide simulation results of the method and actually feasibility analysis .

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