scholarly journals Compact Laser Collimation System for Simultaneous Measurement of Five-Degree-of-Freedom Motion Errors

2020 ◽  
Vol 10 (15) ◽  
pp. 5057
Author(s):  
Chuang Sun ◽  
Sheng Cai ◽  
Yusheng Liu ◽  
Yanfeng Qiao
Keyword(s):  
Simultaneous Measurement ◽  
Measurement Accuracy ◽  
Measurement Data ◽  
Optical Path ◽  
Degree Of Freedom ◽  
Experimental Setup ◽  
Collimation System ◽  
Optical Configuration ◽  
Series Of Experiments ◽  
The Common

A compact laser collimation system is presented for the simultaneous measurement of five-degree-of-freedom motion errors. The optical configuration of the proposed system is designed, and the principle of the measurement of five-degree-of-freedom errors is described in detail. The resolution of the roll and the horizontal straightness is doubled compared with other laser collimation methods. A common optical path compensation method is provided to detect light drift in real time and compensate for straightness and angle errors. An experimental setup is constructed, and a series of experiments are performed to verify the feasibility and stability of the system. Compared with commercial instruments, the pitch and yaw residuals are ± 2.5 ″ and ± 3.5 ″ without correction, and the residuals are ± 1.9 ″ and ± 2.8 ″ after correction, respectively. The comparison deviations of the horizontal straightness and vertical straightness changed from ± 4.8   μ m to ± 2.8 μm and ± 5.9 μm to ± 3.6 μm, respectively. The comparison deviation of the roll is ± 4.3 ″ . The experimental results show that the data of the five-degree-of-freedom measurement system obtained are largely the same as the measurement data of commercial instruments. The common optical path compensation can effectively improve the measurement accuracy of the system.

Research on Environment Materials with Soot Position Influence on SO2 Concentration Measurement

2014 ◽  
Vol 540 ◽  
pp. 251-254
Author(s):  
Yan Jun Zhao ◽  
Cheng Bin Gao ◽  
Bin Qu
Keyword(s):  
Light Intensity ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Measurement Data ◽  
Concentration Measurement ◽  
So2 Emission ◽  
Pollutant Sources ◽  
The Common ◽  
Atmosphere Environment ◽  
So2 Concentration

The pollutant gaseous SO2 concentration is one of the most important parameters in national atmosphere environment monitoring system with properties of environment materials. SO2 emission can be calculated through measuring SO2 concentration. The common SO2 concentration measurement method of the stationary pollutant sources is NDIR. Soot in duct can absorb the measurement light intensity and the different acceptance light intensity of the receiver is caused by soot different position, so the attenuation of SO2 measurement light intensity is increased and the SO2 emission concentration measurement data is error. The different soot position interference is studied in this paper. Simulation results show that soot difference position can interference SO2 concentration measurement accuracy. The experiment is carried on. The experiment result shows that the measurement method can on-time obtains the soot different position interference and decreases SO2 concentration measurement error.

Development of a Laser Based Dual-Axial Five-Degrees-of-Freedom Measurement System for an X-Y Stage

2006 ◽  
Author(s):  
Wen-Yuh Jywe ◽  
Chien Hung Liu ◽  
Yun-Feng Teng ◽  
Chun-Jen Chen ◽  
Jing-Chung Shen ◽  
...  
Keyword(s):  
Measurement System ◽  
Simultaneous Measurement ◽  
Degrees Of Freedom ◽  
Laser Interferometer ◽  
Optical Path ◽  
Degree Of Freedom ◽  
Position Errors ◽  
The One ◽  
Three Degree Of Freedom ◽  
Error Verification

This paper presents a new precision multi-DOF measurement system which has been developed and implemented for the simultaneous measurement of 5DOF motion errors (two linear positions, as well as pitch, roll and yaw) of an X-Y stage. In this paper, the 3DOF laser interferometer was produced by designing the optical path from the one-degrees-of-freedom laser interferometer. The system employs two three-degree-of-freedom interferometers to detect two position errors and three angular errors of the X-Y stage. The experimental setups and measuring procedure and a systematic calculated method for the error verification are presented in the paper. The resolution of measuring the angular errors component is about 0.055 arcsec.

Numerical investigation on a melt-blowing die with internal stabilizers

2019 ◽  
pp. 152808371986693 ◽  
Author(s):  
Changchun Ji ◽  
Yudong Wang ◽  
Yafeng Sun
Keyword(s):  
Average Velocity ◽  
Fiber Diameter ◽  
Measurement Data ◽  
Melt Blowing ◽  
One Dimensional ◽  
Temperature Decay ◽  
Slot Die ◽  
The Common ◽  
The One ◽  
Peak Value

In order to decrease the fiber diameter and reduce the energy consumption in the melt-blowing process, a new slot die with internal stabilizers was designed. Using computational fluid dynamics technology, the new slot die was investigated. In the numerical simulation, the calculation data were validated with the laboratory measurement data. This work shows that the new slot die could increase the average velocity on the centerline of the air-flow field by 6.9%, compared with the common slot die. Simultaneously, the new slot die could decrease the back-flow velocity and the rate of temperature decay in the region close to the die head. The new slot die could reduce the peak value of the turbulent kinetic energy and make the fiber movements more gradual. With the one-dimensional drawing model, it proves that the new slot die has more edge on the decrease of fiber diameter than the common slot die.

Detection and Analysis of Rats’ Bioelectromagnetic Signal

2014 ◽  
Vol 536-537 ◽  
pp. 13-17
Author(s):  
Hong Long Cao ◽  
Fen Ju Qin ◽  
Xue Guan Liu ◽  
He Ming Zhao
Keyword(s):  
Standard Deviation ◽  
Automatic System ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Biological Activities ◽  
Measurement Data ◽  
Measured Data ◽  
The Mean ◽  
Frequency Window ◽  
Window Effects

In this paper, we designed an automatic system and automatic test software, and they can carry out Kunming rats bioelectromagnetic measurement in standard status and anesthesia automatically in anechoic chamber where the electromagnetic field outside is shielded, the reflection wave is absorbed, and the measurement accuracy will be improved. We get a great number of measurement data with frequency-sweep measurement method. The mean and standard deviation of amplitudes vs. frequencies is calculated and analyzed. The results show the measurement method is feasible. We have plotted the means of measured data as multiple sets of Y values in a series of bars with standard deviations bars included and distributed in the frequency axis of X. It is found that the fluctuation of the mean and standard deviation in some frequencies is not evident which may explain frequency window effects, while in other frequencies, such a fluctuation can be obviously observed, which may suggest that bioelectromagnetic signal is influenced by biological activities (standard and anaesthesia status) in these frequency points.

The Development of Extremely-Compact Static Pressure Probe for the Simultaneous Measurement of Pressure and Velocity in the Turbulent Flows

2011 ◽  
Author(s):  
Kazuhiro Onishi ◽  
Osamu Terashima ◽  
Yasuhiko Sakai ◽  
Kouji Nagata
Keyword(s):  
Turbulent Flows ◽  
Simultaneous Measurement ◽  
Measurement Accuracy ◽  
Static Pressure ◽  
Pressure Tube ◽  
Pressure Probe ◽  
External Diameter ◽  
Space Resolution ◽  
Mems Microphone ◽  
Yaw Angle

A new static pressure probe was developed to improve the space resolution and the measurement accuracy of the combined probe for the simultaneous measurement of the static pressure and the velocity in turbulent flows. The external diameter of the static pressure tube is 0.3 mm and its internal diameter is 0.2 mm. There are 8 static pressure holes on the wall of the static pressure tube and their diameters are 0.1 mm. The MEMS microphone is used as the pressure sensor and embedded inside the flare of the static pressure tube. The diameter of the MEMS microphone is 2.54 mm and has the wide range flat frequency response. The measurement results by the new static pressure probe in the two-dimensional turbulent jet show that the measurement accuracy of the static pressure probe is sufficient and the seven-thirds power law is clearly observed in the power spectra of the fluctuating pressure measured at the position of a half width of the mean velocity distribution in the cross-streamwise direction apart from the jet center line. In addition, the yaw angle characteristics of this new pressure probe shows that the measurement accuracy of the static pressure has less dependency on the yaw angle of the probe to the flow direction than the one of the previous static pressure tube (its external diameter is 0.5 mm). From these results, it is found that the new static pressure probe is effective for the measurement of static pressure in turbulent flows and useful to improve the space resolution and the measurement accuracy of the combined probe for the simultaneous measurement of the velocity and the static pressure. By using this static pressure tube, the space resolution of the combined probe is reduced approximately 40%. Further, by combing two X-type hot-wire probes with the new pressure probe, the simultaneous measurement of three velocity components and static pressure is realized.

Study on the Engine Speed Sensor Position Measuring Tool Based on Minitab

2013 ◽  
Vol 456 ◽  
pp. 211-215
Author(s):  
Wu Cen ◽  
Li Xia Xia
Keyword(s):  
Measurement Accuracy ◽  
Engine Speed ◽  
Measurement Data ◽  
Measuring Method ◽  
Speed Sensor ◽  
Sensor Position ◽  
Accuracy Of Measurement ◽  
Repeatability And Reproducibility ◽  
Measuring Tool ◽  
Engine Size

Research on key position speed sensor of automobile engine size measuring tool as an example, for studying the optimization of measuring tools through use the powerful Minitab software statistics, analysis and calculation functions. Randomly selected 10 parts as a measurement sample, then obtained the measurement data by experiment. Analysis of the measured data with Minitab and calculate the repeatability and reproducibility of the device. Find the causes of failure in measuring and explore how to optimize the measuring method. Improved measuring clamp structure, and through experiments verify its feasibility. Thereby solving the problem of measuring failure to ensure the accuracy of measurement data, and improve the measurement accuracy of the product.

The Analysis and Design of a Large Stroke with High-Precision Polarized Laser Interferometer System

2016 ◽  
Vol 679 ◽  
pp. 129-134
Author(s):  
Wan Duo Wu ◽  
Qiang Xian Huang ◽  
Chao Qun Wang ◽  
Ting Ting Wu ◽  
Hong Xie
Keyword(s):  
High Precision ◽  
Measurement Accuracy ◽  
Laser Interferometer ◽  
Laser Interferometry ◽  
Phase Shifting ◽  
Single Frequency ◽  
Rejection Method ◽  
The Common ◽  
Frequency Laser ◽  
Polarization Phase

The technique utilizing single-frequency laser interferometry has very high measurement accuracy, but it has rigorous requirements for optical design which is affected by many factors. In order to achieve single-frequency laser interferometry with large stroke and high precision, the integral layout, the polarization phase shifting technique and the common mode rejection method are adopted to design the length interferometry system. This paper analyzes factors and design requirements which affect measurement accuracy with large stroke. Based on polarization phase shifting technique, the system employs the four-beam-signal detection technique and the common mode rejection method, to make a differential processing of four mutually orthogonal signals. Thus, the influences of zero-drift of intensity and environmental change on system are reduced. Combined with a 200 phase subdivision, the system achieves the resolution with 0.8 nm. Under the VC++ environment, the displacement measurement results are compensated and corrected according to the environmental parameters. Compared with the Renishaw XL-80 laser interferometer, the system has better stability in short term. In the measuring range of 60 mm, the effectiveness of the system is verified.

Ground mobile Bennett mechanism

2019 ◽  
Vol 43 (1) ◽  
pp. 69-79 ◽  
Author(s):  
Zhirui Wang ◽  
Yan-an Yao ◽  
Chao Liu
Keyword(s):  
Weight Distribution ◽  
Degree Of Freedom ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Dynamic Analyses ◽  
Constant Direction ◽  
Moving Direction ◽  
Series Of Experiments

This paper presents a novel application of the well-known single degree of freedom Bennett mechanism. By optimizing the link’s shape and the weight distribution of the Bennett mechanism, we put forward a ground mobile mechanism that can move in a constant direction and change its moving direction with only one actuator. A type of tumbling gait is proposed and kinematic and dynamic analyses of the gait are carried out. Finally, a series of experiments are performed on a manufactured prototype. The results verify the tumbling gait and functionality of the mobile mechanism.

Experimental Forced Response Analysis of Two-Degree-of-Freedom Piecewise-Linear Systems With a Gap

2020 ◽  
Author(s):  
Akira Saito ◽  
Junta Umemoto ◽  
Kohei Noguchi ◽  
Meng-Hsuan Tien ◽  
Kiran D’Souza
Keyword(s):  
Piecewise Linear ◽  
Excitation Frequency ◽  
Forced Response ◽  
Degree Of Freedom ◽  
Linear Oscillator ◽  
Phase Portraits ◽  
Response Analysis ◽  
Experimental Setup ◽  
The Masses ◽  
Two Degree Of Freedom

Abstract In this paper, an experimental forced response analysis for a two degree of freedom piecewise-linear oscillator is discussed. First, a mathematical model of the piecewise linear oscillator is presented. Second, the experimental setup developed for the forced response study is presented. The experimental setup is capable of investigating a two degree of freedom piecewise linear oscillator model. The piecewise linearity is achieved by attaching mechanical stops between two masses that move along common shafts. Forced response tests have been conducted, and the results are presented. Discussion of characteristics of the oscillators are provided based on frequency response, spectrogram, time histories, phase portraits, and Poincaré sections. Period doubling bifurcation has been observed when the excitation frequency changes from a frequency with multiple contacts between the masses to a frequency with single contact between the masses occurs.

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