High-Accuracy Calibration of CMM Using Temporal-Coherence Fiber Interferometer with Fast-Repetition Comb Laser

2014 ◽  
Vol 625 ◽  
pp. 66-72
Author(s):  
Narin Chanthawong ◽  
Satoru Takahashi ◽  
Kiyoshi Takamasu ◽  
Hirokazu Matsumoto
Keyword(s):  
Interference Fringe ◽  
Laser Interferometer ◽  
Fiber Type ◽  
Michelson Interferometer ◽  
Temporal Coherence ◽  
Measuring System ◽  
Continuous Laser ◽  
Reference Length ◽  
Measuring Machine ◽  
5 Ghz

A coordinate measuring machine (CMM) is a measuring system with the means to move probing system and capability to determine spatial coordinates on working surface. CMM is used in many industry fields from few micrometers of work pieces to a 5-meter truck. The verification method of CMM is done following international standard. The artifacts for calibrated reference length are the end standards, such as gauge block and step gauge, or laser interferometer for large size CMM. The current laser interferometer is operated by continuous laser and interference fringe counting. One constraint of continuous laser is an incremental measurement. The measurement path cannot be interrupted during the measurement period. We developed a new absolute interferometer system from a short-pulse mode-locked fiber laser. A Fabry–Pérot etalon (FPE) is used to select high-frequency parts of repetition-frequency modes of the mode-locked comb laser at the wavelength of 1.55 μm. The 5-GHz repetition-modified laser beam, which is realized by a new fiber-type FPE, is transmitted to a fiber-type Michelson interferometer. The interference fringes exhibit a temporal coherence interference and can be used for measuring spatial positioning. The temporal coherence between different pairs of modified pulse trains is referred to as absolute length standards. The performance of CMM was determined directly from different positions of two interference fringe patterns.

scholarly journals Redesigned Sensor Holder for an Atomic Force Microscope with an Adjustable Probe Direction

2021 ◽  
Author(s):  
Janik Schaude ◽  
Maxim Fimushkin ◽  
Tino Hausotte
Keyword(s):  
Atomic Force Microscope ◽  
Piezoelectric Actuator ◽  
High Speed ◽  
Closed Loop ◽  
Coefficient Of Thermal Expansion ◽  
Measuring System ◽  
Contact Mode ◽  
Loop Control ◽  
Atomic Force ◽  
Measuring Machine

AbstractThe article presents a redesigned sensor holder for an atomic force microscope (AFM) with an adjustable probe direction, which is integrated into a nano measuring machine (NMM-1). The AFM, consisting of a commercial piezoresistive cantilever operated in closed-loop intermitted contact-mode, is based on two rotational axes, which enable the adjustment of the probe direction to cover a complete hemisphere. The axes greatly enlarge the metrology frame of the measuring system by materials with a comparatively high coefficient of thermal expansion. The AFM is therefore operated within a thermostating housing with a long-term temperature stability of 17 mK. The sensor holder, connecting the rotational axes and the cantilever, inserted one adhesive bond, a soldered connection and a geometrically undefined clamping into the metrology circle, which might also be a source of measurement error. It has therefore been redesigned to a clamped senor holder, which is presented, evaluated and compared to the previous glued sensor holder within this paper. As will be shown, there are no significant differences between the two sensor holders. This leads to the conclusion, that the three aforementioned connections do not deteriorate the measurement precision, significantly. As only a minor portion of the positioning range of the piezoelectric actuator is needed to stimulate the cantilever near its resonance frequency, a high-speed closed-loop control that keeps the cantilever within its operating range using this piezoelectric actuator further on as actuator was implemented and is presented within this article.

Study of Large Scale Measurement Method Based on Leapfrog Principle

2011 ◽  
Vol 130-134 ◽  
pp. 1560-1563
Author(s):  
Long Jiang Zheng ◽  
Xue Li ◽  
Ling Ling Qin ◽  
Hong Bin Chen ◽  
Xue Gao ◽  
...  
Keyword(s):  
Coordinate Transformation ◽  
Large Scale ◽  
Manufacturing Industry ◽  
Coordinate Measuring Machine ◽  
Measuring Method ◽  
Measuring System ◽  
Wide Range ◽  
General Coordinate Transformation ◽  
Measuring Machine ◽  
The Mathematical Model

At present，large scale and space coordinates measuring system with wide-range and high-precision has been widely used in modern manufacturing industry. In this paper, large scale measuring method based on leapfrog principle of flexible three coordinate measuring machine is described. The mathematical model of coordinate transformation is built and the general coordinate transformation formula after number of times leapfrogging is derived. The best positioning and each step of leapfrog are given.

Calibrator for 2D Grid Plate Using Imaging Coordinate Measuring Machine with Laser Interferometers

2015 ◽  
Vol 9 (5) ◽  
pp. 541-545 ◽  
Author(s):  
Mariko Kajima ◽  
◽  
Tsukasa Watanabe ◽  
Makoto Abe ◽  
Toshiyuki Takatsuji
Keyword(s):  
Measurement Method ◽  
Laser Interferometer ◽  
Coordinate Measuring Machine ◽  
Calibration Procedure ◽  
Expanded Uncertainty ◽  
Geometrical Error ◽  
Grid Plate ◽  
Measuring Machine ◽  
Laser Interferometers

A calibrator for 2D grid plates have been developed. The calibrator was based on a commercial imaging coordinate measuring machine (imaging CMM). A laser interferometer for the calibration of the x-coordinate and two laser interferometers for the calibration of the y-coordinate were attached to the imaging CMM. By applying multistep measurement method for the calibration procedure, the geometrical error in the calibrator was reduced. The calibration of a precision 2D grid plate was demonstrated, and the expanded uncertainty was estimated to be 0.2 μm (k =2).

scholarly journals On the Industrialization of Screw Lead Measuring Machine with Laser Interferometer

1975 ◽  
Vol 41 (488) ◽  
pp. 919-924 ◽  
Author(s):  
Akira YAMAMOTO ◽  
Isamu YOSHIMOTO ◽  
Kazuo MARUYAMA ◽  
Yoshihisa TANIMURA ◽  
Kazuhide OHTA
Keyword(s):  
Laser Interferometer ◽  
Measuring Machine

scholarly journals The accuracy of calculating form deviations of selected free-form surfaces

Mechanik ◽  
2017 ◽  
Vol 90 (11) ◽  
pp. 1035-1037
Author(s):  
Marek Magdziak ◽  
Andrzej Kawalec
Keyword(s):  
Coordinate Measuring Machine ◽  
Measuring System ◽  
Free Form ◽  
Experimental Investigations ◽  
Simulation Studies ◽  
Numerical Investigations ◽  
Measuring Machine ◽  
Coordinate Measurements ◽  
Simulation Results ◽  
Free Form Surfaces

The possible reason for the incorrect form deviations calculated using an algorithm available in the selected software of coordinate measuring machine was identified. This method is available in the Calypso software and it is based on local deviations calculated at nominal points. The analysis was made for the selected examples of free-form surfaces. There are presented the results of numerical investigations based on simulations of coordinate measurements of selected object. The measured points were generated with assumed values of scatter in relation to the nominal profiles of the analyzed product. The simulations were made using 3 selected methods for computing the form deviations and various distances between the measured points. In order to verify the results of simulation studies there were made experimental investigations. The experimental investigations were done using selected coordinate measuring system and chosen measurement parameters. The results of performed measurements confirm the simulation results.

719 Development of gear measuring machine which has coordinate measuring system and three dimensional analysis on gear flank surface

2014 ◽  
Vol 2014.67 (0) ◽  
pp. _719-1_-_719-2_
Author(s):  
Kensuke UESUGI ◽  
Shuhei KUROKAWA ◽  
Takashi TERAOKA ◽  
Md. Hazrat ALI ◽  
Yoji MATSUKAWA ◽  
...  
Keyword(s):  
Dimensional Analysis ◽  
Three Dimensional ◽  
Measuring System ◽  
Measuring Machine ◽  
Flank Surface

Laser interferometer calibration system for extensometers

1968 ◽  
Vol 58 (5) ◽  
pp. 1379-1383
Author(s):  
G. Hade ◽  
M. Conner ◽  
J. T. Kuo
Keyword(s):  
Laser Interferometer ◽  
Michelson Interferometer ◽  
Low Frequency ◽  
Calibration Method ◽  
Linear Range ◽  
Laser Source ◽  
Calibration System ◽  
Frequency Oscillator ◽  
Transducer Output ◽  
Optical Calibration

Abstract A laser interferometer technique has been developed for calibrating extensometers at the Ogdensberg Station of Lamont Geological Observatory. It provides remotecontrolled calibration of both horizontal and vertical extensometers within the linear range of the transducer output. The present calibration system consists of an electromagnetic driving unit and a Michelson interferometer. The transducer end of the extensometer is displaced longitudinally with an electromagnetic driving unit, which is excited by a variable low-frequency oscillator with a bandwidth of 0.0005 to 60 kHz. The resultant displacement is detected by counting fringe displacements of the interferometer with an Ne-He laser source. With this calibration system, motion as small as 0.03 micron can be determined with excellent repeatability and with errors of less than 5 per cent, in comparison with errors of more than 40 per cent for the optical calibration method previously used.

NON-CON NON-CONTACT POINT MEASURING EQUIPMEN T MEASURING EQUIPMENT FOR ROBO T FOR ROBOTIC SYSTEMS OF AUTOMOBILE INDUSTRY

2020 ◽  
Vol 2020 (4) ◽  
pp. 232-238
Author(s):  
J Khollhujayev ◽  
◽  
N Abdukarimov ◽  
J Mavlonov ◽  
N Abdivahidova
Keyword(s):  
Contact Point ◽  
Measuring System ◽  
Vehicle Body ◽  
Inspection Time ◽  
Robotic Arm ◽  
Small Scale ◽  
Prototype Model ◽  
Laser Sensor ◽  
Body Frame ◽  
Measuring Machine

The non-contact measurement method development is caused by the need for precise measurement and elimination of an operator’s errors. The purpose of the atticle research is to develop a reliable small scale prototype model of non-contact point measuring system. The mathematical model of robotic articulated arm has been developed to analyze the forward kinematics. Then, the prototype model of a robotic arm and laser-sensor mounted technique have been developed to take the measurements. The idea was derived from the coordinate measuring machine working principle, that puts the tip or tool center point in the known position with necessary precision. Most of the production engineers rely on the measurement data obtained from the CMMs. Most of the CMMs used in Uzbekistan are mainly contact based CMMs that have a number of disadvantages, i.e. a liitle inspection time. Also, the ergonomics and redundancy of the CMMs body frame are not acceptable. The surfaces of a vehicle body frame are designed in the free forms to give better aerodynamics and smaller resistance coefficients that result in difficult shapes that is not possible to reach easily with the ordinary CMM. The scientifically-developed robotic arm based on the non-contact CMM helps to cope with this issues

Étude expérimentale de propriétés piézo-optiques du CCl4 liquide

1984 ◽  
Vol 62 (6) ◽  
pp. 548-553 ◽  
Author(s):  
J. M. St-Arnaud ◽  
T. K. Bose
Keyword(s):  
Refractive Index ◽  
High Pressures ◽  
Michelson Interferometer ◽  
Etude Expérimentale ◽  
Measuring System ◽  
Lorenz Equation ◽  
Optical Effects ◽  
Étude Expérimentale

We have developed a measuring system based on the Michelson interferometer for the determination of piezo-optical effects in liquids. The resolution of our system is about 5 parts in 107. We applied our system to the measurement of the variation of the refractive index of CCl4 at 25 °C up to 1.96 × 103 bar. We observe a slight deviation of the Lorentz–Lorenz equation at high pressures.

scholarly journals Development of a new hybrid yarn construction from recycled carbon fibres for high-performance composites: Part IV: Measurement of recycled carbon fibre length

2020 ◽  
Vol 15 ◽  
pp. 155892502091072
Author(s):  
Martin Hengstermann ◽  
Karl Kopelmann ◽  
Andreas Nocke ◽  
Anwar Abdkader ◽  
Chokri Cherif
Keyword(s):  
Carbon Fibre ◽  
High Performance ◽  
Fibre Length ◽  
Reference Method ◽  
Single Fibre ◽  
Measuring System ◽  
Carbon Fibres ◽  
Reinforced Plastics ◽  
Hybrid Yarn ◽  
Reference Length

Due to the increasing application of carbon fibre–reinforced plastics, the use of recycled carbon fibres can help reduce the tremendous amount of carbon fibre waste growing worldwide. In this context, the processing of longer recycled carbon fibres (>40 mm mean length) into hybrid yarn constructions offers a promising solution. The characterisation of recycled carbon fibre length is essential for textile processes. However, to suit the atypical fibre characteristics of recycled carbon fibres compared to standard natural or man-made-fibres, the development of an adequate measuring technique is required. Investigations on the state of the art suggest that an adapted fibrograph method might pose an appropriate measuring system. Therefore, new test equipment and an alternative image analysing method based on pixel greyscale values were developed. To enable a calibration process, different samples with cut carbon fibre from carded and drafted slivers were intensively tested and compared. In addition, an adapted reference method was investigated by combining single fibre measurement and image processing techniques. In a final step, recycled carbon fibres samples with unknown fibre length were tested. Results proved that the presented measuring system is adequate for the testing of longer recycled carbon fibres in webs or slivers. All measured values were close to the measured reference length values (deviation ±4%).

Sign in / Sign up

Export Citation Format

Share Document