An Ultraprecision On-Machine Measurement System

2005 ◽  
Vol 295-296 ◽  
pp. 375-380 ◽  
Author(s):  
Hitoshi Ohmori ◽  
Y. Watanabe ◽  
Wei Min Lin ◽  
Kazutoshi Katahira ◽  
T. Suzuki
Keyword(s):  
Measurement System ◽  
High Efficiency ◽  
Complex Form ◽  
Profile Measurement ◽  
Accuracy Control ◽  
Optical Components ◽  
Form Accuracy ◽  
Measurement Systems ◽  
Maximum Resolution ◽  
Measurement And Evaluation

Ultraprecision optical components require ultra-fine smooth surface quality of sub-nanometer or sub-angstrom in Ra. To satisfy these requirements, ultraprecision on-machine measurement system is very important, by which the profile measurement and evaluation is conducted on the machine. The form accuracy is improved by compensating machining when the form accuracy is not enough. Ultraprecision on-machine measurement systems were developed for measurement with high-accuracy and high-efficiency. It was confirmed that the on-machine measurement with AFM was possible for surface roughness or complex form for local areas. In addition, a laser probe unit with a maximum resolution of 1nm, a measuring range of 10mm, a repeatability of 5.6nm and a maximum measurable angle of 60 degrees was developed. The possibility of the non-contact on-machine form measurement was confirmed for global form accuracy control.

Waviness measurement system for implementing in laser destructuring by remelting of metal surfaces

2020 ◽  
pp. 8-13
Author(s):  
Oleg M. Oreshkin ◽  
Viacheslav A. Khloponin ◽  
Daniil V. Panov ◽  
Denis V. Ushakov
Keyword(s):  
Measurement System ◽  
Laser Processing ◽  
Radiation Power ◽  
Surface Profile ◽  
Vertical Direction ◽  
Profile Measurement ◽  
Surface Waviness ◽  
Lateral Direction ◽  
Measurement Systems ◽  
Processing Machine

To increase the efficiency of laser destructuring, data on the waviness of the part associated with the coordinate system of the laser processing machine are required. At present, there are no non-contact profile measurement systems on the market that meet all the requirements that apply to a system for measuring the surface profile of parts and are determined by the parameters of the laser destructuring. The developed measurement system will allow to take waviness measurement directly at the laser processing machine, which will significantly reduce the complexity of the process. A prototype of a system for measuring the surface profile (waviness) has been created inaccordance with the measurement requirements for a laser processing machine. The scheme and principle of operation of the system for measuring the waviness of the installation for laser destructuring are described. In measurements, the triangulation method was used. A prototype allows to measure the profile of the of the surface waviness with a spatial wavelength of 2 mm with an accuracy of 3,78 μm in the vertical direction and 13,8 μm in the lateral direction. The accuracy of the prototype was verified using the standard method of stylus profilometry. The waviness profile obtained with a developed system can be used to modulate the amplitude of the laser radiation power in the laser destructuring.

scholarly journals An Approach for Simple Linear Profile Gauge R&R Studies

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Liangxing Shi ◽  
Wei Chen ◽  
Liang Fu Lu
Keyword(s):  
Measurement Error ◽  
Measurement System ◽  
Profile Measurement ◽  
Measurement Systems ◽  
Linear Profile ◽  
Response Slope ◽  
Sources Of Variation ◽  
Repeatability And Reproducibility ◽  
Elasticity Measurement

Gauge repeatability and reproducibility studies are significant to quality improvement and quality control. The approaches are always applied to determine the capability of the measurement system. Much of the literature in this field mainly focuses on univariate and multivariate measurement systems. However, the state-of-the-art methods are not appropriate when the quality of a product is characterized by a profile. Therefore, this paper proposes a method for the measured values which can be characterized by a simple linear profile. In addition, the slopes and intercepts of these profiles often vary due to measurement error. Thus, the simple linear profile gauge studies can be considered as a two-response (slope and intercept) problem.X-values transformation is used to make the slope and intercept of each profile independent. ANOVA is utilized to estimate the variance component of measurement error and other sources of variation. Then, the criteria precision to tolerance ratio and percent R&R are introduced to assess the simple linear profile measurement system capability. Finally, the proposed approach is applied to the spring length and elasticity measurement which demonstrates how to implement the method.

scholarly journals Development of Thermal Performance Metrics for Direct Gas-Fired Circulating Heaters

Agriculture ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 588
Author(s):  
Benjamin C. Smith ◽  
Brett C. Ramirez ◽  
Steven J. Hoff
Keyword(s):  
Mass Flow ◽  
Measurement System ◽  
Thermal Efficiency ◽  
Performance Metrics ◽  
Standardized Test ◽  
Flow System ◽  
Standard Test ◽  
Testing System ◽  
Measurement Systems ◽  
Selection Of

Many climate-controlled agricultural buildings use direct gas-fired circulating heaters (DGFCH) for supplement heat. There is no standardized test to calculate thermal efficiency for these heaters. This study aimed to develop a measurement system and analytical analysis for thermal efficiency, quantify the measurement uncertainty, and assess economics of DGFCH efficiency. The measurement system developed was similar to the ASHRAE 103 standard test stand with adaptations to connect the apparatus to the DGFCH. Two different propane measurement systems were used: input ratings < 30 kW used a mass flow system and input ratings > 30 kW used a volumetric gas meter. Three DGFCHs (21.9, 29.3, 73.3 kW) were tested to evaluate the system. Thermal efficiencies ranged from 92.4% to 100.9%. The resulting uncertainty (coverage factor of 2; ~95% Confidence Interval) ranged from 13.1% to 30.7% for input ratings of 56.3 to 11.4 kW. Key sources of uncertainty were propane and mass flow of air measurement. The economic impact of 1% difference in thermal efficiency ranged from USD $61.3 to $72.0 per heating season. Refinement of the testing system and procedures are needed to reduce the uncertainty. The application of this system will aid building designers in selection of DGFCHs for various applications.

An Acoustic System for Pipeline Profile Measurement

1983 ◽  
Vol 105 (4) ◽  
pp. 475-479
Author(s):  
H. Van Calcar
Keyword(s):  
Measurement Technique ◽  
Measurement System ◽  
Performance Enhancement ◽  
Three Dimensional ◽  
Profile Measurement ◽  
Baseline Measurement ◽  
Acoustic System ◽  
Position Measurement ◽  
Long Baseline ◽  
Hardware Configuration

This paper presents an acoustic position measurement system used for precise three-dimensional flowline profile measurement. The system measures several points along the flowline using the long-baseline measurement technique and augments this measurement with depth telemetry repeaters to maintain elevation accuracy throughout the changing installation geometry. The paper discusses both the measurement system and the performance enhancement features. The paper concludes with a discussion of the hardware configuration and the accuracy that can be expected when the technique is extended into deeper operating areas.

Development of Visual Size-Measurement System for Micro-Optical Components

2021 ◽  
Vol 58 (8) ◽  
pp. 0815006
Author(s):  
赵美丹 Zhao Meidan ◽  
余桂英 Yu Guiying ◽  
瞿永顺 Qu Yongshun ◽  
林瑞杰 Lin Ruijie ◽  
林敏 Lin Min
Keyword(s):  
Measurement System ◽  
Size Measurement ◽  
Optical Components ◽  
Visual Size

scholarly journals Performance Evaluation and Measurement in Public Organizations: A Systematic Literature Review

2016 ◽  
Vol 8 (1) ◽  
pp. 106 ◽  
Author(s):  
Orlando Troisi ◽  
Carlo Torre ◽  
Gennaro Maione
Keyword(s):  
Literature Review ◽  
Systematic Literature Review ◽  
Public Organizations ◽  
Public Companies ◽  
Main Research ◽  
Evaluation Systems ◽  
Measurement Systems ◽  
Business Results ◽  
Performance Measurement Systems ◽  
Measurement And Evaluation

The turbulence of the current competitive environment emphasizes the importance of the role played by performance measurement systems in generating an improvement of business results. Starting from this consideration, the work pursues a twofold goal: firstly, it tries to verify the existence and the degree of a research interest about this topic; secondly, it seeks to identify, in measurement and evaluation systems, which factors are capable of producing an effect on performances of public organizations. In order to well respond to the research purposes, the work begins with a systematic literature review, which highlights a growing attention of scholars on all those variables considered critical in conducting and managing public organizations. The study, highlighting the existence of six variables to be advantageously taken into account in managing public organizations, especially in light of the potential influence that they seem to exert on different types of business performances, could be considered as a useful tool for both practitioners (managers of public organizations) and scholars (professors, researchers, students, etc.) aimed at helping to become aware about the advantages arising from an adequate management of performances measures. The main research limitation is the lack of an empirical analysis of public companies performance plans, which should be thoroughly examined to allow a possible further generalization of the theoretical findings achieved.

scholarly journals Measurement and Compensation of Tool Contour Error Using White Light Interferometry for Ultra-Precision Diamond Turning of Freeform Surfaces

2020 ◽  
Vol 14 (4) ◽  
pp. 654-664 ◽  
Author(s):  
Kodai Nagayama ◽  
◽  
Jiwang Yan
Keyword(s):  
White Light ◽  
High Efficiency ◽  
Diamond Tool ◽  
Microlens Array ◽  
Diamond Turning ◽  
Contour Error ◽  
Form Accuracy ◽  
Freeform Optics ◽  
Ultra Precision ◽  
Quick Measurement

In ultra-precision diamond turning of freeform optics, it is necessary to obtain submicron-level form accuracy with high efficiency. In this study, we proposed a new method for the quick measurement and compensation of tool contour errors to improve the form accuracy of the workpiece. In this method, the nanometer-scale contour error of a diamond tool is quickly and precisely measured using a white light interferometer and then compensated for, before machining. Results showed that the contour of a diamond tool was measured with an error less than 0.05 μm peak-to-valley (P-V) and the feasibility of error compensation was verified through cutting experiments to create a paraboloid mirror and a microlens array. The form error decreased to 0.2 μm P-V regardless of the contour error of the diamond tools when cutting the paraboloid mirror, and that of the microlens array was reduced to 0.15 μm P-V during a single machining step.

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