Traceability enhancement in angle measurements

Giniotis, Vytautas; Rybokas, Mindaugas

doi:10.1016/j.measurement.2009.07.015

Cited by 8 publications

(6 citation statements)

References 4 publications

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“…During this operation, movements of the centre are measured by two pick-ups of small linear displacement. Errors in radial direction are evaluated according to the value of displacement of the centre of the roundness measure in two perpendiculars to each other and to the axis of rotation directions or by assessing of the Lissajouis figures developed by vectorial sum of the displacements mentioned above [5]. During the calibration of precision spindles a glass or of other material made spherical (usually, semispherical) or cylindrical body (artefact) is used.…”

Section: Subjectivity Of Assessment Of Radial Rotation Errorsmentioning

confidence: 99%

Development of the Method of Accuracy Measuring of Precision Spindle

Kasparaitis

Giniotis

2012

mech

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Section: Subjectivity Of Assessment Of Radial Rotation Errorsmentioning

confidence: 99%

Development of the Method of Accuracy Measuring of Precision Spindle

Kasparaitis

Giniotis

2012

mech

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“…The research performed shows good possibilities to create the flat angle standard of π rad and to reproduce it at any high level metrological laboratory [6,7]. The main setup for this angle standard establishment is shown in Fig.…”

Section: Development Of the π π π π Rad Angle Standardmentioning

confidence: 99%

“…These are uncorrelated inputs. According to [7,8], the combined variance will be: of the standard angle of π rad determination equal to 0.06″…0.08″ (sec of arc; k=2). There are assumptions to reach a better result of the standard angle determination by improving sensitivity and repeatability of the reading instruments.…”

Section: Uncertainty Of Measurementmentioning

confidence: 99%

Creation of the π angle standard for the flat angle measurements

Giniotis¹,

Rybokas

2010

J. Phys.: Conf. Ser.

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Angle measurements are based mainly on multiangle prisms-polygons with autocollimators, rotary encoders fo high accuracy and circular scales as the standards of the flat angle. Traceability of angle measurements is based on the standard of the plane angle-prism (polygon) calibrated at an appropriate accuracy. Some metrological institutions have established their special test benches (comparators) equipped with circular scales or rotary encoders of high accuracy and polygons with autocollimators for angle calibration purposes. Nevertheless, the standard (etalon) of plane angle-polygon has many restrictions for the transfer of angle unit-radian (rad) and other units of angle. It depends on the number of angles formed by the flat sides of the polygon that is restricted by technological and metrological difficulties related to the production and accuracy determination of the polygon. A possibility to create the standard of the angle equal to π π π π rad or half the circle or the full angle is proposed. It can be created by the circular scale with the rotation axis of very high accuracy and two precision reading instruments, usually, photoelectric microscopes (PM), placed on the opposite sides of the circular scale using the special alignment steps. A great variety of angle units and values can be measured and its traceability ensured by applying the third PM on the scale. Calibration of the circular scale itself and other scale or rotary encoder as well is possible using the proposed method with an implementation of π π π π rad as the primary standard angle. The method proposed enables to assure a traceability of angle measurements at every laboratory having appropriate environment and reading instruments of appropriate accuracy together with a rotary table with the rotation axis of high accuracy-rotation trajectory (runout) being in the range of 0.05 µm. Short information about the multipurpose angle measurement test bench developed is presented.

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“…Mechatronic elements and devices are used to determine measuring errors and therefore to control the positioning of measured elements. Such measured objects used in angle calibration are precision rotary encoders, circular scales and multi -angular prism (polygon) [1,2]. For the last few years various attempts have been undertaken to automate the process of angle calibration.…”

Section: Introductionmentioning

confidence: 99%

Mechatronic Elements for Measuring Systems

Giniotis

Rybokas

Dmitrijev

et al. 2013

SSP

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This presentation deals with a new application of mechatronic means for angle measuring system; it can be applied in precision instrumentation and measurement equipment. Precise angle measuring is based on usage of angle measurement standards such as polygons, precision indexing tables and circular scales. Ring lasers and precision rotary encoders can also be used for this purpose as well as test benches created for angle calibration. Many angular and linear measurement transducers or encoders are used in industry and machine engineering for the position and displacement measurement. The accuracy of angular position fixed by means of these devices reach approximately 0.3" 0.1" (arc second). Control of their accuracy parameters is complicated task consisting from some high requirements needed for rotation, positioning, signal processing, object adjustment and data processing.

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Traceability enhancement in angle measurements

Cited by 8 publications

References 4 publications

Development of the Method of Accuracy Measuring of Precision Spindle

Development of the Method of Accuracy Measuring of Precision Spindle

Creation of the π angle standard for the flat angle measurements

Mechatronic Elements for Measuring Systems

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