An Approach Method to Calibrate the Autocollimator with Small Angle Measurement Range

Novyanto, Okasatria; Alfiyati, Nurul

doi:10.1007/s12647-015-0153-1

Cited by 7 publications

(8 citation statements)

References 3 publications

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“…Untuk memastikan kebenaran penunjukkan penguku ran, level elektronik dapat dikalibrasi dengan mengunakan standar sudut yang mempunyai sifat inklinasi, seperti rotary table, sine bar dan meja inklinasi. [10] Meja inklinasi terbuat dari besi cor (cast iron) dengan panjang tertentu, pada umumnya 500 mm. Pangkalnya merupakan titik tumpu yang dapat digerakkan naik turun menggunakan mekanisme ulir.…”

Section: A Pendahuluanunclassified

“…Posisi Penunjukan Level Elektronik [10] dengan: Birge ratio ini membandingkan nilai penyebaran data hasil pengukuran dengan sebaran data yang diharapkan dari semua la poran ketidakpastian peserta. Birge ratio memiliki nilai ekspektasi sebesar E(R B 2 ) = 1, ketika hasil pengukuran dan ketidakpastian baku semua peserta tidak memiliki perbedaan yang signifikan.…”

Section: Perhitungan En Number Dan Birge Ratio Testunclassified

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Sistem Pengukuran Untuk Menentukan Penyimpangan Sudut Level Elektronik Dengan Menggunakan Metode Inklinasi

2016

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ABSTRAKTelah dibuat suatu sistem pengukuran untuk menentukan penyimpangan sudut pada level elektronik dengan menggunakan metode inklinasi. Metode ini menggunakan prinsip trigonometri dengan nilai sumbu x dan y yang diperoleh dari panjang meja inklinasi dan pergerakan length gauge. Level elektronik diletakkan di atas meja inklinasi yang searah sumbu x, kemudian diberikan kemiringan tertentu sehingga terjadi perubahan jarak pada sumbu y. Besarnya perubahan jarak tersebut diukur oleh length gauge. Perpaduan nilai kedua sumbu ini digunakan untuk mendapatkan besarnya nilai sudut terukur. Hasil tersebut diperbandingkan dengan hasil pengukuran menggunakan standar sudut swakalibrasi (SelfA47) yang sudah tervalidasi sebagai nilai acuan. Hasil perhitungan menunjukkan bahwa seluruh titik sampel pengukuran memenuhi kriteria dengan nilai E n terbesar berada pada titik -1.400 µm/m, yakni 0,62, sedangkan nilai En terkecil berada pada titik 700 µm/m, yakni 0,02. Dengan demikian, secara eksperimental, metode ini dapat diaplikasikan untuk menentukan penyimpangan sudut level elektronik yang memiliki rentang pengukuran hingga ±2.000 µm/m. Meskipun demikian, hanya 70% saja dari rentang ukur keseluruhan yang disarankan sebagai rentang ukur efektif.

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Section: A Pendahuluanunclassified

Section: Perhitungan En Number Dan Birge Ratio Testunclassified

Sistem Pengukuran Untuk Menentukan Penyimpangan Sudut Level Elektronik Dengan Menggunakan Metode Inklinasi

2016

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“…The autocollimator is an important angle measuring instrument [1][2][3][4][5][6] that enables noncontact measurement with high accuracy and high resolution. However, the performance of this instrument is limited in large-scale and long-distance applications because of the autocollimator's physical characteristics and operating principle, and this limitation prevents use in many prominent areas, such as ship and aircraft manufacturing and generator and radar monitoring.…”

Section: Introductionmentioning

confidence: 99%

Error compensation for long-distance measurements with a photoelectric autocollimator

Konyakhin

Zhang

et al. 2019

Opt. Eng.

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Although autocollimators enable noncontact measurement, their performance is limited in large-scale and long-distance applications because of errors caused by nonideal point light sources. Therefore, we analyze this type of measurement error, including the error source and the equations used to describe the irradiance distribution of the light spot. A two-dimensional exponential approximation formula is used to express the light irradiance distribution and compensate the spot imaging errors. Experimental results show that the measurement error could be reduced by sixfold. Therefore, the proposed compensation algorithm can be applied to autocollimator measurements over distances.

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“…Realization of small angles is usually done using circle dividers [6,9] or small angle generators [8,10,11]. Both can achieve high precision, but a small angle generator is generally the less expensive method for generating small angles with high precision.…”

Section: Introductionmentioning

confidence: 99%

“…Circle dividers suitable for small angle measurement are typically based on rotary tables and use different optical, electronic or mechanical encoders to provide precise division of the full circle into smaller angles [6,9,12]. The setups are usually built in such way that gravity does not create bending moments that would cause uncertainty.…”

Section: Introductionmentioning

confidence: 99%

Interferometric 2D small angle generator for autocollimator calibration

et al. 2017

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Small angle generators are simple devices for providing small angles traceable to the definition of the SI-unit radian. The most accurate ones use a laser interferometer for measurement of angular displacement. Small angle generators used for autocollimator calibration usually create angles around a single axis. A two-directional angle generator would be preferable, as it could more efficiently reveal artefacts related to angular displacement across both axes, such as orthogonality of the autocollimator's measuring axes. Characterizing errors depending on one axis only would also be easier, as the setup needs to be aligned only once for studying both axes of the autocollimator. We describe a novel interferometric two-directional small angle generator which we have built and tested for autocollimator calibration. The range is ±1000″ for both axes. The estimated standard uncertainty for full range is 0.0036″ for the horizontal and 0.0053″ for the vertical direction.

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An Approach Method to Calibrate the Autocollimator with Small Angle Measurement Range

Cited by 7 publications

References 3 publications

Sistem Pengukuran Untuk Menentukan Penyimpangan Sudut Level Elektronik Dengan Menggunakan Metode Inklinasi

Sistem Pengukuran Untuk Menentukan Penyimpangan Sudut Level Elektronik Dengan Menggunakan Metode Inklinasi

Error compensation for long-distance measurements with a photoelectric autocollimator

Interferometric 2D small angle generator for autocollimator calibration

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