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A New Method of Mass Measurement for Checkweighers

Kengo Fukuda Koji Yoshida Tetsuya Kinugasa Morihito Kamon Yoichiro Kagawa Toshiro Ono
Metrology and Measurement Systems | 2010 | No 2 | DOI: 10.2478/v10178-01-0014-8
Keywords checkweigher weighing method signal processing high accuracy
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Abstract

A checkweigher is an automatic machine to measure the weight of in-motion products. It is usually located around the end of the production process and ensures the weight of a product within specified limits. Any products are taken out of line if their weights are out of the specified limits. It is usually equipped with an optical device. It is used to make a trigger to set the time duration to allow a product to move completely on the weigh belt for sampling the weight. In this paper, a new method of mass measurement for checkweighers is proposed which uses just signal processing without the optical device. The effectiveness of the method is shown through experiments. Also a possibility of faster estimation of weight is shown.
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Authors and Affiliations

Kengo Fukuda
Koji Yoshida
Tetsuya Kinugasa
Morihito Kamon
Yoichiro Kagawa
Toshiro Ono

Imaging polarimeter with high-accuracy measuring principles in crystal optics

Mykola Shopa Serhiy Kobyakov Yaroslav Shopa
Opto-Electronics Review | 2022 | 30 | 3 | e141948 | DOI: 10.24425/opelre.2022.141948
Keywords birefringence crystal optics high-accuracy universal polarimeter imaging polarimeter polarization
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Abstract

An imaging polarimeter based on the principles of high-accuracy polarimetry well known in crystal optics is proposed. The application of scientific digital cameras for performance light measurements leads to precise data on polarizers quality, i.e., maps of extinction ratio and transmission axis. Processing of numerous images, acquired at various settings in the polarizer-sample-analyser system, allows to determine the two-dimensional distribution of the phase retardation of birefringent plates. Several results of imaging polarimetry experiments on birefringent plates demonstrate the impact of multiple light reflections on the measured phase retardation values. Experimental data for LiNbO 3 and SiO 2 crystal plates have been presented, demonstrating the capabilities of the proposed type of imaging polarimeter in the crystal optics studies. This technique also allows the measurement of the eigen wave ellipticities, associated with the optical activity of crystals.
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Authors and Affiliations

Mykola Shopa
1
ORCID: ORCID
Serhiy Kobyakov
2
ORCID: ORCID
Yaroslav Shopa
2
ORCID: ORCID
  1. Institute of Physics and Applied Computer Science, Gdańsk University of Technology, 11/12 Gabriela Narutowicza St., 80-233 Gdańsk, Poland
  2. Faculty of Mathematics and Natural Sciences, Cardinal Stefan Wyszyński University in Warsaw, 5 Dewajtis St., 01-815 Warsaw, Poland

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