An Absolute Optical Encoder using Modulated-Photo-Diode Arrays

In this paper, a compact absolute optical linear encoder is proposed. The index scale of the proposed encoder has the two track (80 μm and 2 mm pitches), which consist of the pitch-modulated grating and slit-width-modulated grating, respectively. Using the modulated gratings, the harmonic noises of...

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Bibliographic Details
Published inNihon Kikai Gakkai rombunshuu. C hen Vol. 67; no. 654; pp. 364 - 369
Main Authors HANE, Kazuhiro, NASHIKI, Masayuki, MATSUI, Keiji, YOKOYAMA, Masafumi, IEKI, Atsushi, SASAKI, Minoru
Format Journal Article
LanguageEnglish
Japanese
Published The Japan Society of Mechanical Engineers 2001
Subjects
Absolute Detection
Modulated Grating
Optical Encoder
Optical Measurement
Photo-Diode Arrays
Positioning
Sensor
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ISSN0387-5024
1884-8354
1884-8354
DOI10.1299/kikaic.67.364

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Summary:In this paper, a compact absolute optical linear encoder is proposed. The index scale of the proposed encoder has the two track (80 μm and 2 mm pitches), which consist of the pitch-modulated grating and slit-width-modulated grating, respectively. Using the modulated gratings, the harmonic noises of the encoder signals are decreased. Moreover, the respective lines of the slit-width-modulated grating are divided and re-distributed in the index scale to suppress the sensing error due to the contamination on the scale. By fabricating the index scale with silicon photodiode arrays, the proposed advantages are confirmed experimentally.
ISSN:0387-5024
1884-8354
1884-8354
DOI:10.1299/kikaic.67.364