Optical sensor, in particular for a cylinder, and application
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United States of America Patent
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Oct 9, 2018
Grant Date -
Mar 16, 2017
app pub date -
Sep 16, 2016
filing date -
Sep 16, 2015
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Abstract
A sensor (S) is provided for determining the stroke of the piston rod (6) of a fluid cylinder, particularly a hydraulic or pneumatic cylinder. The sensor includes a lighting unit for illuminating a code applied on the surface of the piston rod and differing from said surface by color, a first camera unit with a first lens system for recording a first image of the illuminated code in a first scanning window, an evaluation unit for evaluating output signals of the first camera unit, and an interface for issuing the evaluated output signals as information regarding the position of the piston rod. Additionally, a second redundant camera unit is provided with a second lens system, which serves for recording a second image of the illuminated code in a second scanning window. According to the invention the second camera unit is arranged such that the second scanning window is spaced apart in the direction of the extension of the piston rod by a predetermined value from the first scanning window of the first camera unit. The output signals of the second camera unit are evaluated in an evaluation unit as information about the respective position by forming a difference, with in case of said difference being consistent with a predetermined value the output signal being considered information about the stroke of the piston rod, and in case of inconsistency of the difference with the predetermined value an error message being issued.
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- 15 United States
- 10 France
- 8 Japan
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- 2 Other
Patent Owner(s)
- WEBER-HYDRAULIK GMBH
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Jahn, Volker | Heidesee, DE | 2 | 2 |
Schinkel, Marcus | Bestensee, DE | 3 | 2 |
Schwab, Christian | Sternenfels, DE | 4 | 4 |
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