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Optical measuring device with temperature compensation

A technology for optical measurement and thermal expansion coefficient, which can be applied to measurement devices, use optical devices to transmit sensing components, and error compensation/elimination, etc., and can solve problems such as measurement errors.

Inactive Publication Date: 2006-05-31
FAGOR SCOOP LTDA
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] A possible problem with these types of optical measuring devices is that when the temperature changes, measurement errors can occur

Method used

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  • Optical measuring device with temperature compensation
  • Optical measuring device with temperature compensation
  • Optical measuring device with temperature compensation

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Embodiment Construction

[0026] refer to Figures 1 to 5 , the optical measuring device 1 of the present invention is of the following type, which includes: a glass graduated scale 2 with an incremental code track and an absolute code track; and a detection unit. The detection unit comprises: a device for measuring relative position, which includes a first photoelectric transmitter 6, a reading reticle 7 and a photodetector device 8; and a device for measuring an absolute position, which includes a second photoelectric transmitter CCD type linear sensor with device 9 and photodetector 11.

[0027] refer to figure 1 , the device 1 measures linear displacement and, in the embodiment shown, the graduated scale 2 is mounted on a protective mold 3 which itself is mounted on a first fixed object (not shown in the figure), such as a base. The detection unit comprises a positioning module 10 containing means for measuring relative and absolute positions. The positioning module 10 is mounted on a mounting b...

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Abstract

"Optical measuring device that comprises a graduated scale (2) with an incremental track and an absolute track, and a detection unit that comprises means for measuring a relative position which comprise a first photoemitter (6), a sensing graticule (7) and photodetector means (8), and means for measuring an absolute position that comprise a second photoemitter (9) and a linear sensor of photodetectors (11). The detection unit comprises a positioning module (10) that has, attached to it by adhesive means (20), a support piece (30) in which the sensing graticule (7) and the linear sensor of photodetectors (11) are arranged. The physical characteristics of the support piece (30), the adhesive means (20) and the positioning module (10) are such that the equivalent thermal expansion coefficient (± 30e ) of the support piece (30) is substantially the same as the thermal expansion coefficient (± 2 ) of the graduated scale (2)."

Description

technical field [0001] The present invention relates to an optical measuring device for linear and angular displacements, more particularly, to an optical measuring device comprising: a graduated scale having at least two tracks, an incremental track and an absolute track; and a detection unit having means for measuring relative position and means for measuring absolute position. Background technique [0002] Optical measuring devices are known which comprise: a graduated scale with incremental and absolute code tracks; and a detection unit with means for measuring relative position and means for measuring absolute position. [0003] US 5,235,181 A discloses an optical measuring device having these features. In order to measure the relative position, the detection unit comprises a first photoelectric transmitter, a sensing graticule and a photodetector device, and in order to measure an absolute position, the detection unit further comprises a second phototransmitter and a ...

Claims

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Application Information

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IPC IPC(8): G01D5/32G01D5/26
CPCG01B5/0014G01D5/34707
Inventor 伊格纳西奥·亚历杭德雷何塞·哈维尔·孙苏内吉胡安·卡洛斯·乌拉
Owner FAGOR SCOOP LTDA
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