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Fbg strain sensor for curved surfaces

A sensor and bottom surface technology, applied in the field of FBG tensile sensors, can solve the problems of measurement error, tensile error transmission, etc., and achieve the effect of small measurement errors

Inactive Publication Date: 2014-12-03
HOTTINGER BRUEL & KJAER GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, due to the movement of the fibers, the actual stretch of the material surface is erroneously transmitted to the FBG, so that a measurement error depending on the radius of curvature of the material surface occurs
[0008] It thus turns out that neither the sensor according to JP2003279760A nor the sensor according to WO2008 / 101657A1 can be used for accurate tensile measurements on curved surfaces

Method used

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  • Fbg strain sensor for curved surfaces
  • Fbg strain sensor for curved surfaces
  • Fbg strain sensor for curved surfaces

Examples

Experimental program
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Embodiment Construction

[0030] Figure 1a A perspective view of a conventional metal membrane - DMS1 is shown on a curved material surface 2, such as a pipe or a pressure tank. The metal foil DMS 1 consists essentially of a plastic carrier foil 1a to which at least one meander-shaped thin metal foil strip 1b is fastened over its entire surface. To detect stretching, a plastic carrier film 1 a is glued onto the material surface 2 .

[0031] Figure 1b show Figure 1a side view, and Figure 1c show Figure 1b enlarged section view of . If the material is as in Figure 1cUtilize the stretching as shown by the stretching arrow A1, the stretching is evenly transmitted to the carrier film 1a due to the comprehensive sticking, and through the comprehensive connection of the metal film 1b and the carrier film 1a, the metal film 1b pulls stretch. In this way, the material stretching of the material surface 2 is transferred almost error-free to the metal foil strip 1b, which is indicated by the stretch...

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Abstract

An FBG strain sensor for measuring strains to curved surfaces, includes a fibre which is fixed between two securing elements whose undersides are designed as adhesive surfaces, the optical fibre and these securing elements being embedded in a protective compound which consists of a soft silicone rubber or a plastic that has comparable mechanical properties, and the fibre being embedded between an upper and a lower thin sliding film or a sliding tube that consists of Teflon or of a plastic which has a low friction coefficient comparable to Teflon, the underside of the lower sliding film or the lower external surface-line of the sliding tube lying in a plane with the adhesive surfaces of the securing elements.

Description

technical field [0001] The invention relates to a tension sensor with an optical fiber having a Fiber Bragg Grating, which is referred to below as an FBG tension sensor. The invention is also suitable for accurately measuring stretching on curved surfaces. Background technique [0002] Stretch-sensitive sensors that are fastened to the surface of the material to be examined are known as so-called metal film DMS or as FBG fiber sensors. The metal foil DMS essentially consists of a plastic carrier foil to which at least one meander-shaped thin metal foil strip is fastened over its entire surface, ie over its entire surface. A plastic carrier film is glued to the surface of the material to be inspected for the tensile test. It is necessary to use a plastic film as the sensor carrier, since only with this arrangement can the DMS be applied in a defined manner. Outside of laboratory conditions, very thin metal films cannot be applied electrically insulatingly without comparati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01L1/24G02B6/02
CPCG01B11/18G01L1/246
Inventor J·毛尔T·基普B·京特尔
Owner HOTTINGER BRUEL & KJAER GMBH