Strain gauge insulated against moisture penetration and method of manufacturing same
AssigneesMettler Toledo (Changzhou) Precision Instrument Ltd., Mettler-Toledo (Changzhou) Measurement Technology Ltd., Mettler-Toledo International Trading (Shanghai) Co., Ltd., Mettler-Toledo AG
InventorsXiangQun Zhu, ZhiGuo Shi, Lei Xu, Jean-Christophe Emery
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Abstract
A strain gauge (12, 21A, 21B, 25A, 25B, 31, 35, 41, 45) and method of manufacturing a strain gauge (12, 21A, 21B, 25A, 25B, 31, 41, 35, 45) against moisture penetration comprises or includes the step of producing a coated base or cover layer (14, 31 34, 44) by forming a moisture barrier coating (17) on the surface the latter.
Claims25
A strain gauge insulated against moisture penetration, the strain gauge comprising:
- a base layer of a polymer substrate foil material;
- a resistor track layer on a metallic resistive foil material, the resistor track being in the shape of a meandering structure and having electrode pads for contacting the resistor track, the resistor track layer being laminated together with the base layer;
- and
- a strain gauge produced by means of a chemical etching method on the laminated base and resistor track layers;
- wherein at least one of the following obtains:
- a moisture barrier coating is formed, by means of a deposition process, on all sides of the base layer so that the moisture barrier coating encapsulates the base layer;
- or
- the strain gauge further comprises a cover layer of a polymer film foil material and with a moisture barrier coating is formed, by means of a deposition process, on at least one side of the cover layer, providing a coated cover layer that is overlaid on the surface of the resistor track layer to cover at least part of the strain gauge.
A method of manufacturing a strain gauge that is insulated against moisture penetration, the method comprising the steps of:
- providing a polymer substrate foil material to serve as a base layer;
- laminating the base layer to a resistor track layer on a metallic resistive foil material, the resistor track having the shape of a meandering structure and electrode pads for making contact with the resistor track;
- chemically etching a strain gauge on the laminated layers;
- and
- insulating the strain gauge from moisture penetration by:
- before laminating the base layer to the resistor track layer, encapsulating the base layer in a moisture barrier coating formed on all surface sides of the base layer, using a deposition process;
- and
- providing a cover layer of a polymer film foil material;
- producing a coated cover layer by using a deposition process to form a moisture barrier coating on the cover layer;
- and
- applying the coated cover layer to the strain gauge to cover at least a part thereof.
A method of manufacturing a strain gauge that is insulated against moisture penetration, the method comprising the steps of:
- providing a polymer substrate foil material to serve as a base layer;
- laminating the base layer to a resistor track layer on a metallic resistive foil material, the resistor track having the shape of a meandering structure and ha;
- electrode pads for making contact with the resistor track;
- chemically etching a strain gauge on the laminated layers;
- and
- insulating the strain gauge from moisture penetration by:
- providing a cover layer of a polymer film foil material;
- producing a coated cover layer by using a deposition process to form a moisture barrier coating the cover layer;
- and
- applying the coated cover layer to the strain gauge to cover at least a part thereof.
Dependencies are inferred from the claim text.