Showa / Strain Gauge

A strain gauge consists of a thin metal foil, just a few microns thick, bonded onto an electrically insulating base (such as polyimide or polyester). The gauge pattern is formed using a photo-etching process, and the grid resistance is adjusted to a standard value. The temperature coefficient of resistance of the metal foil is also controlled to match the coefficient of thermal expansion of the material being measured, resulting in a self-temperature-compensated structure. This allows for accurate stress and strain measurements with minimal temperature effects, even on materials such as steel, stainless steel, and aluminum alloys.

Description

Overview

In modern society, strain gauges are essential measurement tools used to verify the functionality and safety of machines and structures. Adhesive-type strain gauges were first developed in the United States in 1938, and in Japan, foil-type strain gauges have been manufactured since 1962. They are important instruments for measuring the strength and properties of various materials, including metals, rubber, plastics, and ceramics.