The resistance strain gauge is a kind of element used to measure the strain, which is made of a constantan wire or nickel-chromium wire with a diameter of 0.02-0.05mm wound into a grid (or corroded into a grid with a very thin metal foil) in two layers of insulating sheet (substrate), and is connected with a tinned copper wire and the strain gauge wire grid as a strain gauge lead, which is used to connect the measurement wire. There are three main types of strain gauges, namely wirewound, short-circuit and foil resistors.
First of all, let's talk about the wire-wound resistor sheet, it is a form of wrapping the resistance sheet with a resistance wire, using a paper bottom and a paper cover, compared with other strain gauges in the price is very favorable, widely used in the laboratory, the common semi-circular elbow flat winding, but the defect of this strain gauge is poor accuracy, the transverse effect coefficient is large, so it is not suitable for use in the field of high precision requirements.
The second is the short-circuit type, which is very simple to make, as long as it is between a row of straightened resistance wires, it can be short-circuited with thicker wires on the predetermined gauge distance, the resistance sheet has a paper bottom and a rubber bottom, the advantage is that the shape is simpler than the guarantee, and the transverse effect coefficient is close to zero.
So what kind of resistance strain gauge is the third foil resistor sheet? Let's take a look at the production first, it is glued on one side of the alloy foil (constantan foil or nickel-chromium foil) to form a rubber base, and then made by photographic corrosion forming method on the foil surface, the advantage is that the shape and scale are very precise, and because the resistance wire part is a flat and thin rectangular section, so the paste is strong, the heat dissipation performance of the wire is good, and the transverse effect coefficient is also low.
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