What is the role of the temperature compensator in the resistance strain measurement? What's the requirement for it?
Temperature compensation is the measure to eliminate the influence of temperature. In the strain measurement at normal temperature, the bridge compensation method is adopted for the temperature compensation. It uses bridge characteristics to compensate temperature.
The resistance strain gauges are sensitive to temperature changes. When the environment temperature changes, due to the thermal expansion coefficient and the strain measured components of the linear expansion coefficient, and the resistance value of the sensitive gate varies with temperature, so the measured strain will contain the temperature change, can not reflect the actual strain component, therefore in the measurement must try to eliminate the influence of temperature change the.
1. compensation block compensation method of strain gauge pasted on the measured point in the component is called the work piece, the AB bridge access bridge; in addition to the strain gauge pasted the same specifications with the measured components of the same material but a piece of material is not involved in the deformation, and the component to be measured in the same temperature condition, known as the temperature compensating plate, connecting it with half bridge bridge work piece measuring bridge, another two bridge arm bridge for strain gauge internal fixation without a sense of standard resistance, the composition of arm bridge. The characteristics of the bridge can be seen that as long as the compensation plate is properly connected to the bridge road, the impact of temperature changes can be eliminated.This method does not require 2. work piece compensation compensation sheet and compensation block, but in the same component to be measured is pasted on several working strain gauges, according to the force characteristics and basic components of the bridge, will work correctly access bridge, can eliminate the strain caused by the temperature change of the strain, which needs to be measured get.
