Which factors can cause error in the measurement output of strain sensor?
Which factors can cause error in the measurement output of strain sensor?
Error sources in resistance strain gauges measuring system are numerous; for example, error due to the transverse sensitivity of the strain gauges, error due to temperature, error due to misalignment, and error due to the Wheatstone bridge’s nonlinearity.
What are the factors affecting the selection of gauges?
The following factors govern the choice of a different(particular) gauges:
- Cost of construction and funds available for the railway project.
- Volume and nature of traffic.
- The intensity of population.
- Industrial and commercial development of the locality.
- Prospects of future development of the area.
What is the accuracy of strain gauge?
Therefore, to measure the strain, you have to accurately measure very small changes in resistance. For example, suppose a test specimen undergoes a strain of 500 me. A strain gage with a GF of 2 exhibits a change in electrical resistance of only 2 (500 x 10-6) = 0.1%. For a 120 Ω gage, this is a change of only 0.12 Ω.
Why do engineers perform strain gauge measurement?
Strain gauges are devices used to determine material strain due to static and dynamic loads coming from internal and external sources such as mechanical, thermal and pressure. As the specimen is deformed by loading, the foil within the gauge is deformed, which causes the electrical resistance to change.
Can strain gauge measure displacement?
A strain gauge based displacement transducer for measurement of the displacement in the range of 0 to 10 mm is reported. As compared to LVDT this transducer has short body length and is free from electromagnetic effect. this transducer has short body length and is free from electromagnetic effect.
What are the common causes of gross errors in strain gauges?
Another gross error is if the strain gauge has only a partial internal connection with the surface of the component being examined. Causes may include: poor cleaning or improper handling of the application surface and superimposed adhesive. These causes must and can be avoided. The rubber eraser test generally clarifies the situation.
How do I zero the strain gage factor?
With the circuit complete the amp zero dial should be used to achieve a zero readout, then by pressing the gage factor button will allow for the input of the strain gage factor. The Run button and Balance knobs can be used to calibrate and zero out of the system.
Why does the strain gauge creep back along the outer edge?
In actual practice, however, alignment and other installation errors occur despite great care. The strain gauge, as a spring element subject to mechanical stress, creeps back along its outer edge areas after spontaneous strain due to the strain loading and also depending on the rheological properties of the adhesive and the strain gauge carrier.
Why is the active length of the strain gauge important?
As a result of this, if the wrong active length of the strain gauge is chosen, the values measured for strain and material stress will be too small or too large. This is especially important when determining the maximum values of the mechanical stress peaks metrologically. The temperature response of the strain gauge affects the zero point.
