Table of Contents
Linearity is an important characteristic of strain gauges and force sensors, indicating how accurately these devices measure within their specified range. Ensuring linearity helps in obtaining precise and reliable data for various applications. Several practical methods are used to assess the linearity of these sensors.
Calibration with Known Loads
This method involves applying a series of known forces or strains to the sensor and recording the output. The data is then analyzed to determine how closely the sensor’s response follows a straight line. A linearity plot can reveal deviations from ideal behavior.
Graphical Analysis
Plotting the sensor output against the applied load or strain provides a visual assessment of linearity. A straight line indicates good linearity, while deviations suggest non-linear behavior. Regression analysis can quantify the degree of linearity.
Calculation of Linearity Error
Linearity error is calculated by comparing the actual sensor output to the ideal linear response. The maximum deviation within the measurement range is expressed as a percentage of the full-scale output. Lower values indicate better linearity.
Additional Methods
- Using specialized calibration equipment
- Applying polynomial fitting to the data
- Conducting repeatability tests