Meaning
Standardized procedure for correlating the electrical output of a thin-film pressure sensor to known mechanical loads to ensure accurate data during cell testing. Performing tactile sensor calibration is necessary because these sensors can vary in sensitivity depending on the environmental conditions and the duration of use. The process involves applying a series of precise weights or pressures to the sensor and recording the resulting signal.
This creates a mathematical relationship that the software uses to convert electrical readings into pressure values. Reliable data is only possible if this step is performed regularly.
Sensitivity Curve
Establishing the relationship between force and voltage is the core goal of the process. During tactile sensor calibration, the technician generates a curve that shows how the sensor responds across its entire operating range. Most thin film sensors are non-linear, meaning the signal does not increase at a constant rate.
The software must use a complex formula to account for this behavior and provide accurate results. High pressure and low pressure regions may have different levels of precision. Ensuring the sensor is accurate in the range relevant to battery testing is the priority.
Error Mitigation
Factors like temperature and humidity can influence the performance of the sensing elements. A thorough tactile sensor calibration accounts for these variables by testing the sensor in a controlled environment. This reduces the uncertainty in the measurements and provides more defensible data for the engineering team.
Creep is another issue where the signal changes over time under a constant load. The calibration process includes steps to measure and compensate for this effect. Without these corrections, the pressure maps would be misleading and could lead to poor design decisions.
Repeatability Standard
Consistency in the testing process allows for the comparison of data across different batches of sensors. Following a strict tactile sensor calibration protocol ensures that the results are repeatable and can be verified by other laboratories. This is essential for meeting the quality standards required by automotive and industrial customers.
The calibration records provide a traceability path for the data collected during the assembly of battery modules. Regular checks prevent the use of degraded sensors that could hide mechanical issues. Accurate pressure data is the foundation of a safe mechanical design.
