Nanofilm technology has significantly enhanced the stability of pressure sensors.
2020-08-19
The main performance indicators for pressure sensors include accuracy (comprehensive accuracy), temperature characteristics, thermal influence performance, zero-point drift, long-term stability, and reliability. Long-term stability refers to the sensor's ability to regain its originally calibrated performance when recalibrated after a period of use—whether stored in a warehouse or operating online. Among the calibrated performance parameters, nonlinearity errors, temperature errors, and thermal influence errors within the comprehensive accuracy can all be corrected and compensated for using modern electronic technologies, thereby minimizing their impact on measurement accuracy. However, zero-point drift is a random error that cannot be corrected by circuitry. Even if a sensor boasts high accuracy and other favorable performance metrics, zero-point drift often renders the measurements unreliable. Given the critical importance of zero-point drift in reproducing performance specifications, stability indicators are frequently expressed as the maximum allowable zero-point drift error over a specified period under defined conditions, typically reported in units of "% FS/year."
The zero-point drift error of sensors can be minimized through careful sensor design, rigorous manufacturing processes, enhanced stability treatments, and proper installation, operation, and usage procedures. The advent of all-metal sputtered thin-film pressure sensors provides a prime example—these sensors are currently recognized worldwide as truly achieving extremely low zero-point drift errors (e.g., stability ≤0.01% FS/year). But why do metal nanofilm pressure sensors exhibit such outstanding performance? The reason lies in the atomic bonding between layers in the metal nanofilm, which significantly reduces the effects of interlayer slippage and adhesive aging—a common issue in layered structures like those used in bonded strain-gauge (printed thick-film) sensors. As a result, these sensors are free from hysteresis caused by creep. Moreover, they completely eliminate instability arising from zero-point drift due to factors such as temperature changes and organic adhesive aging. Thanks to their exceptional performance, metal nanofilm pressure sensors have experienced rapid development ever since their invention—and this trend shows no sign of slowing down even today. As the manufacturing costs of nanofilm pressure sensors continue to decline, their superior cost-performance ratio will make them viable alternatives to both ceramic pressure sensors and bonded strain-gauge pressure sensors.
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