A Simple, Low-Cost Micro-Coating Method for Accuracy Improvement and Its Application in Pressure Sensors

Abstract

The demand for high-accuracy pressure sensors has increased with the advancement of technology in a wide variety of applications. However, it is generally difficult and expensive to improve the accuracy of the pressure sensor because it usually depends on the sensing principle and the internal physical structure of the pressure sensor, varying with its material and production process. Thus, a simple, low-cost, and generally applied post-processing method is proposed to improve the accuracy of pressure sensors. In this method, a micro-coating is cladded on the surface of the sensor, which effectively isolates the adverse effect of the external environment, similar to applying a “micro-protective clothing” on the pressure sensor. Experiments on seven pressure sensors are conducted, in which the micron-thin parylene polymer is utilized as the surface-deposited coating layer to demonstrate the improvement of accuracy. Results show that the accuracy was improved, with an average increase of approximately 62.54% than before cladding, while the sensitivity was almost unchanged. The principle of improving the accuracy of this method was also analyzed. The proposed simple, efficient, and low-cost method of cladding micro-coating for enhancing the accuracy of sensors can be widely applied in various fields of industrial automatic control.

Ultrathin and Robust Micro–Nano Composite Coating for Implantable Pressure Sensor Encapsulation

“…Measurement Error of the Pressure Sensors. Based on the previous work, 59 the pressure sensor test system was established to measure the error of the pressure sensor. At room temperature (25 ± 1 °C), the pressure sensor was placed in a sealed pressurized chamber and pre-pressed at least three times.…”

Defect Filling Method of Sensor Encapsulation Based on Micro-Nano Composite Structure with Parylene Coating

“…Parylene C film coatings can be used for medical device protection. Medical devices coated with Parylene C can possess improved surface lubricity and biocompatibility to ensure their reliability in a damp environment [ 17 , 18 ]. In the body fluid environment, Parylene C film coatings can prevent the circuit in the devices from being damaged by water vapor to ensure that it can work stably in the salt solution environment implanted in the body and has good biological compatibility to ensure implantation safety [ 19 ].…”