2020-08-19
The sensing element of a sputtered thin-film pressure sensor is fabricated using vacuum deposition technology. Insulating materials, sensitive strain-resistance materials, and protective materials are deposited onto an elastic stainless steel diaphragm in atomic form, forming atomic-bonded layers such as an insulating film, a resistive sensing material film, and a protective film—all integrated seamlessly with the elastic stainless steel diaphragm. Subsequently, through processes including photolithography and resistance adjustment, a robust and stable Wheatstone bridge is created on the surface of the elastic stainless steel diaphragm. When the medium under measurement exerts pressure on the elastic stainless steel diaphragm, the Wheatstone bridge mounted thereon generates an electrical signal that is proportional to the applied pressure. After amplification, adjustment, and other signal-processing steps, combined with an appropriate structural design, this device becomes a thin-film pressure sensor or thin-film pressure transmitter that can be widely used across various fields.
2020-08-19
China’s nanofilm pressure sensors have now joined the world’s leading ranks.
In recent years, Sensor Nobleman Company has achieved numerous breakthroughs in the research and development of nanofilm pressure sensor technology as well as in product manufacturing. The overall performance of these film-based pressure sensors has reached world-leading levels, with some key indicators even attaining cutting-edge global standards. Without any compensation measures, the sensors’ comprehensive accuracy (including repeatability error, hysteresis error, and linearity error) exceeds 0.1% of full scale. The best zero-point temperature drift can reach as low as 0.0007% of full scale per degree Celsius. The calibration results for these products are shown in Figure 1. The operating temperatures of these products can reach 150℃, 200℃, 250℃, and even 380℃. Moreover, the long-term stability of the products is no greater than 0.1% of full scale per year, and the bridge arm resistance is not less than 5 kΩ.
2020-08-19
Comparison of Performance Among Different Sensitive Materials for Pressure Sensors
The strain-sensitive materials commonly used in pressure sensors include single-crystal silicon, polycrystalline silicon, or multi-component metallic materials such as NiCr alloys. The composition of NiCr alloy-based sensitive materials can be optimized according to the specific application environment or requirements of the sensor. For instance, if a very low temperature coefficient of resistance is required, appropriate elements can be added to reduce temperature drift at high or low temperatures and ensure humidity stability.
2020-08-19
After lasting three days, the world’s largest petrochemical exhibition—the China International Petroleum & Petrochemical Technology & Equipment Exhibition—came to a successful close on the afternoon of March 31. The exhibition attracted hundreds of well-known enterprises from both home and abroad, and was covered by dozens of domestic and international media outlets, including CCTV and the People’s Daily. With the advancement of electronic, information, and network technologies, petrochemical equipment is becoming increasingly intelligent, and these devices now incorporate a wide variety of sensor products.
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