Pressure sensor is used a lot, we often found that pressure sensor use for a period of time will have drift phenomenon. What causes the pressure sensor drift? We are in the design of how to eliminate pressure sensor drift?

The beginning of the pressure sensor development, diffusion silicon chips and using glass frit sealing between metal base, the disadvantage is that there are big stress of the pressure around the chip, even after annealing treatment, stress cannot be completely eliminated. When the temperature changes, due to metal, glass and diffusion coefficient of silicon hot aspect is different, can produce thermal stress, the sensor's zero drift. This is why the sensor's zero thermal drift is much larger than the chip's zero thermal drift. Using silver paste and terminal welding, processing is bad, easy to cause the contact resistance is not stable. Especially in the temperature changes, contact resistance are more likely to change, these factors are causes of the sensor when zero drift and temperature drift.

To eliminate silicon pressure sensor offset we can gold methods of fusion welding, will spread between silicon and the base of using gold eutectic silicon seal, because gold is soft small stress, pressure pipe is glass tube to the sintering of silicon ring, glass tube with high temperature adhesive joint and base, for the pressure gauge, outside the glass glue a metal tube, pass into the atmosphere. Article silicon diffusion resistance of the wheatstone bridge, a high doping method to form conductive book, bridge and distribution in the surrounding of aluminum electrode reliably connected, rather than adopting the usual steaming aluminum, the carved form aluminium strip method, it helps to reduce the sensor lag, aluminum with gold between electrodes and terminal pressure welding and ultrasonic welding, making contact resistance is stable.