Measure Pressure, Compute Weight

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities and you. In this blog we’ll be discussing pressure in  occupant safety systems.

Pressure sensors are commonly used to weigh the amount of air above them and compute altitude or weigh the amount of water above them and compute water depth. One of the frequent modern uses for converting pressure measurements to weight is in occupant safety systems. In this application, a pressure sensor measures the pressure in a silicone (silica) gel-filled bladder caused by the weight of a person or object sitting on a seat. Sufficient weight allows the air bag system to distinguish between an adult and a child or a bag of groceries or other object sitting on the seat. The detection system was necessitated by injury and even deaths of children that resulted from the detonation of the air bag for the front passenger’s seat in early systems.


A bladder used to measure pressure and compute the weight of passenger.  Image source:  Midsouth Rescue Technologies.

What do you think/Comments?
Do you have a pressure sensing question? Let me know and I’ll address it in an upcoming blog.
-Han Mai, Senior Marketing Specialist, All Sensors Corporation (