Pressure sensor:
Introduction:
Pressure sensor's function is based on physical phenomenon. It can be used at least two different
situation: water, air or between two points of measurement.
Types of pressures and basic physics of pressure sensing:
Static pressure is a definition for physical pressure.
For example you would be skiing or walking somewhere and this sensor type will register your steps.
P (pressure) = F (force) / A (area), m^2)).
Force unit can be determined by F= m*a, (mass*acceleration).
Volume pressure, known as the density can be used when determining the volume of the container.
p (rho) = m (mass) / V (volume).
Archimedes's principle states can be determined by for example a person goes bath and the water
spills over bathtub. The amount of spilled water has the same volume than a person.
Physical formula is: P= p*h*g
P = p (rho) * h (height in metres) *g (gravitation force (9,81 m/s^2))
Pascal's law states that an increase in pressure at any point
in a liquid causes a corresponding increase at every other point in the
liquid.
For example if pressing a cylinder on the other side and because of the water is solid,
second cylinder will be pulled out upward.
This method is a common in for example car brakes.
http://www.sensorsmag.com/sensors/pressure/fundamentals-pressure-sensor-technology-846
Group members: Kiia Tammi, Mikko Heiskanen and Aleksi Väisänen