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 waterspills 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.
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Gauge pressure measurement is a subtype of differential pressure measurement. The idea is to compare pressure at any point to the current atmospheric pressure. The Gauge pressure measurement is not consistent because the atmospheric pressure varies with altitude so it cannot be used in critical measurements. Still gauge pressure sensors are used in tire pressure and blood pressure measurements.
Where to use pressure sensors?
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