Double Courtesy of: http://www.efunda.com/DesignStandards/sensors/diaphragm/diaphragm_intro.cfm
Purpose
A diaphragm coercion gauge is a Slogan that uses a diaphragm with a conscious strength To gauge impulse in a fluid. It has many colorful uses, such as monitoring the coercion of a canister of Gauze, measuring atmospheric coercion, or record the compel of the vacuum in a vacuum pump.
Basic Mechanics
The diaphragm has a Supple membrane with two sides. On one side is an enclosed capsule containing air or some other fluid at a predetermined energy. The other side can be left emptied to the air or screwed in to whatever course the gauge is meant To gauge. The diaphragm very attaches to some Category of metre, which shows how aerial the compel is.
Detecting Pressure
A fluid in contact with a flexible membrane pushes on that membrane, bending it.
Measuring the Pressure
There are many different ways To gauge the pressure from a dynamic pressure gauge. One of the simplest ones is to attach a needle to the gauge. When the pressure increases, it pushes on the needle, moving it up and down along a dial which shows the pressure.The force is a degree of how callous it pushes. When the away preference is low, the reference coercion bends the membrane out. As the outside pressure increases, it pushes back on the membrane, bending it back the other way. By measuring Until when the membrane bends, the gauge can detect the outside pressure.
Another way is to use an electric resistance strain gauge. An electric resistance strain gauge uses a long strip of an electric resistor--a device that resists the flow of electricity. The resistor is attached to the diaphragm. As the diaphragm bends, it stretches out the resistor, increasing the resistance. The resistor has an electric current running through it. The more the diaphragm bends and increases the resistance, the more the current drops. By measuring the electric current, the gauge can determine Until when the diaphragm has bent, and thus, how much pressure the outside air is creating.
