Table of Contents
Introdcution
The physical quantity
Working principle
Pressure sensors types
Applications
References
The physical quantity
Static pressure is the ratio of the perpendicular element of force to the element of surface it is exerted on.
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Some applications are
1. Touch screen devices
- Smart phones and - Some some computer devices come with pressure sensors.- Sensors in those devices determine where the pressure has been applied and inform the processor by generating electric signal. There are two or more sensors fitted at the the corner of the screen to give precise location where actually the pressure has been applied.
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2. Automotive industry
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and security
Pressure sensors have great application in automotive industry and security system. They help to - monitor oil and coolant pressure - regulate there by regulating appropriate power pressure in accelerators and brakes. Pressure sensors are usually incorporated in the radiators fill cap and the pressure inside the radiator ranges from 0.6 bar to 1.0 bar.
When the temperature of the coolant rises up then the pressured in the closed system also increases which is then notified by the pressure sensor which opens the valve and the excess fluid is dumped into the overflow container.
Besides, pressure sensors have very important role in security system such as anti-- Anti-locking braking system (ABS) and air bag system. Pressure sensors fitted into the automobiles work under ECU. ECU detects uneven (fast/slow) rotation of wheels during driving which then inform the pressure sensor to detect the specific parts of the problem and apply more or less pressure to give even wheel rotation.- Air bag system
Similarly, when the pressure is applied to the airbag control unit, then the pressure sensor fitted into the system determines the direction of impact and the restraint device is activated within 15-30 millisecond of the crash. This quick response of the system helps to prevent the passenger from possible dangers.
3. Bio medical instrumentation
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