5 Absolute Pressure Example: Detailed Facts

In this article I’m going to describe elaborately the definition and basics of absolute pressure equipped with absolute pressure example.

Whenever we feel the heavy flow of wind actually we feel the pressure of the air molecules. But there are no air molecules available in the space that is why pressure is absolutely zero in space. So the pressure which is measured above the absolute zero pressure of space or vacuum is known as Absolute pressure.

4+ absolute pressure example are given and described below:

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Diagram of Absolute Pressure from wikipedia

Sensors that are based on the principle of Absolute pressure

A sensor that acts on the principle of absolute pressure is a secured structure from which we can get readings of measurement of pressure that don’t include the effects of atmospheric pressure in them. Basically these sensors are semiconductor devices. There are wafers,N type semiconductors like silicon,polysilicon etc and piezoelectric materials available in the construction of pressure sensors.

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Manifold Absolute Pressure(MAP) sensor from wikipedia

Combination of four resistors in the form of a wheatstone bridge is used here to cut the errors and to get a large output. In this type of sensor one of the edges that is out of contact of the pressure medium is revealed to a perfectly vacuum chamber which is closed forever and the other edge gets pressure from liquids or gasses. Piezoelectric effect is also produced here to get voltage that depends on absolute pressure. As this closed vacuum chamber is used as the absolute zero point by the diaphragm,the distortion of this never gets affected by the influence of the atmospheric pressure.

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Sensors that are based on the principle of Absolute pressure from wikipedia

These sensors are mainly used in the health industry and the food industry. In the health industry medicines and other medical products like injection syringes,scissors,knives that are used in operations should be sanitized and bacteria-free for the sake of safety of patients. So here packages should be air free which can be availed by using absolute pressure sensors. In the food industry foods also need vacuum packagings so that they can be preserved for a long time. These sensors which operate on the basis of absolute pressure mainly used to maintain an air free environment and resist the foods from being damaged.

Gauges that are based on the principle of Absolute pressure

Sometimes in the research laboratories where experiments based on weather conditions are being done, alteration of atmospheric pressure creates a huge problem to achieve the desired result. So here the gauges based on absolute pressure are used to make the experiment environment air free and vacuum in nature so that experimental readings should be perfect. These gauges are also used by aeronautics to avoid fluctuating atmospheric pressure and to get perfect measurement of altitudes. They also have uses in the food industry.

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Gauge based on absolute pressure from wikipedia
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Digital pressure gauge from wikipedia

Transmitters that are based on the principle of Absolute pressure

These kinds of transmitters are able to operate in vacuum. Pressure is measured by them in a completely air free environment. No external factors like changing weather conditions can influence them. In these transmitters the mechanical energy is converted into the electrical energy which in turn emits out in the form of electrical signals. 

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Transmitter that acts on Absolute pressure from wikipedia

Actually these types of transmitters are attached to the sensors which work on absolute pressure. The sensors used to send the outputs to the electrical unit where the absolute pressure is being calculated. After that this signal is transmitted through the transmitter. Transmitters related to absolute pressure are of two types- one is analog and the other is digital. The digital one converts the analog signal into digital.

In today’s world these types of transmitters are used to measure the altitudes,that is why these have wide usage in the navigation industry which has to deal with the directions and altitudes. Weather forecasting has become easier with the help of these modern transmitters that are based on the principle of Absolute pressure. There is no need for weather forecasting stations these days,pressure,temperature,humidity etc can be calculated through transmitters that are attached in computers,laptops and smartphones. These also have usage in the automation industry. They are used to measure the pressure of the engine of cars. They are also used in measuring depth of water of a well.

Transducers that are based on the principle of Absolute pressure

This kind of transducers contain a rigid tube,a flexible tube and a pipe wall. They are built on piezoelectric materials. They can measure dynamic as well as static pressure. These transducers usually convert the mechanical energy which is the applied pressure into the electrical energy in the form of signals. Every pressure transducer needs a supply voltage so that its internal circuit can work properly. Transducers that act on absolute pressure are usually a closed cavity that is placed inside an absolute sensor. These types of transducers help in detecting fluctuations of the barometric pressure.

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Transducers that are based on the principle of Absolute pressure from wikipedia

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