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Strain Gauge Pressure Transducers

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by

Adelyce Darling

on 14 October 2013

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Transcript of Strain Gauge Pressure Transducers

How does it work
Strain Gauge Pressure Transducers
by Joevie Anne A. Catilo ICE-4101
Strain Gauge Pressure Transducers
What is a strain gauge pressure transducer?
STRAIN GAUGE
Pressure
Transducers

What are the important terms that we should know?
What are the types of strain gauge pressure transducers?
What are the applications and uses of the instrument?
This presentation will discuss the elements comprising strain gauge pressure transducers that will give us a better understanding of how the instrument works and its uses.
What is a strain gauge pressure transducer?
What are the important terms that should we know?
What are the types of strain gauge pressure transducers?
What are the applications and uses of the instrument?
How does it work?
There are 3 basic principles of the strain gauge transducer from where its functions are done. They are the deformation, the change in the electrical resistance and the compensation for the changes in. The pressure conversion is one of the most common uses of the stain gauge. There are also many other uses associated with the strain gauge and it helps in many things.
Parts of a Strain Gauge Pressure Transducer
Strain Gauge-
A strain gauge is a long length of conductor arranged in a zigzag pattern on a membrane. When it is stretched, its resistance increases.

Pressure Transducer-
A pressure transducer contains a diaphragm which is deformed by the pressure which can be measured by a strain gauged element.The pressure transducer is the transducer which converts the pressure to an electrical signal of the analog type.
Wheatstone Bridge-
Strain gauges are mounted in the same direction as the strain and often in fours to form a full 'Wheatstone Bridge'. It can be set in three different ways such as – full bridge, half bridge or quarter bridge.
where:
R = resistance of the wire grid in ohms
K = resistivity constant for the particular type of wire grid
L = length of wire grid
A = cross sectional area of wire grid

Electrical Resistance Type Strain Gauge
Variable Inductance Type Strain Gauge
Unbonded Strain Gauge
an unbounded strain gauge has a resistance wire stretched between two frames. The rigid pins of the two frames are insulated. When the wire is stretched due to an applied force, there occurs a relative motion between the two frames and thus a strain is produced, causing a change in resistance value. This change of resistance value will be equal to the strain input.
Bonded Strain Gauge
A bonded strain gauge will be either a wire type or a foil type as shown in the figure below. It is connected to a paper or a thick plastic film support. The measuring leads are soldered or welded to the gauge wire. The bonded strain gauge with the paper backing is connected to the elastic member whose strain is to be measured.
Pressure Measurement
Pressure is known to be the force that is exerted due to the weights of different gases and liquids. Some common examples are atmospheric pressure and the pressure implied by liquids inside the walls and underside of a container.

Pressure can be measured as the force exerted over a certain area.

Pressure = Force/Area
Acceleration
Measurement
velocity is a time derivation of displacement and displacement is the time integral of velocity. Similarly, we can also say that acceleration is the time derivative of velocity. Thus, a velocity transducer/sensor is enough to measure acceleration.
Temperature Measurement
Temperature measurement sensors can be divided into two categories. They are – Measurement using change in resistance and measurement using change in voltage.

The temperature sensor that uses change in resistance to measure temperature is called a resistance thermometer. Resistance thermometer can be further classified into Resistance Temperature Detectors (RTD) and Thermistor.

The temperature sensors that use change in voltage to measure temperature are Thermocouple and Thermopile
Full transcript