New Microsoft Office PowerPoint Presentation

Views:
 
Category: Education
     
 

Presentation Description

No description available.

Comments

Presentation Transcript

Transducers for displacement measurement:

Transducers for displacement measurement

What is a transducer?:

What is a transducer? Transducer is a device that converts input physical variable into convenient form Generally the output is in the form of electric signal Transducers are also known as prime sensors, pick ups and signal generators Transducers use almost mechanical and electric principles in signal conversion

Classification::

Classification: It is classified into : 1. primary / secondary 2. active / passive 3. analog / digital 4. mechanical , electrical and opto electrical

Primary/secondary:

Primary/secondary Primary: If transducer reacts directly to the change in quantity to be measured Ex: diaphragm in pressure guage Secondary: If an element which converts the output from the primary transducer into more use full form Ex: capacitance transducer attached to a bellow guage

Active / passive:

Active / passive Passive: Energy is taken from an auxiliary source LVDT ; resistance thermometer Active: Energy is required for conversion taken from input also known as self generating transducer Peizo electric and photo voltaic tranducer

Classification based on principle :

Classification based on principle Variable resistance transducers Variable inductance transducers Variable capacitance transducers Pizeo electric transducers Photo electric (or) light dependent transducers Ionisation transducers

Variable resistance transducers :

Variable resistance transducers Potentiometer transducer: Converts mechanical displacement into electrical output. Some are used for linear and some are used for angular measurement.

Linear and angular measurement :

Linear and angular measurement

Advantages and disadvantages :

Advantages and disadvantages Less expensive High output Available in different shapes and sizes Disadvantages Limited life due to wear and tear Noisy in operation during high speed operations Limited resolutions

Applications :

Applications Measurement of temperature Measurement of strain Measurement of force Measurement of flow

Variable inductance :

Variable inductance Transducers that use in change of air gap between them are called reluctance type Two types Variable self inductance Variable mutual induction

Variable self-inducatance single coil:

Variable self- inducatance single coil

Variable self-induction two coil type :

Variable self-induction two coil type

Variable mutual induction two coil type:

Variable mutual induction two coil type

Capacitance transducers :

Capacitance transducers Change in capacitance withChange in area –displacement , torque Change in distance- displacement,pressure . Change in dielectric constant- displacement,liquid level,density,volume,weight and density

Change in area(parllel plate type):

Change in area( parllel plate type)

Cylindrical type :

Cylindrical type

For angular:

For angular

Change in distance between plates :

Change in distance between plates

Differential arrangement :

Differential arrangement

Pizeo electric transducers:

Pizeo electric transducers

Photo electric transducers:

Photo electric transducers

Photo multiplier tube :

Photo multiplier tube

Photo conductive transducers :

Photo conductive transducers

Photo voltaic or solar cell:

Photo voltaic or solar cell

Ionisation transducers:

Ionisation transducers

Various resistance transducers and principle of operation:

Various resistance transducers and principle of operation

authorStream Live Help