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DEVELOPEMENT IN INSTRUMENTATION AND MEASUREMENT - Coggle Diagram
DEVELOPEMENT IN INSTRUMENTATION AND MEASUREMENT
INTRODUCTION
Focusing on the use of digital computers and
development of new type sensor
Recent development
microsensor
microcontroller on a single chip
Down to nano size.
COMPUTER-AIDED MEASUREMENT AND DATA TRANSMISSION
Micocompressor or Pc are versatile
Data can be transmitted over a distance location
Divide into two modes
parallel transmission
Each bits transmitted simultaneously
one line being used for each bit
High speed of transmission
High cost due to increased number of
wires
serial transmission
Each bits transmitted one by another which all the bits and position and duration is controlled and keep track of. (handshaking
process)
Slow speed of transmission
Low cost
FIBRE OPTIC TRANSDUCER
Type of sensor which work on the principle of alteration of light by
external variable
pressure
temperature
motion
Act as light conductor consist of thin strands of dielectric material
quartz
plastic
glass
Principle
Consist of thin, low glass wire with a centre/core region.
Core region had slightly higher refractive index compared than cladding.
A light ray propagating in the fibre trapped by total reflection at the boundry of the core and
the cladding material
Depends on
single mode/ multimode fibre
size of region
Average value of core diameter is 50 micrometer
Applications
Medium of data transmission (major)(internet)
Fibre optic pressure transducer
Fibre optic temperature sensor
Fibre optic accelerometer
Fibre optic flow sensor
ADVANTAGES
Enhance safety due to its non-metallic construction
Capability used in harsh environment
Low weight and small size
High sensitivity and high responses
Compatibility with attached to modern electronic circuit
DISADVANTAGE
Fragility
Alignment problems due to small size of optical components
High cost due to new technology.
