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CHAPTER 8 - DEVELOPMENT IN INSTRUMENTATION AND MEASUREMENT, NAIF SHAHMI…
CHAPTER 8 - DEVELOPMENT IN INSTRUMENTATION AND MEASUREMENT
FIBRE OPTIC TRANSDUCER
Work on the principle of alteration of light
External variables :
motion
pressure
temperature
Act as a light conductor
Material
glass
quartz
plastic
Application
Medium of data transmission
UniFi
Fibre optic pressure transducer
Fibre optic accelerometer
Fibre optic temperature sensor
Fibre optic flow sensor
Disadvantages
Alignment problems
Higher cost
Fragility
Advantages
Capability with fibre optic telemetry system
High sensitivity
Low weight and small size
Principles
The core diameter = 50um
Depends on
The size of core region
Single mode
Multi mode
A light tray is trapped by total reflection at the boundary of the core and the cladding material
Core region have a slightly higher refractive index than cladding
Consists of a thin, low-loss glass wire with core region
Total internal reflection
Reflection and Refraction
If light ray hit the material at an angle greater than critical angle it will completely reflected and not refracted
Pulse code modulation
To transmit analog single
Phone call
Attenuation
The gradual loss of intensity by signal
INTRODUCTION
Recent development :
Microcontroller on a single chip
Microsensor
Focusing on the use of :
Digital computers.
Development of new type sensor.
Latest development
The scale in down to nano size.
COMPUTER-AIDED MEASUREMENT AND DATA TRANSMISSION
Data can be transmitted over a :
Mainframe computer
From PC to mini
Distant location
Data Transmission
Serial
Handshaking process
Speed of transmission slow
Less cost compare to parallel
Parallel
Speed of transmission high
Each bits transmitted simultaneously one line being used for each bit
High cost
Microcomputer or PC are versatile
Can be interfaced to an experimental set up
Involving a number of sensors
Large amount of data is required to be stored
NAIF SHAHMI BIN SUKHAIMI(2018679698)
