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CHAPTER 8 DEVELOPMENT IN INSTRUMENTATION & MEASUREMENT - Coggle…
CHAPTER 8 DEVELOPMENT IN INSTRUMENTATION &
MEASUREMENT
INTRODUCTION
Development in instrumentation & measurement are focusing on the use of digital computers and development of new type sensor.
The development of silicon microsensor and inclusion of microcontroller on a single chip are the recent development. Even, latest development the scale in down to nano size.
Computer-aided measurement and data transmission
The data can be transmitted over a distant location or from the PC to the mini or mainframe computer
Data transmission can be divided into two modes:
a. Parallel transmission.
• Each bits transmitted simultaneously one line being used for each bit.
b. Serial transmission
• Each bits transmitted one by another which all the bits and the position and duration is controlled and keep track of.
Fibre Optic Transducer
optic is a type of sensor which work on the principle of alteration of light by external variable like motion, pressure, temperature, flow, strain and etc.
The principle
• Consists of a thin, low-loss glass wire with a centre /core region.
• Core region have a slightly higher refractive index compared than cladding.
• A light ray propagating in the fibre is trapped by total reflection at the boundary of the core and the cladding material.
• Depends on:
• The size of core region
• Single mode / multimode fibre
Advantages
Enhance safety due to its non-metallic construction and absence of high voltages, sparks
Applications?
Major application is as a medium of data transmission. Transpacific data cable (internet). UniFi.
Fibre optic pressure transducer
Fibre optic accelerometer
Fibre optic temperature sensor
Fibre optic flow sensor
