Measurement:
It is
defined as the study of physical and chemical parameters of any object by
comparing with standards.
The word
measurement is used to tell us the length, weight, temperature, colour or
change in any physical parameters of the material.
Instrumentation:
It is a technology of using instrument to measure and
control physical and chemical parameters/properties of the material.
Methods of measurement:
(a) Direct and indirect measurement.
(b) Primary secondary and tertiary measurement.
(c) Contact and non contact type measurement.
(a) direct and indirect
measurement
Direct
measurement: the value of physical parameters is determined by comparing it directly
with different standards.
Indirect
measurement: the value of physical parameters is determined by indirect
comparison with secondary standard calibration.
(b) Primary secondary and
tertiary measurements:
Primary measurement:
In this
measurement the physical parameters is determined by Reference standards.
Secondary and tertiary measurement:
The
secondary and tertiary measurement are indirect measurements involving 1
transmission are called secondary measurements. And those involving two
transmissions are called tertiary measurement.
Example:
temperature is measured by a mercury in a class.
Pressure is
measured by boundary tube.
(c)Contact and non-contact
measurements:
Contact measurement:
Sensing
element of a measuring device as contact with the medium.
Example:
thermometer.
Non-contact measurement:
Sensing
element of a measuring device does not have physical contact with the medium.
Example:
laser
Tags: ICS, measuremt, measuring,instrumentation