This document discusses laser methods for level measurement. It describes lasers and their properties. There are two main laser level measurement techniques: time of reflection measurement and triangular measurement. Time of reflection measurement detects the time difference between when a laser pulse is transmitted and reflected to identify the distance to the material surface. Triangular measurement uses a laser source and CCD placed at an angle to receive two reflections, one from the top level and one from the base, to determine the material level in a tank. Laser methods provide non-contact, accurate measurements but can be affected by shiny surfaces and dusty/smoggy environments.

1. LASER
METHODS FOR
LEVEL
MEASUREMENT
INDEX-180598L
NAME-Sharanga K. M. H. G.
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What is Laser ?
 A laser is a device
that emits light
through a process of
optical amplification
based on the
stimulated emission of
electromagnetic
radiation.
 The light emitted from
a laser is
monochromatic,
powerful, highly
directional, and
coherent. 02

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Laser methods for
level measurement
 Laser method is indirect type level measurement
technique.
 The working principle of laser level measurement is
detecting the time taken by laser source for
transmission and reflection back from the material
surface.
 There are two main techniques using in laser level
measurements.
1. Time of reflection measurement technique
2. Triangular measurement technique
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 In this technique, a strong and
highly forced laser pulse is used
to measure material level in
equipment.
 Detecting the time difference
between transmitted and reflecting
identifies the distance from top to
material surface level.
Time of reflection measurement
technique

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 This technique based on a
laser source is transmitted
towards the material and the
reflection is captured by a
charged coupled device placed
(CCD) at an angle to the laser
source.
 There are two reflections
received to the CCD, one from
the top level and second from
the base of the tank.
 Using this two reflection can
identify material level in
tank.
Triangular measurement
technique

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Advantages and disadvantages
of laser methods
Advantages Disadvantages
Non-contact measurement type Very expensive
Can use in vacuum services Shiny surfaces does not affect
positively.
Less interface effects from welding
joints and other parts as laser
beam runs parallel.
Environments which are dusty and
smoggy are not suitable.
Highly accurate.

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Level measurement
devices use lasers

8. Thank
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