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BENEFIT OF ULTRASOUND TECHNIQUE TO FIND GAS LEAK (COMPRESSED AIR OR
OTHER ELSE GAS IN PRESSION / DEPRESSION)
W
HEN A GAS MOVE FROM A HIGH PRESSURE STATE
(
PRESSURE STATE
LEAK IN A PIPE FOR EXAMPLE
PHENOMENON WHICH CREATE A TURBULENCE
P atm
P int= 6 Bar
T
HIS TURBULENCE GENERATES A NOISE WITH LARGE FREQUENCY SPECTRUM WHICH CONTAINS THE ULTRASOUND
(
FRICTION OF THE MOLECULES
AIR FOR EXAMPLE
HUMAN HEARS CORRECTLY UP TO
.
FREQUENCY
T
,
HIS IS WHY
BY USING VERY SENSITIVE ULTRASONIC DETECTOR AND HETERODYNE TECHNIQUE
H
,
K
Z
IT IS POSSIBLE TO FIND AND LISTEN TO THE LEAK
W
HY ULTRASONIC WAVES ARE EASY TO FIND WITH AN ULTRASONIC DETECTOR
-
T
HEY ARE VERY DIRECTIONAL
-
T
HEY GENERATE A STRONG ULTRASONIC INTENSITY NEAR THEIR EMISSION SOURCE
LEAVING AWAY FROM THE LEAK
-
T
HEY CAN BE EASILY HEARD THANKS TO HETERODYNE TECHNIQUE
(
,
HERE
ULTRASOUND NOT AUDIBLE FOR HUMAN
-
T
HEY CAN BE DETECTED IN A NOISY INDUSTRIAL ENVIRONMENT
☺
ULTRASOUND TECHNOLOGY HAS THE MAJOR ADVANTAGE TO BE EASY TO USE AND ACCESSIBLE TO EVERYONE
All manuals and user guides at all-guides.com
(
COMPRESSED AIR IN A PIPE AT
,
WITH EXTERNAL ATMOSPHERE PRESSURE
(
1).
SEE FIG
Emitted ultrasound
Pschittt !
1
FIG
)
THROUGH THE ORIFICE
20
H
. S
,
K
Z
O
HUMAN DOES NOT HEAR THE ULTRASOUND WHICH ONLY START AT THIS
,
.
EASILY
,
THEY EMIT IN A PRECISE DIRECTION
)
TO LOW FREQUENCY
6 B
AR FOR EXAMPLE
),
THERE IS A DEPRESSION
P int= 6 Bar
.
,
OFTEN CENTERED AROUND
?
,
DECREASING QUICKLY WHEN
(
DEMODULATION OF A HIGH FREQUENCY WAVE
(
))
AUDIBLE FOR HUMAN
,
CORRECTLY FILTERED BY THE DETECTOR
)
TO A LOW
,
DUE TO THE
40
.
2
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