Instruction Manual

78
White Noise Method
To detect the location of a leak with the
correlator, it is necessary to know the following
data about the pipes: the pipe material, the pipe
diameter (sound velocity), and the distance
between the pre-amplifiers.
Measurement is not possible if any of the above
three items are missing.
However, depending on the site, some of the
pipe data may be unknown.
The white noise method is a workaround for
such cases.
The white noise method can be used in the
following three cases.
Required items
Case
Pipe
material
Pipe
diameter
Velocity
Distance
①
?
?
?
②
?
③
?
(Estimated
value)
?
Using the white noise method, calculate the item
identified with ? .
After calculating the unknown items, enter the
pipe data.
- Principle of the white noise method -
In the white noise method, a vibration generator
is installed at the same position as one of the
pre-amplifiers, and the speed of sound and the
distance between the pre-amplifiers are
calculated from the time difference between the
vibration sounds transmitted between the
pre-amplifiers.
The setup for the white noise method is shown
below.
Install a vibration generator (oscillator and
vibrator) at the same position as one of the
pre-amplifiers.
Note
The white noise method can be used as long as
the section between pre-amplifiers consists of
only one type of pipe.
It cannot be used when there are multiple types
of pipe.
● The vibration generator system is sold
separately.
Please contact your agent for details.
● The same procedure applies when using four
pre-amplifiers.
The specific procedures are explained starting on
the next page.
White noise
generator
12V DC
battery
Oscillator
Pre-amplifier
(Blue)
Pre-amplifier
(Red)
Leak location