AILF U10 User manual

User Manual
UAV Based Laser
Methane Leakage
Detector

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1 READ FIRST
Safety precautions, measuring
principle, technical parameter

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1.1 Safety Warning
Please read the following carefully before using this product and make sure it
is operated correctly.
Detection Laser
When the device is turned on, do not look directly or use an optical instru-
ment (such as a telescope or magnifying glass) to observe the laser on the
front of the instrument to avoid burning your eyes!
DANGER
The structure of the equipment is specially designed to connect with DJI un-
manned aerial vehicle. Please connect the equipment to the aircraft reliably
before take-off to avoid the danger caused by accidental falling off of the
equipment.
DANGER
When the device is turned on, do not point the laser at the eyes of other
people or animals. This action may cause accidental injury or damage!
DANGER

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Do not attempt to repair or replace the instrument parts yourself! When the
instrument does not work properly or prompts an error message, please
refer to the relevant description of this manual for repair operations, or
contact the manufacturer's technical staff.
CAUTION
When the device is not powered, the pitching portion can be rotated at will.
When the device is powered up, it is strictly forbidden to forcibly turn the
pitching part to avoid damage.
CAUTION

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1.2 Functional Description
UAV Based Laser Methane Leakage Detector (U10) is a gas detection device
for remotely measuring methane gas using a drone as a carrier. The device
emits a laser, an invisible infrared laser that measures the concentration per
unit (ppm.m) of methane gas present at a long distance.
1.3 Measuring Principle
“Methane molecules absorb light of a specific wavelength”
—— Molecular Absorption Spectroscopy
“The amount of light absorbed by a transparent medium (methane gas mass)
is proportional to the thickness of the air mass and the concentration of the
air mass”
—— Bill Lambert's law
According to the principle, a beam of a specific wavelength can be used to
penetrate the leaked methane air mass. According to the degree of weaken-
ing of the beam, the concentration of methane passing through the air mass
can be measured, and only the methane is responsive (the only choice).
ReeconLaser beam
Laser
Lens
Detector Reected beam Methane

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In the telemetry test, after the emitted beam passes through the leaked me-
thane air mass, it must be reflected by the reflecting surface, and then passed
through the air mass and returned to the detector, so that the instrument can
complete the measurement and output the unit concentration value.
Because the leaked methane air mass drifts with the wind, it is constantly
changing and unevenly distributed in space and time; the distance from the
instrument to the reflector is uncertain, and the thickness of the methane gas
mass is also uncertain. In order to be able to express the concentration values
in this case, the concept of unit concentration (ppm.m) is commonly used in
the industry to mean: methane concentration (ppm) x standard thickness (1
m).

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1.4 Unit Concentration（ppm.m）
“ The meaning of 100 ppm.m : to uniformly distribute 100 ppm of methane
gas on a gas mass of 1 m thickness. ”
It can be approximated that the unit concentration is the concentration after
the methane molecules on the straight line (laser detection line) between the
telemeter and the reflection target are uniformly "compressed" or "expanded"
into a region of 1 m thickness.
The instrument has a measured value of 100 ppm.m for a methane agglomer-
ate with a thickness of 5 m and a concentration of 20 ppm on the test line,
which corresponds to the air mass being "compressed" to a thickness of 1 m
and a concentration of 100 ppm.
1 m

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1.5 Parameters
Model U10
Measurement object methane (CH4)
Measuring principle Laser absorption spectroscopy
Detection laser Class IIIR
Static detection limit *1 5 ppm.m
Sampling frequency 500KHz
Response time 0.025s
Measuring range 0 ~ 50,000 ppm.m
Maximum distance *2 100m
Working temperature -20 ~ 50 °C
Operating humidity < 90% RH (no condensation)
Volume L155 × W 90 × H 100mm
Weight 520 g
Image sensor 720P, 1/2.8’, 12mm
*1 The static detection limit test condition is: 20 m gypsum reflection surface, static
measurement.
*2 The detection distance is closely related to the reflection condition. The value given
here is the detection distance in the general inspection environment.

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