How is visibility assessed? What tool do we use to gauge visibility?
Visibility sensor is the distance at which we can clearly see and recognize objects in the air. Particles like fog, dust, smoke, or water droplets can affect it. People generally quantify it in meters (m). Here are some typical techniques for measuring visibility along with the instruments utilized for this purpose:
Visual Method:
The measurement of visibility occurs at the farthest distance from the ground. This is where a person with normal eyesight can see the outline of an object in the current weather. Manual observation remains a prevalent technique for assessing visibility in certain scenarios, such as at weather stations and airports. Staff gauge the visibility distance by viewing far-off objects without assistance.
Atmospheric Transmissometer:
This device measures atmospheric transmittance and is applicable for visibility measurement. It measures how much light passes through the atmosphere. It does this by sending and receiving an infrared beam. Then, it uses this information to calculate visibility
Automatic Laser Visibility Meter:
This device assesses visibility through the principle of laser scattering. It checks visibility by sending out a laser beam. It measures how strong the light is when it bounces back.
Visibility Sensor:
These sensors are often used to check visibility. They do this by measuring light scattering and absorption. This helps find out how many particles are in the air. These sensors usually use a laser or infrared light. They have a photodetector to notice changes in light intensity.
LIDAR:
This technology helps measure the amount and spread of airborne particles. It sends out laser pulses and times how long they take to return. This process helps calculate visibility. People often use LIDAR for long-range, highly accurate visibility assessments, such as those required for airport weather monitoring.
Visibility meter:
A visibility meter is a tool used to measure how far we can see. It usually uses optical methods to find the farthest distance visible to the human eye. Researchers frequently utilize this approach in terrestrial meteorological observations and vehicle navigation systems.
You can choose these techniques and devices based on your specific needs. Some methods require special tools and training for accurate measurements.
In real-world situations, choosing the right visibility measurement tools is important. This helps to get accurate and reliable results. The information provided is for reference purposes only; if needed, we advise consulting with professional and technical experts.
