Types of visibility meters

Visibility measurements are mainly optical - the scattering of light by suspended particulate matter in the atmosphere is utilized to measure visibility. A commonly used instrument is the visibility meter, the core components of which are the transmitter and receiver. The transmitter sends out a beam of visible light, which is scattered in the atmosphere, and a portion of the scattered light is picked up by the receiver. By measuring the intensity of the received scattered light, the visibility meter can calculate the value of visibility. Depending on the measurement principle, visibility meters can be categorized into transmission and scattering types.

Transmission type visibility meter is a transmitter and receiver are installed in two points with fixed relative positions, and the visibility is calculated by measuring the propagation loss of light between the two points. This type of instrument is suitable for scenarios with long straight-line propagation distances, such as highways. However, the measurement results of transmission visibility meters are affected by factors such as atmospheric humidity, particle concentration and particle size. A scattering visibility meter is one in which the transmitter and receiver are mounted at the same location and the visibility is calculated by measuring the intensity of the scattered light. This type of instrument is suitable for measurements over shorter distances, such as airport runways. Measurement results of scattered visibility meters are mainly affected by atmospheric humidity and particulate matter concentration. Overall, transmission and scattering visibility meters have their own advantages and disadvantages, and you need to choose the right instrument according to the specific application scenario.

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