Portable Visibility Meter

Portable Visibility Meter User Manual.pdf

Q1: What is a portable visibility meter?
A1: Portable visibility meter is a kind of portable meteorological equipment for real-time measurement of atmospheric visibility, which is mainly used for safety monitoring in traffic, aviation, navigation and other fields. It is suitable for traffic safety early warning in low visibility weather (such as fog, haze, rain and snow), such as highways, airport runways and ship navigation.

Q2: How does a portable visibility meter work?
A2: The working principle of portable visibility meter is to retrieve visibility by measuring the intensity of scattered light from a specific angle by atmospheric particles. The visibility meter emits a beam of near-infrared light or laser to irradiate particles (fog drops, dust, etc.) in the atmosphere at a certain angle, and receives the scattered light signal of the forward scattering angle. The receiver converts the scattered light signal into an electrical signal, and the scattering coefficient (σ) is derived by a pre-calibrated algorithm, and it is assumed that the extinction coefficient (β ≈σ) is established under the condition of homogeneous atmosphere. According to the formula MOR = -ln(0.02)/β, the meteorological optical visual range (MOR) is calculated, and the visibility value is directly output.

Q3: What is a portable visibility meter used for?
A3: Traffic safety monitoring: real-time detection of road visibility in foggy, rainy and snowy weather, providing early warning data for highways, airport runways and ship trips.
Emergency disaster response: quickly deploy and monitor disaster sites such as fires and sandstorms to provide real-time visibility data for rescue operations.
Meteorological environmental protection application: supplement the monitoring blind area of fixed weather stations and evaluate the degree of air pollution.
Agricultural disaster prevention: monitoring farmland fog to prevent frost disaster.
Major event guarantee: provide weather monitoring for outdoor activities such as sports events.

Tips: What does the portable visibility meter measure?

Portable visibility meters are used to measure atmospheric visibility, quantifying the maximum distance observable by the naked eye through scattering.

1. Atmospheric visibility range: This refers to the maximum horizontal distance at which an observer can clearly discern the outline of an object, typically measured in meters or kilometers. This is calculated by measuring the atmospheric extinction coefficient or scattered light intensity and applying empirical formulas.
2. Meteorological Optical Range (MOR): A visibility indicator defined by international standards, calculated based on the luminous flux attenuation of an incandescent light source under specific conditions.

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