Method for measuring brightness outside highway tunnel

A technology of highway tunnels and measurement methods, applied in the field of brightness measurement outside highway tunnels, can solve the problems of limited test conditions, poor applicability, time and weather restrictions, etc., and achieve accurate and reliable measurement results, wide application, and easy operation. Effect
CN104034413AInactive Publication Date: 2014-09-10WUHAN ZHONGJIAO TRAFFIC ENG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
WUHAN ZHONGJIAO TRAFFIC ENG CO LTD
Publication Date
2014-09-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for measuring brightness outside a highway tunnel. The method includes the steps that A, the relation between brightness values of scenes outside the highway tunnel and the illumination value of the horizontal plane is determined, and a brightness meter and an illuminometer are used at the position away from a tunnel portal by a safe stopping sight distance for reading at the same time and obtaining brightness values L of scenes of the tunnel portal and the illumination value of the horizontal plane E; B, the computation standard value of brightness of the scenes outside the highway tunnel is determined, and the hourly total illumination and scattering illumination of regions in a typical meteorological year are obtained through radiation observational data and radiation light equivalent models of the regions; C, the area percentage of the scenes outside the highway tunnel within the view field of the cone angle of 20 degrees is determined, and the border line of the view field of the cone angle of 20 degrees of a driver at the position away from the tunnel portal by a stopping sight distance is drawn out on each picture of the tunnel portal; D, the value L20 (S) of brightness outside the highway tunnel is determined according to an environmental diagram method. The method is easy to implement, easy and convenient in operation, accurate and reliable in measurement result, and capable of being widely applied to measuring the brightness outside existing highway tunnels.
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Description

technical field

[0001] The invention belongs to the technical field of road tunnel lighting, and more specifically relates to a method for measuring the brightness outside a road tunnel. Background technique

[0002] The "black hole effect" formed by the sharp brightness, space, and transition of reference objects at the entrance of the highway tunnel makes it difficult for drivers to adapt to the vision, and it is easy to form a blind period of vision, which in turn induces traffic accidents such as rear-end collisions and collisions with tunnel doors. Therefore, enhanced lighting is generally installed at the entrance of the tunnel to alleviate the "black hole effect" and ensure the safety and comfort of driving at the entrance of the highway tunnel. Luminance L outside the highway tunnel 20 (S) is an important basis for the design of the enhanced lighting system at the entrance of the tunnel. It is of great significance to reasonably determine the brightness outside the ...

Claims

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