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A Best Luminance meter that directly measures the average brightness of the road ahead, including an objective lens, a reflector with a characteristic hole, a filter, a detector, a signal processing and display unit, a plane reflector, and a visual observation system. Among them, the objective, with The characteristic hole reflector, filter and detector constitute the measurement optical path, the objective lens, the characteristic hole reflector, the plane mirror and the visual observation system form the visual observation optical path. The characteristic hole reflector adopts the trapezoidal characteristic hole, which makes Best Luminance The meter realizes the trapezoidal measurement field of view. During the measurement, the trapezoidal field of view can be easily aligned with the visual trapezoidal road area to be measured through the visual observation system, and the average brightness of the road ahead can be quickly measured.
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