Brightness meter

Abstract

The invention discloses a brightness meter. The brightness meter comprises a machine shell; light beams to be measured enter into the machine shell through a lens; an ostiole reflector and a photoelectric detector are arranged in the machine shell, a V(lambda) modified color filter and a V' (lambda) modified color filter are arranged in front of the photoelectric detector, and the photoelectric detector respectively measures the photopic vision brightness value and the scotopic vision brightness value of a measure target and obtains a mesopic vision brightness value by calculating. One brightness meter of the invention can measure the photopic vision brightness value and the scotopic vision brightness value conveniently, the mesopic vision brightness value can be obtained through calculation, the operation is simple and convenient, and high-accuracy measurement can be easily realized.

Description

a luminance meter 【Technical field】 The invention relates to a light radiation measuring device, in particular to a brightness measuring device for realizing photopic vision, intermediate vision and scotopic vision. 【Background technique】 When the brightness of the light stimulus exceeds 10cd / m2, the cone cells of the human eye obtain vision, which is called photopic vision. The photopic vision efficiency function V(λ) stipulated by the International Commission on Illumination (CIE) is the current photometric calculation and measurement. And the foundation and basis of lighting design, the maximum value of V(λ) is at 555nm, and the luminous efficiency here is 683lm / W. The brightness of the light stimulus is below 0.01cd / m2, that is, in the case of dark adaptation, the rod cells mainly obtain vision, which is called scotopic vision. CIE also stipulated the scotopic efficiency function V'(λ), V' in 1951 The maximum value of (λ) is at 507nm, and the maximum luminous efficien...

AI Technical Summary

Problems solved by technology

Brightness is a value that is more concerned in the theory of mesovision, and it is also an important indicator in the lighting inspection of lighting sites. However, so far, there is no convenient and accurate intermediate measurement luminance meter.

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