건물창의 빛투과율을 시험하는데 사용되며, 다양한 재질의 창문을 만드는 데 적합합니다. 채광창 상부와 발코니 도어의 투과율 및 색 투과율을 포함하며, 유리 커튼월의 투과율 및 색 투과율을 동시에 감지할 수 있습니다.

1. standard of execution
GB/T 11976-2015 외부 창문의 일광 특성 등급 및 테스트 방법.

2. Main technical parameters
Test items: transmittance T and color transmittance R.
The testing device consists of light source room, light source, receiving room, specimen frame and testing instrument.

Light room:
The inner surface is diffusely reflected with low spectral selectivity and a reflection ratio greater than 0.8
The illuminance on the surface of the specimen is greater than 1000lx, and the illuminance difference at each point is less than 1%
The light source room shall be rectangular, with the opening area less than 10% of the indoor surface area

light source：
Electric light source with continuous spectrum, symmetrical arrangement and light control device are adopted
The light source is powered by a stabilized voltage source, and its voltage fluctuation is no more than 0.5%
The stability of the light source was checked according to the method described in appendix 1 of jjg247-1994
The light source is specially designed to ensure that no direct light falls on the surface of the specimen

Reception room：
The inner surface is diffusely reflected with low spectral selectivity and a reflection ratio greater than 0.8
The receiving chamber is a cube, and the opening area is less than 10% of the indoor surface area

Specimen box：
The thickness of the specimen frame is equal to the actual wall thickness
The connection part between the specimen frame and the two-chamber opening is strictly sealed to ensure no light leakage

Optical receiver:
The optical receiver shall have a V() correction whose spectral response is consistent with the illumination efficiency of the international illumination commission's light vision spectrum
The optical receiver has a cosine corrector, and the optical receiver meets the requirements of the first-level illuminometer specified by JJG245
The optical receiver is uniformly arranged on the periphery and inner side of the opening of the receiving chamber, and the quantity is set according to the size