• Title/Summary/Keyword: total luminous transmittance

Search Result 4, Processing Time 0.019 seconds

Evaluation of Blue-light Blocking Ratio and Luminous Transmittance of Blue-light Blocking Lens based on International Standard (국제표준에 의거한 청색광차단렌즈의 청색광차단율 및 시감투과율 평가)

  • Kim, Chang-Jin;Choi, Sung Wook;Yang, Seok Jun;Oh, Sang-Young;Choi, Eun Jung
    • Journal of Korean Ophthalmic Optics Society
    • /
    • v.19 no.2
    • /
    • pp.135-143
    • /
    • 2014
  • Purpose: To evaluate the blue-light blocking ratio and luminous transmittance of blue-light blocking lenses using the blue-light hazard function as specified in international standard. Methods: In order to calculate the blue-light blocking ratio and luminous transmittance for a total of 41 blue-light blocking lenses from 8 manufacturers, UV-Vis spectrophotometer was used for measuring the spectral transmittance of wavelengths from 380 to 780 nm. Blue-light blocking ratio was calculated using blue-light hazard function as specified in ANSI Z80.3:2010 and ISO 13666(or Korean Standard KS B ISO 13666:2004). Results: The range of the blue-light blocking ratio was from 9.3 to 96.8%, the range of the transmittance from 53.5 to 92.7%, and the range of the luminous transmittance from 58.0% to 98.1%. In general the blue-light blocking lens prepared by coating tended to have a higher luminous transmittance, while those prepared by tinting a higher blue-light blocking ratio. Conclusions: The behavior of the spectral distribution of lenses showed the possibility of the performance improvement in the blue-light blocking lenses. Manufactures need to acquire their own technology that can evaluate the performance of blue-light blocking lens based in international standard.

Empirical Fitting Curve for Luminous Transmittance in Tinted Lenses Using Superposition of Exponential Decay Curves (지수감소곡선의 중첩을 이용한 착색렌즈 시감투과율의 실험적 맞춤곡선)

  • Choi, Eun Jung;Lee, Sin Ui;Lee, Eun Jin;Yoon, Moon Joo;Jeong, Ji-Hyeon;Kim, Chang-Jin;Yang, Gye Tak;Jeong, Ju-Hyun;Kim, Hyun Jung
    • Journal of Korean Ophthalmic Optics Society
    • /
    • v.16 no.3
    • /
    • pp.283-291
    • /
    • 2011
  • Purpose: To find an empirical fitting curve to represent the relationship between the luminous transmittance and tinted time in tinted lenses using exponential decay curves. Methods: Total ninety tinted lenses were prepared with CR-39 lenses and six different colored dyes. Single, double and triple exponential decay curves were used as trial curves in order to find the empirical fitting curve. Result: The results showed that the best empirical fitting curve was triple exponential decay curves. Conclusions: We propose triple exponential decay curves as proper empirical fitting curves to represent the tinted-time dependence of the luminous transmittance in tinted lenses.

Investigating the Antibacterial Qualities of Copper Particle-Infused UV-Curable Paint for Wood Flooring Boards (구리입자 기반 UV경화도료 코팅 목질 마루판의 항균 특성)

  • Lee, Dong-Gun;Lim, Nam-Gi;Koh, Jae-Song
    • Journal of the Korea Institute of Building Construction
    • /
    • v.23 no.4
    • /
    • pp.393-404
    • /
    • 2023
  • This research evaluates the antibacterial and transparency properties of UV-curable paint augmented with 20wt% copper particles. The transparency assessment indicated that the paint maintained a total luminous transmittance of 90% or above, thereby matching or surpassing the performance of standard UV-curing paints. To further test its antibacterial capabilities, wooden flooring boards were coated with the UV-curable paint laced with 20wt% copper particles, which had been surface-modified with a silane coupling agent. Following the fatigue tests of these treated boards, an impressive bacterial reduction rate of 99.9% was noted after a span of 6 hours, demonstrating the paint's exceptional antibacterial performance.

SI-traceable Calibration of a Transmissometer for Meteorological Optical Range (MOR) Observation (기상관측용 투과형 시정계의 국제단위계에 소급하는 교정)

  • Park, Seongchong;Lee, Dong-Hoon;Kim, Yong-Gyoo
    • Korean Journal of Optics and Photonics
    • /
    • v.26 no.2
    • /
    • pp.73-82
    • /
    • 2015
  • This work demonstrates the indoor SI-traceable calibration of a transmissometer with a 75-m baseline for the measurement of visibility in MOR (Meteorological Optical Range). The calibration is performed using a set of neutral density (ND) filters (OD 0.1-2.5) and a set of high-transmission quartz glass plates (a bare quartz glass plate and antireflective-coated quartz glass plates), the collection consisting of 20 artifacts in total. The luminous transmittance values of the reference artifacts had been calibrated traceable to the KRISS spectral transmittance scale, which ranges from 0.2 % to 99.5 %. The transmissometer to be calibrated typically consists of a loosely collimated light source based on a white LED (CCT ~5000 K) and a luminous intensity detector with a CIE 1924 V(${\lambda}$) spectral response. As a result of calibration, we obtained the MOR error and its uncertainty for the transmissometer in 20 m - 40 km of MOR. Based on the results, we investigated the applicability of the calibration method and the conformity of the transmissometer to the ICAO's (International Civil Aviation Organization) accuracy requirement for meteorological visibility measurement. We expect that this work will establish the standard procedure for the SI-traceable calibration of a transmissometer.