New apparatus for haze measurement for transparent media

Abstract

Precise measurement of luminous transmittance and haze of transparent media is increasingly important to the LCD industry. Currently there are at least three documentary standards for measuring transmission haze. Unfortunately, none of those standard methods by itself can obtain the precise values for the diffuse transmittance (DT), total transmittance (TT) and haze. This note presents a new apparatus capable of precisely measuring all three variables simultaneously. Compared with current structures, the proposed design contains one more compensatory port. For optimal design, the light trap absorbs the beam completely, light scattered by the instrument is zero and the interior surface of the integrating sphere, baffle, as well as the reflectance standard, are of equal characteristic. The accurate values of the TT, DT and haze can be obtained using the new apparatus. Even if the design is not optimal, the measurement errors of the new apparatus are smaller than those of other methods especially for high sphere reflectance. Therefore, the sphere can be made of a high reflectance material for the new apparatus to increase the signal-to-noise ratio.

Applicability of DIN 5036-3 to Transmittance Haze Measurement

“…Equation (3) shows that the sphere multipliers (as well as the effective reflectance inside the integrating sphere) could affect the accuracy of DT. In this simulative case, ρs was chosen as the variable.…”

“…Unfortunately, to date, various measurement methods still show inconsistency. In the first APMP TH pilot study (APMP.PR-P3), some commonly used methods in Asia-Pacific area were studied, including ASTM D1003, ISO14782, BS:2782 Part5, the double beam method [2], and the double compensation method [3]. Reasons causing inconsistent TH results were analyzed and discussed among NMIs [4].…”

A simple method for the fabrication of WO3 films with electrochromic and photocatalytic properties

“…10a. In order to assess whether the low transmittance of the devices is due to light scattering, we have estimated their transmission Haze number (H) in the bleached state, defined as the ratio of Diffuse to Total Transmittance (DT/TT%) following the ASTM test method D1003, described in [31]. The results appear in Fig.…”

A fast-switching light-writable and electric-erasable negative photoelectrochromic cell based on Prussian blue films

“…In the following part, we fix the thickness of PB film at the optimal value (452 nm). Following the standard test method of ASTM D1003A [32,15], the haze numbers of the cell at bleached state were investigated and shown in Fig. S3.…”