Toward a quantitative model for suspended particle devices: Optical scattering and absorption coefficients

Abstract

Suspended particle devices (SPDs) allow rapid voltage-controlled modulation of their optical transmit-tance and are of interest for solar-energy-related and other applications. We investigated the spectral total and diffuse transmittance of an SPD, including its angular dependence. The optical modulation was large for visible light but almost nil in the infrared, and the devices had noticeable haze. A theoretical two-flux model was formulated and provided a quantitative description of the absorption and scattering coefficients and thereby of the detailed optical performance. This analysis gives a benchmark for assessing improvements of the SPD technology as well as for comparing it with alternative technologies for optical modulation.

Thermochromic VO2 nanorods made by sputter deposition: Growth conditions and optical modeling

“…The diffuse components represent light that was not specularly reflected or transmitted through the sample, as elaborated elsewhere. 136 Our reflectance standard was a plate coated with BaSO 4 . Figure 7 shows T(λ) and R(λ) for samples 1, 2, 7 and 9.…”

Durability of switching behaviour after outdoor exposure for a suspended particle device switchable glazing

“…LC glazing at opaque state scatters the light, become haze, and provides no control of NIR [31]. SPD glazing can control only the visible solar spectrum and transmit IR spectrum [32].…”

Interior colour rendering of daylight transmitted through a suspended particle device switchable glazing

“…Suspended particle device (SPD) glazing is a form of switchable adaptive glazing in which a plastic film sandwiched between two glass panes contains suspended dihydrocinchonidine bisulfite polyiodide or heraphathite SPD particles [11][12][13]. The particles may be needle-shaped, rod-shaped, or lath-shaped.…”