Multilayer coatings on glass for painting protection and optimized color rendering

Angela Piegari; Pietro Polato

doi:10.1364/AO.41.003319

Applied Optics
Vol. 41,
Issue 16,
pp. 3319-3326
(2002)
•https://doi.org/10.1364/AO.41.003319

Multilayer coatings on glass for painting protection and optimized color rendering

Angela Piegari and Pietro Polato

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Angela Piegari and Pietro Polato, "Multilayer coatings on glass for painting protection and optimized color rendering," Appl. Opt. 41, 3319-3326 (2002)

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Abstract

Optical coatings offer a solution to the problem of damage to paintings, caused by ultraviolet and infrared radiation, by cutting radiation wavelengths outside the visible range. Simultaneously, these coatings can enhance an observer’s viewing of the paintings by reducing the reflections from ordinary glass panes. All these functions should be performed by the same coating. The design of such a coating, as well as the evaluation of existing products, requires the definition of an appropriate merit function in which coating absorption, high transparency, and color rendering are combined.

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Uncoated	Coated
1—Clear float (4 mm)	6—Antireflection (3 layers of SiO₂–TiO₂ on each side)
2—Standard float (4 mm)	7—Low emissivity (2 layers of SnO₂:F–SiO₂)
3—Light green float (4 mm)	8—High-reflecting 1 (metal oxide–metal)
4—Laminated A (3 mm × 0.38 mm × 3 mm)	9—High-reflecting 2 (metal oxide–metal)
5—Laminated B (4 mm × 0.38 mm × 4 mm)	10—Solar cooling (mixed metal oxides)

Parameter	Symbol	Formula	Ideal Value
UV transmittance	τ_UV	$\frac{\sum_{λ = 300 nm}^{380 nm} τ (λ) S_{λ} Δ λ}{\sum_{λ = 300 nm}^{380 nm} S_{λ} Δ λ}$	0
Damage factor	τ_df	$\frac{\sum_{λ = 300 nm}^{500 nm} τ (λ) {KDF}_{λ} S_{λ} Δ λ}{\sum_{λ = 300 nm}^{500 nm} {KDF}_{λ} S_{λ} Δ λ}$	0 (up to 410 nm)
Light transmittance	τ_V	$\frac{\sum_{λ = 380 nm}^{780 nm} τ (λ) D_{λ} V (λ) Δ λ}{\sum_{λ = 380 nm}^{780 nm} D_{λ} V (λ) Δ λ}$	100% (from 410 to 690 nmb)
Light reflectance	ρ_V	$\frac{\sum_{λ = 380 nm}^{780 nm} ρ (λ) D_{λ} V (λ) Δ λ}{\sum_{λ = 380 nm}^{780 nm} D_{λ} V (λ) Δ λ}$	0
NIR transmittance	τ_NIR	$\frac{\sum_{λ = 780 nm}^{2500 nm} τ (λ) S_{λ} Δ λ}{\sum_{λ = 780 nm}^{2500 nm} S_{λ} Δ λ}$	0 (from 690 nm)
Breckenridge and Schaub abscissa	x″	see the text	0
Breckenridge and Schaub ordinate	y″	see the text	0
View-through index	I_VT	see the text	100%

Parameter	Plastic Sheet	Low-Emissivity Coated Glass
τ_df	4.8%	14.0%
τ_V	77.3%	73.7%
ρ_V	9.8%	4.7%
τ_NIR	89.0%	9.3%
x′	0.00124	0.00277
y′	-0.00119	0.00566
I _VT	76.6%a	63.3%a

Uncoated	Coated
1—Clear float (4 mm)	6—Antireflection (3 layers of SiO₂–TiO₂ on each side)
2—Standard float (4 mm)	7—Low emissivity (2 layers of SnO₂:F–SiO₂)
3—Light green float (4 mm)	8—High-reflecting 1 (metal oxide–metal)
4—Laminated A (3 mm × 0.38 mm × 3 mm)	9—High-reflecting 2 (metal oxide–metal)
5—Laminated B (4 mm × 0.38 mm × 4 mm)	10—Solar cooling (mixed metal oxides)

Parameter	Symbol	Formula	Ideal Value
UV transmittance	τ_UV	$\frac{\sum_{λ = 300 nm}^{380 nm} τ (λ) S_{λ} Δ λ}{\sum_{λ = 300 nm}^{380 nm} S_{λ} Δ λ}$	0
Damage factor	τ_df	$\frac{\sum_{λ = 300 nm}^{500 nm} τ (λ) {KDF}_{λ} S_{λ} Δ λ}{\sum_{λ = 300 nm}^{500 nm} {KDF}_{λ} S_{λ} Δ λ}$	0 (up to 410 nm)
Light transmittance	τ_V	$\frac{\sum_{λ = 380 nm}^{780 nm} τ (λ) D_{λ} V (λ) Δ λ}{\sum_{λ = 380 nm}^{780 nm} D_{λ} V (λ) Δ λ}$	100% (from 410 to 690 nmb)
Light reflectance	ρ_V	$\frac{\sum_{λ = 380 nm}^{780 nm} ρ (λ) D_{λ} V (λ) Δ λ}{\sum_{λ = 380 nm}^{780 nm} D_{λ} V (λ) Δ λ}$	0
NIR transmittance	τ_NIR	$\frac{\sum_{λ = 780 nm}^{2500 nm} τ (λ) S_{λ} Δ λ}{\sum_{λ = 780 nm}^{2500 nm} S_{λ} Δ λ}$	0 (from 690 nm)
Breckenridge and Schaub abscissa	x″	see the text	0
Breckenridge and Schaub ordinate	y″	see the text	0
View-through index	I_VT	see the text	100%

Abstract

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Figures (8)

Tables (3)

Equations (3)

Applied Optics