Knight Optical’s UV Fused Silica Lenses for Flame Detection

16 Apr 2020

With an extensive range of UV Fused Silica Lens varieties within its wide-ranging portfolio, Knight Optical has a solution for every application. Due to its high transmission in the near-infrared (NIR) range (approximately <92% average 400-2000nm) – resulting in a clear distinction between different wavelengths – our UV Fused Silica Lenses are regularly specified for flame detection applications.

Moreover, UV Fused Silica, as a substrate, also has a very low coefficient of thermal expansion (0.55x10-6K-1 at 300K) when compared to N-BK7 (or equivalent) [7.1x10-6K-1], meaning that it can still provide optical performance under high temperature. Its high melting point, compared to N-BK7 (or equivalent), provides further protection for applications operating within high-temperature environments. In fact, UV Fused Silica is comparable to N-BK7 (or equivalent) substrates in terms of performance, having a very similar average transmission over the visible range up to approximately 2000nm and a slightly lower refractive index. Furthermore, the Abbe constants of UV Fused Silica are also very similar to that of N-BK7 (or equivalent), although marginally higher.

Here at Knight Optical, not only do we offer an extensive range of stock UV Fused Silica Lenses, but we also provide custom-made varieties for seamless integration with any device, regardless of size or requirements. This made-to-measure service allows you to specify the dimensions, substrates, tolerances and optical coatings – if required – that are best suited to your application.

Typical specs:

Material: UV Grade Fused Silica

Diameter tolerance: +0 / -0.10mm

Centring tolerance:

Focal length tolerance: ± 0.2mm (<10mm) ±2.0% (10mm – 1000mm)

Centre thickness tolerance: ±0.2mm

Surface figure: 3/ 3 (1)

Surface quality:

Coating: A range of ultraviolet (UV) and visible Anti-Reflective (AR) options available on request.

First-Class Quality

Quality is the driving force behind Knight Optical, and to ensure you profit from high-precision optics, we take the utmost care to ensure every component accurately meets your specifications. Offering unparalleled service, Knight Optical undertakes a full inspection of your optics from our ISO 9001:2015-certified, state-of-the-art Metrology Laboratory, followed by a meticulous visual examination by our dedicated QA department.

To discover how we can enhance your supply chain experience and to learn more about our stock and custom-made UV Grade Fused Silica Lenses, contact a member of our technical sales team today.

UK, Europe, Asia & RoW: E-mail info@knightoptical.co.uk

Tel +44 (0)1622 859444

USA & Canada: E-mail usasales@knightoptical.com

Tel +001 401-583-7846

View our QA and Metrology information