Measuring Temperature Gradients with High Temperature Sapphire L - Fibres

06 Sep 2017

LASER COMPONENTS offers L-fibres from Photran LLC for measuring temperature

gradients. These single crystal sapphire optical fibres have broad transmission, from

the UV to about 3.5um in the infrared, and their melting point is 2040 C.

Sapphire fibres are used for pyrometry in high temperature systems such as turbine

and internal combustion engines. While sapphire fibres are flexible, Photran has

recently been supplying sapphire fibres having a permanent bend in them, typically a

right angle, so they are often called L - Fibres. By attaching several fibres along the

wall of a furnace or chamber, with the ends bent inwards to collect light from different

points, the thermal gradient in the system can be measured. Because sapphire is

nearly chemically inert and has such a high melting point it can be used in very

reactive and hot environments.

Usually, three or more fibres are built into a furnace or system such that they collect

light from different locations. The fibres are usually 425um diameter, with a 90

degree bend, but can be custom designed by changing the bend angle and lengths.

Sapphire fibres are also widely used for transmitting laser radiation for medical and

dental systems at the popular Er:YAG 2.94um wavelength as well as very high power

Nd:YAG beams at 1.064um. LASER COMPONENTS can supply fibres for these

applications with the option of a PFTE buffer and SMA optical connectors.

More Information https://www.lasercomponents.com/uk/product/sapphire-fibers/