I need an optical fiber which I could use for a sensor operating in a temperature of approx. 800 *C.
I know that sapphire fiber can operate in this range and some rumors on other helpful fibers, but don't know prices, and haven't got recommended provider.
Could anybody help?
For high temperature applications, you can use regenerated gratings. Regenerated gratings can be used as a temperature sensor at a very high temperature.
Thank you Ajay. Of course, your suggestion is ok, nevertheless the development of the sensor is going to be a part of other research which is aimed at inscription the gratings on special fibers with the use of a femtosecond laser, so that's why I need data on high-temp resistant fibers.
Hi Pawel. Are you after just the optical fibre or the sensor as well? Silica fibres alone can be OK up to quite high temperatures (say ~1000degC max), it is usually the protective coatings that cause problems. Acrylate coatings are no good at high temps but there are other coatings that are OK, such as metal coatings (e.g. aluminium). As Ajay said regenerated Bragg gratings can work as sensors at high temperatures and rare-earth-doped fibre fluorescence (FIR or lifetime) sensors can work at these temperatures as well.
@Scott - thx for info - I'm rather thinking about a (special) fiber than on the sensor.
One of goals is to demonstrate the capability to write FBGs with the use of our new femtosecond laser. So - also it would be great if it could be written on something considered "a difficult fiber for the inscription of gratings" and if it could be applied in an interesting temp. sensor.
@Maria - the high temperature here is is at least 800 *C and it would be even better if it still worked for, say, 1200 *C.
hey this spin out company might interest you : http://www.oxsensis.com/product/optical-sensors-overview
Hi Pawel. For high temperature fiber optic sensors, you can use FBG fiber with metal coated as Scott said or LPG and also SLD as a source
Hi Pawel, you can download the paper."Comparison between PI coated FBG and agarose coated LPG for measuring sugar and salt concentration" from IEEE explorer.
You may consider High Power Fiber Optic Components of Oz Optics: http://www.ozoptics.com/products/highpower.html
Hi Pawel,
As you know sapphire appears to be highly suitable for temperatures 1000C and higher. Regarding costs for the length of fiber you need you can try the link below:
http://www.lasercomponents.com/uk/product/sapphire-fibers/
Thangam Parameswaran
Sapphire fiber with femtosecond laser drawn Bragg gratings (Type-II) can be used for your application (800-1200oC).
The stability of the regenerated fiber Bragg grating for high temperature applications is not yet proven. We have developed a high temperature sensor (up to 1100 C) based on Fabry-Perot cavity, please see the paper link below. http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7036038
Sapphire fiber can be operated above this temperature.
For high temperature applications, you can use productions from this site:
http://www.chiralphotonics.com/Web/1000ctempsensor.html
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