What materials can be used in photonic crystal fiber sensors to withstand and measure high temperatures? (more than 100 degree centigrade)
Fotonik kristal fiber sensörler çelik sektöründe kullanılabilir. Yapısında %2.5 fazla Fe, Ni, Co vb. Elementler, bileşikler ve alaşımlar çelik üretiminde kullanılabilir. Kristal elyafların yapısı oldukça güçlü ve seallerden oluşur. Bu seallerin yapısında çelikten daha güçlü esnek elyaflar bulunur. Fotonlar ise doğada saf halde bulunur ve oldukça kararlı bir yapıda bulunur. Seallerin doğal oluşumuna bakılacak olursa doğadaki fotonlarla birleşirse oldukça güçlü fotonik kristal elyaflar oluşturulabilir.
Hi dear Şükrü Aktaş
Thanks for your response, but I think you misunderstood my question. I am looking for some materials which can withstand high temperatures. I need them to design and simulate a "photonic crystal fiber sensor" used in the steel industry.
Around 100°C, classic silica optical fibers can still be used ; it's probably the coating that you will need to be careful about. I used to work with silica fibers with a polymide coating designed to work up to 250°C, but they can go even higher. If you go above several hundreds °C or 1000°C, maybe will you need an other material for the fiber, such as sapphire, which is used for very high temperature applications.
Hi dear Antoine Brientin
Thanks for your response
According to your guidance, I searched on the web and found some helpful structures using Sapphire. They can measure high temperatures but their structures are totally different compared to my sensor design. I need a structure similar to my current design (a solid-core silica fiber with 3 rings of holes in which a thermo-sensitive liquid is injected into the second ring).
Do you know any structure like this which can measure high temperatures?
I have not directly worked with sapphire fibers, but as far I know, they are quite expensive and often custom made. I don't know what kind of temperature you had in mind, but if it's around 100°C like you said before, I think it would be easier to work with silica PCF.
If you are looking for sapphire PCF, I'm not sure you can find them off-the-shelf like any other components. If you have acess to micro-machining capabilities, maybe you can remove part of the core at the fiber tip to create a Fabry-Pérot cavity at the end. Or maybe create some holes in which you can put your liquid.
Maybe the references below can be useful ?
https://ieeexplore.ieee.org/abstract/document/9201161
https://www.spiedigitallibrary.org/journals/optical-engineering/volume-49/issue-9/090501/Sapphire-photonic-crystal-fibers/10.1117/1.3483908.full
https://ieeexplore.ieee.org/abstract/document/7471527
https://www.sciencedirect.com/science/article/abs/pii/S0143816615002614?via%3Dihub
Thank you my friend Antoine Brientin
Your links are very helpful.
In fact, I am searching for a PCF sensor that can measure the temperatures between 800-1000 °C, not 100.
In that case, 1000°C is a temperature where sapphire may be more suitable than silica, especially if mechanical stress and long duration exposure to this temperature are expected.
Still, I would not completely rule out silica fibers (see link below for example): if you remove the polymer coating and keep only the glass part, maybe it can work for a limited time. I guess it will really depends on your requirements for the sensor.
https://www.osti.gov/servlets/purl/1489125
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