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BirefringentStress
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- TL;DR Summary
- Glass Photonics {subsidiary of stress photonics} is one example of a company that uses reflective photoelasticity for stress analysis systems, however how does reflective photoelasticity work on transparent materials such as glass, if light transmits through it and does not bounce off it?
https://glassphotonics.com/all-products/grey-field-polariscopes/gfp2600-product-line/
In this link you can see a photoelasticity instrument that is all-in-one, and compact. Traditional photoelasticity (left hand side, (a), in this picture) is not compact and has an awkward apparatus setup where there are polarising filters in front of the subject specimen , and polarising filters behind the subject specimen. This makes sense for glass, as light transmits through glass and therefore you would need an analyzer and camera/sensor to detect the polarized light that passed through the transparent specimen. But this product is not a traditional photoelasticity apparatus, its like a standalone camera with an integrated polariscope that you can point at glass and suddenly get stress analysis information!
The reason the website says this photoelasticity apparatus is so compact and works is because it uses kaleidoscope optics. (as stated on the product description in the glassphotonics website: " kaleidoscopic optics")
But I don't understand what that is!! And I've tried a literature review and gotten nowhere. Look at fig 1 of this paper if you want a schematic of a kaleidoscope integrated with a polariscope
Is it like reflective photoelasticity? (right hand side (b), in the previous picture). Even then, how are they getting light to reflect off glass, glass is transparent so why would light be reflected?
And if light is transmitted through and there is nothing to receive the transmitted light through the other side of the transparent glass, how are they receiving any polarized light that's been through the glass??
There is this paper published by stress photonics talking about how they used reflective photoelasticity to analyse stress in a car windshield, but they applied a reflective coating/substance in the inner surface of the glass to allow reflection of light. My question is how does the advertised product (the GFP-2600) work, that definitely does not use reflective coatings or require it, because you can see they use the apparatus on float glass freshly manufactured and being transported on rolling pins in the factory fresh from annealing. It is used as in-situ real time stress monitoring. So there is no shot of a reflective coating applied to the float glass there, because it's freshly produced right and why would they ruin the glass with an opaque reflective coating that is constantly spraying float glass?
I'm so confused, I may be very wrong as I am just a layman. Please someone help me out! Or point me in the right direction, I have tried contacting the company themselves but they have ignored me.
In this link you can see a photoelasticity instrument that is all-in-one, and compact. Traditional photoelasticity (left hand side, (a), in this picture) is not compact and has an awkward apparatus setup where there are polarising filters in front of the subject specimen , and polarising filters behind the subject specimen. This makes sense for glass, as light transmits through glass and therefore you would need an analyzer and camera/sensor to detect the polarized light that passed through the transparent specimen. But this product is not a traditional photoelasticity apparatus, its like a standalone camera with an integrated polariscope that you can point at glass and suddenly get stress analysis information!
The reason the website says this photoelasticity apparatus is so compact and works is because it uses kaleidoscope optics. (as stated on the product description in the glassphotonics website: " kaleidoscopic optics")
But I don't understand what that is!! And I've tried a literature review and gotten nowhere. Look at fig 1 of this paper if you want a schematic of a kaleidoscope integrated with a polariscope
Is it like reflective photoelasticity? (right hand side (b), in the previous picture). Even then, how are they getting light to reflect off glass, glass is transparent so why would light be reflected?
And if light is transmitted through and there is nothing to receive the transmitted light through the other side of the transparent glass, how are they receiving any polarized light that's been through the glass??
There is this paper published by stress photonics talking about how they used reflective photoelasticity to analyse stress in a car windshield, but they applied a reflective coating/substance in the inner surface of the glass to allow reflection of light. My question is how does the advertised product (the GFP-2600) work, that definitely does not use reflective coatings or require it, because you can see they use the apparatus on float glass freshly manufactured and being transported on rolling pins in the factory fresh from annealing. It is used as in-situ real time stress monitoring. So there is no shot of a reflective coating applied to the float glass there, because it's freshly produced right and why would they ruin the glass with an opaque reflective coating that is constantly spraying float glass?
I'm so confused, I may be very wrong as I am just a layman. Please someone help me out! Or point me in the right direction, I have tried contacting the company themselves but they have ignored me.