What do you actually need to look at ?
the only off the shelf unit to suit our application is worth $125,000, from memory this one will handle 1500 degrees.
I did find a unit overseas that can handle 300 degrees for a short period of time, 200 degrees for longer time
Problem is I need one to handle 850 degrees for maybe 10sec max.
Sooo DIY it is…….what my chances of success.??
I am aware of a company in the west that uses go-pro’s is a custom made insulated box, they have worked out max time it can be in the environment so they can still read the SD card . The go pro is single use, as it’s destroyed in the process of taking the videos.
I’ll plough ahead to a bore scope……..as we want to see what it’s looking at in real time. I have a few ideas up my sleeve…..
Be interested in members thoughts on how they would approach this build!!!!!
What do you actually need to look at ?
Our car: Fuji White MY13 D4 SDV6 SE 3.0 Litre, 8 spd auto.
My car: Series 2a Workshop, 109 inch WB, ex mil., 1971. To be restored.
Wife's car: Series 2a FFT, LWB, ex. mil., 1966. To be restored.
And how big is the hole?
My initial gut idea was something like a conventional borescope inside a stainless tube with a quartz window and some dense insulation like fibreglass between the borescope and the stainless wall. Trying to use the thermal inertia and poor conductivity of the stainless coupled with the insulation to keep the actual borescope cooler.
Kinda like a thick insulating condom.
10 seconds isn't a lot of time, you'd need to make sure the thermal inertia in the thermocouple was small enough to get an accurate reading.
The other thing I thought was using a big enough bit of tube, space the borescope internally with a spider and run a small pipe down the inside to push compressed air into the lens end of the tube to help carry the heat back up the tube.
Interesting project. I have a small hobby waste oil furnace, so always interested in furnace stuff.
Sapphire lens higher melt temp. I got several 3 inch dia by 1 inch thick, used, from USA for a few hundred - a nice big window - if you're customising then diamond tooling required (lapidary saw and laps/grinders). Someone will sell something ready made for your size requirements more expense. You melting aluminium? Wonder if there could be a flux effect on sapphire, aluminium oxide? Note I'm not using my sapphire for furnace related matters.
Iced water jacket/coils like convection furnace.
How close have you got to get to the site of interest. Remote port hole with telescopic camera lense set up?
Was involved years ago with building a borescope that could survive insertion into a blast furnace ~2000C +.
Inconel 600 series alloy tube, think we had a sapphire window, optic fibre and **** loads of water cooling. Worked fine till someone forgot to turn the water cooling on one day.
2011 D4 3.0 SDV6
1999 D2 V8, in heaven
1984 RRC, in hell
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