|
Off Topic Off Topic - General non-Corvette related discussion. |
|
Share | Thread Tools | Search this Thread |
02-21-2023, 3:04pm | #21 | ||||||
Barn Stall Owner #112
Join Date: Apr 2022
Location: The Blue Ridge Mountains
Posts: 17,042
Thanks: 6,747
Thanked 4,699 Times in 2,766 Posts
Gameroom Barn Bucks: $500
|
|
||||||
02-21-2023, 3:08pm | #22 | |||||||
Barn Stall Owner #55
Island14 Cardio Team
Join Date: Jan 2011
Location: A sympathetic, well-meaning, elderly man with a poor memory
Posts: 14,824
Thanks: 3,770
Thanked 9,234 Times in 4,393 Posts
Gameroom Barn Bucks: $23236
|
Quote:
Actually did some design work for IR cameras back in the day. First, the laser is just a pointer and has nothing to do with the sensor. IR energy is produced at wavelengths just below the visible spectrum (sorry, no discussion on quantum, so I'm sticking to waves). It can be focused with silicon lenses just like visible RF. The IR spectrum is actually divided into two somewhat distinct regions, near and far. We "feel" the near IR, which is closest to visible. There are some interesting things about far IR, but I won't digress. Your tool measures in the near IR range. Once focused through a lens, the energy impinges typically on a "thermopile". Why thermopile? It is literally a pile of thermocouples, similar to the bi-metal thermocouples that you have as a flame sensor in your NG HVAC. A pile is needed to amplify the small amount of IR energy into a useful signal. The energy is measured against a reference inside the unit in a thermally stable block. The delta-T creates electricity in proportion to the delta, and is measured by electronic circuitry and processed into the display as "absolute" temperature. As far as distance from target, the lens used has a field-of-view. If the target is smaller than the FOV, then the sensor is seeing area around the target along with the target. Good sensors actually publish the FOV in the form of "Distance to Spot" ratio. It specifies how far away from the target the sensor can be to obtain an accurate reading. If the D/S is 10, a 2" diameter object needs to be read at less than 20" (10:1 x 2). Your pizza stone probably easily fills the FOV of your sensor at 12". Shooting duct work from 15 or 20 feet becomes much more problematic. |
|||||||
02-21-2023, 3:14pm | #23 | ||||||
Chief Electrician
Barn Stall Owner #7734 Bantayan Kids '15
Join Date: Jan 2011
Location: The corner of Cease Rd. and Desist St.
Posts: 44,665
Thanks: 17,155
Thanked 33,844 Times in 13,713 Posts
Gameroom Barn Bucks: $107478
|
I have a black truck and have used it to measure the surface temperature on a hot summer day.
|
||||||
02-21-2023, 3:15pm | #24 | |||||||
Goldilocks
Barn Stall Owner #905 Bantayan Kids '13,'15
Join Date: Jan 2011
Location: My butt's been wiped.
Posts: 30,981
Thanks: 5,227
Thanked 16,607 Times in 7,133 Posts
Gameroom Barn Bucks: $1009320
|
Quote:
|
|||||||
02-21-2023, 3:16pm | #25 | |||||||
Barn Stall Owner #117
Join Date: Aug 2022
Location: An hour outside the swamp
Posts: 10,719
Thanks: 4,859
Thanked 11,219 Times in 4,117 Posts
Gameroom Barn Bucks: $500
|
Quote:
Thank you. |
|||||||
02-21-2023, 3:19pm | #26 | ||||||
A Real Barner
Join Date: Jun 2018
Posts: 7,626
Thanks: 1,977
Thanked 7,141 Times in 3,163 Posts
Gameroom Barn Bucks: $12721
|
|
||||||
02-21-2023, 3:30pm | #27 | ||||||
Goldilocks
Barn Stall Owner #905 Bantayan Kids '13,'15
Join Date: Jan 2011
Location: My butt's been wiped.
Posts: 30,981
Thanks: 5,227
Thanked 16,607 Times in 7,133 Posts
Gameroom Barn Bucks: $1009320
|
I never actually saw that being done but I've heard of it.
I've done some actual steam blows starting up boilers. All kinds of shit get's left inside pipe. Weld rod stubs, files, gloves, you name it. When they did the steam blow at Sherco 3 it was so loud the local cows stopped producing milk. Sherco 3 is a BIG MoFo coal fire. 900 MW. |
||||||
|
|
Support the Barn: |
Download the Mobile App; |
Follow us on Facebook: |
||