CBSE Class 11-science Answered
Kirchoff's law- Optical Pyrometer
Asked by | 14 Apr, 2008, 12:37: PM
Expert Answer
- It just means that the body will acquire the temperature of the enclosure.
- Optical Pyrometers work on the basic principle of using the human eye to match the brightness of the hot object to the brightness of a calibrated lamp filament inside the instrument. The optical system contains filters that restrict the wavelength-sensitivity of the devices to a narrow wavelength band around 0.65 to 0.66 micons (the red region of the visible spectrum).
- Other filters reduce the intensity so that one instrument can have a relatively wide temperature range capability. Needless to say, by restricting the wavelength response of the device to the red region of the visible, it can only be used to measure objects that are hot enough to be incandescent, or glowing. This limits the lower end of the temperature measurement range of these devices to about 700 °C.Some experimental devices have been built using light amplifiers to extend the range downwards, but the devices become quite cumbersome, fragile and expensive.
Answered by | 15 Apr, 2008, 07:50: PM
Concept Videos
CBSE 11-science - Physics
Asked by rajuinwati12 | 04 Mar, 2024, 09:22: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by joelisaacsam | 09 Jan, 2024, 06:31: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by rupimadhes | 21 Nov, 2023, 05:31: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by arjunsah797 | 12 Mar, 2022, 11:10: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by suragimathpraveen2001 | 10 Jan, 2022, 08:06: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by raghuvanshisaumya461 | 03 Dec, 2021, 08:05: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by abhinavakrishna1009 | 31 Mar, 2021, 11:15: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by vanshraaj.ind | 13 Dec, 2020, 06:06: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by ashanihalchandani | 26 May, 2020, 09:11: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by mahimanaik290 | 10 May, 2020, 12:45: AM
ANSWERED BY EXPERT