Measuring Lightbulb Temperature: Spectroscopy and Thermocouples

  • Thread starter Thread starter raging_hippo
  • Start date Start date
AI Thread Summary
To accurately measure the temperature of a lightbulb, two methods are suggested: spectroscopy for the filament and thermocouples for the bulb surface. For the filament, capturing a spectrum and fitting it to the blackbody equation is recommended, with adjustments for the bulb material if possible. For the bulb surface, using a small thermocouple attached with thermally conductive grease is advised, and testing different grease spot sizes can help assess measurement accuracy. It's important to analyze the impact of grease size on readings and adjust calculations accordingly. These methods aim to enhance the precision of temperature measurements as electrical power is increased.
raging_hippo
Messages
5
Reaction score
0
What would be the best way to go about measuring the temperature of a Lightbulb? I've been set a task to measure the temperature of a lightbulb as i increase the electrical power supplied to it and i was just wondering what would be the most practical way to do it.

Any help would be greatly appreciated :biggrin:
 
Physics news on Phys.org
I've already tried doing it that way but its not really accurate enough. Any other ideas?
 
Do you want the temperature of the filament, or the surface?

For the filament, do it spectroscopically. Take a spectrum and fit it to the blackbody eqation. If possible, make an estimate to correct for the material of the bulb.

For the bulb, use the smallest thermocouple you can find. Contact the thermocouple to the bulb with thermally conductive grease. Make several contacts of varying size to see if the size of the grease spot makes a difference. If it does, try to determine the effect and eliminate it mathematically.

Njorl
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Sensitivity of a thermocouple from thermometric function
Replies
1
Views
2K
Experimenting whether the diameter of a pot affects boiling time for water
Replies
15
Views
2K
Lightbulb connected to the battery circuit helo
Replies
16
Views
7K
Measuring Temperature of PCB Via
Replies
30
Views
3K
Calculating controller gain in a feedback loop
Replies
14
Views
2K
Calculating the resistance in a compensating circuit for a thermocouple
Replies
8
Views
2K
Environmental Physics - Radiative forcing effect on greenhouse effect
Replies
1
Views
1K
What Is the Correct Internal Temperature of a Sealed Box with a Lightbulb?
Replies
3
Views
9K
Interpreting electrochemical impedance spectroscopy (EIS) circuits
Replies
5
Views
2K
Measurements Calculation Problem
Replies
3
Views
888

Hot Threads

Recent Insights

Back
Top