Prism Design to Filter Out Infrared Light

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Discussion Overview

The discussion centers around the feasibility of using a prism to filter out infrared (IR) light, particularly in the context of enhancing the efficiency of solar panels. Participants explore various methods, materials, and mathematical considerations related to this topic.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants question whether a prism can effectively filter out IR light and seek clarification on the mathematical principles involved.
  • One participant suggests that there may not be significant math involved, proposing to block wavelengths outside the visible spectrum without considering the efficiency of solar cells with respect to IR light.
  • Another participant emphasizes the importance of selecting the right prism material based on the wavelengths that solar cells respond to and the transmission characteristics of the prism material.
  • Concerns are raised about the potential overheating of solar panels due to IR absorption, leading to a recommendation to consider materials that do not transmit IR.
  • Some participants argue against using prisms altogether, suggesting that spectral filters would be a simpler and more effective solution.
  • It is noted that many glasses are not transparent below 2 microns, which could inherently limit the effectiveness of prisms as IR filters.

Areas of Agreement / Disagreement

Participants express differing opinions on the effectiveness of prisms versus spectral filters for IR light filtration. There is no consensus on the best approach, and the discussion remains unresolved regarding the optimal method for filtering IR light in solar panel applications.

Contextual Notes

Participants highlight the need for careful consideration of the specific wavelengths involved and the characteristics of the materials used, indicating that assumptions about the effectiveness of prisms may depend on these factors.

Yachtsman
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Is it possible to filter out infrared light using a prism, and if so, how? What is the math involved to do this?

I want to come up with some effective, durable ways to filter out IR light for solar panels, to keep their temperature lower to make them more efficient.
 
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Yachtsman said:
Is it possible to filter out infrared light using a prism, and if so, how? What is the math involved to do this?

I want to come up with some effective, durable ways to filter out IR light for solar panels, to keep their temperature lower to make them more efficient.

I'm not sure there's any math involved at all. Just look at where the visible light ends and block off everything on either side of it. I'd lookup which frequencies your cell is the most efficient at first, though. It might like the IR light.
 
You must choose the prism material carefully by researching the following:
1) What are the wavelenghts that the solar cells respond most stronly to.
2) What are the wavelengths transmitted by the prism material?
3) How much of the required light is absorbd by by your prism material?**
4) If IR is not beneficial to the power produced, try to chose a material that does not transmit IR.
I presume you are worried about the panels overheating from the IR absorption.

If I were doing this, I would skip the prisms (added cost and weight) and just go with an IR filter.
 
A prism is not ideal because the angle of incidence and the position at which the light strikes the prism is inherently variable. This results in a plethora of spectra superimposed on one another which largely prohibits spatial filtering.

I agree with daqddyo1; a spectral filter is by far a simpler solution here.

Also, keep in mind that most glasses are not transparent below a wavelength of 2 microns in any case, so any prism would effectively act as an IR filter anyway.

Claude.
 

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