Could Interference be used to effect one way radiation?

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    Interference Radiation
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Discussion Overview

The discussion centers on the possibility of using interference patterns created by radiation from two black body sources to affect the radiation received by a third black body sphere. Participants explore the nature of black body radiation and its implications for interference effects.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant proposes that radiation from two black body sources at the same temperature could create a maximum-minimum interference pattern that would affect the radiation received by a third black body sphere.
  • Another participant argues that black body radiation is not coherent, thus suggesting that interference patterns would not form in a meaningful way.
  • A further elaboration states that black body radiation consists of random phase radiation across a broad frequency spectrum, which negates the possibility of interference effects in a uniform temperature environment.
  • It is noted that the concept of thermodynamic equilibrium is crucial, as any inserted body would experience the same random radiation spectrum regardless of its position relative to the two sources.

Areas of Agreement / Disagreement

Participants express disagreement regarding the feasibility of interference effects in the context of black body radiation, with some asserting that such effects cannot occur due to the incoherent nature of the radiation.

Contextual Notes

Participants highlight the importance of temperature equilibrium and the random nature of black body radiation, which may limit the applicability of interference concepts in this scenario.

philrainey
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If you have radiation from two black body sources at same temperature will they make a maximin minimum Interference pattern that another small black body sphere can be inserted in, in a minimum space. Will they radiate low radiation to the sphere (Due to the radiation energy in that area been low due to Interference) But the radiation to the two sources be a higher energy value?
http://en.wikipedia.org/wiki/Interference_(wave_propagation)
 
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If you have radiation from two black body sources at same temperature will they make a maximin minimum Interference pattern
No, the blackbody radiation from the two sources is not coherent.
 
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Just to elaborate somewhat on #2. A black-body emits random phase radiation over a very broad frequency spectrum (Planck spectrum). Interference is entirely absent in any meaningful sense. To quote from the very first part of Wiki article http://en.wikipedia.org/wiki/Black-body_radiation

"Black-body radiation is the type of electromagnetic radiation within or surrounding a body in thermodynamic equilibrium with its environment, or emitted by a black body (an opaque and non-reflective body) held at constant, uniform temperature. The radiation has a specific spectrum and intensity that depends only on the temperature of the body.[1][2][3][4]."

'thermodynamic equilibrium' is the operative expression here. Any inserted third body feels the same random radiation spectrum regardless of location relative to the other two - if in a uniform temperature environment. Which of course would not apply if the first two black bodies are internally heated to temperatures differering from the external environment. And while emissivity of materials varies widely, precisely the same black-body spectrum is emitted by any material if in temperature equilibrium with it's environment. You will doubtless recall from a posting elsewhere that other considerations may also enter, having nothing to do with interference or surface emissivity phenomena.
 
Thankyou .
 

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