IRAS Filter Profile: Computing ##\lambda_{mean}##

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Discussion Overview

The discussion revolves around the computation of ##\lambda_{mean}## in the context of the IRAS filter profile. Participants are exploring the definitions and sources of the variables involved, particularly ##T(\lambda)## and ##\lambda##, as well as the origin of transmittance data.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions the meaning of ##T(\lambda)## and ##\lambda## in the provided equation for computing ##\lambda_{mean}##.
  • Some participants propose that ##T## represents transmittance and ##\lambda## denotes wavelength.
  • Another participant seeks clarification on the source of the transmittance data used in the computation.
  • A later reply suggests that transmittance is typically measured and provides a link to relevant data.
  • One participant notes that the equation represents a mathematical expression for the mean value of ##T##, without clarifying what ##T## specifically refers to.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the definitions of the variables involved and the source of the transmittance data. No consensus is reached on these points.

Contextual Notes

Limitations include the lack of clarity on the definitions of ##T(\lambda)## and ##\lambda##, as well as the unspecified source of the transmittance data.

tryingtolearn1
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TL;DR
IRAS filter profile
I am looking at the following IRAS filter profile IRAS Filter Profile and I am wondering how they computed ##\lambda_{mean}##? They provided the following equation below but what is ##T(\lambda)## and ##\lambda##?
1602483020121.png

1602483045552.png
 
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Just a guess: T = transmittance and lambda = wavelength.
 
DrStupid said:
Just a guess: T = transmittance and lambda = wavelength.

thanks but where did they get the transmittance?
 
The equation itself is a mathematical expression for the mean value of T, whatever T is.
 

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