Relation of radiation wavelength and photosynthetic photon flux?

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Discussion Overview

The discussion centers around the relationship between photosynthetic photon flux and the corresponding wavelength of ultraviolet radiation, particularly in the context of using a specific ultraviolet sensor. Participants explore how to determine the wavelength from the flux measurement and whether the wavelength can indicate the type of ultraviolet radiation.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • Farah inquires about determining the wavelength of radiation based on the photosynthetic photon flux output from an ultraviolet sensor.
  • Simon Bridge suggests that the flux alone does not provide enough information to ascertain the wavelength, comparing it to knowing the number of guests at a party without knowing their ages.
  • Farah expresses difficulty in finding relevant specifications in the sensor manual that would help identify the wavelength.
  • Another participant notes that the manual should contain information about the wavelengths to which the sensor is sensitive, possibly including a graph of sensitivity against wavelength.
  • This participant also mentions the possibility of using detectors that can record energy across different channels for more detailed analysis.

Areas of Agreement / Disagreement

Participants do not reach a consensus on how to determine the wavelength from the photosynthetic photon flux, and there are multiple viewpoints regarding the utility of the sensor's specifications.

Contextual Notes

Limitations include the lack of specific information in the sensor manual and the potential for different interpretations of the data provided by the sensor.

Farah
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Dear all,

If I have the value of photosynthetic photon flux in unit [ micro mole per meter square per second] as an output for ultra violet sensor.
How can I know the corresponding wavelength of that radiation ? and can I know from that wavelength what is the type of the ultraviolet radiation ?

Thank you and looking forward for your help.
Farah
 
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Welcome to PF;
How can I know the corresponding wavelength of that radiation ?
From the flux alone? - you can't. It's like having a doorman who counts people entering or leaving a party, and expecting to tell, from just the number of guests, how old they are.

You have to check the manufacturers specs for the sensor you used for the bandwidth and sensitivity.

The rest is stuff that it is good for you to look up.
 
Dear Simon Bridge,
Thank you for your response.
I tried to know any thing from the specifications of the sensor related to that but I could not.
Here are the specifications in this manual (page 6) : http://www.apogeeinstruments.com/content/SU-100manual.pdf

Can you help me please to figure out any thing related to what I want ?
Regards,
Farah
 
The manual should tell you the wavelengths that it is sensitive to.
That information is usually given quite early on where they describe the instrument.
In the main part of the manual there will probably be a graph showing sensitivity (or similar) against wavelength.
Or they may use frequency instead or wavelength.

I cannot help you to figure out any thing related to what you want because you haven't told me what you want to achieve. You've only ruled out one path to what you want to achieve.

Note: pouring through manuals is not my idea of a fun evening.
You can get detectors that record energy in different channels and output to a computer.
 

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