Id like to thank everybody for there responses on this topic yesterday.
It has given me direction and a lot of cool things to think about. (I had a feeling flash meters weren't straight forward). Also pointed me in the direction of some new and totally cool equipment.
Thanks once again to all
Br
CHUCK STEWART
SENIOR SOFTWARE ENG.
>-----Original Message-----
>From: ext Ron.Simonson [mailto:ron.simonson@analog.com]
>Sent: 21 May 2008 19:31
>To: Stewart Charles (Vertu/ChurchCrookham)
>Subject: Re: [vrf] Photo Flash Intensity
>
>Good morning Charles, I do not fully understand the task that you are
>trying to solve. Will the flash tube be placed in an integrating
>sphere or other such contrivance to capture all the emitted light? Or
>are you trying to capture the photons from a more focused, defined
>region? I have not kept up with optics for some time now but I suspect
>that even though many flash lamps are pretty long duration emitters, a
>photo-cell may be a bit on the slow side.
>Calibration
>for photo-diodes is pretty straight forward in zero or reverse bias so
>I tend to use them this way for optical measurements.
>
>I think I would just use a photo-diode, a good fast trans-impedance
>amplifier, and a fast digitizing scope. You can calculate area under
>the curve, peak amplitude, and the various timing bits as needed.
>Maybe a good application of the Matlab code in VEE. I tend to save the
>data on a computer and then use octave to do the analysis.
>
>Of course I do not know the end result that you are after so the above
>may or may not be relevant. Do you need to be concerned with spectral
>response issues?
>What are the accuracy requirements on the measurements in time and
>amplitude?
>
>Talk to you later. Ron.
>
---
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It has given me direction and a lot of cool things to think about. (I had a feeling flash meters weren't straight forward). Also pointed me in the direction of some new and totally cool equipment.
Thanks once again to all
Br
CHUCK STEWART
SENIOR SOFTWARE ENG.
>-----Original Message-----
>From: ext Ron.Simonson [mailto:ron.simonson@analog.com]
>Sent: 21 May 2008 19:31
>To: Stewart Charles (Vertu/ChurchCrookham)
>Subject: Re: [vrf] Photo Flash Intensity
>
>Good morning Charles, I do not fully understand the task that you are
>trying to solve. Will the flash tube be placed in an integrating
>sphere or other such contrivance to capture all the emitted light? Or
>are you trying to capture the photons from a more focused, defined
>region? I have not kept up with optics for some time now but I suspect
>that even though many flash lamps are pretty long duration emitters, a
>photo-cell may be a bit on the slow side.
>Calibration
>for photo-diodes is pretty straight forward in zero or reverse bias so
>I tend to use them this way for optical measurements.
>
>I think I would just use a photo-diode, a good fast trans-impedance
>amplifier, and a fast digitizing scope. You can calculate area under
>the curve, peak amplitude, and the various timing bits as needed.
>Maybe a good application of the Matlab code in VEE. I tend to save the
>data on a computer and then use octave to do the analysis.
>
>Of course I do not know the end result that you are after so the above
>may or may not be relevant. Do you need to be concerned with spectral
>response issues?
>What are the accuracy requirements on the measurements in time and
>amplitude?
>
>Talk to you later. Ron.
>
---
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To send messages to this mailing list, email "vrf@agilent.com".
If you need help with the mailing list send a message to "owner-vrf@it.lists.it.agilent.com".
Search the "unofficial vrf archive" at "http://www.vrfarchive.com/vrf_archive".
Search the Agilent vrf archive at "http://vee.engineering.agilent.com".
Search the Agilent vrf archive at "http://vee.engineering.agilent.com".