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felixfelex

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07-09-2020 05:25 AM

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Hallo,

i try to get from a light spectrum the maximum and Standard deviation. I Have a x and y Array with Wavelength a the measured intensity.

At the moment i get the Wavelength where the max of Intensity is, by mulitply the to arrays, searching for the max with the array min max and getting with the index the Wavelength.

When i search for the standard deviation of the intensity i dont know how to get to the Wavelength intervall.

Does anyone know how to handle my Problem

Greets

Felix

GerdW

Knight of NI

07-09-2020 06:03 AM - edited 07-09-2020 06:04 AM

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Hi (Hallo!) Felix,

it's nice you included some default values in your VI, so we can test with real data…

I simplified the VI as such:

What's wrong with the StDev you calculate so far?

Why do you need to multiply wavelength with amplitude?

@felixfelex wrote:

When i search for the standard deviation of the intensity i dont know how to get to the Wavelength intervall.

Which "Wavelength interval" are you interested in?

Best regards,

GerdW

using LV2011SP1 + LV2017 (+LV2020 sometimes) on Win10+cRIO

GerdW

using LV2011SP1 + LV2017 (+LV2020 sometimes) on Win10+cRIO

07-09-2020 06:11 AM

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Oh, your right the multply of amplitude and wavelenght was a mistake.

I try to get the widths of the sprectrum around the standard deviation of the Amplitude.

GerdW

Knight of NI

07-09-2020 07:10 AM

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Hi Felix,

@felixfelex wrote:

I try to get the widths of the sprectrum around the standard deviation of the Amplitude.

You know the peak amplitude and wavelength.

And you calculate some StDev value of the amplitudes: what exactly do you want to achieve with this value?

Can you attach an image to show/explain your requirement?

Best regards,

GerdW

using LV2011SP1 + LV2017 (+LV2020 sometimes) on Win10+cRIO

GerdW

using LV2011SP1 + LV2017 (+LV2020 sometimes) on Win10+cRIO

07-09-2020 08:07 AM

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GerdW

Knight of NI

07-09-2020 08:11 AM

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Hi Felix,

this is more math than I want to handle right now…

@felixfelex wrote:

i need the Width of the spectrum and for this i need the Standard devation.

The width of the spectrum is given by your data: there is a minimum and maximum wavelength…

When I asked for explanation I was expecting an image of the graph showing your measured spectrum and maybe two cursors to show the range of the data you want to determine by using the StDev…

Best regards,

GerdW

using LV2011SP1 + LV2017 (+LV2020 sometimes) on Win10+cRIO

GerdW

using LV2011SP1 + LV2017 (+LV2020 sometimes) on Win10+cRIO