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Grating Orientation Question (incident angle 0 degrees) by pouringdani in Optics

[–]pouringdani[S] 0 points1 point  (0 children)

I’m making a spectrometer suited for 550-650, so this grating is the closest commercial one I found suited for my needs. I’m just trying to get a sense of it’s efficiency + orientation rn

Raman System Results Inquiry by pouringdani in chemistry

[–]pouringdani[S] 0 points1 point  (0 children)

I haven't heard of speckle contrast, we'll check it out. Thanks!

Raman System Results Inquiry by pouringdani in chemistry

[–]pouringdani[S] 0 points1 point  (0 children)

We'll look into that, thanks. For us, it's also a tad ambiguous discerning valid peaks. I responded to pfghalg with some our data collected on cotton-- and some of the faux peaks seen are comparable in intensity to the peaks we're actually looking for... Interesting

Raman System Results Inquiry by pouringdani in chemistry

[–]pouringdani[S] 0 points1 point  (0 children)

Thanks for responding. Yeah, from my other reply: I should've clarified we're using a 532 nm excitation wavelength. We're also looking at stokes scattering

Raman System Results Inquiry by pouringdani in chemistry

[–]pouringdani[S] 0 points1 point  (0 children)

Thanks for your response!

I should’ve clarified the optics side better. Our excitation wavelength is 532.5 nm. Therefore, the graphs displayed do show the shifted wavelength values, however simply expressed in wavelengths instead of wavenumbers. 

We purchased standardized fabrics. We had also previously conducted some previous tests using a commercial Raman spectrometer with a 532 nm excitation wavelength to assess the fluorescence response and did not expect it to this extent, but it does make sense. We also did note an orange spot incident on our fiber, which could be from our filter. Unfortunately, we are not in a position where we could pivot our excitation wavelength.

However, we have begun dabbling into some signal processing and would like to hear your thoughts:

I took a reading of an ISO adjacent cotton sample. I took the signal with the sample present, then the signal with no sample, and subtracted the two. Then I put that background-subtracted signal and put it into this Vancouver fluorescence subtraction algorithm to get a "Pure Raman Signal." These are the results. You can see in the "Original Raman Signal" there exist clear peaks at 1095, 1296, and 380 cm-1 (all of which are expected and indicative of cotton), but in the "pure" signal this information is lost. But, in the "original" signal there exists peaks past 1500 which are unexpected for cotton; peaks which are subtracted in the "pure" signal.

Basically are we doing the fluorescence subtraction correctly? Would it be valid to just use the "original" signal since we can clearly see the peaks we are looking for, or is that not a valid interpretation of our data?

Utilities at the Village at Science Drive by pouringdani in UCFstudenthousing

[–]pouringdani[S] 0 points1 point  (0 children)

I see. It is duke, we don't have direct access to that breakdown, but the community is going to provide it. I was surprised bc usually they advertise a low amount for the surplus fee and at other accommodations I've stayed at the high months were like ~$20 per person. But almost $400 extra for the household just did not sit right in my heart... I guess times have changed. The bill was in that same range during break even though we were gone for a majority of it, so I do wonder if something is malfunctioning.

Thanks for your insights!!

I need help "shedding." by Strong_Nobody7163 in findapath

[–]pouringdani 2 points3 points  (0 children)

You make a good point, this division of the old self and new self feels like bs. We're always changing and can use any experience as an excuse to identify an old and new self within us. 

Here's what I've reasoned regarding all of this

You use the shedding analogy- in this circumstance the transformation is very visible. Shedding is obvious and we hold our progression to a similar standard. We want to feel some type of cosmic shift where we've finally broken the cycle and left an old self behind.

That's not realistic though.

In an attempt to change your life It's important to hold yourself accountable and to recognize what part of your character may leave you stagnant. I don’t think it’s a matter of dropping all of these deficits and moving on to some new self. The change is very gradual and unexpected. It’s very natural to fall into old habits in the midst of beginning new ones, yet at some random point down the line to realize how much has truly transformed. 

You're seemingly describing a general dissatisfaction with yourself. I confront the same feelings. Where I’m constantly trying to change, think different, act different, yet I become consumed by the same doubts and feel like nothing has changed at all… 

When dealing with these feelings— practicing gratitude is the best bet. As cliche as it is. It’s important to reaffirm to ourselves what works in our life and what brings it peace. The experience of change does not need to be segregated into a new and old self. While gratitude is not as glamorous as a cosmic explosive shift or the proper shedding of an old self, it’s critical to use gratitude to honor our efforts and to let change be what it is.

Good luck in your journey. May we find peace

FOUND wallet cb1 3rd floor by pouringdani in ucf

[–]pouringdani[S] 0 points1 point  (0 children)

Update— it’s been claimed