Photon-DSP does not Require Tuning Ln+3 Ions

The frequencies and amplitudes that fluorescent seals emit varies according to dozens of factors many of which are mentioned in Patent US 10,176,661 B2.

I DO NOT try to “tune” or craft or engineer the details of the peaks profile that comes off my seal.

I look at a lot of possibles, and I pick the ones that are quirky, with sharp and highly distinct peaks, and somewhat unique. They stand out as distinctive, individual, and with good intensity (in arbitrary units).

But I do NOT seek to engineer or fabricate this or that peaks profile.

I examine what comes off the seal prototypes. I pick the sharpest, highest, and most distinctively unique. Then I record very carefully the shape of that peaks profile and store it in a file, under a file number, that also appears (covertly) on the individual item being examined for authentication (or not).

My machine must decide in under 1 second, which means my delta x axis increments must not be too small or too numerous. I want a 95% match in the peaks profile. More would take too much time.

So, I take what I get. I record it, under a file number. Then later I compare what I saw in the lab with what I see in the field when that same identical item comes back around to be authenticated.

So, engineering some specific peaks profile is not required or desired for Photon-DSP to perform its function.

Fine tuning the peaks profile is NOT something I have to do. I do seek profiles that have good amplitude, sharp peaks, and uniquely distinctive peaks, not profiles that are same old same old.

I want narrow peaks, and high ones, and sprinkled all up and down the spectral range from 200 nm to 1500 nm.

I want profiles that are as distinctive as baseball cards. I want many thousands of them. So I use 14 ways to vary them, see patent for details.

I use Fast Fourier methods to do my comparison quickly and with precise accuracy.

Beyond that I use an edited (by snippets) version of the full wide peaks profile, see patent for how the snippets are made and applied (in the lab first, and in the field later).

Robert Fenton Gary
17 March 2025
Hagerstown MD USA