Hi,
There are spectra collected by asd spectroradiometer in lab environment with one source lamp on. Snapshot imaging done on the same sample with a different source lamp in the same lab environment. Extracted spectra from the snapshot images and continuum removed spectra of both asd and snapshot are compared. Although they match in absorption features, they show a certain difference in the spectra. How will I model it? Is there a way to do some quantitative analysis between the spetra of these two sensors. Attached are the images of plots showing thick lines representing asd and dashed lines representing the snapshot imager. The samples used were different beach sand samples.
Regards,
Sundara
Looking at the spectra, there is a feeling that the cause is in the different intensity of the radiation from the lamps. Or sensitivity of the measuring channel. This is only the version.
The asd gun was looking at the sample from just 2 inches from the sample at nadir. Whereas the snapshot was looking at the sample at an angle 1 feet away from the sample.
This confirms my version that the reason is in the different sensitivity of the two instruments.
@Victor Ryzkov, here attaching the spectra of raw image samples of white reference (spectralon) and monazite and reflectance spectra of asd and hyperspectral imaging device along with continuum removed spectra. The reflectance image generated from imaging device from the raw files still exhibits the envelope of white reference in the scene when compared to asd spectrum. Any suggestions how to remove the envelope?
I do not understand your question? What I see:
1. In Fig. monazite - the usual spectrum.
2. In Fig. white_ref - it is not a white spectrum. This is the saturation (restriction) of the curve. Here either a very high intensity of the lamp radiation or a very high sensitivity of the measuring channel. It is necessary to reduce one of these parameters.
3. In Fig. monazite_reflectance - the usual spectrum.
4. In Fig. asdvsimagingmeter - two spectra from instruments with different sensitivity. It is necessary to level the sensitivity of these two instruments.
5. In Fig. asdvsimagingmetercontinuumremoved - two well-coincided spectrums.
What's the question?
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