3 ms·

It does not say that anywhere on the page of the magazine but the paper seems to be open access: https://www.pnas.org/content/118/17/e2008819118 https://www.pn

It does not say that anywhere on the page of the magazine but the paper seems to be open access: https://www.pnas.org/content/118/17/e2008819118 https://www.pnas.org/content/118/17/e2008819118 (HTML) https://www.pnas.org/content/pnas/118/17/e2008819118.full.pdf https://www.pnas.org/content/pnas/118/17/e2008819118.full.pd... (PDF) There is a photograph of their "digital Lippmann camera" in the appendix but unfortunately no further information on it: https://www.pnas.org/content/pnas/suppl/2021/04/15/2008819118.DCSupplemental/pnas.2008819118.sapp.pdf https://www.pnas.org/content/pnas/suppl/2021/04/15/200881911... (PDF)

_Microft 5y ago
Would anyone have a look at the photo of the digital Lippmann camera and let me know what you think? There seems to be a camera on the left-hand side, a beam splitter in the center, a mirror to the top, another mirror on a translation-stage to the right which would leave the bottom for the incoming beam. So this digital Lippmann camera is "just" a Fourier transform spectrometer that has a camera instead of a single detector element as sensor, right? Compare: https://en.wikipedia.org/wiki/Fourier-transform_infrared_spectroscopy#Components https://en.wikipedia.org/wiki/Fourier-transform_infrared_spe...
- laserphysicist_ 5y ago
  Yes, you can call it a spatially-resolved FTSI, that's correct. There is a whole field of research around FTSI hyperspectral imagers. The big challenge is to get fast enough to get a decent time-resolution.
  - _Microft 5y ago
    To explain why this is „suddenly“ about time-resolution: the mirror on the translation stage is moved back and forth which changes the length of one arm of this interferometer. This movement takes time but is necessary as the interference pattern changes with position of the mirror. These changes are recorded and allow to compute the spectrum. Since the scanning takes time, this limits how fast images/spectra can be recorded.

_Microft 5y ago

Would anyone have a look at the photo of the digital Lippmann camera and let me know what you think? There seems to be a camera on the left-hand side, a beam splitter in the center, a mirror to the top, another mirror on a translation-stage to the right which would leave the bottom for the incoming beam. So this digital Lippmann camera is "just" a Fourier transform spectrometer that has a camera instead of a single detector element as sensor, right? Compare: https://en.wikipedia.org/wiki/Fourier-transform_infrared_spectroscopy#Components https://en.wikipedia.org/wiki/Fourier-transform_infrared_spe...

laserphysicist_ 5y ago
Yes, you can call it a spatially-resolved FTSI, that's correct. There is a whole field of research around FTSI hyperspectral imagers. The big challenge is to get fast enough to get a decent time-resolution.
- _Microft 5y ago
  To explain why this is „suddenly“ about time-resolution: the mirror on the translation stage is moved back and forth which changes the length of one arm of this interferometer. This movement takes time but is necessary as the interference pattern changes with position of the mirror. These changes are recorded and allow to compute the spectrum. Since the scanning takes time, this limits how fast images/spectra can be recorded.