Comment by mikewarot

14 days ago

Note that the precision is very good, however the accuracy is nowhere near as close (fractions of a metre) in the atmosphere, due to the variable refractive index of air. Long term averages can help, of course.

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mikewarot

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Aurornis  14 days ago

They talk about this technique for ranging between satellites, which wouldn't have to deal with atmospheric conditions.

For ranging in an atmosphere they suggest dual-comb spectroscopy or two-color methods to account for the atmospheric changes.

  • westurner  9 days ago

    From > multispectral [UV + IR] camera ... optical, non-contact method to detect [blood pressure, hypertension, blood glucose levels, and diabetes]." [ for "Non-Contact Biometric System for Early Detection of Hypertension and Diabetes" https://www.ahajournals.org/doi/10.1161/circ.150.suppl_1.413... ]

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