35:14 interesting about 950nm is that this wavelength is highly absorbed by (atmospheric) water-vapor, meaning that sensors at this wavelength are relatively unaffected by sunlight - most of the 950nm from sunlight is eliminated by atmospheric water-vapor.
Interesting new development - most red and IR-sensitive photoelectric compositions (especially emitters) are highly temperature-sensitive. Gallium nitride, on the other hand, is less so. If insensitivity to temperature is critical, and immunity to ambient light can be provided in a different manner, it is often advantageous to use GaN or InGaN based optical devices - either blue, directly, or photon-converted amber (PC Amber) if using conventional (Si-based) photodiodes that don't like blue wavelengths 33:14 .
Errata - plants don't absorb 30:36 green (one of the mysteries of evolution, as to why this evolved this way - perhaps availability of chlorophyll-like molecules?) - rather they reflect it, preferentially absorbing red and blue.
35:14 interesting about 950nm is that this wavelength is highly absorbed by (atmospheric) water-vapor, meaning that sensors at this wavelength are relatively unaffected by sunlight - most of the 950nm from sunlight is eliminated by atmospheric water-vapor.
11:28 (errata) *Odd* multiples, 120 Hz, 360 Hz, etc.
Interesting new development - most red and IR-sensitive photoelectric compositions (especially emitters) are highly temperature-sensitive. Gallium nitride, on the other hand, is less so.
If insensitivity to temperature is critical, and immunity to ambient light can be provided in a different manner, it is often advantageous to use GaN or InGaN based optical devices - either blue, directly, or photon-converted amber (PC Amber) if using conventional (Si-based) photodiodes that don't like blue wavelengths 33:14 .
Errata - plants don't absorb 30:36 green (one of the mysteries of evolution, as to why this evolved this way - perhaps availability of chlorophyll-like molecules?) - rather they reflect it, preferentially absorbing red and blue.