Signal-to-Noise Ratio (SNR)

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The Signal-to-Noise Ratio is the ratio between the actual image (signal) and noise, used to measure the performance in providing a noise-free image in image intensifiers and optical sensors of digital night vision and thermal devices.

Typical specs are:

  • Gen 0[1]
    • SNR ~2
    • Gain >1
  • Gen 1[1]
    • SNR ~6
    • Gain ~70
  • Gen 2 (introduction of the MCP)[1]
    • SNR ~11
    • Gain 3.5k to 10k
  • Gen 2+[2]
    • SNR <30
    • Gain 10k to 60k
  • Advanced Gen 2+[3]
    • SNR <40
  • Gen 3[4]
    • SNR <35
    • Gain 20k to 80k
  • Advanced Gen 3[5]
    • SNR <50
    • Gain 60k to 120k

A very noisy and possibly dim image can be one sign of a end of life conditions if it can be assumed the factory specifications were considerably higher than what is observerd.

References

  1. ↑ 1.0 1.1 1.2 https://web.archive.org/web/20220927233831/https://www.photonics.com/Articles/Image_Intensification_The_Technology_of_Night/a25144
  2. ↑ https://web.archive.org/web/20220317190617/https://www.photonis.com/system/files/2020-11/201120c-Leafet-XR5.pdf
  3. ↑ https://web.archive.org/web/20210917045203/https://www.photonis.com/system/files?file=2021-05/210507%20Leaflet%204G%2B_0.pdf
  4. ↑ https://web.archive.org/web/20220812210329/https://www.asu-nvg.com/Documents%20and%20Settings/39/Site%20Documents/Product%20Spec%20Sheets/New/F9800M16G_M18G_M20GSpecSheet.pdf
  5. ↑ https://web.archive.org/web/20220829150300/https://tnvc.com/supergain/
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