In general, the sensitivity characteristics of sensors used in cameras are often indicated by graphs representing QE (quantum efficiency) on the vertical axis and wavelength on the horizontal axis.
Here’s an image.
In this case, the quantum efficiency is 5% at a wavelength of 950 nm and 60% at a peak wavelength of 550 nm.
The maximum efficiency of this sensor is 60%, so the sensitivity at a wavelength of 950 nm is about 8.3% of the sensitivity at the peak wavelength.
In the case of infrared sensors, there is also a graph notation as follows.
In this case, QE will be a diagonal line, and we will read from that line. At wavelengths of 450nm~700nm, the quantum efficiency is 65%, and at 950nm, it is 20%.
20/65 = 31%, and the sensitivity at the wavelength of 950 nm is about 30% of the sensitivity at the peak wavelength.Top of Form
