- #1
Emperor42
- 15
- 0
Does anyone know of a simple relation between dark current and dark count in photon collection devices?
Emperor42 said:Does anyone know of a simple relation between dark current and dark count in photon collection devices?
Emperor42 said:Does anyone know of a simple relation between dark current and dark count in photon collection devices?
ZapperZ said:This is very device-dependent. Even within the same type of device, such as a phototube, the dark counts often vary noticeably. I've made antimonide-based phototube and even within the same processing run, the QE and dark counts of each phototube in the same batch often vary.
Zz.
Drakkith said:Do you happen to have a link explaining why the same processing run produces drastically different QE
Drakkith said:Do you happen to have a link explaining why the same processing run produces drastically different QE and dark counts in these types of devices (and others like CMOS and CCD)? I'm afraid my one class in semiconductor physics didn't get that in-depth.
Dark current is the unwanted electrical current that flows through a photon collection device even when no photons are being detected. It is typically caused by thermal energy and can lead to false readings and decreased sensitivity in the device.
Dark current can decrease the signal-to-noise ratio in a photon collection device, making it more difficult to detect and accurately measure photons. It can also cause a build-up of charge, leading to saturation of the device and a decrease in its dynamic range.
Dark count is the number of false detections or counts recorded by a photon collection device due to dark current. It can be measured by recording counts when no photons are present and subtracting this value from the total count when photons are present.
Dark count can be reduced by cooling the device, as lower temperatures decrease the thermal energy that causes dark current. Additionally, using materials with lower dark current, such as silicon, and optimizing the device's design can also help reduce dark count.
No, it is not possible to completely eliminate dark count in photon collection devices. However, it can be minimized through careful design and optimization, as well as temperature control. Additionally, dark count can be accounted for and corrected for in data analysis techniques.