Photon Counting

Photon counting is a technique used to detect and measure individual particles of light, called photons. Instead of measuring the overall brightness, photon counters register each photon as a discrete event, allowing precise measurement of very low light levels or rapid changes in light. This method is essential in scientific fields like quantum optics, astronomy, and medical imaging because it offers high sensitivity, accuracy, and temporal resolution, enabling detailed analysis of light sources at very low intensities or rapid processes.