比较器用来检测单个光子的伽马辐射。示意图、 设计注意事项和组件选择进行讨论。Maxim/Dallas > App Notes > AMPLIFIER AND COMPARATOR CIRCUITS AUTOMOTIVE MEASUREMENT CIRCUITS Keywords: gamma ray, photon, radiation detector, low noise op amp, PIN, photodiode, gamma radiation, Jul 21, 2003 operation amplifiers, op amps, comparator APPLICATION NOTE 2236 Gamma-Photon Radiation Detector A PIN photodiode, four low-noise op amps and a comparator are used to detect individual photons of gamma radiation. The schematic, design considerations and component selection are discussed. The circuit of Figure 1 includes a PIN photodiode that detects individual photons of gamma radiation. When a photon strikes a depletion region created by reverse bias on the photodiode, it produces a small amount of charge in proportion to the photon's energy. The resulting signal is then……