31. A second photodiode ( or a linear array of photodiodes ) is positioned farther along the length of the sensor. 32. The scattered light passes through a special transforming lens system and is collected on a number of concentric photodiode rings. 33. ASPs are typically composed of two gratings ( a diffraction grating and an analyzer grating ) above a single photodiode . 34. The 1064 nm laser return was split to the LIDAR receiver ( an avalanche photodiode detector ) using a dichroic filter. 35. However, EUV photon count is determined by the number of electrons generated per photon that are collected by a photodiode . 36. This frameless design is more elaborate than the framed style, relying on reflecting the light back to a single photodiode . 37. When the emitted beam bounces off the floor, the reflected energy is almost exclusively concentrated on the first adjacent photodiode . 38. TES single-photon detectors suffer nonetheless from a few disadvantages as compared to their avalanche photodiode ( APD ) counterparts. 39. The scintillator absorbs the X-rays and converts them into visible light photons that then pass onto the photodiode array. 40. Arrays of detectors, such as charge coupled devices ( CCD ) or photodiode arrays ( PDA ) can also be used.
