| 摘要 |
The device and method for spatially resolved photodetection and demodulation of temporally modulated electro-magnetic waves make possible to measure phase, amplitude and offset of a temporally modulated, spatially coded radiation field. At micro-optical element (41) spatially averages a portion (30) of the scene and equally distributes the averaged intensity on two photo sites (51.1, 51.2) close to each other. Adjacent to each of these photo sites (51.1) are two storage areas (54.1, 54.2) into which charge from the photo site can be moved quickly (with a speed of several MHz to several tens or even hundreds of MHz) and accumulated essentially free of noise. This is possible by employing the charge-coupled device (CCD) principle. The device combines a high optical fill factor, insensitivity to offset errors, high sensitivity even with little light, simultaneous data acquisition, small pixel size and maximum efficiency in use of available signal photons for sinusoidal as well as pulsed radiation signals. Preferential use is in a time-of-flight (TOF) range imaging system without moving parts, offering 2D or 3D range data.
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