An innovative technique for three-dimensional imaging is presented, which u
ses the ratio of intensities of a pair of two-dimensional images to extract
timing information. The principal advantage of this method is the ability
to measure position and time for an almost unlimited number of particles hi
tting the detector simultaneously. The detector is capable of subnanosecond
time resolution and position resolution of about 50 mu m. The photodissoci
ation of H-2(+) is used to demonstrate the capability of the detector. (C)
2000 American Institute of Physics. [S0034-6748(00)03508-5].