Time measurement device and method useful in a laser range camer

Optics: measuring and testing – By alignment in lateral direction – With registration indicia

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356 505, 356 506, 368 89, 368239, 396171, 396172, G01C 308, G04F 3700, G04C 1700

Patent

active

058701800

ABSTRACT:
A time measurement device useful with laser range cameras and time-of-flight measuring methods includes a light transmitter responsive to start and stop signals for transmitting the light during a time interval to be measured, and a light receiver for receiving the light and for providing an output signal related to an exposure of the light during the time interval time between start and stop signals to the transmitter The output signal thus providing a measurement of the time between the start and the stop signals. The transmitter includes a light emitting diode to which an electrical current is provided for generating a constant output light source for the transmitter. The light receiver includes charged coupled devices (CCD) having a linear response to an amount of exposure to the light received from the light transmitter. As a result, the CCD provides the output signal in a linear relationship to the amount of exposure to the light, and thus a measurement of the time interval.

REFERENCES:
patent: 3440938 (1969-04-01), Stimson et al.
patent: 3789653 (1974-02-01), Brejaud
patent: 4155029 (1979-05-01), Yamaoka
patent: 4895440 (1990-01-01), Cain et al.

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