Method and device for recording a three-dimensional distance-measuring image
First Claim
1. A method for recording a three-dimensional distance-measuring image of an object by measuring light propagation times, comprising:
- transmitting light pulses from a light source to an object surface;
receiving backscattered light pulses by a photodetector with short time integration;
calculating an object point distance in each case from light propagation time of the light pulses, wherein a trigger signal produced for starting a light pulse is applied at a same time on a receiving side with a trigger delay that increases gradually in time increments for opening at least one integration window for receiving the backscattered light pulses;
generating a correlation function from overlapping in time domain of the integration window and the backscattered light pulse, andin each predetermined trigger delay, a multiple illumination is implemented with an integration window opened for each illumination for cumulative integration of reflected light pulses.
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Abstract
The invention relates to methods and devices for recording three-dimensional distance-measuring images of an object surface by measuring light propagation time using a short-term integrated photodetector. For starting a light-induced pulse on the transmission side, a trigger signal is produced that is at the same time used on the receiving side for opening at least one integration window for receiving back-scattered light-induced pulses with a predetermined time delay. A predetermined event such as a maximum or a zero crossing is detected which, by its interval relative to the integration windows, determines a trigger delay. The trigger delay is correlated with the light propagation time and allows calculation of the object point distance d.
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Citations
18 Claims
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1. A method for recording a three-dimensional distance-measuring image of an object by measuring light propagation times, comprising:
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transmitting light pulses from a light source to an object surface; receiving backscattered light pulses by a photodetector with short time integration; calculating an object point distance in each case from light propagation time of the light pulses, wherein a trigger signal produced for starting a light pulse is applied at a same time on a receiving side with a trigger delay that increases gradually in time increments for opening at least one integration window for receiving the backscattered light pulses; generating a correlation function from overlapping in time domain of the integration window and the backscattered light pulse, and in each predetermined trigger delay, a multiple illumination is implemented with an integration window opened for each illumination for cumulative integration of reflected light pulses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device for recording a three-dimensional distance-measuring image of an object by measuring light propagation times, comprising:
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a light pulse illumination with a single light source for illuminating the object surface; a CMOS sensor with a plurality of sensor points as the photodetector, with pixel-based short time integration; a control and processing unit, that controls at least triggering on a transmission side and a receiving side and calculates distance values from voltage signals, a delay, gradually incrementing the delayed time, line between the control and processing unit and the CMOS receiving sensor for preparing an incrementally adjustable trigger delay; and trigger cables configured to the light pulse illumination and to the CMOS receiving sensor. - View Dependent Claims (17, 18)
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Specification