Time-of-flight sensor and distance measuring method thereof

Abstract

The invention relates to a time-of-flight distance measuring sensor and a distance measuring method thereof. The distance measuring method comprises the following steps of: emitting pulse detection light to irradiate a detection field of view of the time-of-flight sensor; receiving reflected light reflected by a measured object, and generating inductive charges corresponding to the energy of the reflected light, the reflected light including pulse reflected light after the measured object reflects the pulse detection light and ambient light; accumulating inductive charges in a first charge accumulation window and a second charge accumulation window which are continuous in sequence; accumulating inductive charges generated by the ambient light within a third charge accumulation window, thethird charge accumulation window being in front of the first charge accumulation window or behind the second charge accumulation window and having a time interval; and performing calculating accordingto the charge quantities respectively obtained by the first charge accumulation window, the second charge accumulation window and the third charge accumulation window to obtain the distance information of the measured object. The detection accuracy of the time-of-flight distance measuring sensor is improved.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a time-of-flight sensor and a distance measuring method thereof. Background technique [0002] The Time Of Flight (TOF) method realizes the measurement of the three-dimensional structure or three-dimensional profile of the measured object by measuring the time interval from the emission to the reception of the pulse signal sent by the measuring instrument or the phase generated by the laser going back and forth to the measured object once. TOF measuring instruments can obtain grayscale images and distance images at the same time, and are widely used in many fields such as somatosensory control, behavior analysis, monitoring, automatic driving, artificial intelligence, machine vision, and automatic 3D modeling. [0003] Time-of-flight (TOF) sensors generally include: a light source module and a photosensitive module; the light source module is used to emit pulse detection light of...

AI Technical Summary

Problems solved by technology

However, in the actual detection process of the existing technology, it is usually interfered by the detection light, and cannot accurately detect the ambient light energy, resulting in poor accuracy of the obtained measurement distance

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