Time-of-flight sensor and distance measuring method thereof

Abstract

The invention relates to a time-of-flight sensor and a distance measuring method thereof. The distance measuring method of the time-of-flight sensor comprises the following steps of: emitting pulse detection light to irradiate a detection field of view of the time-of-flight sensor; receiving the reflected light reflected by a measured object, and generating inductive charges corresponding to the energy of the reflected light; accumulating the inductive charges in a first charge accumulation window and a second charge accumulation window in sequence, wherein the window durations of the first charge accumulation window and the second charge accumulation window are the same, during long-distance detection, the pulse width of the pulse detection light is smaller than the window duration; and performing flight time calculation according to the charge quantities obtained by the first charge accumulation window and the second charge accumulation window so as to obtain distance information corresponding to the flight time. According to the method, power consumption is saved while long-distance distance measurement is achieved.

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...

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Problems solved by technology

[0004] In some specific usage scenarios, it is necessary to measure objects within a certain distance in the distance. In the prior art, in order to increase the measurement distance, it is usually achieved by increasing the pulse width of the detection light to increase the detection range. , and the increase of the pulse width will lead to a longer lighting time, which will increase the power consumption of the measurement

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