3D Depth Sensor Using Periodic Light Pulses for Distance Measurement
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Solution Overview
Problem
Existing image sensors face challenges in accurately and efficiently determining the three-dimensional information of a target, such as distance, using methods like triangulation, interferometry, or time of flight, which are not sufficiently precise or efficient.
Innovation Solution
A depth sensor system that utilizes a light source, detector, and signal processor to measure the rate of change of reflected light, determining distance by analyzing the rate of change of sensed values and calculating the time delay corresponding to a maximum or minimum value, thereby multiplying the speed of light with the delay time to calculate the distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods like triangulation, interferometry, or time of flight are used to determine distances to target points, then three dimensional image information can be obtained, but the accuracy and efficiency of distance determination is insufficient
Solution Approach 1:
The patent applies periodic action by using a light source that emits light in periodic pulses rather than continuously. The controller generates control signals with reference time points at periodic intervals, and the detector measures reflected light during specific time periods with different time delays from these reference points. This periodic measurement approach enables efficient determination of time of flight while maintaining accurate distance measurement, directly resolving the contradiction between measurement precision and productivity.
2Reliability
If the detector measures reflected light continuously to determine distance, then complete information is captured, but the measurement process becomes inefficient and time-consuming
Solution Approach 1:
The patent implements preliminary action by pre-defining specific time periods for measurement with reference time points and predetermined time delays. The controller generates control signals in advance with these reference points established, and the detector is configured to measure only during these predetermined time windows. This eliminates the need for continuous monitoring and reduces measurement time while maintaining reliable distance determination through the rate of change analysis of reflected light.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for accurate and efficient measurement of distances to targets by determining the time delay corresponding to a maximum or minimum of sensed values, providing precise depth information.
Implementation Method 1
A depth sensor includes a light source, a detector, and a signal processor. The light source transmits a source signal to the target according to a transmit control signal having reference time points. The detector receives a reflected signal generated from the source signal being reflected from the target.
Implementation Method 2
The signal processor generates a plurality of sensed values by measuring respective portions of the reflected signal during respective time periods with different time delays from the reference time points. The signal processor determines the distance from the target from a rate of change of the sensed values.
Data Source
AI summary
A depth sensor includes a light source, a detector, and a signal processor. The light source transmits a source signal to the target according to a transmit control signal having reference time points. The detector receives a reflected signal from the source signal being reflected from the target. The signal processor generates a plurality of sensed values by measuring respective portions of the reflected signal during respective time periods with different time delays from the reference time points. The signal processor determines a respective delay time for a maximum/minimum of the sensed values for determining the distance of the target.