Optical Ranging with Phase-Change Pulses for Noise-Robust Distance Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical ranging devices face challenges in accurately measuring distances due to noise and waveform distortion in the reception light pulse, leading to ranging errors.
Innovation Solution
The optical ranging device employs phase modulation of light pulses with distinct phase change points, allowing for the extraction of phase information to calculate distances based on phase change points of transmitted and received light pulses, thereby reducing the impact of noise and waveform distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional ToF system is used to measure distance, then the device can acquire distances of objects in a wide range remotely, but the ranging accuracy is poor due to noise and waveform distortion in the reception light pulse
Solution Approach 1:
The patent changes the parameter from amplitude-based measurement to phase-based measurement. By modulating the light pulse with a carrier wave and detecting phase changes, the system becomes resistant to amplitude noise and waveform distortion, thereby improving ranging accuracy while maintaining the ability to measure wide ranges remotely
Solution Approach 2:
The patent introduces phase information as an intermediary carrier that encodes distance information. Instead of directly measuring amplitude or time of flight, the system uses phase changes of the modulated light pulse as an intermediary to extract distance data, which proves more robust against noise and distortion
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 approach enhances ranging accuracy by utilizing phase information resistant to amplitude noise, enabling precise time measurement and improved distance calculation.
Implementation Method 1
a light pulse generation means for generating a light pulse with a phase change point between a first phase modulation portion and a second phase modulation portion
Implementation Method 2
a light-transmitting means for transmitting the generated light pulse
Implementation Method 3
a light-receiving means for receiving a light pulse reflected from a measurement object by the transmitted light pulse
Implementation Method 4
a distance calculation means for calculating a distance to the measurement object, based on a phase change point of the transmitted light pulse and a phase change point of the received light pulse
Data Source
AI summary
An optical ranging device (10) according to the present disclosure includes a light pulse generation unit (11) that generates a light pulse with a phase change point between a first phase modulation portion and a second phase modulation portion, a light-transmitting unit (12) that transmits the generated light pulse, a light-receiving unit (13) that receives a light pulse reflected from a measurement object by the transmitted light pulse, and a distance calculation unit (14) that calculates a distance to the measurement object, based on a phase change point of the transmitted light pulse and a phase change point of the received light pulse.