Range Detector Device with Estimated Spread Value
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Solution Overview
Problem
Range finding devices often provide slower responses due to the need for multiple distance samples to estimate repeatability, which is a drawback in applications requiring quick proximity detection.
Innovation Solution
A range detector device that includes a pulsed light source, a detector, and a processor configured to generate a measured range value and an estimated statistical value for the spread of possible range values based on characteristics such as pulse width, ambient light, and self-interference, allowing for the estimation of standard deviation without additional measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple distance samples are taken to estimate repeatability, then measurement precision is improved, but response time deteriorates
Solution Approach 1:
The patent changes the parameter from taking multiple distance measurements to using a single measurement combined with pulse width characteristics. The standard deviation is estimated based on the pulse width and other system parameters rather than through repeated sampling, thus resolving the contradiction between measurement precision and response time.
Solution Approach 2:
The patent replaces the mechanical approach of repeated physical measurements with a computational model that estimates standard deviation from pulse width characteristics and system parameters. This substitution of physical repetition with mathematical modeling achieves the same goal faster.
2Measurement precision
If pulse width is reduced to improve time resolution, then measurement precision is improved, but signal strength deteriorates
Solution Approach 1:
The patent uses parameter changes by estimating the standard deviation from the pulse width and other system parameters through a computational model. This allows the system to maintain shorter pulse widths for better time resolution while compensating for signal strength issues through statistical estimation rather than requiring higher energy pulses.
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
Enables faster and more accurate estimation of standard deviation, improving response time and accuracy in range detection by using a single measurement, and optimizing pulse width settings based on environmental conditions.
Implementation Method 1
a pulsed light source configured to emit pulsed light to an object, a detector configured to receive reflected pulsed light from the object
Implementation Method 2
detector configured to receive reflected pulsed light from the object
Implementation Method 3
the detector may comprise a single photon avalanche photodiode (SPAD) array
Data Source
AI summary
A range detector device may include a pulsed light source configured to emit pulsed light to an object, a detector configured to receive reflected pulsed light from the object, and a processor cooperating with the pulsed light source and the detector. The processor may be configured to generate a measured range value to the object, and generate an estimated statistical value for a spread of possible range values based upon a characteristic of the pulsed light source.