Laser Rangefinder Edge Detection via Signal Segmentation
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Solution Overview
Problem
Laser rangefinder systems face challenges in accurately detecting target edges due to beam divergence and ambient noise, which affects precision in determining the range and alignment of targets, especially at longer distances.
Innovation Solution
A device equipped with a processor that analyzes the intensity of reflections over time to detect target edges, using ratiometric scaling and an array of optical sensors to determine the target's extent and automatically select the target, applying a visual marker for alignment and tracking, while controlling the discharge of a firearm to ensure accurate targeting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser beam is used for rangefinding, then range measurement capability is provided, but beam divergence causes overlapping with multiple objects and reduces measurement precision
Solution Approach 1:
The patent segments the received optical signal into multiple discrete samples corresponding to different spatial positions across the beam profile. By analyzing intensity variations among these segmented samples, the system can detect edges and boundaries of targets even when the beam diverges and overlaps multiple objects, thus resolving the precision issue caused by beam spread.
Solution Approach 2:
The patent applies local quality analysis by examining the intensity characteristics of individual beam samples at different positions. By identifying local maxima and minima in the intensity profile, the system can precisely locate target edges and boundaries, maintaining high measurement precision despite the overall beam divergence affecting the entire measurement area.
2Reliability
If ambient light is received by optical sensor, then continuous monitoring capability is provided, but ambient light represents noise and reduces signal quality
Solution Approach 1:
The patent employs periodic modulation of the laser beam and corresponds sampling of reflected light at specific time intervals. By synchronizing the detection with the periodic beam emission and using time-gated sampling, the system can distinguish the modulated laser return signal from continuous ambient light noise, thereby maintaining high detection reliability in noisy environments.
Solution Approach 2:
The patent implements feedback mechanisms where the detected signal characteristics are continuously analyzed and used to adjust detection parameters. By comparing expected signal patterns with actual measurements and filtering out deviations consistent with ambient noise, the system maintains reliable target detection despite the presence of harmful ambient light factors.
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
The solution enhances the precision of target detection and alignment by accurately determining target edges and boundaries, even with beam divergence, and ensures accurate firearm discharge by automatically selecting and tracking targets, improving the overall accuracy and reliability of the laser rangefinder system.
Implementation Method 1
A time difference between the emission of the focused beam and the reception of the reflected light can be used to determine a range between the laser rangefinder device and an object within the view area
Implementation Method 2
detect light from the view area... receive reflections corresponding to an object within the view area
Data Source
AI summary
In some embodiments, a device may include a laser rangefinder circuit including an emitter configured to direct a focused beam toward a view area and including one or more optical sensors configured to receive light including ambient light and reflections associated with the view area. The device may further include a processor coupled to the laser rangefinder and configured to determine an edge of an object within the view area based on measurements of the reflections.