Optical Measurement Device Noise Detection Using Light-Rate Thresholds
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Solution Overview
Problem
Conventional optical measurement devices struggle with noise in measured distances due to varying light amounts influenced by measurement conditions, requiring individual threshold settings for each condition, which is impractical and error-prone.
Innovation Solution
An optical measurement device sets a threshold value for received light amount per unit time based on feature information, using relative coefficients to suppress variations inherent in the device, allowing noise detection without specific condition-based adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a threshold value for received light amount is set in advance for each measurement condition, then noise detection accuracy is improved, but device complexity and ease of operation deteriorate due to the need to manage multiple condition-specific thresholds
Solution Approach 1:
The patent changes the parameter from absolute received light amount to received light amount per unit time (temporal normalization). This transformation makes the threshold applicable across different measurement conditions (exposure times, moving speeds) without requiring multiple condition-specific thresholds, thus resolving the contradiction between noise detection accuracy and device complexity
Solution Approach 2:
The patent creates a universal threshold setting that works across all measurement conditions by using received light amount per unit time. A single threshold value can be used regardless of exposure time, moving speed, or target type, eliminating the need for multiple condition-specific thresholds and simplifying operation
2Measurement precision
If a threshold value for received light amount is set in advance for each measurement condition, then noise detection accuracy is improved, but ease of operation worsens due to the burden of setting multiple thresholds
Solution Approach 1:
By transforming the parameter to received light amount per unit time, the system enables a single universal threshold to work across all conditions. Users no longer need to manually set different thresholds for different exposure times or moving speeds, significantly improving ease of operation while maintaining noise detection accuracy
Solution Approach 2:
The system automatically adapts to different measurement conditions through the temporal normalization approach. The received light amount per unit time inherently accounts for exposure time variations, eliminating the need for user intervention to adjust thresholds for different conditions
3Difficulty of detecting and measuring
If received light amount threshold is used for noise detection, then noise detection capability is improved, but measurement reliability deteriorates due to light amount variations from measurement conditions
Solution Approach 1:
The patent changes from using absolute received light amount to received light amount per unit time for threshold comparison. This temporal normalization removes the influence of exposure time and moving speed variations, allowing reliable noise detection across different measurement conditions without sacrificing measurement reliability
Data Source
AI summary
Without requiring that threshold values be set for each measurement condition, the present invention makes it possible to determine whether noise that can occur in measured values is present. An optical measurement device acquires measured values on the basis of the amount of reflected light that is received after being reflected by a target. The optical measurement device comprises a setting part for setting a threshold value for the amount of received reflected light per unit time on the basis of feature information regarding the light amount of the optical measurement device and a determination part for determining whether there is measured value noise on the basis of the threshold value.