Optical Measurement Device Noise Detection Threshold
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Solution Overview
Problem
Conventional optical measurement devices require setting a threshold value for each measurement condition to determine noise in measured distances, which is impractical due to variations in light amount caused by exposure time, target type, and movement speed.
Innovation Solution
An optical measurement device sets a threshold value for the received light amount per unit time based on feature information, allowing for noise determination without setting thresholds for each measurement condition, using a controller and sensor head to stabilize light amount variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threshold value for received light amount is set to determine noise in measured distance, then noise detection capability is improved, but the complexity of setting different thresholds for each measurement condition increases
Solution Approach 1:
The patent changes the parameter from 'received light amount' to 'received light amount per unit time' (received light amount divided by exposure time). This parameter transformation makes the threshold independent of exposure time variations, allowing a single universal threshold to work across different measurement conditions without requiring condition-specific threshold settings.
Solution Approach 2:
The patent creates a universal threshold value that can be applied across all measurement conditions. By normalizing the received light amount with respect to exposure time, the same threshold works for different targets, movement speeds, and exposure times, eliminating the need for multiple condition-specific thresholds.
2Measurement precision
If a threshold value is set for each measurement condition to accurately detect noise, then measurement precision is improved, but the ease of operation deteriorates due to multiple threshold settings
Solution Approach 1:
The patent transforms the parameter to 'received light amount per unit time' by dividing the received light amount by the exposure time. This parameter change eliminates the dependency on exposure time, allowing users to operate the device without needing to adjust or set different thresholds for different exposure conditions, thereby improving ease of operation while maintaining measurement precision.
3Device complexity
If the received light amount is used directly for noise determination, then the influence of device variations is reduced, but the reliability deteriorates due to great variations caused by measurement conditions
Solution Approach 1:
The patent changes the parameter from raw 'received light amount' to 'received light amount per unit time' (received light amount divided by exposure time). This normalization eliminates the great variations caused by different exposure times, movement speeds, and target types, thereby improving the reliability of noise determination while minimizing the influence of device variations.
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 enables accurate noise detection and distance measurement by using a constant reference value for light amount per unit time, reducing the influence of device variations and eliminating the need for condition-specific threshold settings.
Implementation Method 1
a light reception part that receives light projected from a light projection part and outputs a signal corresponding to the received light amount
Data Source
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AI summary
Without requiring that thresholds 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 100 obtains measured values on the basis of the amount of reflected light that is received after being reflected by an object TA. The optical measurement device 100 comprises a setting unit 52 for setting a threshold for the amount of received reflected light per unit of time on the basis of characteristic information relating to the amount of light of the optical measurement device 100 and a determination unit 53 for determining whether there is measured value noise on the basis of the threshold.