Spectral Apparatus Error Detection via Wavelength Integration
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Solution Overview
Problem
Existing spectral apparatuses face challenges in accurately measuring light due to wavelength shifts caused by disturbances, leading to decreased measurement accuracy when error detection is based solely on wavelength shift magnitude, as it fails to differentiate between shifts occurring within short or long periods and those with minimal impact on measurement.
Innovation Solution
The spectral apparatus incorporates a gap sensor and processors that detect errors by integrating the absolute difference between the spectral wavelength and a target wavelength, with error detection triggered when the integration value exceeds a threshold, and optionally uses a method involving additional values to filter noise, ensuring only significant wavelength shifts affecting measurement accuracy are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If error detection is performed based on the amount of wavelength shift exceeding a predetermined value, then wavelength shifts can be detected, but excessive error detection occurs when shifts happen during short periods, leading to reduced productivity
Solution Approach 1:
The system performs preliminary integration of wavelength shift amounts over the measurement period before making error detection decisions. This preliminary accumulation of data allows the system to distinguish between transient shifts and sustained deviations, preventing premature error detection and enabling faster processing while maintaining accuracy.
Solution Approach 2:
The system uses feedback from the integrated wavelength shift data to dynamically adjust error detection thresholds. By continuously monitoring the accumulated shift amount and comparing it against adaptive thresholds, the system can distinguish between insignificant transient shifts and significant sustained deviations, reducing false errors while maintaining measurement precision.
2Measurement precision
If error detection threshold is set to detect all wavelength shifts, then measurement accuracy is maintained, but false errors increase due to transient shifts, reducing productivity
Solution Approach 1:
The system performs preliminary integration of wavelength shift amounts over the complete measurement period before making error detection decisions. This preliminary accumulation allows transient shifts to be naturally filtered out through the integration process, as their impact is distributed over the entire period rather than concentrated at a single moment.
Solution Approach 2:
The system applies a weighted evaluation where the duration of wavelength shift is given partial weight in the error determination. By considering both the magnitude and temporal extent of shifts, the system can tolerate small transient deviations without triggering false errors while still detecting significant sustained shifts that truly affect measurement accuracy.
3Stability of the object's composition
If feedback control is used to maintain gap size, then wavelength stability is improved, but the system remains vulnerable to large disturbances that exceed control capabilities
Solution Approach 1:
The system performs preliminary integration of wavelength shift amounts over the measurement period to establish a baseline understanding of system behavior. This preliminary data collection enables the system to distinguish between normal control variations and genuine disturbance effects, allowing for more reliable error detection even when large disturbances occur.
Solution Approach 2:
The integration process acts as an intermediary between the raw wavelength shift data and the final error detection decision. By mediating through temporal integration, the system can filter out noise and transient effects while preserving information about genuine disturbances, thereby enhancing reliability without sacrificing stability control.
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 prevents excessive error detection by accurately identifying wavelength shifts with a substantial impact on measurement accuracy, allowing for quicker and more precise spectral measurement processing.
Implementation Method 1
a piezoelectric element that changes a gap size between the pair of reflection films
Implementation Method 2
an interference filter including a pair of reflection films disposed to face each other
Implementation Method 3
a capacitance detection circuit that detects capacitance according to the gap size between the reflection films
Data Source
AI summary
A spectral apparatus includes: an interference filter that includes a pair of reflection films and outputs light having a spectral wavelength corresponding to a gap size between the pair of reflection films; a gap sensor that detects the gap size; and one or more processors configured to detect an error based on a difference between the spectral wavelength corresponding to the gap size detected by the gap sensor and a target wavelength of light to be output from the interference filter. The one or more processors detect an error when an integration value obtained by integrating, on a time axis, an absolute value of the difference exceeds a threshold value.