Optical Window Contamination Detection With Temperature Compensation
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Solution Overview
Problem
Existing technologies fail to effectively detect contamination on optical windows due to temperature changes, leading to false positives or negatives in detection.
Innovation Solution
An optical window inspection apparatus with first and second detection light projectors and a control unit that emits second detection light receivers and a control unit that emits second detection light receivers and a control unit that emits second detection light receivers, which emits second detection light without passing through the optical window, allowing for correction of first detection light values based on the second detection light values, allowing for detection of contamination, and a control unit that emits contamination detection, and a control unit that emits second detection light without passing through the optical window, allowing for correction of first detection light values based on second detection light values, allowing for detection of contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detection light passes through the optical window to detect contamination, then contamination detection is enabled, but temperature changes cause false detection or non-detection
Solution Approach 1:
The detection system is segmented into two independent detection paths: one through the optical window (first detection light) and one bypassing the optical window (second detection light). This segmentation allows the system to separately measure contamination effects and temperature effects, resolving the contradiction between detection reliability and measurement precision under temperature variations.
Solution Approach 2:
The second detection light acts as an intermediary reference that does not pass through the optical window. It serves as a control for temperature-induced variations in the detection system, allowing the first detection light's results to be corrected for temperature effects while maintaining contamination detection capability.
2Device complexity
If a single detection light path is used, then device complexity is low, but temperature sensitivity causes false positives and negatives
Solution Approach 1:
The detection system is divided into two parallel light paths with distinct functions: the first path (through optical window) detects contamination, while the second path (bypassing optical window) detects temperature effects. This segmentation increases device complexity minimally while dramatically improving detection stability under temperature variations.
Solution Approach 2:
The system changes the detection parameter by introducing a second detection light with different optical path characteristics. This parameter change enables simultaneous measurement of both contamination and temperature effects, allowing the system to maintain high reliability without excessive complexity.
3Measurement precision
If temperature compensation is added to correct for temperature effects, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The system performs self-service temperature compensation by using the second detection light to automatically measure and correct for temperature effects in the first detection light. The control unit processes both signals to compensate for temperature-induced voltage variations without requiring external temperature sensors or complex compensation algorithms.
Solution Approach 2:
The second detection light serves as an intermediary reference signal that enables temperature compensation. By measuring the temperature effect through this reference path, the system can correct the main detection path's measurements, improving voltage measurement accuracy while keeping the overall system structure relatively simple.
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
Reduces false detection and non-detection of contamination on the optical contamination by contamination on the optical window, allowing for detection of contamination, and a control unit that emits second detection light without passing through the optical window, allowing for correction of first detection light values, allowing for detection of contamination, and a control unit that emits second detection light without passing through the optical window, allowing for correction of first detection light values based on second detection light values, reducing false detection and non-detection of contamination.
Implementation Method 1
a light emitting element (i.e. a light emitting diode) of the detection apparatus emits detection light
Implementation Method 2
a photodiode used as the light receiving element... the output voltage of a photodiode used as the light receiving element
Data Source
AI summary
An optical window inspection apparatus including: a first light projector that emits first detection light that passes through an optical window transmitting incident light; a second light projector that emits second detection light that does not pass through the optical window; a light receiver that receives the first detection light and the second detection light in which a first voltage corresponding to an intensity of the received first detection light and a second voltage corresponding to an intensity of the received second detection light are generated; and a control unit that corrects a value of the first voltage based on a value of the second voltage and a predetermined reference value and performs processing to detect contamination of the optical window based on a corrected value of the first voltage.