Adjustable Color Source Gas Detection with Treated Tape
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Solution Overview
Problem
Existing gas detectors using single wavelength LEDs have limited sensitivity for detecting multiple types of gases, as they are highly sensitive to a single type of gas and poorly sensitive to others, making them ineffective for multi-gas detection.
Innovation Solution
The use of an adjustable color source, such as an RGB LED, with wavelength and intensity control, directed onto treated tape, where a photodiode measures reflected radiation, and a microprocessor analyzes the data to determine the type and concentration of gases by performing spectrum scan analysis and data analysis, including Fast Fourier Transform, to maintain sensitivity across different gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single wavelength LED is used, then sensitivity to a single gas type is improved, but sensitivity to multiple gas types deteriorates
Solution Approach 1:
The patent employs an adjustable color source (such as an RGB LED with independently controllable red, green, and blue channels) that can dynamically change its emission wavelength. By adjusting the intensity ratios of the red, green, and blue LEDs, the system can adaptively optimize sensitivity for different gas types detected on the tape, thus resolving the contradiction between single-gas precision and multi-gas versatility
Solution Approach 2:
The system changes the optical parameters (wavelength and intensity) of the light source to match the absorption characteristics of different gases. The microprocessor controls the adjustable color source to emit at specific wavelengths that maximize sensitivity for the detected gas type, enabling the system to maintain high measurement precision across multiple gas types by dynamically adjusting the light source parameters
2Adaptability or versatility
If wavelength and intensity of light source are adjusted, then sensitivity for multiple gases is improved, but device complexity increases
Solution Approach 1:
The patent uses a single adjustable color source (RGB LED combination) that serves multiple functions: it can detect multiple gas types by adjusting its wavelength and intensity. This multi-functional approach eliminates the need for separate LEDs for each gas type, thereby improving multi-gas sensitivity while actually reducing the overall number of components compared to using multiple fixed-wavelength LEDs
Solution Approach 2:
The microprocessor acts as an intermediary that automatically controls the adjustable color source based on the detection requirements. It manages the complexity of wavelength and intensity adjustment by translating detection needs into appropriate LED drive signals, thus shielding the user from the complexity while enabling sophisticated multi-gas detection capabilities
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 allows for the detection of multiple types of gases without losing sensitivity, enabling accurate identification of gas types and concentrations by adjusting the wavelength and intensity of the light source to optimize sensitivity, thereby improving multi-gas detection capabilities.
Implementation Method 1
The reflection of light from the tape, and any stains thereon, can be measured by a photodiode
Implementation Method 2
The reflection of light from the tape, and any stains thereon, can be measured by a photodiode
Data Source
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AI summary
An apparatus including a treated tape, an adjustable color source, a photodiode, and a processor is provided. The adjustable color source emits a first radiation toward the treated tape and operates at each of a plurality of different target wavelengths in a spectrum. The photodiode measures a second radiation reflected from the treated tape, and the processor analyzes measurements from the photodiode to determine a peak wavelength from the plurality of target wavelengths. Based on the peak wavelength, the processor determines a color and darkness of a color stain on the treated tape. Based on the determined color and darkness of the color stain, the processor also determines a type and concentration of gas to which the treated tape is exposed.