Optical Detector Condenser Lens System Temperature Compensation
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Solution Overview
Problem
Optical detectors face challenges in maintaining high detection performance when used in environments with temperature changes, as the shift in peak wavelength of laser light due to temperature dependence leads to fluctuations in optical power and chromatic aberration, affecting light collection and detection accuracy.
Innovation Solution
The optical detector incorporates a condenser lens system with a temperature change factor and chromatic aberration factor, where the optical power of each lens is adjusted to balance these factors within a specific wavelength range, ensuring consistent light collection and focus on the detection element despite temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single optical lens is used to collect reflected light, then the device structure is simple, but detection performance deteriorates under temperature changes due to chromatic aberration and optical power fluctuations
Solution Approach 1:
The single optical lens is divided into a plurality of lenses arranged in sequence along the optical axis. Each lens has a specific optical power and is made of optical material with specific temperature change factor and chromatic aberration factor. This segmentation allows the lens system to balance temperature change factor and chromatic aberration factor, maintaining detection performance under temperature changes while avoiding the complexity of overly complex lens systems.
2Reliability
If the optical power of lenses is adjusted to balance temperature change factor and chromatic aberration factor, then detection performance is maintained under temperature changes, but lens design and manufacturing become more complex
Solution Approach 1:
The optical power of each lens is adjusted based on specific parameters including the temperature change factor and chromatic aberration factor of the optical material. By changing these optical parameters and balancing them across multiple lenses, the system maintains detection performance under temperature changes. The adjustment follows specific relationships between temperature changes and peak wavelength shifts, making the manufacturing process systematic rather than arbitrary.
3Adaptability or versatility
If laser light peak wavelength shifts with temperature, then the light source adapts to temperature changes, but chromatic aberration increases and reduces detection accuracy
Solution Approach 1:
The temperature-induced peak wavelength shift, which initially causes chromatic aberration and reduces detection accuracy, is converted into a beneficial effect. By designing the lens system with specific optical powers and using optical materials with appropriate temperature change factors and chromatic aberration factors, the system balances these effects across the wavelength range. This allows the lens system to maintain focused light collection on the detection element even as the wavelength shifts, turning the temperature dependency into an adaptive feature rather than a defect.
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 maintains high detection performance by efficiently collecting reflected light on the detection element, even with temperature fluctuations, thereby enhancing the sensitivity and accuracy of the detection process.
Implementation Method 1
a condenser lens system that collects the reflected light to the detection element. The condenser lens system has a plurality of lenses made of optical material and having a positive optical power as a whole
Implementation Method 2
The condenser lens system has a temperature change factor in the optical material that increases the optical power as a whole of the lens system at a high temperature than at a low temperature
Implementation Method 3
a chromatic aberration factor that decreases the optical power as a whole of the lens system at a long wavelength than at a short wavelength
Data Source
AI summary
An optical detector includes a light emitting unit and a light receiving unit that receives a reflected light reflected by a measurement object. The light receiving unit has a detection element and a condenser lens system that collects the reflected light to the detection element. The condenser lens system has a plurality of lenses. The condenser lens system has a temperature change factor that increases the optical power at a high temperature than at a low temperature, and a chromatic aberration factor that decreases the optical power at a long wavelength than at a short wavelength. The optical power of each of the plurality of lenses is adjusted based on a correspondence between a change in temperature and a shift amount of the peak wavelength, so that the chromatic aberration factor balances with the temperature change factor within a predetermined wavelength range.