UV Optical System Using Single Lenses to Reduce Transmission Loss
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Solution Overview
Problem
Conventional ultraviolet optical systems suffer from high transmission loss, making it difficult to accurately measure the light distribution of ultraviolet light sources due to absorption and reflection issues, particularly when using cemented lenses and materials that absorb ultraviolet light.
Innovation Solution
An ultraviolet optical system comprising an objective lens group and an imaging lens group with no cemented surfaces, using only single lenses that transmit ultraviolet light at wavelengths of 300 nm or shorter, along with a sensor sensitive to ultraviolet light, to minimize absorption and reflection losses and capture ultraviolet light distribution accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional optical systems with cemented lenses are used for ultraviolet light measurement, then the system structure is simplified and easier to manufacture, but transmission loss increases and measurement accuracy deteriorates
Solution Approach 1:
The patent divides the optical system into separate objective lens and imaging lens, each consisting of multiple single lenses rather than cemented compound lenses. This segmentation eliminates cemented interfaces that cause ultraviolet absorption and reflection, thereby reducing transmission loss while maintaining manufacturability through standardized single lens components
Solution Approach 2:
The patent introduces air gaps between lens elements as an intermediary medium instead of using cement. This air intermediary eliminates the harmful cemented surfaces that absorb and reflect ultraviolet light, allowing ultraviolet transmission while maintaining proper optical spacing and alignment through precision mounting structures
2Ease of manufacture
If conventional optical materials are used in ultraviolet optical systems, then material selection is easier and cost is reduced, but transmission loss increases due to absorption
Solution Approach 1:
The patent changes the material parameter selection criteria to prioritize ultraviolet transmission characteristics. By selecting optical materials specifically designed for ultraviolet wavelengths (such as fused silica, quartz, or fluorite) rather than conventional visible-light materials, the system achieves low transmission loss while maintaining ease of manufacture through availability of these specialized materials
3Stability of the object's composition
If cemented lens surfaces are used in the optical system, then lens alignment is easier to maintain, but reflection and absorption increase reducing optical efficiency
Solution Approach 1:
The patent uses air as an intermediary medium between lens elements instead of cement, eliminating the cemented surfaces that cause reflection and absorption. Precision mounting structures with adjustable alignment mechanisms maintain lens alignment stability in the air gaps, achieving both alignment stability and high optical efficiency simultaneously
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 configuration enables high-accuracy measurement of ultraviolet light distribution by reducing transmission loss and improving optical efficiency, allowing for precise capture of ultraviolet light from ultraviolet light sources across various angles.
Implementation Method 1
an objective lens group that captures ultraviolet light for each angle from an ultraviolet light source and forms an intermediate image
Implementation Method 2
an imaging lens group that re-images the intermediate image
Implementation Method 3
a sensor that converts an optical image formed on a light receiving sensor surface into an electrical signal
Data Source
AI summary
An ultraviolet optical system includes an objective lens group that captures ultraviolet light for each angle from an ultraviolet light source and forms an intermediate image, and an imaging lens group that re-images the intermediate image. Neither the objective lens group nor the imaging lens group has a cemented surface, and all lenses included in the objective lens group and in the imaging lens group are single lenses that transmit ultraviolet light having a wavelength of 300 nm or shorter. A light distribution measuring apparatus includes the ultraviolet optical system and a sensor, and outputs light distribution of the ultraviolet light source by using a signal obtained by the sensor. The ultraviolet optical system is positioned such that the intermediate image is re-imaged on a light receiving sensor surface, and the sensor has light receiving sensitivity to ultraviolet light having a wavelength of 300 nm or shorter.