UV Radiometer Crystal Plates Uniform Response
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Solution Overview
Problem
UV radiometers face non-uniformity issues due to varying fluorescent response across crystal converting plates, leading to inaccurate measurements of UV radiation beam power, as the response gradients are not always aligned with the crystal growth direction and can vary significantly across the plate.
Innovation Solution
The use of multiple crystal converting plates with varying fluorescent responses, selected and oriented to provide a normalized net complementary response over the incident beam area, with one plate potentially reversed relative to the other to offset response gradients, ensuring uniform measurement across the beam incident area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single crystal converting plate is used, then the device complexity is low, but the measurement precision deteriorates due to non-uniform fluorescent response across the plate
Solution Approach 1:
The single crystal converting plate is divided into multiple smaller converting plates (first converting plate and second converting plate). Each plate has a smaller area with more uniform fluorescent response characteristics. By segmenting the large plate into smaller units, the non-uniformity problem is reduced while maintaining the overall converting function.
Solution Approach 2:
Multiple crystal converting plates are combined in the optical path to work together. The first converting plate and second converting plate are positioned sequentially, and their fluorescent responses are merged by the photodiode array to produce a composite signal that compensates for individual plate non-uniformities.
2Measurement precision
If multiple crystal converting plates are used to normalize response, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
Each crystal converting plate is designed with specific local characteristics - the first converting plate and second converting plate have different fluorescent response distributions across their surfaces. By selecting plates with complementary local quality patterns, the non-uniformities cancel out when the plates are combined in the optical path.
Solution Approach 2:
The invention changes the spatial distribution parameter of fluorescent response by using multiple plates with different orientation or positioning. The plates are arranged so that their individual response gradients complement each other, transforming the overall response uniformity parameter through geometric arrangement rather than material modification.
3Stability of the object's composition
If crystal converting plates are cut perpendicular to growth direction, then the response uniformity improves, but the adaptability deteriorates for applications requiring specific orientations
Solution Approach 1:
The system achieves universal adaptability by combining multiple converting plates that can be oriented in different directions. The first converting plate and second converting plate can be positioned at various orientations relative to each other, allowing the system to accommodate different application requirements while maintaining response uniformity through the complementary combination effect.
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 results in a UV radiometer that provides a substantially uniform and accurate measurement of UV radiation beam power, independent of the beam's incidence position, by combining the responses of multiple plates to achieve a linear output signal across the entire incident area.
Implementation Method 1
a plate of material that converts the UV radiation to visible fluorescent radiation in response to and in proportion to the power of the beam of UV radiation
Data Source
AI summary
The fluorescent response of a UV radiometer to a UV beam is normalized over an entrance aperture area by using a plurality, preferably two, converting plates. The fluorescent response of at least two and preferably a plurality of crystal converting plates is ascertained. Crystal converting plates having complementary responses are selected and placed adjacently in the entrance aperture area such that an incident UV beam will cause a net complementary fluorescent response from the combined first and second crystal converting plates that is less varying over the entrance aperture area than the respective fluorescent responses of the individual first and second crystal converting plates.