UV-VIS Detector Optical Reference for HPLC Absorbance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing UV-VIS spectrophotometers in HPLC systems face challenges in accurately measuring sample absorbance due to stray light and light intensity fluctuations, which are often addressed by using a beamsplitter that increases system cost and size and reduces measurement sensitivity.
Innovation Solution
A UV-VIS detector unit configuration that eliminates the need for a beamsplitter by using a second light source as a reference, aligned differently from the primary light source and sample path, allowing all primary light to reach the sample and correlating intensity fluctuations between the two light sources for accurate absorbance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a beamsplitter is used to divert light to a reference detector, then light intensity fluctuations can be compensated, but system size and cost increase and measurement sensitivity decreases
Solution Approach 1:
The patent removes the beamsplitter component from the optical system, extracting the problematic element that caused increased system complexity and reduced sensitivity. Instead of diverting light through a beamsplitter, the system uses a second light source positioned to provide reference light directly to the reference detector without interfering with the primary measurement beam path.
Solution Approach 2:
The patent introduces a second light source as an intermediary element to provide reference light. This mediator light source allows the reference detector to monitor light intensity fluctuations independently, without requiring the beamsplitter to divert the primary measurement beam, thus maintaining measurement sensitivity while achieving compensation.
2Measurement precision
If a beamsplitter is used to divert light to a reference detector, then light intensity fluctuations can be compensated, but measurement sensitivity decreases
Solution Approach 1:
The patent removes the beamsplitter that was diverting light from the sample path, ensuring that substantially all light from the primary light source reaches the sample. This extraction of the beamsplitter eliminates the reduction in illumination intensity reaching the sample while maintaining the ability to compensate for light source fluctuations through the separate reference light source.
Solution Approach 2:
The second light source acts as an intermediary that provides reference light independently of the primary measurement beam. This allows the reference detector to monitor intensity fluctuations without interfering with the primary beam's intensity, thus maintaining measurement sensitivity while achieving compensation through the mediator reference source.
3Measurement precision
If a beamsplitter is used to divert light, then a reference signal can be obtained, but system cost increases
Solution Approach 1:
The patent removes the beamsplitter component, which is typically an expensive optical element requiring precise alignment and coating. By extracting this component and replacing it with a second light source and reference detector arrangement, the system achieves the same compensation function at lower cost and with simpler manufacturing requirements.
Solution Approach 2:
The second light source serves as a cost-effective intermediary solution compared to using a beamsplitter. This mediator approach uses simpler, more economical components (light source and detector) rather than expensive beam-diverting optics, reducing system cost while maintaining the ability to obtain reference signals for accurate absorbance measurements.
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 reduces system size and cost while maintaining or improving sensitivity by directly utilizing back-scattered light as a reference beam, effectively correcting for light intensity fluctuations and enhancing the accuracy of absorbance measurements.
Implementation Method 1
UV-VIS spectrophotometers quantitatively measure the light reflection or transmission properties of a material as a function of wavelength
Implementation Method 2
a second light source may be provided as a reference light source, thus allowing substantially all of the light from the primary light source to be directed to the sample
Implementation Method 3
directly utilizing back-scattered light as a reference beam, effectively correcting for light intensity fluctuations
Data Source
AI summary
Systems and methods are provided for a UV-VIS spectrophotometer, such as a UV-VIS detector unit included in a high-performance liquid chromatography system. In one example, a system for the UV-VIS detector unit may include a first light source, a signal detector, a flow path positioned intermediate the first light source and the signal detector, a second light source, and a reference detector. The first light source, the signal detector, and the flow path may be aligned along a first axis, and the second light source and the reference detector may be aligned along a second axis, different than the first axis.