Fluid Diagnostic Device with Translating Calibration Element
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Solution Overview
Problem
Accurate ultraviolet transmittance (UVT) measurements in fluids are challenging due to rapid fluid flow and fouling of equipment, which complicates the determination of fluid suitability for consumption, especially in wastewater monitoring.
Innovation Solution
A diagnostic apparatus with a measurement head, a translating calibration element, and a calibration element actuator, which includes a diagnostic light source and light sensor, and a translating calibration element that can occupy the diagnostic light path to provide calibration readings, reducing fouling through wiper mechanisms and minimizing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional UVT measurement methods are used, then fluid flow can be monitored, but fouling of equipment occurs and measurement accuracy decreases
Solution Approach 1:
The patent employs a translating calibration element that can be dynamically moved into and out of the light path using a actuator mechanism. This dynamic positioning allows the system to switch between measuring the fluid sample and measuring a calibration standard, enabling continuous monitoring while periodically performing calibration to compensate for fouling effects on the measurement windows.
Solution Approach 2:
The system performs calibration measurements periodically using the translating calibration element before or after fluid sample measurements. This preliminary calibration action compensates for any fouling that may have occurred on the measurement windows, ensuring that subsequent fluid measurements remain accurate despite equipment contamination.
2Measurement precision
If calibration is performed frequently to maintain accuracy, then measurement precision improves, but device complexity and operational time increase
Solution Approach 1:
The translating calibration element serves multiple functions: it acts as a calibration standard when positioned in the light path, and its translation mechanism also serves to block the light path during calibration operations. The actuator system that moves the calibration element also controls the measurement/calibration switching, consolidating multiple functions into a single integrated mechanism rather than requiring separate calibration and measurement systems.
Solution Approach 2:
The calibration function is extracted from the main measurement process by using a separate translating calibration element that can be independently positioned. This allows the calibration operation to be separated from continuous fluid measurement, enabling calibration to be performed without interrupting or diverting the fluid flow, thus simplifying the overall system operation.
3Device complexity
If calibration elements are stationary, then device complexity is reduced, but fouling affects calibration accuracy
Solution Approach 1:
The calibration element is designed to be dynamic rather than stationary, translating between a first position for calibration measurements and a second position for fluid sample measurements. This dynamic positioning allows the same physical component to serve both calibration and measurement functions while eliminating the fouling problem that would affect stationary calibration elements.
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
The solution enables accurate and reliable UVT measurements by minimizing fouling, reducing calibration drift, and allowing for real-time, continuous monitoring without diverting the fluid, thus improving the assessment of fluid suitability.
Implementation Method 1
Ultraviolet transmittance (UVT) is a measurement of the amount of light having a certain wavelength, for example 254 nanometers, that passes through a length of a fluid
Implementation Method 2
The translating calibration element is at least partially transparent to light at the diagnostic wavelength λD
Data Source
AI summary
A diagnostic apparatus includes a measurement head, a translating calibration element, and a calibration element actuator. The measurement head includes a diagnostic light source, a light sensor, and a measurement head body. The diagnostic light source operates at a diagnostic wavelength λD and the measurement head body supports the diagnostic light source and the light sensor in a spaced apart relationship across a target fluid passageway to define a diagnostic light path extending from the diagnostic light source to the light sensor. The translating calibration element is partially transparent to light at the diagnostic wavelength λD and the calibration element actuator is structurally configured to move the translating calibration element into and out of the target fluid passageway. A size and geometry of the translating calibration element is such that the translating calibration element occupies a substantial entirety of the diagnostic light path when moved into the target fluid passageway.