Sample Container with Pressure Control for Vacuum XRF Liquid Analysis
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Solution Overview
Problem
Existing X-ray fluorescence (XRF) analyzers face challenges in measuring light elements in liquids due to air absorption of fluorescent X-rays, requiring a vacuum atmosphere which causes liquid evaporation or freezing, necessitating helium gas replacement and complex gas management systems.
Innovation Solution
A sample container with a sealable receptacle, pressure adjusting valve, and analytical film that maintains a controlled pressure within the receptacle, allowing measurements in a vacuum atmosphere without helium gas, using a pressure adjusting valve to keep the receptacle pressure above the boiling point of the liquid and below the film damage threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vacuum atmosphere is created in the sample chamber to enable light element measurement, then measurement precision is improved, but the liquid sample evaporates or freezes causing loss of substance
Solution Approach 1:
The system is divided into two separate chambers: a sample chamber maintained at vacuum for X-ray fluorescence detection, and a sealed pressure-regulated receptacle containing the liquid sample. This segmentation allows each component to operate under optimal conditions - vacuum for measurement precision and controlled pressure for sample stability.
Solution Approach 2:
An analytical film serves as an intermediary between the vacuum environment and the liquid sample. The film transmits X-rays while separating the vacuum chamber from the pressurized sample receptacle, enabling light element detection without direct exposure of the liquid to vacuum conditions.
2Measurement precision
If helium gas is used to replace air in the sample chamber to prevent absorption of fluorescent X-rays, then measurement precision is improved, but device complexity increases due to gas management systems
Solution Approach 1:
The problematic air medium is completely removed from the measurement path by maintaining a vacuum in the sample chamber. This eliminates the need for helium gas replacement systems while still enabling effective X-ray fluorescence detection through the analytical film.
Solution Approach 2:
The mechanical gas replacement system (helium inlet/outlet ports, pressure regulation) is replaced with a vacuum system. This substitution simplifies the device by eliminating complex gas management mechanisms while achieving the same goal of reducing X-ray absorption.
3Loss of substance
If pressure in the receptacle is increased to prevent liquid evaporation, then loss of substance is reduced, but the analytical film may be damaged
Solution Approach 1:
A pressure regulation mechanism with feedback control maintains the receptacle pressure within a safe operating range. The system automatically adjusts pressure to prevent both liquid evaporation and excessive pressure that could damage the analytical film, ensuring optimal conditions for measurement.
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
Enables accurate measurement of light elements in liquids within an XRF analyzer by preventing evaporation and film damage, allowing for high-sensitivity analysis without helium gas replacement.
Implementation Method 1
an analytical film closing off the second opening and transmitting X-rays
Implementation Method 2
the pressure in the first receptacle can be adjusted with the pressure adjusting valve and therefore, within the sample chamber in a vacuum atmosphere, the interior of the first receptacle can be maintained at a pressure higher than the pressure at which the liquid sample boils
Implementation Method 3
An X-ray fluorescence (XRF) analyzer can perform qualitative, quantitative, and other analyses by irradiating a sample with primary X-rays produced from an X-ray tube
Implementation Method 4
detecting with a detector secondary X-rays responsively emanating from the sample
Data Source
AI summary
Provided is a sample container which is for use with an X-ray fluorescence analyzer and which permits measurement of light elements in a liquid. The sample container includes a sealable first receptacle, a pressure adjusting valve for adjusting the pressure in the first receptacle, a second receptacle receiving a liquid sample (S) and having both a first opening and a second opening located inside and outside, respectively, of the first receptacle, and an analytical film closing off the second opening and transmitting X-rays.