Open-Air X-Ray Diffractometer Using Substrate-Based Temperature Sensing
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Solution Overview
Problem
Conventional X-ray diffractometers require expensive vacuum systems and temperature sensors/controllers, making them costly and complex, limiting accessibility and accuracy in studying material phase transitions under varying temperature conditions.
Innovation Solution
An X-ray diffractometer operating at atmospheric pressure, using liquid nitrogen coolant streams to control temperature without vacuum systems or temperature sensors, determining sample temperature through diffraction data of a substrate with predictable thermal expansion behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional X-ray diffractometers use vacuum systems and temperature sensors/controllers, then temperature control precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent removes the vacuum system from the X-ray diffractometer, operating instead in atmospheric conditions. This extraction of the vacuum component simplifies the device structure while maintaining measurement capability through alternative temperature determination methods using substrate diffraction data and thermal expansion coefficients.
Solution Approach 2:
The substrate serves multiple functions: it provides mechanical support for the thin film sample and simultaneously acts as a temperature sensor through its predictable thermal expansion behavior. By measuring diffraction patterns of the substrate and applying known thermal expansion coefficients, the system determines sample temperature without dedicated temperature sensors, reducing device complexity.
2Stability of the object's composition
If conventional X-ray diffractometers use vacuum systems and temperature controllers, then temperature stability is improved, but cost increases
Solution Approach 1:
The patent eliminates expensive vacuum systems and dedicated temperature controllers from the diffractometer design. The system achieves temperature stability through atmospheric operation combined with computational determination of temperature from substrate diffraction data, significantly reducing manufacturing cost while maintaining measurement accuracy.
Solution Approach 2:
The substrate automatically provides temperature information through its inherent thermal expansion properties. The system uses the substrate's own physical response to temperature changes (measurable via diffraction) to self-determine temperature, eliminating the need for separate temperature sensing and control hardware.
3Measurement precision
If conventional X-ray diffractometers use temperature sensors and controllers, then temperature measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The substrate is utilized for dual purposes: structural support and temperature measurement. By measuring the substrate's diffraction pattern and applying its known thermal expansion coefficient, the system accurately determines temperature without requiring separate temperature sensors, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The patent replaces mechanical temperature sensing systems with a computational approach. Instead of using physical temperature sensors that require calibration and maintenance, the system substitutes a method based on measuring substrate lattice parameter changes via diffraction and calculating temperature from these changes using known thermal expansion coefficients.
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
Provides accurate and cost-effective analysis of thermal behaviors and phase transitions in thin films, simplifying setup and reducing complexity by eliminating the need for vacuum systems and temperature controllers.
Implementation Method 1
cooling a sample by delivering liquid nitrogen via a pipe to a sample stage of an X-ray diffractometer. The liquid nitrogen is discharged from the pipe to form a coolant stream
Implementation Method 2
The thermal behavior of the substrate includes thermal expansion, thermal contraction or both
Implementation Method 3
X-ray diffraction is a widely used technique for analyzing these changes because it allows researchers to determine the crystal structures of various materials accurately
Data Source
AI summary
A method of X-ray characterization includes cooling a sample by delivering liquid nitrogen via a pipe to a sample stage of the X-ray diffractometer. The liquid nitrogen is discharged from the pipe to form a coolant stream. The pipe has an outlet to orient a flow of the coolant stream at the sample on the sample stage. The sample includes a substrate and a thin film formed on the substrate. During the cooling, diffraction data of the thin film and diffraction data of the substrate are collected by a detector of the X-ray diffractometer. A temperature of the thin film is determined based on the diffraction data of the substrate and thermal behavior of the substrate as a function of temperature. The thermal behavior of the substrate includes thermal expansion, thermal contraction or both.