ASTM E289 Linear Thermal Expansion Testing for Rigid Solids by Interferometry
ASTM E289 – 04 test method provides a measure to determine the linear thermal expansion of rigid solids at test temperature and under the stresses imposed by instrumentation. The Michelson and Fizeau interferometers determine dimensional length change absolutely of the sample.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
ASTM E289 Linear Thermal Expansion Overview
ASTM E289 is a high-precision standard test method used to determine the coefficient of linear thermal expansion (CTE) of rigid solids. ASTM E289 uses interferometry, whereas other techniques (such as ASTM E228) employ push-rod dilatometers.
This method uses light interference patterns, typically from a laser source, to quantify minute variations in a specimen’s length under precisely controlled temperature fluctuations. It is regarded as one of the most sensitive and precise techniques because it detects length changes by measuring changes in the wavelength of light. It is frequently used for materials with extremely low thermal expansion or when high precision is required.
Scope, Applications, and Benefits
Scope
ASTM E289-04 focuses on measuring changes in length of rigid solids as a function of temperature using optical interference methods. It ensures high-accuracy determination of thermal expansion.
The test evaluates:
- Linear thermal expansion
- Coefficient of thermal expansion (CTE)
- Dimensional stability
- Temperature-dependent behavior
- Material performance
Applications
- Characterization of low-expansion and ultra-stable materials
- Development and calibration of reference materials and standards
- Precision optics, metrology, and interferometric systems
- Aerospace and space structures requiring dimensional stability
- Semiconductor, electronics, and photonics materials evaluation
Benefits
- Provides extremely high accuracy and resolution in thermal expansion measurement
- Enables the detection of very small dimensional changes
- Suitable for establishing reference and calibration data
- Minimizes mechanical contact errors through optical measurement
- Ideal for research, standards development, and precision engineering
ASTM E289 Linear Thermal Expansion Test Process
Specimen Preparation
Prepare a rigid solid specimen with optically flat, parallel, and reflective surfaces. Clean to remove contaminants.
1Instrument Setup
Set up the interferometer, optical system, and temperature-controlled chamber as per calibration requirements.
2Reference Alignment
Align the specimen within the interferometer optical path and establish the initial reference fringe pattern.
3Calculation
Calculate linear thermal expansion or coefficient of thermal expansion using recorded interferometric data.
4ASTM E289 Linear Thermal Expansion Technical Specifications
| Parameter | Details |
|---|---|
| Test Method | Optical interferometry |
| Specimen Geometry | Parallel, flat-faced specimen suitable for interferometric measurement |
| Measurement Resolution | Sub-micrometer to nanometer range (interferometry dependent) |
| Length Change Detection | Fringe shift measurement |
| Environmental Conditions | Vibration-free, optically stable environment |
| Output Data | Length change vs. temperature; calculation |
Instrumentation Used for Testing
- Optical interferometer system
- Precision laser or monochromatic light source
- Temperature-controlled furnace or heating stage
- High-resolution displacement measurement system
- Specimen holder and alignment fixtures
- Temperature measurement and control system
- Data acquisition and analysis software
Results and Deliverables
- Linear expansion data
- Coefficient of thermal expansion (CTE)
- Temperature vs expansion curve
- Test condition summary
- ASTM compliance report
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Frequently Asked Questions
ASTM E289-04 is a standard test method used to determine linear thermal expansion of rigid solids using interferometry for precise measurement of dimensional changes with temperature.
ASTM E289-04 is important because thermal expansion affects dimensional stability, making accurate measurement essential for materials used in precision engineering, aerospace, and structural applications.
ASTM E289-04 uses interferometry to measure minute changes in specimen length as temperature varies, providing high-precision expansion data.
ASTM E289-04 requires an interferometer, temperature-controlled chamber, and precise measurement systems for accurate testing.
ASTM E289-04 results are reported as coefficient of linear thermal expansion, indicating dimensional change per unit temperature.
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