1. Digital temperature controller
2. Viewing screen
3. Beam splitter
4. He-Ne laser
5. Beam expander
6. Fixed mirror
7. Folding mirror
8. Movable mirror
9. Quartz tube
10. Oven
11. Specimen
12. Temperature sensor
13. Quartz base
Features
Compact structure
Various types of specimens
Low power consumption
High accuracy
Introduction
This apparatus employs a Michelson interferometer and an oven, together with a temperature sensor for precise temperature control of the specimen under test. Both ends of the specimen in the oven are isolated from the rest of the specimen arm with quartz so that the thermal expansion of the specimen arm is dominated by the specimen. Displacement of the specimen due to thermal expansion is measured in terms of the number of interference fringes passed by visual counting. Therefore, the thermal expansion of the material under test can be calculated accurately on the order of a half wavelength of the He-Ne laser.
The instruction manual contains experimental configurations, principles and step-by-step instructions.Please click Experiment Theory and Contents to find more information about this apparatus.
Specifications
| Description | Specifications |
| He-Ne Laser | 1.0 mW@632.8 nm |
| Specimens | Copper, aluminum, and steel |
| Specimen Length | 150 mm |
| Heating Range | 18 °C ~ 60 °C, with temperature-control function |
| Measurement Accuracy of Temperature Change | 0.1 °C |
| Display Value Error | ± 1% |
| Power Consumption | 50 W |
Error of Linear Expansion Coefficient | < 3% |
Part List
| Description | Qty |
| Thermal Expansion Experiment Unit | 1 |
| He-Ne Laser (LLL-2-A) | 1 |
| Plane Mirror | 2 |
| Power Cable | 1 |
| Lift Tool | 1 |
| Manual Counter | 1 |
| Aluminum Alloy Specimen | 1 |
| Copper Alloy Specimen | 1 |
| Steel Specimen | 1 |
1. Digital temperature controller
2. Viewing screen
3. Beam splitter
4. He-Ne laser
5. Beam expander
6. Fixed mirror
7. Folding mirror
8. Movable mirror
9. Quartz tube
10. Oven
11. Specimen
12. Temperature sensor
13. Quartz base
