Physics Lab Equipment

LETI-30 Thermal Expansion-1.jpg


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. Sample

12. Temperature sensor

13. Quartz base


LETI-30 Thermal Expansion Experiment - Optical Interference

LETI-30 Thermal Expansion Experiment - Optical Interference

Features

  • Compact structure

  • Various types of samples

  • 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 sample under test. Both ends of the specimen in the oven are isolated from the rest of the sample arm with quartz so that the thermal expansion of the sample 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.


Specifications

DescriptionSpecifications
He-Ne Laser1.0 mW@632.8 nm
SamplesCopper, aluminum, and steel
Sample Length150 mm
Heating Range18 °C ~ 60 °C, with temperature-control function
Temperature Measurement Accuracy0.1 °C
Display Value Error± 1%
Power Consumption50 W

Error of Linear Expansion Coefficient

< 3%


Part List

DescriptionQty
Thermal Expansion Experiment Unit1
He-Ne Laser (LLL-2)1
Plane Mirror2
Power Cable1
Lift Tool1
Manual Counter1
Aluminum Alloy Sample1
Copper Alloy Sample1
Steel Sample1


LETI-30 Thermal Expansion-1.jpg


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. Sample

12. Temperature sensor

13. Quartz base


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