1. Main stage
2. Side stage
3. Light source
4. Post holder
5. Beam expander
6. Post holder
7. Post holder
8. Fixed mirror
9. Presetting micrometer
10. Beam splitter
11. Compensator
12. Movable mirror
13. Fine micrometer
14. Post holder
15. Alignment holes
16. Post holder
Fringe image acquired by color camera
Features
Smooth mirror movement
Precise measurements
He-Ne Laser, Sodium-Tungsten Lamp, and Air Chamber Included
Optional VGA Video Camera for Fringe Image Display and Projection
Introduction
The Michelson Interferometer (LEOI-20) is a cornerstone instrument in physics laboratories and plays a vital role in understanding light's wave properties through interference. It produces interference fringes by splitting a beam of monochromatic light into two separate beams. One of these beams strikes a fixed mirror, and the other is directed at a movable mirror. When the beams are reflected and recombine, an interference pattern is formed. The interferometer allows for precise measurements of wavelength, distance, and refractive index, making it a fundamental tool for students learning about wave optics.
Using an optional color camera allows for real-time observation of the interference fringes on a VGA display, projector, or PC, providing dynamic visual feedback during experiments and enhancing learning in both classroom and laboratory settings.
The instruction manual contains comprehensive materials including experimental configurations, principles and step-by-step instructions. Please click Experiment Theory and Contents to find more information about this apparatus.
Using this instrument, the following experiment examples can be conducted:
1. Interference fringe observation
2. Equal-inclination fringe observation
3. Equal-thickness fringe observation
4. White-light fringe observation
5. Wavelength measurement of the Sodium D-lines
6. Wavelength separation measurement of the Sodium D-lines
7. Measurement of the refractive index of air
8. Interference fringe acquisition by color camera for VGA display or projector or PC (optional)
Specifications
| Description | Specifications |
| Flatness of Beam Splitter and Compensator | 0.1 λ |
| Coarse Travel of Mirror | 10 mm |
| Fine Travel of Mirror | 0.25 mm |
| Fine Travel Resolution | 0.5 μm |
| Weight | Approx. 20 kg |
| Dimension | 350×350×245 mm |
| Sodium-Tungsten Lamp | Sodium lamp: 20 W; Tungsten lamp: 30 W adjustable |
| He-Ne Laser | Power: >2.0 mW; Wavelength: 632.8 nm |
| Air Chamber, Pump with Gauge | Chamber length: 80 mm; Pressure range: 0-40 kPa |
Camera with VGA Port (Optional) | Sensor size: 1/4" |
| Resolution: 1280 × 1024 | |
| Pixel size: 2.8 μm × 2.8 μm | |
| Bit: 8 | |
| Output format: VGA | |
| Length measurement on screen with crosshairs | |
| Function setting & operation: via keypad and menu |
Part List
| Description | Qty |
| Interferometer Main Frame | 1 |
| Ground Glass Screen | 1 |
| Alignment Aperture | 1 |
| Sodium-Tungsten Lamp with Power Supply | 1 set |
| He-Ne Laser with Power Supply | 1 set |
| Air Chamber with Gauge | 1 set |
| Manual Counter | 1 |
| CMOS VGA Camera with Mount & Keypad (Optional) | 1 set |
1. Main stage
2. Side stage
3. Light source
4. Post holder
5. Beam expander
6. Post holder
7. Post holder
8. Fixed mirror
9. Presetting micrometer
10. Beam splitter
11. Compensator
12. Movable mirror
13. Fine micrometer
14. Post holder
15. Alignment holes
16. Post holder
Fringe image acquired by color camera
