Subscribe to Our Youtube Channel
Related Manuals for Pasco Scientific OS-8501
Summary of Contents for Pasco Scientific OS-8501
- Page 1 012-02675 Instruction Manual and 10/91 Experiment Guide for Revision B the PASCO scientific Model OS-8501 Interferometer Copyright © February 1986 $10.00...
-
Page 3: Table Of Contents
Interferometer 012-02675B Table of Contents Section Page Copyright, Warranty, and Equipment Return ........ii Introduction....................1 Equipment ....................1 Equipment included: Additional Equipment Needed: Additional Equipment Recommended: Theory of Operation .................2 Interference Theory The Michelson Interferometer Operation The Interferometer ..................4 The Movable Mirror .................. -
Page 4: Copyright, Warranty And Equipment Return
Limited Warranty When returning equipment for repair, the units must be packed properly. Carriers will not accept PASCO scientific warrants this product to be free from responsibility for damage caused by improper defects in materials and workmanship for a period of one year from the date of shipment to the customer. -
Page 5: Introduction
012-02675B Interferometer Introduction The PASCO scientific Model OS-8501 Michelson Interferometer is a precision instru- ment capable of measuring the wavelength of visible, monochromatic light with an accuracy of better than 5%. With the included vacuum chamber, it can also be used for precise measurements of the index of air refraction. -
Page 6: Theory Of Operation
Interferometer 012-02675B Theory of Operation Interference Theory The Michelson Interferometer A beam of light can be modeled as a wave of oscillat- In 1881, some 78 years after Young introduced his ing electric and magnetic fields. When two beams of two-slit experiment, A.A. - Page 7 012-02675B Interferometer In this way the original beam of light splits, and Since the two interfering beams of light were split portions of the resulting beams are brought back from the same initial beam, they were initially in together. The beams are from the same source and phase.
-
Page 8: Operation
Interferometer 012-02675B Operation The Interferometer M 2 (MOVABLE MIRROR) The Michelson Interferometer is shown in BEAM SPLITTER Figure 3. The alignment of the beam- splitter and the movable mirror, M , is easily adjusted by loosening the thumb- screws that attach them to the interferom- eter. -
Page 9: Aligning The Interferometer
NOTE: This alignment procedure is for laser (see Figure 6). You will see two sets of laser those using a PASCO scientific Optics Bench. If spots on the viewing screen, corresponding to the you are not using an Optics Bench, tape a two paths that the beam takes in reaching the straightedge to a flat level surface. - Page 10 Interferometer 012-02675B VIEWING SCREEN Adjust the Beam- Splitter and M1 to superimpose the two sets of laser spots on the viewing screen. 45° LASER M 1 ALIGNMENT SCREWS Figure 6 ALIGNING THE LASER SPOTS VIEWING SCREEN LENS HOLDER LENS, 18 mm FOCAL LENGTH LASER M 1 ALIGNMENT SCREWS...
-
Page 11: Exp 1: Measuring The Wavelength Of Light
012-02675B Interferometer Exp 1: Measuring the Wavelength of Light Theory In many scientific and industrial uses of interferometers, a light source of a known wave- length is used to measure incredibly small displacements - about 10 meters. However, if you know the distance of mirror movement, you can use the interferometer to measure the wavelength of a light source. -
Page 12: Exp 2: Measuring The Index Of Refraction For Air
Interferometer 012-02675B Exp 2: Measuring the Index of Refraction for Air Theory For light of a specific frequency, the wavelength λ varies according to the formula: λ = λ where λ is the wavelength of the light in a vacuum, and n is the index of refraction for the material in which the light is propagating. - Page 13 012-02675B Interferometer VIEWING SCREEN LASER VACUUM CHAMBER AIR HOSE VACUUM PUMP VACUUM CHAMBER MODEL OS-8502 (front view) VACUUM RELEASE TOGGLE SWITCH INTERFEROMETER BANANA PLUG BASE Figure 9 EXPERIMENTAL SETUP method you find to be easier for controlling the air flow.) Record P , the initial reading on the vacuum pump gauge.
- Page 14 Interferometer 012-02675B Analyzing Your Data As the laser beam passes back and forth between the beam-splitter and the fixed mirror, it passes twice through the vacuum chamber. Outside the chamber the optical path-lengths of the two interferometer beams do not change throughout the experiment. Inside the chamber, however, the wavelength of the light gets longer as the pressure is reduced.
-
Page 15: Appendix
Besides cleaning the mirrors, no other maintenance is Beam-Splitter assembly 003-02672 required. If the mylar strip gets damaged, or a severe shock causes the interferometer to lose its alignment, Movable mirror assembly 003-02673 return the unit to PASCO scientific for repair. Component Holder 648-02696 scientific... -
Page 16: Inteferometry With A Spectral Light Source
Interferometer 012-02675B To use the interferometer with a spectral or other Inteferometry with a Spectral Light Source monochromatic light source: Although the Michelson Interferometer works best Tape two thin pieces of wire or thread to the sur- with a laser light source, interferometry measurements face of the diffuser to form cross-hairs. - Page 17 Technical Support Contacting Technical Support Feedback Before you call the PASCO Technical Support staff, If you have any comments about the product or it would be helpful to prepare the following infor- manual, please let us know. If you have any sugges- mation: tions on alternate experiments or find a problem in the manual, please tell us.
Need help?
Do you have a question about the OS-8501 and is the answer not in the manual?
Questions and answers