Related Manuals for Pasco Scientific OS-9255A
Summary of Contents for Pasco Scientific OS-9255A
- Page 1 012-07137B Instruction Manual and Includes Teacher's Notes Experiment Guide for the Typical Experiment Results PASCO scientific Models OS-9255A thru OS-9258A PRECISION INTERFEROMETER...
-
Page 2: Table Of Contents
012-07137B Precision Interferometer Table of Contents Section Page Copyright, Warranty, and Equipment Return ..........ii-iii Introduction ...................... 1 Equipment ......................2 Theory of Operation ..................4 Michelson Twyman-Green Fabry-Perot Setup and Operation ..................6 Tips on Using the Interferometer ..............9 Sources of Error Troubleshooting Experiments... -
Page 3: Copyright, Warranty, And Equipment Return
AUTHORIZATION FROM PASCO. Limited Warranty When returning equipment for repair, the units must be PASCO scientific warrants the product to be free from packed properly. Carriers will not accept responsibility defects in materials and workmanship for a period of for damage caused by improper packing. To be certain one year from the date of shipment to the customer. -
Page 4: Introduction
012-07137B Precision Interferometer Introduction The OS-9255A Precision Interferometer provides both a Fabry-Perot theoretical and a practical introduction to interferometry. The Fabry-Perot Interferometer is also an important Precise measurements can be made in three modes: contemporary tool, used most often for high resolution spectrometry. -
Page 5: Equipment
• Lens, 18 mm Focal Length • Vacuum Pump with Gauge • Diffuser NOTE: • Fitted Storage Case The OS-9255A Fitted Case also provides storage for Additional Equipment Required – these accessory components. • Laser (OS-9171) • Laser Bench (OS-9172) - Page 6 Lens Adjustable Fitted Case 18 mm Mirror Viewing Screen Beam Splitter Diffuser Movable Mirror (2) Component Compensator Holder Plate OS-9255A Precision Interferometer Lens 18 mm Component Holder Base Lens 48 mm OS-9256A (2) Polarizer Interferometer Accessories Glass Plate Rotating Pointer...
-
Page 7: Theory Of Operation
Precision Interferometer 012-07137B Theory of Operation Interference Theory The Michelson Interferometer A beam of light can be modeled as a wave of oscillating In 1881, 78 years after Young introduced his two-slit electric and magnetic fields. When two or more beams of experiment, A.A. - Page 8 012-07137B Precision Interferometer In this way the original NOTE: Using the Compensator beam of light is split, and portions of the resulting In Figure 1, notice that one beam passes through the beams are brought back glass of the beam-splitter only once, while the other together.
-
Page 9: Setup And Operation
Precision Interferometer 012-07137B mirror is moved toward or away from the fixed mirror, the The Fabry-Perot Interferometer fringe pattern shifts. When the mirror movement is equal In the Fabry-Perot Interferometer, two partial mirrors are to 1/2 of the wavelength of the light source, the new fringe aligned parallel to one another, forming a reflective cavity. - Page 10 Precision Interferometer Component Interferometer holder base Laser beam VIEWING SCREEN MICHELSON, TWYMAN-GREEN VIEWING SCREEN PRECISION MICHELSON, TWYMAN-GREEN INTERFEROME OS-9255A Compensator Viewing screen (optional) Movable mirror Slide the rear of the laser laterally on the Movable Beam alignment bench until Component...
- Page 11 A 48 mm FL convex lens may also be used to Lens Adjustable mirror Movable mirror magnify the projected image of the fringes. 18mm FL VIEWING SCREEN PRECISION MICHELSON, TWYMAN-GREEN INTERFEROMETER OS-9255A VIEWING SCREEN PRECISION MICHELSON, TWYMAN-GREEN INTERFEROMETER OS-9255A Component Lens holder Component...
-
Page 12: Tips On Using The Interferometer
012-07137B Precision Interferometer Tips on Using the Interferometer The slip ring at the base of the micrometer knob adjusts Accurate Fringe-Counting the tension in the dial. Before making a measurement, The following techniques can help you make accurate be sure the tension is adjusted to give you the best pos- measurements. -
Page 13: Sources Of Error
Precision Interferometer 012-07137B Sources of Experimental Error IMPORTANT: If the movable mirror doesn't Backlash— Although PASCO's carefully designed mirror move when you turn the micrometer dial, see movement reduces backlash considerably, every mechani- Micrometer Spacer Replacement in the cal system is susceptible to backlash. However, the effects Maintenance section at the end of this manual. -
Page 14: Experiment 1: Introduction To Interferometry
012-07137B Precision Interferometer Experiment 1: Introduction to Interferometry EQUIPMENT NEEDED: – Basic Interferometer (OS-9255A) Lens Component holder – Laser (OS-9171) 18mm FL – Laser Alignment Bench (OS-9172) VIEWING SCREEN PRECISION – Interferometer Accessories (OS-9256A) MICHELSON, TWYMAN-GREEN INTERFEROMETER OS-9255A Component Holder , (2) Calibrated Polarizers... - Page 15 Precision Interferometer 012-07137B Record d , the distance that the movable mirror moved toward the beam-splitter according to your readings of the micrometer knob. Remember, each small division on the micrometer knob corre- sponds to one µm (10 meters) of mirror movement. Record N, the number of fringe transitions that you counted.
-
Page 16: Experiment 2: The Index Of Refraction Of Air
012-07137B Precision Interferometer Experiment 2: The Index of Refraction of Air EQUIPMENT NEEDED: – Basic Interferometer (OS-9255A) – Laser (OS-9171) – Laser Alignment Bench (OS-9172) – Interferometer Accessories (OS-9256A) Rotational pointer, Vacuum cell, Vacuum pump Introduction In the Michelson interferometer, the characteristics of the... - Page 17 Precision Interferometer 012-07137B Be sure that the air in the vacuum cell is at atmospheric pressure. If you are using the OS-8502 Hand- Held Vacuum Pump, this is accomplished by flipping the vacuum release toggle switch. Record P , the initial reading on the vacuum pump gauge. Slowly pump out the air in the vacuum cell. As you do this, count N, the number of fringe transitions that occur.
-
Page 18: Experiment 3: The Index Of Refraction Of Glass
012-07137B Precision Interferometer Experiment 3: The Index of Refraction of Glass EQUIPMENT NEEDED: – Basic Interferometer (OS-9255A) – Laser (OS-9171) – Laser Alignment Bench (OS-9172) VIEWING SCREEN PRECISION MICHELSON, TWYMAN-GREEN – Interferometer Accessories INTERFEROMETER OS-9255A Rotating Table, Glass Plate Glass plate... - Page 19 Precision Interferometer 012-07137B Data Analysis In principle, the method for calculating the index of refraction is relatively simple. The light passes through a greater length of glass as the plate is rotated. The general steps for measuring the index of refraction in such a case is as follows: 1.
-
Page 20: Suggestions For Additional Experiments
012-07137B Precision Interferometer Suggestions for Additional Experiments Twyman-Green— a. Tape two thin pieces of wire or thread to the surface of the diffuser to form cross-hairs. Twyman-Green operation gives students a quick, qualita- tive look at how interferometry can be used to test optical b. -
Page 21: Maintenance
Precision Interferometer 012-07137B IMPORTANT— The Vacuum Cell is not designed to Fabry-Perot Spectroscopy— be heated. The Fabry-Perot mode is customarily used as a high- Index of Refraction for Gases— resolution spectrometer. Very close spectral lines, as in magnetic splitting, can be resolved much more accurately Measure the indices of refraction for various gases. - Page 22 012-07137B Precision Interferometer Replacement Parts Component Part No. Component Part No. Vacuum Cell 003-05162 Interferometer Base 003-05137 Rotational Pointer 003-05160 Adjustable Mirror 003-03957 Fitted Case 650-05178 Beam-Splitter 003-03956 Viewing Screen 003-05119 Movable Mirror 003-03955 Diffuser 003-03941 Component Holder 003-05161 Polarizer 003-04924 Compensator 003-03958...
-
Page 23: Teacher's Guide
Precision Interferometer 012-07137B Teacher's Guide Experiment 1: Introduction to Interferometry Part I – General Reference to – Analysis (Part II) wavelength The laser we used was unpolarized, and does not seem to change polarization with time. –5 –9 Michelson 1.60 x 10 640.0 x 10 –5 –9... - Page 24 012-07137B Precision Interferometer Experiment 2: The Index of Refraction of Air Reference to – Procedure Answers to – Questions The chamber will be properly aligned when the reflec- Extrapolating from our slope and the known index of tions off the front and back end-plates are aligned with refraction of vacuum, each other and with the main interference pattern.
- Page 25 Precision Interferometer 012-07137B Experiment 3: The Index of Refraction of Glass Reference to – Procedure Notes – General The glass plate must be absolutely perpendicular to the It is often difficult to count large numbers of fringes due to laser for accurate measurement of the index of refrac- eyestrain.
- Page 26 012-07137B Precision Interferometer Technical Support Feedback Contacting Technical Support If you have any comments about the product or manual, Before you call the PASCO Technical Support staff, it please let us know. If you have any suggestions on would be helpful to prepare the following information: alternate experiments or find a problem in the manual, If your problem is with the PASCO apparatus, note: please tell us.
- Page 27 Precision Interferometer 012-07137B ®...
Need help?
Do you have a question about the OS-9255A and is the answer not in the manual?
Questions and answers