THORLABS EDU-SPEB1 User Manual
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THORLABS EDU-SPEB1 User Manual

Advanced spectrometer kit
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EDU-SPEB1
EDU-SPEB1/M
Advanced Spectrometer Kit
User Guide

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Summary of Contents for THORLABS EDU-SPEB1

  • Page 1 EDU-SPEB1 EDU-SPEB1/M Advanced Spectrometer Kit User Guide...

  • Page 2: Table Of Contents

    Teaching Tips and Experiments........21     6.1.  Exercise 1: Wavelength Measurement of Three Lines in  the Mercury Spectrum .......... 21  6.2.  Exercise 2: Measuring the Index of Refraction of the  Prism Using a Known Spectral Line  ....... 23  Chapter 7 Regulatory ..............25     7.1.  Waste Treatment is Your Own Responsibility .... 25  7.2.  Ecological Background .......... 25  Chapter 8 Thorlabs Worldwide Contacts ........26     Page 1 MTN002263-D02 Rev C, August 26, 2015...

  • Page 3: Chapter 1 Warning Symbol Definitions

    EDU-SPEB1 & EDU-SPEB1/M Chapter 1: Warning Symbol Definitions Chapter 1 Warning Symbol Definitions Below is a list of warning symbols you may encounter in this manual or on your device. Symbol Description Direct Current Alternating Current Both Direct and Alternating Current...

  • Page 4: Chapter 2 Safety

    Advanced Spectrometer Kit Chapter 2 Safety CAUTION Optical gratings can be easily damaged by moisture, fingerprints, aerosols, or the slightest contact with any abrasive material. Gratings should only be handled when necessary and always held by the sides. Latex gloves or a similar protective covering should be worn to prevent oil from fingers from reaching the grating surface.

  • Page 5: Chapter 3 Introduction

    EDU-SPEB1 & EDU-SPEB1/M Chapter 3: Introduction Chapter 3 Introduction Optical spectroscopy has made a major contribution to the development of today's concept of atomic and molecular structure and is indispensable as an analysis procedure in research and industry. Astronomers can analyze the composition of distant stars and environmental analysts can optically measure the composition of exhaust gases without having to take samples.

  • Page 6: Chapter 4 Setup

    Advanced Spectrometer Kit Chapter 4 Setup 4.1. Components and Parts List In cases where the metric and imperial kits contain parts with different item numbers, metric part numbers and measurements are indicated by parentheses unless otherwise noted. 1 x LEDWE-15 Epoxy Encased White LED, Package of 5 2 x ACL2520U...
  • Page 7 EDU-SPEB1 & EDU-SPEB1/M Chapter 4: Setup 1 x GR25-0605 1 x PS858 2 x CH1A 600 lines/mm Reflective Equilateral Dispersing Grating Grating Mount Prism 1 x PM3(/M) 1 x KM100PM(/M) Clamping Arm for Prism 1 x EDU-VS1(/M) Kinematic Prism Mount...
  • Page 8 Advanced Spectrometer Kit 6 x BA1(/M) 4 x BA2(/M) Post Holder Base, Post Holder Base, 1x TPS5 2" x 3" x 3/8" (50 mm 1" x 3" x 3/8" (25 mm x Laser Safety Screen, x 75 mm x 10 mm) 75 mm x 10 mm) 12"...

  • Page 9: Component Assembly

    EDU-SPEB1 & EDU-SPEB1/M Chapter 4: Setup 4.2. Component Assembly First, mount all of the lenses in the LMR1(/M) and FMP1(/M) mounts as specified below and screw each mount to a Ø12.7 mm post. Next, place each post into a PH3 (PH75/M) post holder and attach a BA1(/M) post holder base.
  • Page 10 Advanced Spectrometer Kit Figure 2 : Adjustable Slit VA100(/M) (a) and LEDMF LED Mount (b) on Ø1/2” Posts Figure 3 : Grating in CH1A Mount (a), and Prism in KM100PM(/M) Mount (b), both on Ø1/2” Posts Page 9 MTN002263-D02 Rev C, August 26, 2015...

  • Page 11: Led Wiring

    EDU-SPEB1 & EDU-SPEB1/M Chapter 4: Setup Mounting the KM100PM(/M) or the CH1A on a Post Instead of a threaded hole for mounting, the KM100PM(/M) and the CH1A each contain a counterbored hole. To post mount these parts, first remove the setscrew from the post that you are using.

  • Page 12: Prism Spectrometer Setup

    Advanced Spectrometer Kit lens). As the light sources used usually are not ideal point light sources, you often see a small image of the light source in this focus point (e.g. coil filament, LED-chip, Hg-tubes). This can be useful for focusing. 4 cm 5-6 cm 5-6 cm...
  • Page 13 EDU-SPEB1 & EDU-SPEB1/M Chapter 4: Setup 10 - 15 cm 10 - 15 cm Figure 5 : Beam Path from Slit to Prism to Screen To obtain an optimum image, change the slit width. The further the slit is opened, the brighter/more intense the image becomes, and the tighter it is closed, the sharper the image becomes.

  • Page 14: Grating Spectrometer Setup

    Advanced Spectrometer Kit Figure 6 : Prism-Based Spectrometer Complete Beam Path 4.3.3. Grating Spectrometer Setup The grating-based spectrometer setup is the same up to the f = 100 mm lens (see section 4.3.1, above). You must now focus the light on the grating. The complete grating-based spectrometer setup is shown in Figure 7.
  • Page 15 EDU-SPEB1 & EDU-SPEB1/M Chapter 4: Setup Figure 7 : Grating-Based Spectrometer Complete Beam Path Tip: Due to the sawtooth-like grating structure, the number of observable orders depends upon the direction the grating has been rotated in relation to the optical axis.

  • Page 16: Chapter 5 Spectrometer Theory

    Advanced Spectrometer Kit Chapter 5 Spectrometer Theory 5.1. Introduction A number of experiments can be conducted with this spectrometer kit. First, various types of light sources and spectra can be analyzed. Suitable light sources include:  Incandescent Lamps  Compact Fluorescent (Energy Saving) Lamps ...
  • Page 17 EDU-SPEB1 & EDU-SPEB1/M Chapter 5: Spectrometer Theory ∆s  Figure 8 : Double Slit Showing (a) Waves Emanating from the Two Point Sources and (b) Path Length Difference Between the two Slits Light hits the double slit in the form of a planar wavefront (Figure 8a). In accordance with Huygens' principle, each slit is then the origin of an elementary spherical wave, also called an elementary wave for short.

  • Page 18: Grating Interference

    Advanced Spectrometer Kit 5.2.2. Grating Interference We can model a grating as a number of slits, , as sketched in Figure 9.  ∆s  Figure 9 : Path Length Differences Between Grating “Slits” For the sake of clarity, we will refrain from a detailed, theoretical explanation of gratings, but can still make the following conclusions: Intensity: The intensity...

  • Page 19: Dispersing Prisms

    EDU-SPEB1 & EDU-SPEB1/M Chapter 5: Spectrometer Theory  From this correlation, it is immediately obvious that the angle depends upon the wavelength of the incident light. If we examine light that is composed of many wavelengths, as is the case with our light sources to be examined, these wavelengths are spatially split, and we obtain a spectrum.
  • Page 20 Advanced Spectrometer Kit As the refractive index depends upon the light wavelength, Different wavelengths of light are refracted at different angles, and are thus spatially separated.    60° Figure 10 : Angle of Minimum Deviation in an Equilateral Prism ...
  • Page 21 EDU-SPEB1 & EDU-SPEB1/M Chapter 5: Spectrometer Theory 11 shows the index of refraction over the visible wavelengths for F2, the glass used to construct the prism. Figure 11 : Index of Refraction vs. Wavelength for F2, the Glass Used in the PS868 Prism...

  • Page 22: Chapter 6 Teaching Tips And Experiments

    Advanced Spectrometer Kit Chapter 6 Teaching Tips and Experiments Due to its simplicity, the spectrometer kit makes it possible for students to build a spectrometer themselves. Here, the following qualitative exercises are possible:  Setup and adjustment of the spectrometer. ...
  • Page 23 EDU-SPEB1 & EDU-SPEB1/M Chapter 6: Teaching Tips and Experiments 90°  Figure 12 : Measuring the Angle at which Light Leaves the Grating can be Used to Calculate Wavelength We want to use the wavelength based on the spectrum of the first order to the right of the zeroth order, as this is the most intense (this is in the nature of the blazed grating, see section 5.2.2).

  • Page 24: Exercise 2: Measuring The Index Of Refraction Of The Prism Using A Known Spectral Line

    Advanced Spectrometer Kit If one compares the values of the wavelengths determined in this manner with the literature values, the error rate is under 2%. 6.2. Exercise 2: Measuring the Index of Refraction of the Prism Using a Known Spectral Line ...
  • Page 25 EDU-SPEB1 & EDU-SPEB1/M Chapter 6: Teaching Tips and Experiments  Figure 14 : Measuring the Angle of Minimum Deviation The following example comes from a simple determination of x and y with a ruler during a student experiment. The results of 3 independent measurements are listed: ...

  • Page 26: Chapter 7 Regulatory

    Waste Treatment is Your Own Responsibility If you do not return an “end of life” unit to Thorlabs, you must hand it to a company specialized in waste recovery. Do not dispose of the unit in a litter bin or at a public waste disposal site.

  • Page 27: Chapter 8 Thorlabs Worldwide Contacts

    EDU-SPEB1 & EDU-SPEB1/M Chapter 8: Thorlabs Worldwide Contacts Chapter 8 Thorlabs Worldwide Contacts For technical support or sales inquiries, please visit us at www.thorlabs.com/contact for our most up-to-date contact information. USA, Canada, and South America UK and Ireland Thorlabs, Inc. Thorlabs Ltd.
  • Page 28 www.thorlabs.com...

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