Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

Optical Spectrum Analysis Laboratory Exercise: Characterizing Light Sources, Exams of Electrical and Electronics Engineering

A laboratory exercise conducted at southern polytechnic state university's ecet 3410 course, focusing on optical spectrum analysis using the ms96a optical spectrum analyzer. Students are required to characterize the wavelength-color perception of their vision system, record spectra of red light, an incandescent lamp, and a fiberoptic led, and analyze the results. The exercise includes cautions, procedure, and analysis sections.

Typology: Exams

Pre 2010

Uploaded on 08/03/2009

koofers-user-8rc-1
koofers-user-8rc-1 🇺🇸

10 documents

1 / 2

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
- 1 - 07/17/00
Southern Polytechnic State University ECET 3410 Laboratory Exercise No. 10
Electrical and Computer Engineering Technology Optical Spectrum Analysis
Introduction
In this exercise you will work with some of the information discussed in class and in your textbook to become
acquainted with spectral measurements and the MS96A Optical Spectrum Analyzer.
Cautions
Never connect an LED to a DC supply without an appropriate series current-limiting resistor. Always check the
polarity of the supply before energizing reverse biasing the LED will destroy it immediately.
Procedure
Note: this TYPEFACE literally denotes a control on an instrument’s front panel
this TYPEFACE literally denotes a label on an instrument’s front panel
1. Characterize the wavelength-color perception of your primitive optical test set (that is, your vision system) by
finding what colors correspond to what wavelength ranges for your vision. Use the Fiberoptic Illuminator
Model 77503 and set the INTENSITY control such that the lamp-drive in 10.0 V. Test your vision
between 400nm λ 700nm by projecting the output beam on a white surface and recording at which
wavelengths you perceive the spectral colors to change.
2. Set the Fiberoptic Illuminator to output red light. Introduce the output beam into the input port of the
MS96A Optical Spectrum Analyzer. Display and make a hardcopy record of the spectrum of this red light
(PRINT).
The best way to find the spectrum is to select LOG (Scale), AUTOSCALE, and SINGLE (Sweep Mode).
Then, refine the display using the WAVELENGTH and SCALE controls until the spectrum display is
adequate. Finally, choose LINEAR (Scale) so that your spectrum will be comparable to those on data-
sheets and in your textbook. Print a hardcopy of this final spectrum display using the instrument’s internal
printer.
3. Repeat the procedure of step 2 to display the linear spectrum of a 12-V incandescent lamp. Print a copy of
the displayed spectrum.
4. Repeat the procedure of step 2 to display the linear spectrum of a T-1510 (or similar) fiberoptic LED biased
at a forward current of 40mA. Print a copy of the displayed spectrum.
5. If available, repeat the procedure of step 2 to display the linear spectrum of a He-Ne (red) laser. Print a
copy of the displayed spectrum
pf2

Partial preview of the text

Download Optical Spectrum Analysis Laboratory Exercise: Characterizing Light Sources and more Exams Electrical and Electronics Engineering in PDF only on Docsity!

  • 1 - 07/17/

Southern Polytechnic State University ECET 3410 Laboratory Exercise No. 10

Electrical and Computer Engineering Technology Optical Spectrum Analysis

Introduction

In this exercise you will work with some of the information discussed in class and in your textbook to become acquainted with spectral measurements and the MS96A Optical Spectrum Analyzer.

Cautions

Never connect an LED to a DC supply without an appropriate series current-limiting resistor. Always check the polarity of the supply before energizing – reverse biasing the LED will destroy it immediately.

Procedure

Note: this TYPEFACE literally denotes a control on an instrument’s front panel this TYPEFACE literally denotes a label on an instrument’s front panel

  1. Characterize the wavelength-color perception of your primitive optical test set (that is, your vision system) by finding what colors correspond to what wavelength ranges for your vision. Use the Fiberoptic Illuminator Model 77503 and set the INTENSITY control such that the lamp-drive in ≤ 10.0 V. Test your vision between 400nm ≤ λ ≤ 700nm by projecting the output beam on a white surface and recording at which wavelengths you perceive the spectral colors to change.
  2. Set the Fiberoptic Illuminator to output red light. Introduce the output beam into the input port of the MS96A Optical Spectrum Analyzer. Display and make a hardcopy record of the spectrum of this red light ( PRINT ).

The best way to find the spectrum is to select LOG (Scale), AUTOSCALE , and SINGLE (Sweep Mode). Then, refine the display using the WAVELENGTH and SCALE controls until the spectrum display is adequate. Finally, choose LINEAR (Scale) so that your spectrum will be comparable to those on data- sheets and in your textbook. Print a hardcopy of this final spectrum display using the instrument’s internal printer.

  1. Repeat the procedure of step 2 to display the linear spectrum of a 12-V incandescent lamp. Print a copy of the displayed spectrum.
  2. Repeat the procedure of step 2 to display the linear spectrum of a T-1510 (or similar) fiberoptic LED biased at a forward current of ≤ 40mA. Print a copy of the displayed spectrum.
  3. If available, repeat the procedure of step 2 to display the linear spectrum of a He-Ne (red) laser. Print a copy of the displayed spectrum

Analysis

In a (computer generated) memo format of no more than two pages (excluding exhibits), pull the following information together and advise the reader of what was done and what the important results were. Assume that the reader of your memo is technically trained but very busy; thus the memo should be concise and professionally formatted such that any important results are easy to identify.

  1. Does your visual system weight all visible spectral colors equally or do some colors seem to predominate your vision? What do you think of using your eyes as a test instrument?
  2. Using the linear spectra plots from each of the three (four) sources, measure the peak wavelength (λp) and the FWHM (∆λ) spectral width of each source. Tabulate and compare the results.

Which source is closest to monochromatic? Explain.

  1. The vertical scale of the optical spectrum analyzer displays spectral radiant power. Unfortunately, the display does not show the proper units. What should the vertical scale units be? Explain.
  2. Use the spectrum results for the incandescent lamp to explain why these light sources are usually considered inefficient or undesirable as a light source for humans.

Attach a copy of your raw data (spectral plots) to the back of your memo.