Science and Engineering » Hönnun » Precision Machine Design 2011

h1. Spectrometer

Working with lists using this wiki is not fun at all. Will create a folder for FRs and DPs in subversion where I upload both a .tex file and .pdf. Looks good, easy to edit and we can track changes.

> -Arnar

h2. Functional Requirements (FR)

1. Measure light intensity at a fixed frequency (visible light)

> (a) Split light

> (b) Select frequency

> > i. Resolution

> > > A. Wavelength selectable in 1-10 nm steps

> (c) Measure the light intensity over the full spectrum of VIS light

> > i. Accurate -> no more than 1% off (5 nm)

> > ii. Reasonably fast -> each scan of the spectrum should take no more then XX second(s)

> > iii. Re calibration after scan should not be required.

> (d) Repeatable Measurements

> > i. Light intensity measured for a given sample at a fixed frequency should have minimal drift (< 1% ?) over the course of one experiment (2 hours)

2. Communicate data to student for plotting

> (a) Store data

> (b) Display data

3. Set up by instructor in < 15 minutes

4. Able to manufacture locally

5. User friendly for 1st year students

> (a) Easy to calibrate

> > i. Calibrating the light sensor takes less than 1 min

> > ii. Zero the spectrometer

> > iii. No additional equipment required for calibration

> (b) Independent of computer, or plug & play

6. Expected lifetime 3-5 years

> (a) Rugged

> > i. No irreversible damage from 15 cm drop to lab bench

> > ii. Chemical spills

> > > A. Conductive liquids do not damage electronics

h2. Design Parameters (DP)

1. Light source, diffraction grating, movable slit + sensor

   Moved to correct distance and held there.

> (a)

> (b)

> (c) Light sensor and diffraction grating

>     on

h2. Vendors