A spectrometer is constructed with an optical fiber, a webcam, and an inexpensive diffraction grating. Assembly takes a matter of minutes, and the instrument is able to produce quantitative spectra of incandescent and fluorescent sources, lasers, and light-emitting diodes. Examples of data analyses, carried out with free software, are discussed.

1.
S.
Gil
,
H. D.
Reisin
, and
E. E.
Rodriguez
, “
Using a digital camera as a measuring device
,”
Am. J. Phys.
74
,
768
775
(
2006
).
2.
A.
Ramil
,
A. J.
Lopez
, and
F.
Vicitorio
, “
Improvements in the analysis of diffraction phenomena by means of digital images
,”
Am. J. Phys.
75
,
999
1002
(
2007
).
3.
Z. J.
Smith
,
K.
Chu
,
A. R.
Espenson
,
M.
Rahimzadeh
,
A.
Gryshuk
,
M.
Molinaro
,
D. M.
Dwyre
,
S.
Lane
,
D.
Matthews
, and
S.
Wachsmann-Hogiu
, “
Cell-phone-based platform for biomedical device development and education applications
,”
PLoS One
,
6
,
e1570
(
2011
).
4.
G. C.
Lisensky
,
R.
Penn
,
M. J.
Geselbracht
, and
A. B.
Ellis
, “
Periodic properties in a family of common semiconductors
,”
J. Chem. Educ.
69
,
151
156
(
1992
).
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