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. Author manuscript; available in PMC: 2011 Aug 1.
Published in final edited form as: Appl Spectrosc. 2011 Feb 1;62(2):206–215. doi: 10.1366/10-06052

TABLE II.

Summary of system features for each optical spectroscopy system tested and a commercial spectrometer system (Skinskan).

System features Diffuse reflection systems tested
SkinSkan
(Commercial
System)		 System 1:
USB+HL		 System 2:
USB+LED		 System 3:
AVA+HL
λ range 200–750 nm 400–800 nm 400–750 nm 400–800 nm
λ resolution 5 nm 2 nm 2 nm 1.5 nm
Detector type PMT CCD CCD CCD
Power consumed 150 W 20 W 1.75 W 20 W
Warm-up time 30 minutes 5 minutes < 1 minute 5 minutes
Intensity drift <0.5% per hour <0.3% per hour <0.05% per hour <0.3% per hour
Linear range 1 × 10−5 to 40 counts 1 × 103–6 × 104 counts 1 × 103–6 × 104 counts 1 × 103–6 × 104 counts
SNR (dB) 35–55 30–60 30–60 30–60
Acquisition time (s) 4–15 0.1–2 0.1–2 0.1–2
~Cost (US$) $25,000 $3800 $2600 $3200