"The choice of detectors depends on Wavelength range,
Spectrometer design characterstics, detector
characteristics such as photosensitivity (responsivity),
noise equivalent power (NEP), detectivity.
Photosensitivity measures the voltage output per unit
of incident radiant at a particular wavelength when
noise is not considerable. NEP measures the quantity
of light when the signal to noise ratio is 1. Detectivity
is a parameter used to compare the performance of
different detectors. Best detector should possess the
higher in the signal of detectivity. Detectity is the
signal to noise ratio at particular electrical frequency
and in a 1HZ bandwidth when 1 watt of radiant on a
1cm2 active area detector. Detectors (table 1) using in
NIR spectrometers are Lead sulphide detectos (PbS),
Lead selenide detectors (PbSe), Silicon detectors,
Indium antimonide detectors, InGaAs, InSb, Common
Charged Coupled Devices (CCD)."
(International Journal of ChemTech Research
CODEN( USA): IJCRGG ISSN : 0974-4290
Vol. 3, No.2, pp 825-836, April-June 2011
Near Infra Red Spectroscopy- An Overview
Hari Prasad Reddy Aenugu, D.Sathis Kumar*, Srisudharson,
N. Parthiban, Som Subhra Ghosh, David Banji)
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