ASD Document 600541 Rev. G 3 TerraSpec® User Manual
www.asdi.com Chapter 1 Introduction
1.1.3 TerraSpec Wavelength Configuration
The near infrared (NIR) is also called the short-wave infrared (SWIR).
The spectral resolution is:
•3 nm (Full-Width-Half-Maximum) at 700 nm.
• 6 nm (Full-Width-Half-Maximum) at 1400 nm.
•6 nm (Full-Width-Half-Maximum) at 2100 nm.
The sampling interval is:
•1.4 nm for the spectral region 350-1000 nm.
•2 nm for the spectral region 1000-2500 nm.
The TerraSpec spectrometer may be configured to have three separate
holographic diffraction gratings with three separate detectors. Each detector is
also covered with the appropriate order separation filters to eliminate second
and higher order light.
• VNIR: 512 element silicon photo-diode array for the spectral region
350-1000
nm.
• SWIR1: graded index, TE-cooled, extended range, InGaAs, photo-diode
for the spectral region 1000
nm to 1800 nm.
• SWIR2: graded index, TE-cooled, extended range, InGaAs, photo-diode
for the spectral region 1800
nm to 2500 nm.
Instrument Configuration Power Rating Maximum
350-1050 nm 12 VDC, 45 Watt
350-1800 nm 12 VDC, 50 Watt
1000-1800 nm 12 VDC, 50 Watt
1800-2500 nm 12 VDC, 50 Watt
1000-2500 nm 12 VDC, 60 Watt
350-2500 nm 12 VDC, 60 Watt
Wavelength Name Wavelength Range
VNIR-SWIR1-SWIR2 350-2500 nm
SWIR1-SWIR2 1000-2500 nm
SWIR2 only 1800-2500 nm
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