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Sample Setup: Upwelling / Downwelling

Overview

Upwelling radiation is radiation -- either reflected solar or emitted terrestrial -- that is directed upward from the earth's surface. Downwelling radiation is radiation that is directed toward the earth's surface from the sun or atmosphere. The relationship between the two (albedo) can be used to derive spectral information from vegetation, forest canopies, seabeds and more.

Spectrometer

An HR4000 Spectrometer with an HC-1 grating provides an elegant solution for upwelling and downwelling measurements. The HC-1 is a variable-blazed grating that covers the 200-1050 nm wavelength range; optical resolution is ~1.5 nm (FWHM) with a 50 µm slit as the entrance aperture. An OFLV-200-1100 Order-sorting Filter eliminates second- and third-order effects.

Sampling Optics

he spectrometer connects to a patch cord that screws into the CC-3-UV Cosine Corrector. The CC-3-UV can be used as part of a configuration for measuring absolute spectral irradiance. You’ll need a DH2000-CAL (or LS-1-CAL for 300-1050 nm only) to calibrate the absolute spectral response of the system and SpectraSuite Spectroscopy Operating Software to calculate spectral intensity and photopic data in lumens, lux or candela. An alternative to the CC-3-UV is a Gershun tube, which has fixtures for adjusting the area of light from 1° to 28° and attaches directly to the spectrometer or to an optical fiber.

Ordering Information

Spectrometer Components	Price
HR4000 High-resolution Spectrometer	$4,619
50 µm Slit as entrance aperture	$174
Grating HC-1, 200-1050 nm range	$693
DET4-200-1100 Detector with OFLV-200-1100 Order-sorting 24 Filter and UV4 Detector Window Upgrade	$462

Sampling Components Price

DH2000-CAL Radiometric Calibration Standard $3,925

QP400-2-UV-VIS Premium-grade Patch Cord Assembly $196

CC-3-UV Cosine Corrector $150

SpectraSuite Spectroscopy Operating Software $199

ASP Annual Service Package Call for Price

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