Apogee SS-120 Benutzerhandbuch - Seite 4

Blättern Sie online oder laden Sie pdf Benutzerhandbuch für Messgeräte Apogee SS-120 herunter. Apogee SS-120 20 Seiten. Spectroradiometer

INTRODUCTION

Spectral (i.e., wavelength-dependent) radiation is intensity of output from a radiation source (e.g., sun, electric lamp,

reflected radiation from a surface of interest) as a function of wavelength. Radiation spectra vary for different radiation

sources and conditions. Radiation spectra can be used to characterize radiation sources.

Spectrometers measure relative spectral radiation over a specified wavelength range. Spectroradiometers are spectrometers

calibrated to output spectral measurements in absolute units (e.g., energy flux density in W m

or photon flux density in

-2

-1

µmol m

-2

-1

Typical applications of spectroradiometers include measurement of spectral output from radiation sources used to grow

plants, algae, and corals (e.g., in greenhouses, growth chambers, and aquariums), measurement of solar spectra with

changing atmospheric conditions, and measurement of spectral reflectance on stationary (e.g., agricultural or ecological

weather stations and flux towers) and mobile (e.g., plant phenotyping) platforms.

Apogee Instruments model SS-110 (340 to 820 nm measurement range) and SS-120 (635 to 1100 nm measurement range)

spectroradiometers are small, lightweight units designed for laboratory and field use. Each spectroradiometer consists of a

spectrometer (slit, diffraction grating, detector array), fiber optic, and diffuser mounted in an anodized aluminum housing.

Each unit is calibrated to provide spectral measurements in absolute units. Onboard circuitry allows for output to a computer

(via USB) or datalogger (via ModBus).