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Home Knowledge Base Applications and Uses of Spectroradiometers

Applications and Uses of Spectroradiometers

Solar Irradiance

All spectroradiometer models are capable of measuring the photon flux

and energy flux across the reported wavebands. The figure at the right

shows the difference between photon flux and energy flux.

Click to view graph that shows a relative increase in UV and blue photon

flux near solar noon and a shift to a greater relative proportion in near

infrared photon flux in the morning and evening.

Click to view graph showing waveband ratios from the above sun spectra

were calculated to further illustrate the spectral shift of the sun through the

day as the zenith angle changes.

Reflectance

Dr. Glen Ritchie of the University of Georgia has used model PS-100

spectroradiometer to take reflectance measurements in cotton fields and

estimate defoliation. Chlorophyll gives plant leaves a reflectance

spectrum characteristically different from that of soil. Reflectance

measurements can be reported in μmol m-2 s-1, W m-2, or as a relative

value.

Ritchie, G. I., C. W. Bednarz, 2005. Estimating Defoliation of Two Distinct

Cotton Types Using Reflectance Data. The Journal of Cotton Science,

9:182-188.

View poster presented at ASA meeting, 2006:

Estimating Cotton Defoliation with Reflectance

Irradiance

Dr. A. J. Both of Rutgers University used our PS-100 spectroradiometer to

examine the output of several LED lamps and traditional lamp and

evaluated their usefulness for greenhouse and growth chamber

applications.

In the graph at the right, these lamps are compared to the solar spectrum

and the Relative Quantum Efficiency (RQE).

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Common Spectral Lamps Efficiency

Spectral Efficiency ∗

LED Lamps

HPS 0.89Super Blue

0.72

MH 0.78Super Red

0.98

INC 0.49Cool White

0.80

FCW/FWW 0.86/0.87Warm White

0.82

Sun 0.64 Plant Bar 0.92

∗ Bugbee, 1994: PPF Correction Factor = [(PF)i ∗ (RQE)i]360-760 / (PAR)400-700

Transmission

The transmission spectra below reveal the different pigmentation in two

leaf samples. Both leaves came from Norway Maple cultivars, one a dark

red variety and the other bright green. Click for a larger view.

Journal Articles

Chen, M., M. Ni, 2006. RED AND FAR-RED INSENSITIVE 2, a RING-Domain Zinc Finger Protein, Mediates Phytochrome-Controlled

Seedling Deetiolation Responses. Plant Physiology, 140:457–465

Engelen-Eigles, Gerard, Greg Holden, Jerry D. Cohen, Gary Garnder, 2006. The Effect of Temperature, Photoperiod, and Light Quality on

Gluconasturtiin Concentration in Watercress (Nasturtium officinale R. Br.) Journal of Agricultural and Food Chemistry, 54:328–334.

Folta, K. M., 2004. Green Light Stimulates Early Stem Elongation, Antagonizing Light-Mediated Growth Inhibition. Plant Physiology,

135:1407–1416.

Gardner, Gary, Chentao Lin, Elaine M. Tobin, Heather Loehrer, Doug Brinkman, 2009. Photobiological properties of the inhibition of

etiolated Arabidopsis seedling growth by ultraviolet-B irradiation. Plant, Cell and Environment, 32:1573–1583.

Larsen, H., F. Westad, O. Sørheim, L. H. Nilsen, 2006. Determination of Critical Oxygen Level in Packages for Cooked Sliced Ham to

Prevent Color Fading During Illuminated Retail Display. Journal of Food Science, 71(5):S407–S413.

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