onr:"swepub:oai:research.chalmers.se:4b4d53f2-6ff1-4197-a87d-002972a6173a"
Search: onr:"swepub:oai:research.chalmers.se:4b4d53f2-6ff1-4197-a87d-002972a6173a" > Using chlorophyll a...
- 1 of 1
- Previous record
- Next record
- To hitlist
Using chlorophyll a fluorescence gains to optimize LED light spectrum for short term photosynthesis
-
- Ahlman, Linnéa, 1987 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
-
- Bånkestad, Daniel (author)
- Heliospectra AB
-
- Wik, Torsten, 1968 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
- (creator_code:org_t)
- Elsevier BV, 2017
- 2017
- English.
- In: Computers and Electronics in Agriculture. - : Elsevier BV. - 0168-1699. ; 142, s. 224-234
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- When changing from the traditional high pressure sodium (HPS) lamps to light emitting diode (LED) lamps there is a quite unexplored energy saving potential in the fact that they are far better suited for control, since both spectrum and light intensity can be adjusted. This work aims at finding a way to automatically adjust the spectrum of a LED lamp, equipped with several different types of LEDs, to maximize plant growth by feedback of a remote online measure correlated with growth.A series of experiments were conducted on basil plants in order to examine whether remotely sensed steady-state chlorophyll fluorescence (F740) can be used for this purpose, and if its derivatives (fluorescence gains) w.r.t. applied powers change relative to each other for different light intensities and spectraA strong correlation between F740 and photosynthetic rate was indeed found. However, the order (w.r.t. LED type) of the fluorescence gains was only moderately affected by the light intensities and spectra investigated. The gain was highest w.r.t. red light (630 nm), though, when taking the electrical efficiencies of individual LED types into consideration, blue LEDs (450 nm) were equally, or even more efficient than the red onesAn online controller to regulate optimal spectrum for basil appears to be unnecessary. However, the fluorescence gains could be used to adapt to changes in the efficiencies when crops and operating conditions change, or when the diodes degrade. The method also shows promise as a tool to find optimal light intensity levels as well as identifying plant stress.
Subject headings
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Reglerteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Control Engineering (hsv//eng)
Keyword
- Chlorophyll fluorescence
- Greenhouse illumination
- Optimal light spectrum
- Light emitting diode (LED)
- Fluorescence gain
- Photosynthesis
Publication and Content Type
- art (subject category)
- ref (subject category)
Find in a library
- Computers and Electronics in Agriculture (Search for host publication in LIBRIS)
To the university's database
- 1 of 1
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Ahlman, Linnéa, ...
- Bånkestad, Danie ...
- Wik, Torsten, 19 ...
- About the subject
-
- NATURAL SCIENCES
- NATURAL SCIENCES
- and Biological Scien ...
-
- ENGINEERING AND TECHNOLOGY
- ENGINEERING AND ...
- and Electrical Engin ...
- and Control Engineer ...
- Articles in the publication
- Computers and El ...
- By the university
- Chalmers University of Technology
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
