Home > III International Symposium on Artificial Lighting in Horticulture > A DIGITAL CLOSED-LOOP CONTROL SYSTEM FOR AUTOMATING MEASUREMENTS OF LIGHT COMPENSATION POINTS

Articles

A DIGITAL CLOSED-LOOP CONTROL SYSTEM FOR AUTOMATING MEASUREMENTS OF LIGHT COMPENSATION POINTS

Article number

418_31

Pages

229 – 234

Language

Abstract

An automated system is described for measuring light compensation points (LCP) of plants or plant parts as an alternative for laborious determination procedures whose efficiency depends to a great extent on personal judgement of the research worker.
The system consists of an air-tight transparent container in which the plant or plant part is to be placed and an optional light source which is varied in height interactively with the CO₂ signal through a personal computer in combination with an interface.
PID (proportional-integral-derivative) controller action ensures reaching the LCP and the CO₂ setpoint without overshoot.

Publication

III International Symposium on Artificial Lighting in Horticulture

Authors

M.J. van Lieburg

Keywords

Full text

https://doi.org/10.17660/ActaHortic.1997.418.31

Online Articles (32)

2. PHYSIOLOGICAL ASPECTS OF SUPPLEMENTARY LIGHTING IN HORTICULTURE

R. Moe

3. EFFECT OF LIGHT INTENSITY ON GROWTH AND QUALITY OF CUT ROSES

Hans R. Gislerod | Leiv M. Mortensen

4. EFFECT OF (ADDITIONAL) LIGHTING ON THE PRODUCTION OF VEGETABLE CROPS

A. Durieux

5. EFFECTS OF DIFFERENT LIGHTING STRATEGIES ON THE GROWTH AND DEVELOPMENT OF FICUS BENJAMINA

E. Beel | P. De Bruyn | F. Frederick | R. Lemeur

6. HYDROPONIC LETTUCE PRODUCTION INFLUENCED BY INTEGRATED SUPPLEMENTAL LIGHT LEVELS IN A CONTROLLED ENVIRONMENT AGRICULTURE FACILITY: EXPERIMENTAL RESULTS

A.J. Both | L.D. Albright | R.W. Langhans | R.A. Reiser | B.G. Vinzant

7. THE INFLUENCE OF LIGHT QUALITY ON GAS EXCHANGE OF DENDRANTHEMA

F. Walz | W. Horn

8. YEAR-ROUND SUPPLEMENTARY LIGHTING AT TWELVE PHOTOSYNTHETIC PHOTON FLUX DENSITIES FOR CUT ROSES

N. Bredmose

9. MODELLING THE EFFECT OF SUPPLEMENTARY LIGHTING ON PRODUCTION AND LIGHT UTILIZATION EFFICIENCY OF GREENHOUSE CROPS

J. C.M. de Koning

10. EVALUATION OF AN EMPIRICAL AND A SEMI-MECHANISTIC APPROACH TO PREDICT THE IRRADIANCE INTEGRAL REQUIRED FOR GROWTH OF FOLIAGE PLANTS

F. Fredrick | R. Lemeur

11. QUANTIFYING THE INFLUENCE OF HIGH-PRESSURE SODIUM LIGHTING ON SHOOT-TIP TEMPERATURE

James E. Faust | Royal D. Heins

12. REDUCING ARTIFICIAL LIGHT EMISSION FROM GREENHOUSES

N.E. Andersson | P. Jacobsen

13. INTERACTIONS BETWEEN LIGHT, TEMPERATURE AND CO₂ IN ROOTING OF CONIFER CUTTINGS

B.P.A.M. Kunneman | J.B. Ruesink

14. EFFECT OF PHOTON FLUX DENSITY ON CO₂ FIXATION AND GROWTH OF ROSA HYBRIDA ‘WHITE GEM’ MICROCUTTINGS

B. Matysiak | M. Kubik | M. Podwyszynska | J. Nowak

15. POST-HARVEST WATER UPTAKE AND STEM CONDUCTANCE OF CUT ROSES CV SONIA GROWN WITH SUPPLEMENTAL LIGHTING

G. Slootweg

16. ROLES OF PHOTORECEPTORS AND ENDOGENOUS RHYTHMS IN THE PHOTOPERIODIC CONTROL OF FLOWERING

Peter J. Lumsden

17. ALTERNATIVE SOURCES FOR PHOTOPERIODIC LIGHTING OF GYPSOPHILA

M. Th. de Graaf-van der Zande | T. Blacquiére

18. GROWTH AND FLOWER DEVELOPMENT IN ROSES AS AFFECTED BY LIGHT

Frank M. Maas | Edwin J. Bakx

19. RED/FAR-RED PHOTON FLUX RATIO USED AS AN INDEX NUMBER FOR MORPHOLOGICAL CONTROL OF PLANT GROWTH UNDER ARTIFICIAL LIGHTING CONDITIONS

K. Murakami | I. Aiga | K. Horaguchi | M. Morita

20. CONTINUOUS LIGHT EFFECTS ON PHOTOSYNTHESIS AND CARBON METABOLISM IN TOMATO

S. Globig | I. Rosen | Harry W. Janes

21. EFFECTS OF SUPPLEMENTAL LIGHT QUALITY, QUANTITY, AND DIFFERENTIAL TEMPERATURE ON GROWTH AND DEVELOPMENT OF EASTER LILY (LILIUM LONGIFLORUM)

G. Wulster | Harry W. Janes

22. EFFECTS OF LIGHT QUALITY ON IN VITRO GROWING OF DIEFFENBACHIA CV. COMPACTA

B. Gabarkiewicz | E. Gabryszewska | R. Rudnicki | D. Goszczynska

23. THE EFFECTS OF LIGHT QUALITY ON THE GROWTH AND DEVELOPMENT OF SHOOTS AND ROOTS OF FICUS BENJAMINA IN VITRO

E. Gabryszewska | R.M. Rudnicki

24. EFFECTS OF RED LIGHT ON THE GROWTH AND MORPHOLOGY OF POTATO PLANTLETS IN VITRO: USING LIGHT EMITTING DIODES (LEDS) AS A LIGHT SOURCE FOR MICROPROPAGATION

Y. Miyashita | T. Kimura | Y. Kitaya | C. Kubota | T. Kozai

25. TECHNICAL AND ENERGETIC ASPECTS OF ARTIFICIAL LIGHTING

H. Tantau

26. A MICROWAVE POWERED LIGHT SOURCE FOR PLANT IRRADIATION

A.J. Both | L.D. Albright | C.A. Chou | R.W. Langhans

27. ELECTRIC ENERGY CONSUMPTION AND PPF_i OUTPUT OF NINE 400 WATT HIGH PRESSURE SODIUM LUMINAIRES AND A GREENHOUSE APPLICATION OF THE RESULTS

A.J. Both | L.D. Albright | R.W. Langhans | B.G. Vinzant | P.N. Walker

28. TEMPORARY HEAT STORAGE BY USING COMBINED HEAT AND POWER IN SUPPLEMENTARY LIGHTED GREENHOUSES

J.P.G. Huijs

29. OPTIMAL DIMENSION OF A RESERVOIR FOR TEMPORARY STORAGE OF HEAT SURPLUSES FROM COMBINED HEAT AND POWER IN ARTIFICIAL LIGHTED GREENHOUSES

H.F. de Zwart

30. MODELING OF FLUORESCENT LIGHTING ON MICROPROPAGATION SHELVES

D.E. Ciolkosz | P.N. Walker | R.G. Mistrick | P.H. Heinemann

31. UTILIZATION OF SUPER-BRIGHT LIGHT EMITTING DIODES AS AN ARTIFICIAL LIGHT SOURCE FOR PLANT GROWTH

T. Yanagi | K. Okamoto

32. A DIGITAL CLOSED-LOOP CONTROL SYSTEM FOR AUTOMATING MEASUREMENTS OF LIGHT COMPENSATION POINTS

M.J. van Lieburg