Heliotropio Stefanides

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The primary function is to orientate a solar collector to face the Sun [to be proshelios], with AZIMUTHIAL tracking of 270 Deg and ALTITUDINAL 90 Deg .The concept is based on the idea of combining a signal indicating the direction of the sun rays, within one solid angle of “quarter hemisphere”, with a signal indicating, similarly quarterly, the relative angular displacement (or error) between the sun rays’ direction and the tracker’s orientation AZIMUTHIALLY. http://www.youtube.com/pstefanides#p/u/114/D2puwgq6r90 />http://www.stefanides.gr/Pdf/HELIOTROPIO.pdf />The direction of the sun rays, may be within one of four of a set of such angles: ?, ? or ? at any time of the day (? being the Night Region).These are separated to each other by “LIGHT SCREEN [CROSS] PLATES” which are orthogonal to each other with their, theoretical, section line vertical to the ground plane and “Fixed” with respect to ground.
Similarly, the orientation of the tracker, with respect to the sun rays‘ direction is indicated by angles : ?’, B’, ?’ and ?’.This set of angles is constructed similarly with that of the “Fixed” ones but it “Rotates” in step with the vertical shaft AZIMUTHIALLY. Optical sensors within angles [four in each one – if A is set by light at logic level “1” then B, ? and ? are set to level “o”, unless equally lighted such as the case of STOP: ?’.?’] give signals, processed by the logic unit of the system. A table is drawn for the “BOOLEAN ALGEBRA” combinations for CLOCKWISE, ANTICLOCKWISE and STOP requirement conditions. The sets of combinations minimize to the following functions [“AND” functions]:
CLOCKWISE ROTATION: ?.?’, ?.?’, ?.?’, B.A’, B.B’, ?.?’ - ANTICLOCKWISE ROTATION: ?.?’, ?.?’, ?.?’, ?.?’, ?.?’, ?.?’, ?.?’ - STOP: ?’.?? or ? [Night Region 90 Deg as assumption here for the design conditions]. The AZIMUTHIAL reciprocation is assumed 270 Deg for SUN- RISE /SUN-SET in summer [for Greece it is about 222 Deg ].The vertical [ALTITUDINAL] reciprocation BEGINS when the AZIMUTHIAL STOPS. Functions here are simple [up and down reciprocation 90 Deg]. Other combinations [erratic which may, indeed, occur] beyond specified, are considered incompatible and bring the system to total STOP, until self rectification.
The cost for the Tracker System is that of the two printed circuit boards, electronic components, sensors, wirings and connectors.
AWARD: Archimedes Silver Medal [no monetary one]
Applications of this system derivatives, BASED ON THE SAME CONCEPT, may be contemplated [including satellite solars] given the appropriate kind of “SENSORS” and “SEPARATORS” [“octal sphere” solid angles’ detection systems for space] for the kind of forms of radiation searched.
Ref to a time/speed measuring application:
http://www.youtube.com/pstefanides#p/u/0/gov5LpIdsmE http://www.stefanides.gr/Pdf/SENSORS_93_TECHNICAL_CHAMBER_OF_GREECE_PANAGIOTIS_STEFANIDES.pdf
Personal info: http://www.stefanides.gr /> Patents all[7]expired.


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  • Name:
    Panagiotis Stefanides
  • Type of entry:
  • Software used for this entry:
    Boardmaster for Printed Circuit Design
  • Patent status: