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F.Sun Inc.
TO MY WORLD
Goran Ristic Eng.
Tissue Culture Unit – Requested Project from University of Guelph, Horticultural Science Division, Ontario, Canada. Goal market are Research Institutions and Universities. Device has PLC (Programmable Logic Controller) using PID (4-20mA - Proportional, Integral & Derivation) type of work for control, in two separate (or joined) chambers:
Temperature (+/-0.1oC),
Humidity (+/- 0.1%RH) and
Light Intensity (+/- 0.1 PAR).
Lighting System uses HID (High Intensity Discharge) Lamp and ~500,000 Elementary Fibre Optic Conduits, giving large amount of PAR (Photosynthetically Active Radiation – umol m-2 s-1) over Experimental Petrie dishes, equally divided over two testing chambers.
For humidity production used piezoelectric moisture generator(s) and two Peltier-Elements – (Reversible Heat Pumps) for temperature and humidity regulation. System has easy to clean, low class biohazard protection and special three-degree of freedom doors with self-adjusted, magnetic, function.
Electromagnetic valves with optical level sensors used for humidity - water level regulation.
For quality testing of the Fibre Optic Conduits I have designed and made this
12 Channels Light Meter
using 32 channels PLC (Programmable Logic Controller) Parallax – “Basic Stamp” with implemented Basic Interpreter, using RS 232 standard for communication with PC. For Design and Production of PCB (printed circuit board) I have used
On this page you will find some general overview of my finished projects, which I have done in the last two years (2002-2004) together with equipment used for project’s development. Thank you.
My New Light Sources:
In order to solve randomization problem in production of the fibre optic bundles, I have designed this original device, sphere shaped, with 24 single conduits. This design aloud me to do fine adjustment of every single conduit, so at the end, device will have homogenous light output, which is very important for scientific research.
In the same time fibre-optic is under the much lower thermal stress.
This is a prototype of the Sphere Shaped Light Source.
Photo shows testing of the three fibre conduits using McMahan's LightSpex Spectroradiometer.
Frame is adjustable in order to accept different type of lab measurements.
Connected thermocouples are collecting working temperatures, positioned on the critical places, inside the sphere.
Picture shows testing of a new fibre-optic bundle, 9 legs system for the Hydra project.
I measured light intensity trough every single fibre end, using a McMahan’s LightSpex Spectroradiometer, than temperatures and finally ballast’s power.
Final calculation is giving efficiency of the fibre-optic bundle (quality).
Show walls in my office present “hot projects” with all-important details. There you can see mechanical 3D CAD, high quality rendered pictures, diagrams, all type of measurements, finite elements calculations, electronic projects, mathematical modeling lighting system for production simulation, etc.
Fibre-optic Grower, device capable to provide high intensity light in all stages of plants grows. PLC is controlling distance between fibre-optic ends and plant’s closest surfaces all the time, following the initial PAR setup (hotosynthetically Active Radiation – umol m-2 s-1).
This device is taking care about day – night cycles as well (part of set-up procedure too).
Programmable Logic Controller (PLC) will take other responsibility like pH control, watering or adjusting the feeding components and feeding cycling in hydroponics type of grow procedure than controlling the air temperature, air mixing and air filtering system, etc.
Universal Testing Chamber, updated functionality for different type of new measurements and testing:
Retrofit Program (Fluorescent vs. HID & Fibre-optic System) - Testing
Tissue Culture Unit Simulation (humidity and temperature, PID controlled by PLC hardware & software system)
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My Electronics' Projects
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Testing Chamber updated with the Thermo Climate Unlit, which I have designed some time ago.
Unit for work use "Heat Pumps" - Peltier Elements for temperature and humidity control inside the chamber.
On the picture is visible:
"Hot Side" of device - heat sink with large fan,
Power Supply for Heat Pumps
Set of 4 Relies used for Reversible work of Heat Pumps
Temperature 4-20mA Sensor PID connected - Hewlett Packard
Developing system for testing of PLC used for Tissue Culture Unit's control: Unitronics M-90(PLC or Programmable Logic Controller).
This system has:
Rotating mirror, HID Lamp and Fibre Optic Conduits
My patent pending design – “Impulse High Intensity Light Distribution Fibre Optic System” has been successfully designed and tested. System works from 0.1Hz till 100 Hz and is using 12000 lumens, 150W HID MH Lamp. Benefit of this idea is a large lighting energy savings in horticultural industry and increasing the overall fibre optic efficiency as a distributive light energy system.
Finite Elements Stress Analyzes
I have tested critical subassemblies, inside the Tissue Cultural Unit, using Cosmos Works, software for parts and assembly analyzes, created with Solid Works CAD system.
Mathematical Modeling System
I have designed complex mathematical systemfor creating of fine grid with same light power intensity output, inside the Tissue Culture Unit. That system has been created with MathCAD Professional software using the MathConnex Project Module, doing:
Simulation of 24 light intensity measurements (imaginary instrument, which I have designed later on)
Search for worst fibre conduit’s data (negative selection – filtering method)
Calculation of new drilling diameters for blending holes for fibre optic conduits, using 3rd degree of polynomial regression fit, so complete system of fibre optics will have the same light intensity output at the end, on all levels of light intensity adjusting.
Generate report / request for laser-cuter device (see file: tissue culture 3.msd).
One of done reports using a McMahan’s LightSpex Spectroradiometer measurements and Microsoft Excel program.
Diagram shows Spectral Radiant Intensity Distribution of a Lamp, without Reflector - Philips 150W MH, in function of changed ballast’s output power.
Diagram shows Spectral Radiant Intensity Distribution of a Lamp, Philips 150W MH.
This is one of measurements using a McMahan’s LightSpex Spectroradiometer.
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U90 Ladder software provides a Windows environment for the creation of both the PLC Ladder control program, and the HMI operator interface.
