11-04-2012, 11:48 AM
MICROPROCESSOR BASED SOLAR TRACKING SYSTEM USING STEPPER MOTOR
[attachment=19884]
OPTICAL SENSING AND PROCESSING :
LDR ( Light Dependent Resistance) is used as a sensor for generating an electric signal proportional to intensity of light falling on it. LDR is mounted at the focus of reflector which is directly mounted on solar energy collectors.
STEPPER MOTOR AND ITS DRIVING CIRCUIT
The stepper motor requires that its
stator windings should be energized
in a programmed sequence to cause
the motor to run in a given
direction and with a required speed.
Hardware design details:
Sensor : The sensor used for pressure measurement is based on microbending principle. The sensor has 2 ft. long fiber of 50 micrometer core diameter. The Fibre is placed between two corrugated surfaces, out of which the upper one is movable and the lower is fixed. Optical power is taken from a 6.0 V drywell torch bulb and is given to the core of the fibre. On application of continuous physical pressure varying from .02 Kg/cm2 to 20 Kg/cm2 on the upper surface, the fibre undergoes a proportional microbending resulting into losses and attenuation of the optical signal. A pin photodiode(SI 100S) acts as photo detector at the receiving end of the fibre.
RESULTS & CONCLUSIONS:
developed instrument was subjected to different magnitude of applied
c as well as dynamic loads. 6. Displa pressure, it is observed that output of amplifier decreases almost linearly in accordance with applied pressure, the system can be used for measuring stati
[attachment=19884]
OPTICAL SENSING AND PROCESSING :
LDR ( Light Dependent Resistance) is used as a sensor for generating an electric signal proportional to intensity of light falling on it. LDR is mounted at the focus of reflector which is directly mounted on solar energy collectors.
STEPPER MOTOR AND ITS DRIVING CIRCUIT
The stepper motor requires that its
stator windings should be energized
in a programmed sequence to cause
the motor to run in a given
direction and with a required speed.
Hardware design details:
Sensor : The sensor used for pressure measurement is based on microbending principle. The sensor has 2 ft. long fiber of 50 micrometer core diameter. The Fibre is placed between two corrugated surfaces, out of which the upper one is movable and the lower is fixed. Optical power is taken from a 6.0 V drywell torch bulb and is given to the core of the fibre. On application of continuous physical pressure varying from .02 Kg/cm2 to 20 Kg/cm2 on the upper surface, the fibre undergoes a proportional microbending resulting into losses and attenuation of the optical signal. A pin photodiode(SI 100S) acts as photo detector at the receiving end of the fibre.
RESULTS & CONCLUSIONS:
developed instrument was subjected to different magnitude of applied
c as well as dynamic loads. 6. Displa pressure, it is observed that output of amplifier decreases almost linearly in accordance with applied pressure, the system can be used for measuring stati