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CONTROL SYSTEM FOR POLARIMETER

Rishabh Shukla

Electronics & Communication Engineering,RJIT Gwalior

*

Joined PRL on June 3, 2013under the guidance of Dr. Shashikiran Ganesh

*

Summer Research Fellowship Programmeorganized by

Indian Academy of Sciences

July 8, 2013

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Overview

Embedded Control Sytem of Polarimeter

1 Hardware Used2 Drawbacks in System

New Control System

1 Its Features2 Linux Device Driver Programming

Summary

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Present Embedded Control System

First Board is used for

interfacing I/O DevicesBoard for controlling USBinterfaced Charge CoupleDevice(CCD) camera.Board for Ethernet connectivityfor communication between

various CPU.Set of 3 boards with 82c54 ICsto rotate stepper motor and tocount pulses from two PMTs.

Drawbacks in present Device

Too many boardsDifficulty in debugging during observations

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New Control System

Based on Mesa 4i22 counter/timer board mounted on a faster CPUboard.

Figure: New Control System

FeaturesMesa 4i22 with 3 82C54,sufficient to control entireinstrumentIntel Atom 1.66Ghz Processor

667MHz 2 GB DDR SDRAMOnboard Flash memory for OSand data

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Linux Kernel Level Programming

Both user space and kernel space code was written for Ubuntu 12.04(Kernel 3.2.x).

Figure: Waveforms obtained

WaveformsCH1 wave (orange) representssystem clockCH2 waveform (cyan) is forenabling and disabling countersin 4i22 Board to count pulsescoming from PMT

Third waveform (magenta) isapplied to each phase of thestepper motor with an offset bythe system clock for each phase.

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Summary

At Mt. Abu Observatory

1 Gained familiarity with observational Astronomy and itsInstrumentation Aspects.

At Thaltej campus Laboratory

1 Learned and subsequently developed device driver and user programin Linux Kernel 3.2.x (in C).

2 Developed Program is being tested in lab.

Task yet to be done

1 Modify the code taking in account hardware interrupts for countingpulses from PhotoMultiplier tube

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Any Questions

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THANK YOU

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