Anna Shafer

Edmond Wilson, Ph.D.

NSSSC 2014 HARDING UNIVERSITY

NATIONAL STUDENT SOLAR SPECTROGRAPH COMPETITION

• Design & Build

• Analyze

• Outreach

• Compete

NSSSC 2014 TEAM

Tamara Reed

Brennan Thomason

Anna Shafer

Stephanie Inabnet

SPECTROMETER DESIGN

SPECTROMETER CONTROL

Wavelength Selection

Focus on Wavelength

Capture and Process

Write Spectra to

SD Card

WAVELENGTH SELECTION• Grating position

• Turntable mount

• Precision

STEPPER MOTOR• Controls grating position

• Precision to 1.8°o Direction selectiono Pulse input

STP-DRV-4035

STP-MTR-17040

PROCESSINGCommunicat

e• Processor and detector

Capture • Read spectral output

Filter • Average to remove noise

Store • SD card via shield

COMMUNICATION• Timing signals

o Synchronization: ROGo Data Clock: CLK

• 2087 bytes per spectra

Arduino UNO

SONY ILX511

COMMUNICATION TIMING• Chart for the timing

COMMUNICATION TIMING

SPECTRA CAPTURES

ANALOG CAPTURE• Sampling Accuracy

o Speed: 20 µseco Reference voltage 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

020406080

100120140

Default Reference

Time (sec)

Volta

ge (m

V)

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

20406080

100120140

Internal Analog Reference

Time (sec)

Volta

ge (m

V)

FILTER AND STORE• Noise removal

oMultiple readings – 3 to 5o Average data points

• SD cardo 9600 baud serialo .csv format

QUESTIONS?