Spektrografi med digitalkamera og gitter

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Index to pictures of atomic spectra

Mads Hammerich,  mhammerich@vip.cybercity.dk

Index to pictures of atomic spectra used to illustrate the paper: Spektrografi med digitalkamera og gitter. (Spectrography with digital camera and grating) issued in LMFK bladet, May 2004.

Click the picture number below to view the picture.

Copyright notice

All pictures are copyright to Mads Hammerich, mhammerich@vip.cybercity.dk. You may use these pictures for educational purposes in your own class. All other use requires written permission from me.

Software

Carl Hemmingsen who has written the data acquisition program DATALYSE, have modified this program to semiautomatic extraction of spectral data from jpeg-pictures like these. Please feel free to send him a mail on the address: postmaster@datalyse.dk.

Details of the various setups

1: Camera: Canon G3 4 x zoom

• Slit: Adjustable physics lab slit.
• Grating: holographic, blazed, 1000 l/mm from Spindler & Hoyer right in front of the camera lens, normal to the optical axis of the camera. Direction to slit adjusted in order to place the green part of the spectrum approximately in the middle of the picture.
• Distance grating-slit approx. 42 cm
• In this setup a narrow reference spectrum from cadmium is photographed with the spectrum. This light comes from a Philips type 03107E lamp.
• The four most intense Cd lines are:

2: Camera: Canon G3 4 x zoom

• Slit: nonadjustable.
• Grating: ca 500/mm Edwards scientific transparent diffraction grating cut from a larger sheet.
• Hoyer placed right in front of the camera lens, normal to the optical axis of the camera. Direction to slit adjusted in order to place the green part of the 1^st order spectrum approximately in the middle of the picture.
• Distance grating-slit approx. 31cm

3: Camera: Canon G3 4 x zoom

• Slit: nonadjustable.
• Grating: ca 500/mm Edwards scientific transparent diffraction grating cut from a larger sheet.
• Hoyer placed right in front of the camera lens, normal to the optical axis of the camera. Direction to slit adjusted in order to place the green part of the 1^st order spectrum approximately in the middle of the picture.
• Distance grating-slit approx. 53 cm

4: Camera: Canon G3 4 x zoom

• Slit: There is no slit. The approx 2 mm dia. discharge from a geissler tube is used instead.
• Grating: transparent glass mounted replica grating marked 15000 lpi (lines per inch)
• placed right in front of the camera lens, normal to the optical axis of the camera. Direction to discharge is adjusted in order to place the green part of the 1^st order spectrum approximately in the middle of the picture.
• Distance grating-geissler tube 3,00 m