Diy Spectroscope

Introduction

Spectroscope. Spectrometer is the machine to give the readings.

Spectroscope can be made using

• Diffraction grating; eg. CD or DVD disk, or
  • Natural gratings: Striated muscle, peacock feathers, mother-of-pearl, and butterfly wings. Some invertebrate animals, like the peacock spiders, the antennae of seed shrimp, and Burgess Shale fossils
  • Iridescence in birds, fish and insects is often caused by thin-film interference
• Prism

Theory

Interference.

Spectral lines

See:

DIY

Below is collection of some tutorials.

CD (and DVD) consists of two layers that will split apart when cutting the disk. We will discard the reflective part (the one with the silver coating).

DVD: Cut out a section of the DVD and then carefully peel it into two pieces. Use the clear piece.

Two different models:

1. Look-through
   • Square diffraction grating
2. Use the reflection: Put the CD with the shiny side facing upward into the slit.

Both will have the slit where the light source enters the spectroscope. If this slit is too large, it can affect the clarity of the spectrum.

• Use two razorblades to make the slit, and put one sheet of paper in between the blades to get correct spacing.
• the concentric grooves along the disk are lined up such that they are parallel to the slit. Otherwise, no diffraction.

CD and DVD and a paper tube. Paint black.

• Remove the reflective layer form the cd using tape. Make sure the lines of the cd are parallel to de slit on top of the roll. Look thought the cd. https://www.instructables.com/DIY-Spectroscope/
• https://littlebinsforlittlehands.com/diy-spectroscope/
• The viewing hole doesn’t need to be too big as we want to avoid outside light from getting into this hole. https://www.moonbow.world/homemade-spectroscope/
• twist the slit around until the rainbow is as tall or large as you can make it. When it is as tall and large as possible, tape it in place. https://www.acs.org/education/celebrating-chemistry-editions/2024-ncw/diy-spectroscope.html

Diffraction grating

• Point the thin slit at a light source (light bulb, lamp, etc.) and look through the transparent diffraction grating. You will see light diffracted on the right and left sides. https://www.instructables.com/A-Simple-Spectroscope/

References

https://mpr-projects.com/index.php/2024/05/23/building-a-diy-spectroscope-video/

• Use "an analogue pocket spectroscope".

https://www.instructables.com/DIY-Low-Cost-Spectrometer/

• Good stuff.
• Slit, CD grating etc.
• Adjust the position of the webcam till the diffraction spectrum is positioned in the center of the image.

https://www.exploratorium.edu/snacks/cd-spectroscope

https://edu.rsc.org/feature/build-your-own-spectrophotometer/2020107.article

• Nice! spectrophotometer

https://www.cloudynights.com/topic/751583-my-3d-printed-diy-spectrograph/

• a 1000 l/mm diffraction grating slide (5$ on ebay)
• an old SLR 50mm f/2.0 lens by Ricoh as the collimator lens, a C-mount zoom f1.2 Computar lens as the camera lens, and a cheap B&W C-mount astrocamera ToupTek.

https://github.com/mpr-projects/DIY-Spectroscope

• Code for spectrometer

https://physicsopenlab.org/2021/12/31/17034/

• DIY Raman system, based on a 532 nm DPSS laser and a B&W Tek surplus spectrometer

https://www.amnh.org/content/download/45894/703630/file/building-a-spectroscope.pdf