Measure the mass of an eyelash with a DIY microbalance

TL;DR

Build a microgram balance using a panel meter, opto interrupter, and op-amp for ultra-sensitive measurements.

Transcript

hey everyone here's the very sensitive balance that I built that's capable of measuring down to about 10 or 20 micrograms so this project was based on a design demonstrated and built by Paul Gro Hey and I'll put a link in the description I started by taking apart an old panel meter that came out of a broken vacuum gauge one thing to keep in mind is... Read More

Key Insights

• 🔁 Using an opto interrupter in a servo loop creates a feedback mechanism for precise weighing.
• ⚖️ The DIY microgram balance demonstrates the potential for ultra-sensitive measurements in a homemade setup.
• 🏋️ Precision testing on the balance involved weighing small items to gauge accuracy.
• 🧑‍🏭 Stability and noise control are critical factors in optimizing the performance of the microgram balance.
• 👷 Further enhancements, like construction refinements and filtering techniques, could increase precision in microgram measurements.
• ⚖️ Proper calibration and meticulous adjustments are essential for maintaining the balance's accuracy.
• 📽️ The DIY project showcases ingenuity in creating a highly sensitive balance using readily available components.

Questions & Answers

Q: How was the DIY microgram balance constructed?

The balance was built by repurposing a panel meter, mounting it on an acrylic block, and adding an opto interrupter in a servo loop circuit controlled by an op-amp.

Q: What factors affected the stability of the microgram balance?

Stability was influenced by the quick response of the opto interrupter, necessitating precise tuning to avoid oscillation and the need for additional sensing or physical damping.

Q: How was the precision of the microgram balance tested?

Precision was tested by weighing paper squares and smaller cutouts, eyelashes, and sugar grains on the balance, using voltage readings to correlate with microgram weights.

Q: What improvements could be made to enhance the precision of the microgram balance?

Better construction techniques, noise reduction measures, and high low-pass filtering for extended sampling periods could improve precision, potentially allowing for single-digit microgram measurements.

Summary & Key Takeaways

• A DIY microgram balance was created using an old panel meter, opto interrupter, and op-amp circuit for precise weighing.

• The balance operates on a servo loop mechanism to control the meter needle based on light interruption.

• Testing the balance involved measuring the weight of paper squares, eyelashes, and sugar grains to assess precision.