Listen to Protons with a Homemade Magnetometer
Summary of the Article: building a Proton Magnetometer with Salt Bottles
This article details how to build a simple proton magnetometer – a device that can literally allow you to hear protons – using readily available materials like Morton seasoning bottles, wire, distilled water, and basic electronic components.Here’s a breakdown of the key points:
How it effectively works:
* Proton Wobble & Signal: When protons are aligned by a magnetic field and then that field is removed,they “wobble” (precess) at audio frequencies. This wobble induces a voltage in a nearby coil of wire.
* Coils & Noise Cancellation: Two counterwound coils are used to cancel out external electromagnetic noise (like from power lines) while amplifying the signal from the precessing protons. Morton seasoning bottles are ideal coil forms due to their size and molded shoulders.
* Three Modes: The magnetometer operates in three modes controlled by a three-position switch:
- DC Polarization: A DC current is sent thru the coils to align the protons in distilled water.
- Field Collapse: The current is cut off, allowing the magnetic field to collapse and initiating proton precession.
- Listening Mode: The coils are connected to a sensitive audio amplifier, allowing you to hear the signal from the wobbling protons.
Key Components & Techniques:
* Morton Seasoning Bottles: Used as coil forms.
* 22-Gauge Wire: Approximately 450 grams are needed to wrap around each bottle, creating around 500 turns per coil.
* Distilled Water: Used to fill the bottles and provide the protons to be measured.
* MOSFET as a zener Diode: A crucial component to prevent damaging high-voltage sparks when switching from polarization to listening mode. It limits the voltage across the coils during field collapse.
* Amplifier: A sensitive audio amplifier is needed to boost the weak signal from the coils.
Important Considerations:
* Location: the magnetometer shoudl not be used indoors or near iron-containing objects.
* Safety: The circuit is designed to avoid damaging sparks, but careful construction is still necessary.
In essence, the article provides a fascinating and surprisingly accessible guide to building a device that demonstrates a essential principle of physics - the magnetic properties of protons – in a way that can be heard.