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Faraday Rotation

Introduction The Faraday effect or Faraday rotation is a magneto-optical phenomenon — that is, an interaction between light and a magnetic field in a medium. The Faraday effect causes a rotation of the plane of polarization which is linearly proportional to the component of the magnetic field in the direction of propagation. This effect occurs in most optically transparent dielectric materials …

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Right or Left ? Optical Activity & Chirality

Introduction In nature, the right and the left are NOT interchangeable. Chirality (a property of a rigid object that cannot be superimposed on its mirror image) was discovered by Louis Pasteur in 1848, studying the optical properties of a compound well known to oenologists, tartaric acid. Chirality is primarily a …

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Polarization of Light

We know that to experiment with light polarization it is necessary to have a rotatable support to hold the polarizing filter, such equipment are really expensive ! But everything changed when we found on eBay a simple rotatable platform for a robotic arm, the following picture shows the”gadget” (search online …

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Surface Plasmon Resonance

In the image above the evanescent wave excites the plasmon resonance on the surface of a thin layer of gold, the plasmonic wave is diffused and gives rise to the luminous red spot that can be seen on the prism. In this post we show how to carry out an experiment …

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Light Scattering

Introduction The diffusion of light, also known as scattering, is a phenomenon which consists in the re-emission in many directions (usually non-random) of a beam of light that strikes a set of dispersed particles of variable size present in a system that can be in a solid, liquid or gaseous …

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Geomagnetic Field “Real Time” Monitoring

In the picture above an example of a geomagnetic storm detection. With the equipment described in the posts : Fluxgate Magnetometer, Geomagnetic Field we have created a small geomagnetic observatory and in this page we insert the real-time data read by the system and some analysis examples. The sensor has …

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Geomagnetic Field

Introduction The geomagnetic field is a natural physical phenomenon present on the planet Earth. It is similar to the magnetic field generated by a magnetic dipole with non-static magnetic poles that do not coincide with the geographical ones, and with an axis inclined at 11.30 ° with respect to the …

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FluxGate Magnetometer

Fluxgate Magnetometer The fluxgate magnetometer is a device that serves for the vectorial measurement of low intensity magnetic fields. This device is relatively simple but allows to reach resolutions of the order of the nanotesla. It is widely used when high resolution is required but at the same time reliability, …

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Sound Experiments

The most obvious use for a sound card interfaced with a computer, along with a microphone and speakers, is to explore the physics of sound and the propagation of acoustic waves. The sound card and its use we have already described in the following post: Sound Card Applications. We now …

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Sound Card Applications

The Sound Card as a Tool for Analyzing Signals Modern sound cards designed for connection with a PC are sophisticated instruments that allow the acquisition in digital format (ADC conversion) of electrical signals on two channels. The standard sampling frequency is 44.1KHz (designed for an audio signal that reaches a …

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