This forum uses cookies
This forum makes use of cookies to store your login information if you are registered, and your last visit if you are not. Cookies are small text documents stored on your computer; the cookies set by this forum can only be used on this website and pose no security risk. Cookies on this forum also track the specific topics you have read and when you last read them. Please confirm whether you accept or reject these cookies being set.

A cookie will be stored in your browser regardless of choice to prevent you being asked this question again. You will be able to change your cookie settings at any time using the link in the footer.

Malus’ law using SensorTag
The idea to use smartphone for measuring the light intensity passing trough 2  polarizers as cos² of the angle between their axes (Malus’ law) is not new. See, for example, Martín Monteiro, Cecilia Stari, Cecilia Cabeza, and Arturo C. Martí, "The Polarization of Light and Malus’ Law Using Smartphones," The Physics Teacher 55, 264 (2017); doi: 10.1119/1.4981030 . But not all telephones have a light sensor Idea . So, here is an experiment using the SensorTag of Texas Instruments controlled by a smartphone via Bluetooth. The corresponding phyphox program is attached here. The angle of rotation is determined from x and y components given by the SensorTag acceleration sensor. It is much easier to rotate the SensorTag than a smartphone. One polarizer film  is in front of the light source and another is attached to the SensorTag.

There is a little problem of synchronization of two sensors Confused . It is not sufficient to use the same interval of measurements (0.8 s)...

Attached Files Thumbnail(s)

.phyphox   Light Intenity and orientation(accelerometers).phyphox (Size: 8.19 KB / Downloads: 150)

Messages In This Thread
Malus’ law using SensorTag - by solid - 12-13-2020, 01:04 AM
RE: Malus’ law using SensorTag - by solid - 12-13-2020, 07:55 AM
RE: Malus’ law using SensorTag - by solid - 12-14-2020, 05:59 PM
RE: Malus’ law using SensorTag - by solid - 12-14-2020, 08:26 PM
RE: Malus’ law using SensorTag - by solid - 12-14-2020, 09:28 PM

Forum Jump: