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Using smartphone cameras and ambient light sensors in distance learning: the attenuation law as experimental determination of gamma correction
Physics Education Pub Date : 2021-04-29 , DOI: 10.1088/1361-6552/abf5b0
Pasquale Onorato 1 , Tommaso Rosi 1 , Eugenio Tufino 1 , Caterina Caprara 1 , Massimiliano Malgieri 2
Affiliation  

In times of the explosion of distance learning, because of emergency due to the pandemic, smartphone sensors and cameras are extremely valuable for teachers as they allow students to perform significant experimental activities in their own homes. The open-source software Tracker can be used in combination with the smartphone camera to perform measurements not only of mechanics activities, but also of optics. In the latter case, it is not always easy for students to understand how the pixel brightness which can be inferred from the taken photos are related to actual physical light intensity. In this paper we present a simple experiment to verify the exponential decay in the intensity of light going through successive sheets of a material (the Lambert law) with two different methods, i.e. using either the smartphone light sensor or the smartphone camera and Tracker. Besides its theoretical significance, the experiment constitutes a useful tool for calibrating the camera/Tracker combination to use it for different experiments.



中文翻译:

在远程学习中使用智能手机摄像头和环境光传感器:衰减定律作为伽马校正的实验测定

在远程学习爆炸式增长的时代,由于大流行导致的紧急情况,智能手机传感器和摄像头对教师来说非常有价值,因为它们允许学生在自己的家中进行重要的实验活动。开源软件 Tracker 可以与智能手机摄像头结合使用,不仅可以测量机械活动,还可以测量光学。在后一种情况下,学生并不总是容易理解可以从拍摄的照片中推断出的像素亮度与实际物理光强度的关系。在本文中,我们提出了一个简单的实验来验证通过连续材料层的光强度的指数衰减(朗伯定律),采用两种不同的方法,即 使用智能手机光传感器或智能手机摄像头和跟踪器。除了其理论意义外,该实验还构成了校准相机/跟踪器组合以将其用于不同实验的有用工具。

更新日期:2021-04-29
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