Measuring light with light-dependent resistors: an easy approach for optics experiments

Author(s)

Marinho, F. ^[1] ; Carvalho, C. M. ^[1] ; Apolinario, F. R. ^[1] ; Paulucci, L. ^[2]

Affiliation

^[1] Univ Fed Sao Carlos, Rodovia Anhanguera, Km 174, BR-13604900 Araras, SP - Brazil

^[2] Univ Fed Abc, Av Estados 5001, BR-09210170 Santo Andre, SP - Brazil

• Document type: Journal article
• Source: European Journal of Physics; v. 40, n. 3 MAY 2019.
• Web of Science Citations: 0

Abstract

We entertain the use of light-dependent resistors as a viable option as measuring sensors in optics laboratory experiments or classroom demonstrations. The main advantages of these devices are their essentially very low cost, easy handling and commercial availability, which can make them interesting for instructors with limited resources. Simple calibration procedures were developed indicating a precision of similar to 5% for illuminance measurements. Optical experiments were carried out as proof of feasibility for measurements of reflected and transmitted light and its quality results are presented. In particular, the sensor measurements allowed us to verify the angular distribution of a Lambertian reflective material, to observe transmitted and reflected specular light on a glass slab as function of the incoming angle of a light beam, and to estimate glass refractive index with values averaging 1.51 +/- 0.06 in satisfactory agreement with the expected 1.52 value. (AU)

• FAPESP's process: 17/13942-5 - Numerical characterization of the ARAPUCA: a new technology for detecting scintillation light in noble liquids
• Grantee: Laura Paulucci Marinho
• Support Opportunities: Regular Research Grants