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Description Générale

The objective of this module is to show some of the techniques used to measure light or illumination intensity.

The module is equipped with a lamp whose light intensity can be controlled by the variation of the voltage supplied.

This module has:

  • Lamp.
  • Photodiode.
  • Phototransistor.
  • Light Dependent Resistance (LDR).
  • Photovoltaic Cell.
  • Infrared emitter-receiver.

All the connections from the different transducers and the lamp are made using a group of 2 mm. terminals placed on the front panel of the test module with drawings describing their functions.

Des exercices et pratiques guidées

EXERCICES GUIDÉS INCLUS DANS LE MANUEL

  1. Study of the equivalent electrical circuit of a photodiode. Studythe V-I characteristic of a photodiode.
Study of the normal operation mode of a photodiode. Study the"ON/OFF" operation (light switch) of a phototransistor.
  1. Measurement of light intensity using a solar cell.
Study of the properties of light dependent resistors (LDR).
  1. Study of the operation of IR sensors.
  2. Study of a real application for controlling the light intensity usingPID control elements.

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