DEVELOPMENT OF A MICRO-CONTROLLER-BASED DIGITAL LOCK AMPLIFIER
The Lock-in amplifier is a great tool for measuring signals at levels below white noise levels and even intrinsic noise. It makes it possible to separate the signals in phase and in squaring, providing valuable information about the different physical magnitudes of the measured signals. Currently in the market there are several manufacturers that offer analog and digital locks, but none with national technology, which makes it difficult to acquire this type of instrument due to bureaucratic processes and high import costs. This work aims to develop a digital amplifier with a microcontroller-based lock for scientific instrumentation. To validate the application of the Lock-in amplifier, optoelectronic experiments were carried out to measure glucose concentration.