Design of an Indigenised Electronic Lock-In Amplifier

Design of a Lock-in Amplifier with Current-Mode Oscillator

The lock-in amplifier can be used in instrumentation systems as a part of the conditioning circuit that optimizes and supports the signals coming from sensors, being capable of measuring the electrical impedance (or admittance) of such sensors, by exciting them with a local oscillator. In industrial environments and research laboratories, it is important to ensure that the level of current pass...

Using a Lock-In Amplifier

In this lab, we explore the principles of the use of a lock-in amplifier, using a He-Ne laser, light chopper, and a photodiode as the lock-in input. We explain and use the concepts of phase sensitive detection, dynamic reserve, and time constants to determine both the range of linearity of the photodiode in use, as well as the frequency response of the photodiode. Furthermore, we determine whet...

design of an analog fuzzy logic controller chip

fuzzy logic has been developed over the past three decades into a widely applied techinque in classification and control engineering. today fuzzy logic control is one of the most important applications of fuzzy set theory and specially fuzzy logic. there are two general approachs for using of fuzzy control, software and hardware. integrated circuits as a solution for hardware realization are us...

Lock - In Amplifier based on Virtual Instrumentation

When a slowly varying voltage is detected the main problem is the noise especially when it is several times greater than the signal itself. A lock-in amplifier is used to measure the small signals in presence of noise. The aim of this paper is to do a digital lock-in amplifier based on virtual instrument language LabVIEW and later on, it will replace a practice of a subject from the Physics’ de...

Design of an Instrumentation Amplifier