منابع مشابه
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...
متن کاملLock - 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...
متن کاملThe Lock-In Amplifier: Noise Reduction and Phase Sensitive Detection
To see how our Project Lock-In works, have a look at the Schematic I. You will find there the internal electronic components of the instrument and their interconnections. The most essential parts to make the Lock-In work as such, are a multiplier circuit and a low pass circuit, or integrator, which together form a “PhaseSensitive Detector", or PSD. For reasons you will immediately understand, a...
متن کاملCircular Regression in a Dual-Phase Lock-In Amplifier for Coherent Detection of Weak Signal
Lock-in amplification (LIA) is an effective approach for recovery of weak signal buried in noise. Determination of the input signal amplitude in a classical dual-phase LIA is based on incoherent detection which leads to a biased estimation at low signal-to-noise ratio. This article presents, for the first time to our knowledge, a new architecture of LIA involving phase estimation with a linear-...
متن کاملA basic lock-in amplifier experiment for the undergraduate laboratory
We describe a basic experiment for the undergraduate laboratory that demonstrates aspects of both the science and the art of precision electronic measurements. The essence of the experiment is to measure the resistance of a small length of brass wire to high accuracy using a simple voltage divider and a lock-in amplifier. By performing the measurement at different frequencies and different driv...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Review of Laser Engineering
سال: 2012
ISSN: 0387-0200,1349-6603
DOI: 10.2184/lsj.40.6_448