This document provides a quick introduction to the principles of lock-in amplification and explains the most important measurement settings. The lock-in detection technique is described both in the time and in the frequency domain.
23. Lock-in detection Lock-in detection is a technique for the detection of the amplitude and phase of a sinusoidal signal with a known frequency. Its distinctive advantage over other detection techniques is that it can selectively determine the amplitude and phase of a …
Nov 23, 2016 · http://www.zhinst.com/principles-of-lock-in-detection Learn about the principles of lock-in amplification, the most important measurement settings and the re
Author: Zurich Instruments
The Main Principles of Lock-in Detection. Precision AC voltage and AC phase meters, impedance spectroscopes, spectrum analyzers, network analyzers, noise measurement units, and phase detectors in phase-locked loops are some of the common applications of lock-in amplifiers. The fields of research consist of almost every length scale and temperature,
B. Phase sensitive detection. A lock-in, or phase-sensitive, amplifier is simply a fancy AC voltmeter. Along with the input, one supplies it with a periodic reference signal. The amplifier then responds only to the portion of the input signal that occurs at the reference frequency with a fixed phase relationship.
The LIA-ODS is a lock-in amplifier-based optical detection system that is ideal for fluorescence monitoring of analytes such as dissolved oxygen, chlorophyll, riboflavin and quinine. Other potential applications include measurement of weak IR absorptions and nephelometric turbidity.
The Phase Sensitive (Lock-in) Detector. The \lock-in ampli er” is an instrument used in many physics experiments because of its special e ectiveness in reducing noise in electrical measurements. But unlike instruments such as oscil- loscopes and various types of meters, its operating principle is …