Frequency analyser: A new Android application for high precision frequency measurement

Frequency analyser: A new Android application for high precision frequency measurement

We present Frequency Analyser, an Android TM application for measuring the fundamental frequency of a sound wave with very high precision in a frequency range between 100 Hz and 11 kHz. The application allows exporting the data of frequency as a function of time to an ASCII file. Several examples of application to Physics and Engineering teaching experiments are presented.

A New High Frequency Grid Impedance Estimation Technique for the Frequency Range of 2 to150 kHz

Grid impedance estimation is used in many power system applications such as grid connected renewable energy systems and power quality analysis of smart grids. The grid impedance estimation techniques based on signal injection uses Ohm’s law for the estimation. In these methods, one or several signal(s) is (are) injected to Point of Common Coupling (PCC). Then the current through and voltage of ...

6 High - Precision Frequency Measurement Using Digital Signal Processing

High-precision Absolute Distance Measurement using Frequency Scanned Interferometry

In this letter, we report high-precision absolute differential distance measurements performed with frequency scanned interferometry (FSI). Absolute differential distance was determined by counting the interference fringes produced while scanning the laser frequency. A high-finesse Fabry-Perot interferometer was used to determine frequency changes during scanning. Two new multi-distance-measure...

High-Precision Frequency Measurement Using Digital Signal Processing

High-precision frequency measurement techniques are important in any branch of science and technology such as radio astronomy, high-speed digital communications, and highprecision time synchronization. At present, the frequency stability of some of atomic oscillators is approximately 1E-16 at 1 second and there is no sufficient instrument to measure it (C. A. Greenhall, 2007). Kinds of oscillat...