This extension allows the technique to function on any set of binary data that has sufficient edges to provide information on the phase noise under evaluation.University of Washington.Ecker, Allan C.University o
A phase noise measurement module (PNMM), system and method for measuring phase noise improve accuracy of phase noise measurements of a signal under test (SUT) using a spectrum analyzer. The PNMM includes an RF to hF frequency converter and a selectable frequency divider. The system includes ...
A novel digital phase detection method is proposed for the high accuracy and large dynamic range interrogation of frequency-modulated continuous-wave (FMCW) interferometric fiber-optic displacement sensors. Firstly, a peak of beat signal is found coarsely, and the range of the peak is obtained. The...
This approach is similar to a traditional microwave frequency discriminator68, and allows sensitive noise measurements without the need for an external frequency reference. The phase noise measurement apparatus is sketched in Fig. 2a–b. Two copies of the microwave-photonic source are synthesized from...
10. The method of estimating phase noise spectral density in a periodic signal as recited in claim 8 wherein the interpolating step further comprises the step of generating a higher order interpolator using multiple digital data samples above and below the reference crossing. 11. The method of ...
Software-defined radios (SDRs) are radio frequency transceivers designed to facilitate digital signal processing through the use of vast libraries of open-source software. Here, we assemble a simple data acquisition system whose architecture, based on SD
The simplest phase-noise measurement method is the direct spectrum measurement using a spectrum analyzer. However, this method is only suitable for sources with relatively high noise because the phase noise of the spectrum analyzer must be significantly lower than the noise of the device under test...
Some researchers used FBG technology as a US detection method. FBG is another primary technology of fiber optic US detection technology. FBG is made by exposing the core of single-mode fiber to a periodic pattern of intense laser light laterally. Exposure increases the refractive index of the ...
The top and bottom membranes are attached to the MC layer, and the entire device is cured in an oven for another 4 h until complete. Electrical performance measurement The current signal of the device is measured by a current Stanford low-noise current preamplifier (model SR570) with the...
Turbulence is a complex and chaotic state of fluid motion. Atmospheric turbulence within the Earth’s atmosphere poses fundamental challenges for applications such as remote sensing, free-space optical communications and astronomical observation due to i