English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In order to investigate the speed of gravitational signals travelling in airor through a different medium two experiments were designed. One of theexperiments contains 2 masses rotating at very high speed and in the otherexperiment a sapphire bar will vibrate, in both cases they will emit a periodictidal gravitational signal and one sapphire device that behaves as a detector,which are suspended in vacuum and cooled down to 4.2 K will act as a detector.The vibrational amplitude of the sapphire detector device is measured by anmicrowave signal with ultralow phase-noise that uses resonance in thewhispering gallery modes inside the detector device. Sapphire has a quite highmechanical Q and electrical Q which implies a very narrow detection band thusreducing the detection sensitivity. A new detector shape for the detectordevice is presented in this work, yielding a detection band of about half ofthe device vibrational frequency. With the aid of a Finite Element Program thenormal mode frequencies of the detector can be calculated with high precision.The results show a similar expected sensitivity between the two experimentalsetup, but the experiment with the vibration masses is more stable in frequencythen it is chosen for the experimental setup to measure the speed of gravity inshort distances. Then a more precise analysis is made with this experimentreaching a signal-noise ratio of 10 at a frequency of 5000 Hz.

The Analysis of a Proposed Experiment to Measure the Speed of Gravity in Short Distances