Infrared Detectors, Detector sensitivity, “the Jones Unit”

I came across this entry for your book on ResearchGate but it does not seem to be connected to your profile.

I am looking at infrared detector sensitivities to see which might be getting close to where they will pick up gravitational variations. Many new detectors now can pick up what is termed “Newtonian noise” which is the strong signals from earth based events, and tidal signals. The gold standard is still the superconducting gravimeter, but it is only single axis and 0.1 nanometer/second^2 at 1 sample per second.

MEMS, Bose Einstein, electrochemical, atom interferometer, electron interferometer, Mossbauer, atomic clock, atomic microscopy – many devices now can detect gravitational signals, but most are too expensive and not easily adapted.

I ran into a paper by Barbara Paola at Georgetown University, “Ambient Effect on PhotoGating in MoS2 Photodetectors.” I have been seeing more new work on photodetector arrays, but have not heard the unit, “Jones” before. I try to set standards for units and dimensions on the Internet. And I learn new things with each unit I find. I was trying to find more people using the “Jones” unit when I came across your book mentioned. Her paper is extremely interesting. Particularly figure 4, which shows changes in the Current Voltage curve of the devices as a function of state. I would normally call that photomodulation or something else, but the term “photoGating” is also useful.

Richard Collins, The Internet Foundation

Terahertz Imaging of cyclotron emission from quantum Hall conductors by Susumu Komiyama

Susumu Komiyama.

Thank you very much for sharing this paper. I am going through several of your papers now. I am fairly certain that some of these approaches can be adapted to detecting gravitational potential flows and fluctuations. I am going to try to put the detector sensitivities across all the frequencies into a common set of units. It is the different ways of counting that keep related methods apart.

The THz signals from gravitational events like earthquakes should be detectable. But at what sensitivity and frequencies and timings. If you go out and try to measure, you could take forever because you do not get know when the signal will happen. The Japan earthquake did register on the superconducting gravimeter and the broadband seismometer networks. But it also showed up as “magnetic” in other arrays. The only way to sort it out is to use time of flight correlation imaging.

With your cyblotron resonance method I might be able to show how the gravitational and THz detectors are related.

Richard Collins, The Internet Foundation

Novel Ultra-Sensitive Detectors in the 10–50 μm Wavelength Range by Susumu Komiyama

Richard K Collins

About: Richard K Collins

Director, The Internet Foundation Studying formation and optimized collaboration of global communities. Applying the Internet to solve global problems and build sustainable communities. Internet policies, standards and best practices.

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