Comment on Endaq Steve Hanly blog about accelerometer sensitivity
Accelerometer Specifications: Deciphering an Accelerometer’s Datasheet by Steve Hanly
I see you mention temperature sensitivity. I am writing an article on gravimeters and recommending different ones. Someone estimated their response to temperature. It can be estimated for gravimeter arrays. Here is how I estimated it.
Relation between gravity, magnetism and temperature at the earths surface
I have spent many years calibrating gravimeter arrays. I am trying to encourage the development of three axis, time of flight gravimeter for earthquake early warning, tracking and imaging the atmosphere (constraints on the climate models, and real time monitoring), imaging ocean currents, imaging earth interior. But the current developers are slow and don’t have the skills to use fast ADCs, low latency raw data handling, correlation networks and global sharing for algorithm development that is needed for that to happen.
I cannot do everything, but I try to gather and encourage. www.GravityNotes.Org has some of the technologies for earthquake early warning. The Japan earthquake registered as a speed of light and gravity signal in the superconducting gravimeter network and in the broadband seismometer network. I tried to encourage development of low cost gravimeters for global arrays. That is at https://hackaday.io/project/164550-low-cost-time-of-flight-gravimeter-arrays. I routinely review all the new designs and paper for big G experiments, many “quantum” experiments that are sensitive enough to measure accelerations in the nanometer per second squared (nm/s2) and pm/s2 range.
If there are people interested in this, I can share what I have found. The vibration sensors are getting into the Gsps range and they can be used for coarse grained time of flight imaging. It would be good to have them look at the whole worlds gravity, not just machine vibrations. Most of the methods for vibration measurement are also used for gravimeters. There are MEMS gravimeters, atom interferometer gravimeters, photon interferometer gravimeters, atomic force gravimeters, electron interferometer gravimeters, Bose Einstein gravimeters. I am too tired to list them all in a note.
Richard Collins, Director, The Internet Foundation