Dear members
To thsoe who are involved in silicon accelerometers, I would like to ask
questions. Silicon accelerometers are usually soldered on the PC-board.
Once it is soldered, it is impossibel to remove.
1) what sort of connecting method is used for the calibration or
characterization ?
2) Can you clearly define the difference between soldering and other
connection method ?
3) In the papers presented at conferences, such as transducers etc, people
present results of calculation, modeling, experiment of seismic systems made
of silicon only. However, they are installed in the packaging and fixed by
some method. Is the dynamic response calcuation carried out under the
consideration on the casing dynamic, connetinig method and the transfer
response ?
4) How do they guarantee the qualities ? what sort of testing is used and
how is effectiveness is verified ?
5) what is the standard in  the production of silicon accelerometers ?
There is no reference silicon accelerometers like conventional
accelerometers ?
6) In the application to air bag inflation control, transmission of
deformation of passenger room and the car body is the first thing to be
detected. What sort of logic is the most reasonable one for the control.
This might request the accurate estimation on the transmission process of
impact to detecting accelerometers. It this reasonably done in the real
development situations ?
As a scientist working at metrology laboratory, I am looking forward to  the
response.
Yours
Akira Umeda
National Research Laboratory of Metrology