The paper reviews modern gravimeters of aviation gravimetric systems, their design and principle operation. Their advantages disadvantages, features functioning processing the received data are analyzed. It is shown that high-precision measurements gravitational acceleration (g) extremely relevant necessary for many fields science technology. main characteristics known given. has been establish...

BACKGROUND Portable direct-reading instruments by light-scattering method are increasingly used in airborne fine particulate matter (PM2.5) monitoring. However, there are limited calibration studies on such instruments by applying the gravimetric method as reference method in field tests. METHODS An 8-month sampling was performed and 96 pairs of PM2.5 data by both the gravimetric method and t...