Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Newly designed exciter and receiver: (a) The newly designed exciter is used to generate pulse elastic waves. It has a height of 33 mm and a width of 25 mm. The mass of the steel ball is 16.95 g. It can be pulled up by the electromagnet and freefalls from a height of 8.3 mm when the electromagnet is released. (b) The receiver has a height of 5 mm, length of 22 mm, and width of 12 mm. A MEMS three axle accelerometer is inside.
