Tachyon scan

A tachyon scan, also known as a tachyon signal involved a starship emitting a tachyon beam at a particular location in an attempt to detect cloaked vessels by finding tachyon emissions given off by a cloaking device. Although a tachyon scan would detect most vessels using a cloaking device, its range was relatively limited but could be vastly increased by setting up a tachyon detection grid. This technique could also be used to scan quantum singularities. 

However, the Remans were able to remedy tachyon scans by developing a highly-advanced cloaking device that produced no tachyon emissions, rendering the user completely undetectable to all known scanning methods. Such a cloaking device was incorporated in to their massive wardbird, the Scimitar. 

Tachyonscan