Sensor
From SGCommand
Sensors are devices capable of detecting a variety of objects and activity, which vary between races.
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[edit] Ancient
[edit] Long-range
Ancient Long range sensors were used on ships to detect other vessels and planets.
The Long range sensors on city-ships can scan massive distances, at least a quarter of a galaxy, and are one of the few ones known to be able to detect ships in hyperspace. Less advanced versions were installed on Aurora class warships and other vessels of similar status that have a shorter range. They are very similar to Asgard sensors.
[edit] Short-range
Short range sensors scan in much more detail, but at a far shorter range.
City ships possess sensors that can scan all life forms on a planet's surface (and probably in orbit over the city,) and identify them. They can also create visual images based on the sensor data, which even the Asgard have not accomplished, although this has only been seen done through a Control chair as it may require the users mind to interpret some details in a similar way to the VR chairs on P7J-989. The chair also appears to input the sound into the users mind as the Lord Protector of The Tower claimed to know what the Atlantis team was saying even though no sound was playing. (ATL: "The Tower")
Ancient Life signs detectors can identify solid objects, life forms, and energy sources. They can also scan for the Ancient Gene and possess the ability to scan underground in the same radius as the size of Atlantis (ATL: "The Tower")
[edit] Asgard
Asgard sensors are highly advanced. They can scan through Goa'uld shields and pinpoint life signs from far away. They are also what allows their beaming technology to lock on to an object so accurately. A (likely less advanced) version of this technology was installed on the Earth ships of the Daedalus-class, although it would have been upgraded to the most advanced version as part of the Asgard legacy. (SG1: "Unending")
[edit] Tau'ri
While the Tau'ri do have sensor technology of their own (radar, etc.) they mostly rely on a less advanced form of Asgard sensor technology. Such sensors are located on Daedalus-class ships at the top-rear port section of the ship. They are used for detecting life signs, locator beacons, as well as other ships in space. However, after the Tau'ri received all of the knowledge of the Asgard, it is possible that they have updated their ships with a more advanced version of Asgard sensors, and maybe even applied information found in the Atlantis database as well.
