Internal sensor Internal sensors were sensor s aboard starship s and starbase s that were used to scan for various things , including life sign s , inside the vessel or structure . They performed such functions as locating various crewmembers via combadge s and detecting intruders . Internal sensors were used to locate an intruder during an intruder alert situation . In 2151 , the unidentified aliens placed a device on board " Enterprise " which was tapped into most of the ship ' s systems , including internal sensors and communications on all decks . ( ) In September 2152 , Commander Tucker accessed the internal sensors aboard " Enterprise " from a monitor in T ' Pol ' s quarters to have a closer look at the intruders from the Takret Militia on the bridge . ( ) In 2154 , Lieutenant Reed used the internal sensors of the to locate the Vulcan bio - signs of Soval but was unable to find him on board . ( ) " In 2155 in the mirror universe , disabled the internal sensors on the to aid in her attempt to free Captain Maximilian Forrest following ' s mutiny . " ( ) The internal sensors of a starship were unable to detect 15 , 525 known physical substances , including 532 substances which could exist in an oxygen atmosphere . ( ) When the traveled back in time due to the actions of Arne Darvin , who wanted to kill James T . Kirk , Captain Sisko and the others used the internal sensors of the to scan for explosive s . ( ) The internal sensors were used to locate Wesley Crusher when he was the only crewmember , besides Data , unharmed by the game Riker brought back from Risa . The sensors were able to locate him , despite him not having his combadge on , by registering him as an unidentified heat source . ( ) When strange sensor malfunctions began to appear on the in 2368 , Commander Riker ordered a level 3 diagnostic of the entire internal sensor network . ( ) Chief Miles O ' Brien called the internal sensors aboard Deep Space 9 " bloody Cardassian internal sensors " because they were not sensitive enough . A recalibration of these sensors would take days . ( ) In 2370 , while talking to Worf in Ten Forward , Ensign Sito Jaxa mentioned that among her duties at ops was to find a lost puppy and that she used the internal sensors for this task . ( ) That same year , when Doctor Julian Bashir was trapped in a version of Deep Space 9 created by his own mind , he wanted to find a computer processing junction so that O ' Brien could repair the station ' s internal sensors . According to O ' Brien , the entire sensor array was burned out . ( ) In 2372 , a mutated Tom Paris caused a power outage on board the after firing a phaser at a port plasma conduit . Commander Chakotay reported to Captain Kathryn Janeway that he couldn ' t get power to the internal sensors . ( ) When the Borg took over control of deck 16 aboard the , the crew lost the internal sensors as well as the environmental control s . ( ) In 2373 , when Captain Kathryn Janeway and Neelix found " Voyager " adrift after returning from a three - day trade mission with the Tak Tak , Janeway tried to access the ship ' s internal sensors , but found that the main computer was offline . ( ) The internal sensors of Deep Space 9 were able to monitor levels of chroniton buildup during an explosive confrontation between a Prophet ( in the body of Kira Nerys ) and a Pah - wraith ( in the body of Jake Sisko ) in 2374 . ( ) In Lieutenant Tuvok ' s " Insurrection Alpha " holoprogram , the internal sensors were part of a code involving a Maquis mutiny on the USS " Voyager " . As part of the program , Commander Chakotay would ask the participant in the program if they had finished upgrading the internal sensors . If the participant replied in the affirmative , it was supposed to actually indicate that they had placed all crew quarters on lock - down . ( ) In 2376 , when Seven of Nine presented her theory regarding a conspiracy on - board the USS " Voyager " to Commander Chakotay and later Captain Kathryn Janeway , she first sealed the doors and then disabled the internal sensors within astrometrics . ( )