NVS Flashcards
what are the 2 types of night vision devices available to crew members?
image intensifiers(I2), thermal imaging (FLIR)
what is the purpose of thermal imaging systems?
to provide an IR image of a scene by detecting heat
what is the advantage of thermal imagers over image intensifiers?
no light needed to operate the thermal imager
what atmospheric element affect the composition or density of the atmosphere and, therefore, affect IR signal transmission?
moisture, fog, dust, haze, smoke
what two factors create most of the parallax effect?
angular difference between the PNVS and the HDU, and the distance from the item being observed
what light spectrum does the image intensifier see?
What light spectrum does the thermal imaging system see?
visible and near IR
Far IR
What is IR crossover?
Phenomenon that occurs twice a day where the temp conditions cause a loss of contrast between adjacent objects
What is atmospheric condition?
When FLIR exceeds eye capability, “see” through obscurations
What is atmospheric transmission?
IR signal is affected by obscurations that affect air density (ie overcast, rain) causing poor quality FLIR image
What function does the M-PTUR receiver perform?
Converts infrared images to 16 analog outputs to the FLIR processor
What is the function of the M-PECA?
Amplifies azimuth and elevation commands and sends them to the drive motor to move the turret
What are the three types of BITs?
SBIT, CBIT, INIT (start up, continuous, initiated)
What is the function of the M-PAZD
Moves the turret to the commanded LOS
How many detector array output lines of video?
960 lines, video processor can only display 811, so there are 149 in reserve
What material is the mptur window/lens made of?
Geranium crystal
What conditions does the anti-ice turn on?
41 degrees F or 5 C, moisture in the air
Purpose of the video processor?
Collects video from FLIR, converts it to analog, and sends it to the correct source
The SBIT for PNVS & TADS starts when?
60sec after power on, takes 30 sec
What causes frozen video?
loss of video link communucations
What does loss of bus communications results in?
Affected turret will move to fixed forward in 5 sec