active illumination

active illumination

[′ak·tiv ə‚lüm·ə′nā·shən]
(engineering)
Lighting whose direction, intensity, and pattern are controlled by commands or signals.
References in periodicals archive ?
The most significant features are: new active illumination focus variation developed for measuring the shape of large rough surfaces; new thin film measurement technique, which allows the user to measure the thickness of optically transparent layers quickly, accurately, non-destructively and with no sample preparation; and differential interference contrast has been added to emphasise very small height features.
Unlike the active illumination of Lidar and radar systems, camera systems are passive and to detect objects at night requires very detailed low light sensors.
Now the Mepro MOR offers both passive and active illumination and two aligned targeting lasers, one infrared for use with night vision gear and one visible.