Based on stochastic parallel gradient descent (SPGD) control algorithm, an adaptive optics test-bed without a wave-front sensor was built with a 32-element deformable mirror and a CCD.

基于随机并行梯度下降（SPGD）算法，32单元变形镜，CCD成像器件等建立了无波前传感自适应光学系统实验平台。

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The Virginia Tech team put a laser sensor on the front of the car to look for activity in nearby areas.

VOA: special.2009.11.03

An operator even miles away in front of the PrimeSense sensor could move his body and his arms naturally, while the robot reproduced exactly the same movements.

ENGADGET: SAMI robot has motion detection from the company behind Kinect's 3D sensors, washboard abs (video)

To use the set, you sit in front of a black rectangular sensor positioned at chest height.

ENGADGET: Haier's Eye-Control TV set, we go eyeballs on (video) HD

In addition, the Optical Picture (OPC) feature helps save power by using a sensor on the front of the TV to detect ambient room light, and automatically adjusts TV brightness for the best picture.

ENGADGET: Sharp announces new 6-, 7- and 8-Series AQUOS LED TVs as part of 2013 lineup (update: pricing info)