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Hamamatsu Corp. - Earth Innovations LB 2/24

One Photon Per Pixel Produces 3-D Lidar Image

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With the detection of a single photon from each pixel location, a new lidarlike system can gauge depth and produce 3-D images. The technique is expected to be broadly applicable to microscopy and remote sensing. Lidar rangefinders are commonly used in applications such as surveying and autonomous vehicle control. The system gauges depth by emitting short bursts of laser light and measuring the time it takes for the reflected photons to arrive back and be detected. The new lidarlike system, developed at MIT's Research Laboratory of Electronics (RLE), requires 100 times less light...Read full article

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    Published: December 2013
    Glossary
    lidar
    Lidar, short for light detection and ranging, is a remote sensing technology that uses laser light to measure distances and generate precise, three-dimensional information about the shape and characteristics of objects and surfaces. Lidar systems typically consist of a laser scanner, a GPS receiver, and an inertial measurement unit (IMU), all integrated into a single system. Here is how lidar works: Laser emission: A laser emits laser pulses, often in the form of rapid and repetitive laser...
    photon
    A quantum of electromagnetic energy of a single mode; i.e., a single wavelength, direction and polarization. As a unit of energy, each photon equals hn, h being Planck's constant and n, the frequency of the propagating electromagnetic wave. The momentum of the photon in the direction of propagation is hn/c, c being the speed of light.
    pixel
    A pixel, short for "picture element," is the smallest controllable element of a digital image or display. It is a fundamental unit that represents a single point in a raster image, which is a grid of pixels arranged in rows and columns. Each pixel contains information about the color and brightness of a specific point in the image. Some points about pixels include: Color and intensity: In a colored image, each pixel typically consists of three color channels: red, green, and blue (RGB). The...
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