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...in portable products. As a result, the use of an ambient light sensor (ALS) to optimize the operation of the backlight LEDs under a variety of environmental lighting situations is increasing while, at the same time, the preferred technology choices available to designers for sensing have shifted towards...

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Alternating Current (AC) powered light sources have variations in light output. This variation or flicker may affect a light sensor's output, which creates unwanted variations in light measurements unless appropriate techniques are used to filter out the flicker....

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Safety light curtains play an important role in many machine-safety strategies. Light curtains consist of two linear arrays of through-beam optical sensors commonly referred to as light bars. Only one bar actually holds a light source. Its LEDs send a number of infrared beams across the gap between...

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...and demonstrate dramatic improvements in quality control to obtain a new project contract. They selected Omron to design and install a poka-yoke system based on pick-to-light sensors. The popular Japanese mistake-proofing method called "poka-yoke" gives an assembler the opportunity to correct an error...

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All photoelectric sensors use a light source to signal the presence or absence of an object. There are three basic methods of photoelectric sensing. All sensors have a light source or transmitter (TX) and a light detector or receiver (RX). Both thru-beam and retroreflective sensors are usually...

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The Microspot through-beam sensor from STM has a sensing head 2 mm in diameter. Designed for tight mounting spaces, it can sense objects down to 0.05 mm. Conventional LEDs are constructed with an electrode in the middle of the light-emitting surface, producing a dark spot in the center of the beam...

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...magnification is obtained by dividing the field of view by sensor size. A dual-magnification imaging system with in-line laser illumination is used in wire-bonding inspection. A single lens routes light through two cameras to generate the high-magnification image on the top screen...

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...paving the way for powerful chemical sensors and laboratory instruments. Key to the technology is a new coating technique that enables the mesh to capture and transmit more light through its microscopic holes than would normally be possible. e, and his colleagues also found that if they coated...

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The sensor membrane is made from silicon nitride, 100 to 300 nm thick. Deposited on the membrane are tiny heating elements and temperature sensors. The light-absorbing housing is molded from ABS and the optically transparent cover from PMMA. A 1-mm-wide weld line gives the gastight cover the required...

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Photo sensors bridge the gap between light and electronics. Microchip's Programmable Gain Amplifiers (PGAs) are not well suited for precision applications (such as CT scanners), but they can be effectively used in position photo sensing applications minus the headaches of amplifier stability. When...

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