A popular series of inexpensivedistance sensors integrates aninfrared emitting diode, a linearcharge-coupled-device array, and asignal-processing circuit in one unit.The output is a dc voltage, V S, ...

I’m working on a project involving the need to precisely move a tool based on the measured distance to an object. Okay, yeah, it’s a CNC mill. Anyway, I’d heard of time of fight sensors and decided to ...

Light-based proximity sensors for use in robots and 3D printers must not be fooled by transparent or black surfaces, says Gabriele Fulco A surprising number of systems depend on the ability to ...

Sensors for the measurement of displacement based on a number of different physical principles are available for a wide range of applications. This article considers systems capable of resolutions of ...

Analog and digital optoelectronic sensors combine an LED and an optoelectronic integrated circuit in a compact package to enable optical encoders to provide absolute or incremental position detection ...

Figure 1a shows a slotted optical switch. An LED is mounted in a plastic housing, facing a phototransistor, but separated by a gap. If something moves into the gap, it blocks the light path between ...