Ads
related to: reflectors for photoelectric sensors for saleebay.com has been visited by 1M+ users in the past month
automationdirect.com has been visited by 10K+ users in the past month
balluff.com has been visited by 10K+ users in the past month
zoro.com has been visited by 100K+ users in the past month
Search results
Results from the WOW.Com Content Network
A photoelectric sensor is a device used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver. They are largely used in industrial manufacturing. There are three different useful types: opposed (through-beam), retro-reflective, and proximity-sensing (diffused).
Photodetectors, also called photosensors, are sensors of light or other electromagnetic radiation. [1] There are a wide variety of photodetectors which may be classified by mechanism of detection, such as photoelectric or photochemical effects, or by various performance metrics, such as spectral response.
A reflective type is typically formed on an opaque metal electrode base, where the light enters and the electrons exit from the same side. A variation is the double reflection type, where the metal base is mirror-like, causing light that passed through the photocathode without causing emission to be bounced back for a second try.
One category of presence sensing devices is Photoelectric Sensors. Light Curtains also fall into this category. Light curtains use many infrared light beams to form a perimeter around machinery. When two or more consecutively adjacent beams are interrupted, a kill-switch stops the machine until the boundary is reset.
A phototube or photoelectric cell is a type of gas-filled or vacuum tube that is sensitive to light. Such a tube is more correctly called a 'photoemissive cell' to distinguish it from photovoltaic or photoconductive cells. Phototubes were previously more widely used but are now replaced in many applications by solid state photodetectors.
The densitometer is basically a light source aimed at a photoelectric cell. [2] It determines the density of a sample placed between the light source and the photoelectric cell from differences in the readings. [3] Modern densitometers have the same components, but also have electronic integrated circuitry for better reading. [4]
Ads
related to: reflectors for photoelectric sensors for saleebay.com has been visited by 1M+ users in the past month
automationdirect.com has been visited by 10K+ users in the past month
balluff.com has been visited by 10K+ users in the past month
zoro.com has been visited by 100K+ users in the past month