AECO-Photoelectric Sensors-Cảm biến quang-Tiêu chuẩn kỹ thuật

 PHOTOELECTRIC SENSORS FT SERIES

WORKING PRINCIPLE

These electronic devices, photoelectric sensors or photocells, use the light emission principle combined with the electronic and are made up of an emitter or luminous source, the light rays of which are detected by a receiver

The variation in luminous signal, obtained when interrupting this ray, is converted into an electrical signal and is measured and used by an electrical circuit.

The light used is either infrared or red. By making use of this light various type of photoelectric sensors can be made.

The AECO photoelectric sensors available the FT18 and FTQSP series in direct reflection, with reflector with polarized light and emitter-receiver versions. Due to their flexibility regarding the various standard programmable versions these products offer the possibility of stocking reduction and are easily interchangeable with most of the units available on the market. They are used in the field of automation to check for the presence, counting, position control, etc., and they are compatible with most logic programmers.

TYPE OF SENSING

DIRECT REFLECTION (P TYPE)

In this type of function the emitter of the infrared light and the receiver are close together. The sensing is obtained by the reflection of the rays from the object. In the use of these photocells it is important to bear in mind the colour and the type of surface of the object. With opaque surfaces the sensing distance is affected by the colour of the object, light colours correspond to the maximum distances and vice versa. In the case of shiny objects the effect of the surface is more important than the colour. The sensing distance in the technical data is related to matt white paper.

REFLECTION WITH REFLECTOR (R TYPE)

This type also has the emitter and receiver close together.

The reflection of the light emitted is obtained by using one or more reflectors and the sensing of the object occurs when these rays are interrupted. These photocells allow longer sensing distances as the rays emitted are almost totally reflected towards the receiver.

REFLECTION WITH REFLECTOR – POLARIZED LIGHT (AR TYPE)

Similar to the R type, these photocells use an antireflex device, the use of such a device, which bases its functioning on a polarized band of light, offers considerable advantages and secure readings even when the object to be sensed has a very shiny surface.

They are not in the technical data afected by random reflections.

THRU BEAM EMITTER-RECEIVER (B TYPE)
In this type of function the emitter and receiver of infra-red light face each other. Sensing is achieved when this barrier of light is interrupted, they have a high reception as there is no dispersion between emitter and receiver. These photocells are therefore used for large distances where a high security of functioning is required. M18 types are supplyable with shutter of various diameters to be screwed on to optic part of both photoelectric sensors. This accessory permits detection of small objects in precision detecting applications.