photocells

Hi,

Welcome to our photocells (photoelectric) page.

   One of the most common types of detection sensors is the photoelectric sensor. These sensors receive information about objects by detecting the self-transmitted light reflected back by an infrared light. The most used format is that both the transmitter and receiver are in the same unit, but not all photoelectric sensors are made that way.

Photo-electric sensors are defined as = photocells. (at least in our country)


  

Photocells detect different objects with photo-optic signals. These objects can be metal or plastic, wood or glass, color or light. Photocells provide a wide range of services. At this point, it is possible to say "contactless detection" for the keyword.

   Photoelectric Sensors detect objects, changes in surface conditions, and other elements with a variety of optical properties.
Photoelectric Sensor primarily consists of an Emitter to emit light and a receiver to receive light. When the emitted light is interrupted or reflected by the sensing object, it changes the amount of light coming into the Receiver. The receiver detects this change and converts it into an electrical output. The light source for most Photoelectric Sensors is infrared or visible light (usually red or green/blue to identify colors).

   Photoelectric Sensors are classified as shown in the figure below.

Diffuse photocells: Used to detect the presence of objects or materials in a wide variety of industrial and manufacturing applications. The key to their operation is that they do not require physical contact with the detected target or object. That's why they are often called non-contact sensors.

Reflector photocells: In this type of sensors, a beam of light is sent from a transmitter and returned to the detector through a reflector. When the light beam can be reflected back, this object is recorded as absent. Non-reflective beam means that there is an obstacle that accepts as the presence of an object. These sensors have a longer range than diffuse types, but are easier to install and wire, and generally cost less than beam sensors.

Reciprocal sensors: This type of sensors consists of 2 separate devices, a transmitter and a receiver. The transmitter is usually directly in the line of sight of the emitter and sends a beam of light to the receiver. If the object to be detected refracts this light beam, it is perceived as an entity. This type of installation requires two components; A transmitter and a separate receiver, which makes installation and wiring a bit more complicated. However, its advantage is that it has the longest detection range and is the most accurate of detection methods.

Distance measuring photocells: These models, which generally work as a single device, are used to measure the distance between the point where the photocell is located and the object, depending on the rotation intensity and rotation speed of the signal they send to the relevant object. Although there are many types, there are models as digital output or analog signal output. Although their detection and sensitivities vary according to the product type, they are the models we encounter most often at 1mt/max levels.

Fiber optic photocells: They are sensing devices consisting of fibers that can carry optical light consisting of at least 2 elements together with a receiver and a transmitter, in narrow spaces, high temperature machines or moving environments. Optical fiber consists of core and cladding, which have different refractive indices. The light beam travels through the core, repeatedly bouncing off the wall of the cladding. The light beam, passing through the fiber without any loss in light quantity, is dispersed at an angle of about 60° and propagates to the target.

Ultrasonic photocell sensors: An ultrasonic sensor is an electronic device that measures the distance of the target object by emitting ultrasonic sound waves and converts the reflected sound into an electrical signal. Ultrasonic waves travel faster than the speed of audible sound (i.e. sound that humans can hear). Ultrasonic sensors have two main components: the transmitter (which radiates sound using piezoelectric crystals) and the receiver (which encounters sound after traveling to and from the destination). To calculate the distance between the sensor and the object, the sensor measures the time elapsed between the emission of sound by the transmitter to its contact with the receiver.

The formula for this calculation is D = ½ T x C (where D is distance, T is time, and C is speed of sound ~ 343 meters/second).

   + Supply voltages, output types, input types, operating models are explained in detail on each model's own page, and there are user manuals.

  + Note: Like all our products on our website, our Photocells are products for use in machines for the industrial automation sector. It has been produced with galvanic isolation for potential sources of interference, such as frequency drivers, power supplies, induction motors of various sizes, located in the same room.

---------


Refine Search