Yifumen IFM photoelectric sensor structure and classification description

The structure of Yifumen IFM photoelectric sensor:
The IFM photoelectric sensor is usually composed of three parts: transmitter, receiver and detection circuit.
The transmitter has a calibrated lens that focuses the light toward the receiver, and the receiver cable connects the unit to a vacuum tube amplifier. There is a small incandescent lamp in the metal cylinder as the light source. These small and sturdy incandescent lamp sensors are the prototype of today's photoelectric sensors.
The receiver is composed of a photodiode, a phototransistor and a photocell. Photodiodes are now the most common sensor. Photoelectric sensor photodiode has the same appearance as a general diode, except that its tube has a window embedded with glass to facilitate light injection. In order to increase the light receiving area, the area of the PN junction is made larger, and the photodiode works. In the reverse biased operating state, and in series with the load resistance, when there is no light, it is the same as the ordinary diode, the reverse current is very small, called the dark current of the photodiode; when there is light, the carrier is Excitation generates electron-holes called photocarriers.
In addition, the structural elements of the photosensor include a launching plate and an optical fiber. The corner reflector is a structurally sound emitting device that consists of a small triangular pyramidal reflective material that allows the beam to be accurately returned from the reflector. It can change the angle of emission from the range of 0 to 25 with the optical axis, so that the beam is almost returned from a line after it has been reflected.
Yifumen IFM photoelectric sensor type
(1) IFM slot type photoelectric sensor
Mounting a light emitter and a receiver face to face on either side of a slot is a trough optoelectronic. The illuminator emits infrared or visible light, and the optical receiver can receive light in an unobstructed condition. However, when the object to be detected passes through the slot, the light is blocked and the photoelectric switch operates. A switch control signal is output to cut or turn on the load current to complete a control action. The detection distance of the slot switch is usually only a few centimeters due to the limitation of the overall structure.
(2) IFM through-beam photoelectric sensor
If the illuminator and the illuminator are separated, the detection distance can be increased. A photoelectric switch composed of an illuminator and a light collector is called an off-beam split type photoelectric switch, and is simply referred to as an on-beam type photoelectric switch. Its detection range can be several meters or even tens of meters. In use, the illuminator and the light receiver are respectively mounted on both sides of the path of the detection object, and when the detection object passes, the light path is blocked, and the light receiver outputs a switch control signal.
(3) IFM reflector type photoelectric switch
A reflector-reflective (or mirror-reflective) photoelectric switch is installed in which the illuminator and the illuminator are housed in the same device, a reflector is placed in front of it, and the photoelectric control function is performed by the reflection principle. Under normal circumstances, the light emitted by the illuminator is reflected by the reflector and received by the light receiver; once the light path is blocked by the object, and the light receiver receives no light, the photoelectric switch operates to output a switch control signal.
(4) IFM diffuse reflection type photoelectric switch
Its detector head is also equipped with an illuminator and a light receiver, but there is no reflector in front. Under normal circumstances, the light collector emitted by the illuminator cannot be found. When the detected object passes through the light and reflects the light back, the light receiver receives a signal and outputs a switching signal.