An important function of the photoelectric switch is to be able to handle changes in the intensity of light: the light beam is changed by using optical components in the transmission medium; Use a beam of light to reflect objects; Instantaneously returns the light emitted by the beam over a long distance.
Photoelectric Sensor is an abbreviation of photoelectric proximity switch, which uses the occlusion or reflection of the light beam by the measured object to select the circuit to detect the presence of the object. Targets are not limited to metals, and all targets that reflect light can be detected. The electric switch converts the input current into an optical signal through the transmitter, and the receiver detects the intensity of the received light or the presence of a target object. Most photoelectric switches choose the infrared light wavetype, which is close to the wavelength of visible light. In general, photoelectric switches have good differential characteristics, so even if the detected object shakes in a small range, the output state of the driver will not be affected, so it can be maintained in a stable working area. In addition, the self-diagnosis system can also display the light receiving status in real time, stabilize the working area, and monitor the operation of the photoelectric switch at any time.
The types of photoelectric switches are as follows:
Through-beam photoelectric switches: consisting of two parts, transmitting and receiving, structurally separated from each other, when the beam is interrupted, a switching signal is shoveled, typically in the same axe, photoelectric switches can be separated from each other by up to 50 meters. Characteristics: Able to distinguish opaque reflective objects; The effective distance is large, because the beam only needs to pass through the sensing distance once; Not easily disturbed and can be used reliably and appropriately in the field or dusty environments; The device consumes a lot of power, and cables need to be laid at both poles.
Diffuse Photoelectric Switches: When the switch emits a beam, the target produces diffuse reflection, the transmitter and receiver form separate standard components, and when there is enough combined light to return to the receiver, the state of the switch will change, and the typical value of the operating distance will remain 3 meters. Characteristics: The effective range is determined by the reflective ability of the target, the surface characteristics and color of the target; In small combination switches consisting of a single element, coarse positioning is often possible; The background suppression feature is used to adjust the measurement distance; Sensitive to the dust of the target and sensitive to the reflective properties of the target change.
Specular photoelectric switch: composed of the transmitter and the receiver, it is a standard configuration, the beam emitted from the transmitter is reflected to the reflective end, that is, back to the receiver, when the beam is interrupted, the switching signal will change. The light passes through twice the duration of the signal and acts at an effective distance between 0.1 m and 20 m. Characteristics: Able to distinguish opaque objects; With the help of the mirror part, a high effective distance can be achieved; It is not easily disturbed and can be used reliably and appropriately in the field or in dusty environments.
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