Photoelectric sensors are generally composed of three parts: transmitter, receiver and detection circuit, and its operating principle is to first convert the measured change into the change of the optical signal, and then convert the change of the optical signal into the change of the electrical signal (this part is called the "photoelectric effect"). According to the different detection methods, photoelectric sensors can generally be divided into diffuse reflection type, reflective plate type and through-beam type.
According to the different detection functions, photoelectric sensors can also be divided into general photoelectric switches, fork photoelectric switches, gratings, laser ranging, optical communications, color mark sensors, optical fiber sensors, safety photoelectric switches, etc. With many years of experience in the field of photoelectric sensors, we are not only a leader in the wide range of products, but also in terms of technological innovation.
The photoelectric sensor consists of three parts: a transmitter, an acceptor and a detection circuit. Among them, the receiver is the component that completes the photoelectric effect, and its function is to convert the optical signal into an electrical signal. As for general photoelectric sensors, are they all the same? First, let's take a brief look at SPT's Single Pix Technology, a single receiver, such as a photodiode. In the absence of light during normal operation, the photodiode produces only a small saturation reverse leakage current, i.e., dark current. When there is illumination, the saturation reverse leakage current increases greatly, constituting the photocurrent, which changes with the change of incident light intensity. Generally speaking, the general diffuse reflective type, reflective plate type, thru-beam type and fork type photoelectric are planned according to SPT.
Let's take a look at the set press type with the best skills, more set press types on the market use DPT dual pixel technology (Dural Pixel technology), dual receivers, such as Figure N (Near) near receiver and F (Far) far receiver. The sensor compares the light intensity of the two receivers, and when the light intensity of the proximal receiver is higher than that of the far end, the switch function is triggered, that is, the target object is detected in the detection area.
The above two receivers complete the function of setting pressing, which we also call mechanical setting pressing, and how is the corresponding electrical setting pressing completed? MPT Multi Pixel Technology, whose receiver is composed of an array of photodiodes. By investigating the change in the angle of the reflected light and the position of the spot on the receiver, it is possible to accurately measure the distance from the target to the sensor. The MPT skill chip that has been independently planned by the company can not only complete the first-class set pressing function, but also complete the short-distance function. For example, the OMT50-R100 product of the R100 series can achieve a repeatability of 0.1mm.
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