How many types of photoelectric switches are there? How to detect good and bad?

Date：2022-06-29 16:36:39Views：1018

From the perspective of information technology, photoelectric switch is a tool to obtain and convert information, which can be electricity, magnetism, light, sound, heat, force, displacement, etc. Sensitive element is the core component of sensor, which is used to sense external information and convert it into useful information. The same sensing element can form different application photoelectric switches due to different devices. How many types of photoelectric switches are there? How to detect good and bad? This article has collected and sorted out some materials, which are expected to be of great reference value to all readers.

In the sense of transformation, photoelectric switches can be roughly divided into two categories: the first category is to transform physical quantities into electric quantities, that is, the sensitive elements complete the transformation from physical quantities to electric quantities at one time; The second type is to convert physical quantities such as electricity, light, temperature, sound, displacement, pressure, etc. to each other, and then convert them into electricity, that is, after the sensitive element completes the conversion from one physical quantity to another physical quantity that is convenient for re conversion, then convert them into electricity by the conversion element.

From another point of view, photoelectric switches can also be divided into basic type and combined type. The basic photoelectric switch sensor converts basic physical quantities such as light, magnetism, temperature, pressure, gas and humidity into electricity; The combined photoelectric switch sensor uses the basic photoelectric switch to test other physical quantities. General combined photoelectric switches need secondary conversion or several basic converters to measure a physical quantity.

Method for detecting the quality of photoelectric switch

The common photoelectric switch has four pins, the second is the pin of the infrared light-emitting diode, and the second is the light receiving phototransistor. First, find out the two pins of infrared emission: since the four pins can be clearly separated, the two adjacent leads are a group,

With the resistance gear rx1k of the multimeter, the photoelectric switch is not affected by the forward and reverse resistance measurement method of light. It is easy to find the positive and negative resistance of only one set of lead, resulting in the infinite resistance of another group.

So you can set an infrared LED lead and forward resistance, the black pen is the cathode of the infrared emitter, and the reverse resistance leads to two. Is the opposite; The two wires irradiating the photoelectric switch with light are infinite group red rx1k. The size of the meter is a phototransistor,

The universal pen e wire is connected to the wire, and the black pen is connected to a wire. Then let the photoelectric switch see the light, and see the needle swing to the right. Then let the red and black pen, and then let the photoelectric switch see the light, and write down the correct size. The pointer has two tests, light or no light. The black pen with a large deflection of the pointer of the watch is connected to the collector of the photosensitive transistor, leaving a piece of lead as the photosensitive transistor.

If it can meet the above rules of photoelectric switch, it is good. If it is consistent with the above legal provisions, it is a bad photoelectric switch.