Tools such as smoke turbidity monitor are very important to prevent some industrial smoke pollution. However, if the corresponding pollution of industrial smoke and dust is eliminated, the most important thing to be solved is to understand the smoke and dust emission. It is most important to detect and display the smoke source and give an alarm when it exceeds the standard. Because there is corresponding smoke turbidity in the flue, it can be detected by the change of light transmittance in the flue. Once the flue turbidity increases, we know that the light emitted by the light source will be affected by smoke particles. In this way, the light received by our photoelectric detector will be reduced, and the corresponding instruments will process it at this time.
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Application of bar code scanning pen. Once the scanning pen scans the bar code, the LED will be absorbed by the black line when it meets the black line. At this time, the phototransistor may not receive the corresponding reflected light, resulting in high impedance, thus making it in the off state. Once it meets the light emitted by white-spaced LEDs, it is reflected to the base of the corresponding phototransistor. The phototransistor will generate photocurrent to turn on, and when scanning the whole bar code, the bar code will be deformed into an electric pulse signal. Relevant instruments amplify and shape the signal to form a pulse sequence, which is then processed by the computer. In this way, the identification of bar code information can be completed.
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For the product counter, when the product runs through the conveyor belt, it will constantly block the corresponding light path from the corresponding light source to the photoelectric sensor. For photoelectric pulse, the corresponding circuit will generate electric pulse signal. When the passing product is blocked once, the photoelectric sensor circuit will generate a pulse. At this point, the number of output pulses is the number of products. The display circuit will display the corresponding counting circuit.
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For photoelectric smoke alarm, when there is no smoke, the light-emitting diode will let the light travel straight, and the phototransistor can't receive the signal at this time. When the smoke is heavy, the light emitted by the LED will be refracted, so that the triode will receive light, output signals and give an alarm.
There is also speed measurement. When the rotating shaft of a general motor (usually with black and white colors on it) rotates, reflected light and non-reflected light appear alternately. At this time, the photoelectric sensor intermittently receives the reflected light signal, thereby outputting an intermittent electrical signal. This signal will be amplified by amplifier and shaping circuit, and some square wave signals will be shaped and output. Finally, the motor speed will be displayed by the electronic digital display.
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I believe everyone knows the above case study, and the application of photoelectric sensors is like this. We can find that such products are widely used. These types introduced above are only a few aspects.
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