1. Photoelectric smoke alarm
When there is no smoke, the light emitted by the light-emitting diode travels in a straight line, and the phototriode does not receive a signal. There is no output, when there is smoke, the light emitted by the light-emitting diode is refracted by the smoke particles, so that the transistor receives the light, there is a signal output, and an alarm is issued.
2. Photoelectric tachometer
The rotating shaft of the motor is painted with black and white two colors, when rotating, the reflected light and the non-reflected light appear alternately, the photoelectric sensor receives the reflected signal of the light correspondingly intermittently, and outputs the intermittent electrical signal, and then amplifies the shaping output square wave signal through the amplifier and the shaping circuit, and finally outputs the speed of the motor by the electronic digital display.
3. Product counter
When the product runs on the conveyor belt, it constantly blocks the optical path from the light source to the photoelectric sensor, so that the photoelectric pulse circuit generates electrical pulse signals one by one. Every time the product is shading, the photoelectric sensor circuit generates a pulse signal, so the number of pulses output represents the number of products, which is counted by the counting circuit and displayed by the display circuit.
4. Photoelectric detection and automatic control
When photocells are used as photodetectors, their basic principles are the same as those of photodiodes, but their basic structures and manufacturing processes are not exactly the same. Since the photocell does not need an external voltage to work; It has been widely used in photoelectric readout, photoelectric coupling, grating ranging, laser collimation, film sound reproduction, ultraviolet light monitor and gas turbine flameout protection device.
5. Application of photoelectric sensors in automobiles
Photoelectric sensors can also provide a more comfortable display quality experience for cars, allowing automotive displays to be fully backlit in any ambient light.
Including in-car entertainment/navigation/DVD system backlight control, rear-seat entertainment display backlight control, instrument cluster backlight control (speedometer/tachometer), automatic rearview mirror brightness control, etc., can all be completed by light sensors.
In addition to the above applications, photoelectric sensors are also widely used in high-voltage and high-current measurement, relay protection, and smoke and dust turbidity monitoring.
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peculiarity
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