2024-01-09
How to adjust the distance of photoelectric sensor? What is the working principle of the photoelectric sensor? This article will answer these two questions in detail.
Method for adjusting the sensing distance of photoelectric sensor:
1, increase the intensity of the light source, you can increase the sensing distance.
2, improve the sensitivity of the sensing device, the same can achieve the effect.
Photoelectric sensor working principle:
1. the modulation pulse generated by the oscillation circuit by the reflection circuit, and then the digital integral photoelectric sensor or RC integral way to exclude interference, and finally by the time-delayed (or non-time-delayed) trigger driver output photoelectric sensor control signal.
2. the use of optical components, in the middle of the propagation medium so that the light beam changes; the use of light beams to reflect the object; so that the light beam launched after a long distance and then return instantly. Optical switch is composed of three parts: transmitter, receiver and detection circuit. The transmitter is aimed at the target to launch the beam, the launch of the beam is generally derived from light-emitting diodes (LEDs) and laser diodes.
3. the beam is emitted uninterruptedly or the pulse width is changed. The radiation intensity of the beam modulated by the pulse is selected several times in the launch, running towards the target without indirection. The receiver has a photodiode or phototransistor composition. In front of the receiver, optical elements such as lenses and apertures are provided. Behind it is the detection circuit, which filters out the effective signal and applies the signal.
4. The modulating pulse generated by the oscillation circuit is reflected by the reflective circuit and then the light pulse is radiated by the light emitting tube GL. When the measured object enters the range of action of the light receiver, the light pulse that is reflected back into the photosensitive transistor DU.
5. photoelectric sensor and in the receiving circuit will be demodulated to the light pulse electrical pulse signal, and then amplified by the amplifier and synchronous selective shaping, and then the digital integral or RC integral way to exclude interference, and finally by the time-delayed (or not delayed) trigger driver output photoelectric sensor control signal.
6. photoelectric sensor generally have good return characteristics, so even if the detected object in a small range of shaking will not affect the output state of the driver, so that it can be maintained in a stable working area. At the same time, the self-diagnostic system can also display the light state and stable working area, in order to monitor the work of the photoelectric sensor at any time.
