German PHD sensors PHD models PHD prices

PHD sensors are used to measure the robot's own position. Position sensors can be divided into two types: contact sensors and proximity sensors. Sensors that can sense the position of the measured object and convert it into a usable output signal. It can sense the position of the measured object and convert it into a usable output signal. Position sensors can be used to detect position, reflect switches in a certain state. Unlike displacement sensors, position sensors come in two types: contact and proximity.

PHD sensor principle

Photoelectric sensors achieve control by converting changes in light intensity into changes in electrical signals. Generally, photoelectric sensors consist of three parts: transmitter, receiver, and detection circuit. The transmitter emits a beam of light toward the target. The emitted beam usually comes from semiconductor light sources, such as light-emitting diodes (LED), laser diodes, and infrared emitting diodes. The beam is emitted continuously or with changed pulse width. The receiver consists of photodiodes, phototransistors, and photocells. Optical components such as lenses and apertures are installed in front of the receiver. Behind it is the detection circuit, which filters out valid signals and applies them. In addition, the structural components of photoelectric switches also include emitter plates and optical fibers.

PHD sensor classification

1) Slot-type photoelectric sensor: A slot-type photoelectric sensor is formed by mounting a light emitter and a receiver face-to-face on both sides of a slot. The emitter can emit infrared or visible light, and the light receiver can receive the light when there is no obstruction. However, when the detected object passes through the slot, the light is blocked, the photoelectric switch acts, outputs a switching control signal, cuts off or connects the load current, thereby completing a control action. The detection distance of slot switches is generally only a few centimeters due to the limitations of the overall structure. 2) Through-beam photoelectric sensor: If the emitter and receiver are separated, the detection distance can be increased. An emitter and a receiver form a through-beam separated photoelectric switch, referred to as a through-beam photoelectric switch. The detection distance of through-beam photoelectric switches can reach several meters or even tens of meters. When using a through-beam photoelectric switch, the emitter and receiver are installed on both sides of the path through which the detected object passes. When the detected object passes, it blocks the light path, and the receiver acts to output a switching control signal. 3) Retro-reflective photoelectric switch: The emitter and receiver are housed in the same unit, with a reflector plate installed in front. It uses the reflection principle to complete photoelectric control, called a retro-reflective (or mirror-reflective) photoelectric switch. Under normal conditions, the light source emitted by the emitter is reflected back by the reflector plate and received by the receiver; once the detected object blocks the light path and the receiver does not receive light, the photoelectric switch acts and outputs a switching control signal. 4) Diffuse-reflective photoelectric switch: The detection head of a diffuse-reflective photoelectric switch also contains an emitter and a receiver, but there is no reflector plate in front. Under normal conditions, the light emitted by the emitter cannot be found by the receiver. During detection, when the detected object passes, it blocks the light and partially reflects it back. The receiver then receives the light signal and outputs a switching signal.

PHD sensor application cases

1) Application of photoelectric sensors in laser weapons: Since photoelectric sensors are particularly sensitive to infrared radiation, visible light, or both, they are more likely to become targets of laser attacks. In addition, electronic systems and sensors themselves are extremely susceptible to interference from thermal noise and electromagnetic noise generated by lasers, making them unable to work properly. The main ways laser weapons on the battlefield attack photoelectric sensors are as follows: Using a laser beam of appropriate energy to "blind" the sensor, making it unable to detect or continue tracking already detected targets. Or, if the sensor is guiding a weapon to fly towards the target, blinding will cause it to lose the target. In summary, since sensors play an increasingly important role on the battlefield and are easily subject to laser attacks, they have become the preferred target for low-energy laser weapons. 2) Application of photoelectric sensors in automatic meter reading systems: With the development of microelectronics technology, sensor technology, computer technology, and modern communication technology, photoelectric sensors can be used to develop automatic meter reading systems. The aluminum disk of the electricity meter rotates driven by torque generated under the action of eddy currents and magnetic fields. Using photoelectric sensors can convert the number of rotations of the aluminum disk into pulse counts. For example: partially blackening the rotating shiny aluminum disk, paired with reflective photoelectric emitter-receiver pairs, generates pulses at the blackened areas when the aluminum disk rotates. The number of rotations of the aluminum disk is sampled and converted into corresponding pulse counts, and sent via optocoupler isolation circuits to the T0 port of the CPU for counting processing. Using optocoupler isolators can effectively prevent interference signals from entering the microcomputer. Combined with other transmission methods, an automatic meter reading system can be formed. 3) Application of photoelectric sensors in monitoring smoke and dust pollution: Photoelectric sensors are small electronic devices that can detect changes in received light intensity, achieving control functions by converting changes in light intensity into changes in electrical signals. Due to the non-contact, fast response, and reliable performance of photoelectric sensors, they are widely used in industrial automation devices and robots. We can use the characteristics of photoelectric sensors to detect smoke and dust conditions, so the strength of the output signal of the photoelectric sensor can reflect changes in flue gas turbidity. 4) Hygienic washdown-proof photoelectric sensors: Washdown-proof sensors provide extremely high reliability and comfort, minimizing operating costs. Equipped with IO-Link interfaces and the proTect+ sealing concept that significantly extends service life, these two new sensors are suitable for harsh application environments and are ideal solutions for the food and beverage industry.

Weidou Intelligent Technology specializes in selling German PHD sensors, PHD proximity sensors, PHD distance sensors, PHD vision sensors, PHD displacement sensors, PHD torque sensors, PHD speed sensors, PHD photoelectric sensors, PHD position sensors, PHD angle sensors, PHD tactile sensors, PHD temperature sensors, PHD pressure sensors, PHD flow sensors, PHD level sensors, PHD motion sensors, PHD process sensors. Original German imports. Welcome customers to inquire and order.