German CHOQUENET sensors CHOQUENET models CHOQUENET prices

CHOQUENET sensors are components that convert changes in non-electrical quantities (such as speed and pressure) into changes in electrical signals. Depending on the non-electrical quantity converted, they can be classified into pressure sensors, speed sensors, temperature sensors, etc., and serve as parts and accessories for measurement, control instruments, and equipment.

CHOQUENET sensor principle

Photoelectric sensors achieve control by converting changes in light intensity into changes in electrical signals. Generally, a photoelectric sensor consists of three parts: a transmitter, a receiver, and a detection circuit. The transmitter emits a beam of light toward the target. The emitted beam usually originates from semiconductor light sources, such as light-emitting diodes (LED), laser diodes, and infrared emitting diodes. The beam is emitted continuously, or the pulse width is modulated. 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, structural components of photoelectric switches include emitter plates and optical fibers.

CHOQUENET sensor classification

1) Slot-type photoelectric sensor: A slot-type photoelectric sensor is formed by mounting a light emitter and a receiver facing each other on opposite sides of a slot. The emitter emits infrared or visible light, which the receiver detects when unobstructed. When an object passes through the slot and blocks the light, the photoelectric switch activates, outputting a switching control signal to cut off or connect the load current, thereby completing a control action. Due to structural constraints, the sensing distance of slot-type switches is typically only a few centimeters. 2) Through-beam photoelectric sensor: Separating the emitter and receiver increases the sensing distance. A through-beam photoelectric switch consists of one emitter and one receiver, abbreviated as a through-beam photoelectric switch. The sensing 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 opposite sides of the object's path. When the object passes through and blocks the light path, the receiver activates and outputs 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. This setup uses the reflection principle to perform photoelectric control and is called a retro-reflective (or mirror-reflective) photoelectric switch. Under normal conditions, the light emitted by the emitter is reflected back by the reflector plate and received by the receiver. Once an object blocks the light path and the receiver no longer receives light, the photoelectric switch activates and outputs a switching control signal. 4) Diffuse-reflective photoelectric switch: The sensing 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 receiver does not detect the light emitted by the emitter. During detection, when an object passes through, it blocks the light and reflects part of it back to the receiver. The receiver then detects the light signal and outputs a switching signal.

CHOQUENET sensor application cases

1) Application of photoelectric sensors in laser weapons: Since photoelectric sensors are highly sensitive to infrared radiation, visible light, or both, they are more likely to become targets of laser attacks. Furthermore, electronic systems and the sensors themselves are highly susceptible to interference from thermal noise and electromagnetic noise generated by lasers, preventing normal operation. Methods of laser weapon attacks on photoelectric sensors on the battlefield mainly include the following: Using a laser beam of appropriate energy to "blind" the sensor, rendering it unable to detect or continue tracking already detected targets. Alternatively, if the sensor is guiding a weapon toward a target, blinding will cause it to lose the target. In summary, because sensors play an increasingly important role on the battlefield and are vulnerable to laser attacks, they have become the primary targets of low-energy laser weapons. 2) Application of photoelectric sensors in automatic meter reading systems: With the development of microelectronics, sensor technology, computer technology, and modern communications, photoelectric sensors can be used to develop automatic meter reading systems. The aluminum disk of an electricity meter rotates under torque generated by eddy currents and magnetic fields. Using a photoelectric sensor converts the number of rotations of the aluminum disk into pulse counts. For example, partially blackening a section of the rotating shiny aluminum disk and pairing it with a reflective photoelectric emitter-receiver pair generates pulses at the blackened section as the disk rotates. The rotation count is sampled and converted into corresponding pulse counts, then sent via an optocoupler isolation circuit to the T0 port of the CPU for counting processing. Using optocoupler isolators effectively prevents interference signals from entering the microcomputer. Combined with other transmission methods, this forms an automatic meter reading system. 3) Application of photoelectric sensors in monitoring smoke and dust pollution: A photoelectric sensor is a small electronic device that detects changes in received light intensity, achieving control functions by converting changes in light intensity into changes in electrical signals. Due to characteristics such as non-contact operation, fast response, and reliable performance, photoelectric sensors are widely used in industrial automation devices and robotics. We can utilize these characteristics to detect smoke and dust conditions; thus, the strength of the output signal from the photoelectric sensor reflects changes in flue gas turbidity. 4) Hygienic washdown-resistant photoelectric sensors: Washdown-resistant sensors provide extremely high reliability and ease of use while minimizing operating costs. Equipped with IO-Link interfaces and the proTect+ sealing concept, which significantly extends service life, these two new sensors are suitable for demanding applications and represent an ideal solution for the food and beverage industry.

Weidou Intelligent Technology specializes in selling German CHOQUENET sensors, CHOQUENET proximity sensors, CHOQUENET distance sensors, CHOQUENET vision sensors, CHOQUENET displacement sensors, CHOQUENET torque sensors, CHOQUENET speed sensors, CHOQUENET photoelectric sensors, CHOQUENET position sensors, CHOQUENET angle sensors, CHOQUENET tactile sensors, CHOQUENET temperature sensors, CHOQUENET pressure sensors, CHOQUENET flow sensors, CHOQUENET level sensors, CHOQUENET motion sensors, and CHOQUENET process sensors. All products are original imports from Germany. Customers are welcome to inquire and place orders.