German YILSAM DOKUM sensors, YILSAM DOKUM models, YILSAM DOKUM prices

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

YILSAM DOKUM sensor structure

It consists of two parts: the scale grating and the grating readhead. The figure on the right shows the structure of the grating scale. The key part of the grating detection device is the grating readhead, which comprises a light source, condenser lens, index grating, photoelectric elements, and adjustment mechanisms. There are many structural forms of grating readheads; based on their structural characteristics and application scenarios, they are classified into direct-reception readheads (also known as silicon photovoltaic cell readheads), mirror-image readheads, beam-splitter readheads, and metal grating reflection readheads.

YILSAM DOKUM sensor principle

The essence of grating displacement sensors is to perform measurement by using the grating pitch as a standard ruler. High-resolution grating scales are generally expensive and difficult to manufacture. To improve system resolution, Moiré fringes need to be subdivided; grating scale sensor systems mostly employ electronic subdivision methods. When two gratings overlap with a slight inclination angle, Moiré fringes are generated in a direction roughly perpendicular to the grating lines. As the grating moves, the Moiré fringes move up and down accordingly. This converts the measurement of grating pitch into the measurement of the number of Moiré fringes. Within the width of one Moiré fringe, placing 4 photoelectric devices at specific intervals enables electronic subdivision and direction determination. For example, for a grating scale with 50 line pairs per mm, the grating pitch is 0.02mm. With four-fold subdivision, counting pulses with a resolution of 5μm can be obtained, which achieves high precision in general industrial measurement and control. Since displacement is a vector, both its magnitude and direction must be detected; therefore, at least two photoelectric signals with different phases are required. To eliminate common-mode interference, DC components, and even harmonics, differential amplifiers composed of low-drift operational amplifiers are typically used. The 4 photoelectric signals obtained from 4 photosensitive devices are sent to the input terminals of 2 differential amplifiers. The two signals output from the differential amplifiers have a phase difference of π/2. To obtain direction determination and counting pulses, these two signals must first be shaped into square waves with a duty cycle of 1:1. Then, by comparing the phases of the square waves, the movement direction of the grating scale can be determined. By counting the square wave pulses, the displacement and speed of the grating scale can be obtained.

YILSAM DOKUM sensor usage precautions

Power off before plugging or unplugging the grating scale sensor and the digital readout connector. Install a protective cover whenever possible, promptly remove chips and oil splashed onto the scale, and strictly prevent any foreign matter from entering the grating scale sensor housing. Regularly check whether the mounting and connection screws are loose. To extend the service life of the dust-proof sealing strip, apply a thin, even layer of silicone oil to the sealing strip, taking care not to splash it onto the glass grating etched surface. To ensure reliable operation of the grating scale sensor, periodically clean and wipe the grating scale surface and the index grating surface with an ethanol mixture (50%) to keep the glass grating scale surface clean. The grating scale sensor must not be subjected to severe vibration or impact, as this may damage the grating scale; if the grating scale breaks, the grating scale sensor will fail. Do not disassemble the grating scale sensor yourself, and never arbitrarily change the relative spacing between the main grating and the secondary grating; otherwise, you may compromise the accuracy of the grating scale sensor and cause relative friction between the main and secondary gratings, damaging the chrome layer and thus the grating lines, which will render the grating scale unusable. Take care to prevent oil and water from contaminating the grating scale surface, as this can disrupt the distribution of the grating lines and cause measurement errors. Avoid operating the grating scale sensor in environments with severe corrosive effects, to prevent corrosion of the grating chrome layer and the grating scale surface, which would degrade the quality of the grating scale.

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