German Elap srl sensors, Elap srl models, Elap srl prices

Elap srl 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., serving as parts and accessories for measurement and control instruments and equipment.

Elap srl sensor structure

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

Elap srl sensor principle

The essence of a grating displacement sensor is to measure position using the grating pitch as a standard scale. High-resolution grating rulers are generally expensive and difficult to manufacture. To improve system resolution, Moiré fringes need to be subdivided; grating ruler 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 ruler with 50 line pairs/mm, the grating pitch is 0.02mm. With four-fold subdivision, counting pulses with a resolution of 5μm can be obtained, achieving high precision in general industrial measurement and control. Since displacement is a vector, both its magnitude and direction must be detected, requiring at least two photoelectric signals with different phases. 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 amplifier 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 ruler can be determined. By counting the square wave pulses, the displacement and speed of the grating ruler can be obtained.

Elap srl sensor usage precautions

When plugging or unplugging the connector between the grating ruler sensor and the digital display unit, ensure the power is turned off. Add protective covers whenever possible, and promptly clean chips and oil splashed onto the ruler to strictly prevent any foreign matter from entering the grating ruler sensor housing. Regularly check whether installation screws are loose. To extend the life of the dust-proof sealing strip, apply a thin, uniform layer of silicone oil to it, taking care not to splash it onto the glass grating engraved surface. To ensure the reliability of the grating ruler sensor, clean and wipe the grating ruler surface and index grating surface periodically with an ethanol mixture (each 50%) to keep the glass grating ruler surface clean. Grating ruler sensors are strictly prohibited from severe vibration or impact to avoid damaging the grating ruler; if the grating ruler breaks, the sensor becomes invalid. Do not disassemble the grating ruler sensor yourself, and never arbitrarily change the relative gap between the main grating and the secondary grating. Otherwise, this may damage the sensor's precision and cause relative friction between the main and secondary gratings, damaging the chrome layer and thus the grating lines, rendering the grating ruler scrap. Prevent oil and water contamination of the grating ruler surface to avoid disrupting the grating line distribution and causing measurement errors. Avoid operating grating ruler sensors in environments with severe corrosion to prevent corrosion of the grating chrome layer and surface, which would compromise quality.

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