German DGS DRUCKGUSS sensor, DGS DRUCKGUSS model, DGS DRUCKGUSS price

DGS DRUCKGUSS sensors are sensors that use laser technology for measurement. They consist of a laser, a laser detector, and a measuring circuit. Laser sensors are a new type of measuring instrument; their advantages include the ability to perform non-contact long-distance measurement, high speed, high precision, large measuring range, and strong resistance to optical and electrical interference.

DGS DRUCKGUSS sensor structure

It consists of two parts: the scale grating and the grating read head. The figure on the right shows the structure of the linear encoder. The key component of the grating detection device is the grating read head, which comprises a light source, a condensing lens, an index grating, photoelectric elements, and an adjustment mechanism. There are many structural forms of grating read heads. Based on the structural characteristics of the read head and the application scenarios, they are classified into direct-receiving read heads (also known as silicon photovoltaic cell read heads, mirror-image read heads, beam-splitter read heads, and metal grating reflective read heads).

DGS DRUCKGUSS sensor principle

The essence of a grating displacement sensor is to measure position using the grating pitch as a standard ruler. 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 use electronic subdivision methods. When two gratings overlap with a slight inclination, 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 the grating pitch into the measurement of the number of Moiré fringes. Within the width of one Moiré fringe, placing 4 photoelectric devices at certain intervals enables electronic subdivision and direction determination. For example, for a grating ruler with 50 line pairs/mm, the grating pitch is 0.02mm. If four-fold subdivision is used, counting pulses with a resolution of 5μm can be obtained, which achieves very 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, a differential amplifier composed of low-drift operational amplifiers is typically used. The 4 photoelectric signals obtained from 4 photosensitive devices are sent to the input terminals of 2 differential amplifiers respectively. 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 need to be shaped, first into square waves with a duty cycle of 1:1. Then, by comparing the phase 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.

DGS DRUCKGUSS sensor usage precautions

When plugging or unplugging the connector between the linear encoder sensor and the digital display unit, ensure the power is turned off. Install an external protective cover whenever possible, and promptly clean chips and oil splashed onto the scale to strictly prevent any foreign matter from entering the housing of the linear encoder sensor. Regularly check whether the mounting screws are loose. To extend the service life of the dust-proof sealing strip, apply a thin, uniform layer of silicone oil to the strip, taking care not to splash it onto the engraved surface of the glass grating. To ensure the reliability of the linear encoder sensor, clean and wipe the scale surface and the index grating surface at regular intervals with an ethanol mixture (50%) to keep the glass grating scale surface clean. The linear encoder sensor must not be subjected to severe vibration or impact, as this may damage the scale; if the scale breaks, the sensor will fail. Do not disassemble the linear encoder sensor yourself, and never arbitrarily change the relative gap between the main scale and the secondary scale. Otherwise, this may compromise the accuracy of the sensor and cause relative friction between the main and secondary scales, damaging the chrome layer and thus the grating lines, resulting in scrapping of the scale. Prevent oil stains and water from contaminating the scale surface to avoid disrupting the distribution of the grating lines, which would cause measurement errors. Avoid operating the linear encoder sensor in environments with severe corrosion to prevent corrosion of the chrome layer and the scale surface, which would degrade the quality of the scale.

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